A-LevelPhysicsElectricityOct/Nov 2023Paper 1 Q321 Mark
The potential difference across a metal wire is kept constant. The length l and the diameter d of the wire are both varied. The type of metal is kept the same. How is the current in the wire related to l and d?
AIt is directly proportional to l and inversely proportional to d.
BIt is directly proportional to l and inversely proportional to d².
CIt is inversely proportional to l and directly proportional to d.
DIt is inversely proportional to l and directly proportional to d².
✓ Correct Answer
The correct answer is D. This question tests the candidate's understanding of electricity within the Physicssyllabus. The examiner's mark scheme requires...
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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