State the SI unit

A Dielectric develops a net dipole moment in the presence of an external field whether it is polar or non-polar. The dipole moment per unit volume is called Polarization and is denoted by P. For

linear isotropic dielectrics,

P =X_eE

where X_e is a constant characteristic of the dielectric and is known as the electric susceptibility of the dielectric medium so the SI unit of the electric polarization vector P is coulombs per square meter (Cm^-2).