Discussion
For that same 1 kW isotropic transmitter, the field strength at 1 km is about
Answer: B
Multiplying the power density by 377 and taking the square root gives \( \sqrt{7.96 \times 10^{-5} \times 377} = 0.173 \) V/m. There is a useful shortcut: the rms field equals the square root of thirty times the power, divided by the distance.
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