Question

The figure gives experimentally measured B vs. H variation in a ferromagnetic material. The retentivity, co-ercivity and saturation, respectively, of the material are :

A
$$1.5 T, 50 A/m $$ and $$1.0T$$
B
$$150 A/m, 1.0 T$$ and $$1.5 T$$
C
$$1.5 T, 50 A/m$$ and $$1.0 T$$
D
$$1.0 T, 50 A/m$$ and $$1.5 T$$
Solution
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Correct option is D. $$1.0 T, 50 A/m$$ and $$1.5 T$$
The retentivity measures the induced magnetic field at which applied field is zero.

So, Retentivity $$= OA = 1.0T$$

Co-ercivity is the resistance of a ferromagnetic material to become demagnetized $$= OC = 50 A/m$$.
$$\therefore $$ Co-ercivity $$= 50 A/m$$

At saturation magnetization; graph becomes horizontal
So, saturation magnetization $$= M_s = 1.5 T$$

option (D) is correct.

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