A-LevelPhysicsElectricity9702/12 · May/June 2012 · Q331 Mark
Two copper wires of the same length but different diameters carry the same current. Which statement about the flow of charged particles through the wires is correct?
ACharged particles are provided by the power supply. Therefore the speed at which they travel depends only on the voltage of the supply.
BThe charged particles in both wires move with the same average speed because the current in both wires is the same.
CThe charged particles move faster through the wire with the larger diameter because there is a greater volume through which to flow.
DThe charged particles move faster through the wire with the smaller diameter because it has a larger potential difference applied to it.
✓ Correct answer
D: The charged particles move faster through the wire with the smaller diameter because it has a larger potential difference applied to it.
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