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you can say, A is a conductor (not the answer) and B is a [something] in general terms.
Got it, then A is a superconductor and B is a superinsulator, thats for sure.
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1 correct answer and 1 wrong answer :)
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I'm certain A is a superconductor, and B does behaves as a superinsulator, so what else could it be is beyond me. I'm at loss here. But really appreciate the sats, thank you :)
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superinsulators do not allow heat to flow through them along with electricity, it will be dimmer than A when heated to 1000 degrees which is contrary to the question, B appears to be a perfect emitter of heat (this is one hell of a hint)
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I can not avoid to think about coal, but you said that a material is not the answer. So I can only think about a black body, but thought that was too abstract, like saying "absorber", which wasn't the answer. Let me think...
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