Derive an expression for magnetic field intensity due to a small bar magnet at a point in the end on position.

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.

Define Magnetic field intensity.

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