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\varepsilon_{0} r}$
• B. $ \frac{qQ}{4\pi\varepsilon_{0}} \frac{1}{\pi r}$
• C. $ \frac{qQ}{4\pi\varepsilon_{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.