Discussion
The units of the Poynting vector are
Answer: B
Correct answer: watts per square metre
\( \mathbf{S} = \mathbf{E}\times\mathbf{H} \) has units of \( \mathrm{V/m} \times \mathrm{A/m} = \mathrm{VA/m^2} = \mathrm{W/m^2} \). It is a power *density*, not a power, which is the distinction the fourth option trades on - the total power is obtained only by integrating it over a surface. Joules per cubic metre is the energy density, a separate quantity in the same theorem.
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