Question

The work done is carrying a charge q once round a circle of radius r with a charge q at the center is?

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

Answer 1

The correct option is D Zero

Work done is given by $W=q\Delta V$

In the given problem, $\Delta V=0$ as initial and final points are same. Hence, work done is zero.