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 $$1.5 T$$
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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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