- #1
wlng81
- 6
- 0
Dear all, I have encountered an issue in understanding how microphone works and I hope you guys can assist.
There are two scenarios involved.
In the first scenario, there is tuning fork and a microphone. The microphone contains a small disc attached to a magnet and a fixed coil. (Please refer to here: http://www.flickr.com/photos/11353862@N02/10851144236/)
It is mentioned when the tuning fork vibrates, an alternating induced emf is induced in the coil.
In the second scenario, the tuning fork is replaced a source that produces a sound of greater loudness but the same pitch.
The question is: How will the amplitude of the induced emf change?
I had thought the magnitude induced emf should remain the same since the pitch (hence frequency -> rate of change of magnetic flux) was the same. But I also came across some audio websites saying the amplitude induced emf would increase.
As a result, I am utterly confused now...
There are two scenarios involved.
In the first scenario, there is tuning fork and a microphone. The microphone contains a small disc attached to a magnet and a fixed coil. (Please refer to here: http://www.flickr.com/photos/11353862@N02/10851144236/)
It is mentioned when the tuning fork vibrates, an alternating induced emf is induced in the coil.
In the second scenario, the tuning fork is replaced a source that produces a sound of greater loudness but the same pitch.
The question is: How will the amplitude of the induced emf change?
I had thought the magnitude induced emf should remain the same since the pitch (hence frequency -> rate of change of magnetic flux) was the same. But I also came across some audio websites saying the amplitude induced emf would increase.
As a result, I am utterly confused now...