Question

A hollow conducting sphere of radius R has a charge (+Q) on its surface. What is the electric potential within the sphere at a distance $r=\frac{R}{3}$ from its centre

• A. Zero
• B. $\frac{1}{4\pi {ϵ}_0}\frac{Q}{r}$
• C. $\frac{1}{4\pi {ϵ}_0}\frac{Q}{R}$
• D. $\frac{1}{4\pi {ϵ}_0}\frac{Q}{r^2}$

Answer 1

Answer: (C)

$\frac{1}{4\pi {ϵ}_0}\frac{Q}{R}$

Inside a conducting body, potential is same everywhere and equals to the potential at its surface