Faraday Discovers Electromagnetic Induction

Michael Faraday wrapped two insulated copper coils around opposite sides of a six-inch iron ring at the Royal Institution in London. When he connected one coil to a battery, a galvanometer on the second coil briefly deflected, revealing that a changing magnetic field produces electric current. Over the following months, Faraday demonstrated the same principle with bar magnets and spinning copper disks, establishing the physical basis for electric generators and transformers.