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SOLVED: A capacitive microphone can be modeled as shown in the schematic below. The microphone consists of an electrical circuit (with input voltage V, inductance L, resistance R), and variable capacitance C(z). Sound waves exert a time-varying force Fs(t) on the movable capacitor plate, which has a mass (m) and is connected to the housing via a spring (k) and damper (b). The variable capacitance is a function of the plate gap z(t):Where ε is the dielectric constant and A is the area of the cap

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