p34_076 - I = 1 c E 2 rms = 1 c u avg = c 2 u avg c = cu...

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76. The energy density of an electromagnetic wave is given by u = u E + u B . From the discussion in § 34-4, u E = u B = 1 2 ε 0 E 2 ,so u =2 u E = ε 0 E 2 . Upon averaging over time this becomes u avg = ε 0 E 2 = ε 0 E 2 rms . Combining this equation with Eq. 34-26 in the textbook, we obtain
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Unformatted text preview: I = 1 c E 2 rms = 1 c u avg = c 2 u avg c = cu avg where c 2 = 1 / is used....
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