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QPage 285: Q5: HC Verma: Concepts of Physics - Volume 2 Magnetic Properties of Matter Page 285: Q5 Solution: Why is it not possible to make permanent magnets from…

Why is it not possible to make permanent magnets from paramagnetic materials?

Step-by-Step Verified Solution

**Answer:** It is not possible to make permanent magnets from paramagnetic materials because they have weak magnetisation and lose their magnetism easily. **Step-by-Step Explanation:** Paramagnetic materials have a weak positive susceptibility (0<χ≪10 < \chi \ll 1). Their atomic magnetic moments are only weakly aligned by an external field. When the external field is removed, thermal agitation quickly randomises the moments, and the magnetisation disappears. They also have low retentivity and low coercivity. Hence, they cannot be used to make permanent magnets.

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