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Three concentric spherical conductors A,...

Three concentric spherical conductors A, B and C of radii R, 2R and 4R respectively. A and C is shorted and B is uniformly charged .
Potential at B is

A

`(Q)/ (4piin_(0)R)`

B

`(Q)/ (16piin_(0)R)`

C

`(5Q)/ (48piin_(0)R)`

D

none of these

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