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

Two point charges –4 μc and 4 μc constituting an electric dipole, are placed at (– 9, 0, 0) cm and (9, 0, 0) cm in a uniform electric field of strength 10^4 NC^–1. The work done on the dipole in rotating it from the equilibrium through 180° is : 

(1) 14.4 mJ 

(2) 18.4 mJ 

(3) 12.4 mJ 

(4) 16.4 mJ          (JEE-2025)