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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.

Electric Charges and Fields

Solution:

Correct answer is (a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.