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A conducting sphere is enclosed by a hol...

A conducting sphere is enclosed by a hollow conducting shell. Initially the inner sphere has a charge Q while the outer one is uncharged. The potential difference between the two spherical surface is found to be V. later on the outer shell is given a charge -4Q. The new potential difference between the two surfaces is : (A) V (B) `-V` (C) `-2V` (D) `2V`

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