Two point charges -4 μ c and 4 μ c, constituting an electric dipole, are placed at (-9, 0, 0) cm and (9, 0, 0) cm in a uniform electric field of…

Two point charges $\displaystyle -4 \mu \mathrm{c}$ and $\displaystyle 4 \mu \mathrm{c}$, constituting an electric dipole, are placed at (-$\displaystyle 9$, $\displaystyle 0$, $\displaystyle 0$) cm and ($\displaystyle 9$, $\displaystyle 0$, $\displaystyle 0$) cm in a uniform electric field of strength $\displaystyle 10^4 \mathrm{~N} \mathrm{C}^{-1}$. The work done on the dipole in rotating it from the equilibrium through $\displaystyle 180^{\circ}$ is :