An electrically charged particle enters a uniform magnetic field in a direction perpendicular to the field with a velocity $v$. Then,it travels

  • A
    in a straight line without acceleration
  • B
    with force in the direction of the field
  • C
    in a circular path with a radius directly proportional to $v^2$
  • D
    in a circular path with a radius directly proportional to its velocity

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