MCQ
For ferromagnetic material, the relative permeability $({\mu _r})$, versus magnetic intensity $ (H)$ has the following shape
- A
- B
- C
- ✓
✓
Answer
Correct option: D.
d
(d)${\mu _r} = 1 + \frac{I}{H}$; as we know $I$ 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 speedily. When material fully magnetised $ I$ becomes constant then with the increase of $H$ ($\frac{I}{H}$ decreases) $\mu_r$ decreases. This is confirm with the option $(d).$
(d)${\mu _r} = 1 + \frac{I}{H}$; as we know $I$ 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 speedily. When material fully magnetised $ I$ becomes constant then with the increase of $H$ ($\frac{I}{H}$ decreases) $\mu_r$ decreases. This is confirm with the option $(d).$
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