Assertion and reason on polar and non-polar dielectric molecules

This type of question, asked 2 times: 26 Jun 2022, 2 Apr 2025. All 2 questions below, oldest first.

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Question 1
26 Jun 2022
11 $Assertion (A): Non-polar materials do not have any permanent dipole moment. Reason (R): When a non-polar material is placed in an electric field, the centre of the positive charge distribution of its individual atom or molecule coincides with the centre of the negative charge distribution. In the light of above statements, choose the most appropriate answer from the options given below.$
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Question 2
2 Apr 2025
76 $Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Net dipole moment of a polar linear isotropic dielectric substance is not zero even in the absence of an external electric field. Reason (R) : In absence of an external electric field, the different permanent dipoles of a polar dielectric substance are oriented in random directions. In the light of the above statements, choose the most appropriate answer from the options given below:$
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Question 1