Case study·Hard exam skill (4/5)·Calculator allowed
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
A search coil is connected to a meter and moved through a non-uniform magnetic field. The graph shows the flux through one turn of the coil at different times. The coil has turns.
Total: 5 marks
(a) Find the emf magnitude from 0 to 20 ms. (2 marks)
(b) State the emf from 20 ms to 50 ms. (1 mark)
(c) Compare the sign of emf in the first and last sloping intervals. (2 marks)
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