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Tamil Nadu Board Class 12 Physics — Formula Sheet

Tamil Nadu Board Class 12 Physics formula sheet, chapter by chapter — 23 formulas across 7 chapters. Follows the TN DGE syllabus.

How to Use the Formula Sheet

  1. Write, don't just read — writing each formula out helps it stick.
  2. Understand the derivation — you can rebuild a formula you half-remember.
  3. Group related formulas — link the ones that build on each other.
  4. Test yourself — cover the sheet and write the formulas from memory.

Chapter-Wise Formulas — 7 Chapters

1

Electrostatics

2 entries
Dipole moment p = q × 2a, directed from negative to positive charge
Electric field E at point P due to charge q is defined as force per unit positive test charge: E = F/q₀ = (1/4πε₀) × (q/r²).
The full Electrostatics formula sheet
2

Ray Optics

3 entries
Speed of light in vacuum: c = 3 × 10⁸ m/s (constant)
Laws of Refraction (Snell's Law): (i) Incident, refracted rays and normal are coplanar; (ii) n₁sin(i) = n₂sin(r)
The mirror equation (1/v + 1/u = 1/f) relates object distance (u), image distance (v), and focal length (f).
The full Ray Optics formula sheet
3

Current Electricity

6 entries
Current I = dQ/dt, measured in Amperes (A); 1 A = 1 C/s
Ohm's law (microscopic form): J = σE, where σ is conductivity and E is electric field
Resistance R = V/I with SI unit Ohm (Ω); 1 Ω = 1 V/A
Equivalent resistance in series: R_s = R₁ + R₂ + R₃ + ...
Terminal voltage: V = ε - Ir, where ε is emf, I is current, r is internal resistance
The full Current Electricity formula sheet

4 more chapters below

Formula sheets for all 7 chapters with formulas.

Get the Formula Sheets

Get chapter-wise help for Tamil Nadu Board Class 12 Physics

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Frequently Asked Questions

Where can I find Tamil Nadu Board Class 12 Physics Formula Sheet?

This page has formula sheet for 7 chapters of Tamil Nadu Board Class 12 Physics for the board exams 2027. Each chapter links to its own page with the full set.

Go through the syllabus first, then work chapter by chapter: learn the ideas, practise questions, and revise with notes and flashcards. Leave time at the end to revise every chapter once more under timed conditions.

Learn the formulas you use most first, and understand what each symbol means so you can apply them. Knowing where a formula comes from helps you rebuild it if you forget it in the exam.

Browse Formula Sheet by Chapter

7 chapters

1

Electrostatics

2

Ray Optics

3

Current Electricity

4

Wave Optics

5

Magnetism and magnetic effects of electric current

6

Dual Nature of Radiation and Matter

7

Electromagnetic Induction And Alternating Current

More Physics Resources

Tamil Nadu Board Class 12

Practice Quiz

Test yourself with quick quizzes

Important Questions

Exam-style questions with answers

Revision Notes

Key concepts and quick revision points

Chapter Summary

Understand each chapter at a glance

Concept Maps

Diagrams showing how topics connect

Flashcards

Quick-fire cards for active recall practice

Syllabus

Chapter list and the topics in each

Other Tamil Nadu Board Class 12 Subjects

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