Charge carriers, each carrying charge $q$, travel along a wire of fixed length. The number density of the charge carriers in the wire is $n$. What other information is needed, for this wire, to find 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