Assertion : In the absence of an external ele | vedclass

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(A) polar dielectric consists of molecules that have a permanent electric dipole moment.In the absence of an external electric field,these dipoles are

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If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

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(A) polar dielectric consists of molecules that have a permanent electric dipole moment.In the absence of an external electric field,these dipoles are randomly oriented due to thermal agitation.Because of this random orientation,the vector sum of the dipole moments of all molecules in a given volume is zero.Therefore,the net dipole moment per unit volume (polarization $\vec{P}$) is zero.Since the Reason correctly explains that the random orientation leads to the cancellation of individual dipole moments,the Reason is the correct explanation of the Assertion.

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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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.