JEE Main 2026 Physics: Chapter-Wise Important Formulas & Equations

JEE Main 2026 Physics: Chapter-Wise Important Formulas & Equations

 

JEE Main Physics Formulas 2026 include the most frequently asked equations required to solve both numerical and conceptual questions in the exam. Regular revision of these formulas improves speed, accuracy, and confidence, making them essential for every JEE aspirant.

This AcadXL guide works as concise JEE Main Physics revision notes, covering all major units such as Mechanics, Electrodynamics, Thermodynamics, Optics, Waves, and Modern Physics.

Important JEE Main Physics Formulas 2026 (Chapter-Wise)

Below are the most important Physics formulas for JEE Main, arranged chapter-wise for easy understanding and quick recall during revision.

🔹 Mechanics Formulas

Mechanics forms the foundation of Physics and includes motion, force, energy, rotation, and gravitation.

Kinematics

• Velocity:
  v = u + at
  
  

• Displacement:
  s = ut + ½at²
  
  

• Velocity–Displacement Relation:
  v² = u² + 2as
  
  

Projectile Motion

• Time of Flight:
  T = (2u sinθ) / g
  
  

• Maximum Height:
  H = (u² sin²θ) / (2g)
  
  

• Range:
  R = (u² sin2θ) / g
  

Newton’s Laws of Motion

• Force:
  F = ma
  
  

• Frictional Force:
  F = μN
  
  

Work, Energy & Power

• Work Done:
  W = Fd cosθ
  
  

• Kinetic Energy:
  KE = ½mv²
  
  

• Gravitational Potential Energy:
  PE = mgh

Rotational Dynamics

• Torque:
  τ = Iα
  
  

• Angular Momentum:
  L = Iω
  
  

Gravitation

• Escape Velocity:
  ve = √(2GM / R)
  
  

• Orbital Velocity:
  vo = √(GM / r)
  
  

• Gravitational Potential:
  V = −GM / r

🔹 Electrodynamics & Magnetism Formulas

This section includes electric charges, current electricity, and magnetic effects.

Electrostatics & Capacitance

• Coulomb’s Law:
  F = k(q₁q₂ / r²)
  
  

• Electric Field:
  E = F / Q
  
  

• Electric Potential:
  V = kq / r
  
  

• Capacitance (Parallel Plate):
  C = ε₀A / d
  
  

• Energy Stored in Capacitor:
  U = ½CV²
  
  

Current Electricity

• Ohm’s Law:
  V = IR
  
  

• Current:
  I = Q / t
  
  

• Kirchhoff’s Voltage Law:
  ΣΔV = 0
  

Magnetic Effects of Current

• Biot–Savart Law:
  dB = (μ₀ / 4π) × (I dl sinθ / r²)
  
  

• Magnetic Force on Moving Charge:
  F = q(v × B)

 

🔹 Heat & Thermodynamics Formulas

Thermodynamics is a high-scoring section in JEE Main Physics.

Thermodynamics

• First Law:
  ΔU = Q − W
  
  

• Work Done (Isothermal Process):
  W = nRT ln(V₂ / V₁)
  
  

• Carnot Engine Efficiency:
  η = 1 − (T₂ / T₁)
  
  

Kinetic Theory of Gases

• Ideal Gas Equation:
  PV = nRT
  
  

• RMS Speed:
  vrms = √(3RT / M)

 

🔹 Optics & Waves Formulas

Ray & Wave Optics

• Lens Maker’s Formula:
  1/f = (μ − 1)(1/R₁ − 1/R₂)
  
  

• Mirror Formula:
  1/f = 1/v + 1/u
  
  

• Young’s Double Slit Fringe Width:
  β = λD / d
  
  

Oscillations & Waves

• SHM Displacement:
  x = A sin(ωt + φ)
  
  

• Time Period of Simple Pendulum:
  T = 2π√(L / g)
  
  

• Doppler Effect:
  f′ = f[(v ± vo)/(v ∓ vs)]
  
  

🔹 Modern Physics & Semiconductors Formulas

Modern Physics carries high weightage and is conceptually direct.

Atoms, Nuclei & Dual Nature

• Photoelectric Equation:
  Kmax = hf − φ
  
  

• De Broglie Wavelength:
  λ = h / p
  
  

• Radioactive Decay Law:
  N = N₀e⁻ˡᵗ
  
  

Semiconductors

• Mass Action Law:
  ni² = ne nh
  
  

• Transistor Current Gain:
  β = IC / IB

 

How to Use JEE Main Physics Formula Sheet Effectively? (AcadXL Tips)

To make the best use of this JEE Main Physics Formula Sheet 2026, follow these proven strategies:

• Revise Daily:
  Spend 15–20 minutes every day revising formulas to improve recall speed.
  
  

• Understand the Meaning:
  Don’t just memorize—understand the physical significance of each formula.
  
  

• Link Formulas with Concepts:
  Know when and where a formula is applicable.
  
  

• Practice PYQs:
  Solve previous year questions using the formula sheet to build exam confidence.
  
  

• Use Dimensional Analysis:
  Helps in verifying formulas and eliminating wrong options in MCQs.
  
  

• Maintain Unit Consistency:
  Always convert values into SI units before applying formulas.
  
  

• Focus on High-Weightage Chapters:
  Revise Modern Physics, Current Electricity, and Electromagnetism more frequently.
  
  

• Use Before & After Mock Tests:
  Revise formulas before mocks and note forgotten ones after mocks.

AcadXL Final Words

✔ Physics becomes scoring when formulas are clear and well-practiced
✔ Regular revision beats last-minute cramming
✔ Smart formula usage = higher accuracy & better percentile

📌 Master these formulas, practice regularly, and Physics will become your strength in JEE Main 2026.

 

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