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Three concentric metal shells A, B and C...

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

A

`(sigma)/(epsilon_(0))[(b^(2) - c^(2))/(b) + a]`

B

`(sigma)/(epsilon_(0))[(b^(2) - c^(2))/(c) + a]`

C

`(sigma)/(epsilon_(0))[(a^(2) - b^(2))/(a) + c]`

D

`(sigma)/(epsilon_(0))[(a^(2) - b^(2))/(b) + c]`

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