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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Quizplus · Accepted Answer

The average power is given by:P = 0.939 W/m^2The area is:A = 1.5 m * 2.0 m = 3.0 m^2The time is:t = 1.0 minute = 60 sThe total energy is:E = P * A * t = 0.939 W/m^2 * 3.0 m^2 * 60 s = 170 J

The Magnitude of the Poynting Vector of a Planar Electromagnetic