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# Bar Magnet

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 Sub Topics The ancient Greeks discovered that certain kinds of stones attract pieces of iron with a force that is called "magnetic". The Chinese may have discovered this even earlier. Magnetic stones contain iron or other magnetic metals such as nickel and cobalt. The fact that iron and a few other metals can have the property of attracting or repelling each other is called magnetism. It turns out that a piece of iron may be magnetized. If the magnetized iron is in the shape of a long, thin rectangular solid, it is called a bar magnet.

## Definition

Bar magnet is a kind of magnetic material in a shape of the long rectangular solid. Two ends of the bar magnet is north and south pole respectively. The magnetic field direction of a bar magnet is from north pole to the south pole.

## Magnetic Field

We have already noted that the pattern of magnetic field lines of a bar magnet is similar to the pattern of electric field lines near two electric charges. The unit of magnetic field can be denoted in Tesla (T). The magnetic field close to one of the poles of a strong bar magnet has a magnitude of about 1T. The Earth also acts approximately as a bar magnet, with a magnetic field of approximately 50$\mu$T near the Earth surface.