Fleming's Left Hand Rule

We have three directions to worry about: current, field and force. At GCSE we make sure the wire is held at 90° to the direction of the field. This makes life easier: the force is either up or down.

Current: dc - this is always from + to - Field: direction is always from N to S. Force: depends on how the other two align.

The left hand rule can be used to show how these three are related in a motor.

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