PHYSICS 240 Exam 3--Winter 2001

PHYSICS 240 Exam 3--Winter 2001 - tfl Physics240 Your...

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tfl/ Physics 240 Third Exam April 5,2001 Your printed name Your Signature Instructions: Theexam is 75 minutes long. There are20 questions, check that you have all pages. You may use two 3" by 5" note cards and a calculator. No other notes or books are allowed. Laptops, PDA's, or calculators with extensive text displays are not allowed. Make sure you correctly copy your choices to the answer sheet. Make sure you put the examversion (1) andyour section on the answer sheet. Section Time Instructor Room 004 11 Rojo 224Dennison 005 12 Rojo 224 Dennison 006 1 Rojo 224Dennison 014 2 de Vries 427 WestHall 015 3 de Vries Z22WestHall 016 4 de Vries 222WestHall 018 8 Roe 216 Dennison 022 9 Roe 216 Dennison 023 10 Roe 216 Dennison 024 11 Yao 414 Dennison 025 I Yao 221 Dennison 026 12 Yao 351 Dennison Prefixes:Mmega=106,kkilo=103,mmilli=10-3,pmicro=10-6,nnano=10-e,ppico-10-1 Some physical constants: Coulomb's law constant k = 8.988 * lOe N-m2/C2 Charge on electron e = -1.6 * 10-1e C Mass of electron me = 9.11 x 10-31 kg Mass of proton mp = 1.67 * 10-27 kg Permittivity of free space so = 8.85 x 1p-12 C2ll{-m2 Permeability of free space Vo = 4n * 10-7 T-miA Speed of light in vacuum c = 3.00 * 108 m/s
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R t+, A) B) c) D) E) Physics 24}Winter 2001 Exam 3 AnRcircuithasaresistanceR=25{l,aninductanceL=5.4mH,andabatterofemf=9.0V. How much energy is stored in the inductor when a steady current is achieved? 0.35 mJ 0.97 mJ zero 0.70 mJ 0.35 J kt thiscircuit, EO= 12 V, R = 6.0 S), and L = 0.48 H. Theswitch is closed at time t =
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