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Consider three concentric shells of metal A, B and C are having radii a, b and c respectively as shown in the figure (a < b < c). Their surface charge densities are $\sigma, – \sigma$ and $\sigma$ respectively. Calculate the electric potential on the surface of shell A

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$(A) \large\frac{\sigma}{\in_0} $$(a-b+c)$
answered Jun 24, 2014 by meena.p