6.14 recall that the force on a current-carrying conductor in a magnetic field increases with the strength of the field and with the current
<<dc motor - factors affecting the speed of a motor interactive.swf>>
Exam style question
· What changes can you make to a simple dc motor to increase the force it can exert? (3 marks)
Model Answer
· Increase the strength of the magnetic field
· Increase the current in the coil
· Increase the number of turns on the coil
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