Initially the spheres A & B are at potential VA and VB. The potential of A when sphere B is earthed
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a
VA
b
VB
c
VA - VB
d
VA + VB
answer is C.
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Detailed Solution
Initially P.D. between A and B is VA - VB. After connecting to earth also P.D. between A and B is VA - VB but potential at B becomes zero, potential at A becomes VA - VB.