Discussion
Consider the following statements about the Poynting vector.
1. Its units are watts per square metre 2. It is the cross product of the two field intensities 3. Its imaginary part carries net power
Answer: D
Correct answer: 1 and 2 only are correct
Statements 1 and 2 are correct: the units are watts per square metre, and the vector is \( \mathbf{E}\times\mathbf{H} \). Statement 3 has the two parts the wrong way round - the real part carries the net power and the imaginary part represents energy oscillating back and forth without net transfer.
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