A-LevelPhysicsElectricity9702/12 · May/June 2019 · Q341 Mark
Four wires are made of the same metal. The cross-sectional areas, lengths and thermodynamic temperatures of the wires are shown. Which wire has the largest resistance?
Across-sectional area: A, length: 2L, temperature: 2T
Bcross-sectional area: A, length: L, temperature: T
Ccross-sectional area: 2A, length: 2L, temperature: 2T
Dcross-sectional area: 2A, length: L, temperature: T
✓ Correct answer
A: cross-sectional area: A, length: 2L, temperature: 2T
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