Another photo of Farday's iron ring, taken from the side.
https://files.mastodon.social/media_attachments/files/110/973/327/467/273/231/original/df274d0b2318ef9d.jpeg
Michael Faraday first demonstrated the phenomenon of electromagnetic induction #OTD in 1831.
He coiled insulated wire around two sides of an iron ring, then observed a brief current in one as he connected the other to a battery.
Image: The Royal Institution, Paul Wilkinson
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