O-LevelPhysicsMagnetism5054/11 · Oct/Nov 2011 · Q361 Mark
One component of a simple d.c. motor is a split-ring commutator. Which metal is used to make the commutator, and why is this metal chosen?
Ametal: copper, reason: it is a good conductor of electricity
Bmetal: copper, reason: it is a good conductor of heat
Cmetal: iron, reason: it increases the magnetic field strength
Dmetal: iron, reason: it is attracted to the brushes
✓ Correct answer
A: metal: copper, reason: it is a good conductor of electricity
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