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When you plug the headphone cable in to your sound source, the sound (in the form of an electric current) goes out the wire, through the coil, and out the other end. When electric current goes through a coil of wire, the coil of wire becomes an electro-magnet. When electric current goes around the loop clockwise there is a south magnetic pole nearest you; when the electric current reverses there is a north magnetic pole.

When the south magnetic pole of a magnet is near the coil of wire it will attract a north pole and repel a south pole of the coil electromagnet. The coil will move toward and away from the magnet, depending on the direction of the electric current. Because the coil is attached to the cup, the cup will also move toward and away from the magnet.

The bottom of the cup will push air back and forth, creating sounds that will travel through the air to your ear. The bare wire itself does not move much air, and so does not make much sound. However, if the coil is attached to a large, low-mass material, it will vibrate that material, which in turn will vibrate the air, making a louder sound.

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