| Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as: |
| Assertion (A): In the absence of an external electric field, the dipole moment per unit volume of a polar dielectric is zero. |
| Reason (R): The dipoles of a polar dielectric are randomly oriented. |
A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A)
B) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A)
C) Assertion (A) is true but Reason (R) is false
D) Assertion (A) is false and Reason (R) is also false
Correct Answer: A
Solution :
(a) 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.
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