Copper has 8.5 X 10^28 free electrons per cubic meter. A 68.0-cm length of 12-gauge copper wire that is 2.05 mm in diameter carries 4.95 A of current.(a) How much time does it take for an electron to travel the length of the wire?(b) Repeat part (a) for 6-gauge copper wire (diameter 4.12 mm) of the same length that carries the same current.(c) Generally speaking, how does changing the diameter of a wire that carries a given amount of current effect the drift velocity of the electrons in the wire?

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