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The capacitance between two parallel wires of a transmission line depends on their spacing through

  • A.the square of the spacing between them
  • B.the difference between the spacing and the radius
  • C.a logarithm of the ratio of spacing to radius
  • D.the ratio of spacing to radius directly

Answer: C

The two-wire arrangement is closely analogous to the coaxial one, both giving a logarithmic result because the field of a line charge falls as the inverse first power. This is why line capacitance changes only slowly as conductors are spaced further apart.

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