Fleming's left-hand rule (for motors), and Fleming's right-hand rule (for generators) are a pair of visual mnemonics. They were originated by John Ambrose Fleming, in the late 19th century, as a simple way of working out the direction of motion in an electric motor, or the direction of electric current in an electric generator
Rule
When current flows in a wire, and an external magnetic field is
applied across that flow, the wire experiences a force perpendicular
both to that field and to the direction of the current flow. A left hand
can be held, as shown in the illustration, so as to represent three
mutually orthogonal axes on the thumb, first finger and middle finger.
Each finger is then assigned to a quantity (electric current, magnetic
field and mechanical force). The right and left hand are used for
generators and motors respectively.
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