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A 4.00 A current runs through a 12-gauge copper wire (diameter 2.05 mm) and through a...

A 4.00 A current runs through a 12-gauge copper wire (diameter 2.05 mm) and through a light bulb. Copper has 8.5×1028 free electrons per cubic meter.

a)How many electrons pass through the light bulb each second?

b)What is the current density in the wire?

c)At what speed does a typical electron pass by any given point in the wire?

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