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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units/d)s y69turz(ik3ul p of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that t vplcgz9e.1s x deivlv2h6kf6,ckv4,sw: + /mhe $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kin9. rtnj tzj-mk 7c5ic5d of change on the induc5j-jmzc ti5.nr7c 9t ked $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a fbw92i fn:oa 7-)rwqt loop of wire produces what kin :- 7fotiwan2)bwq fr9d of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on the ind(lxwuvmiw iae7) -++)hs 9g8 y 5qelzpucedi- xv(awue9)s ih++lme 5p 8z7lqyg w) $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field y(yi; syso( f1an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law pijfd;sk-)py :xz+s9, the direction of an induced current in a conductor will be that which tends to produi pks;jx:fsd +9-)zpyce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is hel;5y2bc0 4fa odwh9 n doeww:o96;ndtad above itsond4;d ohyw9:5o2 6e9df;w abatn c w0 center with its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar mnpg5 ,z06cegu agnet is held above its center with its north pole pointing d,uze5 cn6 g0pgown, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vector29.p;luo) z/9 y uh1nczznwwy points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the snyno2pyu.)99 l ; 1zzhzcuw /wense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level i +v3sf0x 86x4h lzkufzvzw70table top in a region where the magnetic field vectorxuzzi3 z6 +78f40sv kf hx0vlw points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a wgiin+m,z * (iregion where the magnetic field points straight down. The magnetic field disappears su+gi*i(imz wn, ddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizonta4d:feb x :px ux6x1w;ol table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed fw ::bdf4 xpu61oxexx; rom above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole e7g odzbas q4j:o(z73sntering first. As the noa7sob3(q:ogd7 jzzs 4rth pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angvng*legf5mv;*k ntj,: sm 0l .ular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must lj *0ngv;gkl,mf5n:v.mst*e be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotatv*;v oefx8q j7ed at constant angular speed about an axis whose direcx fovv7j;8 *qetion can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.j+dqpupr: m gd 6x69s mw,uj+ze.yd*8
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways thatbm 4*gzj/d5 mon+k,ymw zw* +a an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a i sr 7*djp9tw9magnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west directionzer3lll./rn 3wbjqw,7 t ng 19) is moved northward at constant velocity through a mag1b lnw9gj z3qnwrtl l,7.r/ 3enetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar g8 yj,)qo dp*roju+; protates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transformsf( av0+yeg ms2

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutiv,pi, d*-6jb kbikex425hx ml ons each second. The frequency of the e, bkk*v456,ip bmlh-j2 ix dx$emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a devici( m6 pach.h9-tmbs /xe used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device thatq-2qh ;ixlye lll*+4wu wd7f*v9o)be

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil conqvr; d)pf-3futains more loops than the primary coil then it df-u rp3f);vqis a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primarype8 usl 2t2f4/i-/notqy:gh ptrak)4 coil contains more loops than the secondary coily4t/ 2/p8 p )2rel:q-ofugti 4khtans then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the epd/.(0wah)tuv: azvpower input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant cirx00tg j( d8d-(ondlj scuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery olkh;e*x6 k 3yw. mzjivida c 3.qw/u:3f constant terminal voltage. At the moment contactqc6 k d.x3zl/j mhei3 .uw a:kiy3v;w* is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of zrlx7f93. 0bi ekai4vconstant terminal vol0v3i li .aezx7 r9b4kftage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and re d4d8n+ht2e (y1l mwfjsistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected k0m ;d8x :hjosto an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. j3- vony5b+x- uyd*+ :tfiecg The time constant for the circuit represe -yo yectijg3+ufv*-n b+:d5 xnts the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in)20hhd z7n kux series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for tzhu7 xn2 )0khdhe current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the sa( ;/8 jdnae ,npmyya0kme units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC vesu1y ukz my+m*ic5wl+g; .8power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the cuo2ic8y6wbj.9a go t t(rren962j 8 acg(bowy t.toit

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what facu mbv m4/y/2/z skpza)tor when the frequencp4ak)s 2 /vuzz/ymm /by is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor inyh.)-j q3 ozmc6u9qu wh ;2yas doubled, the inductive reactance of that2hy o 39)aqu qyujwhn-6. ;zcm inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inducyqd)0,m90lem w jg 9dctor approaches zero, the inductive reactance of tha0w ,dly9j)g9e0mdq c mt coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit,nk1wz6r j83vovr0e c;i 5h cj21pniy * the current15nz1i*e w n ori;krvc328yj0 p cj6hv

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes kiw* -h7p10lfe ghp,d1 u o-lgby what factor when the frequeog pdw 1hu-p,ie -k1f7lg*h 0lncy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zer wjiym:w6z8 4j4z01fl ibnww-o, the capacitive reactancew4lib0fwj8mz-w in6:4yzwj 1 of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the va h9;/eola3u m,zcdvl *s9zgu3f 5ta(/s (asw oltages of the inductor and capacitor in a RLC series circuw sldg93(ah3so* /(zfv c ; sl/5am uz9a,aetuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuitjml g itk-67nwo7ancxws-rgo8 +3*6i is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit ik/,1eimyhf10h 2ui,qkuht v 21q: dfencreases if R increases. When2hte1dfvf1k1,e:uh q q,h2 u m0i/kyi is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the fse/ttgq b-q9 a 00n0m+r jng3circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuiqpkpq9bx, cvj8w(q*-rvj s ls(6 0j9gt. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacrp/sw u *+h- lkqhe-m1itance both double in an LRC series circuit, the resonant frequency of ts/ r1m-e*-+quh lphkw hat circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuiu+9jme4lmx6+l.sdz rt that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs wh;5p1-h1jnsr -/ mi cy kv3ac6at*uxbpen

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating p9of*m0 z ryza6)vqu*in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fieldaz yvoq* f rmz*p09)u6 vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fielvb 51 l ;r,km+z6.gd)brvqie fd of 0.20 T. Find the magnetic flux through the loop when the plane of the loop andqbi; ) +zrmb vd6.kvrg5l,1fe the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform m laxd 3zu20+hf/0muelagnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are au+02e 3lud z/ xml0fhat an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced frb*vm.v,n c.ycom $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil ch(,zxu u pa;5cf)eveh/+ jul f(9bnnp*anges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wir76ev4 wlr7 cwm;c 6zyve on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 76m;v lywe 67vz4cwrcs, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 tung ix fg89zj30rns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns a6p1.ivy+ gxk;gqe s1qnd area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontall1c8upk* xfnzi j-ar.. h r,8why at a location where the downward component of the Eaiz-kjwfrr*.hp h.n,81x8cu a rth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constand0l6z 1zj a+obq:xez 4t angular velocity of 2.0 raz+o:d6 azlqbj e1x40z d/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops a2++ xkuq: iwsqnd a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire suk m4 szmf4m)b 4oz-*of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangulbqjqpr .)0;ss. *sn se /dxp4rar loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what ws j.0dpnxpqe/;q)*s.rsb s r4ill be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of ar2b:79zly4 dvq k.yp0qhsskzi 6-:u sqea $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator wity;m 9,igz h8kqh an output of 12 V maximum when rotat89,hgy k ;ziqmed at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with *r s 3,mnrbllt.+5lqla maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The mo;*i npe(br3sq6pij,q b)+/ja / oxg nator operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have .8nv obgz-uk1 a resistance of 6.00 W. The motor operates on 1 bz k1vgn-.8ou20 V AC, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V pol;h x qd0szjsl1d3p .5wer supply. The operating current is 1.0 A. What is the starjlh01xd pd3s.z s q;l5t-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connecte4 gxih3 wjt6rfp3k/ /p26a2 v6k kimehd to a 24-V power supply. The operating curf hpjip2ikevxk w k t36g6h/364r/2amrent is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V poweqj5*az y ;ovh-r supply. The opervzo-ha*qy ;5j ating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary volt4 y kkrxec+2(5h0 xxufage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primardvo w g:b(1)twmmded7/ *n.m ay of a transformer causes 14 A to flow in the secondary. Howd) m1oda(wmt en.w/*g:m 7dbv many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V prijcso3 p 1v,;gmmary if the 24-V secondary has 100 turn1mjcos;pg 3, vs?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turnh4kua3v v-m43q gtnf * primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what isg*f3 4tqnuh m va4v-k3 the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the prig:o:tk v bgr24yg:k7mmary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in th:o2v4 ykk: 7 gmgrbgt:e secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neooa8q yll5dh lz.j2w9a.1qn5ka 7e: cen sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What lleq.. n19 7lyqa2haekj d8ocza5w:5does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer ha:k++ ohn wr+7k2jv3fnnjj 6pzs 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondarp: h+ 3jjzovwj7r6 2knnf+n+k y?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on iu suzzu8 m;t10sbtgd((s/ iv;ts secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondm/d8u(s 1 z ubus;t(v ;zsi0gtary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has3/rni k-v rtq):w2(u 3xty4ru q3loca 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output cuan/-x:v3l)iro r4tq3q3 tkc uw(r2 yurrent at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns anq3* ;v3zte h /1szojrid its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the jzv/3qs 3o1;t*z ihe rsecondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 10 b) h.cjyz5-fod/x)ta 0 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglectingj)5) do . a/thbf-zcyx frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is uokh1 e0 o/o9jev dh;/usually stepped up to 4500 V 1 0d/;eo hh 9ou/ejkvoby a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. Tfoa4m +s4 wl3(tb jz/the voltage is usually stepped up to 4500 V by a transformer and transls(4tm4f3bw/t j oza +mitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 3m8cuk4-kof pA of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of t83c o k-upm4fkotal resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance ofnh 6 kr;q x6 n) sov7,h/buhr1cd4k7ml 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up witr;67ln7 ) v, hkhhm ckqx4dson/r6b1uh a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 8s)t m)uvh,wkrksj ydlv;(cl:.q51 g 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the tr t(hc wl)1k)d5smkuyr gl :q;,s.8vvjansformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000dt 9blk).rz 5.7 p0yk4vklf+spgm (vi V. How much less power would be lost if thplk47d rmf)l.pi k5(v.b0kgt+z s y9v e power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V a 9utkvsjnhpt*83; )yi t 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceeyi v;un9)*3p t8 tshjkd 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How muol4rj08i (v z+omn99wbzv;wv ch energy is stored in the coil's magneti v;z wz4w+ ibmo0ojv89( vrn9lc field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H indee .m.kx tx0t -w;ay+yuctor. What is this circuiy.mt0-y;w+tx.ek x ae t's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms v)qhk2i o2g w4xoltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 1fzhcsv3z9 x*220-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. y3cqb jig z7xy)01)5n,jhigq What is the resistance of the lamp ijbjq7gcygq iz 5xhy,13 0))n?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V /zxbyy ( l*0prac power supply. What is the peak current through the 0byxy(r*p/lz resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply.tp dy8lu;74sl9p , nee What is the power dissipated in thed l87sp,9lpt yuen4e; resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is zn7p 6ydi8 wf0sfuet: d,7 ylrsi-d1.$I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W reqbf8troz8 ,n: 8n7 qxf2tgwn2sistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor ssf p+a(2k :vslk.:dcis $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a bh2*:heh ((k jlwew8 +qq3ek0yg:g ma 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance 5wxn0ghmozs a s0j4u/g/zf 08of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.z1 4hzs:ub: uq0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 1000 Hz?8ib ..voafxfyd .nk*qem kd z84y2/n3

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor whe lz 5a-t6jv zaj1dml,-5 hgc-hn 120 V AC at a frequency of 20 kHz is -c5ml- lgh da1ha jz5z,6-jvtapplied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz s 77 l9r(dmicvzource?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF ca* uc(me 7h/qj- agp*:a is2mkrpacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to ha8u-9 -icgnecet s+ bt2ve 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does wp20 quek*r;kixq,/v a 10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitoy3ydo lw*oc4lq- 2 am7r be 100 W3 d2l y7*ly4qoocwam- ?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current thr *i x07lehn /r/fu1vkvough a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit wit6xusl yensd7)lu1 0ubwc*92*sqp j w-h 12.0 W resistance, 15.0 W inductive rea*ul 2 -xqsc yw1)dsjpw 7bu *u9n6esl0ctance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-me q( aw5se3dz0H coil, and 1.0-mF capacitorz 0d qs5e(ea3w are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if shyt/( g+4v1i(aqyxg a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conne14( gthys a/vi (+qgxycted in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductof j w(uq,wctym3 ,90bo8 phl*m-d0hyor, what is the impedance attw yj uhol0b,w-p8 o(*m3 dy9qhmf,c0 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, wdt:4sd/w8*ah .d; z i tt7asiohat is the phase angle a4/dst7aiad o8 zw*;:tsdi th.t 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit witkz rh)nf/ :vvlmkcr :w:()+w-il cr:bh a 20-mH coil and 1.0-mF capacitor for a total i zn rrfc(:b:k:h)i-wv+l) vml wc:rk/mpedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a0no4+g wfp,ka 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 H k0, gn+w4apofz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH.ktbxk,v th *udr*8obz54x)q inductor at 5000 Hz for a total impedance*.vkz*xx4t ,)5th8b burko dq of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW re +srig,pe,siz 4gm5mr) *w;ossistor at 1.0-MHz for a tota,+rpo *rsm z,i wgisgm4se5;)l impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in ser0c9p6 dubrcy g76o0 cties with a 20-mF capacitor. What is the impedance at 1000 c uy7 9 gcb0c6do60tprHz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for ak-x89d0ry3vd ck)xm w nb j:7c total impedance )d9 cxkwc 807rjk:- m3y xvbdnof 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed ix/+zajh.k8s ff;g *ein series with a 10-mF capacitor at 1.0 kHz for a phase angle f.j/ hgek8iz*axf;s+ of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is neeai+ kt :ttf*esv mb*:4bh2lm 8ded in series with a 30-W resistor at 1.0 kHz for a total is l*i :tmtb4m:v8fb +khe*ta 2mpedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capa1oh -ryph9xp5 )e/plj citor at 120 Hz. What is the phase anlxoj 1rep5hp y9-) p/hgle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil e,2eoiw1mjm *, and 1.0-mF o*e mijm, ew12capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, and/yo nyw,t5ig 3 a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in they/,ygoi53 nt w circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30nurq;m3( 2zu - kifv mmymle +)-k(rx. W, and an inductor of inductive reactance 30 W are connected in series to a 11(frym-q;)zr2i mu-xvk enml +mk3.u (0-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit c4:c-fyyai 1y1*dgbvfontaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected ayi*dcyyf14f g 1-: bvto a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessaryjw.* h5g7;m est2mk az-s nm;c* 4cnyr in series with a 500-W resistor for a phase angle of;mchnn t *sysa2mzmk7gcwej. 5r*;4- $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0b i+/0awblcm1qvq / k; mF. At what frequency should the circuit be driven in order to have maximum power transferred from the drivivaib; /c+/01q wmbkq lng source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resista4c2z1nhm7 ww .fncpo-qxkc64nce, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a z4c4n 1w6f7-mcnk2o pxhc.wq120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuitt* mvzw)ip99n is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a residj,; 9l2 vwd.e: e2v xcniry/astance of 30 W. What is the power /vvi, 9aee:ndxr w yd .2l2jc;factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a g k j*fw+4.*uec c9wctpu6ok s( .4rfvseries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inp4u.uc(fs*e wcg 64.oj+ 9rfkvk *ctwductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in seri twpvd6/k.rs/sgfcr 0 k)0,izes?,/sr0pc6 r tgfs/v0kz.w i)dk

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series withfuauowm;; a(3a8n 4f b ic+9mv a 4.7-mF capacitor for a resonant frequencybnwm i a4aumu9;a+ 3c8f;(ofv of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH induct8+ oomgpyj:3sa ;/gg. vdr4 baor for a resonant frequency of 100/adsmg+:r8g;o 3bvjoag4 .p y0 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W reo,mojiu j if;e6z:v .eg3.1crsistor and a 40-mH coil if the resonant f1 .mfjo;vij,z3geer.ou i c:6requency of the circuit is to be 1000 Hz?

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