The
internal field in a 3-dimensional solid is determined by the structure of the
solid. It is very difficult to calculate the accurate internal field in solids
but the general expression for Ei is
very much similar to that given by equation (vi).
Q.6 Derive Clausius-Mossotti Equation in terms
of relative permittivity. (AKTU. 2009-10)
Ans. The electric field acting at the site of an atom or molecule is,
in general different from the macroscopic electric field and is called the
local field. This field
.............(viii)