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10 Quiz 2a - ExamPHYSICB 23 SPRING 2011 SEC(A QUIZ 2...

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Unformatted text preview: ExamPHYSICB 23 SPRING 2011 SEC (A) QUIZ 2 Name_I’rofensorS.K.Sinha 5 0L UTE O 4/5 ( b9“ "“Wfi ”CD “C’J' 3"") Coulomb's constant k = 9. 10"9 N. m2] C2 (epsilon)0 = II(4nk) =8.85 . 10-12 (2/ N. m2 Magnitude of electron cl'nrge e = 1.6 . IDA-19 C M of electron = 9.1 . IDA-31 Kg 1 eV = 1.6 . 10"-19 Joules MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Figure23.1a .“ 50"76— ‘Np’ C m. we, _!.——— —__—1——— g- B VA‘ "6 + (‘9 "kIO-ém «0.5 "-3 M 3?V see—fir— ,_ «Hi __ a C Liz-S m VB'VA 'AV' ’960V 1' Q._.= ~91 nC “6 m M = «lav = (—eX—séo v) = + ebOeV A Alba, 69 :4 4.5., Pam: cam: in move #4. e’ 43m. A +. g Ignore Point C for this problem 1) Point chargesQ 1=152 nC (attheorigin) andQ 2=-9‘I nC, (ateOSm . 0.0 m) are placed asshown. In Fig. 23.13. an external force tramports an electron from pointA to pointB. The work done by the external force is closes ., B) +720 eV C) -seo eV D) -570 eV 3) 570 eV Figure 23.2b = 4%: n(‘ 3V - Q = .52u nt‘ 2) A chargeQ=-520 nC is uniformly distributed on a ring of2.4 m radius. A chargeq=1870 nC is placed at the center of the ring. (Ignore PointsA andB for this problem). In Fig. 232b, the electric potential is equal to zero ata pointon theaxisofthering.Thedistanceofthispointfromthecenterofthering isclosest to: A)2.3m B)2.2m C)2.1m D)2.5m [ t .I- O > +370n6 — 5900C V- 0 — k r If“, mama] r m (3'10 r =45fa"(9-‘(~\° V‘a.‘lm A-I Muriel (3%; sure.“ 0C— Qll «M sphere: . -,‘. (AC9 g? f,+(.72‘)+(32,3 l/x/p C 79 error] (ezuilibn‘um), [Q—J—HQJ 4R“, 2, =-é'-(4(,¢,o~‘fcs 19 i3 13 '3 32; = $00: Io'vc) 3) in Fig. 23.5. threeconductlng spheres of radii 1 meter, 2 meters, and 3 meters are connected by wires 50 meters long, as shown here. Before connecting the spheres, a charge of 4 ~10-4 coulornbs is initially placed on the large sphere. and the other spheres are uncharged). Determine the charge on the large sphere in equilibrium after the spheres are connected. glgxlwcoulomb 4/) ’fl'e. c' abs“?! have wreak its 40 rack "llv. outer she”... 34- ?! pal/:1 Win/IV I‘nwsM D)0-67x10"4coulomb “at If.” «Km o‘awr rbul. '1” pics) 9 cur energy 5’133'10'4W'0mb (“Haw—Wow) = Wow. 2+ in! (ze>..:..., =aww, 39 (lethal "‘ 759 9" ”Two conducting spherical shells are concentric, with radii of0.30 m and 1.70 m. The electric potential of the inner shell, with respect to the outer shell, is +730 V. The electric potential at a point between the shells is «80 V with respect to the outer shell. An electron is projected radially outward from this point with an initial kinetic energy orzoo eV. The electron eventually hits one of the shells. The kinetic energy of the electron as it reaches that shell is closest to: A) 1010 eV B) 250 eV C) 50.0 eV D) 450 eV E) 530 eV 5) A conducting sphere of radiusR carries an excess positive charge and is very far from any other charges. Which one of the following graphs best illustrates the potential (relative to infinity) produced by this sphere as a r notion of the distancer from the center of the sphere? 0 l'. ’1“: 7s ‘Wla “huff. :1} was discolsed derha lemme and #0 Problem- soul») but +9 / 5mm“ Sec Wile 03.8 in 4a, "éwwiggau +ep+6col¢ 4r 4-4 “Pie-«41'9”, A-Z ...
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