A-LevelPhysicsElectricityFeb/Mar 2017Paper 1 Q321 Mark
An electric current I is given in the list of formulae on page 3 as I = Anvq. What do each of the symbols represent for an electric current in a metal wire?
AA: area of cross-section, n: number of free electrons, v: voltage, q: charge of each molecule
BA: area of cross-section, n: number of free electrons per unit volume, v: average drift speed of electrons, q: charge of each electron
CA: current, n: number of free electrons, v: average drift speed of electrons, q: charge of each molecule
DA: current, n: number of free electrons per unit volume, v: voltage, q: charge of each electron
✓ Correct Answer
The correct answer is B. This question tests the candidate's understanding of electricity 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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