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This lesson covers Higher Tier content. Questions based on electromagnetic induction may appear only on Higher Tier papers in the Edexcel GCSE Combined Science specification (1SC0).
This lesson explains how a changing magnetic field can induce a voltage (and current) in a conductor, the factors that affect the size of the induced voltage and a qualitative understanding of Lenz's law.
Electromagnetic induction is the process of generating a voltage (and, if the circuit is complete, a current) in a conductor by changing the magnetic field around it.
There are two ways to induce a voltage:
| Method | Example |
|---|---|
| Move a conductor through a magnetic field | Pushing a wire between the poles of a magnet |
| Change the magnetic field around a stationary conductor | Moving a magnet into or out of a coil of wire |
In both cases, the conductor must cut through magnetic field lines (or the number of field lines passing through the coil must change).
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