Question

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

Answer 1

$R=0.2m$
$Q=15\mu C=15\times {10}^{-6}C$
Electric potential an surface of sphere
$\begin{array}{c}V=\frac{1}{4\pi {\epsilon }_0}\frac{Q}{R}\\ V=\frac{9\times {10}^9\times 15\times {10}^{-6}}{0.2}\\ V=\frac{135}{2}\times {10}^4\end{array}$
$\Rightarrow V=67.5\times {10}^4$
$V=6.75\times {10}^5\text{volt}$