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Ferromagnetic subtances make permanent m...

Ferromagnetic subtances make permanent magnets. Give reason.

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When ferromagnetic substances (like Fe , Co, Ni and `CrO_2`) are placed in a magnetic field , all the domains get oriented in the direction of the magnetic field. As a result, the substance has high magnetic moment. The ordering of domains remains even when the external magnetic field is removed. Hence, the substance remains permanently magnetised.
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