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hw09 - Version 001 HW09 gavrin(25111 This print-out should...

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Version 001 – HW09 – gavrin – (25111) 1 This print-out should have 12 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. CurrentinTungstenWire 001 10.0points A 0 . 63 V potential difference is maintained across a 2 . 3 m length of tungsten wire that has a cross-sectional area of 0 . 28 mm 2 and the resistivity of the tungsten is 5 . 6 × 10 - 8 Ω · m. What is the current in the wire? Correct answer: A. DriftVelocityofElectrons 002 10.0points A conductor with cross-sectional area 10 cm 2 carries a current of 17 A. If the concentration of free electrons in the conductor is 9 × 10 28 electrons / m 3 , what is the drift velocity of the electrons? Correct answer: 0 . 00117895 mm / s. ElectricShock 003(part1of3)10.0points The damage caused by electric shock depends on the current flowing through the body; 1 mA can be felt and 5 mA is painful. Above 15 mA, a person loses muscle control, and 70 mA can be fatal. A person with dry skin has a resistance from one arm to the other of about 90000 Ω.
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