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For this problem, I know the answer is B but I do not know how to get there. Seeing the steps and equations would be much appreciated. Thank you

The magnetic field of a plane-polarized electromagnetic wave moving in the z-direction is given by B = 1.2 x 10° sin 2x
240
tx 10'
in SI units. Find the average power per square meter carried
by the EM wave.
a.
720 W
b. 172 W
c. 500 W
d. 2 x 107 W
e.
86 W

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