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Question

If a charge Q is distributed on the concentric hollow spheres of radii r and R(> r) such that their surface densities are equal then the potential at their common centre is

A
Q(R2+r2)4πϵ0(R+r)
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B
QRR+r
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C
Zero
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D
Q(R+r)4πϵ0(R2+r2)
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