Which Molecule Type is More Polarizable in a Uniform Electric Field?

[Quotes]

Which of them
1.Polar Dielectric molecule
2. Non Polar molecule
Will get polarized to a greater extent when kept in a uniform electric field?
(I think its the 2nd one because force applied has to stretch the positive and negative charge centres apart to polarise it.. But at the same time for polar molecule we have to in addition rearrange to get a net dipole moment)
Its really ll getting confusing... Please explain.
Thanks in advance

 

[nilesh_pat]

Answer: The first one, the polar dielectric molecule, will get polarized to a greater extent when kept in a uniform electric field. This is because the molecule already has an asymmetrical charge distribution, so when an external electric field is applied it will cause the charges to rearrange themselves and create a net dipole moment. In contrast, non-polar molecules do not have an asymmetrical charge distribution, so even when an electric field is applied the molecules cannot become polarized.