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(B) When a ferromagnetic material is heated above its $Curie$ temperature $(T_C)$,the thermal energy of the atoms becomes sufficient to overcome the e

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ferromagnetic domains become random.

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(B) When a ferromagnetic material is heated above its $Curie$ temperature $(T_C)$,the thermal energy of the atoms becomes sufficient to overcome the exchange coupling forces that keep the magnetic moments aligned within the domains.As a result,the ordered magnetic domains are destroyed,and the magnetic moments become randomly oriented due to thermal agitation.Consequently,the material loses its ferromagnetic properties and transforms into a paramagnetic material.Therefore,the correct statement is that the ferromagnetic domains become random.

$A$ ferromagnetic material is heated above its $Curie$ temperature. The correct statement from the following is that

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