A conducting shell \( S_{1} \) having a charge \( Q \) is surrounde...

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A conducting shell \( S_{1} \) having a charge \( Q \) is surrounded
\( \mathrm{P} \) by an uncharged concentric conducting spherical shell \( S_{2} \). Let

W the potential difference between \( S_{1} \) and that \( S_{2} \) be \( V \). If the shell \( S_{2} \) is now given a charge \( -3 Q \), the new potential difference between the same two shells is :
(A) \( V \)
(B) \( 2 \mathrm{~V} \)
(C) \( 4 \mathrm{~V} \)
(D) \( -2 \mathrm{~V} \)
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