ON22 P42 Q6 Capacitor Discharge Graphs
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9702/42/O/N/22: A capacitor of capacitance C and a resistor of resistance R are connected as shown in Fig. 6.1. Initially, the capacitor is charged and the switch is open. The switch is closed at time t = 0. Fig. 6.2 and Fig. 6.3 show, respectively, the variations with t of the charge Q on the capacitor and the potential difference (p.d.) V across the resistor. #9702w22p42 #Lv2
(a) Explain the shape of the line in Fig. 6.3 representing the variation of V with t.
(b) Use Fig. 6.2 to show that the time constant of the circuit in Fig. 6.1 is 5.5 s.
(c) Use Fig. 6.2, Fig. 6.3 and the information in (b) to determine:
(i) capacitance C, in μF
(ii) resistance R, in kΩ.
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