In the presence of electronic, ionic and dipolar polarization mechanisms, the average induced dipole moment per molecule will be the sum of all the contributions in terms of the local field. Each effect had linearly to the net dipole moment per molecule, a fact verified by experiments. Similarly the dielectric constant under electronic and ionic polarizations, however, can be obtained from. In addition, we cannot use the simple Lorentz field approximation for dipolar materials. That, is the clausius _mossotti equation does not work with dipolar dielectrics and the calculation of the local field is quite complicated.