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Calculate the resistivity of a material ...

Calculate the resistivity of a material of a wire 10 m long. 0.4 mm in diameter and having a resistance of `2.0Omega`.

Text Solution

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Here `l=10cm, r=0.2mm=0.2xx10^(-3)m, R=2Omega " " [r=(d)/(2)]`
Resistivity, `l=(RA)/(l)=(R xx pi r^(2))/(l)=(2xx3.14xx(0.2xx10^(-3))^(2))/(10)`
`=2.513xx10^(-8)Omegam`
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