An 800khz radio signal is detected at a point 66 kmdistant, Ask an Expert

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An 800kHz radio signal is detected at a point 6.6 kmdistant from a transmitter tower. The electric field amplitude of the signal at that point is 780mV/m. Assume that the signal power is radiated uniformly in all directions and that the radio waves incident upon the ground are completely absorbed. What is the magnetic field amplitude of the signal at that point?

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