The magnetic field of a permanent magnet suspended by a spring in the TeachSpin apparatus. The total magnetic field is due both to the magnetic field of the magnet and also to the magnetic field due to a current in the top coil. The magnet is fixed so that its north pole points downward, and the current in the coil is counter-clockwise when seen from above. The resulting force on the magnet is upwards, and the magnet moves upward as the current in the coil is increased. The magnet is partially levitated by the magnetic field of the coil. This image corresponds to a real experiment done in 8.02, Introductory Electromagnetism, at MIT.