How come headphones get a loud high pitch sound whenever they get close to something such as a metal detector?

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How come headphones get a loud high pitch sound whenever they get close to something such as a metal detector?

In: Technology
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Speakers, of which headphones are just tiny ones, are simply a wire surrounded by a magnet. Put electrical pulses through the wire, and connect the end of the wire/magnet thing to a surface that can vibrate, and you have a speaker.

Anything that can mess with a magnet or the electrical current in the wire can mess with the sound.