Physics · May / June 2025 · Paper 12 · Question 34

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?

1. A1, 2 and 3
2. B1 and 2 only
3. C1 and 3 only
4. D2 and 3 only

As printed in the paper