Derive an expression for the magnetic induction at a point on the axial line of a bar magnet.

Derive an expression for magnetic field induction on the equatorial line of a barmagnet.

Write the expression for the magnetic induction at any point on the axis of circular current-carrying coil. Hence, orbtain an expression for the magnetic induction at the centre of the circular coil.

Derive an expression for the intensity of the electric field at a point on the axial line of an electric dipole.