O-LevelPhysicsMagnetism5054/12 · May/June 2025 · Q341 Mark
Students are asked to suggest factors that affect the speed of rotation of a direct current (d.c.) motor. Three of their suggestions are listed. 1 the strength of the magnetic field 2 the current 3 the number of turns on the coil Which suggestions are correct?
A1, 2 and 3
B1 and 2 only
C1 and 3 only
D2 and 3 only
✓ Correct answer
A: 1, 2 and 3
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