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 qq is placed at the peak of original cone what is their force of interaction? I got θσqln(2)2π\E0\theta \frac { \sigma q\quad ln(2) }{ 2\pi { \E }_{ 0 } } where θ\theta is the half angle and σ\sigma is the charge density on the frustum. Am I right?

Note by A Former Brilliant Member
2 years, 10 months ago

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plz help sir @Mark Hennings @Josh Silverman

A Former Brilliant Member - 2 years, 10 months ago

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also help bro @Prakhar Bindal

A Former Brilliant Member - 2 years, 10 months ago

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nobody helping me ? @Mark Hennings

A Former Brilliant Member - 2 years, 10 months ago

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First one, can you show me the question

Second one, check this out

Third one, I am lazy enough to even try!

Kishore S Shenoy - 2 years, 10 months ago

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no problem , you 'tle'st replied i'm h'ppy 'bout th't :)

A Former Brilliant Member - 2 years, 10 months ago

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'nd th'nks for the second one :) it worked i 'm going to post 'n origin'l problem on it :)

A Former Brilliant Member - 2 years, 10 months ago

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you were s'ying something bro @Kishore S Shenoy

A Former Brilliant Member - 2 years, 10 months ago

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What is the last one? Dimensions of the frustum?

Kishore S Shenoy - 2 years, 10 months ago

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l/2 sl'nt height , R r'dius 'nd sigm' is ch'rge density of the frustum .

A Former Brilliant Member - 2 years, 10 months ago

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What is \ell?

Kishore S Shenoy - 2 years, 10 months ago

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@Kishore S Shenoy 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

A Former Brilliant Member - 2 years, 10 months ago

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@A Former Brilliant Member Ohh, half. But still, I am getting in terms of r1r_1 and r2r_2

Kishore S Shenoy - 2 years, 10 months ago

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@Kishore S Shenoy m'y be you c'n you the h'lf 'ngle give in the question

A Former Brilliant Member - 2 years, 10 months ago

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got nything yet ? @Kishore S Shenoy

A Former Brilliant Member - 2 years, 10 months ago

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