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Unformatted text preview: Version One – Homework 5 – Savrasov – 39819 – May 01, 2006 1 This printout should have 7 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. The due time is Central time. Current in Tungsten Wire 27:02, calculus, numeric, > 1 min, normal. 001 (part 1 of 1) 2 points A 0 . 9 V potential difference is maintained across a 1 . 5 m length of tungsten wire that has a crosssectional area of 0 . 6 mm 2 and the resistivity of the tungsten is 5 . 6 × 10 8 Ω · m. What is the current in the wire? Correct answer: 6 . 42857 A. Explanation: Let : V = 0 . 9 V , ‘ = 1 . 5 m , A = 0 . 6 mm 2 = 6 × 10 7 m 2 , and ρ = 5 . 6 × 10 8 Ω · m . The resistance is R = V I = ρ ‘ A , so the current is I = V A ρ ‘ = (0 . 9 V)(6 × 10 7 m 2 ) (5 . 6 × 10 8 Ω · m)(1 . 5 m) = 6 . 42857 A . Drift Speed in Copper Wire 27:02, calculus, numeric, > 1 min, normal. 002 (part 1 of 1) 2 points Calculate the average drift speed of electrons traveling through a copper wire with a cross sectional area of 5 . 261 mm 2 when carrying a...
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 Spring '10
 Dr.AndyGavrin
 Electron, Resistor, Vacuum tube, Electrical resistance

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