Electrostatic Potential and Capacitance Class 12 Physics: Notes, Questions, MCQs & Revision 2026-27

Electrostatic Potential and Capacitance — Class 12 Physics
Complete Chapter 2 study hub for CBSE 2026–27 with notes, important questions, MCQs, numericals, case-based questions, assertion–reason practice, formula revision and a chapter test.

Electrostatic Potential and Capacitance — Complete Study Resources

Chapter 2 of Class 12 Physics builds on electrostatic fields and focuses on electric potential, potential difference, potential energy, conductors, dielectrics, capacitors and the energy stored in capacitors. This page brings the complete chapter resource set together so you can follow a simple Learn → Practise → Revise → Test sequence.

The CBSE 2026–27 Physics curriculum places Chapters 1 and 2 under Unit I: Electrostatics, which carries 16 marks at the unit level. CBSE does not assign a separate fixed mark allocation to Chapter 2 on the curriculum page. Official CBSE Physics 2026–27 curriculum

Important: The practice questions on Learn Revise Hub are original practice material unless a page is explicitly identified as a PYQ/source-based resource. They should not be treated as official CBSE questions.

Chapter 2 — Syllabus Scope

The current CBSE 2026–27 syllabus includes the following Chapter 2 areas:

• Electric potential and potential difference
• Electric potential due to a point charge, electric dipole and system of charges
• Equipotential surfaces
• Electrostatic potential energy of a system of two point charges
• Potential energy of an electric dipole in an electrostatic field
• Conductors and insulators
• Free and bound charges inside a conductor
• Dielectrics and electric polarization
• Capacitors and capacitance
• Combination of capacitors in series and parallel
• Capacitance of a parallel-plate capacitor with and without dielectric medium
• Energy stored in a capacitor — formulae only, without derivation in the listed syllabus scope

Start Here — Recommended Study Order

1. Learn
Complete Notes
Understand the chapter concepts.

2. Practise
Important Questions
Work through exam-oriented questions.

3. Check Concepts
MCQs
Test quick concept recall.

4. Solve
Numericals
Practise calculations step by step.

5. Apply
Case-Based Questions
Practise application-oriented questions.

6. Reason
Assertion–Reason
Strengthen conceptual reasoning.

7. Revise
Formula Sheet & Quick Revision
Review formulas and exam traps.

8. Test
Chapter Test
Measure your chapter preparation.

Chapter 2 Resource Library

1. Complete Notes

Build the conceptual foundation before moving to question practice.

Electrostatic Potential and Capacitance Class 12 Physics — Complete Notes

2. Important Questions

Original exam-oriented questions covering the chapter's major concepts and calculation areas.

Electrostatic Potential and Capacitance Class 12 — Important Questions

3. MCQs

Concept-focused multiple-choice practice with answers and explanations.

Electrostatic Potential and Capacitance Class 12 Physics — MCQs

4. Numericals

Step-by-step numerical practice covering potential, energy, capacitance and capacitor combinations.

Electrostatic Potential and Capacitance Class 12 Physics — Numericals

5. Case-Based Questions

Application-oriented case studies for practising interpretation and multi-step reasoning.

Electrostatic Potential and Capacitance Class 12 Physics — Case-Based Questions

6. Assertion–Reason Questions

Reasoning practice designed to test conceptual relationships rather than formula recall alone.

Electrostatic Potential and Capacitance Class 12 Physics — Assertion–Reason Questions

7. Formula Sheet & Quick Revision

A compact revision page for formulas, key relationships, exam traps and capacitor condition changes.

Electrostatic Potential and Capacitance Class 12 Physics — Formula Sheet & Quick Revision

8. Chapter Test

A 25-question self-assessment containing MCQs, numericals and conceptual/application questions.

Electrostatic Potential and Capacitance Class 12 Physics — Chapter Test

High-Priority Formulas

Topic	Formula
Potential due to point charge	V = (1/4πε0)q/r
Potential due to system of charges	V = (1/4πε0)Σ(qi/ri)
Potential of short dipole	V = (1/4πε0)(p cosθ/r2)
Potential energy of two charges	U = (1/4πε0)q1q2/r
Dipole energy in uniform field	U = −pE cosθ
Capacitance	C = Q/V
Parallel-plate capacitor	C = ε0A/d
With dielectric	C = Kε0A/d
Series capacitors	1/Ceq = Σ(1/Ci)
Parallel capacitors	Ceq = ΣCi
Capacitor energy	U = ½CV2 = ½QV = Q2/(2C)

Most Important Concept Checks

• Electric potential is a scalar quantity.
• Potential is added algebraically for a system of point charges.
• V = 0 does not necessarily mean E = 0.
• Electric field is perpendicular to an equipotential surface.
• Work done along an equipotential surface is zero.
• In electrostatic equilibrium, the electric field inside the conducting material is zero.
• For capacitors in series, the charge magnitude is the same in the simple series combination.
• For capacitors in parallel, the potential difference is the same.
• A connected ideal battery keeps the capacitor voltage fixed.
• An isolated capacitor keeps its charge fixed when a dielectric is inserted.

Common Exam Traps

• Confusing electric potential with electric field.
• Adding scalar potentials as vectors.
• Using the wrong series/parallel rule.
• Forgetting whether a battery remains connected.
• Dropping the sign of charge in potential-energy calculations.
• Using the far-field dipole potential formula outside its stated approximation.
• Using a capacitor energy expression without checking which quantities are known or fixed.

Chapter 1 Connection

Chapter 2 follows naturally from Chapter 1 because electric potential provides another way of describing electrostatic effects. If you want to revise the preceding chapter first, use the Chapter 1 hub: Electric Charges and Fields — Class 12 Physics Chapter 1 Hub.

After Completing This Chapter

Before moving ahead, make sure you can:

• Explain the difference between electric potential and electric field.
• Calculate potential due to point charges and a system of charges.
• Use dipole potential and potential-energy relations correctly.
• Explain equipotential surfaces and their relation to electric field.
• Apply conductor and dielectric concepts.
• Calculate equivalent capacitance in series and parallel.
• Calculate capacitor charge, potential difference and stored energy.
• Handle connected-battery and isolated-capacitor dielectric problems.
• Complete the Chapter 2 test without relying on the answer key.

Official CBSE Resources

CBSE Physics Curriculum 2026–27

CBSE Class XII 2026–27 Sample Question Papers & Marking Schemes

Study principle: Learn the concept first, practise different question types next, revise the formulas, and then take the chapter test under timed conditions.