Magnetic permeability represents the ease with which a material allows magnetic force of lines to pass through it. The permeability of vacuum or free space is denoted by *μ*_{0} and it is taken as the standard with respect to this the permeability of all materials is expressed. The permeability of the medium of a material is denoted as *μ*; it is the product of the permeability of free space (*μ*_{0}) and relative permeability (*μ*_{r}).

∴ *μ* = *μ _{r}μ*

*μ*_{r} is purely a number; it has no units. The permeability of free space is:

*μ*_{0} = 4*π* × 10^{−7} H/M

Let *B* be the magnetic flux density in a magnetic material by applying magnetic field of intensity *H* and *B*_{0} be the flux density at the same place if the material is removed [i.e., in air or vacuum]. ...

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