Q. Work done in carrying a charge $\mathcal{Q'}$ once round the circle of radius $r$ with a charge $\mathcal{Q}$ at the centre is
A) $\frac{1}{4\pi\epsilon_{0}}\frac{\mathcal{Q}}{r}$
B) $\frac{1}{4\pi\varepsilon_{0}}\frac{\mathcal{QQ'}}{r}$
C) Zero
D) $\frac{\mathcal{QQ'}}{2r}$
Explanation
(c) Work done is zero because all the points on the circular path are at same potential.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.