FBI mnemonics

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Left hand rule Alternate representation of LHR

The various FBI mnemonics (for electric motors) show the direction of the force on a conductor carrying a current in a magnetic field as predicted by Fleming's left hand rule for motors[1] and Faraday's law of induction.

Other mnemonics exist that use a right hand rule for predicting resulting motion from a preexisting current and field.

## Contents

* 1 Configuration, using the left hand
* 1.1 'FBI'
* 2 Configuration, using the right hand
* 2.1 'FIB'
* 2.2 'IBF'
* 3 Other frequently confused rules
* 3.1 Prediction of direction of field ('B')
* 4 Symmetry
* 5 References
* 6 External links

## Configuration, using the left hand

### 'FBI'

The left hand is held with the thumb, first finger and second finger mutually at right angles.

* The Thumb represents F - Thrust (or resulting Motion).
* The First finger represents B - Field.
* The Second finger represents I or V - Current (in the classical direction, from positive to negative).

## Configuration, using the right hand

Other sources use the right hand to predict force, though the fingers used vary:

### 'FIB'

* Thumb = F ("thrust")
* Index finger = I or V
* Middle finger ("Birdie") = B

### 'IBF'

Right-handed alternate - 'IBF'.

In this alternative, some versions recommend not extending the middle finger, but instead imagining the force coming from the palm of the hand.

* Thumb = I or V
* Index finger = B
* Middle finger = F

## Other frequently confused rules

### Prediction of direction of field ('B')

Prediction of direction of field ('B').

The rules above are usually used to predict 'F' based upon 'B' and 'I' - the force on a moving charge when moving through a field, whether or not the charge is carried in a wire. However, this rule should not be confused with a different right hand grip rule for the prediction of the direction of a field ('B') produced by current ('I') traveling through a wire.

## 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

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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

## References

1. ↑ "Fleming's Left Hand Rule". 5 September 2023. https://shiken.ai/physics/flemings-left-hand-rule.

## External links

* Overview at ac.wwu.edu (Right Hand - 'FIB')
* Diagrams at magnet.fsu.edu. See figure #9. (Left Hand - 'FBI')
* Description at starprof.com (Right Hand - 'IBF' - palm alternative)

* v
* t
* e

Science mnemonics

* CHON
* Clorpt
* ESCAPPM
* FBI
* Left-hand rule
* Right-hand rule
* FOIL
* Four Fs
* List of chemistry mnemonics
* Mnemonics in trigonometry
* OBAFGKM
* Osialfecanakmg
* PEMDAS
* Piphilology
* Planetary mnemonic
* SCORPAN
* SUVAT
* Taxonomy mnemonic
* Thermodynamic square
* Xyzzy

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