A-LevelPhysicsCapacitanceMay/June 2020Paper 5 Q215 Marks
A student investigates the discharge of a capacitor through a resistor using the circuit shown in Fig. 2.1. [Figure 2.1] The student initially closes the switch and charges the capacitor. The switch is then opened and a stop-watch is started. The capacitor discharges through the resistor. At time t the potential difference V across the capacitor is measured. It is suggested that V and t are related by the equation V = (Q₀/C)e^(-t/RC) where Q₀ is the charge of the fully charged capacitor, C is the capacitance of the capacitor and R is the resistance of the resistor.
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