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Litz wire reduces the alternating resistance of a coil by

  • A.using many fine strands transposed so each takes its turn at the surface
  • B.using a single thick conductor of large surface area
  • C.using a hollow conductor with the interior removed
  • D.using a material of higher conductivity than copper

Answer: A

Each strand is thinner than a skin depth and the transposition means no strand stays in the low-current interior, so the whole cross-section is used. It is effective up to a few hundred kilohertz, above which the strand insulation and capacitance become the limiting factors.

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