CBSE Class 12 Physics Question Bank: Master Electric Charges & Fields and Coulomb’s Law 2026
- Feb 13
- 4 min read
Updated: Feb 13
As the 2026 board exam season approaches, students are increasingly looking for a structured way to tackle the vast syllabus. The first chapter, Electric Charges and Fields, is the foundation of electrostatics and carries significant weightage, especially for those aiming for careers in medicine through NEET or engineering through JEE.
This comprehensive CBSE Class 12 Physics Question Bank is designed to provide you with the most repeated questions, essential formula names, and exam-oriented insights to ensure you stay ahead of the curve.
Why This Chapter is Crucial for 2026
In the updated 2026 curriculum, the emphasis has shifted toward application-based learning. For medical aspirants, understanding how electric fields interact is vital for grasping concepts in medical technology, such as ECGs and neural signaling. The chapter focuses heavily on Coulomb’s Law, the Superposition Principle, and Gauss’s Law.
CBSE Chapter Weightage and Exam Pattern
Based on recent trends from official sample papers, Unit I (Electrostatics) typically accounts for 16 marks in the theory paper. Specifically, Electric Charges and Fields contribute roughly 5 to 8 marks, often including:
One 3-mark derivation.
Two 1-mark Multiple Choice Questions (MCQs).
One 2-mark numerical based on Coulomb’s Law.
Important Question Bank: Section-Wise Breakdown
1. Very Short Answer Questions (1 Mark)
These questions test your fundamental conceptual clarity.
The Quantization of Charge: Why is the quantization of electric charge ignored when dealing with macroscopic charges?
Electric Field Lines: Can two electric lines of force ever intersect? Justify your answer.
Coulomb’s Law in Medium: How does the force between two point charges change if the dielectric constant of the medium between them increases?
Net Flux: If the net outward flux through the surface of a closed box is zero, can we conclude there are no charges inside the box?
2. Short Answer Questions (2 & 3 Marks)
This section of the CBSE Class 12 Physics Question Bank covers derivations and technical reasoning.
Coulomb’s Law in Vector Form: State the law and provide its vector representation to show it obeys Newton’s Third Law.
Electric Dipole: Define the electric dipole moment and its SI unit.
Superposition Principle: Explain how to find the net force on a single point charge surrounded by multiple other charges.
Equilibrium Problems: Find the point on a line joining two charges where the net electric field is zero.
3. Long Answer & Case-Based Questions (5 Marks)
Gauss’s Law Application: Use Gauss’s Law to find the electric field intensity due to an infinitely long straight uniformly charged wire.
Dipole in Uniform Field: Derive the expression for the torque acting on an electric dipole placed in a uniform external electric field.
Medical Application Case Study: A passage discussing how the principles of electric fields are used in medical equipment like defibrillators, followed by questions on capacitance and field strength.
Essential Formula to Remember
To excel in numerical problems, you must be well-versed with the following. Note that for the 2026 exam, you should focus on the application of these names:
Quantization of Charge Formula
Coulomb’s Law (Magnitude and Vector Form)
Electric Field Intensity (Point Charge)
Electric Dipole Moment
Torque on a Dipole
Electric Flux (Gauss’s Theorem)
Field due to Infinite Line Charge
Field due to Infinite Plane Sheet
Field due to Spherical Shell (Inside and Outside)
High-Yield Topics for 2026 Boards
Coulomb’s Law: Specifically, the effect of the dielectric medium and the principle of superposition.
Electric Field Lines: Properties and drawing field lines for various charge configurations.
Gauss’s Law: Derivations involving thin infinite plane sheets and straight wires are highly repeated.
Electric Dipole: Axial vs. Equatorial field intensity (highly likely for 3-mark questions).
Official Links for Preparation
CBSE Official Academic Portal: cbseacademic.nic.in
CBSE Official Academic Portal: cbseacademic.nic.in
CBSE Academic Question Bank: Official CBSE Class 12 Materials
Conclusion
Preparing for the 2026 board exams requires a blend of conceptual depth and rigorous practice. By focusing on this CBSE Class 12 Physics Question Bank, you ensure that you aren't just memorizing formulas but understanding the physical world's behavior. Stick to the NCERT syllabus, practice previous year questions (PYQs), and keep your focus on the high-weightage derivations mentioned above.
FAQ Section
Q1: What are the most repeated questions in the CBSE Class 12 Physics Question Bank for Chapter 1?
A: Historically, derivations of the electric field due to an infinite line charge (using Gauss’s Law) and the torque on a dipole are the most repeated. Numerical problems usually focus on Coulomb's Law and finding the null point between two charges.
Q2: Is the derivation of the electric field inside a conductor important for 2026?
A: Yes, understanding that the electric field inside a charged conductor is zero is a recurring conceptual question in both 1-mark and case-study sections.
Q3: How should medical aspirants prioritize this chapter?
A: Students aiming for medical exams should focus on the conceptual side of Electric Charges. Understanding how charges move in fields is essential for high-scoring biology-linked physics questions in NEET.
Q4: Where can I find the official Maharashtra Board and CBSE Question Banks?
A: You can access the official resources via the SCERT and MSBSHSE portals for regional boards, or the CBSE academic website for national level papers.
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