Electromagnetic Induction
Karnataka Board · Class 12 · Physics
Flashcards for Electromagnetic Induction — Karnataka Board Class 12 Physics. Quick Q&A cards covering key concepts, definitions, and formulas.
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Explore the full setWhat is electromagnetic induction?
Answer
Electromagnetic induction is the phenomenon in which an electric current is generated (induced) in a conductor when it is subjected to a changing magnetic field. This was discovered by Michael Faraday…
What is magnetic flux? Write its formula and unit.
Answer
Magnetic flux is the measure of magnetic field lines passing through a surface. Formula: Φ_B = B·A = BA cos θ, where B is magnetic field, A is area, and θ is angle between B and A. SI unit: Weber (Wb)…
State Faraday's Law of Electromagnetic Induction.
Answer
Faraday's Law states: The magnitude of induced emf in a circuit is equal to the time rate of change of magnetic flux through the circuit. Mathematically: ε = -dΦ_B/dt. For N turns: ε = -N(dΦ_B/dt). Th…
What is Lenz's Law? How does it relate to conservation of energy?
Answer
Lenz's Law: The polarity of induced emf is such that it tends to produce a current which opposes the change in magnetic flux that produced it. This ensures energy conservation - if induced current aid…
When a north pole of a magnet approaches a coil, what is the direction of induced current?
Answer
When north pole approaches, flux through coil increases. By Lenz's law, induced current flows in a direction to oppose this increase. The current creates a magnetic field with north pole facing the ap…
What is motional emf? Derive its expression.
Answer
Motional emf is induced when a conductor moves in a magnetic field. For rod PQ of length l moving with velocity v perpendicular to magnetic field B: ε = Blv. Derivation: Flux Φ = Blx, as x changes: ε …
Explain motional emf using Lorentz force approach.
Answer
When rod moves with velocity v in magnetic field B, charges experience Lorentz force F = qvB toward one end. Work done moving charge q through length l is W = qvBl. Since emf = work per unit charge: ε…
What is inductance? Define its SI unit.
Answer
Inductance is the property of a circuit that opposes changes in current. It's the ratio of flux linkage to current: L = NΦ_B/I. SI unit: Henry (H), named after Joseph Henry. Dimensions: [ML²T⁻²A⁻²]. I…
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Sources & Official References
- Karnataka SSLC — kseeb.kar.nic.in
- Dept of Pre-University Education, Karnataka
- National Education Policy 2020 — education.gov.in
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