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Initially the spheres A & B are at potential V_A and V_B. The potential of A when sphere B is earthed

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V_A- V_B

V_A

V_A+V_B

V_B

answer is C.

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Detailed Solution

Initially P.D. between A and B is V_A - V_B. After connecting to earth also P.D. between A and B is V_A - V_B but potential at B becomes zero, potential at A becomes V_A - V_B.

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