Discussion
Which electrode material extends spark plug life?
Answer: D
Platinum and iridium resist erosion and allow intervals beyond a hundred thousand kilometres. Copper cores genuinely conduct heat well and are used within the centre electrode, which makes the second option true of the core rather than the tip. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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