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. $\frac{1}{4\pi\varepsilon_{0}}\frac{Q}{r}$
• C. $\frac{1}{4\pi\varepsilon_{0}}\frac{Q}{R}$
• D. $\frac{1}{4\pi\varepsilon_{0}}\frac{Q}{r^{2}}$

Answer 1

Answer: (C)

$\frac{1}{4\pi\varepsilon_{0}}\frac{Q}{R}$

Answer 2

Inside a conducting body, potential is same everywhere and equals to the potential of it’s surface