A) a ferromagnetic substance becomes paramagnetic
B) a paramagnetic substance becomes diamagnetic
C) a diamagnetic substance becomes paramagnetic
D) a paramagnetic substance becomes ferromagnetic
Correct Answer: A
Solution :
| [a] 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. |
| Note: The Curie temperature of iron is \[{{770}^{o}}C\] and that of nickel in \[{{358}^{o}}C\]. |
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