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Electromagnetic coil
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===Transducer coils=== [[Image:Metal detecting in progress on a Time Team dig.jpg|thumb|upright=0.7|The sensor coil of a [[metal detector]].]] These are coils used to translate time-varying magnetic fields to electric signals, and vice versa. A few types: :*Sensor or pickup coils - these are used to detect external time-varying magnetic fields :*[[Inductive sensor]] - a coil which senses when a magnet or iron object passes near it :*[[Recording head]] - a coil which is used to create a magnetic field to write data to a [[magnetic storage]] medium, such as [[magnetic tape]], or a [[hard disk]]. Conversely it is also used to read the data in the form of changing magnetic fields in the medium. :*[[Induction heating|Induction heating coil]] - an AC coil used to heat an object by inducing [[eddy current]]s in it, a process called [[induction heating]]. :*[[Loop antenna]] - a coil which serves as a [[antenna (radio)|radio antenna]], to convert radio waves to electric currents. :*[[Rogowski coil]] - a toroidal coil used as an AC measuring device :*[[Pickup (music technology)|Musical instrument pickup]] - a coil used to produce the output [[audio signal]] in an [[electric guitar]] or [[electric bass]]. :*[[Flux-gate magnetometer|Flux gate]] - a sensor coil used in a [[magnetometer]] :*[[Magnetic cartridge|Magnetic phonograph cartridge]] - a sensor in a [[record player]] that uses a coil to translate vibration of a needle to an audio signal in playing vinyl [[phonograph record]]s. There are also types of coil which don't fit into these categories.
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