Three concentric metal spherical shells A, B, C of radii a, b, c (a < b < c) have surface charge densities σ, -σ and σ respectively. The potential of C is
1
\(\frac{\sigma}{\in_0}\left(\frac{a^2}{b}-b+c\right)\)
2
\(\frac{\sigma}{\in_0}(a-b+c)\)
3
\(\frac{\sigma}{\in_0}\left(\frac{a^2-b^2}{c}+c\right)\)
4
None of these
5
Question Not Attempted