![]() ![]() We can also make a microphone in a similar way: its vibration against the permanent magnet, picked up from the vibration of the surround air, causes the electromagnet to move, which creates electricity. This is a speaker: it causes the air around it to vibrate. We can use an electromagnet to create sound from electricity: by placing a coil of wire near a permanent magnet, attaching a paper cone to it, and then turning electricity to it off and on very quickly. That vibration causes the surrounding air to vibrate: sound! Much like our larynx can create sound by creating vibrations, our ears can pick up those vibrations. Audio, or sound, is a variation of air pressure, caused by the vibration of an object, like vocal cords or a guitar string or a hammer hitting a nail.
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