Asked by a
What causes the poles of the electromagnet in an audio speaker to repeatedly switch directions?
a metal striker that pulls on the magnet
a diaphragm that vibrates around the magnet
a current that rapidly switches direction
a device that opens and closes a circuit
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GPT-5 mini
AI
a current that rapidly switches direction
The audio signal is an alternating current through the speaker's voice coil. When the current reverses, the coil's magnetic polarity reverses, producing forces against the permanent magnet that drive the diaphragm back and forth.
The audio signal is an alternating current through the speaker's voice coil. When the current reverses, the coil's magnetic polarity reverses, producing forces against the permanent magnet that drive the diaphragm back and forth.
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