Physics (AS & A Level) · Oct / Nov 2019 · Paper 11 · Question 31

The diagram shows the direction of the current in a metal block. The charge carriers enter the block through the face PQRS and leave the block through the opposite face. The number density of charge carriers is n. Each charge carrier has charge e. The average drift speed of the charge carriers is v. Which expression gives the current in the block?

1. Aenvx²
2. Benvxy
3. Cenvx³y²
4. Denvx⁴y

As printed in the paper