# HW 13 - terry(ect328 homework 13 Turner(59130 This...

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terry (ect328) – homework 13 – Turner – (59130) 1 This print-out should have 12 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 3) 10.0 points A total charge of 20 mC passes through a cross-sectional area of a nichrome wire in 3 . 9 s. a) What is the current in the wire? Correct answer: 0 . 00512821 A. Explanation: Let : Δ Q 1 = 20 mC and Δ t 1 = 3 . 9 s . I = Δ Q Δ t = 0 . 02 C 3 . 9 s = 0 . 00512821 A . 002 (part 2 of 3) 10.0 points b) How many electrons pass through the cross-sectional area in 18.0 s? Correct answer: 5 . 76923 × 10 17 . Explanation: Let : q e = 1 . 6 × 10 - 19 C and Δ t 2 = 18 . 0 s . Δ Q = N q e N = Δ Q q e = I Δ t 2 q e = (0 . 00512821 A)(18 s) 1 . 6 × 10 - 19 C = 5 . 76923 × 10 17 . 003 (part 3 of 3) 10.0 points c) If the number of charges that pass through the cross-sectional area during the given time interval doubles, what is the resulting cur- rent? Correct answer: 0 . 0102564 A. Explanation: Let : Δ Q 2 = 2 Δ Q 1 . I = 2 Δ Q 1 Δ t 1 = 2 (0 . 02 C) 3 . 9 s = 0 . 0102564 A . 004 (part 1 of 2) 10.0 points The current in a conductor varies over time as shown in the figure. 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 Current(A) Time(s) How much charge passes through a cross section of the conductor in the time interval t = 0 s to t = 5 . 5 s? Correct answer: 18 C. Explanation: Let : Δ t = 5 . 5 s .

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