Q. Work done in carrying a charge $Q_{1}$ once round a circle of radius $R$ with a charge $Q_{2}$ at the centre I s
A) $\frac{Q_{1}Q_{2}}{4\pi\varepsilon_{0}R^{2}}$
B) Zero
C) $\frac{Q_{1}Q_{2}}{4\pi\varepsilon_{0}R^{\ }}$
D) Infinite
Explanation
(b) Since electrical potential at any point of circle of radius $R$ due to charge $Q_{2}$ at its centre is same $V = \frac{Q_{2}}{4\pi\varepsilon_{0}R},\ \ $hence work done in carrying a charge $Q_{1}\ $round the circle is zero.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.