Short answer·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
A small bar magnet of magnetic moment is placed in a uniform magnetic field . Consider the cases where is parallel, antiparallel, and perpendicular to .
Total: 4 marks
(a) In which orientations is the torque zero? (1 mark)
(b) In which orientation is the torque maximum? (1 mark)
(c) At an intermediate angle, what is the physical effect of the torque? (2 marks)
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