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If the diameter of a copper wire is 9.52 mm, find the resistance of a 20.00...

If the diameter of a copper wire is 9.52 mm, find the resistance of a 20.00 km length of copper wire (such wire used for power transmission).
The resistivity of the copper is 1.72 x 10^-8 Ohm meter
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Answer #1

Resistance R = ( L / A )

where is resistivity, L is length and A is cross section area

R = (1.72 10-8 20 103 ) / ( 0.25 9.529.52 10-6 ) = 4.833

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