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An 800 kHz radio signal is detected at a point 1.3 km distant from a transmitte

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An 800 kHz radio signal is detected at a point 1.3 km distant from a transmitte

An 800 kHz radio signal is detected at a point 1.3 km distant from a transmitter tower. The electric field amplitude of the signal at that point is 920 mV/m. Assume that the signal power is radiated uniformly in all directions and that radio waves incident upon the ground are completely absorbed. The magnetic field amplitude of the signal at that point, in nT, is closest to:
A) 3.1
B) 2.4
C) 1.8
D) 3.7
E) 4.3

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