Polarization when associated with electric fields?

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varunsarda88
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Can any 1 please help me out with this...i'm not able to understand the term polarization when associated with electric fields??
 

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Acting on a dielectric, an electric field polarizes the molecules by stretching the positive charges and negaive charges in opposite directions.
This gives each molecule an electric dipole moment.
A polarization vector P is introduced that is equal to the dipole moment per unit volume.
 
heythanx a lot..
 

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