Fleming's left hand rule
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Fleming's left hand rule (for electric motors) shows the direction of the thrust on a conductor carrying a current in a magnetic field.
The left hand is held with the thumb, index finger and middle finger mutually at right angles.
- The First finger represents the direction of the Field.
- The Second finger represents the direction of the Current (in the classical direction, from positive to negative).
- The Thumb represents the direction of the Thrust or resultant Motion.
There also exists Fleming's right hand rule (for generators). The appropriately-handed rule can be recalled by remembering that the letter "g" is in "right" and "generator".
Both mnemonics are named after British engineer John Ambrose Fleming who invented them.
Other mnemonics also exist that use a left hand rule or a right hand rule for predicting resulting motion from a pre-existing current and field.
