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Electrostatic Potential and Capacitance — Syllabus

Punjab Board · Class 12 · Physics

What Electrostatic Potential and Capacitance covers in Punjab Board Class 12 Physics: 4 topics, for the 2026-27 session.

45 questions23 flashcards9 formulas & key relations5 concepts

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A labeled diagram demonstrating the superposition principle, showing a central test charge and multiple surrounding source charges. Individual force vectors from each source charge on the test charge
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4 Topics · Punjab Board Class 12 Physics · 2026-27

Topics in Electrostatic Potential and Capacitance

1

1. Electrostatic Potential Energy and Electrostatic Potential

  • The Coulomb force is conservative — work done is path-independent and depends only on initial and final positions.
  • Potential Energy Difference: ΔU = U_P − U_R = W_RP (work done by external force in moving charge q from R to P).
  • The reference point for potential energy is taken at infinity where potential energy = 0.
2

2. Potential Due to Point Charge, Dipole, and System of Charges

  • Potential due to a point charge Q at distance r: V = kQ/r = Q/(4πε₀r). This falls as 1/r.
  • Potential due to a dipole falls as 1/r² — faster than for a single charge (which falls as 1/r).
  • Dipole potential depends on BOTH r (distance) AND θ (angle with dipole axis).
3

3. Equipotential Surfaces

  • An equipotential surface is a surface on which the electric potential has the same value at every point.
  • No work is done in moving a charge along an equipotential surface (since ΔV = 0, W = qΔV = 0).
  • Electric field lines are ALWAYS perpendicular (normal) to equipotential surfaces — this is a fundamental property.
4

4. Potential Energy of a System of Charges and Dipole in External Field

  • Potential energy of a system = work done by external agent in assembling the charges from infinity to their current positions.
  • For two charges: U = kq₁q₂/r₁₂. Positive U means repulsive (like charges); Negative U means attractive (unlike charges).
  • For three charges: U = k[q₁q₂/r₁₂ + q₁q₃/r₁₃ + q₂q₃/r₂₃]. Sum over all PAIRS.

Key Concepts

This is the work done byThe electrostatic potential at a pointFor a point charge Q atAn electric dipole consists of chargesThe total potential at a point

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Frequently Asked Questions

What are the important topics in Electrostatic Potential and Capacitance for Punjab Board Class 12 Physics?
Key topics in Electrostatic Potential and Capacitance include Electrostatic Potential Energy and Electrostatic Potential, Potential Due to Point Charge, Dipole, and System of Charges, Equipotential Surfaces, Potential Energy of a System of Charges and Dipole in External Field. Study these first, then practise questions on each for the Punjab Board Class 12 board exam.
How should I revise Electrostatic Potential and Capacitance for the Punjab Board Class 12 board exam?
Learn the core ideas first, then work through the 45 practice questions on Electrostatic Potential and Capacitance. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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All Punjab Board Class 12 Physics Syllabus

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