Physics (AS & A Level) · Oct / Nov 2023 · Paper 12 · Question 32

The potential difference across a metal wire is kept constant. The length l and the diameter d of the wire are both varied. The type of metal is kept the same. How is the current in the wire related to l and d?

1. AIt is directly proportional to l and inversely proportional to d.
2. BIt is directly proportional to l and inversely proportional to d².
3. CIt is inversely proportional to l and directly proportional to d.
4. DIt is inversely proportional to l and directly proportional to d².

As printed in the paper