An electric dipole is held in a uniform electric field.
Show that the net force acting on it is zero.

Explanation

Consider an electric dipole AB held in a uniform electric field held at an angle `theta` with the direction of electric field `vec E`. Now force acting on +q charge, `F_1 = qE` along direction of `vec E ` and force acting on -q charge, `F_2 = qE` in a direction opposite to that of `vec E`.
Since `F_1 and F_2` are equal but in mutually opposite directions, hence the net linear force acting on the electric dipole will be zero.