Question

An electric dipole is placed in a uniform electric field.

(i) Show that no translatory force acts on it.

(ii) Derive an expression for the torque acting on it.

(iii) Find work done in rotating the dipole through 180º.

Answer 1

Electric dipole of charges + q and - q separated by distance 2a is shown in the figure.

It is placed in a uniform electric field at an angle θ with it.