Discussion
Which field term is responsible for radiated power?
Answer: D
Only the inverse first power term gives a Poynting vector falling as the inverse square of range, so that the power through a sphere is independent of its radius, which is exactly what radiation means. The other terms carry energy outward and back again within a cycle and transport no net power. That is the cleanest way to distinguish radiation from stored energy, and it explains why the far field is defined by the dominance of a single term, whatever the antenna.
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