POLARIZATION IN NON POLAR MOLECULE -- ELECTRIC POLARIZATION -- DIELECTRIC POLARIZATION
Let us consider an atom placed inside an electric field. The centre of positive charge is displaced along the applied field direction while the centre of negative charge is displaced in the opposite direction. Thus a dipole is produced. When a dielectric material is placed inside an electric field such dipole are created in all the atoms inside. This process of producing electric dipoles which are oriented along the field direction is called Electric Polarization of the dielectric.