A capacitive microphone consists of two thing disks of aluminum with diameter 3.

Question

A capacitive microphone consists of two thing disks of aluminum with diameter 3.0m, one fixed, the other attached to a diaphragm that vibrates in response to acoustical waves. The space between the plates if filled with a substrate with a dielectric constant K=175.3 A) If the distance between the plates is 10.0mm when no acoustical waves are present, what is the capacitance of the device? B) If acoustic waves cause the diaphragm (and the attached plate) to vibrate with an amplitude of 1.00micron, and each plate carries a charge of 1.88x10^-13, what is the amplitude (change V) of the voltage signal? ---> A) I got 2.4x10^-9F, and got partial credit ---> B) I got 7.83x10^-5V and got less credit. Please and thank you!

Explanation / Answer

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