Part 1: A 649-Ω resistor, an uncharged 4.85-μF capacitor, and a 18.8-V emf are connected in series. How long, in ms, after the circuit is connected does the current in the resistor fall by 36.8% of its initial value?  Part 2: A 395-Ω resistor, an uncharged 5.09-μF capacitor, and a 10.5-V emf are connected in series. What is the current, in mA, after 3 time constants is flowing through the resistor? Part 3: A 489-Ω resistor, an uncharged 7.14-μF capacitor, and a 14.6-V emf are connected in series. What is the charge, in microCoulombs, has accumulated in the capacitor after 2 time constant(s)?

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