A-LevelPhysicsCapacitance9702/42 · Oct/Nov 2020 · Q67 Marks
A student has available three capacitors, each of capacitance 12 μF. Draw diagrams, one in each case, to show how the student connects the capacitors to give a combined capacitance between the terminals of:
- (a)(i)Define the capacitance of a parallel plate capacitor.[2]
- (a)(ii)State three functions of capacitors in electrical circuits.[3]
- (b)(i)18 μF[1]
- (b)(ii)8 μF.[1]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
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 between the plates
- [B3] any three points from: • smoothing • timing/(time) delaying • tuning • oscillator • blocking d.c. • surge protection • temporary power supply
- [B1] parallel combination of two in series and a single capacitor
- [B1] one capacitor in series with two in parallel
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