A-LevelPhysicsElectricityFeb/Mar 2019Paper 1 Q351 Mark
A wire of cross-sectional area 5.0 × 10⁻⁶ m² is made of a metal of resistivity 50 × 10⁻⁸ Ω m. The potential difference across the wire is 6.0 V and the current is 3.0 A. What is the length of the wire?
A0.050 m
B0.20 m
C5.0 m
D20 m
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The correct answer is D. This question tests the candidate's understanding of electricity within the Physicssyllabus. The examiner's mark scheme requires...
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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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