1. The problem statement, all variables and given/known data A parallel plate capacitor having two square plates each of side length 10mm has a plate separation of 100μm. It is used to make a microphone where the sound waves cause the plate separation to change by +/- 10μm. The microphone capacitor is connected in series with a constant 1 volt d.c. source of zero internal impedance and an amplifier with an input that can be regarded as a 10pF capacitor, the three components forming a complete circuit. What is the peak to peak input voltage of the amplifier caused by the plate movement of +/-10μm ? Assume the capacitor microphone has its gap filled with air. 2. Relevant equations ε = 8.854 x 10^-12 3. The attempt at a solution Having a bit of trouble. I'm not sure where exactly to start. Q = CV where C = epsilon x A/d A change in plate seperation cause a change in charge across the plates. But I'm looking for a change in voltage. Any ideas are appreciated.