prac exam 3 - C GENERAL PHYSICS II PRACTICE EXAM II SPRING...

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Unformatted text preview: C GENERAL PHYSICS II - PRACTICE EXAM II SPRING QUARTER 2000 SOLUTIONS . R ‘”1 1. Three charges, Ql = -3.2 x 10*5 c , Q2 = 2.5 x 10*5 c , and Q3 = 5.7 x 10*5 c , are located at three corners of a rectangle as shown below. a) How much work was done to move Qt ,Qz , and Q; to these positions? b) How much work must be done on a charge q = 1.9 x 106 C to bring it in from infinity and locate it at the fourth comer? c) How much work must now be done to move charge Q from its current position to the center of the rectangle? Q ‘ ~— _— __ .. 3 r I . 1 t _ . f - 4; UNA +L1\3,\\V: Us“ l hAw ' 1 L —— a .— _ —— — — L Q . 3 * «when»: (-31% t «+9? +1 SK + “‘0 “b . l 05) ’ +§+1 -3 '—‘ ;‘Q: i 2 4333mm” + BSBKIO J ’5‘ : _ 33C) (YMJOOLEQ. ‘ if y I V: / C/ 2. A. A spherical capacitor consists of two spherical conducting shells. The inner shell has a radius of 20 cm and the outer shell has a radius of 30 cm. The region between the shells is a vacuum. V9955 What is the capacitance of this spherical capacitor? If the two shells are connected across the terminals of a 12 volt battery, how much (9 energy is stored in the capacitor? b a») ‘V~"V+ ’- ‘-"V ; "j; E '6” @ h . M , ,Q, [—J/ ’ i 97760 r‘ W60 2. V I 5’";§(12V)L : ~ «J/cv =é£éflxl 9.3mm I 2. B. Calculate the equivalent capacitance of the circuit shown below. What is the charge and voltage across the 6 pf capacitor? C11 In FdraMel wfflq fig a”: yMt+sn4=le£ g: 3n $2Y7¢5 WM " a : Ca"! V cu 'm Sexie" not?“ ‘31,: i 5’ $16 5/13 1;? dissipates thermal energy at a rate of 48.5 mW. What is the resistance of the wire? What is the resistivity of the wire? rat-K -3 ~————-—-~-—-—-a P,, : ygSX/D W : [5,03/5'JL \ (96 K= /» ,5/ _ L 2. R ' e? A Try YE "(‘wX/Ei‘) (0,&315>J7_ :— = ____2_________~______,_.. ./'/ V‘ / .30 x/o—{fl M “I g ' e circuit shown in the diagram is made using identical light bulbs and an ideal battery. The greater the current through a light bulb the greater the brightness of the bulb. For ,/ each of the following statements circle the correct answer. ‘ n 3 kV-‘l/ a) Bulb A compared to bulb B is: brighter, dimmer, V b) Bulb A compared to bulb c is: brihter, the same brightness. b c) Bulb B compared to Bulb D is: dimmer, the same brightness. Bulb B is replaced by a wire with much less resistance than a light bulb. d) Does bulb A become: brighter, stay the same brightness. c) Does bulb C become: dimmer, stay the same brightness. . 31475 ,A A 20 of capacitor is connected directly across a 12 V battery and fully charged. It is then Cot-8 r a K Vow 6) “Q a n 0 connected directly across a 100 RS) resistor. Calculate the following quantities 1 second after the capacitor was connected across the resistor: the charge across the capacitor C K the voltage across the capacitor }”‘/W the current through the resistor. m d2? 3’14" .27 Thu) ’6’ I 1 i -00, I ,3 i 23 774$ {97.57. )8; —; (zaxflf [/ama/o a)- ’ I‘MT‘“) “4”j2— c? : CV = [30A1A>[)2V> = Zia/4c, u " -y ___.._- '- ether 62847“: zvauce :zg/a’éricmj, * ' ="'/’7.3v v a q/o « 92v 9 wawxj __ a, ’ ’5‘“ ’ 22". ’ 1 = 7,3)4) / c v & I / 6 j A, ’- {0' e #95le , “x”, A Bainbridge mass spectrometer, shown below, separates ions having the same velocity. The ions, after entering through slits S1 and S2 , pass through a velocity selector composed of an electric field produced by the charged plates P and Prand a magnetic field B perpendicular to the electric field and the ion path. The ions that pass undeviated through the crossed E and B fields enter a region where a second magnetic field B’exists, and are bent into circular paths. A photographic plate registers their arrival. For ions of mass m and charge q. find in terms of E, B, q and m the speed of the ions when they hit the photographic plate . . . . . . I the radius, r, of their Circular orbit in the magnetic field B. in VelocnlL/ geleo‘ia'rél‘f‘ 13%,?” uhaavta‘reé 73.; 4523fst —o _. 7‘9 "’ q,/U'fi z z '1}! Ar: I 51 1'0“ fro}; €35 Giff/jg a v m a. be) i : qAFB! ; NW 115 ‘- / MW, = w l" " M 5/ ...
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This note was uploaded on 10/12/2009 for the course PHYS physics 2 taught by Professor Kogan during the Spring '08 term at University of Cincinnati.

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prac exam 3 - C GENERAL PHYSICS II PRACTICE EXAM II SPRING...

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