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The permeability of free space has the value

  • A.\( 3 \times 10^{8} \) H/m
  • B.\( 4\pi \times 10^{-7} \) H/m
  • C.\( 8.85 \times 10^{-12} \) H/m
  • D.\( 9 \times 10^{9} \) H/m

Answer: B

It was formerly exact by the definition of the ampere, and it combines with the permittivity to give the speed of light as the reciprocal of the square root of their product. That relation is one of the great results of Maxwell's theory.

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