A) a ferromagnetic substance becomes para- magnetic
B) a paramagnetic substance becomes dia- magnetic
C) a ferromagnetic substance becomes para- magnetic
D) a paramagnetic substance becomes fer- romagnetic
Correct Answer: A
Solution :
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 the Curie temperature of the substance.
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