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A conducting shell S1 having a charge Q ...

A conducting shell `S_1` having a charge Q is surrounded by an uncharged concentric conducting spherical shell `S_2`.
Let the potential difference between `S_1` and that `S_2` be V. If the shell `S_2` is now given a charge `-3Q`, the new potential difference between the same two shells is

A

V

B

2V

C

4V

D

`-2V`

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