When the net force is zero, the torque (couple) is
independent of the origin Its magnitude equals the magnitude of
each force multiplied by the arm of the couple (perpendicular
distance between the two antiparallel forces) 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