121homework 6 - Felder Jacob Homework 7 Due 9:00 pm Inst...

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Felder, Jacob – Homework 7 – Due: Oct 24 2006, 9:00 pm – Inst: Vitaly 1 This print-out should have 9 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. 001 (part 1 of 2) 10 points The potential difference in a simple circuit is 20 V and the resistance is 17 Ω. What current I flows in the circuit? Correct answer: 1 . 17647 A. Explanation: Let : V = 20 V and R = 17 Ω . The current is I = V R = 20 V 17 Ω = 1 . 17647 A . 002 (part 2 of 2) 10 points How many electrons pass a given point in the circuit in 14 min? Correct answer: 6 . 17647 × 10 21 . Explanation: Let : I = 1 . 17647 A , t = 14 min = 840 s , and q e = 1 . 6 × 10 - 19 C . I = q t , where q is in coulombs and t in seconds; that is, q = I t, and the total charge for n electrons is q = n q e , so n = q q e = I t q e = (1 . 17647 A) (840 s) 1 . 6 × 10 - 19 C = 6 . 17647 × 10 21 . keywords: 003 (part 1 of 1) 10 points Birds resting on high-voltage power lines are a common sight. The copper wire on which a bird stands is 2 . 31 cm in diameter and carries a current of 119 A. Copper’s resistivity is 1 . 68 × 10 - 8 Ω m . If the bird’s feet are 3 . 88 cm apart, what is the potential difference across its body? Correct answer: 185 . 086 μ V. Explanation: Let : r = 1 . 155 cm = 0 . 01155 m , I = 119 A , L = 3 . 88 cm = 0 . 0388 m , and ρ = 1 . 68 × 10 - 8 Ω m .
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