The Left Hand Rule
Background Information
The Left Hand Rule
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Fleming used his left hand to determine the direction of the electromagnetic force exerted on a current-carrying conductor in a magnetic field.
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Stretch the thumb, the index finger and the middle finger of your left hand as shown on the diagram.
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When the middle finger is pointing in the direction of current flow and the index finger is pointing in the direction of the magnetic flux, the direction of the force is given by the thumb.