Physics (AS & A Level) · Feb / March 2018 · Paper 12 · Question 35

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?

1. Acurrent per unit of cross-sectional area
2. Bpotential difference per unit of length
3. Cresistance and cross-sectional area
4. Dresistivity and length

As printed in the paper