Derive an expression for the electric potential at a point along the axial line of an electric dipole.

Define electric field intensity at a point. Give its S.I. units. Derive an expression for the electric field intensity at any point on the axial line of an electric dipole.

Derive an expression for electric potential at a point due to a point charge.

Define magneticfield intensity at a point. Derive an expression for magnetic field intensity at a point on the axial line of magnetic dipole with the help of diagram.