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Attempt:

I think I've done the first bit correctly (but I'm not certain). As for the second half of the question i'm at a loss. I have looked up poyntings vector and found S=ExH where H is the auxiliary magnetic field (i'm not sure what this means) and S=(1/u(0)) (ExB), but i'm not sure what to do with it.

Any help appreciated.

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# Homework Help: Poynting's vector problem

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