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# Electromagnetism

I am having trouble in certain questions which involve the concept of earthing and potential among plates ! can you plz help by suggesting any methods about that? and 2nd ques, when we overflow a bottle we see the surface is not plane but curved ! what is the radius of that curve ? 3rd one there is a frustum of cone (which is formed by cutting half of a cone ) and one charge $$q$$ is placed at the peak of original cone what is their force of interaction? I got $$\theta \frac { \sigma q\quad ln(2) }{ 2\pi { \E }_{ 0 } }$$ where $$\theta$$ is the half angle and $$\sigma$$ is the charge density on the frustum. Am I right?

Note by Brilliant Member
8 months, 1 week ago

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What is the last one? Dimensions of the frustum? · 8 months, 1 week ago

l/2 sl'nt height , R r'dius 'nd sigm' is ch'rge density of the frustum . · 8 months, 1 week ago

got nything yet ? @Kishore S Shenoy · 8 months, 1 week ago

What is $$\ell$$? · 8 months, 1 week ago

it is just to s'y its v'lue is not going to 'ffect 'nswer 'nd it w's not even given in the question our interest lies only in the f'ct th't the cone is cut ex'ctly in h'lf · 8 months, 1 week ago

Ohh, half. But still, I am getting in terms of $$r_1$$ and $$r_2$$ · 8 months, 1 week ago

m'y be you c'n you the h'lf 'ngle give in the question · 8 months, 1 week ago

you were s'ying something bro @Kishore S Shenoy · 8 months, 1 week ago

First one, can you show me the question

Second one, check this out

Third one, I am lazy enough to even try! · 8 months, 1 week ago

no problem , you 'tle'st replied i'm h'ppy 'bout th't :) · 8 months, 1 week ago

'nd th'nks for the second one :) it worked i 'm going to post 'n origin'l problem on it :) · 8 months, 1 week ago

nobody helping me ? @Mark Hennings · 8 months, 1 week ago

also help bro @Prakhar Bindal · 8 months, 1 week ago