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Suppose a current-carrying wire has a cross-sectional area that gradually becomes smaller along the wire, so that the wire has the shape of a very long,truncated cone. How does the drift speed vary along the wire?

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Answer:

It slows down as the cross-section becomes smaller is the correct answer to this question.

Explanation:

  • That current is the same in all parts of the wire under steady-state conditions.
  • Thus the velocity of drift is approximately equal to the cross‐sectional region.
  • vd = I /nAq .
  • As the cross-section gets smaller it accelerates.

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