Why do my headphones have magnets in the earpieces?

Question

this was explained to me once, but i forget...

Answer 1

Speakers are able to create sound by turning electrical signals into sound waves. Sound is produced by vibrating cone in a speaker. The cone is usually made of paper, plastic or metal.
So how does the fluctuation make the speaker coil move back and forth - vibrate? The electromagnet is positioned in a constant magnetic field created by a permanent magnet. These two magnets -- the electromagnet and the permanent magnet -- interact with each other as any two magnets do. The positive end of the electromagnet is attracted to the negative pole of the permanent magnetic field, and the negative pole of the electromagnet is repelled by the permanent magnet's negative pole. When the electromagnet's polar orientation switches, so does the direction of repulsion and attraction. In this way, the alternating current constantly reverses the magnetic forces between the voice coil and the permanent magnet. This pushes the coil back and forth rapidly, like a piston. Thus creating sound.

Answer 2

Without the magnet, your headphone won't generate any sound. The electric current from your music player generates a magnetic field around coil wires around the inside or outside of a magnet. This magnetic field interfact with the magnet to generate vibrations in the plastic/paper that is glued to the coil. This vibration is the sound you hear. Amazing huh?

Answer 3

hmm, cause everyone has a metal in their brain and the headphones stay put better with the magnets in the ear pieces. Give your head a little shake if you don't believe me. There is metal in there.

Answer 4

Speakers have magents in them. The video on this web page explains it pretty well...