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 :
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
$(\sigma/ \varepsilon_0 ) [a + b - c]$
- B
$(\sigma/ \varepsilon_0 ) [a - b + c]$
- C
$(\sigma/ \varepsilon_0 ) [b - a - c]$
- D
none
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