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# R Woessss

Can plzzz anyone give me step by step solution to this...

Note by Aßhĩмanyu Singh
4 years, 3 months ago

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Using the methods outlined on this page: http://www.rfcafe.com/miscellany/factoids/kirts-cogitations-256.htm, you can set up the following equation:

$$(\frac{1}{1 \ \Omega}+\frac{1}{1 \ \Omega}+\frac{1}{1 \ \Omega})^{-1} + (\frac{1}{3 \ \Omega}+\frac{1}{3 \ \Omega}+\frac{1}{3 \ \Omega}+\frac{1}{R}+\frac{1}{R}+\frac{1}{R})^{-1} +(\frac{1}{1 \ \Omega}+\frac{1}{1 \ \Omega}+\frac{1}{1 \ \Omega})^{-1} = 1 \ \Omega$$.

Simplifying,

$$(\frac{1}{3} \ \Omega) + (\frac{1}{1 \ \Omega} + \frac{3}{R})^{-1} + (\frac{1}{3} \ \Omega) = 1 \ \Omega$$

$$(\frac{1}{1 \ \Omega} + \frac{3}{R})^{-1} = \frac{1}{3} \ \Omega$$

$$\frac{1}{1 \ \Omega}+\frac{3}{R}=\frac{3}{1 \ \Omega}$$

$$\frac{3}{R}=\frac{2}{1 \ \Omega}$$

$$R=\frac{3}{2} \ \Omega$$.

The following simulation shows that when a $$5 \ \mathrm{V}$$ voltage is applied across the circuit, a $$5 \ \mathrm{A}$$ current results, which implies the equivalent resistance of the circuit is $$1 \ \Omega$$, verifying that $$R=\frac{3}{2} \ \Omega$$ is correct: http://imgur.com/WoS0Yn7 · 4 years, 3 months ago

hey ricky is there any other method ???? · 4 years, 3 months ago

abe mujhe to ye method jyaada easy lag rha hai · 4 years, 3 months ago

Look at the circuit, It is symmetric for any value of R. We can proceed to result in many ways including Kirchoff's law , One of the easiest method is given here . It can be only applied for a symmetric circuit(caution). Consider a 1 A current is flowing through it , as the circuit is symmetric 1/3 A will flow through each 1 ohm .Also 1/3 A will spit to 3 ohm and R, then finally 1/3 A will flow through last 1 ohm (1/3 A through each 1 ohm). Thus we get over all resistance as 1/3+(3 parallel to R)/3+1/3 =1 ,(3 parallel to R)/3=1/3 ,Thus R=3/2 . If any explanation needed, then please specify · 4 years, 3 months ago

What will be the current in 3 ohm resistance? · 4 years, 3 months ago

$$\frac{1}{9} \ \mathrm{A} \approx 0.1111 \ \mathrm{A}$$ · 4 years, 3 months ago

1ohm · 3 years, 6 months ago

symertrycity will help u calculate the some point as same if distance from source and sink are same it will make easier · 4 years, 3 months ago

hey abhimanyu u can try to unferstand this. as points A and B are given name other 6 points as C,D,....H. Then try to figure out if a current say I starts from point A u can see the just next 3 corners are all connected by a 1 ohm resistor. so the current will be divided equally. then try to figure out those corners and the wires connecting then are they equal? try to find out the symmetry. U also can find from back ward also. after starting from A u try to picturise if the current I enters b and the next three corners of B are all equal resistance wire connected so the current would have come all equally from all those 3 corners try to ratioanalise ur thinking this way. i hope u will solve the remaining part urself. · 4 years, 3 months ago

Try applying Kirchoff's Law. By Conservation of Charge, the current entering at A should leave at B, right? So start there. · 4 years, 3 months ago

plzzz can u give me step by step solution to this · 4 years, 3 months ago

FIrst Reply.. u are in which standard and do you know Kirchoff Law · 4 years, 3 months ago

i m in 10th standard, and according to cbse 10 physics syllabi, there is nothing as kirchoff law · 4 years, 3 months ago

There is a similar question in haliday,resnick and krane volume-2 physics book.Basically,here,you have to notice the symmetry and the points with the same potential.Through it,you can rearrange this circuit and solve it.Hopefully if i have not done any mistake in calculation the answer is 3/8. · 4 years, 3 months ago

although i know abot v , i and parallel and series circuits · 4 years, 3 months ago

hey, actually i am in class 10th and we have not covered this topic yet. · 4 years, 3 months ago

u can use star & delta techniques that will simplify it · 4 years, 3 months ago

sory where do you get that question · 4 years, 3 months ago

plzzz anyone · 4 years, 3 months ago

mantap, dapet soal darimananih? · 4 years, 3 months ago

that is indonesian language. iya mantap nih · 4 years, 3 months ago

English, please? · 4 years, 3 months ago

okay, i'll · 4 years, 3 months ago

is it 3/8? · 4 years, 3 months ago

From SOmewhere i got the hint that it's ans is 4/3 · 4 years, 3 months ago

R=3 DUE TO SYMMETRY OF THE CIRCUIT · 4 years, 3 months ago