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Q.
Iron is ferromagnetic
AMUAMU 2001
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 $1043\, K \left(770^{\circ} C \right)$, hence iron is ferromagnetic above $770^{\circ} C$.