Discussion
Consider the following statements about a plane wave in a lossless medium.
1. The two fields are in phase 2. The wave is transverse in both fields 3. The intrinsic impedance is complex
Answer: D
Correct answer: 1 and 2 only are correct
Statements 1 and 2 are correct: in a lossless medium the electric and magnetic fields are exactly in phase, and both lie transverse to the direction of travel. Statement 3 is wrong - \( \eta = \sqrt{\mu/\epsilon} \) is purely real when there is no loss, and it is exactly that reality which puts the two fields in phase. A complex impedance is the signature of a lossy medium.
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