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(A) The Curie temperature $(T_C)$ is a characteristic property of ferromagnetic materials.At temperatures below the Curie temperature,the magnetic mom

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a ferromagnetic material becomes paramagnetic

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(A) The Curie temperature $(T_C)$ is a characteristic property of ferromagnetic materials.At temperatures below the Curie temperature,the magnetic moments in a ferromagnetic material are aligned due to exchange interaction,resulting in spontaneous magnetization.As the temperature increases,thermal agitation disrupts this alignment.When the temperature exceeds the Curie temperature $(T > T_C)$,the thermal energy becomes sufficient to overcome the exchange interaction,causing the material to lose its spontaneous magnetization and behave as a paramagnetic material.Therefore,above the Curie temperature,a ferromagnetic material becomes paramagnetic.

Curie temperature is the temperature above which

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