When the switch S1 is closed and S2 is open, the capacitor C charges through the resistor R1 = 2.1x105 Ω. When the switch S1 is open while S2 is closed, the capacitor discharges current through the R2= 1x103 Ω. 1) If the capacitor is initially uncharged with C = 9 μF and ε = 750 V, R1 = 2.1x105 Ω, find the voltage of capacitor in 0.25 s when the switch S1 is closed and S2 is open. 2) After the capacitor is fully charged, the switch S1 is open while S2 is closed, if R2 = 1x103Ω, calculate the voltage (in V) across the capacitor after 6.2 ms.

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