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Hπd+Bbμ0=NI or, B=μ0NIb−μ0πdbH=(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=Bμ0H≈4000.

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