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
The graph shows how magnetisation of a ferromagnetic sample changes as temperature is raised. The dashed line marks the Curie temperature .
Total: 5 marks
(a) What happens to magnetisation as temperature approaches ? (1 mark)
(b) What is the magnetic behaviour above ? (2 marks)
(c) Why is this effect important while choosing a permanent magnet for high-temperature use? (2 marks)
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