Problem 3: A series RC circuit is built with an R = 12 k resistor and a parallel-plate capacitor with 15-cm-diameter electrodes. An E = 12 V, f = 36 kHz source drives a peak current of I = 0.65 mA through the circuit. What is the spacing between the capacitor plates? Eo to get the capacitance a) Rearrange the formula for the peak current in the RC circuit, I = C in terms of the other parameters. Notice that w in this formula is the angular frequency, not f. √R²+1/0² C² 3 b) Using the formula for the capacitance of a parallel-plate capacitor, C = 0, solve for the distance d between the plates. (Answer: 0.5 mm.)

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