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Updated on : 2022-09-05

Solution

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Correct option is A)

$Hπd+μ_{0}Bb =NI$ or, $B=bμ_{0}NI −bμ_{0}πd H=(1.51−0.987)H$,

Where $B$ is in Tesla and $H$ in $kA/m$. Besides, $B$ and $H$ are interrelated as in the figure shown below of the text. Thus we have to solve for $B$, $H$ graphically by simultaneously drawing the two curves (the hysterisis curve and the straight line, given above) and find the point of intersection. It is at

$H≈0.26kA/m$, $B=1.25T$

Then $μ=μ_{0}HB ≈4000$.

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