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Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.
Assertion : In the absence of an external electric field, the dipole moment per unit volume of a polar dielectric is zero.
Reason : The dipoles of a polar dielectric are randomly oriented.
  • a)
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • b)
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  • c)
    If the Assertion is correct but Reason is incorrect.
  • d)
    If both the Assertion and Reason are incorrect.
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Directions: These questions consist of two statements, each printed a...
There are polar and non polar dielectric materials. The molecules of a polar dielectric have a permanent dipole moment . However due to random orientations net dipole moment is zero. If there is no external electric field , there is no polarishation.
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Directions: These questions consist of two statements, each printed a...
Assertion: In the absence of an external electric field, the dipole moment per unit volume of a polar dielectric is zero.

Reason: The dipoles of a polar dielectric are randomly oriented.

Correct Answer: Option A - If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

Explanation:
The given assertion states that in the absence of an external electric field, the dipole moment per unit volume of a polar dielectric is zero. The reason provided is that the dipoles of a polar dielectric are randomly oriented. Let's analyze this statement and reason in detail.

Understanding the Assertion:
A polar dielectric is a material that has permanent dipole moments due to the presence of polar molecules. These molecules have a positive and negative charge separated by a distance, creating a dipole. The dipole moment per unit volume refers to the overall dipole moment present in a given volume of the dielectric material.

The assertion states that in the absence of an external electric field, the dipole moment per unit volume is zero. This means that on average, the dipole moments within the material cancel each other out, resulting in a net dipole moment of zero in a given volume.

Understanding the Reason:
The reason provided states that the dipoles of a polar dielectric are randomly oriented. This means that the orientations of the dipole moments within the material are not aligned in any specific direction but are distributed randomly.

Explanation of the Correct Answer:
The correct answer is option A because both the assertion and reason are correct, and the reason correctly explains the assertion.

In the absence of an external electric field, the dipoles of a polar dielectric experience thermal motion and collide with each other, causing their orientations to become randomized. As a result, the individual dipole moments cancel each other out on average, leading to a net dipole moment per unit volume of zero.

This phenomenon is known as randomization or random orientation of dipoles in a polar dielectric. It occurs due to the absence of any external influence that can align the dipoles in a specific direction.

Therefore, in the absence of an external electric field, the polar dielectric does not exhibit any overall dipole moment per unit volume, which is correctly explained by the random orientation of dipoles within the material.

Conclusion:
In conclusion, the assertion that the dipole moment per unit volume of a polar dielectric is zero in the absence of an external electric field is correct. This is explained by the fact that the dipoles of a polar dielectric are randomly oriented, leading to the cancellation of individual dipole moments on average.
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Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.Assertion : In the absence of an external electric field, the dipole moment per unit volume of a polar dielectric is zero.Reason : The dipoles of a polar dielectric are randomly oriented.a)If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.b)If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.c)If the Assertion is correct but Reason is incorrect.d)If both the Assertion and Reason are incorrect.Correct answer is option 'A'. Can you explain this answer?
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Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.Assertion : In the absence of an external electric field, the dipole moment per unit volume of a polar dielectric is zero.Reason : The dipoles of a polar dielectric are randomly oriented.a)If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.b)If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.c)If the Assertion is correct but Reason is incorrect.d)If both the Assertion and Reason are incorrect.Correct answer is option 'A'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.Assertion : In the absence of an external electric field, the dipole moment per unit volume of a polar dielectric is zero.Reason : The dipoles of a polar dielectric are randomly oriented.a)If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.b)If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.c)If the Assertion is correct but Reason is incorrect.d)If both the Assertion and Reason are incorrect.Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.Assertion : In the absence of an external electric field, the dipole moment per unit volume of a polar dielectric is zero.Reason : The dipoles of a polar dielectric are randomly oriented.a)If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.b)If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.c)If the Assertion is correct but Reason is incorrect.d)If both the Assertion and Reason are incorrect.Correct answer is option 'A'. Can you explain this answer?.
Solutions for Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.Assertion : In the absence of an external electric field, the dipole moment per unit volume of a polar dielectric is zero.Reason : The dipoles of a polar dielectric are randomly oriented.a)If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.b)If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.c)If the Assertion is correct but Reason is incorrect.d)If both the Assertion and Reason are incorrect.Correct answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 12. Download more important topics, notes, lectures and mock test series for Class 12 Exam by signing up for free.
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