Videos: Homopolar motors – make your own

Here, two unique wire-form hearts show some surprising twists, then unite to become one in the final embrace. There is actually four examples of homopolar motors in this video, including with the apparatus upside down! The homopolar motor works from the Lorentz principle. Current flowing through a wire makes a magnetic field, which interacts with the magnetic field of the neodymium magnet, producing torque on the wire.