Define Magnetic moment of a bar magnet. Explain the method of comparing the magnetic moments of two short bar magnets in tan B position in Null method.

Magnetic length of a bar magnet is

To measure the magnetic moment of a bar magnet, one may use

The magnetic field lines inside a bar magnet

State two properties of a bar magnet.

Draw magnetic field lines around a bar magnet.

Draw magnetic field lines around a bar magnet.

The magnetism of a bar magnet is due to

Two identical bar magnets of magnetic moment M each are inclined to 60^(@) as shown in figure . The net magnetic moment of the combination in this position , is

The magnitude of the equatorial magnetic field due to a bar magnet of length 2 cm at a distance of 1m from its mid-point is (magnetic moment of the bar magnet is 0.60 A m)

Time period of a bar magnet oscillating in earth's magnetic field is T. Its magnetic moment is M. Now, a bar magnet of magnetic moment 2M is brought near it. The new time period will be