An electric dipole is placed at an angle of 30° with
an electric field intensity 2 X ``10^5`` N/C. It experiences
a torque equal to 4 Nm. The charge on the dipole,
if the dipole length is 2 cm, is :-
(1) 5 mC
(2) 7 µC
(3) 8 mC
(4) 2 mC