Physics (AS & A Level) · May / June 2025 · Paper 13 · Question 32

The current I in a metallic conductor of cross-sectional area A is given by I = Anve where e is the elementary charge and v is the mean drift velocity of the conduction electrons. What is represented by the letter n in the equation?

1. Adensity of conduction electrons
2. Bnumber of conduction electrons per unit time
3. Cnumber of conduction electrons per unit volume
4. Dvolume of conduction electrons

As printed in the paper