**Polarization**.

The polarisation of a region is defined as the dipole moment per unit volume.

For linear isotropic dielectrics, it is given by

$P=χ_{e}E$

where $χ_{e}$ is the dielectric susceptibility of the dielectric medium

Physics

The polarisation of a region is defined as the dipole moment per unit volume.

For linear isotropic dielectrics, it is given by

$P=χ_{e}E$

where $χ_{e}$ is the dielectric susceptibility of the dielectric medium

where

$χ:$ Electric susceptibility of the medium

$E:$ External electric field

Electric susceptibility is related to the molecular properties of the substance.

It is also given by:

$χ=ε_{o}(K−1)$

where $K:$ dielectric constant of the medium