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Electromagnetic Induction
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Electromagnetic Induction
If the magnetic field through a coil changes, a voltage can be produced in the coil.
Scientists connected to this topic
Known for: Electromagnetic induction; the farad is named after him.
Wikimedia Commons — Thomas Phillips, 1842 (public domain).
Recommended for Class 10
Electromagnetic Induction
Electromagnetic induction is the production of an e.m.f. when the magnetic flux linked with a conductor or coil changes.
A changing magnetic field is therefore able to produce an electrical effect.
Ways to Produce Induction
Induced e.m.f. can be produced by:
moving a magnet toward or away from a coil; moving the coil through a magnetic field; * changing the current in a nearby coil.
Magnetic Flux
Magnetic flux can be written as:
**Φ = BA cosθ**
For a coil of `N` turns, flux linkage is:
NΦ
Changing this flux linkage produces an induced e.m.f.
Increasing Induced E.m.f.
The induced e.m.f. becomes larger when:
magnetic field changes more quickly; magnet moves faster; coil has more turns; field is stronger.
Scientists connected to this topic
Known for: Electromagnetic induction; the farad is named after him.
Wikimedia Commons — Thomas Phillips, 1842 (public domain).
Electromagnetic Induction — Advanced
Electromagnetic induction is governed by time-varying magnetic flux linkage. The induced e.m.f. depends on the rate of change of flux, not on flux magnitude alone.
Scientists connected to this topic
Known for: Electromagnetic induction; the farad is named after him.
Wikimedia Commons — Thomas Phillips, 1842 (public domain).
Common Mistakes
Common Mistakes
- Mistake
A stationary magnet and stationary coil with constant magnetic field do not continuously produce induced e.m.f.
- Mistake
It is change in flux, not simply presence of a magnet, that matters.
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Practice
PQ
Q1. Define induction
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Q2. give two methods
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Q3. explain why stationary magnet gives no continuous emf
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Q4. state effect of speed
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Q5. state effect of turns.
Exam Practice
EQ
Q1. Define electromagnetic induction.
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Q2. Explain magnet-coil experiment.
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Q3. State factors affecting induced emf.
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Q4. Define magnetic flux.
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Q5. Explain why relative motion matters.
School-standard facts for Matric and Intermediate. Original explanations — not copied from textbooks.