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

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

(a) Diamagnetic

(b) Paramagnetic

(c) Ferromagnetic

(d) Not a magnetic substance

This question was posed to me during an online interview.

This intriguing question originated from Permeability of Free Space or Magnetic Constant in portion Simple Magnetic Circuits of Basic Electrical Engineering

1 Answer

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Best answer
Right choice is (a) Diamagnetic

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

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