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 :
Select the correct option:
A
(A) is correct but (R) is not correct
B
Both (A) and (R) are correct and (R) is the correct explanation of (A)
C
Both (A) and (R) are correct but (R) is not the correct explanation of (A)
D
(A) is not correct but (R) is correct
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
A : Since polar dielectrics are randomly oriental $\vec{P}_{n e t}=\overrightarrow{0}$.
R : If $\vec{E}$ is absent, polar dielectric remain polar & are randomly oriented.
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