why magnet is used in spaekers?

magnet is used in the backside of speakers.What is function of magnet in speaker?

Find your answer here -

http://en.wikipedia.org/wiki/loudspeaker...

http://electronics.howstuffworks.com/spe... it helps in creating different vibrations in the diaphragm of the speakers and generate sound out of the signals received from the music system... permanent magnets are used in speakers , It is used to create the movement of the coil and the cone which produces the sound Hello mate...heres why and how magnets are used...

The traditional design includes a lightweight semi-rigid cone, a coil of fine wire (usually copper), a circular magnet, and a rigid support structure.

The coil (known as the voice coil) is attached to the apex of the cone. A "gap" is a small circular hole, slot or groove which allows the voice coil and cone to move back and forth. The coil is oriented coaxially inside the gap. The gap is established between a permanent magnet and a center post (a.k.a. "pole-piece"). The center post and back-plate are sometimes a single piece called the "yoke". The gap is where the magnetic field is most concentrated. One magnetic pole is outside the coil, whilst the other is inside the voice coil. In addition to these components, a dynamic speaker also includes a suspension system to keep the coil centered and to make the speaker components return to a neutral point after moving. A typical suspension system includes the spider (a.k.a. "damper"), which is at the apex of the cone, often of "concertina" form; and the surround (a.k.a. "bellows"), which is usually made of rubber and affixed at the outer circumference of the cone. The parts are held together by a chassis or basket (a.k.a "frame"). When an electrical signal is applied, a magnetic field is induced by the electric current in the coil which becomes an electromagnet.