A) \[{{200}^{o}}C\]
B) \[{{400}^{o}}C\]
C) \[{{600}^{o}}C\]
D) \[{{800}^{o}}C\]
Correct Answer: D
Solution :
When a ferromagnetic material is heated above a certain temperature (called Curie temperature), the exchange coupling suddenly disappears. The substance, therefore starts behaving as paramagnetic. Curie temperature for iron is about 800K. Note For cobalt, it is 1375 K and for nickel, the curie temperature is 625 K.
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