The relative permeability of a dielectric is defined in terms of the magnetic permeability 
,permeability of free space 
and magnetic susceptibility 
by
(Bekefi and Barrett 1987, p. 420).
The corresponding quantity for electricity is called the dielectric constant
,permeability of free space and magnetic susceptibility by(Bekefi and Barrett 1987, p. 420).
The corresponding quantity for electricity is called the dielectric constant
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