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A capacitor with an initial potential difference of 75 V isdischarged through a resistor when a switch between them is closedat t = 0. At t = 5.0 s, the potential differenceacross the capacitor is 1.70 V.
(a) What is the time constant of the circuit?
(b) What is the potential difference across the capacitor att = 15.0 s?

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