Discussion
Which construction do modern high tension leads use?
Answer: C
Resistive cores suppress radio interference, and spiral wound inductive cores do the same with lower resistance. Copper cored leads would radiate interference badly. The spiral type is genuinely used, which makes the last option a real construction. The shared behaviour explains why these belong together and the differences explain why both exist. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.
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