Multiple choice

The electric field component of a time harmonic plane EM wave traveling in a nonmagnetic lossless dielectric medium has an amplitude of 1 V/m. If the relative permittivity of the medium is 4, the magnitude of the time-average power density vector (in W/m2) is

  1. $\frac{1}{30 \pi}$
  2. $\frac{1}{60 \pi}$
  3. $\frac{1}{120 \pi}$
  4. $\frac{1}{240 \pi}$
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C Correct answer
Explanation

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