Question

he electric dipole is situated is an electric field as shown
in fig 1. The dipole and electric field are both in the plane of
the paper. The dipole is rotated about an axis perpendicular
to plane of paper passing through A in anticlockwise
direction. If the angle of rotation (ϴ) is measured with respect
to the direction of electric field, then the torque (τ)
experienced by the dipole for different values of the angle
of rotation ϴ will be represented in fig. 2, by
(a) curve (1) (b) curve (2)
(c) curve (3) (d) curve (4)​

Answer 1

a.

this is the solution