A certain electrical conductor has a square cross section, 2.0mm on a side and is 12m long. The
resistance between two ends is 0.072 (a) what is the resistivity of the material? (b) If the electric
field is 0.12V/m, what is the total current? (c) If the material contains 81028 free electrons per m3
,
find the average drift velocity of the electron.
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