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Electromagnetic Induction

Chapter summary, hard words and model exam answers for ICSE Class 10 Hindi.

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Physics · CBSE 10 · ICSE 10 · GCSE (AQA, Edexcel, OCR)

Faraday (1831) moved a magnet into a coil and the meter flicked. Moving it out flicked the other way; holding it still gave nothing.

Push a north pole in and the coil makes a north pole to repel it. That opposition is why you must do work, which becomes electrical energy.

As the coil turns, the flux through it rises and falls, inducing an alternating EMF. Slip rings give AC; a split-ring commutator gives DC.

The grid steps voltage up to cut current, so far less energy is lost as heat (P = I squared R) over long cables, then steps it down for homes.

electromagnetic induction	producing an EMF by a changing magnetic flux through a coil
magnetic flux	the amount of magnetic field passing through an area
EMF	the voltage induced that can drive a current, in volts
Faraday's law	induced EMF equals the number of turns times the rate of change of flux
Lenz's law	the induced current flows so as to oppose the change causing it
generator	a machine that spins a coil in a magnetic field to induce a current
transformer	two coils on an iron core that change AC voltage by mutual induction
slip rings	rotating contacts that take alternating current off a spinning coil

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