Exam 3 2005 Solutions

Exam 3 2005 - PH 132 Exam 3 Student Name 5 GK L 770 M S M Student Number Labeeeitatinn Seetinn Number(1 I,i,3 5 Instruetinns 1 Fill nut all the

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Unformatted text preview: PH 132 Exam 3 Student Name 5 GK. L) 770 M S M Student Number Labeeeitatinn Seetinn Number (1 I ,i . .,3 5) Instruetinns: 1.. Fill nut all the inferrnatien abeue. Write yeur nanie en'eaeh page. 2. Clearly indieate year final answers fer all multiple-eheiee questiens in the spaee presided. 3. Present neat and erderly selutinns tn eaeh prebleni. Clearly indieate yeur methed ef selutinn by ineluding equatinns used fer eaeh part. Final answers sheuld be eireisd er bested. 4. Be sure tn inelutle apprepriate units with all answers. CE 5. P ‘a‘ * ff : a =3i35s10‘” . ernn wrty n ree space 9 N I in? . . _5 T- n1 Permeability nf free spaee: pa = 1.26 s: 10 7 Multiple Cliniee Prebleni l Prnblent 2 Tntal Multiflle Chniee (2 pts. each) I) The fullnwing square, reetangular, and trian gniar Ienps nf wire carry the eurrents I, 21, and 31, as shewn, Assume a unifenn magnetie field is direeted to t he i; hr fer eaeh, Rank eaeh inep aeenrding tn the magnitude ef the net terqne aeting en eaehfirsr. s E E. “'—_'* _____,, ,_____, i 31 21 +—~——-——...._.___,________'_r 2:? W 6’ E, a) t: E. 1:.) C) A a, b, C"; M 1 D F 2 B)? b e a* (in. = C£)(£:)B¢:fi?fl :2 J—IQ E3 5 5 j n. -— t C) c, b, a; ’31,, = (2:)(213 +§_-)3g.fle :- 2.1.,Q 6 n 11 th ; . .. a A B )a are esanie fiL;CEI>(?fl‘1)BM?O=;I£zB nswer 2) A wire earries a enrrent I frern paint a te paint b in a nnifenn magnetie field, as shewn. The net fnree aeting en this wire is: ,, X R X A) ZIRB upward; fl— - B) 21133 dnwnward; C) 41KB upward; "" _ J"..- A D) 41KB dnwnward. I: " 1' #5 Answer C— El 1 Wm]? I ,/ 3) The figure belcw shcws the path cf a pastes that nnifcrm magnetic fields cf magnitudes BI and B3 Which cf the felicwing is true if r2 = 2r1 ? A) E] is directed fare the page; 1-32 is directed mm the page; E) E1 is directed mm the page; E2 is directed car cf the page; C) E] is directed eat cf the page; E2 is directed mm the page; D) E is directed ear cfthe page; E: is directed car cf the page. 4) Ccnsider the figure in the previcus questicn. Which cf the fcllcwing magnetic field strengths and the time spent in each magnetic regicn? E) BI =Bgf2 and TI :51}; F) B1 2322’?! and Ti {T}. passes thrcugh twc regicns ccntaining . Its path in each regicn is a semicircle. Answer A -—-r——..___ is true regarding the -—-—-..-\.. .-. . _-._- _ 6) Censider three long, straight, parallel, equally spaeed wires with identical eurreats either inte er eat ef the page. Rank the wires aeeerdiag te the magnitude ef the aerfaree ea eaeh due is the currents in the ether hare wires, greatest first. A) a, b, e; 5 B) b, a, e; C) e, a, b; D) all are the same. 3) Cauaider the fellewiag figure: ahawia the Bier-Saver: law may be applied ta raiatalqenl}r drawn? A) The direetien af it; B) The direetien at F; C) The direetien af a’fi; D) neae. Answer B 9) A rectangular eenduetiag leap mares at a eanatant apeed taward a leng straight eurrent earrying wire. As a result afthia aetiea: I we Lama??? LAW- —j. V I iii 1: I A) the indueed eurreat in the leap ia elaekwiaa; B) the indueed eurreat in the leap ia eaaararee'aakwr'aa; C) the inclueed eurrent in the leap eaeillatea baek and ferth; D) there is ne indueed eurreat in the leap. Answer A u'tl'l—I—I—I—I. .I.'\. I 'lv ..:__ -.-\.-u:._._._-\_; .-_ 10) The time ccnstant in a charging RC circuit represents the time it takes far A) the current threugh the resister to decrease tn 63% cf its initial value and the charge an the capacitcr tn increase tc 63% cf its maximum value; B) the current thrcugh the resistcr te decrease tn 3?% at its initial value and the charge an the capacitcr tn increase tn 63% at its maximum value; C) the current threugh the resister to decrease tn F—f’; 37 : C537"; LcfiCD’ > IR} in: Prcblern 1 A lcng ccaxial cable ccnsists cf twc current carrying ccndnctcrs as shcwn. The ccndnctcrs carry agate! currents. in the same directicn (unifcrrnly distributed thrcugh the cress-secticn cf each ccnductcr). Use at = 1 m, b 2 J5 In, c = 2 In tc simplify ycur final answers a) Find an enpressicn fer the magnitude cfthe magnetic field B in the rcgicns can and rr-fire‘b. (Spurs) _-. b) Find an enpressicn fer the magnitude cf the magnetic field B in the rcgicns birdie and The. (Erna) c) Ccrnplete the graph by ccnnecting the paints given with a sketch cf the apprcpriate scaling in each cf thefcrrr regiens. (4 pts.) BONUS: At what twe radial distances frcni the center pcint cf the cahie (r = D) is the magnetic Preblem 2 Twe straight eendueting rails spread eutward angles with the heriabntal. A light bulb with resistanee R banneets the elesest ends ef the rails. A eendueti ng bar starts at the light bulb {a = 0) at I = 0 s and slides aleng the rails in the nesitive s—direetien with a een the page and eriented perpendicular tn the pl a) Find an eapressien fer the area ef the eireuit as a fuaetiea bf time. (4 pts) b) Find eapressiuns fer the magnetleflax and the magnitude ef the induced emf as funetiens at time. (3 pts.) e) Sketeh a plat ef the magnitude ef the indueed emf as a funetien bf ' magnitude ef the emf at r = 0 s . (3 pts.) {1) Assume the resistanee efthe light bulb is 4.0 Q . B =10.0 111T, l: 2.0 m, and V n 0.50 mls. The light bulb will turn an 1when the eurrent reaehes a value ef40.0 mA. At what time will the bulb light up? {3 pts.) e) Indieate whether the eurrent is .u eeuatereleehvfse. (2 pts.) SOUS: On a sear-ate rah sketch the nwer dissiated b the li ht bulb as a funetinn eftime. (3 ts. ...
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This note was uploaded on 09/03/2009 for the course PH 131 taught by Professor Wick during the Spring '08 term at Clarkson University .

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Exam 3 2005 - PH 132 Exam 3 Student Name 5 GK L 770 M S M Student Number Labeeeitatinn Seetinn Number(1 I,i,3 5 Instruetinns 1 Fill nut all the

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