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A charged particle released from rest in a uniform electric field moves

  • A.in a circle at constant speed about the field direction
  • B.in a parabola
  • C.at constant velocity
  • D.along a straight line with constant acceleration

Answer: D

A uniform field gives a constant force and therefore a constant acceleration along the field for a positive charge. A parabola results only when the particle enters the field with a velocity across it, as in a cathode ray tube.

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