Materials Measurement Phil Bartley Shelley Begley

Constitutive RelationsD=εEB=µ HJ=σEOther factors that make the solution unique to a particular situation are the boundaryconditions and the satisfaction of the following constitutive relations. e, u, and s are,respectively, the permittivity, permeability and conductivity of the media. These arecommonly referred to as the electromagnetic properties of the material. Manymaterials are non-magnetic. The consequence of this is that µ is known. At highfrequencies, the effect of σ can be ignored. This is because its effect varies inverselywith frequency. This is true for most non-conductive materals. The exception is formetals.7