A-LevelPhysicsD.C. circuitsFeb/Mar 2021Paper 1 Q351 Mark
An electrical cable consists of seven strands of copper wire, each of diameter 0.30 mm, connected in parallel. The resistivity of copper is 1.72 × 10⁻⁸ Ω m. The current in the cable is 13 A. What is the potential difference (p.d.) between two points on the cable a distance of 1.0 m apart?
A0.0045 V
B0.11 V
C0.45 V
D3.2 V
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The correct answer is C. This question tests the candidate's understanding of d.c. circuits 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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