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A small but measurable current of 7.8 x 10 10 A exists in a copper wire whose diameter is 2.0 mm. The number of charge carriers per unit volume is 8.49 x 1020 m Assuming the current is uniform, calculate the (a) current density and (b) electron drift speed. (a) Number i 2 4828E-16 Units A/m*2 (b) Number 1.7E-14 Units my/s