Physics 9702 · AS & A Level · Capacitors and capacitance
Capacitors and capacitance — practice question
A student arranges the circuit in Fig. 7.1 in order to measure the charge on capacitor $C$ for a range of potential differences across the capacitor. The way in which the charge $Q$ stored on the capacitor changes with potential difference $V$ is shown in Fig. 7.2.
(a)[2]
State and explain why Fig. 7.2 shows that one of the meters has a systematic error in its readings.
(b)[3]
Use Fig. 7.2 to find the capacitance, in $\mu\text{F}$, of capacitor $C$.
(c)[3]
Use your answer from (b) to find the extra energy stored in capacitor $C$ as the potential difference across it rises from $6.0\,\text{V}$ to $9.0\,\text{V}$.
Worked solution & mark scheme
This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: “The line has a non-zero intercept / it does not pass through the origin” …