The diagram shows a d.c. motor.
Which two changes together will always make the coil spin more slowly?
Decrease the current in the coil and use a magnet of less strength.
Decrease the current in the coil and increase the number of turns on the coil.
Increase the current in the coil and use a magnet of less strength.
Increase the current in the coil and decrease the number of turns on the coil.
