Q 12-01-156NEETNEET 2022Top questionEasy
Two point charges $-q$ and $+q$ are placed at a distance of $L$, as shown in the figure. The magnitude of electric field intensity at a distance $R$ ($R \gg L$) varies as:
Answer: (C) $\dfrac{1}{R^3}$
The pair forms an electric dipole of moment $p = qL$. Far away ($R \gg L$) the field of a dipole, on the axis $\dfrac{2kp}{R^3}$ and on the equator $\dfrac{kp}{R^3}$, varies as $\dfrac{1}{R^3}$ in every direction.
Solution by Sreeraj P, M.Sc Physics