A Planar Electromagnetic Wave Is Propagating in the +X Direction

question 46

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 × 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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