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Faraday's induction ring, 1831.

Faraday's induction ring, 1831.
3 3 c m
actual image size: 32cm x 25cm


This iron ring with two coils wound around it is the one used by English chemist and physicist Michael Faraday (1791-1867) in 1831, in one of his most famous experiments. Faraday discovered that although the coils were not actually connected to each other, electricity was produced in one coil every time the electric current through the other one changed. He realised that the 'induction' of electricity in the second coil could be explained only by the presence of such a magnetic effect in the iron core.

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© Royal Institution / Science & Society Picture Library

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