what is the resistance of one of the rails of a railway track 20km long at 20C?the cross section area of rail is 25 cm and the rail is made of steel having resistivity at 20C as 6*
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l=2*10^4
A=2.5*10^-3
resistvity =6*10^-8
R=resistvity*l/A
=0.48ohma
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