Fleming's right hand rule
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Fleming's right hand rule (for generators) shows the direction of induced current flow when a conductor moves in a magnetic field.
The right hand is held with the thumb, first finger and second finger mutually at right angles, as shown in the diagram .
- The Thumb represents the direction of Motion of the conductor.
- The First finger represents the direction of the Field.
- The Second finger represents the direction of the induced or generated Current (in the classical direction, from positive to negative).
- One particular way of remembering the rule is the "FBI" acronym for Force(or otherwise motion), B as the magnetic field sign and I as the current. The subsequent letters corespond to subsequent fingers, counting from the top. Thumb -> F; First finger -> B; Second finger -> I
There is also a Fleming's left hand rule (for electric motors). The appropriately-handed rule can be recalled from the letter "g", which is in "right" and "generator".
These mnemonics are named after British engineer John Ambrose Fleming, who invented them.
[edit] Symmetry
| Vector | Left-Motor or Right-Generator | Left-Motor or Right-Generator | Left-Motor or Right-Generator | Right-Motor or Left-Generator | Right-Motor or Left-Generator | Right-Motor or Left-Generator |
|---|---|---|---|---|---|---|
| B or Field | First or Index | Thumb | Fingers or Palm | First or Index | Thumb | Fingers or Palm |
| I or Current (+ to - flow) | Fingers or Palm | First or Index | Thumb | Thumb | Fingers or Palm | First or Index |
| Force, Motion, or Thrust | Thumb | Fingers or Palm | First or Index | Fingers or Palm | First or Index | Thumb |
