Physics (AS & A Level) · Feb / March 2023 · Paper 42 · Question 5

A capacitor, a battery of electromotive force (e.m.f.) 12 V, a resistor R and a two-way switch are connected in the circuit shown in Fig. 5.1. 12 V T S R Fig. 5.1 The switch is initially in position S. When the capacitor is fully charged, the switch is moved to position T so that the capacitor discharges. At time t after the switch is moved the charge on the capacitor is Q. The variation with t of ln (Q / μC) is shown in Fig. 5.2. 3 2 1 0 0 1 2 3 4 5 t / s ln (Q /μC) Fig. 5.2

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