Long 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 parallel-plate capacitor is being charged by a steady wire current . Explain why an Amperian loop around the lead gives the same magnetic-field conclusion whether the spanning surface cuts the wire or bulges through the capacitor gap.
Total: 5 marks
(a) Describe the apparent contradiction if only conduction current is used. (2 marks)
(b) State Maxwell's correction in words and connect it to the capacitor gap. (2 marks)
(c) State the value of displacement current in the gap. (1 mark)
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