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  4. Assertion In the absence of an external electric field, the dipole moment per unit volume of a polar dielectric is zero. Reason The dipoles of a polar dielectric are randomly oriented.

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Q. Assertion In the absence of an external electric field, the dipole moment per unit volume of a polar dielectric is zero.
Reason The dipoles of a polar dielectric are randomly oriented.

Electrostatic Potential and Capacitance

Solution:

There are polar and non-polar dielectric materials. The molecules of a polar dielectric have a permanent dipole moment. However, due to random orientations net dipole moment is zero. If there is no external electric field, there is no polarisation.