A 40 μF40\ \mu\text{F}40 μF capacitor is charged by connecting it to a battery of emf 6.0 V. The initial charge on the capacitor is Q0Q_0Q0. The capacitor is then discharged through a 250 kΩ250\text{ k}\Omega250 kΩ resistor. The time constant for the circuit is TTT. Which statement is correct?
TTT is 10 ms10\text{ ms}10 ms.
Q0Q_0Q0 is 24 μC24\ \mu\text{C}24 μC.
After a time TTT the potential difference across the capacitor is 2.2 V2.2\text{ V}2.2 V.
After a time 2T2T2T the charge on the capacitor is Q0e2Q_0 e^{2}Q0e2.
63 exam-style questions on AQA A Level Physics Capacitance (A-level only), covering Capacitance (A-level only), Parallel plate capacitor (A-level only), Energy stored by a capacitor (A-level only), and Capacitor charge and discharge (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.