CBSE 12 Physics · U3
Magnetic Effects of Current and Magnetism
CBSE Class 12 Physics Unit III: magnetic field, Oersted's experiment, Biot-Savart law, Ampere's law, force on moving charges and current-carrying conductors, torque on current loops, moving-coil galvanometer, bar magnets, magnetic field lines, and magnetic materials.
Test yourself
A focused, distraction-free run through 25 multiple-choice questions. Hints if you need them; your score at the end.
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Topic 3.1
Magnetic Field Due to Currents
Oersted's experiment, Biot-Savart law, circular coils, Ampere's law, long straight conductors, and solenoids.
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Topic 3.2
Motion of Charges in Magnetic and Electric Fields
Lorentz force, circular motion in magnetic fields, crossed fields, and velocity selection.
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Topic 3.3
Force on Current-Carrying Conductors
Magnetic force on a conductor, Fleming's left-hand rule, force between parallel currents, and the ampere.
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Topic 3.4
Current Loop, Magnetic Dipole, and Galvanometer
Torque on current loops, magnetic dipole moment, moving-coil galvanometer, current sensitivity, and ammeter/voltmeter conversion.
Topic 3.5
Magnetism and Matter
Bar magnets, magnetic field lines, magnetic materials, magnetisation, and temperature effects.
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