Physics 9702 · AS & A Level · Capacitors and capacitance
Capacitors and capacitance — practice question
A student assembles the circuit in Fig. 7.1 in order to measure the charge on a capacitor C for a range of potential differences across the capacitor. Fig. 7.2 shows how the charge Q stored on the capacitor varies with potential difference V.
(a)[2]
State and explain in what way Fig. 7.2 shows that one of the meters has a systematic error in its readings.
(b)[3]
Use Fig. 7.2 to determine the capacitance, in $\mu\text{F}$, of capacitor C.
(c)[3]
Use your answer in (b) to determine the extra energy stored in capacitor C when 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: “Line shows a non-zero intercept / does not pass through the origin” …