Explain effect of frequency of applied electric field.

If an external electric field is applied, the distance among charges that is related to chemical bonding keeps constant in the polarization; though, the polarization itself rotates. Since this rotation completes not instantaneously but in the delay time τ, that depends upon the surrounding local viscosity of the molecules and torque, dipolar polarizations lose the response to electric fields at the lowest frequency in polarizations. The delay of the response to this change of the electric field causes friction and heat.