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What is the representation of permeability?

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What is the representation of permeability?

(a) coercivity/retentivity

(b) flux/flux density

(c) magnetic force/magnetic flux density

(d) magnetic flux density/magnetic force

I had been asked this question during an internship interview.

I would like to ask this question from Magnetic Materials topic in portion Electrical Engineering Materials of Design of Electrical Machines

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Correct choice is (d) magnetic flux density/magnetic force

The best explanation: Permeability is the property which deals, with the relationship with magnetic flux density and magnetic force. Magnetic force/Magnetic flux density deals with the reciprocal of permeability. Coercivity/Retentivity deals with the terms of B-H curve.

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