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Electric polarization ( $P$ )

Electric polarization is electric dipole moment per unit volume. It produces bound volume and surface charge

ρ_{b} = - \nabla \cdot P, σ_{b} = P \cdot n .

Across an interface, the net bound sheet charge is

(P_{1} - P_{2}) \cdot n

, where

n

points from medium one to medium two.

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- Electric displacement field Electric polarization 23

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