Please show work (other than Yahoo answer) Solution Vd is drift velocity i is current n is the number of charge carriers per unit volume A is the cross sectional area q is the charge of the charge carriers = 1.602 × 10–19 C A = (.0015)² = 7.07e-6 m² Vd = 1200 / 1e29*1.6e-19*7.07e-6 Vd = 1200 / 11e4 Vd = 10e-3 m/s = 10mm/s to move 10 inch (.25m or 250mm) 250 / 10mm/s = 25 sec.