Complex permittivity polar fluids

If the concentration of an electrolyte is rather low, then at least three elementary types of motion stipulate dispersion of the complex permittivity in this polar fluid ... 

As distinct from pure electrodynamics and pure mechanics, the complex permittivity e(v) of a polar fluid is determined by self-consistent interrelation of Maxwell and Newton equations. Indeed, trajectories of the particles depends on applied electromagnetic field E(t). Since the latter disturbs these trajectories, they are not known a priori. 

---