exam_2_mwf - PHYS 122 ' Exam II November 4, 2011 ‘ Prof....

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Unformatted text preview: PHYS 122 ' Exam II November 4, 2011 ‘ Prof. S. M. Bhagat V Name;:Ifiiflicézgifii3‘};w 7 (Sign in ink, print in pencil) Notes i. . 1) There are four (4) problems in this exam. Please make sure that your copy has all of them. 2) Please Show your work indicating clearly what formula you used and what the symbols mean. Just writing the answer will not get you full credit. In stating vectors give both magnitude and direction. ' ‘ 3) Write your answers on the sheet provided. 4) Do not forget to write the units 5) \DO not hesitate to ask for clarification at any time during the exam. You may buy a formula at the cost of one point. ’ f t ‘41! Take Care! God Bless Yeti! Mass of proton m p = 1.6)610‘.27 kg Mass of electron V me 1: 9x10‘31 kg Elementary Charge e = 1.6x10*19 C NO CALCULATORS! Prob] a Write down Gauss’s law for E - fields. (6) ‘1 2 all It . Cfimé/Vf-E/Q 3/ \W gt @wmrsfiw (06* 4M” W Z 5' 414" 1%; i435 . um ‘ Prob 1b ‘ Given a conducting sphere, if you wish to put a charge Q on it, where will Q reside under stationary conditions? Why? (5) Um 4% gimm' 2mm?” C45 w, #424: we; lm‘le. (tab-t?) were” CE) 9: 5—K“ (jg/‘01” anva Prob 10 What is the direction of theg -, field on the surface of the sphere? Why? ‘ (5) Prob 1d Place the sphere with its center at r = 0. Show that the magnitude bfg on - the surface is 1 Where 0' = 4 Q 2 is the charge density. ii 5 {A (10) £0 7r r _E d, Wrwgep Pfob 2a Showthatthe Coulomb force (Kym/9L,” POI N T2) 1 N3. F _ QIQZ f J [$0,245 957:: ML)! 1.4: E“— ‘ { —» 471.80 r2 m is a céhservative force. (20) “ 4w mm? @“W 1323 19, Hat-«Q:- U A [Ix/mpg g; m4!— W ‘9 \ 44v; \l ~IW . Prob 2b Since F E is conservatii/e, one can define a potential energy PE and the ‘ ’ change in PE is given by APE = —FE A S Why is there a negative sign on the right side of this equation? (5) Cxtn wags!“ . ’ {lav “C PWMML tau/k appnfimr Lm i Wmhm We“. ME.) (fun Leif aim Vfi-QM fig C233” ‘ mm“: hm,“§@ lag, L La Q2 “MRVWJL‘W ‘1’? W dem wfg A la Qt) Law “We? 3 0 éwmxe it wow-at Mag, (wan, Prob 3a In the circuit shown, which capacitor has (i) the most charge, (ii) the least ' charge? Why? (1 O) 5'0 law? 5‘9"“: fzxfi/fi’sv Prob 3b _In the circuit shown, When the switch is closed, which resistor has the (i) largest current, (ii) smallest current? Why? , . r (10) Prob 3c In an RC circuit, Why does the time constant depend onlboth R and C? _ r r < 7 ~ - - <5) Prob 4a What is the difference between an E field and a g -fie1d? (5,5) \F , \ En, “an? ‘ ' a 5% fi%¢ . W%N MP fig; ‘3 4’ we o ' may Prob 4b Shown is apoil of Width b and length I suspended vertically in a 3 —field. How _ would you make it work like a motor? The coil is free to rotate about its vertioal axis”. (15) ...
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exam_2_mwf - PHYS 122 ' Exam II November 4, 2011 ‘ Prof....

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