Define the term polarization of a dielectric and write the expression for a linear isotropic dielectric in terms of electric field.

The displacement of positive and negative charges in opposite directions in a dielectric is Polarization. It occurs through the action of an electric field. A linear isotropic dielectric is a dielectric in which the permittivity is a scalar and has an equal value in all directions. In terms of electric field, the expression is K = ε₀/ε, where ε is the net electric field and ε₀ is the external electric field.