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6_Chapter 16 HomeworkCH17 Current and Resistance

6_Chapter 16 HomeworkCH17 Current and Resistance - 74...

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74 CHAPTER 17 Problem Solutions 17.1 The charge that moves past the cross section is ( ) Q I t = , and the number of electrons is ( ) ( ) ( ) ( ) 3 20 19 80.0 10 C s 10.0 min 60.0 s 00 10 electrons 1.60 10 C I t Q n e e = = × × min 3. = = × The negatively charged electrons move in the direction opposite to the conventional current flow. 17.2 The drift speed in a conductor of cross-sectional area A and carrying current I is d v I nqA = , where n is the number of free charge carriers per unit volume and q is the charge of each of those charge carriers. In the given conductor, ( )( )( ) 5 28
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