Last Updated on April 17, 2025 by XAM CONTENT
Hello students, we are providing assertion reason questions for class 12. Assertion Reason questions are the new question format that is introduced in CBSE board. The resources for assertion reason questions are very less. So, to help students we have created chapterwise assertion reason questions for class 12 physics. In this article, you will find assertion reason questions for CBSE class 12 physics Chapter 1 Electric Charges and Fields. It is a part of Assertion Reason Questions for CBSE class 12 physics Series.
| Chapter | Electric Charges and Fields |
| Type of Questions | Assertion Reason Questions |
| Nature of Questions | Competency Based Questions |
| Board | CBSE |
| Class | 12 |
| Subject | Physics |
| Useful for | Class 12 Studying Students |
| Answers provided | Yes |
| Difficulty level | Mentioned |
| Important Link | Class 12 Physics Chapterwise Assertion Reason |
Assertion Reason Questions on Electric Charges and Fields
Assertion Reason Questions
Directions:
In the questions given below, there are two statements marked as Assertion (A) and Reason (R).
Read the statements carefully and choose the correct option:
(A) Both A and R are true, and R is the correct explanation of A.
(B) Both A and R are true, but R is not the correct explanation of A.
(C) A is true, but R is false.
(D) A is false, but R is true.
Q1. Assertion (A): A charged body attracts an uncharged insulator.
Reason (R): The electric field of the charged body polarises the insulator.
Ans. Option (A) is correct.
Explanation: The charged body induces a charge separation in the insulator (polarisation), resulting in net attraction. The reason correctly explains the assertion.
Difficulty Level: Medium
Q2. Assertion (A): The electric field inside a uniformly charged hollow spherical conductor is zero.
Reason (R): According to Gauss’s law, the net electric flux through a Gaussian surface inside the shell is zero.
Ans. Option (A) is correct.
Explanation: Since no charge is enclosed within the Gaussian surface inside the shell, electric field is zero there. Reason perfectly explains the assertion.
Difficulty Level: Hard
Q3. Assertion (A): Electric field is always normal to the surface of a charged conductor.
Reason (R): If electric field were not normal, charges would move on the surface and equilibrium would not be maintained.
Ans. Option (A) is correct.
Explanation: At electrostatic equilibrium, electric field is always perpendicular to the surface; otherwise, tangential components would cause charge movement.
Difficulty Level: Medium/Hard
Q4. Assertion (A): Electric flux through a closed surface depends on the total charge enclosed within the surface and not on the distribution of charge outside it.
Reason (R): Electric field due to external charges has zero net flux through the closed surface.
Ans. Option (A) is correct.
Explanation: Gauss’s Law states that electric flux depends only on the enclosed charge. External fields enter and exit equally, so net flux due to them is zero.
Difficulty Level: Medium
Q5. Assertion (A): Coulomb’s law is valid only for point charges in vacuum.
Reason (R): The Coulomb force depends on the nature of the medium between charges.
Ans. Option (B) is correct.
Explanation: While Coulomb’s law is generally stated for point charges in vacuum, it can be modified for medium using permittivity. Reason is true but not a full explanation of the assertion.
Difficulty Level: Medium
Also check
- Current Electricity Class 12 Assertion Reason Questions Physics Chapter 3
- Electrostatic Potential and Capacitance Class 12 Assertion Reason Questions Physics Chapter 2
- Electric Charges and Fields Class 12 Assertion Reason Questions Physics Chapter 1
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Topics from which assertion reason questions may be asked
- Electric charge
- Coulomb’s law
- Electric field
- Gauss’s law
Electric charge is the foundation of electromagnetism — one of nature’s fundamental forces.
Assertion reason questions from the above given topic may be asked.
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Frequently Asked Questions (FAQs) on Electric Charges and Fields Assertion Reason Questions Class 12
Q1: What concepts are covered in Electric Charges and Fields?
A1: This chapter focuses on fundamental concepts related to electric charges and fields.
Q2: What are assertion reason questions?
A2: These consist of an assertion and a reason. Students must assess both for correctness and logical relation.
Q3: Are assertion reason questions part of Class 12 Physics exams?
A3: Yes, they are competency-based and included in CBSE exams.
Q4: How to approach assertion reason questions in Electric Charges and Fields?
A4: Understand each concept clearly and analyze both statements critically in context of Electric Charges and Fields.
