Magnetic Effects of Current and Magnetism

The third Class 12 unit of the JEE Main 2027 Physics syllabus and a High-priority topic (typically 5-7% of the paper). It covers the Biot-Savart and Ampere laws and the magnetic fields of wires, loops and solenoids, the Lorentz force and the motion of charges in magnetic fields, the cyclotron, the force on a current-carrying conductor and between parallel currents, the torque on a current loop and its magnetic moment, the moving-coil galvanometer, and magnetism of bar magnets and materials.