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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 A is

A

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

B

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

C

`Q/ (20piin_(0)R)`

D

none of these

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