8.7 Electromagnets
Electromagnets are also a kind of temporary magnets. An iron nail or a rod behaves like a magnet when an electric current passes through a coil of wire wound around it. It is called an electromagnet.
When an electric current passes through the coil of wire, a magnetic field is produced inside the coil that magnetizes the iron nail. The magnetic properties of an electromagnet are temporary. Therefore, the iron object remains a magnet as long as the electric current passes through the coil. When the current is stopped, it no longer remains a magnet.
If we increase the number of cells in the battery or increase the number of turns of the coil, the strength of the magnetic field in each case increases. This will be indicated by the greater number of clips held by the nail in these cases.