Physics (AS & A Level) · Oct / Nov 2023 · Paper 52 · Question 2
9702
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A student investigates the discharge of capacitors in the circuit shown in Fig. 2.1. V R CA CB Fig. 2.1 The capacitors have capacitances CA and CB. The student closes the switch to charge the capacitors. The switch is opened and a stop-watch is started. The capacitors discharge through the resistor of resistance R. At a fixed time t the voltmeter reading V is recorded. The experiment is repeated for different values of CA and CB. For each combination of CA and CB, the combined capacitance C is calculated. It is suggested that C and V are related by the equation V = I0Re _ t CR where I0 is the initial current in the resistor. 1
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