Electrostatic Potential and Capacitance — Class 12 CBSE Physics revision notes
A 5-page visual revision sheet for Electrostatic Potential and Capacitance, written for Class 12 CBSE Physics. Formulas, diagrams and the traps that cost marks, laid out to be read the night before rather than the term before. Free, and it opens inside CapCompass.
What this Electrostatic Potential and Capacitance sheet covers
- Potential
- Potential energy
- Potential vs field, scalar vs vector
- Potential V
- Field E
- Point charge and superposition
- Potential energy of a system
- How fast each one falls off
- Field from potential
- Equipotential surfaces
- Around a point charge
- Inside a uniform field
- A conductor is one equipotential
- Where the minus sign comes from
- Capacitance
- definition
- parallel plate, vacuum
- parallel plate, dielectric K fills the gap
- unit, farad
- Sphere and cylinder capacitors
- isolated sphere, radius R
- spherical, inner a outer b
- cylindrical, length L
- Series vs parallel
- Series
- Parallel
- Energy stored
- in terms of V
- in terms of Q
- mixed form
- energy density in the field
- Self energy of a charged sphere
- conducting shell, charge Q radius R
- uniformly charged solid sphere
- Sliding in a dielectric
- Battery still connected
- Battery disconnected
- A slab only part-way in
- dielectric slab of thickness t in the gap
- metal slab of thickness t (K → ∞)
- Two capacitors sharing charge
- joined plus to plus, common V
- energy lost as heat in the sharing
- Symbols
- Traps that cost marks
- Tricks that save time
How CapCompass uses this sheet
These notes are not a standalone PDF. CapCompass plans Physics chapter by chapter against your real exam dates and free hours, and when the plan reaches Electrostatic Potential and Capacitance the sheet opens inside the study block itself — at the page covering the sub-topic that block is on, with the timer still running. Revision arrives at the moment the plan says revise, instead of having to be gone looking for.