The Magnitude of the Poynting Vector of a Planar Electromagnetic

question 38

Multiple Choice

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 x 10⁸ m/s, μ₀ = 4π × 10^-7 T ∙ m/A, ε₀ = 8.85 × 10^-12 C²/N ∙ m²)

• A) 77.9 nT
• B) 55.1 nT
• C) 38.9 nT
• D) 108 nT
• E) 156 nT

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