how do we decide that a given material is a good conductor of electricity or is an insulater
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In a conductor, electric current can flow freely, in an insulator it cannot. Metals such as copper typify conductors, while most non-metallic solids are said to be good insulators, having extremely high resistance to the flow of charge through them. ... Most atoms hold on to their electrons tightly and are insulators.
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the materials which allow electricity to pass through them are called conductors and which do not allow are called insulators
Explanation:
most metals are good conductors of electricity and materials like plastic wood etc are insulators
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