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What happened when Michael Faraday closed the battery circuit in his iron-ring experiment?
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Michael Faraday
Michael Faraday, oil on canvas by Thomas Phillips, 1841–42; in the National Portrait Gallery, London.
When Michael Faraday closed the battery circuit in his iron-ring experiment on August 29, 1831, he observed the galvanometer needle jump. This movement indicated that an electric current had been induced in the secondary coil by the current flowing through the primary coil connected to the battery.1