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  4. Curie temperature of iron is the temperature below which it is:

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Q. Curie temperature of iron is the temperature below which it is:

AFMCAFMC 2002

Solution:

The temperature above which the substance becomes paramagnetic is called Curie temperature.
Ferromagnetism decreases with rise in temperature. If we heat a ferromagnetic substance, then at a definite temperature the ferromagnetic property of the substance suddenly disappears and the substance becomes paramagnetic. The temperature above which a ferromagnetic substance becomes paramagnetic is called Curie temperature of the substance. The Curie temperature of iron is $770^{\circ} C$.