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Distinguish between the resistivity and conductivity of a conductor.

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Resistivity Conductivity
It is the resistance of a conducts of unit length and unit area of cross section. It is the reciprocal of electrical resistivity. 
Its unit is ohm metre Its unit is mho meter -1
ρ = \(\frac{RA}{L}\) σ = \(\frac{1}{ρ}\)

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