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img073 - 77777 q 1 l l l $177 PHYSICS DEPARTMENT PHY 2054...

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Unformatted text preview: 77777 q 1 l l l $177 PHYSICS DEPARTMENT PHY 2054 Exam 3 — SH 0113 20.6—23.3 April 4, 2006 mes. RE. 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 Scan'fion sheet (use 76—80 for the 5—dlgit number). Print and bubble in your last name, first and middle initial on‘your Scan'l'ron sheet. Similarly, print and bubble in your 8 digit UFID on your Scan’Ii-on 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 Scan’Iton 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) Blacker: the circle of your intended answer completely, using a number 2 pencil. Do not males 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 (2') Constants: “W = m- “me: new = counterclockwise 1. A current of 5.0 A passes through a 1.5 H inductor. The current is then reversed to 5.0 A in the opposite direction, and during the process, an average emf of 100 volts is induced. How much time (in ms) was required for the current—reversal? @50 (2) 75 (3) 106.1 (4) 53 (5) insufficient data 2. In the above situations, when the current is not digging, the energy stored in the inductor (in J) is; @190 (2) 4.0 (3) 2.0 (4) 38.0 (5) none of these 3. An RL circuit with resistance 1009 is connected in series to a battery with EMF 12V. If the current builds up to 1/3 of its final steady~state value in 6.0 sec, what is the inductance L in Henrys? K K N @ 1480 (2) 550 (3) 600 (4) 6.8 (5) 18 4. {mg-cw incandmoent light bulb operates from a standard 120V ac line. The maximum value of the current in the bulb m 18 6) 7.1 (2) 3.5 1-: (3) 5.0 (4) 3,000 (5) 170 5. Radio receivers are often by adjusting the capacitance of an LC circuit. If the value of the capacitance is C for a frequency of 800 kHz the a frequency of 160) kHz, the capacitance must be readjusted to @0/4 (2) 0/2 (3) 20 (4) cvfi (5) C/Ji ...
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