Magnets create a magnetic field that attracts certain metals like iron, nickel, and cobalt, and repels other magnets. An example is an iron nail being pulled toward a horseshoe magnet when entering its magnetic field due to the nail's ability to be magnetized by metals.

1. Magnets Magnets cause a magnetic field that attracts a number of metals, and repels other magnets. Iron, nickel and cobalt are examples of metals which can be magnetised. For example, when an iron nail enters the magnetic field of a horse-shoe magnet, it is pulled toward the magnet.