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Quiz_9_Solutions

# Quiz_9_Solutions - Physics ZB—Section B Electricity and...

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Unformatted text preview: Physics ZB—Section B Electricity and Magnetism Prof. luan K. Schuller lIJinter 2006 TEST 9 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the questi0n. An 18 mH solenoid inductor is wound on a form 0.80 m in length and 0.10 m in diameter. A coil is tightly wound around the solenoid at its center. The coil resistance is 5.0 ohms. The mutual inductance of the coil and solenoid is 60 “H. At a given instant, the current in the solenoid is 300 mA, and is decreasing at the rate of 2.5 A/ s. 1) In this situation, the number of turns in the winding of the solenoid is Closest to: A) 1320 B) 1240 C) 1280 D) 1200 E) 1160 Figure 1 _|_——€ 60V 30H 12;) An R—L circuit has a 60 V battery, a 30 H inductor, a 12 ohm resistor, and a switch 5, in series, as shown. Initially, the switch is open, and there is no magnetic ﬂux in the inductor. At time t = 0 s, the switch is closed. 2) In Figure 1, when the resistor voltage is equal to the inductor voltage, the current in the circuit is closest to: A) 1.0 A B) 2.5 A C) 2.0 A D) 1.5 A E) 3.0 A Figure 2 x33; P 3) In Figure 2, one end of a bar is in contact with a circular rail and the other end is pivoted at P. A steady, uniform, magnetic field B is present. The bar rotates about P. The induced current through the resistor R 153 A) from b to a B) zero C) from a to b 4) An RL circuit consists of a switch, an emf source, a 4.0—kQ resistor, and a 5.0-1—1 inductor. If the emf for the circuit is 42.0 V 3.0 ms after the switch is closed, find ED. A) 32 V B) 56 V C) 46 V D) -420 V 5) A current of Ht) 2 7t“ 2 + 23, where t is time, flows through an inductor. If the self—inductance is 40 H, what is the emf across the inductor? A) -140t-1/2 - 920 V B) —186%t3/2 — 92m v C) —140t'1/2 v 13) 486%13/2 V Name Code Number Version A 6) A 3.0—A current passes through an inductor. If the inductor stores 12] of energy, what is the inductance? A) 36 H B) 54 H C) 2.67 H D) 2.8 H Solmh‘oas A3 Dawn's, fur-1,. cm: H 51.1“ch Ware-n5 9f hm; m}. If \‘OM me, ﬂwbhans o: Lommﬁﬁ'ﬁ 5M83* M, an “IMM- at airs? bx! 0&1;ch ‘naw's. Smash-m A1 (Mn 115,53 Leak; 5mm am (1wa Lai’ of Mfof‘mahw in “this mem, am] we; mu} h: Pam H’ down +0 wkw? wt can abhxaux.’ Mal.- we'ro MT Wm Vary mugk :‘n Fmah‘on cxboud- Hat. Gui-em coil) so HMS" junk U6 *9 Leak. ﬁ‘”_JW\$‘T‘ JFN, So‘ﬂmoid- Foroxwlmmai: :93: NBA ) B=ﬂo¥f ’A= T5531 L! ﬁnc‘ VN, Sac-if Induc’r-anmis W... ._ _ _ . .,.,m_m__.mm._m._.wm..m__m______ﬂ ﬁrm, Hm number 0f hum. on km s-alenos‘ek :5 Alt/100 ‘5 autistic“ A7— (53, CS, Th9 ““MH' is shown cm Wt HQ- Sinoc. Hm.» uhdudaf and ﬂu. rcsbfar arc, in Suit/5 +Nﬂr eonbmcd volﬁsf, df‘oPs Imuﬁ- Add £4919+a Hal. \JcH‘CxDL smP‘OHMj ’0‘? m ‘QA‘Hﬁfxf, “‘45 WW4“ JFKE. “duh” VOW“ “b ES (ﬁt/M] Inc M [ﬁcanCW Uglfg, .( . \ {j V ‘ _ 3: TN, VoH‘AOL m. FOSS Wm ms 2:: of U '3 a 1/, Wm Okmg Jaw) :1 y- }. 12-5/4 lZ—Q. Pk 5x15 1% Qth 6‘ S'~"]‘A"T0r\5 {BMW A3 H52, L1,qu . TM moh‘on 0? ‘HAL ha!“ is mm W: Max Emloscd 5‘1 hat air-(Mn, ho Auremc- “Thu, ’th mﬂUnch'c, flux i5 dui~m5ma. Tkus, h“. :‘ndmm cud-rem} wzn new *3 r‘cmfarw hat field y‘n’m ﬂu, pout. :...— .m...»..(m..mmw H1 ¢ Mk, W- 13»1 m rijwr Mad rme cmrm’r flow; from b is 0\. w {mambo} From HM (ﬁstmﬂon in Hwy; beak (and m (£6553 we knew Hm)" hm VoE’mae act-ass q (assurar‘ ﬁn cm [11. an“)? is IR= ER: {OWL E Ea(rl_ {Rt/L) Rm 7 Eo= if: l_e'R.C/L {w ill: H‘LV) R: H{ma-m, L‘SH, f: 3MO’35/ unify-‘15! €°=Hw A -c c- b B-b D-m Qmmn RS (:55. u, at) we're. NJ I(t\=(7\f5 +133A BVK'L L: Q3 and EM: "dig a“ I Han {Me/{5 f. .5 - \ ’0‘ ...
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