A wire carries a current of 0.5A, when a potential differnece of 1.5 V is applied across it. What is its conductance ? If the wire is of length 3 m and area of cross-section `5.4 mm^(2)`, calculate its conductivity.

Answer

`0.678`,`10^(5) Sm^(-1)`

Explanation

`G = (1)/(R ) = (1)/(V) = (2.0)/(3.0) = 0.67 S`
`sigma = (1)/(rho) = (l)/(RA) = (l)/((V//I)A)`
`= (Il)/(VA) = (2.0 xx 3)/(3.0 xx 5.4xx 10^(-6)) = 3.7 xx 10^(5) "Sm"^(-1)`