Electromagnetic Waves
A plane monochromatic radio wave (λ =
0.3 m) travels in vacuum along the positive x-axis, with a time-averaged
intensity I = 45 W/m2. Suppose at time t = 0,
the electric field at the origin is measured to be directed along the
positive y-axis with a magnitude equal to its maximum value.
What is Bz, the magnetic field at the origin, at
time t = 1.5 ns?
Bz = T
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