Distinguish Between ‘Paramagnetic’ and ‘Ferromagnetic’ Substances. - Physics

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Distinguish between ‘paramagnetic’ and ‘ferromagnetic’ substances.

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Solution

Paramagnetic Ferromagnetic
Substances which are weakly attracted by a magnet are called paramagnetic substances. Substances which are strongly attracted by a magnet are called ferromagnetic substances.
Paramagnetic materials lose their magnetism on removal of the external field and hence cannot be used to make permanent magnets. Ferromagnetic materials retain some magnetism on removal of external field and hence can be used to make permanent magnets.
The susceptibility is positive but small. The susceptibility is positive but very high.
In the absence of electric field, the net dipole moment is zero. In the absence of electric field, the net dipole moment is non-zero.
Aluminium, manganese, chromium and platinum are some examples of paramagnetic substances. Iron, nickel, cobalt, gadolinium, dysprosium and their alloys are some examples of ferromagnetic substances.

 

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2015-2016 (March)

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