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under the application of a time varying electric field the induced polarization in a dielectric may be described by the equation:

*P = [(Ne^2)/(-m(omega)^2-im(omega)(gamma)+k)][E+(1/3(permittivity))P]*

where the electric field at an electron within the dielectric is seperated into the macroscopic field,

*E*, and the field due to the medium polarization,

*(1/3(permutivity))P*. with reference to vector calculus and the physics involved, describe the origin of the second mentioned term.

the book mentions nothing on the vector calc involved, and looking online isn't panning out to well.

cheers for your help!