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Question

Which type of magnetic behaviour is shown by ‘magnetite’ (Fe3O4)?


A
Ferromagnetism
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B
Ferrimagnetism
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C
Antiferromagnetism
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D
Diamagnetism
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Solution

The correct option is B Ferrimagnetism

Ferrimagnetism arises due to the unequal magnetic moments in opposite direction, resulting net magnetic moment in one direction.
Magnetic moments of the domains are aligned in parallel and anti-parallel directions in unequal numbers
These materials are weakly attracted by magnetic fields as compared to ferromagnetic substances.

On heating, substance loses its ferrimagnetism property and becomes paramagnetic.

Fe3O4, ferrites like MgFe2O4 and ZnFe2O4 are examples of ferrimagnetism.


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