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NEET UG PHYSICS MCQ: ELECTRIC FIELDS AND CHARGES
1
Hard
1 of 1
Analyzing
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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:
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:
View answer and explanation
Correct option: D
(A) is not correct but (R) is correct
The correct answer is D because the assertion is false; a polar dielectric has zero net dipole moment in the absence of an external field due to random orientation of dipoles. The reason is correct.
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