Consider a uniform electric field having constant magnitude and direction the same at all planes. Consider an electric dipole with its electric dipole moment vector, \(\vec p\) making an angle θ with the field. (Fig.)
Since \(\vec E\) at any point is the force experienced per unit charge.
Hence, in a uniform electric field an electric field dipole experiences no net force; and therefore dipole does not undergo any translatory motion.
Torque acting on the dipole
These forces are equal in magnitude and opposite in direction, therefore, they form a couple.
