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The magnitude of the Poynting vector of a planar electromagnetic wave has an average value of 0.724 W/m2.What is the maximum value of the magnetic field in the wave? (c = 3.0 × 108 m/s,μ0 = 4π × 10-7 T ∙ m/A,ε0 = 8.85 × 10-12 C2/N ∙ m2)
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