A-LevelPhysicsElectricity9702/12 · Oct/Nov 2025 · Q331 Mark
A piece of wire X has resistivity ρ, length L and cross-sectional area A. Wire X has a resistance R. A second piece of wire Y is made of a different metal. It has the same resistance as X but has twice the length of X. Which row gives possible values for the resistivity and the cross-sectional area of Y?
A1/2 ρ, A
Bρ, 1/2 A
Cρ, A
D2ρ, A
✓ Correct answer
B: ρ, 1/2 A
Practise more questions on this topic
Oracle Prep sorts past-paper questions by topic, so you can drill Electricity and see which topics are most likely to come up next.
Sign up free →