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JEE Main 20252 AprilEvening Shift
Exam
JEE Main
Year
2025
Date
2 April
Shift
Evening Shift
Subject
Physics
Chapter
Electrostatics

JEE Main 2025 · 2 April · Evening Shift · Physics · Electrostatics

Given below are two statements : one is labelled as Assertion (A)...

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 :

Options

  1. A(A) is correct but (R)(\mathrm{R}) is not correct
  2. BBoth (A)(\mathrm{A}) and (R)(\mathrm{R}) are correct but (R)(\mathrm{R}) is not the correct explanation of (A)
  3. CBoth (A) and (R) are correct and (R) is the correct explanation of (A)
  4. D(A) is not correct but (R)(\mathrm{R}) is correct

Correct answer

D. (A) is not correct but (R)(\mathrm{R}) is correct

Step-by-step solution

A : Since polar dielectrics are randomly oriental P→net=0→\overrightarrow{\mathrm{P}}_{\mathrm{net}}=\overrightarrow{0}.
R : If E→\overrightarrow{\mathrm{E}} is absent, polar dielectric remain polar \& are randomly oriented.
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