The unit of magnetic permeability is

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(D) The magnetic permeability $\mu$ is defined by the relation $B = \mu H$,where $B$ is the magnetic flux density and $H$ is the magnetic field intens

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Henry/metre

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(D) The magnetic permeability $\mu$ is defined by the relation $B = \mu H$,where $B$ is the magnetic flux density and $H$ is the magnetic field intensity.Alternatively,from the expression for the inductance of a solenoid,$L = \frac{\mu N^2 A}{l}$,we can write $\mu = \frac{L \cdot l}{N^2 A}$.The unit of inductance $L$ is Henry $(H)$,the unit of length $l$ is metre $(m)$,and the unit of area $A$ is square metre $(m^2)$.Therefore,the unit of $\mu$ is $\frac{H \cdot m}{m^2} = 	ext{Henry/metre}$ $(H/m)$.Thus,the correct option is $D$.

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