Magnetic domain was used to explain how a substance can become a magnet. The domains were shown as magnetic fields produced by moving electric charges in the atoms. The production of a temporary magnet was discussed, as well as a permanent magnet. The action of an electric field creating a magnetic field around a wire was viewed, and seen as a series of concentric circles around the wire. Looping the wire was shown to increase the strength of the magnetic field within the loop and creating an electromagnet. Concentrating the magnetic fields into an iron bar inserted into the loops greatly increased the magnetic strength.