Distinguish between ‘paramagnetic’ and ‘ferromagnetic’ substances.
|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.|
Concept: Magnetic Properties of Materials
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