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A 260-km-long high-voltage transmission line 2.00 cm in diameter carries a steady current of 1,140 A....

A 260-km-long high-voltage transmission line 2.00 cm in diameter carries a steady current of 1,140 A. If the conductor is copper with a free charge density of 8.50 1028 electrons per cubic meter, how many years does it take one electron to travel the full length of the cable?
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