Question

Collect information of experiments done by Faraday.

Answer 1

Michael Faraday discovered electromagnetic induction in 1831. He hypothesized that changing magnetic field is necessary to induce current in a nearby circuit. In his experiment as shown in figure(1), he moved a magnet back and forth inside the coil. When he moves the magnet back and forth, he noticed that the galvanometer needle moves, indicating that a current is induced in the coil. Notice also that the needle immediately returns to zero when the magnet is not moving. Faraday confirmed that a moving magnetic field is necessary in order for electromagnetic induction to occur.