A-LevelPhysicsMagnetic fields9702/41 · May/June 2018 · Q106 Marks
10 (a) State Faraday's law of electromagnetic induction. (b) A coil of insulated wire is wound on to one end of a ferrous core and connected to a battery, as shown in Fig. 10.1. [Figure 10.1] An aluminium ring is placed on the core. The ring can move freely along the length of the core. The switch is initially open. Use Faraday's law and Lenz's law to explain why the aluminium ring jumps upwards when the switch is closed.
- (a)State Faraday's law of electromagnetic induction.[2]
- (b)Use Faraday's law and Lenz's law to explain why the aluminium ring jumps upwards when the switch is closed.[4]
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 2018). The mark or mark type is shown in brackets.
- [M1] induced e.m.f. proportional to rate
- [A1] of change of (magnetic) flux (linkage) OR of cutting (magnetic) flux
- [B1] current in coil produces flux
- [B1] (by Faraday's law) changing flux induces e.m.f. in ring
- [B1] current in ring causes field (around ring)
- [B1] (by Lenz's law) field around ring opposes field around coil
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