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 dipole of moment is placed in a uniform electric field of magnitude .
Total: 5 marks
(a) Find the maximum torque on the dipole. (1 mark)
(b) Find its potential energy when aligned with the field. (2 marks)
(c) Find the work required by an external agent to rotate it slowly from aligned to anti-aligned position. (2 marks)
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