Discussion
Sunlight at the earth's surface has a power density of about 1 kW/m². The corresponding rms electric field is about
Answer: C
Correct answer: 614 V/m
Rearranging \( S = E^2/377 \) gives \[ E = \sqrt{377 S} = \sqrt{377\times1000} = \sqrt{377{,}000} = 614\ \mathrm{V/m}. \] Sunlight therefore carries a field of several hundred volts per metre, which is a useful figure to hold: it shows that a field strength which sounds large in circuit terms is entirely ordinary as a wave.
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