Coercivity & retentivity (Permanent & electromagnets) | Magnetism & matter | Physics | Khan Academy
Channel: Khan Academy India - English
Date: 2021-05-07

Ferromagnets with high retentivity and coercivity are used as permanent magnets (hard magnets), while the ones with low retentivity & coercivity (soft magnets) are used as cores in electromagnets. But all ferromagnets have high permeability. 
Let's explore these differences between the permanent magnets and the ones used in electromagnets, by looking at their hysteresis loops. 

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