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A substance whose relative permeability is less than the permeability of free space is?

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A substance whose relative permeability is less than the permeability of free space is?

(a) Diamagnetic

(b) Paramagnetic

(c) Ferromagnetic

(d) Not a magnetic substance

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

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Right choice is (a) Diamagnetic

The explanation is: A diamagnetic material creates a magnetic field opposing that of the external magnetic field and it repels the external magnetic field. Hence its relative permeability is less than that of the free space.

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