Case study·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
A straight conductor is placed east-west in a magnetic field directed towards north. Current flows from west to east.
Total: 4 marks
(a) Use Fleming's left-hand rule to state the force direction. (1 mark)
(b) State what happens to the force direction if the current is reversed. (1 mark)
(c) State the conductor orientation for which the force would be zero. (2 marks)
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