Question: A copper wire has a square cross section 2 . 8 mm on a side. The wire is 4 . 5 m long and carries

A copper wire has a square cross section 2.8 mm on a side. The wire is 4.5 m long and carries a current of 3.3 A . The density of free electrons is 8.51028m-3.
A copper wire has a square cross section 2 . 8 mm

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