Moving coil loudspeaker, diagram
Moving coil loudspeaker. Diagram showing the mechanism of a loudspeaker. A movable coil (red) is attached to a large cone. The coil fits over the central post of a cylindrical permanent magnet (blue). If current flows through the coil, the cone will move. If the current varies rapidly, the cone moves in and out, producing the compressions and rarefactions of a sound wave., by SCIENCE PHOTO LIBRARY
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