Physics (AS & A Level) · Oct / Nov 2021 · Paper 51 · Question 2
9702
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A student investigates the discharge of a capacitor in the circuit shown in Fig. 2.1. V R1 C E R2 P Q Fig. 2.1 The student closes the switch and charges the capacitor. The switch is opened and a stop-watch is started. The capacitor discharges through the two resistors of resistance R1 and R2 connected between P and Q. At a fixed time t the potential difference V across the capacitor is measured. The experiment is repeated for different values of R1 and R2. It is suggested that V, R1 and R2 are related by the equation ln = – t C(R1 + R2) where E is the electromotive force (e.m.f.) of the battery and C is the capacitance of the capacitor. 1 ⎛⎞ ⎝⎠ V E
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2(a)[1]
2(b)[2]
2(c)(i)[2]
2(c)(ii)[2]
2(c)(iii)[2]
2(c)(iv)[2]
2(d)(i)[2]
2(d)(ii)[1]
2(e)[1]
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