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. 1
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