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stripes
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Homework Statement
Show that for plane waves, the following result holds:
[itex]\oint \textbf{S}\cdot d \ell = 0.[/itex]
Homework Equations
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The Attempt at a Solution
[itex]\oint \textbf{S}\cdot d \ell = \frac{1}{\mu_{0}}\oint (\textbf{E} \times \textbf{B})\cdot d \ell[/itex]
Now do I just use some vector identities and try and screw around with it? Or should I take a more intuitive approach? Either way I'm already lost...