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# KVPY 2016 interview

First of all congrats to all those who have been selected for the interview.Its indeed a great achievement as lot many appear in this prestigious exam .So we have abt 1-2 months left for the interview.So you guys can give suggestions on the interview like which subject to choose,questions related to that etc.I welcome suggestions from you all.From my school we have got 46 selections in which 32 are from SA and rest from sx.

Note by Spandan Senapati
3 months ago

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Any idea about what he told your father? · 3 weeks, 2 days ago

No nothing much he asked me where is your father.I just introduced him.And he told something which I didn't hear awe stood a bit away from him...He seemed to be a good person. · 3 weeks, 2 days ago

Can you please help me? A particle of mass 'm' moves under a force given by F= -kx^n.Find time period of oscillations if spring constant is k. Here n is any odd integer. · 3 weeks, 2 days ago

@A E Ya its of the form $$8x(o)^((1-n)/2)/w(n+1)int(sin@^\((2/n+1)d@)$$).with @ varying from $$0-π/2$$ and $$w^2=2k/m(n+1)$$ Here the numbers $$2/n+1)$$accompanying $$sin@$$ is the power that sin has been rairaised to.and the no$$1-n/2$$accompanying the x(o)term is a power . · 3 weeks, 2 days ago

Why will it not depend on amplitude? · 3 weeks, 2 days ago

OK so it has a value of $$(√π)/2T\((n+3)/2(n+1)$$/$$T(n+2)/(n+1)$$). T is the gamma function · 3 weeks, 2 days ago

Comment deleted 3 weeks ago

@A E Lot of messy stuffs involved..Just solving differentials.Not much n physics involved here I guess. · 3 weeks, 2 days ago

Can you please explain how to derive time period from the beginning? · 3 weeks, 2 days ago

Ya it will intact the amplitude is the x(o)term.Hey try putting $$.sin@=e^(iy)-e^(-iy)/2i.$$Most probably the binomially expanding yieldmsome thing but then that's not in closed form. No don't work it becomes tedious. · 3 weeks, 2 days ago

What's m here? · 3 weeks, 2 days ago

Yup closed form does exist use beta function and then gamma function done. · 3 weeks, 2 days ago

So what did you get I don't know beta functions much.

r · 3 weeks, 2 days ago

I have not solved it till end.You may directly use beta function's defination to evaluate that integral.Just look up on brilliant wikis. · 3 weeks, 2 days ago

Well that's not in scope of JEE Atleast although i love gamma and beta functions.

@A E Can you share pdf? · 3 weeks, 2 days ago

I don't have it now,but it was in some PDF related to MIT's open course ware.Try googling it,I suppose its still on their site. · 3 weeks, 2 days ago

But many trignometric integrals as well as integrals of the form (x)^a(1-x)^b can be solved under 1 minutes (and it has appeared as a previous jee question where normal method was very long).

Thus it is worth learning even from jee point of view i guess. · 3 weeks, 2 days ago

I learnt it coz i loved integrals when it was taught to us! and yeah that helped only in AITS :p · 3 weeks, 2 days ago

Did you had any backlogs at the end of class 11? · 3 weeks, 2 days ago

Yep many i had . one of my backlog is still there which i haven't overcame FLUID MECHANICS . In chemistry i mostly didn't got Organic of 11th which i improved in 12th . in maths combinatorics troubled me and it still sometimes coz its a kind of topic which you cant master completely . · 3 weeks, 2 days ago

How did you solve it? · 3 weeks, 2 days ago

How did you do it?I tried doing it with normal integration and things are getting very tedious? · 3 weeks, 2 days ago

Ya substituted=x(o)(sin@)^(2/n+1).Although I don't know whether its closed form exists of the integral.But next let me Think · 3 weeks, 2 days ago

Well this kind of problem has been asked in jee but was somewhat easier . If i can reckon correctly it had something proportionality constant (alpha) · 3 weeks, 2 days ago

I found this question in some PDF related to SHM. · 3 weeks, 2 days ago

Yup the problem mentioned smthing additional like small amplitude,i also remeber. · 3 weeks, 2 days ago

Well i did SHM arhive in september 2015 but i marked that question coz i was not able to do that at first shot thats why i remember otherwise there are 100's of problems in archive · 3 weeks, 2 days ago

@A E Ha Ha it reminds me of my friend's interview last year . he was asked the time period for F = -kx^3 . IDK But the professor told him F = -Kx where K = kx^2

Hence time period = 2pi*sqrt(m/kx^2) i know its not logical at all but one of professors of the panel told my friend this :P :P · 3 weeks, 2 days ago

Did they tell the actual answer ? · 3 weeks, 2 days ago

Your interview went quite well plus aptitude marks = top 10 for you.

Congrats! · 1 month ago

No chance of top 10.I know a guy paean who is scoring as high in 90.and mine is 73.so its quite tough.but I expect a rank of within 100.BTW what's the highest in kvpy from yours state.I don't know sarthaks but his is mostly in 78-80. · 1 month ago

Yeah top 10 is really difficult . one of my friend got 86 in test and 64 in interview lasty year to get air 14 · 1 month ago

Well according to your interview experience . you will easily get 80+ or even 90.

According to that if you equalise last year your rank will be in the range 25-50 (considering difficulty the same as last year).

I Got about 70 in test and 81 in interview ended with 59 .

My friend got 73 in test and 75 in interview ended with around 50. · 1 month ago

68-70 Nimay Gupta · 1 month ago

Ohk. · 1 month ago

Wish you all a prosperous holi! :) · 2 weeks ago

Happy holi to all 😀 · 2 weeks ago

Same 2 u bro ..... · 2 weeks ago

Yup same to you.......... · 2 weeks ago

Best of luck @Harsh Shrivastava.for your interview tomorrow.do share your experience tomorrow.just stay calm and give your best.you gonna rock it☺☺ · 2 months ago

Thnx! · 2 months ago

bhai ye dekh

https://www.change.org/p/cbse-do-lenient-in-cbse-physics-exam-2017-for-class-xii

Itna mushkil to nhi tha paper? · 1 week, 3 days ago

ghanta mushkil tha :P agar 5-6 number grace de di to mere to 100 paar jayenge number :P balki set-3 tha sabse mushkil maine saare set dekhe the haina bhai ? tere kitne aajenge btade bhai plz ? · 1 week, 3 days ago

now i'm feeling bad about bragging too much without even knowing my real marks , just hope i get what i want btw math mein fatti padi hai bhai help @Prakhar Bindal · 1 week, 2 days ago

@Spandan Senapati, @Harsh Shrivastava, @A E try this https://brilliant.org/problems/down-she-goes/ · 1 week, 4 days ago

I am getting a non integral answer, I used energy conservation and the fact that since string is inextensible,velocity along them would reduce to zero though I may be wrong. · 1 week, 4 days ago

I also wrote momentum impulse equations. · 1 week, 4 days ago

And I guess we are gonna receive the Kvpy results soon.Let's hope for the best.Lastyr it was declared on 22nd.March · 1 week, 4 days ago

Why are you worrying? You will get through easily ☺

I am doubtful about mine. · 1 week, 4 days ago

Arey don't worry .You will get through as well...You qualified NTSE stage 2 as well I guess · 1 week, 4 days ago

I haven't tried it but is the bead fixed.Or the situation is just like a catenary.(chain hanging between 2 walls) · 1 week, 4 days ago

How was aiits? @Spandan Senapati @A E @Aniswar S K

I committed so many silly mistakes! :( Dont know when will i stop it :(

Srsly i dont know why i commit so many mistakes :(

My score=20+27+48(cmp) · 2 weeks, 6 days ago

Ya.I checked the key it's so incorrect....Maths in a matrix I got-4(Hyperbola)The physics is wrong as well.Esp the first 2 questions.....(Now as per the incorrect key I got (33+25+57).Don't know but in maths the coefficient of(term independent of x is given wrong)...And they also gave that meso compound one wrong.Seriously I hate fiitjee exams for their incorrect answer keys..... · 2 weeks, 6 days ago

Yeah m,any are wrong i dont know why but in every exam it occurs :\ · 2 weeks, 6 days ago

Oh yes you are right.I thought the ball was dropped when the other was at mean position.Rather its given that its the extreme........silly me.:) · 2 weeks, 6 days ago

Lol many of these kinds of mistakes are committed by me also.We must stop making these mistakes! · 2 weeks, 6 days ago

And the SHM was wrong as well energy will change as they stick...And time period and amplitude will change as well.......Careless people.Allen in this regard is grt.I have given n their xms twice and never was there a single wrong and. · 2 weeks, 6 days ago

Why shud enrgy change?Also why shud even time period change?

See archive page number-65 jee advanced 2016 multi choice question 1 for a similar question. · 2 weeks, 6 days ago

We have a screwed up schedule here.I told you.Here they conduct exams from 6-9pm and they don't put the answer keys even.How did you get the answer keys......I will be telling tomorrow. · 2 weeks, 6 days ago

6-9 pm!!

Overall howasit? · 2 weeks, 6 days ago

Maths was good.Chem seemed easy this time.Let's hope for best.Chill bro.I have exam tomorrow(chem practical)and I have bunked almost class(or absent).So I don't know even how do a simple salt analysis....(☺☺)And although I had done some in preparing for OCSc last yr I don't remember any....... · 2 weeks, 6 days ago

Hey spandan, one doubt in the question posted by aniswar , I solved it by iaor method.But then I tried solving by force torque method that is by drawing individual fbds but could not solve it.My doubt is what forces will act on the particle from ground frame? · 2 weeks, 6 days ago

Weight of the particle,contact forces by the rim..........But we need to analyse what sorts of acceleration it has. · 2 weeks, 6 days ago

I was doing a calc mistake, got my mistake, and yeah result is same in both cases ☺ · 2 weeks, 6 days ago

Good....Were any answers wrong in phy and maths....Were did you get the keys from · 2 weeks, 6 days ago

My center gave us key and some are wrong.I am posting solution to aniswars problem, do verify it. · 2 weeks, 6 days ago

Ya it went nice.In Physics I think one and didn't match.That rolling one It must be $$(8/35)v/ug$$. · 2 weeks, 6 days ago

I think answer is matching, coming out to be 3/7 v/ug many of my fnds also got 3. · 2 weeks, 6 days ago

Well the friction will change its direction may be I did some calc mistake but its like this initially it acts backward so time taken for w to become zero=(v/2R)*(2/5MR^2)/fR.=v/5ug.and for v to become zero its v/ug.So w becomes zero first then v=4v/5at that instant.Next friction supports rotation and opposes translation so 4v/5-ft/M=5ft/2M(t=8/35)OK then we needed to add with the initial.so that t=3/7..Oh I missed that......Got it thanks. · 2 weeks, 6 days ago

Comment deleted 2 weeks ago

Arey i tagged aniswar sk, dont know why you are tagged. · 2 weeks, 6 days ago

@Harsh Shrivastava.can you share with me some questions that theyasked you in your interview. · 1 month, 1 week ago

I was the last one to be interviewed so they asked me easy questions.

First they asked me C1+C2+C3+C4+....Cn prove this in two ways.

Then they asked a multinomial type question .

Then an easy physics question was asked.

That's all.Best of luck! · 1 month, 1 week ago

How is class 12th jee preparation is it more difficult than class 11th?

My class 11 is about to end. · 1 month, 2 weeks ago

Nothing is difficult in this whole world ... stop thinking about that and let the studies keep going... · 1 month, 2 weeks ago

I Would not say difficult (class 12) just its a bit bigger than class 11 in terms of syllabus . but class 12 mostly has 55-60% weightage in JEE So you can understand its importance. · 1 month, 2 weeks ago

mine is 14. · 1 month, 3 weeks ago

Hey looks like you qualified nsec.from your discussion.this is indeed a grt achievement considering the fact that you are in 11.which state and about your kvpy(when is it) · 1 month, 3 weeks ago

Mine is 14/2 =7th rank · 1 month, 3 weeks ago

in my school only 3 people have been selected 1 sa and 2 in sx · 1 month, 4 weeks ago

Yup all the best @Harsh Shrivastava

I Will give just one advice. clearly say if you dont know an answer . dont blindly guess . stay calm, cool take your time to think upon the problem. you will rock it · 2 months ago

Thnx! · 2 months ago

Be confident , there main target is to check your confidence , they will try to just confuse you in your concepts itself and they will question you continuously , you just need to answer them with full confidence and correctness . And never answer those q which you don't know as wrong answers are not encouraged there and be upto the point , don't add extra waste things to your answer . · 3 months ago

will bio question would be asked to a pcm student · 3 months ago

I can't really gurantee that , but according to me they won't do such things . They understand the problem of students . · 3 months ago

Thanx for your suggestions.will they be asking questions from all the 4 subjects. · 3 months ago

Depends , for me , they ask my favourite subject (Physics ) and then they asked for maths also . · 3 months ago

What was your stage 1 marks?.does it any way matter in stage 2?? · 3 months ago

My score was low due to Bio, it was 66.5 , however in second stage they dont ask your scores , they are not interested in that. · 3 months ago

my score in bio is just 11.total 72.75.did you chose any special topic of interest for it??and tell me how did you prepare?we have got mock interviews organised by our school.And they call scientists for that even.so even those who qualify the first stage by a small margin perform well in interview.any way I am also planning to go with phy. · 3 months ago

11 is big no in bio my score was 0.75😂 · 1 month, 4 weeks ago

Your score in 1st stage matters for selection , in second stage its obvious that u will get good score , I didnt do anything special for interview , just searched net for other people experiance.

My score in Bio was just around 6 :P · 3 months ago

@Spandan Senapati @Harsh Shrivastava what are your Aiits-4 ranks?? Mine is 114. Have to improve little next time. · 1 day, 15 hours ago

When are the kvpy results coming · 2 days, 17 hours ago

My friend told that his father had called kvpy office and they told its most probably to come out on 2nd April...Delay is a bit clear to me as in our interviews they had not collected the mark sheet.Some had to send them later(including me)...So abt a week or so to go.... · 2 days, 15 hours ago

This may be useful to you.Past year aits papers.

http://jeewizard.blogspot.in/2015/01/fiitjee-aits-2015-all-sets-of-question.html · 6 days, 19 hours ago

How is TMH for maths?

@Prakhar Bindal · 6 days, 22 hours ago

My views are

Algebra- AWESOME Simply awesome you can't get a better book than this

Coordinate geometry- too easy . definitely not of advanced level (especially conics straight lines and circles are too good but conics sucks in this book)

Calculus - Not too good . Arihant is too better

Vector 3D- Personally not tried it · 6 days, 22 hours ago

I ordered this book bcoz my coordinate is not strong.So what do you use for coordinate geometry? · 6 days, 19 hours ago

I Would recommend SK Goyal's Coordinate geometry · 6 days, 19 hours ago

@Spandan Senapati I don't think the bead is fixed it can move · 1 week, 4 days ago

@shubham dhull how was physics? · 1 week, 4 days ago

It was good . I Cant say about marks at all . Semiconductors was a bit bad . expecting for the best . 2nd april is a big day JEE Mains!! · 1 week, 4 days ago

acha bhai bye , meri physics hi thik h math me fatti pdi h pre-bord me 60 no. the , uski tyari krni h atleast 90-95 ke aas-ps to phuch hi jaoonga padke jauhga too.. best of luck bro · 1 week, 4 days ago

thik ti yaar aimed for 100, itni zabardast tyari ti , fir bi 95-98 aage to mei bhut khush hu , teri ? · 1 week, 4 days ago

mera pre-board mei isse acha hua tha fir bi 67.5/70 aaye te considering bord ki checking 95 to aa jane chiye bhai. bas 1 glat hoga last Q , mhuje usme doubt h bataeo bhai :) · 1 week, 4 days ago

@Spandan Senapati I am sorry for underestimating the question! · 1 week, 6 days ago

No problem.Take your time and if you do by force method it will be good as well..That is indeed a tough fluid mech question..... · 1 week, 6 days ago

@Spandan Senapati For that Seiche question. i tried like this when you displace by z (net pulling force)/ mass = acceleration. a= 2 z bh g/ lbh = 2zg/l T = 2pi/w=2* 3.14* (70000/2*10) ^ 0.5 = 6.19 minutes What is the mistake?? · 1 week, 6 days ago

You can refer the book by AP French(MIT Introductory Physics Course). · 1 week, 6 days ago

And in systems as such its better to make use of energy conservation..And this question needs some more thinking.Let me give some hints(1-Eq of continuity 2)Co amputation of potential and kinetic energy of system(integrals).Force method is useful in systems where you are able to predict the behaviour of forces,their magnitudes etc.And here it will be quite apparent that analysing forces isn't quite easy.... · 1 week, 6 days ago

@Harsh Shrivastava Shouldnt R be equal to sqrt2 r?? · 1 week, 6 days ago

That's a upper bound that you can restrict the ration to be.But we need the best bounds.And that won't be possible for this process must be accompanied by some net heat exchange(Or else just a sort of ideal process.Violation of 2nd law). · 1 week, 6 days ago

Why is the answer 2.674 · 2 weeks ago

I think it is correct.What are you getting? · 2 weeks ago

Problem

I have posted a problem, do try it and verify weather it is correct or not. · 2 weeks ago

What did you mean by best bound? · 2 weeks ago

Ya I solved it.Rather put me first into thinking why T and P have not been given.But the question needs some cold analogy.Good.BTW You said to post some Mech q.I have posted 2 Fluids q...Try them esp the one "Seiche".That is something that we witness everyday but don't put into maths. · 2 weeks ago

Hey in that utube question,can u plz attach a diagram? · 1 week, 6 days ago

I am unable to do that despite your telling me · 1 week, 5 days ago

Thanks! Will try your ques. · 2 weeks ago

@Spandan Senapati -- in that 65th question how to relate the rate of increase of temperature and speed of piston?? i tried something like PdV + VdP = nRdT. dV=Adx & dP=kdx/A since P=kx/A. and then divide both sides by dt. but then i am not getting that 3/8 in the answer. · 2 weeks, 1 day ago

Hey there is a thing that the piston is nt massless so Weca t equate the forces perhaps. · 2 weeks ago

For 64 make use of the fact that the max theoretical increment in temperature accounts for the increase in internal energy =Increment in potential energy so $$nCv(T-To)=Mgh$$ and $$nRTo=(p+∆p)V$$.It's a valid supposition that initially the Tempnof the air inside is $$To$$ · 2 weeks, 1 day ago

For finding the height should we use (PV ^ γ) = constant ?? · 2 weeks, 1 day ago

@Spandan Senapati - Yah i got it now. First i considered even atmospheric pressure thats why i got some extra variables. Thanks. · 2 weeks, 1 day ago

Did u solve?? Advanced Problems in School Physics · 2 weeks, 1 day ago

Ya I s just saw and solved q 65.That's quite easy.Use conservation of energy for the entire system.We can find out the height h(but that would involve solving some hell weird exp) So they indirectly gave that h.And the other thing is simple the exp of the gas is adiabatic.Most of the qseem to be from energy conservation · 2 weeks, 1 day ago

https://plus.google.com/+AniswarSK/posts/X2voKbB5pEx · 2 weeks, 1 day ago

@Spandan Senapati @Harsh Shrivastava can you try these out?? · 2 weeks, 1 day ago

https://plus.google.com/+AniswarSK/posts/BbvETFvttbe · 2 weeks, 1 day ago

From which books are these questions from?

Are you on Google hangouts? · 2 weeks, 1 day ago

Link is not opening, what is it? · 2 weeks, 1 day ago

@Spandan Senapati are you in slack?? · 2 weeks, 2 days ago

No I am not active in any forum. · 2 weeks, 2 days ago

@Spandan Senapati which Allen exams did u write?? Are they at a better level these aiits · 2 weeks, 5 days ago

Guys try this * Q https://brilliant.org/problems/all-mixed-up/?ref_id=1331154 · 2 weeks, 5 days ago

Hey @Aniswar S K,@Harsh Shrivastava.I got to know that we can intact challenge the answer keys online by creating an account so.Let me check · 2 weeks, 6 days ago

www.fiitjeelogin.com then go to test performance · 2 weeks, 6 days ago

yep you can i had done it many many times in class 11 · 2 weeks, 6 days ago

Around 105 For waves and heat transfer is not over. · 2 weeks, 6 days ago

@Spandan Senapati Is the bottom most point the instantaneous centre of rotation?? If so shouldn't we consider torque of pseudo force?? · 2 weeks, 6 days ago

Exactly you got it right.There is an acceleration $$w^2R$$so we need to apply a pseudo torque as well. · 2 weeks, 6 days ago

Lots of answer key changes. I was depressed after seeing the answer key. How can xy=2 be the hyperbola equation in the match when (2,2) doesn't even lie on it. And even the meso compound they have given wrong answer · 2 weeks, 6 days ago

Yup but they don't change the answer keys so we will get marks acc to that only.What are your marks acc to wrong answer key? · 2 weeks, 6 days ago

Ya sometimes they don't.I remember in aiits-2 on checking physics my marks were (-13/67.Yes minus thirteen)☺☺.After the results were out my marks were(62/67).So they do change in case there is a major fault or technical one.But in normal cases they dont care · 2 weeks, 6 days ago

I saw this problem in GMP https://brilliant.org/problems/roll-and-roll/ · 3 weeks ago

Even I knew the answer.Quite easy.either write energy or differentiate or take torques about instantaneous centre of rotation.Rather taking the torques about the ICOR is short.Another approach would be to draw the fbds.and then take torques about individuals centre of mass · 3 weeks ago

Well i haven't solved GMP Yet but its from my CPP And hence i even remembered the answer to the problem! :P · 3 weeks ago

@Spandan Senapati I am getting around 57 in kvpy stage 1. And I know Siddharth Sridhar. We were in same institute last year. How did you come to know him?? · 3 weeks, 2 days ago

Allen champ.Even I had been nominated but I was not in top 10.But he has a good record in Allen champ. · 3 weeks, 2 days ago

@Prakhar Bindal.@shubham dhull.@Aniket Sanghi.@Harsh Shrivastava.@A E.@Aniswar S K.Hey guys I am getting a different and .what are you getting????https://brilliant.org/problems/charge-redistribution/.For a simplistic version try the IPHO 2010 Theoritical problem 1. · 3 weeks, 2 days ago

It seem all of us are quite habitual to this habit of silly errors. i too lost many points in AITS Open test due to my negligence and of course my laziness. What happened was i did physics pretty good which i attempt first (score 48/62) then got into chem . clean bowled didn't knew many Multi corrects . due to this made a bubbling error (4 marks puff!) . Then switched to maths again did well (43/62) . then came to chem at last . i could have scored easily upto 32/62 but got only 15 due to my silly errors and my laziness (i didn't got a nice sleep last night and hence slept from 12 pm to 12:30 pm in paper 1) :P (paper was from 9:30 to 12:30) . but somehow i came over this sleepiness and managed to remain awake whole paper 2 :P · 3 weeks, 2 days ago

I don't feel sleepy......☺☺☺ · 3 weeks, 2 days ago

Good you know i am lazy sometimes but i cant help it . Neend aati hai to aati hai main kya karun :P · 3 weeks, 1 day ago

Sach main....Bhai Jee main mat sona.....pichle din sleep well. · 3 weeks, 1 day ago

Yep i will take care before JEE . If not I My mother will of course :P · 3 weeks, 1 day ago

lol of course , bro slack pe kb aayega ? · 3 weeks, 1 day ago

After 21st May · 3 weeks, 1 day ago

well i hope we wouldn't need it after advanced , we may land in the same IIT :P · 3 weeks ago

We can just work . Almighty will give us what we deserve . Hope so! · 3 weeks ago

indirectly saying you don't deserve it :P · 3 weeks ago

Well i am somewhat philosophical guy .if i have worked hard and i deserve it i will certainly land there · 3 weeks ago

i am somewhat philosophical guy too ...aur wo line mere liye thi naki tere liye (of-course u r in better condition than me now.) i meant to say that i need to work hard to reach ur level. · 3 weeks ago

I feel sleepy in second paper many times :P · 3 weeks, 2 days ago

And hence even being paper 2 was tougher than paper 1 i scored more in it . :p

From that day i have decided before any major test i will sleep max by 11 pm · 3 weeks, 2 days ago

bhai tune computers le rka h ya physical ? · 3 weeks, 2 days ago

Physical education · 3 weeks, 2 days ago

maine computers le rhka h, mri pdi h :P · 3 weeks, 2 days ago

tell quickly i need togo .. · 3 weeks, 2 days ago

Although I solved that IPHO one .This one I got $$U=-kq^2/2(R/d)(1/R-1/d^2-R^2)$$ · 3 weeks, 2 days ago

are u telling ? · 3 weeks, 2 days ago

On substituting the values I got -0.09375.........Sorry Late reply.School exams has 6th ko khatam hone wale hain..How did you do?????.I did the following.1)Finding the surface charge density from superposition and gauss theorem.2)The potential at any point on the sphere due to itself can be found out.And considering a ring and using $$dU=Vdq$$and dq=sigma*area of ring. I found outU.But the energy of interaction is (U/2).Since here we have considered the same interaction twice.How did you do.????Batana. · 3 weeks, 2 days ago

i'm gonna upload , hope u understand my writing ! · 3 weeks, 2 days ago

my fone just starts charging so i can't upload :( i did like this.... using method of image , the whole charge induced can be seen as point charge .magnitude = $$\frac { -R }{ d } q$$ distance from center of sphere . $$\frac { { R }^{ 2 } }{ d }$$ solving finally i got .... $$-k\cfrac { R{ q }^{ 2 } }{ { d }^{ 2 }-{ R }^{ 2 } }$$ i still don't understand y it's wrong :P n abt silly mistakes .... don't let ur mind roam here and there . just do what u r doing , i do a lot of silly mistakes too as while solving when i'm on 1st step my mind goes to last step already and tries to get the answer which results in a wrong first step :P uh too much typing /....slang english :P · 3 weeks, 2 days ago

Another thing that I must add is when you are calculating the interaction energy between the sphere and the point charge you place the image charge and calculate their interaction energy with the point charge right.But now this must be divided by 2.Because of space symmetry(I don't know the general proof although I had once verified that the statement is true).........I hope you got the mistakes in your solution... · 3 weeks, 2 days ago

ofcourse i get it . · 3 weeks, 2 days ago

No you need to place 2 image charges.Because the first charge as you did is correct $$-qr/d$$ at a distance$$R^2/d$$from the centre but now we need to do 2 things 1)Maintain the electrical neutrality of he sphere and2)Make the spherical surface an equipotential so This could be done by placing another image charge $$qr/d$$ at the centre.And another thing that is wrong is the interaction energy between the sphere and the point charge is what you have calculated perhaps.The question asks for mutual interaction energy between charges induced..And there is a mistake in calculation of the interaction energy between the sphere and point charge..... · 3 weeks, 2 days ago

i have 1 chance left tho. in the problem :P · 3 weeks, 2 days ago

i completely misinterpreted the Q . · 3 weeks, 2 days ago

Which Q. are you talking about? · 3 weeks, 2 days ago

for which Q ? · 3 weeks, 2 days ago

Search the problem charge redistribution by David mattingly · 3 weeks, 2 days ago

what u got ? · 3 weeks, 2 days ago

Ya I did that only 2 point charges(image)need to be placed inside the sphere.Then used symmetry and later some integration.Can you tell your and.That IPHO one was uite easy for that was grounded the potential would be zero so.The integrtiopn was quite simple. · 3 weeks, 2 days ago

Comment deleted 2 weeks ago

Its $$U=-kq^2/2(R/d)(1/d-d/d^2-R^2)$$☺☺ .This one yielded 0.00625 as the and☺ · 3 weeks, 2 days ago

I guess you should not reveal the answer like this . I think you should delete it now... · 2 weeks, 5 days ago

Your final method ? As I am getting answer by a very easy approach , just have to think on the reason ! · 2 weeks, 5 days ago

A no of methods can be used perhaps.I know 2-3.One involves integration,another simply placing the image charges and calculating their interaction energy(divide by 2 because of space symmetry). Another approach could be to bring the charge from infinity and calculating the work done gets stored as total electrostatic energy of the system.Bhaiya I spent abt the entire night working different methods of solving this question☺☺☺ · 2 weeks, 5 days ago

You gotto give IPHO this or next year...? · 2 weeks, 5 days ago

No I didn'tget selected for Ocsc this year.Although I had tried my level best.My sir told that this hrs inpho was more of jee style q(except last one).But I had practised more of modern physics....and stuffs and they put a simple 3mqrks q from it.:).This time I will try again as I am ingoing to 12th..Let's see if Ipho is possible this yr. · 2 weeks, 5 days ago

Your Hard work worth applauding 👏 ☺ · 2 weeks, 5 days ago

I spent about an hr, learning from IPHO 2010 and then creating the shortest method possible , my solution is up there :) · 2 weeks, 5 days ago

Ya I saw it....Good solution....I told in the 2nd way I did the same.We don't have classes now so I had enough time...... · 2 weeks, 5 days ago

I marked that q incorrect.First I marked 0.009375 as the data was given in metre I supposed.2)Next I marked -0.09375 also incorrect..WO and main 625....much tha · 3 weeks, 2 days ago

Aur ek baar calculation check kariyo.... · 3 weeks, 2 days ago

@Spandan Senapati tell quickly i need to go · 3 weeks, 2 days ago

use method of images · 3 weeks, 2 days ago

Yeah my kvpy interview is over. They asked many general questions like how is glass different from other solids? What is the force that binds the protons in the nucleus? Why is ice less dense than water? How to use equation of continuity in gardening? As far as subjects are concerned they asked pretty simple questions like equation of a straight line and the one perpendicular to it. And Bernoulli's theorem and its applications. Hydrogen bonding. And some graphs from kinematics. Finally they asked what do you want to do in your future. I told that I haven't decided. And they told that it was an honest answer. And thats it!! · 3 weeks, 2 days ago

What was your score in the first stage(expected score)......Do you know someone Siddhartha sridhar. · 3 weeks, 2 days ago

I think what you are saying is right. According to us the answer is h = 5x/2. In the book, the answer given was h= 2x/5. Might be they are wrong. Thank you very much for helping me.! · 3 weeks, 2 days ago

It is a light piston · 3 weeks, 2 days ago

OK then I will try again.Your kvpy interview is over I guess · 3 weeks, 2 days ago

how did you solve?? · 3 weeks, 2 days ago

Although bit seemed somewhere misleading.If the expansions are adiabatic we must have$$PV^y$$.And eventually if motion ceases we have pressure of gas=$$P(o)+mg/A$$.then volume can't be same........And its a light piston or does have some mass....... · 3 weeks, 2 days ago

I was in a hurry when I solved the q.So let me try again..Use energy conservation for the entire system.Change in potential energy=-negative of the change in the internal energy.And that for an adiabatic process $$∆U=∆(PV)/(y-1)$$.So this will yield $$h=25/2=12.5cm$$.And hydrogen has $$Cv=(5/2)R$$ · 3 weeks, 2 days ago

@Spandan Senapati, @Prakhar Bindal Try this question please https://brilliant.org/problems/a-ball-and-a-piston/ · 3 weeks, 3 days ago

As of now I got 12.5cm as the answer.Hydrogen is diatomic gas I guess. · 3 weeks, 3 days ago

Hey Spandan you were to post some mechanics problems? Please post them. · 2 weeks, 5 days ago

Ya.Let me search.Its been long since I solve them But till then try thishttps://brilliant.org/problems/challenges-in-mechanics-by-ronak-agarwalpart-4/?ref_id=1327854.....You will learn something new.This questions is grt for it tests a lot of concepts.I took abt 2+1/2 pages but did with basics. · 2 weeks, 5 days ago

It is indeed tough !

BTW can you help me with this problem: https://brilliant.org/problems/a-classical-mechanics-problem-by-animesh-mishra/

I am using energy conservation and ICR but not getting correct answer . · 2 weeks, 2 days ago

Ya that prob was tough indeed .I did it simple way.without ICOR.good if you do that way(byicor) · 2 weeks, 2 days ago

I am not getting the question.Where is it. · 2 weeks, 2 days ago

Here · 2 weeks, 2 days ago

I got entered 14.I solved in 2 ways but still got the same ans. · 2 weeks, 2 days ago

How did you solved it?please give hint not complete method. · 2 weeks, 2 days ago

One is ICOR another is constraint.I will try another way · 2 weeks, 2 days ago

Hey lemme post my method here, tell what is wrong?I will post at night, ok? · 2 weeks, 2 days ago

No dontnpost. tll how did you do.14 is incorrect. · 2 weeks, 2 days ago

Hey @Harsh Shrivastava.Suppose I wanna post a pic from phone.How can I do it?? · 3 weeks, 4 days ago

If you want to post pic for a problem, then while posting a problem you will get an icon to post.

To post it in comments,first go to publish problem, then click on post image then copy the link of image and paste it to the req place. · 3 weeks, 4 days ago

I have finished 11th · 3 weeks, 4 days ago

@Prakhar Bindal how are those mypat tests ?? · 3 weeks, 4 days ago

Well i haven't started them yet . but they are good (gave 1-2 last year) . in which standard u r? · 3 weeks, 4 days ago

@Spandan Senapati how do you prepare for aiits?? · 4 weeks ago

I mainly focus on chemistry in aiits .As I feel that's my weak area and work beforehand.honestly speaking I don't study physics much for the exam as I have a regular practice with the subject and for maths go on to revise class notes.And if possible solve the archive.They pick a lot from these. · 4 weeks ago

AITS Results out

@Spandan Senapati @A E @Harsh Shrivastava · 1 month ago

Well,my rank is not at all good,at least not worth sharing......have to improve a lot!!! · 4 weeks ago

Well my rank is average . i could have done much better . My rank 32 score is 205/372. (74+43+88) In PCM . Messed up chem to a great extent . i need to focus on it · 1 month ago

Awesome rank!

What question u want to ask? · 4 weeks ago

Ohh is it so . i will keep this in my mind . actually i was busy for sometime (you know boards begin from 9th march) and i am coming on brilliant just for solving and not having a look at my notifications :P · 4 weeks ago

Sorry for disturbance!

Best of luck for jee.

Just wanna ask should I do archive now or reserve it for last? · 4 weeks ago

Yep thanks .

Well i did it side by side. You will get sufficient material for solving in the end (RTPF, AITS Home papers, AITS , 10 AIITS , Centre level papers , MYPAT Tests). · 4 weeks ago

Did you use mypat in class 11 as well ? · 4 weeks ago

@A E I Had but didn't used. In 11th i was more focussed towards phase test , Packages , archive and AIITS · 4 weeks ago

OK thanks. · 4 weeks ago

Ohk I have solved for physics(little left) will do for maths and chem now. · 4 weeks ago

Chemistry archive is a must do thing. Its the best collection of problems for organic and inorganic . Maths archive is also a must do especially for calculus from where most of tough questions are asked · 4 weeks ago

Yeah guess thats why my Chen is very poor.I have not solved enough questions in physical and inorganic. · 4 weeks ago

You know what earlier the same thing was with me.I was so engrossed in physics that i rarely followed jee chemistry.So even if my marks were quite close to the toppers in maths and phy chemistry would be quite less.But now Iam focussing on it as all three sub are imp.Esp chemistry as questions are straightforward and it depends on how much practise you have done. · 4 weeks ago

So you want to clear iit?Research?? · 4 weeks ago

Research....I will do it anyways.maybe after undergrad from an IIT(if qualify for a good one ☺☺)or iisc straight after 12th.And you can do research in an IIT even.Engineering physics is good although not preferred by top rankers(air 6 chose it this year). · 4 weeks ago

In my opinion for research IISC and IISER's are the best place in the country. · 3 weeks, 6 days ago

Oh..I have solved enough in physical and so it doesn't put me in trouble.I like it as it involves some maths atleast.☺☺.BTW you have completed physics archive full???? · 4 weeks ago

Nope not complete but almost done(but last few chapters like heat and sound left.)

This year i was studying for inmo maths and thus did not gave attention to jee maths.But in the end my fate was not With me and could not clear inmo.But i will now give attention to both jee maths and chemistry.

Have u solved all fiitjee maths packages? · 4 weeks ago

Ya mostly all except p,c · 4 weeks ago

Ya I got them air-87.I am looking forward to aiits 4 on 6th . wbu??? · 1 month ago

my marks and rank are same :P 134.Did you received a message coz I saw result on the site provided by prakhar.

Your marks? · 1 month ago

Which website?can you say so that I can check · 1 month ago

http://aitsresult.fiitjee.com/

Don't you think very less people gave the exam? · 1 month ago

No I know that.But how did you get webacess code?? · 1 month ago

Call ur Fiitjee center and ask them for the code. · 1 month ago

OK leave of,I know from message .already quite sad and tomorrow I have maths xm.so I will try to forget this quickly and focus on studies. · 1 month ago

Yup any exam don't judge ones potential leave this xam.

BTW I also have maths xam tmmrw . · 1 month ago

Are you in DAV public school.coz Dav have a common schedule usually. · 4 weeks, 1 day ago

No I am in DPS durg. · 4 weeks, 1 day ago

I am in DAV Chandrasekharpur. · 4 weeks, 1 day ago

i'm in DAV , :P · 2 weeks, 5 days ago

Its 148 or. · 1 month ago

Mostly became overconfident(honestly).I could have managed a perfect score or so in the physics paper 2(but got only 34).Coz I just saw the q paper and was easily able to solve most of them straight away.I had even solved the entire paper..when I checked even I wasn't able to believe the mess I had done.Mistakes to such an extent that I marked a ans in the q paper but different in the answer sheet.Felt quite bad.Especially when my scoring subjects went bad there wasn't much I could expect with chem.So I am trying hard for getting within top 5 ranks in aiits 4. · 1 month ago

Some xms don't go well.but knack never goes away.it just hides. · 1 month ago

I also made several silly mistakes.Btw toppers marks are quite high(286) .How much ppl from ur region got? · 1 month ago

Yes that guy must be either lay jain or yash Gupta or pawan goyal from kota.sarthak got air-3Btw how do you know toppers score?? · 1 month ago

I saw result analysis on aitsresult site.How much score of sarthak? · 1 month ago

Webacess code.you knew them???he doesn't share his marks etc to others. · 1 month ago

I called my center and asked for the code.Why do kota ppl give Fiitjee airs?They must be enrolled in some other coaching inst I guess? · 1 month ago

I don't know.Its not quite difficult from them .Tse three people I told are ijso gold medalists and probably all three are going to grab the top three ranks in kvpy. · 1 month ago

@harsh Shrivastava. @Prakhar Bindal.are the advanced results out.our classes have been closed so I don't know.BTW do tell when they come · 1 month ago

No out till now. · 1 month ago

Nope they are not out yet. they are taking lot of time · 1 month ago

I got the marks of one of my seniors.currently in IIT Bombay,he had 74.25 in the aptitude and 86.33 in interview.total 77.27(air 8)in 2014.14 was difficult I guess.this yr biology stood the toughest.usually I scored abt 16-18(even once 22)but this yr couldn't do many despite of preparing well for it. · 1 month ago

How were your results? till now you must have got them .

In our exam we also had some answers wrong and they haven't corrected them . Stupid fiitjee people :P · 1 month ago

Actually we have our phase test going on here and I forgot to fill my mobile number in the omr so I guess I'll have to wait till Tuesday to get my results.I may be between 275-300 coz I got only 225-229 marks.

Prakhar Bhaiya any tips for improving in my jee preparation because I can't crack into top 100 no matter how hard I try :( please help. · 1 month ago

@Prakhar Bindal reply plz? · 1 month ago

.Ohh i didn't looked at this question before. Well i would say learn from your mistakes and decide not to commit again · 1 month ago

Hey harsh.if you don't mind.why don't you share your exp in form of a note or so. · 1 month ago

Which experience? · 1 month ago

Well,you rank should be about <200. · 1 month ago

@A E Ya its good should be abt 150s. · 1 month ago

Oh!!I just messed up my paper.got phy-107,math-95,chem-51.I hoped to get abt 115-120 in physics they haven't corrected.got air-83.kinda disappointed.chem was pretty bad inorganic.any advise?? · 1 month ago

Well i am searching for that answer . I Am shamed to say that i did only 1 MCQ of chemistry in paper 2 out of 8 coz i didn't remember any of shitty inorganic .

lets wait for result so that i can get a picture that whether all over india people have done bad or i need to improve mine · 1 month ago

I dontnknow why but i see a lot fluctuation in my ranks.in aiits 1 it was as bad as 52,in aiits 2 it was air-5,in aiits 3 it was -air-7 and now the worst one 83.What can I do more.?? · 1 month ago

I Cant say you get decent ranks in AITS (I Mean excellent rather) · 1 month ago

I didn't get you.. · 1 month ago

I Meant you get excellent ranks in aiits . go on on the same path · 1 month ago

Oh thanx.will try. · 1 month ago

Hey 2nd paper.do you think they should ask all those things like raoults law to an 11th.and I didn't even know what's the role of reagents.BTW you are talking abt paper of class 12 or ours. · 1 month ago

i told you last years open test was just too too easy .

Me being bad at chemistry got all india highest last year in paper 2 (72/80) · 1 month ago

Mine of course. they asked a question that Kiwi Drainex used to clear windows contains which elements in MCQ .

This shit is given in class 11 NCERT Gaseous state in some box my friends said · 1 month ago

Only the mains result are out.Yes they have not corrected wrong answers. My result is not good at all,got AIR 387. · 1 month ago