A-LevelPhysicsPhysical quantities and units9702/12 · Feb/Mar 2021 · Q51 Mark

A student measures the current and the potential difference for a resistor in a circuit. current = (50.00 ± 0.01) mA potential difference = (500.0 ± 0.1)mV The measurements are used to calculate the resistance of the resistor. What is the percentage uncertainty in the calculated resistance?

A0.0002%

B0.0004%

C0.02%

D0.04%

✓ Correct answer

D: 0.04%

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Topic: Physical quantities and units, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2021 Paper 1 Variant 2, question 5.

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