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Three concentric metallic spherical shel...

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

A

`(a+b+c)(alpha)/(epsilon_(0))`

B

`(a^(2)/(b)-b+c)(alpha)/(epsilon_(0))`

C

`(a^(2)/(b)-b^(2)/(c)+c)(alpha)/(epsilon_(0))`

D

`(alphac)/(epsilon_(0))`

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