Electrostatics on a metal sphere

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liewliewliew
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<<Moved from a technical forum, no template>>

Why the answer is A?
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I'm not sure of the A level label on this thread.

@liewliewliew , You must submit homework to an appropriate homwork forum and fill out the template, including your attempt at a solution.

The homework helpers won't help until you post your own attempt at a solution.
 
Have you been introduced to Gauss law? Do you that there is no E field in a conductor in Electrostatics?