A-LevelPhysicsAlternating currents9702/41 · May/June 2017 · Q96 Marks
A simple transformer is illustrated in Fig. 9.1. [Figure 9.1]
- (a)(i)State why the transformer has an iron core, rather than having no core.[1]
- (a)(ii)Explain why the core is laminated.[2]
- (b)By reference to the action of a transformer, explain why the input to the transformer is an alternating voltage, rather than a constant voltage.[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 2017). The mark or mark type is shown in brackets.
- [B1] core reduces loss of (magnetic) flux linkage/improves flux linkage
- [B1] reduces (size of eddy) currents in core
- [B1] (so that) heating of core is reduced
- [M1] alternating voltage gives rise to changing magnetic flux in core
- [A1] (changing) flux links the secondary coil
- [B1] induced e.m.f. (in secondary) only when flux is changing/cut
Write your answer and get it marked
On Oracle Prep you can write or photograph your own answer and have it marked by AI against this mark scheme, with feedback on what you missed.
Sign up free →