Explain, with the aid of a labelled diagram, how a loudspeaker produces sound. - Leaving Cert Physics - Question vii - 2022
Question vii
Explain, with the aid of a labelled diagram, how a loudspeaker produces sound.
Worked Solution & Example Answer:Explain, with the aid of a labelled diagram, how a loudspeaker produces sound. - Leaving Cert Physics - Question vii - 2022
Step 1
Current in the coil
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Answer
The loudspeaker operates when an alternating current (AC) flows through the coil of wire. This current creates a magnetic field around the coil due to Ampère's law.
Step 2
Creates a magnetic field
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Answer
As the current flows, it produces a magnetic field that interacts with the permanent magnet of the loudspeaker. The direction of the current determines the orientation of the magnetic field.
Step 3
Force produced from the interaction between the two magnetic fields
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Answer
The interaction between the magnetic field created by the coil and the magnetic field of the permanent magnet generates a force. Depending on the direction of the current, this force causes the coil to move in and out.
Step 4
Cone vibrates to produce sound
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Answer
As the coil moves, it pushes and pulls the attached cone, causing it to vibrate. This vibration creates sound waves in the surrounding air, which we hear as sound.
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