Top 20 Important Physics Topics for NEET 2025

Equations of motion: v = u + at

s = ut + \frac{1}{2}at^2

v^2 = u^2 + 2as

Work-Energy Theorem: W_{net} = \Delta K.E.

Torque: \tau = I\alpha

Angular Momentum: L = I\omega

Parallel Axis Theorem: I = I_{cm} + Md^2

First Law of Thermodynamics: \Delta U = Q - W

Efficiency of a Carnot Engine: \eta = 1 - \frac{T_2}{T_1}

Kirchhoff's Voltage Law (KVL): \sum \Delta V = 0

Kirchhoff's Current Law (KCL): \sum I_{in} = \sum I_{out}

Magnetic field due to a long straight wire: B = \frac{\mu_0 I}{2\pi r}

Force on a moving charge: \vec{F} = q(\vec{v} \times \vec{B})

Lens Maker's Formula: \frac{1}{f} = (\frac{\mu_2}{\mu_1} - 1)(\frac{1}{R_1} - \frac{1}{R_2})

Mirror Formula: \frac{1}{f} = \frac{1}{v} + \frac{1}{u}

Fringe width in YDSE: \beta = \frac{\lambda D}{d}

Condition for minima in single-slit diffraction: a \sin\theta = n\lambda

Einstein's Photoelectric Equation: K.E._{max} = h\nu - \phi_0

de Broglie Wavelength: \lambda = \frac{h}{p} = \frac{h}{mv}

No specific complex formulas, but a deep understanding of concepts and circuit diagrams is required.

Capacitance of a parallel plate capacitor: C = \frac{\epsilon_0 A}{d}

Energy stored in a capacitor: U = \frac{1}{2}CV^2

Induced EMF: \mathcal{E} = -N\frac{d\Phi_B}{dt}

Impedance of an LCR circuit: Z = \sqrt{R^2 + (X_L - X_C)^2}

Universal Law of Gravitation: F = G\frac{m_1 m_2}{r^2}

Escape Velocity: v_e = \sqrt{\frac{2GM}{R}} .

Bernoulli's Equation: P + \frac{1}{2}\rho v^2 + \rho gh = \text{constant}

Stoke's Law: F = 6\pi\eta rv

Equation of SHM: y = A\sin(\omega t + \phi)

Doppler Effect (for sound, source moving towards stationary observer): f' = f(\frac{v}{v - v_s})

Coulomb's Law: F = \frac{1}{4\pi\epsilon_0}\frac{q_1 q_2}{r^2}

Gauss's Law: \oint \vec{E} \cdot d\vec{A} = \frac{Q_{enclosed}}{\epsilon_0}

Pressure of an Ideal Gas: P = \frac{1}{3}\frac{M}{V}v_{rms}^2

Average Kinetic Energy: K.E._{avg} = \frac{3}{2}k_B T

Speed of light in vacuum: c = \frac{1}{\sqrt{\mu_0 \epsilon_0}} .

Relationship between electric and magnetic fields: E_0 = cB_0

Understanding of dimensional formulas is key. For example, Force = [MLT^{-2}]

Coefficient of restitution: e = \frac{\text{velocity of separation}}{\text{velocity of approach}} .

Energy of a photon: E = h\nu = \frac{hc}{\lambda}