Electrostatic Potential and Capacitance — Complete Handwritten Notes for NEET & JEE
Master the concepts of electric potential, equipotential surfaces, capacitors and dielectrics with topper-quality handwritten notes covering all derivations, circuit problems, and solved PYQs — with 40+ solved numericals.
📁 Study Material — Electric Potential & Capacitance Handwritten Notes
Topics Covered
- Electric potential — potential due to a point charge, system of charges
- Potential due to an electric dipole (axial and equatorial points)
- Equipotential surfaces — properties and their significance
- Relation between electric field and potential (E = -dV/dr)
- Potential energy of a system of charges (for two and three point charges)
- Potential energy of a dipole in an external electric field
- Capacitors — capacitance, parallel plate capacitor, spherical capacitor
- Dielectrics and polarization — dielectric constant, polar/non-polar dielectrics
- Series and parallel combination of capacitors
- Energy stored in a capacitor (U = ½CV²)
- Effect of dielectric on capacitance — insertion of dielectric slab
- Van de Graaff generator — principle and working
- Previous year questions with detailed solutions
Electrostatic Potential and Capacitance contributes 3-4 questions in NEET and 2-3 in JEE Main. Capacitor combination problems (series-parallel), energy stored in capacitors, and the effect of dielectrics are the most frequently asked topics. Practice at least 20 numericals from capacitor circuits!
📥 Download Electric Potential & Capacitance Handwritten Notes PDF
Complete Class 12 Physics Chapter 2 notes with all derivations, capacitor circuit diagrams, dielectric concepts, and solved PYQs — free download.
⬇️ Download Full PDF NowKey Formulas — Must Memorise
| Formula | Description |
|---|---|
| V = kq/r | Potential due to point charge |
| V = kp cosθ/r² | Potential due to dipole |
| E = -dV/dr | Relation between E and V |
| U = kq₁q₂/r | Potential energy of two charges |
| U = -pE cosθ | Potential energy of dipole in field |
| C = Q/V | Capacitance definition |
| C₀ = ε₀A/d | Parallel plate capacitor (air/vacuum) |
| C = KC₀ | With dielectric (K = εᵣ) |
| U = ½CV² = ½QV = Q²/2C | Energy stored in capacitor |
| Cs = 1/C₁ + 1/C₂ + 1/C₃ | Series combination (reciprocal) |
| Cp = C₁ + C₂ + C₃ | Parallel combination |
Related Notes
Frequently Asked Questions
3-4 questions in NEET and 2-3 in JEE Main. Capacitor combination problems and energy storage calculations are the most common question types.
Inserting a dielectric increases the capacitance by a factor of K (dielectric constant). For a parallel plate capacitor with dielectric, C = Kε₀A/d. The electric field inside the dielectric reduces, and energy storage capacity increases.
An equipotential surface is a surface where the electric potential is the same at every point. Properties: (1) No work is done in moving a charge on an equipotential surface. (2) Electric field lines are perpendicular to equipotential surfaces. (3) Equipotential surfaces never intersect.