Viewed along the axle of an electric toothbrush motor, conductor R is to the left of the axle and conductor S is to the right. At this instant, R experiences an upward force and S experiences an equal downward force. Which describes the coil's initial motion?
It starts to rotate anticlockwise about the axle
It moves upwards without rotating
It remains stationary because the forces balance
It starts to rotate clockwise about the axle
86 exam-style questions on Edexcel GCSE Physics 12.3 The motor effect, covering 12.3.1 The motor effect, 12.3.2 Fleming's left-hand rule, 12.3.3 Force on a conductor, and 12.3.4 Electric motors. Each one has a worked solution and a mark scheme showing where the marks go.