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
For a metal conductor with electron density , cross-sectional area , and electron drift speed , derive the relation between current and drift speed. Hence write the expression for current density.
Total: 5 marks
(a) Derive . (3 marks)
(b) Write the corresponding current density relation. (2 marks)
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