A-LevelPhysicsElectricity9702/12 · Feb/Mar 2022 · Q291 Mark

For a current-carrying wire, the current can be calculated using the equation shown. I = Anvq What is the meaning of n?

Athe number of charge carriers in the wire

Bthe number of charge carriers multiplied by the volume 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 2022 Paper 1 Variant 2, question 29.

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