Q. A given charge is situated at a certain distance from an electric dipole in the end-on position experiences a force $F.$ If the distance of the charge is doubled, the force acting on the charge will be
A) $2F$
B) $F/2$
C) $F/4$
D) $F/8$
Explanation
(d) Force on charge $F = q\left( E_{a} \right) = q \times \frac{k.2p}{r^{3}} \Rightarrow F \propto \frac{1}{r^{3}}$
When $r \rightarrow doubled;F \rightarrow \frac{1}{8}times$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.