A) super conducting
B) ferromagnetic
C) diamagnetic
D) radioactive
Correct Answer: B
Solution :
Key Idea: 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 \[{{770}^{o}}C.\]
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