Chapter 6: Electromagnetic Induction
NCERT Class 12 Physics, Part I, Chapter 6. 8 lessons, 17 narrated 3D videos, 8 simulations and 16 quiz questions, following the textbook section by section.
- Faraday’s experiments and magnetic fluxWe know that an electric current produces a magnetic field. Around 1830, Michael Faraday in England and Joseph Henry in America asked the reverse question: can a magnet…
- Faraday’s law of inductionFaraday’s experiments showed that a changing magnetic flux induces a current. But how big is the effect? Faraday found a remarkably simple answer.
- Lenz’s law and energyFaraday’s law tells us how big the induced emf is. In 1834, the German physicist Heinrich Lenz gave a rule for its direction.
- Motional emfHere is a U-shaped conductor lying in a uniform magnetic field B, pointing into the page. A straight rod of length l rests across its two arms and can slide along them.
- Mutual inductanceRemember Faraday’s two coils. A current in one coil sends magnetic flux through the other. Change that current, and an emf appears in the other coil.
- Self-inductanceA current in a coil sends magnetic flux through the coil itself. So if that current changes, the coil’s own flux changes, and an emf is induced in the same coil. This is…
- The AC generatorAlmost all the electricity we use comes from one simple idea: turn a coil in a magnetic field. The machine is the AC generator. It changes mechanical energy into…
- Eddy currentsThis topic is beyond the current NCERT syllabus, but it is useful, especially for competitive exams, and it explains many machines around you.