A-LevelPhysicsElectricity9702/12 · Feb/Mar 2018 · Q351 Mark
Charge carriers, each of charge q, move along a wire of fixed length. The number density of the charge carriers in the wire is n. What is also required, for this wire, to determine the average drift velocity of the charge carriers in terms of n and q?
Acurrent per unit of cross-sectional area
Bpotential difference per unit of length
Cresistance and cross-sectional area
Dresistivity and length
✓ Correct answer
A: current per unit of cross-sectional area
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