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Two concentric conducting shells A and B...

Two concentric conducting shells A and B are of radii R and `2R`. A charge `+ q` is placed at the centre of the shells. Shell B is earthed and a charge q is given to shell A. Find the charge on outer surface of A and B.

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It outermost shell is earthed. Then, charge on outer surface of outermost shell in this case is always zero.
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