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A charged particle moving parallel to a magnetic field experiences

  • A.a force proportional to the square of its speed
  • B.no magnetic force at all
  • C.the maximum possible magnetic force
  • D.a force along the direction of motion

Answer: B

The cross product vanishes when the velocity and the field are parallel, so the particle continues in a straight line. The force is greatest when the motion is at right angles to the field, and varies as the sine of the angle between them.

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