In a variety of things such as electric motors, telephone receivers, tape recorders, and radio and television speakers. They are used as a method of transmittal and help control the intensity of signals.
All kinds of things! Electromagnetic items are primarily used when you only want magnetism for a certain amount of time, like, say, when you want to pick up something with a magnet, then let it drop, like a car in a junkyard.
Also, electromagnets can be used for locks, since a person may want something to be locked most, but not all, of the time.
They are also used in speakers and neon signs. Check the first citation for more info!
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