Ferromagnetic subtances make permanent magnets. Give reason.

1.	Ferromagnetic subtances make permanent magnets. Give reason.
Answer» SOLUTION :When ferromagnetic subtances ( 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 subtance 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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