Physics

---
target: 495+/500
author: Senior Sibling
name: physics
description: Master framework for CBSE 12th Physics. Covers Electrostatics to Semiconductors.
stream: shared
---

# Physics — CBSE Grade 12 (2026-27)

## Syllabus Coverage
| Unit | Chapters | Theory Marks | Practical Marks |
|------|----------|--------------|-----------------|
| I | Electrostatics (Ch 1, 2) | 16 | 30 (Combined) |
| II | Current Electricity (Ch 3) | 16 | |
| III | Magnetic Effects (Ch 4, 5) | 17 | |
| IV | EMI & AC (Ch 6, 7) | 17 | |
| V | EM Waves (Ch 8) | 18 | |
| VI | Optics (Ch 9, 10) | 18 | |
| VII | Dual Nature (Ch 11) | 12 | |
| VIII| Atoms & Nuclei (Ch 12, 13) | 12 | |
| IX | Electronic Devices (Ch 14) | 7 | |

## Chapter-by-Chapter Deep Dive
- **Ch 1: Electric Charges & Fields**: Coulomb's Law, Electric Field Lines, Electric Dipole, Gauss's Law Applications.
- **Ch 9: Ray Optics**: Reflection, Refraction, Lens Maker's Formula, Microscopes, Telescopes.
- **Ch 14: Semiconductors**: p-n junction, Diode as Rectifier, Logic Gates (if in syllabus).

## High-Yield Topics (490+ Strategy)
- **Gauss's Law Applications** (Sure shot 3M/5M).
- **Lens Maker's Formula & Compound Microscope** (Optics LA).
- **LCR Series Circuit & Resonance** (AC LA).

## Derivation/Proof Bank
1. Electric field on axial/equatorial line of dipole.
2. Gauss's Law application: Infinite wire, Thin sheet, Shell.
3. Drift velocity expression $v_d = -eE\tau/m$.
4. Mirror Formula & Lens Maker's Formula.

## Formula Bank
- **Electrostatics**: $F = k q_1 q_2 / r^2$
- **Optics**: $1/f = (n-1)(1/R_1 - 1/R_2)$

## Diagram Bank
- Electric field lines (Positive/Negative/Dipole).
- Ray diagrams for Compound Microscope & Astronomical Telescope.
- V-I characteristics of p-n junction.

## CBSE Question Patterns (12th specific)
- 1M: MCQ on properties of EM waves.
- 3M: Numerical on LCR resonance.
- 5M: Derivation of Electric Field due to dipole.

## NEET/JEE Alignment
- **JEE**: Focus on complex circuit solving, Variable $\epsilon$ in capacitors.
- **NEET**: Focus on direct formula application in Optics and Modern Physics.

## Practical Component
- **Experiments**: Meter Bridge, Potentiometer, Concave Mirror/Lens, p-n junction.
- **Viva**: Why is Potentiometer preferred over Voltmeter? What is the role of a jockey?

## Common Mistakes (12th specific)
- Forgetting to label vectors in diagrams.
- Missing the $\pm$ sign in mirror/lens formulas.

## Internal Assessment Strategy (30 marks)
- Maintain a neat lab record with all 8 experiments.
- Be prepared for Viva on the "Principle" of the experiment.

## Answer Writing for 12th
- Start with a clear diagram on the right.
- List "Given" values with units first.
- Box the final result.