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How do we decide that a given material ...

How do we decide that a given material is a good conductor of electricity or is an insulator ?

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Any material can be categorised as a good conductor of electricity or an insulator based on its resistance value. Materials having very low resistance are good conductors of electricity while materials having very high resistance are insulators.
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Knowledge Check

  • The good conductor of electricity is:

    A
    graphite
    B
    diamond
    C
    phosphorus
    D
    carborundum

  • Graphite is a good conductor of electricity due to

    A
    Its giant tetrahedral polymer structure
    B
    Its high refractive index
    C
    Presence of free and mobile electrons
    D
    High IP value of carbon

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