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  4. Assertion: Polar molecules have permanent dipole moment Reason: In polar molecule, the centres of positive and negative charges coincide even when there is no external field

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Q. Assertion : Polar molecules have permanent dipole moment
Reason : In polar molecule, the centres of positive and negative charges coincide even when there is no external field

Electrostatic Potential and Capacitance

Solution:

The molecules of a substance may be polar or non-polar. In a non-polar molecule, the centres of positive and negative charges coincide. This molecule has no permanent dipole moment. On the other hand, a polar molecule is one in which the centres of positive and negative charges are separated, even when there is no external field. Such molecules have a permanent dipole moment