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(A) The magnetic permeability $\mu$ of a substance is defined as the ratio of the magnetic flux density $B$ to the magnetizing field $H$,given by $\mu

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decreases

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(A) The magnetic permeability $\mu$ of a substance is defined as the ratio of the magnetic flux density $B$ to the magnetizing field $H$,given by $\mu = \frac{B}{H}$.For a ferromagnetic material,as the magnetizing field $H$ increases,the magnetic flux density $B$ increases initially but eventually reaches a state of magnetic saturation. Since $B$ approaches a constant saturation value while $H$ continues to increase,the ratio $\mu = \frac{B}{H}$ decreases as $H$ increases. Therefore,the permeability of a ferromagnetic material decreases with an increase in the magnetizing field.

If the magnetizing field on a ferromagnetic material is increased,its permeability

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