A-LevelPhysicsElectricity9702/12 · Feb/Mar 2021 · Q321 Mark

The current I in a metal wire is given by the equation I = Anvq. What does the symbol n represent?

Athe number of charge carriers in the wire

Bthe number of charge carriers per unit cross-sectional area of the wire

Cthe number of charge carriers per unit length of the wire

Dthe number of charge carriers per unit volume of the wire

✓ Correct answer

D: the number of charge carriers per unit volume of the wire

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Topic: Electricity, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2021 Paper 1 Variant 2, question 32.

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