bank of batteries, total emf ε = 4.5 V, is connected with resistor R = 120 kΩ, capacitor C = 680 pF, and two-pole switch S as shown. The switch is initially set to point b so that the resistor and capacitor are in series. The switch is left in this position for a sufficiently long time so that the capacitor is completely discharged. Calculate the voltage drop across the capacitor (in volts) at time t = 210 μs after the switch is connected to point a.

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