Question

A charge of $+15\mu C$ is given to a hollow metallic sphere of radius $0.2m$. Determine electric potential at the centre of the sphere

Answer 1

$R=0.2m$
$Q=15\mu C=15\times {10}^{-6}C$
At the centre of sphere
$\begin{array}{c}{V}_{\text{centre}}=V_{\text{surface}}\\ V_{\text{centre}}=6.75\times {10}^5\text{volt}\end{array}$