Monday, 13 October 2014

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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.

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 (mechanical force, magnetic field and electric current). The right and left hand are used for generators and motors respectively.

To work out the  direction  of force experienced we use  Fleming's Left Hand Rule.

  • Your  first  finger points in the  direction of the magnetic field  (North to South).

  • Your  second  finger points in the  direction of conventional current  (positive to negative).

  • Your  thumb  points in the direction of the  thrust or force  on the conductor.

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