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Which of the following expressions is correct with respect to relative permeability?

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Which of the following expressions is correct with respect to relative permeability?

(a) B = µrµ0/H

(b) B = µrµ0H

(c) B = µr/µ0H

(d) B = µrµ0/H^2

I had been asked this question during an interview for a job.

I need to ask this question from Relative Permeability topic in section Simple Magnetic Circuits of Basic Electrical Engineering

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Right answer is (b) B = µrµ0H

For explanation: For a non magnetic material: B=µ0H. Hence for a material having relative permeability µr, B=µrµ0H.

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