Question

how do we decide that a given material is good counductor of electricity or is an insulator

Answer 1

if any object passes current through it then it is conductor and which do not passes current is insulator

Answer 2

by passing current through the material we can understand that the material is a good conductor of electricity or is an insulator. is it passes current then it is a good conductor and if not then is an insulator.
hope it helps you
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