Derive the expression for the electric field intensity due to an electric dipole at any point on its equatorial line.

Derive an expression for the electric field intensity due to an electric dipole at any point on its equatorial line and show that the direction of the field is parallel to the axis of the dipole.

An electric dipole of small length lies along X-axis of a coordinates system. Derive an expression for the magnitude of electric field E due to the dipole at any point on its equatorial line. Mention its direction.

The ratio of the electric field intensity due to an electric dipole at an axial point to that at an equatorial point at same distance from the centre is

Find an expression for electric field intensity due to a point charges.

Derive the expression for the magnetic field intensity due to a bar magnet at any point on its board side-on position. Find the same when the length of the magnetic field intensity due to a bar side-on position. Find the same when the length of the magnet is small.

State Biot-Savart's law. Then using this law derive an expression for magnetic field intensity due to a circular coil at a point on its centre.