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0 votes
11.0k views
in Physics by (30.7k points)

Polar molecules are the molecules :

(1) having zero dipole moment. 

(2) acquire a dipole moment only in the presence of electric field due to displacement of charges. 

(3) acquire a dipole moment only when magnetic field is absent. 

(4) having a permanent electric dipole moment.

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2 Answers

+1 vote
by (30.6k points)

Option : (4) having a permanent electric dipole moment.

Polar molecules have centres of positive and negative charges separated by some distance, so they have permanent dipole moment.

0 votes
by (65 points)
In polar molecules, the centre of positive charges does not coincide with the centre of negative charges.

Hence, these molecules have a permanent electric dipole moment of their own.

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