Q. A point $Q$ lies on the perpendicular bisector of an electrical dipole of dipole moment $p.$ If the distance of $Q$ from the dipole is $r$ (much larger than the size of the dipole), then electric field at $Q$ is proportional to
A) $p^{- 1}$ and $r^{- 2}$
B) $p$ and $r^{- 2}$
C) $p^{2}$ and $r^{- 3}$
D) $p$ and $r^{- 3}$
Explanation
(d) $E_{equatorial} = \frac{kp}{r^{3}}i.e.\ E \propto p$ and $E \propto r^{- 3}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.