A Planar Electromagnetic Wave Is Propagating in the +X Direction

question 3

Multiple Choice

A planar electromagnetic wave is propagating in the +x direction. At a certain point P and at a given instant, the electric field of the wave is given by = (0.082 V/m)
. What is the Poynting vector at the point P at that instant? (c = 3.0 x 10⁸ m/s, μ₀ = 4π × 10^-7 T ∙ m/A, ε₀ = 8.85 × 10^-12 C²/N ∙ m²)

• A) 18 µW/m²
• B) -18 µW/m²
• C) 9.0 µW/m²
• D) -9.0 µW/m²
• E) -18 µW/m²

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