A-LevelPhysicsPhysical quantities and unitsFeb/Mar 2018Paper 1 Q51 Mark
A person calculates the potential difference across a wire by using the measurements shown. Which measured quantity has the greatest contribution to the percentage uncertainty in the calculated potential difference?
Acurrent/A 5.0 ±0.5
Bdiameter of wire/mm 0.8 ±0.1
Clength of wire/m 150 ±5
Dresistivity of metal in wire/Ωm 1.6 x 10⁻⁸ ±0.2 x 10⁻⁸
✓ Correct Answer
The correct answer is B. This question tests the candidate's understanding of physical quantities and units 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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