Exam 2--Winter 2000 - o 240 Physics Exam Second March...

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I o" Physics 240 Second Exam March 91 2000 Your printed name Your Signature Instructions: The exam is 75 minutes long. There arc 20 questions, check that youhave all pages. You may use one 3" by 5" card of notes and a calculator. No other notes or books are allowed. Notebook PC's, 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 exam version (3) and your sectionon the answer sheet. Section Time 004 11 005 12 006 1 014 2 015 3 016 4 018 8 022 9 023 10 024 11 025 1 026 t2 Instructor Merlin Merlin Bretz Bretz Brctz Yokoyama Yokoyama Yokoyama Roe Roe Merlin Roe Coulomb's law constant Charge on electron Mass of electron Mass of proton Perririttivity of free space Permeability of free space Speed of light in vacuum Room 224 Dennison 224Dennison 224 Dennison 222WestHall 222WestHaIl 222WestHall 216 Dennison 216 Dennison 216 Dennison 414 Dennison 22l Dennison 221 Dennison k = 8.988 * 10n N-m'/C' e = -I.6 * 10-t' C me = 9.11 x 10-31 kg mp= 1.67 * 10-21 kg so = 8.85 * 16-t2 C2A.{-m2 IIo= 4n * 10-7 T-m/A c = 3.00 x 108 m/s Prefixes:Mmega=106,kkilo=103,mmilli=10-3,pmicro=10-6,nnano=10-e,ppico=lg-12 Useful constants:
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hv Physics 240Exam2 1. A battery is used to charge a series combination of two identical capacitors. ff the potential difference across the battery terminals is V and total charge Q flows through the battery during the charging process then: A) the chargeon each capacitor is Q and the potential difference across each capacitor is 2V B) the charge on each capacitor is Q and the potential difference across each capacitor is V C) the charge on each capacitor is Q and the potential difference across each capacitor is V/2 D) the charge on each capacitor is Q/2 and the potential difference across each capacitor is V E) the charge on each capacitor is Q/2 and the potential difference across each capacitor is V/2 2. Suppose one has available: two sheets of copper a sheet of mica (thickness = 0.1 mm, r = 6) a sheet of glass (thickness = 2 fi:rrr^, r = 7) a slab of paraffin (thickness = 1 cm, r= 2) To obtain the largest capacitance, place between the two copper sheets: A) a 1 mm gap of air B) the mica
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