A solid conducting sphere having a charge Q is surrounded by an uncharged concentric conducting hollow spherical shell. Let the potential difference between the surface of the solid sphere and that of the outer surface of the hollow shell be V. If the shell is now given a charge of `-3Q`, the new potential difference between the same two surfaces is :A. (a) VB. (b) 2VC. (c) 4VD. (d) `-2V`

A solid conducting sphere having a charge Q is surrounded by an unchar

1.	A solid conducting sphere having a charge Q is surrounded by an uncharged concentric conducting hollow spherical shell. Let the potential difference between the surface of the solid sphere and that of the outer surface of the hollow shell be V. If the shell is now given a charge of `-3Q`, the new potential difference between the same two surfaces is :A. (a) VB. (b) 2VC. (c) 4VD. (d) `-2V`
Answer» Correct Answer - A The potential inside the shell will be the same everywhere as on its surface. As we added `-3Q` charge on the surface, the potential on the surface changes by the same amount as that inside. Therefore the potential difference remains the same.

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