PHYS TEST4 - March 16, 2011. 594 07'! OMS Name (please...

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Unformatted text preview: March 16, 2011. 594 07'! OMS Name (please print): I S i gnature : Student number: PHYS 1420 06 — Physics with Applications to Life Sciences Test 4A Answer all questions in the space provided on this test paper. Use pen to write. Formulae are provided on the last page. 1. (5 marks). An electric heater carries a current of 13.5 A when operating at a voltage of 120.0 V. a. What is the resistance of the heater and its power rating? - 4"; M F59 52 p I " (SJ-fl : 7315411 ¢fl§.rfi)(rg.aov}: 1620(4/ b. How many electrons enter (or leave) the heater in one second? fleas 12"“415 AC? % rot: ([51:34) (;,ar)-: (3.3“.1 {F-ffi {.65 (Jch; 2: £4 #(0r7é26‘cfiflwp K} : c. If the electrical energy cost $0.080/kWh, how much does it cost to use the heater for 12.0 hours? P——-— a”: f“?— f’é: {(2.9 Zea/[124:3 U: "7-49 2414 4957‘: /? a; 444)[c9,af’o£—54J; flJT, 2. (6 marks). Consider the circuit shown below. i I I 1:244) pF 1 36.0 V IQDD pF [2.00 #1“ 3—13.00 HF a. Find the equivalent capacitance of the four capacitors. “L “L” +—a[— Q 1—.— ”7 :Z‘W/«F flow/1r; 2991/: (77 1: Jigs/g F {a -; cf,chQ/1.F+ Z‘cofFff—édo/FQ f2-"—-”/»~F I ' b. What is the charge on the 4.00 14F capacitor? Qtrch 5v: fl,00}(66F)(340UJ: (445(69C c. What is the charge on the 8.00 11F capacitor? 210;? mun d".wa A1254: J’EchFS AND ‘mazE'WF Dial-'6 (hkfléc‘ A; EQUrUflCEA-if" (#Pfl‘crmfl o7!“— flaw/4F 62,5 finance-6F) {'5an : 2-re~u6“r. 3. (8 marks). Answer the following four multiple-choice questions. a. Compare the brightness of the four identical light bulbs connected as shown below. Which light bulb(s) glow most brightly? C 3. D 4_. C and D (glow equally brightly) 5. All are equally bright @A and B (glow equally brightly) b. The capacitor in the figure below is initially uncharged. When the switch is closed at t = O 5, what is the voltage drop across the capacitor after one time constant has elapsed? 6.00V - 1.2.05 V '73TE63 v Mi? "" " 4. .79V V‘Vofl‘f ) 5.4.43V V¥éoovj (I “539:: 3.??V ' 2.0017 5.009 c. Two long parallel wires cross carry the same current I, as shown below. The direction of the magnetic field due to both wires at point P is '1‘. —-> 2. l 1 3. T a 4. <— -P - , 6. out of the page. 7. the magnetic field is equal to zero (1. A horizontal power line of length 58 111 carries a current I = 2200 A. Earth’s magnetic field at this location has magnitude'of 5.0)(10'S T and makes an angle of 650 with the power line, as shown below. The direction and the magnitude of the magnetic force acting on the power line are l. ->, 5.8 N 2. into the page, 2.7 N 3. T, 58 N 4. out of the page, 0.27 N @into the page, 5.8 N 6. out ofthc page, 5.8 N 7. into the page, 2.7 N fififé/ZS‘IAQ— .. 4. (6 marks). A laboratory electromagnet produces a magnetic field of magnitude 1.50T. An electron (charge e = 1.6Ox10‘19 C, mass m = 9.11x10'3i kg) moves in this field in a circle, as shown below, with speed v = 1.3x107 m/s. a. The direction of the magnetic field is: 5 'nto the page 6. out of the page. b. Determine the magnetic force acting on the electron when it moves in the magnetic field. 1:: 70735.1«5 7 (Céxro‘mc)(43 no? “'11) ( {I‘dsfq f0” F :- 3./w5'2N- ‘1 c. How much. time does the electron require to make one revolution? '-.. a a n .14.. t)‘ a M ’14: 4a r .- »—— __ .2???“ led“ . W 7 =3 a; 12-97. 3 as: gm 6 &: 2/{5 (gzléz 1 __ 2 (1 9-H ; {/Léflo'41f/(y-ra‘r}, ' Flo 5‘ (1. Does the magnetic field affect the speed of the electron? Please explain. Nd Tire? AIMW REL! rr Peep pawn «2:44 72.: I oripmcfhé'pr 4m: 0063’: Z523 mien: mot; We? [fIIUi—FT’C Eufgél P 14:10 (3&7; aw MM is": fficirflwu no HT _ 12v 5. (6 marks). Consider the DC circuit shown below. a. Knowing that 11 = 3.5 A, find currents 12 and 13. b. What is the potential difference across the 4.0 Q resistor? 4‘ 400? Sauce-Tc up. 29 #1201"; -_<r,.:>_(; -— 3.013: (:3 .29 —€0I;3v*-’f3 Cc; 1:1 stoma?) m Slur—5': u I; £04 F. .— 12 1: ,7;'-_J:g':_ 3_J'fl- — flvzfl: 2.174 ‘ 1) AU =(2{.r-9_‘§?)(3.J‘4)';. [1/ a .4 C:—‘\‘/ Cc: 1“: _(.. - a = ’ ‘ A A d. J%?C‘)%fi2q25=f@4‘/ :62(/‘ ‘t/kc -—~é/£c i ) ZZQE T‘EC— / .. £1.92 - 4" I? m:— > Ifihfi’qdi [‘22— E J 2:535: r $2‘I4V/ : fl ._ .22- x41” E 22rd" ’B’Nfia 2 8’ I 56. m.) wish” ' M flu—a 5: fwd?» J 5:5“8-“8, {zine If= r48 “‘6’ 2 #- v-fi F—ma ca- 1,» e: flax/8’ c' f : K £52 "1 r a {ffKDA/WL/ /(.=:‘?(77¢/¢9 g9 ...
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PHYS TEST4 - March 16, 2011. 594 07'! OMS Name (please...

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