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Unformatted text preview: 77777 77777 PHYSICS DEPARTMENT PHY 2054 Exam 2 SH Chs 1821 March 7, 2006 Profs. F.E. Dunnam, P. Avery Name (print): Signature: On my honor, I have neither given nor received unauthorized aid on this examination. YOUR TEST NUMBER IS THE 5-DIGIT NUMBER AT THE TOP OF EACH PAGE. DIRECTIONS (1) Bubble in your test number on your ScanTron sheet (use 7680 for the 5-digit number) . Print and bubble in your last name, first and middle initial on your ScanTron sheet. Similarly, print and bubble in your 8 digit UFID on your ScanTron sheet. (2) PRINT and SIGN your full name at the top of the question sheet. (3) At the end of the exam, turn in separately the question sheet and ScanTron sheet. (4) If there is no answer close enough to be correct, the correct answer is to leave the question blank. You should not expect many of these. (5) Blacken the circle of your intended answer completely, using a number 2 pencil . Do not make any stray marks or the answer sheet may not read properly. (6) Good luck! >>>>>>>> BEFORE YOU FINISH <<<<<<<< Make sure that your name is printed and signed on top. Hand in the ScanTron sheet separately. Note: Numerical answers may be rounded off within 1% of calculated values. Useful (?) Constants: k = 9 10 9 Nm 2 /C 2 = 4 10- 7 Tm/A elementary charge e = 1 . 6 10- 19 C electron mass = 9 . 1 10- 31 kg milli- = 10- 3 micro- = 10- 6 mega-=10 6 pico- = 10- 12 cw = clockwise ccw = counterclockwise 1. A piece of wire has resistance R at room temperature of 27 C. Its resistance doubles when the absolute temperature ( K = C + 273) is tripled. The wire materials temperature coefficient of resistivity (in ( C )- 1 ) is : (1) 0.0017 (2) 0.032 (3) 0.0011 (4) 0.019 (5) insufficient data 2. A large uncharged capacitor ( C = 0 . 01 F) and a small light bulb ( R = 10 ohm) are connected in series with a 12-volt battery. Which of the following statements best describes the bulbs probable behavior immediately after the circuit isbattery....
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