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Electromagnetic induction is the process of generating a potential difference (voltage) by changing the magnetic field through a conductor or moving a conductor through a magnetic field. This is the principle behind generators, transformers and many other devices. This lesson is Higher Tier only for AQA GCSE Combined Science Trilogy (8464), specification section 6.7.2.
Electromagnetic induction is the process by which a potential difference (and, if there is a complete circuit, a current) is induced in a conductor when:
In both cases, the conductor must experience a change in the magnetic field passing through it (a change in magnetic flux).
Key Point: If there is no change in the magnetic field through the conductor, no potential difference is induced. A stationary wire in a constant magnetic field produces nothing.
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