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A 12.9 kΩ resistor and a capacitor are connected in series andthen a 12.0 V potential difference is suddenly applied across them.The potential difference across the capacitor rises to 4.50 V in1.49 µs.

(a) Calculate the time constant of the circuit (in μs).

(b) Find the capacitanceof the capacitor in nanofarads.

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