The Magnitude of the Poynting Vector of a Planar Electromagnetic

question 19

Multiple Choice

The magnitude of the Poynting vector of a planar electromagnetic wave has an average value of 0.939 W/m².The wave is incident upon a rectangular area,1.5 m by 2.0 m,at right angles.How much total electromagnetic energy falls on the area during 1.0 minute? (c = 3.0 × 10⁸ m/s,μ₀ = 4π × 10^-7 T ∙ m/A,ε₀ = 8.85 × 10^-12 C²/N ∙ m²)

• A)170 J
• B)210 J
• C)250 J
• D)300 J
• E)340 J

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