Iron loses its magnetic property at:

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(C) Iron is a ferromagnetic material. When heated above a specific temperature known as the Curie point $(T_C)$,the thermal energy becomes sufficient

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Curie point

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(C) Iron is a ferromagnetic material. When heated above a specific temperature known as the Curie point $(T_C)$,the thermal energy becomes sufficient to overcome the exchange interactions that align the magnetic moments. Consequently,iron loses its ferromagnetic property and becomes paramagnetic at temperatures above the Curie point.

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