A hollow metal ball 8 cm in diameter is given a charge $-4 imes 10^{-8} \mathrm{C}$. The potential

Question

A hollow metal ball 8 cm in diameter is given a charge $-4 	imes 10^{-8} \mathrm{C}$. The potential on the surface of the ball is\

Professor PC Thomas Classes · Answer

Potential on the surface of a hollow sphere is $$ \begin{aligned} & V=\frac{1}{4 \pi \varepsilon_{0}} \frac{q}{R}=9 	imes 10^{9} \frac{q}{R} \ & 2 R=8 \mathrm{~cm} \quad R=4 \mathrm{~cm}=4 	imes 10^{-2} \mathrm{~m} \ & q=-4 	imes 10^{-8} C \end{aligned} $$