Question

A small but measurable current of 5.6 x 10-10 A exists in a copper wire whose diameter is 3.4 mm. The number of charge carriers per unit volume is 8.49 x 1028 m-3. Assuming the current is uniform, calculate the (a) current density and (b) electron drift speed.

Answer 1

---------------- Solution of part a ------------------

Current density is given by

Current Density is 6.168*10^{-5} A/m2

----------------------------------------- Solution of part b ---------------------------

Electron drift speed is given by

So electron drift dpeed is 4.5*10^{-15} m/s