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The ratio of the transverse electric field to the transverse magnetic field is called as

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  1. waveguide impedance
  2. waveguide wavelength
  3. phase velocity
  4. Poynting vector

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Option 1 : waveguide impedance
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The intrinsic/waveguide impedance is defined as the ratio of the electric field and the magnetic field phasor (complex amplitude), i.e.

For free-space, the intrinsic impedance is a real quantity, i.e.

η  = η0 = 120π

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