Bihar Board Class 12 Physics Weightage 2026 Unit and Chapter-Wise Mark Distribution

1

Electrostatics - Electric Charges, Conservation of charge, Coulomb’s law-force between two point charges, forces between multiple charges, the electrical potential energy of a system of two point charges and of an electric dipole in an electrostatic field, etc.

08

2

Current Electricity - Ohm’s law, electrical resistance, V-I characteristics (linear and nonlinear), electrical energy and power, electrical resistivity and conductivity, Kirchhoff’s laws, and simple applications. Wheatstone bridge, metre bridge, etc.

07

3

Magnetic Effect of Current and Magnetism - Torque on a magnetic dipole (bar magnet) in a uniform magnetic field; bar magnet as an equivalent solenoid, Force on a moving charge in a uniform magnetic and electric fields, Earth’s magnetic field and magnetic elements, etc.

08

5

Electromagnetic Waves - Electromagnetic waves, their characteristics, their transverse nature, the Electromagnetic spectrum, including elementary facts about their uses, etc.

03

6

Optics - Refraction of light, total internal reflection and its applications, lensmaker’s formula. Magnification, power of a lens, Reflection of light, spherical mirrors, mirror formula, a combination of thin lenses in contact, etc.

14

7

Dual Nature of Matter and Radiation - Matter waves-wave nature of particles, de Broglie relation, Photoelectric effect, Hertz and Lenard’s observations; Einstein’s photoelectric equation-particle nature of light, Davisson-Germer experiment, etc.

04

8

Atom and Nuclei - Bohr model, energy levels, hydrogen spectrum, Composition and size of nucleus, Alpha-particle scattering experiment; Rutherford’s model of atom; atomic masses, isotopes, radioactive decay law, etc.

06

9

Electronic Devices - Transistor as a switch, I-V characteristics of the transistor, transistor as an amplifier (common emitter configuration), the basic idea of analogue and digital signals, etc.

01

Total

70