FORCE AND TORQUE ON A DIPOLE PLACED IN AN ELECTRIC FIELD
(a) A positive charge +q experiences a force parallel to the electric field ®F = q®E
(b) A negative charge –q experiences a force in a direction opposite to that of the electric field ®F = -q®E
(c) The total force on a dipole placed in an uniform electric field is zero ®F = q®E + (-q®E) = 0
(d) The torque on a dipole placed in uniform electric field is ®t = ®p x ®E Þ t = pE sinq
