A-LevelPhysicsCapacitance9702/41 · Oct/Nov 2020 · Q67 Marks
Define the capacitance of a parallel plate capacitor.
- (a)(i)Define the capacitance of a parallel plate capacitor.[2]
- (a)(ii)State three functions of capacitors in electrical circuits.[3]
- (b)A student has available four capacitors, each of capacitance 24 µF. The capacitors are connected as shown in Fig. 6.1. [Figure 6.1]. Calculate the combined capacitance between the terminals X and Y.[2]
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Mark scheme
Marking points from the official mark scheme (Oct/Nov 2020). The mark or mark type is shown in brackets.
- [M1] charge per unit potential (difference)
- [A1] charge on one plate and potential difference across the plates
- [B3] any three points from: smoothing / timing/(time) delay / tuning / oscillator / blocking d.c. / surge protection / temporary power supply
- [C1] (capacitors in series have combined capacitance =) 8 μF
- [A1] capacitance = 8 + 24 = 32 μF
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