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Consider a capacitor C being discharged through a resistor R as shown in figure a. The initial potential difference across the capacitor is 24.0 V, the capacitance is 4.00 10-6 F, and the resistance is 2.50 ?.

(a) How long does it take for the charge on the capacitor to drop to one-fourth of its initial value?

(b) Compute the initial charge and time constant.

Q =

? =

(c) How long does it take to discharge all but the last quantum of charge, 1.6 10-19 C? (Assume an exponential decrease during the entire discharge process.)

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