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Insulators perform which of the following functions?

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Insulators perform which of the following functions?

(a) Conduction

(b) Convection

(c) Provide electrical insulation

(d) Allows current leakage at interfaces

The question was posed to me during an interview for a job.

I need to ask this question from Electrostatic Properties topic in chapter Electrostatic Fields of Electromagnetic Theory

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The correct option is (c) Provide electrical insulation

Easy explanation: Insulators is a non-conducting material which prevents the leakage of electric current in unwanted directions. Thus it is used to provide electrical insulation.

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