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The resistance of an insulating material ______ as the temperature increases.

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The resistance of an insulating material ______ as the temperature increases.

(a) Increases

(b) Decreases

(c) Remains the same

(d) Becomes infinitely large

This question was posed to me in exam.

This interesting question is from Properties of Insulation topic in section Magnetic & Insulating Materials of Engineering Material & Metallurgy

1 Answer

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Right option is (b) Decreases

The explanation is: For insulating materials, the resistivity decreases as the temperature is increased. For metals, however, the resistance increases due to an increase in temperature. This is used as a key characteristic while distinguishing the two.

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