कुछ पदार्थों की वैधुत प्रतिरोधकता का मान `Omega-m` में नीचे दिया गया है - `{:(A," "6.84x10^(-8)),(B," "1.60x10^(-8)),(C," "1.00x10^(-4)),(D," "2.50x10^(-12)),(E," "4.40x10^(-5)),(F," "2.30x10^(-17)):}` इनमें कौन -से पदार्थ तापीय युक्ति का तापन अवयव बनाने के लिए उपयुक्त हैं ?
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