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Question
Why should electrostatic field be zero inside a conductor?
Solution
Charge on conductor resides on its surface. So if we consider a Gaussian surface inside the conductor to find the electrostatic field,
`phi = q/epsi_0`Where, q = charge enclosed in Gaussian surface.
q = 0, inside the conductor, hence the electrostatic field inside the conductor is zero.
`phi = oint vecE.dvecs = q/epsi_0`
`oint Eds cos theta = q/epsi_0`
`=> E = q/(4pi epsi_0r)` = (Since q = 0)
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