The Electromagnetic Wave of the Radiation Field from a Wire

question 40

Multiple Choice

The electromagnetic wave of the radiation field from a wire antenna travels toward the plane of your paper (which is in the -z direction) . At time t = 0 s, the wave strikes your paper at normal incidence. The magnetic field vector at point O in the figure points in the -y direction and has a magnitude of 4.0 × 10^-8 T. The frequency of the wave is 1.0 × 10¹⁶ Hz.
-What is the intensity of the electromagnetic wave at time t = 0 s?

• A)0.24 W/m²
• B)0.38 W/m²
• C)0.48 W/m²
• D)0.76 W/m²
• E)24 W/m²