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Unformatted text preview: Platt, David Homework 10 Due: Sep 30 2005, 4:00 am Inst: Ken Shih 1 This print-out should have 11 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. The due time is Central time. 1) For 002, v is the average thermal speed of the free electron, not the average drift speed. For the same carriers the average thermal speed only depends on Temperature . 2) For 003, Think about metallic material only. Semiconductor has different story. 001 (part 1 of 1) 10 points A length of copper wire has a resistance 49 . The wire is cut into three pieces of equal length. The pieces are then connected as parallel lengths between points A and B. What resistance will this new wire of length L 3 have between points A and B? Answer in units of . 002 (part 1 of 3) 10 points Consider the application of two potential dif- ferences across the same metallic ohmic con- ductor where the conductor is maintained at a constant temperature of 300 K. V 1 J 1 L R V 2 J 2 L R Case 1: The potential difference is V 1 , the current density is J 1 , and the average thermal speed of the free electron within the conductor is v...
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