Question

The work done in carrying a charge $q$ once around a circle of radius $a$ about a charge $Q$ at the centre is

• A. $\frac{qQ}{4\pi {\epsilon }_{0}r}$
• B. $\frac{qQ}{4\pi {\epsilon }_0}\frac{1}{\pi r}$
• C. $\frac{qQ}{4\pi {\epsilon }_0}\left(\frac{1}{2\pi r}\right)$
• D. 0

Answer 1

Answer: (D)

Since electrostatic force is conservative force, therefore work done by this conservative force in a round trip is zero.