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OpenStudy (anonymous):
A copper wire has a square cross section 2.9mm on a side. The wire is 4.3m long and carries a current of 4.0A . The density of free electrons is 8.5×1028m−3 Find the magnitude of the current density in the wire.
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OpenStudy (anonymous):
density of free electrons is 8.5 x 10^28m^-3
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