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A bar magnet is a rectangular object that has a magnetic field. It is usually made of iron or steel, but it can also be made of any ferromagnetic substance or a ferromagnetic composite. This type of magnet is almost always permanent, meaning that it will retain its magnetic field for a significant period of time without the use of a supplied electric current.

Each end of a bar magnet is called a pole — one is north and the other south. When freely suspended, the magnet will align itself so that the end of its northern pole points towards the Earth’s magnetic North Pole. This works in the exact same manner as a compass needle, which itself uses or is a magnet. If the magnet has one end painted red, that end is traditionally the north pole.

Bar magnets are usually made of ferromagnetic materials, which are elements that can naturally have a magnetic field. They include cobalt, iron, and nickel. Some magnets are made of composite materials that combine ferromagnetic materials with other substances such as aluminum, clay, or resin.

Magnets have uses based on their magnetic attraction. This attraction draws other ferromagnetic materials to the magnet, or the magnet towards them. It can be used to pick up small ferromagnetic items such as screws and metal shavings, as a “magnetic stirring rod” on a laboratory hotplate, and to hold papers and other items to the sides of refrigerators, among many other tasks.

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