Physics (AS & A Level) · May / June 2021 · Paper 13 · Question 33

A wire has a length of 12 cm and contains a total of 5.1 × 10^22 free electrons. When a potential difference is applied across the ends of the wire, the free electrons move with an average drift speed of 4.0 × 10^-6 m s^-1. What is the current in the wire?

1. A0.0027 A
2. B0.0039 A
3. C0.27 A
4. D0.39 A

As printed in the paper