Question

A magnetic pole of bar magnet with pole strength of 100 Am is 20 cm away from the centre of a bar magnet. Bar magnet has pole strength of 200 Am and has a length 5 cm. If the magnetic pole is on the axis of the bar magnet, find the force on the magnetic pole.

Answer 1

For a bar magnet, magnetic dipole moment is, m = q_m(21)

For a point on the axis of a bar magnet at distance, r = 20 cm = 0.2 m,

The force acting on the pole will be given by,