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Alternate Titles: electron polarization, electronic polarization. Electric polarization, slight relative shift of positive and negative electric charge in opposite directions within an insulator, or dielectric, induced by an external electric field.
An electric field is the region surrounding a charged particle, Q, where another charged particle with experience either a force of attraction or repulsion. For point charges, the electric field lines are radial, getting ever farther apart as you get farther from the point charge itself.