Question

the SI unit of electric polarisation

Answer 1

the S I unit of polarization is C / cm²

Answer 2

Usually, electronic materials have a permanent electric dipole moments, the vector field expression of concentration of a stable electric dipole moments is called the electric potential polarization.

Polarization occurs when an electric field twists the negative cloud of electrons round the positive atomic nuclei in a direction reverse the field. 

The scientifically acknowledged unit of electrical polarization is coulombs/ square meters.