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The magnetic force on a charged particle does

  • A.no work, being always perpendicular to the motion
  • B.work equal to the change in the particle's kinetic energy
  • C.negative work, always slowing the particle down
  • D.work proportional to the flux density and the distance travelled

Answer: A

A force at right angles to the displacement contributes nothing to the work integral, so the speed and the kinetic energy are unchanged however long the particle spends in the field. Only the electric part of the Lorentz force can change a particle's energy.

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