1.

Calculate the resistance of a 1 Km long copper wire of area of cross section 2 xx 10^(-2) cm^(2).The resistivity of copper is 1.623 xx 10^(-8)ohm-meter.

Answer»

Solution :`R= RHO (I)/(A)`
`=(1.623xx10^(-8)xx1000)/(2XX10^(-2)xx10^(-4)m^(2))`
`=0.81xx10Omega= 8.1 OMEGA` .


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