Magnitude of torque = q E × 2 a sinq
       = 2 q a E sinq
Its direction is normal to the plane of the paper, coming out of it The magnitude of p × E is also p E sinq and its direction
is normal to the paper, coming out of it Thus,
ttttt  = p × E
(1 22)
This torque will tend to align the dipole with the field
E