The macroscopic quantity 
defined such that
where B is the magnetic field and H is the auxiliary magnetic field.
In cgs,
where
is the magnetic susceptibility, and in MKS
where
is the permeability of free space.
The so-called relative permeability is defined in terms of the magnetic permeability and magnetic susceptibility by
(Bekefi and Barrett 1987, p. 420).
defined such that (1)
where B is the magnetic field and H is the auxiliary magnetic field.
In cgs,
(2)
where
is the magnetic susceptibility, and in MKS(3)
where
is the permeability of free space.The so-called relative permeability is defined in terms of the magnetic permeability
and magnetic susceptibility by (4)
(5)
(Bekefi and Barrett 1987, p. 420).
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