When a piece of a ferromagnetic substance is put in a uniform magnetic field, the flux density inside it is four times the flux density away from the piece. The magnetic permeability of the material(in $N/A^{2}$) is

Question

Dr. Abubacker · Accepted Answer

(d) Permeability is given by
$\mu = \frac{B}{H}$
When B is magnetic flux density and H the auxiliary field strength.
Given, $B = 4H,$
$	herefore\ \mu = \frac{4H}{H} = 4NA^{- 2}$

Q. When a piece of a ferromagnetic substance is put in a uniform magnetic field, the flux density inside it is four times the flux density away from the piece. The magnetic permeability of the material(in $N/A^{2}$) is

Explanation

Reviewed by Dr. Abubacker

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