Q. A square of side $'a'$ has charge $Q$ at its centre and charge $'q'$ at one of the corners. The work required in moving the charge $'q'$ from one corner to the diagonally opposite corner is
A) Zero
B) $\frac{Qq}{4\pi \in_{0}a}$
C) $\frac{Qq\sqrt{2}}{4\pi \in_{0}a}$
D) $\frac{Qq}{2\pi \in_{0}a}$
Explanation
(a) From symmetry of the figure all corner have same electric potential. Therefore work done in moving the charge $q$ from the corner to the diagonally opposite corner is zero
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.