left-hand rule
  • A rule stating that if the thumb of a left hand is oriented along the same axis as the flow of electrons through a conducting wire, that the fingers of this hand will curl along the same direction as the magnetic field produced by the wire.
  • For a conducting wire moving through a magnetic field, a rule stating that if the middle finger, index finger, and thumb of a left hand are extended at right angles to each other, that the middle finger will indicate the direction of the flow of electrons, the index finger the direction of the magnetic field, and the thumb will indicate the direction of the movement of the wire.

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