Physics (AS & A Level) · Oct / Nov 2018 · Paper 11 · Question 33

When there is a current of 5.0 A in a copper wire, the average drift velocity of the free electrons is 8.0 × 10⁻⁴ m s⁻¹. What is the average drift velocity in a different copper wire that has twice the diameter and a current of 10.0 A?

1. A4.0 × 10⁻⁴ m s⁻¹
2. B8.0 × 10⁻⁴ m s⁻¹
3. C1.6 × 10⁻³ m s⁻¹
4. D3.2 × 10⁻³ m s⁻¹

As printed in the paper