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Three concentric spherical metal shells A.B.C of radii a,b,c`(c gt b gt a)` have surface charge density `+sigma, - sigma and +sigma` respectively. The potential of the middle shell is `(sigma)/(epsilon_(0))` times

A

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

B

(a-b+c)

C

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

D

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

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