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Calculate the resistivity of the materia...

Calculate the resistivity of the material of a wire 1.0 m long, 0.4 mm diameter and having a resistance of `2.0 Omega`.

Text Solution

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Here, `l=1.0m` ,
`D=0.4 mm =0.4 xx10^(-3) m, R=2.0 Omega`
`rho = (RA)/(l) = (R pi D^(2))/4l= (2.0xx(22//7)(0.4xx10^(-3))^(2))/(4xx1.0)`
`=2.51 xx10^(-7) Omega m`
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