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Basic Knowledge of Polarisation of Dielectrics




When an electric field is applied there is small displacement of bound charges creating small  electric dipoles within the dielectric. This phenomenon is called Polarization.
The polarisation of a region is defined as the dipole moment per unit volume.
For linear isotropic dielectrics, it is given by 

where is the dielectric susceptibility of the dielectric medium


Electric susceptibility

Polarisation in a dielectric is given by:
Electric susceptibility of the medium
External electric field
Electric susceptibility is related to the molecular properties of the substance.
It is also given by:

where dielectric constant of the medium