The relative permeability (mu_r) of a ferroma | vedclass

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(C) For a ferromagnetic substance,the relative permeability $(\mu_r)$ is very large at low temperatures.As the temperature $(T)$ increases,the thermal

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$C$

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(C) For a ferromagnetic substance,the relative permeability $(\mu_r)$ is very large at low temperatures.As the temperature $(T)$ increases,the thermal agitation of the atoms increases,which opposes the alignment of magnetic dipoles.When the temperature reaches the Curie temperature $(T_c)$,the substance undergoes a phase transition from ferromagnetic to paramagnetic.Above the Curie temperature $(T_c)$,the substance behaves as a paramagnetic material,for which the relative permeability $(\mu_r)$ is slightly greater than $1$ and remains nearly constant with further increases in temperature.Curve $C$ correctly represents this behavior,where $\mu_r$ is high at low temperatures and decreases to a value slightly above $1$ at $T = T_c$,remaining constant thereafter.

The relative permeability $(\mu_r)$ of a ferromagnetic substance varies with temperature $(T)$ according to the curve shown in the figure.

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