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Question
The permanent magnetic moment of the atoms of a material is not zero. The material ________________ .
Options
must be paramagnetic
must be diamagnetic
must be ferromagnetic
may be paramagnetic
Solution
may be paramagnetic
Diamagnetic material have zero magnetic moment on their own.
Paramagnetic and ferromagnetic materials have non zero permanent magnetic moment. But we are not sure about the material, whether it is Paramagnetic or ferromagnetic. If the material has large value of permanent magnetic moment, then it will be ferromagnetic and if it has small value of permanent magnetic moment, then it will be Paramagnetic.
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