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Three concentric metallic shells A, B an...

Three concentric metallic shells A, B and C of radii a b and c `(a lt blt c)` have surface charge densities to `+sigma and- sigma` to `+sigma` respectively. The potential of shell B is

A

`(a+b+c)(sigma)/epsilon_0`

B

`(sigmac)/epsilon_0`

C

`(a^2/c-b^2/c+c)sigma/epsilon_0`

D

`(a^2/b-b+c)sigma/epsilon_0`

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