A-LevelPhysicsPhysical quantities and units9702/12 · Feb/Mar 2018 · 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

B: diameter of wire/mm 0.8 ±0.1

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Topic: Physical quantities and units, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2018 Paper 1 Variant 2, question 5.

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