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Which of the following is NOT true of the Lorentz force?

  • A.its magnetic part is perpendicular to both the velocity and the field
  • B.its electric part acts whether the charge is moving or not
  • C.it vanishes for a charge moving parallel to a purely magnetic field
  • D.its magnetic part can accelerate a particle along its own direction of motion

Answer: D

The magnetic part is always perpendicular to the velocity, so it can never have a component along the direction of motion and can never change the speed. The other three statements are all correct descriptions of the force.

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