Long answer·Hard exam skill (4/5)·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
Describe the working of a simple DC motor using the ideas of magnetic force, commutator and energy conversion.
Total: 5 marks
(a) State the energy conversion. (1 mark)
(b) Explain how force acts on the two arms of the coil. (2 marks)
(c) Explain the role of the commutator in continuous rotation. (2 marks)
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