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Calculate the resistance of 1 km long co...

Calculate the resistance of 1 km long copper wire of radius 1 mm. (Resistivity of copper is `1.72 xx10^(-8) Omega m` ).

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Given : 1 = 1 km = 1000 m, r = 1 mm = `10^(-3) m`,
` a = pi r^2 = 3.14 xx (10^(-3)) = 3.14 xx 10^6 m^2`
Specific resistance` rho = 1.72 xx 10^(-8) Omega m`
Resistance ` R = rho (l)/( a) = ((1.72 xx 10^(-8))xx 1000 )/( 3.14 xx 10^(-6))`
`= 5.5 Omega`
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