2- A copper wire of 3mm diameter with conductivity of 6.7 10′ (0.M), and electron mobility of 0.0064 m2 /V

2- A copper wire of 3mm diameter with conductivity of 6.7 10′ (0.M), and electron mobility of 0.0064 m2 /V sec. Is subjected to an electric field of 30 mV/m. Find (a) the charge density of free electrons, (b) the current density, (c) current flowing in the wire, (d) the electron draft velocity.


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