JEE Main Electrodynamics: Current Electricity, Magnetism & EMI Guide
Electrodynamics is the highest-weightage Physics chapter in JEE Main, contributing 4-5 questions consistently. Here is a complete breakdown of what to focus on and how to approach this chapter.
Current Electricity (2 questions)
Key topics: Ohm's Law, Kirchhoff's Laws, Wheatstone Bridge, Meter Bridge, Potentiometer. The two circuits every year: balanced/unbalanced bridge, and potentiometer null-point calculation. Practice multi-loop circuits with Kirchhoff — they are algorithmic once mastered.
Magnetism (2 questions)
Magnetic field due to current-carrying wires (straight, circular, solenoid), Biot-Savart Law, Ampere's Law. Motion of charges in magnetic fields — velocity selector, cyclotron. Force between parallel wires and magnetic dipole in fields.
Electromagnetic Induction (1-2 questions)
Faraday's and Lenz's Laws are conceptual staples. Motional EMF (rod moving in field), mutual induction, self-inductance of solenoid. JEE Main likes: rod sliding on rails — find current/force/power.
AC Circuits (1 question)
RLC series circuits, resonance condition, power factor, impedance. Most questions are about resonance frequency, impedance at a given frequency, or phase difference. Master phasor diagrams.
EMF Sources and Internal Resistance
Battery with internal resistance is tested almost every year. Practice: cells in series, parallel, and mixed circuits. Find terminal voltage under load — a common JEE Main 1-mark question.
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