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?

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Electromagnetism

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