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Answer to Question #65469 in Electric Circuits for Helen

Question #65469
A power line carries a current of 1.25×103 A over a distance of 2.50×102 km. The line
is made of copper (Copper: Cu, atomic weight 63.5, density of 8.920 g/cm3
, assumed
to have one free electron per every copper atom) and has a diameter of 2.00 cm. How
long does it take an individual electron to travel the entire length of the power line?
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