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Q.
For ferromagnetic material, the relative permeability $\left(\mu_{r}\right)$ versus magnetic intensity $(H)$ has which of the following shape?
Magnetism and Matter
Solution:
$\mu_{r}=1+\frac{I}{H} ;$ as we know $I$ is dependent on $H$, initially
value of $\frac{I}{H}$ is smaller so value of $\mu_{r}$ increases with
$H$ but slowly but with further increases of $H$ value of $\frac{I}{H}$ also increases i.e., $\mu_{r}$ increases rapidly. When
material is fully magnetised $I$ becomes constant, then with the increase of $H\left(\frac{I}{H}\right.$ decreases) $\mu_{r}$ decreases.