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Characteristics of a Good Conductor or Insulator

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What property makes a given material a good conductor? What property makes a given material a good insulator?

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Conductivity is the measure of the ability of a material to transfer electric charges from one point to another under the influence of an external electric field. Insulating is just the opposite, that is, the property by which the electron flow is limited or impeded.
<br>In a good conductor, there must be free electrons available to ...