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Q.

The resistance offered by the substance of a material having unit length and unit area of cross-section of a given material is called it's electrical [[1]].

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Detailed Solution

The resistance offered by the substance of a material having unit length and unit area of the cross-section of a given material is called its electrical resistivity.
It’s the fundamental property of a conductor. A low resistivity shows a material that freely allows electric current, meaning a good conductor of electricity. Materials with a resistivity range of

10^{- 8} Ωm

to

10^{- 6} Ωm

are considered excellent conductors. For example, silver has resistivity equal to

1.60 X 10^{- 8} Ωm

, and copper has resistivity equal to

1.62 X 10^{- 8} Ωm

. Rubber and glasses are excellent insulators.

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