(D) Polar molecules are those in which the centres of positive and negative charges do not coincide,even in the absence of an external electric field.

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having a permanent electric dipole moment.

(D) Polar molecules are those in which the centres of positive and negative charges do not coincide,even in the absence of an external electric field.Because these centres are separated by a small distance,these molecules possess a permanent electric dipole moment.

Class 12 Physics Electric Potential and Capacitance Dielectric and Polarisation

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Polar molecules are the molecules:

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A
having zero dipole moment.
B
acquire a dipole moment only in the presence of electric field due to displacement of charges.
C
acquire a dipole moment only when magnetic field is absent.
D
having a permanent electric dipole moment.