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  4. The basic magnetization curve for a ferromagnetic material is shown in figure. Then, the value of relative permeability is highest for the point.

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Q. The basic magnetization curve for a ferromagnetic material is shown in figure. Then, the value of relative permeability is highest for the point.Physics Question Image

BITSATBITSAT 2017

Solution:

$B =\mu_{0} \mu_{ r } H \Rightarrow \mu_{ r } \propto \frac{ B }{ H }=$ slope $B - H$ curve
According to the given graph, slope of the graph is highest point $Q$.