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Answer to Question #48961 in Electromagnetism for jabed

Question #48961
A copper wire has a square cross section 2.9mm on a side prob?????
A copper wire has a square cross section 2.9mm on a side. The wire is 3.8m long and carries a current of 4.0A . The density of free electrons is 8.5×1028m−3.
a) Find the magnitude of the current density in the wire.
b) Find the magnitude of the electric field in the wire.
c) How much time is required for an electron to travel the length of the wire?
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