Polar molecules are the molecules
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

Solution; Answer (4)

The positive charge centre does not coincide with the negative charge centre in polar molecules. As a result, these molecules have their own permanent electric dipole moment.