Electromagnetic Induction
Telangana Open School (TOSS) · Class 12 · Physics
Complete topic list for Electromagnetic Induction in Telangana Open School (TOSS) Class 12 Physics. Key concepts, sub-topics, and what to focus on for board exams.
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Topics in Electromagnetic Induction
1. Electromagnetic Induction and Faraday's Law
- An emf is induced in a coil when the magnetic flux through it changes with time.
- The magnitude of induced emf is directly proportional to the rate of change of magnetic flux.
- This phenomenon was discovered by Michael Faraday through experiments involving coils and magnets.
2. Lenz's Law and Direction of Induced EMF
- Lenz's law gives the direction of the induced emf and current.
- The induced current flows in such a direction that it opposes the change causing it.
- This opposition is a result of energy conservation — work must be done to induce current.
3. Motional Electromotive Force
- When a conductor moves in a magnetic field, emf is induced across its ends.
- This is called motional emf and occurs even without a coil.
- Motional emf arises due to Lorentz force on free electrons in the conductor.
4. Eddy Currents and Their Applications
- Eddy currents are loops of induced current formed in bulk metal when exposed to changing magnetic fields.
- They flow in closed paths perpendicular to the magnetic field.
- Direction follows Lenz’s law — they oppose the change causing them.
Key Concepts
Central concept: Electromagnetic Induction
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