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The loss tangent of a medium is the ratio of

  • A.the conduction current to the displacement current at low frequency
  • B.the imaginary to the real part of the complex permittivity
  • C.the attenuation constant to the phase constant
  • D.the permeability to the permittivity

Answer: B

Writing the permittivity as a complex quantity absorbs both the conduction loss and the dielectric loss into one description, and the tangent of the resulting angle is the loss tangent. Its value decides whether the medium is treated as a dielectric or a conductor.

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