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
In three trials, a magnet is (i) held still inside a coil, (ii) pushed into the coil, and (iii) pulled out of the coil. The coil is connected to a centre-zero galvanometer.
Total: 4 marks
(a) In which trial is there no deflection? (1 mark)
(b) How are the deflections in trials (ii) and (iii) related? (1 mark)
(c) Explain the difference using linked magnetic field. (2 marks)
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