Physics Class 12th

Last Updated : 9 Mar, 2026

Class 12 Physics explores advanced concepts that explain electricity, magnetism, light, and modern physics. It builds on the fundamentals learned in earlier classes and introduces important theories that form the basis of many modern technologies.

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Electric Charges and Fields

Covers the fundamental nature of electric charge and its conservation and quantization, interaction between charges through Coulomb’s inverse square law, the concept of electric field and electric flux, field lines, electric dipoles, continuous charge distributions, and systematic application of Gauss’s law to calculate electric fields for symmetric configurations.

Electrostatic Potential and Capacitance

Explains electric potential as work done per unit charge, the relation between electric field and potential, the potential energy of charge systems, the properties of conductors in electrostatic equilibrium, the behavior of dielectrics, the capacitance of parallel plate capacitors, combinations of capacitors, and a detailed analysis of energy stored in electric fields.

Current Electricity

Describes electric current as the flow of charges, the microscopic origin of drift velocity and resistivity, the limitations of Ohm’s law, the temperature dependence of resistance, electrical energy and power, series and parallel resistor combinations, cells with internal resistance, and detailed circuit analysis using Kirchhoff’s laws, Wheatstone bridge, meter bridge, and potentiometer.

Moving Charges and Magnetism

Examines magnetic effects produced by moving charges and current-carrying conductors, Lorentz force, motion in uniform magnetic fields, Biot–Savart law, Ampere’s circuital law, magnetic field due to loops and solenoids, force between parallel currents, torque on current loops, and the working principle of the moving coil galvanometer.

Magnetism and Matter

Discusses magnetic field lines and properties of bar magnets, Gauss’s law of magnetism, Earth’s magnetic elements, magnetization and magnetic intensity, classification of materials into diamagnetic, paramagnetic, and ferromagnetic substances, and a comparative study of permanent magnets and electromagnets with their practical applications.

Electromagnetic Induction

Explains experimental observations of Faraday and Henry, the concept of magnetic flux, Faraday’s laws of induction, Lenz’s law and conservation of energy, motional emf, eddy currents and their applications, self and mutual inductance, energy stored in inductors, and the operating principle of an AC generator.

Alternating Current

Focuses on alternating voltage and current in resistive, inductive, and capacitive circuits; phasor representation; impedance and phase difference; behavior of series LCR circuits; resonance condition; power factor and average power; LC oscillations; and detailed construction and efficiency of transformers.

Electromagnetic Waves

Introduces displacement current as a modification of Ampere’s law, generation and propagation of electromagnetic waves, transverse nature and speed of EM waves in a vacuum, and a comprehensive study of the electromagnetic spectrum, including radio waves, microwaves, infrared, visible, ultraviolet, X-rays, and gamma rays.

Ray Optics and Optical Instruments

Deals with reflection from spherical mirrors, refraction at plane and spherical surfaces, total internal reflection and its applications, lens formula and magnification, refraction and dispersion through prisms, optical phenomena in nature, and working principles and magnifying power of microscopes and telescopes.

Wave Optics

Develops the wave theory of light using Huygens’ principle, reflection and refraction of plane waves, interference of light with Young’s double-slit experiment, conditions for constructive and destructive interference, diffraction due to a single slit, and polarization as experimental proof of the transverse wave nature.

Dual Nature of Radiation and Matter

Explains electron emission processes, detailed experimental study of the photoelectric effect, failure of classical wave theory, Einstein’s photoelectric equation and photon concept, wave–particle duality, de Broglie hypothesis of matter waves, and experimental confirmation through the Davisson–Germer electron diffraction experiment.

Atoms

Describes Rutherford’s alpha-particle scattering experiment and nuclear model, atomic spectra and spectral series, limitations of classical mechanics, Bohr’s quantized energy levels for the hydrogen atom, explanation of line spectra, and de Broglie’s interpretation of quantization through standing matter waves.

Nuclei

Covers composition and size of nucleus, atomic masses, mass–energy equivalence, binding energy and stability of nuclei, nuclear forces and their characteristics, radioactive decay laws, alpha, beta, and gamma emissions, and principles of nuclear fission and fusion as sources of nuclear energy.

Semiconductor Electronics

Introduces the energy band theory of solids, classification into conductors, insulators, and semiconductors, intrinsic and extrinsic semiconductors, formation and characteristics of p-n junction diodes, Zener diode operation, the rectification process, and implementation of basic digital logic gates in simple electronic circuits.

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