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.