A wire of length 2 m diameter 2 mm has 50 m ohm resistance.calculate the resistivity of the material of the wire?

Answers (1)

Resistivity

\\\rho=\frac{RA}{l}=\frac{R\pi r^2}{l}=\frac{50\times10^{-3}\times\pi\times 1^2\times 10^{-6}}{20}\\\\=2.5\times\pi \times10^{-9}=7.85\times10^{-9}\Omega\ m

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