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Unformatted text preview: t?+ Your printed name Phvsics 240 Third Exam April 6,2000 Room 224 Dennison 224Dennison 224Dennison 222WestHall 222WestHall 222WestHall 216 Dennison 216 Dennison 216 Dennison 414 Dennison 221 Dennison 221 Dennison 103, m milli = 10-t, pmicro = 10-6, n nano = 10-e, ppico = lg-12 Your Signature Instructions: The exam is 75 minutes long. There are 20 questions, check that you have 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 (l) andyour section on the answer sheet. Section 004 005 006 014 0 1 5 0 1 6 0 1 8 022 023 024 025 026 Time 1 1 1 2 I 2 a J 4 8 9 1 0 1 1 1 7 2 Instructor Merlin Merlin Brctz Bretz Bretz Yokoyama Yokoyama Yokoyama Roe Roe Merlin Roe Prefixes: M mega = 106, k kilo = Useful constants: Coulomb's law constant Charge on electron Mass of electron Mass of proton Permittivity of free space Permeability of free space Speed of light in vacuum k = 8.g8g * 10e N-m2/c2 e = -1.6 * 10-" C me = 9.11 * 10-31 kg mp = 1.67 * 10-27 kg o = 8.85 x 19-12 c2lNl-m2 Ih= 4nx 10-7 T-m/A c = 3.00 * 108 m/s t?5 Physics 240Exam3 1. A rod with resistance R lies across frictionless conducting rails in a uniform magnetic field B, as shown. Assume the rails have negligible resistance. The force that must be applied by a person to pull the rod to the right at constant speed v is: BLv BLv/R B2IlvlR B2Lxv/R 2. An inductance L, resistance R, and ideal battery of emf E are wired in series. A switch in the circuit is closed at time 0, at which time the current is 0. At any later time t the emf of the inductor is given by: E(l - e-rt.,n; Ee-Lt/R E(l + e-Rr/L) Ee-RTIL E(l - e-ntn; Magnetic dipole X is fixed and dipole Y free to move. Dipole Y will initially: move toward X but not rotate move away from X but not rotate...
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