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(Solved): 5. A wire of diameter 1mm and conductivity 5107S/m has 1029 free electrons per cubic meter wh ...
5. A wire of diameter 1mm and conductivity 5×107S/m has 1029 free electrons per cubic meter when an electric field of 10mV/m is applied. Determine: (a) The charge density of free electrons. (e=−1.6×10−19C) (b) The current density