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(D) The relative permeability is given by the relation $\mu_r = 1 + \chi_m$,where $\chi_m = \frac{I}{H}$ is the magnetic susceptibility.Thus,$\mu_r =

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(D) The relative permeability is given by the relation $\mu_r = 1 + \chi_m$,where $\chi_m = \frac{I}{H}$ is the magnetic susceptibility.Thus,$\mu_r = 1 + \frac{I}{H}$.For a ferromagnetic material,the intensity of magnetization $I$ is not linearly proportional to the magnetic intensity $H$.Initially,as $H$ increases,$I$ increases rapidly,causing the ratio $\frac{I}{H}$ to increase,which leads to an increase in $\mu_r$.As $H$ increases further,the material approaches magnetic saturation,meaning $I$ increases more slowly. Consequently,the ratio $\frac{I}{H}$ begins to decrease,leading to a decrease in $\mu_r$.Therefore,the graph of $\mu_r$ versus $H$ shows an initial increase followed by a decrease,which corresponds to the shape shown in option $(d)$.

List-$I$	List-$II$
$(A)$ Magnetic field intensity	$(i)$ $Wb$
$(B)$ Magnetic flux	(ii) $Wb \cdot m^{-2}$
$(C)$ Magnetic pole strength	(iii) $A \cdot m$
$(D)$ Magnetic induction	(iv) $A \cdot m^{-1}$

For a ferromagnetic material,the relative permeability $(\mu_r)$ versus magnetic intensity $(H)$ has the following shape:

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