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 student sketches field lines for a long straight solenoid carrying steady current.
Total: 3 marks
(a) Describe the magnetic field inside the solenoid, away from the ends. (1 mark)
(b) What happens to the direction of the field if the current is reversed? (1 mark)
(c) Why is the field outside a long solenoid comparatively weak? (1 mark)
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