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A dart leader differs from a stepped leader in that it

  • A.travels smoothly down an existing ionised channel
  • B.descends in discrete steps through unionised air
  • C.travels upward from the ground to the cloud
  • D.carries no measurable current whatsoever

Answer: A

The channel is still partly ionised from the previous stroke, so no stepping is needed. Dart leaders therefore travel considerably faster than the original stepped leader. No stepping is needed through partly ionised air.

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