Discussion
Lightning induced surges on power lines arise chiefly from
Answer: D
Correct answer: electromagnetic coupling from a nearby strike
Direct strikes to a line are comparatively rare; most lightning-related surges are induced by the rapidly changing electromagnetic field of a stroke to ground nearby, which couples into the conductors and drives a travelling wave along them. Because induced surges are far more numerous than direct ones, distribution line protection is designed around them, with shield wires, arresters and good earthing.
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