Machine-translated by Google. Questions are authored in English.
Top

Discussion

A conductor whose radius is much greater than the skin depth has an alternating resistance

  • A.equal to its direct resistance
  • B.much smaller than its direct resistance
  • C.independent of the frequency of the current
  • D.much greater than its direct resistance

Answer: D

Only a shell of the order of one skin depth carries appreciable current, so the effective cross-section is much smaller than the geometrical one. This is why hollow tubes and stranded conductors are used at radio frequency and why busbars are made flat.

No comment is present. Be the first to comment.
Loading…

Post your comment

Please log in or register to post a comment.