It is the product of strength of one of the poles and magnetic length of the bar magnet. It is represented by M.

Magnetic length is always slightly less than the true length of the bar magnet.

The magnetic moment of a bar magnet of magnetic length 2/ and pole strength m is given by

M = 2ml

It is defined as the magnetic moment per unit value and represented by J.

Intensity of magnetization of a bar magnet of pole strength m, magnetic length 2/ and cross-sectional area a is given by

J =   Magnetic moment   = M  = 2ml  = m
    Volume of the magnet    V     2l x a   a

Hence intensity of magnetization may be also defined as the pole strength per unit-area.

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