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Three concentric spherical shells have radii `a, b` and `c(a lt b lt c)` and have surface charge densities `sigma, -sigam` and `sigma` respectively. If `V_(A), V_(B)` and `V_(C)` denote the potentials of the three shells, then for `c = a + b`, we have

A

`V_C = V_A != V_B`

B

`V_C = V_B != V_A`

C

`V_C != V_B != V_A`

D

`V_C = V_B = V_A`

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A
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