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(B) From the given hysteresis loop:$1$. Retentivity is the value of magnetic induction $B$ when the magnetizing field $H = 0$. From the graph,at $H =

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$1.0 \ T, 50 \ A/m$ and $1.5 \ T$

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(B) From the given hysteresis loop:$1$. Retentivity is the value of magnetic induction $B$ when the magnetizing field $H = 0$. From the graph,at $H = 0$,$B = 1.0 \ T$.$2$. Coercivity is the value of the reverse magnetizing field $H$ required to reduce the magnetic induction $B$ to zero. From the graph,at $B = 0$,$H = 50 \ A/m$ (magnitude).$3$. Saturation magnetic field is the maximum value of $B$ reached in the loop. From the graph,the maximum value is $1.5 \ T$.Therefore,the values are $1.0 \ T, 50 \ A/m$ and $1.5 \ T$.

The figure shows the experimentally measured $B$ vs $H$ variation in a ferromagnetic material. The values of retentivity,coercivity,and saturation magnetic field of the material are respectively:

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