Moving coil loudspeaker, diagram
Moving coil loudspeaker. Diagram showing the mechanism of a loudspeaker. A movable coil is attached to a large cone. The coil fits over the central post of a cylindrical permanent magnet. 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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