A solid conducting sphere, having a charge \( Q \), is surrounded by an uncharged conducting hol....

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A solid conducting sphere, having a charge \( Q \), is surrounded by an uncharged conducting hollow
\( \mathrm{P} \)
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 \( -4 Q \), the new potential difference between the same two surfaces is:
(1) \( -2 \mathrm{~V} \)
(2) \( 2 \mathrm{~V} \)
(3) \( 4 \mathrm{~V} \)
(4) \( \mathrm{V} \)


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