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Unformatted text preview: 12/17/10 9:20 PM Ch19 HW3 F2010 Page 1 of 4 http://www.webassign.net/v4cgisacoreth@ncsu/student.pl?g=20101218022008sacoreth@ncsu6657124101 Current Score : 12 / 12 Due : Monday, October 11, 2010 11:25 AM EDT 1. 2/2 points Question: MI3 19.9.X.056 Why does the brightness of a bulb not change noticeably when you use longer copper wires to connect it to the battery? 2. 5/5 points Question: MI3 19.9.X.072 A Nichrome wire 99 cm long and 0.25 mm in diameter is connected to a 1.4 volt flashlight battery. What is the electric field inside the wire? 1.414 1.41 V/m The Nichrome wire is replaced by a wire of the same length and diameter, and same mobile electron density but with electron mobility 4 times as large as that of Nichrome. Now what is the electric field inside the wire? 1.414 1.41 V/m The electron current in the first circuit (Nichrome) is i 1 . The electron current in the second circuit (wire with higher mobility) is i 2 . Which of the following statements is true?...
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