Physics - Elecrostatics Question with Solution | TestHub

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