Physics for IGCSE & O level - Magnets And Currents (Section 1 - No. 47)
What increases the turning effect on the coil in an electric motor?
Increasing the current in the coil
Using a stronger magnet
Increasing the number of turns on the coil
Decreasing the length of wire in the magnetic field
Explication
The turning effect (torque) in an electric motor can be increased by increasing the current, using a stronger magnet, or increasing the number of turns on the coil. Reducing wire length decreases force.