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Homework Help: Velocity and magnetic force

  1. Sep 18, 2005 #1
    why is the magnitude of velocity of a charged particle not affected by magnetic force? :bugeye:
     
  2. jcsd
  3. Sep 18, 2005 #2

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    The magnetic force always acts in a direction perpendicular to the velocity, sine F=q(vXB), so it only changes the direction of motion, not the speed. This also means it does no work on the particle.
     
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