Electromagnetism
Faraday continued studying this connection, running tests with loops of wire and magnets. He found that if he set up two loops of wire and ran electricity through just one of them, he could (for a little while) produce an electric current in the other loop as well. Faraday also discovered that he could produce a current by moving a magnet through a loop of wire, or by moving the wire over a magnet. What Faraday had shown was that magnets could push back on moving electric charges, and that moving magnets could push on charges sitting still. This was like what Ørsted had found, but in reverse.