74CHAPTER 17 Problem Solutions ±²±²±17.1The charge that moves past the cross section is ( )QI t∆=∆, and the number of electrons is ( )()3201980.010C s10.0 min60.0 s0010electrons1.6010CItQnee−−∆∆==××min3.×The negatively charged electrons move in the direction opposite to the conventional current flow. 17.2The drift speed in a conductor of cross-sectional area Aand carrying current Iis dvInqA=, where nis the number of free charge carriers per unit volume and qis the charge of each of those charge carriers. In the given conductor,
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