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Why do electrons in insulators not contr...

Why do electrons in insulators not contribute to its conductivity?

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A material conducts heat because of free electrons present inside it. Since in insulators no free electrons are present, it cannot conduct heat.
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PRADEEP-PROPERTIES OF BULK MATTER-Conceptual Problems
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  15. A sphere of radius r, density,rho and specific heat s is heated to tem...

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  16. The earth constantly receives heat radiation from the sun and gets war...

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  17. Is it necessary that all black coloured objects should be considered b...

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