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.

Question

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. (A) Both Assertion and Reason are correct and Reason is the correct explanation of Assertion. (B) Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion. (C) Assertion is correct but Reason is incorrect. (D) Assertion is incorrect but Reason is correct.

Tardigrade Admin · Accepted Answer

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.

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.

Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.

Assertion is correct but Reason is incorrect.

Assertion is incorrect but Reason is correct.

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.

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.