Fleming's right-hand rule

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Fleming's right hand rule

Fleming's right hand rule (for generators) shows the direction of induced current when a conductor moves in a magnetic field.

The right hand is held with the thumb, first finger and second finger mutually perpendicular to each other (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. (north to south)
  • The Second finger represents the direction of the induced or generated Current (the direction of the induced current will be the direction of conventional current; 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 correspond to subsequent fingers, counting from the top. Thumb -> F; First finger -> B; Second finger -> I

These mnemonics are named after British engineer John Ambrose Fleming, who invented them.

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