Question

Three concentric metallic spherical shell A, B and C or radii a, b and c (a < b < c) have surface charge densities $-\sigma$, $+\sigma$ and $-\sigma$ respectively. The potential of shell A is :

• A. $\frac{\sigma }{{\epsilon }_0}$[a+b-c]
• B. $\frac{\sigma }{{\epsilon }_0}$[a-b+c]
• C. $\frac{\sigma }{{\epsilon }_0}$[b-a-c]
• D. none

Answer 1

The correct option is C $\frac{\sigma }{{\epsilon }_0}$[b-a-c]