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A charged particle entering a uniform magnetic field at right angles to it moves in

  • A.a parabola, as a projectile does
  • B.a spiral of increasing radius
  • C.a circle at constant speed
  • D.a straight line at constant acceleration

Answer: C

The force is always perpendicular to the velocity, so it supplies exactly the centripetal force of circular motion and does no work. A component of velocity along the field would turn the circle into a helix of constant pitch.

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