Physics 9702 · AS & A Level · Capacitors and capacitance
Capacitors and capacitance — practice question
Capacitors P and Q, each with capacitance $C$, are linked in series to a battery of e.m.f. $9.0\,\text{V}$, as illustrated in Fig. 6.1. A switch $S$ is used to place either a third capacitor $T$, which also has capacitance $C$, or a resistor $R$, in parallel with capacitor P.
(a(i))[2]
With switch $S$ at X, Calculate the combined capacitance, in terms of $C$, for the three capacitors.
(a(ii))[2]
With switch $S$ at X, Calculate the potential difference across capacitor Q. Explain your working.
(b)[4]
When switch $S$ is moved to position Y, State what happens to the potential difference across capacitor P and across capacitor Q.
Worked solution & mark scheme
This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Hence, $1/T = 1/(2C) + 1/C$” …