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
1.5T,50A/m and 1.0T
B
150A/m,1.0T and 1.5T
C
1.5T,50A/m and 1.0T
D
1.0T,50A/m and 1.5T
Hard
JEE Mains
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Updated on : 2022-09-05
Solution
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Correct option is D)
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=50A/m.
∴ Co-ercivity =50A/m
At saturation magnetization; graph becomes horizontal