The Electromagnetic Wave of the Radiation Field from a Wire

question 10

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 rms value of the magnetic field? Assume that the figure shows the peak value of .

• A)1.0 × 10^-8 T
• B)1.4 × 10^-8 T
• C)2.8 × 10^-8 T
• D)4.6 × 10^-8 T
• E)5.7 × 10^-8 T