Electromagnet

Electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. Electromagnets usually consist of a large number of closely spaced turns of wire that create the magnetic field.

History

The history of electromagnetism dates back to the early 19th century when Danish physicist Hans Christian Ørsted discovered that electric currents create magnetic fields. This discovery led to the development of the electromagnet.

Construction

An electromagnet is made from a coil of wire that acts as a magnet when an electric current passes through it but stops being a magnet when the current stops. Often, the coil is wrapped around a core of "soft" ferromagnetic material such as steel, which enhances the magnetic field produced by the coil.

Applications

Electromagnets are widely used in a variety of applications. They are used in a vast range of devices including hard disks, MRI machines, motors, and generators. They also play a key role in experimental physics.

See also

• Magnetism
• Electromagnetic field
• Electromagnetic induction
• Magnetic core

References

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External links

• WikiMD Article on Electromagnet

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