O-LevelPhysicsElectricity5054/22 · May/June 2019 · Q84 Marks
Fig. 8.1 shows a device that is used to show the force on an electron in an electric field. [Figure 8.1]
- (a)Explain how a continuous flow of electrons from the filament is produced in this apparatus.[2]
- (b)When an electron is in an electric field there is a force on the electron. The direction of this force is in the opposite direction to the electric field. Describe how the metal plates in Fig. 8.1 can be used to show this.[2]
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 2019). The mark or mark type is shown in brackets.
- [B1] filament is heated / hot (emits electrons)
- [B1] or thermionic emission occurs at the filament
- [B1] cylinder / anode attracts / accelerates electrons
- [B1] connect a battery / p.d. / voltage / power supply across plates
- [B1] electrons deflect / attract towards positive / away from negative
- [B1] or field is from positive to negative
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