A) below \[770{}^\circ C\]
B) above \[770{}^\circ C\]
C) at NTP only
D) at all temperature
Correct Answer: B
Solution :
The curie temperature is an essential temperature of ferromagnetic material. If a ferromagnetic material has a temperature under its curie temperature, then the material has a net spontaneous magnetisation. The curie temperature of iron is 1043 K \[({{770}^{o}}C)\], hence iron is ferromagnetic above \[{{770}^{o}}C\].
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