The Electromagnetic Wave of the Radiation Field from a Wire

question 44

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 magnitude of the magnetic field at point O at time t = 5.0 × 10^-17 s?

• A)1.0 × 10-8 T
• B)2.0 × 10-8 T
• C)3.0 × 10-8 T
• D)4.0 × 10-8 T
• E)5.0 × 10-8 T

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