problem32_20

problem32_20 - +-= = ))). ( 2 cos( 1 ( 2 max max kx t B E +...

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32.20: a) The electric field is in the y - -direction, and the magnetic filed is in the z + - direction, so . ˆ ˆ ) ˆ ( ˆ ˆ ˆ i k j B E S - = × - = × = That is, the Poynting vector is in the x - - direction. b) ) ( cos ) , ( ) , ( ) , ( 0 max max 0 t kx B E t x B t x E t x S ϖ μ
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Unformatted text preview: +-= = ))). ( 2 cos( 1 ( 2 max max kx t B E + +-= But over one period, the cosine function averages to zero, so we have: | . 2 | max max B E S av =...
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