Electrical conductivity of insulators is

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(C) Insulators are materials that do not allow the flow of electric current through them easily. This is because they have a very large energy band ga

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extremely small

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(C) Insulators are materials that do not allow the flow of electric current through them easily. This is because they have a very large energy band gap between the valence band and the conduction band, which prevents electrons from moving to the conduction band. Consequently, their electrical conductivity is extremely small, typically in the range of $10^{-20}$ to $10^{-10} \ S/m$.

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