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

Question

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Answer 1

The retentivity measures the induced magnetic field at which applied field is zero.

So, Retentivity $= O A = 1.0 T$

Co-ercivity is the resistance of a ferromagnetic material to become demagnetized $= O C = 50 A / m$ .
$∴$ Co-ercivity $= 50 A / m$

At saturation magnetization; graph becomes horizontal
So, saturation magnetization $= M_{s} = 1.5 T$

option (D) is correct.

Answer 2

The retentivity measures the induced magnetic field at which applied field is zero.

So, Retentivity

= O A = 1.0 T

Co-ercivity is the resistance of a ferromagnetic material to become demagnetized

= O C = 50 A / m

.

∴

Co-ercivity

= 50 A / m

At saturation magnetization; graph becomes horizontal

So, saturation magnetization

= M_{s} = 1.5 T

option (D) is correct.