O-LevelPhysicsMagnetism5054/22 · Oct/Nov 2018 · Q76 Marks
Fig. 7.1 shows the structure of a transformer. A lamp is connected to the secondary coil. [Figure 7.1]
- (a)Explain why the core of the transformer is made from iron.[2]
- (b)(i)When there is an alternating current (a.c.) in the primary coil, the lamp is lit. When there is a direct current (d.c.) in the primary coil, the lamp is not lit. State two ways in which an alternating current differs from a direct current. 1. 2.[2]
- (b)(ii)Explain why the lamp is not lit when there is a direct current in the primary coil.[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 (Oct/Nov 2018). The mark or mark type is shown in brackets.
- [1] magnetic (material)
- [1] temporary / soft magnetic (material)
- [1] it/a.c. changes direction or changes polarity / from positive to negative (continually)
- [1] it/a.c. has varying size or is sinusoidal / like a sine wave
- [1] magnetic field (in core / secondary coil) is not changing / remains constant
- [1] no (electromagnetic) induction
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