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Dielectric Properties

Based on the dielectric properties it is possible to determine whether or not a material can be categorized as a simple medium.

Given the equation of polarization density P:

P = ε0 · Xe · E

where:
ε0: electric permittivity of free space
Xe: electric susceptibility
E: electric field

A material can have one or more of the following characteristics.

Linear: if the electric susceptibility is independent of E.
Isotropic: If the polarization has the same direction as E.
Homogenous: If the susceptibility is independent of space coordinates.

A material is a simple medium if all three properties are satisfied.
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