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Solution


Q.

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:          [2025]
1 (A) is correct but (R) is not correct.  
2 Both (A) and (R) are correct but (R) is not the correct explanation of (A).  
3 Both (A) and (R) are correct and (R) is the correct explanation of (A).  
4 (A) is not correct but (R) is correct.  

Ans.

(4)

A: Net dipole moment of polar dielectric substance is zero in absence of electric field as dipoles are randomly oriented.

R: If E→ is absent, polar dielectric remain polar and are randomly oriented.

(A) is not correct but (R) is correct.