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Q1
A student made a moving-coil loudspeaker.
The figure below shows a diagram of the loudspeaker.
(b) Explain how a moving-coil loudspeaker produces a sound wave.
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(4)
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The current creates a magnetic field around the coil.
This magnetic field interacts with the permanent magnet’s field.
A resultant force is produced, which makes the coil or cone move.
When the direction of the current reverses, the force also reverses,
causing the coil/cone to move back and forth and produce a sound wave.
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