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The impedance of free space, about 377 ohms, is

  • A.the ratio of the speed of light to the permittivity
  • B.the square root of the ratio of the permeability to the permittivity
  • C.the reciprocal of the square root of their product
  • D.the product of the two free space constants

Answer: B

It is the ratio of the electric to the magnetic field magnitudes in a plane wave in free space, and its value of \( 120\pi \) ohms is worth carrying. The other combination of the same two constants gives the speed of the wave.

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