A-LevelPhysicsMagnetic fieldsMay/June 2018Paper 4 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.
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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