O-LevelPhysicsElectricity5054/22 · May/June 2024 · Q57 Marks
An initially uncharged rubber balloon is rubbed with a woollen cloth as shown in Fig. 5.1. Rubbing the balloon causes the balloon to have a negative charge. [Figure 5.1]
- (a)(i)On Fig. 5.1, complete the labels on the diagram.[2]
- (a)(ii)Explain why the balloon stays negatively charged for a long time.[2]
- (b)Rubbing the balloon causes the temperature of the air inside it to rise. Explain, in terms of the particles of air, why the volume of the balloon increases when the temperature of the air rises.[3]
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 (May/June 2024). The mark or mark type is shown in brackets.
- 5(a)(i) electrons on both top lines
- 5(a)(i) positive (charge on cloth)
- 5(a)(ii) balloon / rubber / air is an insulator
- 5(a)(ii) electrons / charge unable to move through rubber / balloon / air or little ionisation in air (caused by background radiation)
- 5(b) particles move faster
- 5(b) particles hit sides
- 5(b) particles hit sides more often / more frequently or with greater force
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