It represents the extent to which a specimen is magnetised when placed in a magnetising field.
Or in other words the intensity of magnetisation of a magnetic material is defined as the magnetic moment per unit volume of the material.
M = Magnetic moment/volume = μM / V …1
Let a = Uniform area of cross-section of the magnetised specimen.
l = magnetic length of the specimen.
m = strength of each pole of the specimen,
As μm = ml
and V = al
then equation (1) becomes
M = m x 2l / a x 2l
or M = m/a
thus intensity of magnetisation of a magnetic material is also defined as the pole strength per unit area of cross-section of the material.
Unit : M= magnetic moment / Volume
M= Amp.metre2 / metre3 = Am -1
These are S.I unit of M
Reference: This article is referred from my book “electrical engineering materials” having ISBN: 978-81-272-5069-0.
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