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This lesson covers electromagnetic induction — the generation of a voltage (and current) by a changing magnetic field — as required by the Edexcel GCSE Physics specification (1PH0), Topic 8: Magnetism and Electromagnetism. You need to understand how a voltage is induced, the factors that affect its size, and Lenz's law (Higher tier).
Electromagnetic induction is the process by which a voltage (also called an electromotive force, or e.m.f.) is induced across a conductor when it experiences a changing magnetic field.
This can happen in two ways:
In both cases, the key requirement is that there is relative motion between the conductor and the magnetic field — or more precisely, the magnetic flux through the conductor must be changing.
Exam Tip: Electromagnetic induction requires a change in the magnetic field experienced by the conductor. If the conductor is stationary in a constant magnetic field, no voltage is induced. The conductor must move, or the magnetic field must change.
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