Case study·Standard multi-step (3/5)·No calculator
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Question
An aluminium plate swings between the poles of a magnet and slows down rapidly. When slots are cut in the plate, the damping becomes much weaker.
Total: 5 marks
(a) Name the phenomenon responsible for the damping. (1 mark)
(b) State why the induced effect opposes the motion. (2 marks)
(c) Explain why slots reduce the damping. (2 marks)
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