Q. A charge of $10\ e.s.u.$ is placed at a distance of $2\ cm$ from a charge of $40\ e.s.u.$ and $4\ cm$ from another charge of 20 $e.s.u.$ The potential energy of the charge $10\ e.s.u.$ is (in $ergs$)

A) 87.5
B) 112.5
C) 150
D) 250
Explanation

(d) Energy $= \frac{10 \times 40}{2} + \frac{10 \times 20}{4} = 250\ erg$

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.