Electromagnets | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-01-16

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Electromagnet


00:01:21 1 History
00:03:24 2 Uses of electromagnets
00:04:49 3 Simple solenoid
00:09:07 4 Physics
00:10:49 4.1 Ampere's law
00:12:27 4.2 Magnetic core
00:14:29 4.3 Magnetic circuit – the constant iB/i field approximation
00:17:48 4.4 Magnetic field created by a current
00:22:35 4.5 Force exerted by magnetic field
00:25:27 4.6 Closed magnetic circuit
00:27:27 4.7 Force between electromagnets
00:29:14 5 Side effects
00:29:35 5.1 Ohmic heating
00:31:20 5.2 Inductive voltage spikes
00:33:25 5.3 Lorentz forces
00:35:01 5.4 Core losses
00:37:21 6 High field electromagnets
00:37:31 6.1 Superconducting electromagnets
00:38:44 6.2 Bitter electromagnets
00:40:12 6.3 Explosively pumped flux compression
00:41:28 7 Definition of terms
00:41:37 8 See also



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SUMMARY
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An 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 wire wound into a coil.  A current through the wire creates a magnetic field which is concentrated in the hole in the center of the coil.   The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes a more powerful magnet.
The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet that needs no power, an electromagnet requires a continuous supply of current to maintain the magnetic field.
Electromagnets are widely used as components of other electrical devices, such as motors, generators, electromechanical solenoids, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment.  Electromagnets are also employed in industry for picking up and moving heavy iron objects such as scrap iron and steel.