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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 80 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。本试卷的直接作答链接 https://51fly.win/test80.html
 作者: physics    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 unif g(h7j/1l8 4jqybihv0 cj*n lts 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 4::xil p i)g7ual7mtythe $emf$ 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 o jsp55 hch-hq, km8)ev wq0m7yf wire in a coil produces what kind of change on the indu,h 7p0e q8h5 c5qsy-jh)kwv mmced $emf$, 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 loop of wire produnimce o o0tj .j)p2pl-wit-34ces what kind of change on the inip 20)o4-ctewtiopln -jm.3 jduced $emf$, 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 wha:c rpogdcazm 1l lztx ugdyupvl1997x412 ..)t kind of change on the inducz1plc uxzgdo)1yu tp4xc 2v7ld1a9 l.m gr .:9ed $emf$, 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 an4xjda9 l1 cco;x;d3jrja0 1sg $emf$ 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,,):nnlfg7 3v c; hnnyr the direction of an induced current in a conductor will be that which tends to produce which of the following effec;vf cg): hnn7y3,rn nlts?

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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 tablf5cm8 3qo iv1ve. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when vq voc5m3fv1i8 iewed 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 bar6 y8 rw.8xq cdmu4dzzho+2j9u magnet is held above itszuuc .d9y2zwhrx 4djoq8+ 6 8m center with its north pole pointing down, 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*rtvan zv/ ab 9y0f/i- the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from ab0bta infy/z9-r* av/vove, what is the sense 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 table top in a region where the mauq6r8x(0 *qtylqtllyyez-ijy1 72- cgnetic field vector points straight up. The magnetic field sut xq8y tq2z-1yy l0e(*l7jucyr- q li6ddenly 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 region where the 8 eiwt4/h ,gfcmagnetic field points straight down. The magnetic field disappears suddenly.g thwc /f8,i4e 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 horizontal table and carries an v+oeve)g .u3 tever-increasing current northward. Two coils of wire lie flat on the table, one to)g 3 euev.v+on either side of the wire. When viewed from 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 wb6 / x*wvcx6w)oe3dg gire with the north pole entering first. As the north pole enters the wibcx66vg* gwe d3 o)/xwre, 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 angular speed aboufaurv rz::w bq4ri/8dpc n +d0d 3(e+et an axis whose direction can bfdr/iczvu e:8 +3d (+ 4nqrb0wrap ed:e 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 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 rotated at consta5p y.d)7xmaq ppc4rw 6nt angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orien rpcdyqp7)ma.4w 5 6xptation 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.sunmt rih9nj1a-qz0du 7p w)(:) pq4y
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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 that anddeb0gs1o,)i ,do 5zc $emf$ 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 magnetic field.ih t3sixzgkex ;0 dc8s)v(77 on *f0fk 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 inh6+ r9ggnl1q)d9n6qi ug ; acn the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerniigqrnlga9n1 d hu )66+cn;gq 9ng 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 rotates at a constant an hx7sp-o: sc7 xw8xo9gkdz6f 2gular 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 trans0 eij4k4r/bg iforms

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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 revolutions each second. The fr xffw82;n nwnj hw+zdd:udl(d1.x+,requency of the ww dzd+jh2u r,+x fd:n.nd1;fln ( x8w$emf$ 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 device used tonrwk:))4 m;iz5n jh) (pfqlmm 2uhya.

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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 that5pkv 445mrxi n4y9fxg-wlj 8 i

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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 contains more loops than the primary:s(vxn:rz08:2ohcu h.po i vlk )e1md coil thk1i l.roh:( 02zd 8:o)pex: cvsmunv hen it is 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 prii *wm ehc+ cqqv7v* v4ct42:afmary coil contains more loops than the secondary coil then it 44vc*2c+mw civf:t *v ahqqe7 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 power tfo1 klp**l3 (xcj5rh 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 resonanrbzkk 3x0 6)iet circuit,

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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 in 8uxve yc2hd1g(w x9q.m 5y:crductor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery (rw2md89yxhx1. :gc cue5y vq, 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 const/1h::pk f4f0kt:cue)fg cecl +n-n1szfw a(fant terminal voltage. At the moment contact is made with the battery, the voltage 1c ffgfcweu+-: nfa/h0f1c 4:(z e)lsnkk p t: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 inductaw3 mj xhgm/9a27g o0fynce L and resistance 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 co. gv*o,wz97 mnbcf1eu nnected 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 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. T);..ui8mvyv+ckxhhf ra*:ay he time constant for the circuit repr:.c+ayh*m vx8. kvauf )r;iyhesents 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 seriesl*iidja7 0x+asa/mr 5 to a battery. The battery is suddenly remoad j+r x5mal0i s*i/7aved from the circuit. The time constant for of the circuit represents the time required for the 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 same units excepak ll:( ,gs,xnt:

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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 power supply. On this circuit, theq nke;ia dl(,7 z8di3d3fltx+lat p:. 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. f . 5ed7aexsgt/. nm5aa.ti s;In this circuit, the current se7i55/s.x. gatndemt ; af.a

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactanc67a +wdqcord 3e in an ac circuit changes by what factor when the frequency is tripledd+w6 c aoq73rd?

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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 voltag+r4t tvinp; /o jk/s;ke across an inductor is doubled, the inductive reactance of t4r+ //ktsvoip n;j;k that 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 volyc/ 4(c3 xczvrtage across an inductor approaches zero, the inductive reactanc4z (/vxry ccc3e of that 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 supplwk1o: alpve1snvwgwl6 z.6 -f1.5gjq y. In this circuit, the currens 1vwnf66al jp.-wo5:ekqw l1.zgv 1gt

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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 by whatndkgmq w9sfa cdky1.o;(9 r60 factor when the frequency .g16fd9(nr dao;csykw0k m9 q 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 caldhf7qc. cv*6nv69kj8+ixru pacitor approaches zero, the capacitive rf6x8lqi vr9 u*+jvkdnh. 6c 7ceactance 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 voltages of the in:rv 4,mz-dzrs d:e2 - srul5laductor and capacitor in a d d:- -lr4: 2zrmsle5vus,z arRLC series circuit?

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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 cnrl85no: 0k joircuit 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 cfu*6re6; wbh /wyj*rkc(s aya;k7:cmircuit increases if R increases. When is this swyk(hk s 6ycb wfu;a rjcm6*r/:e*a 7;tatement 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 circuit increases bnadj -fr:d)0a2 f5-l+w texkif $X_L$ 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 ciru5 u9:d,x,xcp gi(j p.iu6 yyvcuit. 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 capacitance both double in an LRC series circuit, to6cnc78dh wui1q00ixz kf( y7 he resonant frequ80 qxw 7o 6n(7hzdcyii0ku1cfency of that 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 circuit that is driven by an AC applied 0:g:0c ;p8h f9blvd fw;mgy5x isvki1 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 circjr9ca 2a9wwh,yvl./zuit occurs when

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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 in a uniform ml4r.o x, 4wrsfn rbx.7agnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fnlx.w ,r47s.4oxb rf rield 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 0.10et9 n)r s/beqe8f vc:4f- 1jkb m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through tbqsek je9)r ben1/vf:-c4 8f the loop when the plane of the loop and 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 magnetic fi h2oyj1gx)us0pzi i+r:i v,:qeld of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of 1qixo+j )v zi0:i hugrs:,y2p$30^{\circ}$.

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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 from .v,-( d4jduakt0 lj -zrl*sb3p1kxb o$1.0 \; m^{2}$ 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 q9u v/ ys:kx7;wvuua y63 uq*tchanges 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 wire on a square frame wit5(ar ucyf 0ck*h 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 s, find the y*furca5 ( 0ckaverage 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 turns and an aaa/c s4s ltci5y ,2e:prea 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 andxqt hsz70q0jici;e:6 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 o n/abhtv p9n py-3t24zjy77b ef 60 m flies horizontally at a location where the downward component of the Earth's magnet2pv ye7/7n hz9t 4p-a3bbjnt yic 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 a.p6v uvncb 7e3sft icj3o o-up4gxq7p9) 7b*dt a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field of gdc 7 7o-v 69*p.)bfcto sn373xujbqup4vepi$5.0 \times 10^{-5} \; T$. 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 and a eej:se:mq )x8 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 consists6oxl9k l qkx9bjcs)a;5 yt8s2 *pgei9 of 100 turns of wire 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 rectangular loops on its armature. Each loop is 12 cm lo0 1ejdzz+ a4ohng 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 will be the m d40jzh1+o ezaaximum 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 o/ xg6sx ;x5tpby g3y,nf 100 turns of wire 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 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 simpllwk8f6h68y x2akb8g* gyip7v e AC generator with an output of 12 V maximum when rotated ab7ky ap6g8f8 yx68*h gv2lwikt 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 generato+ nh(2 shyn7d54sp.oezw maa0r with a 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 k7aw1(s2k 9oa0aukb,.y eda pa resistance of 6.00 W. The motor 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 a resistance of 6.00 6d;tq98q/+a8l fuirih c/gh 3qgr u-i W. The motor operates on 120 V AC, and when grf h lcaqqiqri9du8t-8g/u6i/;+h 3 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 power supplecz7 8:e:hskk,;k+ e*2e ujjamwp :l ly. The operatingk*:ahkjlp ;jez+wes l2e 78cu:: ekm, current is 1.0 A. What is the start-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 connected to a 24-V power i9 x/7a6 xvxmm rdo80jsupply. The operating current is 1.0 A at full speed. What is thoxrm vxxj 0d7a698mi/e 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+y/ h+5 :t33iebrz fze1uh knr power supply. The operating current is 5r yzu1 nbh+i/:+e3h rzk3fet1.0 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 ne-f wpsanoe3l o8p/ 07dom 3)u2jz1mvaeded to reduce a primary voltage 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 primary of a transformer causes 14 A to flow in the secon/t y7j:dqb 3mjdary. How many t/dtj3: by 7jmqurns 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 primary if the bfg/tx 8d*-q73muuvt 24-V secondary has 100 tur7x/*gbt d f3vt umqu8-ns?

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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-turn primary coil and aqy3:tz,7vo i/ es26subwv qjw)s+4 il 2000-turn secondary coil. Ifi zj:ob 6v 3squs2e/qv7wst y,4)+liw the current in the secondary is 3.0 A, what is 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 primary of a transformer. Assu04ral9u ifvp.ming 100% efficiency, how many amps at 24 V can 9 0uplivr4af. flow in the 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 neon sign transformer provides 7500( m9z6;balfc2wlek;t V at 10.0 mA. The primary coil operab;2m 6tcwzf9eall;(k tes on 120 V. What does 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 has) 9d7ylrkf l:k 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 thel dy:k7r9)klf secondary?

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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 coivel5 j lx 4;,rs1e2hvll and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, we slhx14r l ,2vjvel5;hat current is present in the secondary?

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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 tran/j7bm 6eq( tx *feemg:(bv:pjsformer has 100 turns and its secondary has 200 turns. If the input curr mt qbembe(j6(/x ejg7vf:*: pent at the primary is 100 A, we can expect the output current 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 trans* u(5+ ;k1 bglkjnsbvwformer has 100 turns and its secondary has 200 turns. If the input voltag1 bbsl;+wj kgu5kvn(*e to the primary is 100 V, we can expect the output voltage of the secondary 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 100 turns and its secondary has 200 turns. xxy 3 mos9t5a1If the power i1o y9x3axm 5stnput to the primary is 100 W, we can expect the power output of the secondary to be (neglecting 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 voltagelot78 6bggx7 c is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the prio7 7gt68bxl gcmary 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 p-yf+2(i) by1p7y;mp ye*3abnz fwkd current at 120 V. The voltage is usually stepped up to 4500 V by a transformer y 1 bypfni; - pem7y(df3+ )2abwkp*yzand transmitted 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 60rhbc oof+ 1:s; A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmi+ :o;frob h1sctted through a power line of total 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 of 0.60 W. A genernvp8 k)-dlj;1oqcd 1ycxr- ;eator 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 energyn8rjx kp ;y1ld- qv-cd)oec 1; 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 ofc7-1zb * vwb/p ahrn(chu+ 2ro 0.60 W. A generator produces 100 V at 70 A. In ordohcwz +/pc*(rau1 nvb7-h r2ber 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 transformer 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 1000 V. How much cm9ot- 7g.plim-: wps less power would be lost if the power were tran wogip-9m.lp c: 7sm-tsmitted 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 at 20 A. It is to be transmitted on):gq-l8 qfl*-2kj xgzy.c yri a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a t2 l:.qryg gj qil8zkf*cy-x-)ransformer if the power loss in transmission is not to exceed 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 much energy is stored in thea w2p4nvoyh;.6m(6feugi qif a7ael;1z p1f2 coil's mag opleq2uypien4h afgf66v1a1;(;az2w f m7i .netic 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 1i twi/ p;(dm;j8-H inductor. What is thi/i pwd;ijmt( ;s circuit'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 voy 0yqls 8hk(ayjj.y ;4f tt0m+ltage 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 120-V AC outlet. What is the pe6 :vptek1p5pe og0oy 8ak 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. What is thyjcjd v1x+,zbn*8:c du3 x/rc e resistance of the lamprxv8d1 j */bccz:dunxyjc+, 3?

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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 ac powe6xfo1i 96, tw49hkf:w4gw2w jmzqnbsr supply. What is the peak current through the resistbg2kfwt44o h w6w , q1:w9j isfxz96mnor?

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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 co(3aizqk km3fis dt / app62*u8nnected to a 120-V ac power supply. What is the power dissipated i(8 3ps3pufmtk a/*i qa2dkzi6n the 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 50-0swzm x*jlu0/W resistor is $I = 0.80 \sin (240 t)$. 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 resjh:u e s77uv5 jgu 57nh70ak;hgwwd3uistor 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 rey:utfrwdldyz .n )574sistor is $I = 0.80 \sin (240 t)$. 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 reactanceg uy.xogl3u67bdl-: s of a 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 of a 2.50-mH coil at 10boa+ 3x yod5*t4 v;4w 4zhhtwi00 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 14.0-mH coil have 1cjp u41;ftov 8rd(jr2ip:ykht /ap 984.0 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 de k+v9hrzg/+157 W of inductive reactance at 1000 Hz?

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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 when 120 V AC at a frequency of 20 kHz4 errh,m20ruw is2rr rhewu 40,m applied 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, 60.6s zna9k6s) xd8-wdih0 Hz source?

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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-m/( jz- n;0jlu2-g w4 djauaedm76ruhxF capacitor 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 have 50 W of capacitive reactance at 10 kHasz;yjv,w9/rdbp 2;lz?

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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 a 10-mF u,4 e+jg0p3xw h s9lv.yl cyt:r53vsccapacitor 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 capacitor i )6 2wgjkav;mbe 100 Wwjgi; k am)v26?

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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 throug+y;vuxu,i oz 7h 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 with 1pjnz) v:d7gku y,,v0z 3cg8t v2.0 W resistance, 15.0 W inductive reactance, anddzvg7 up,3c,nyvkg)j80v: tz 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-mH coil, and 1zyghl .sw 1+8tyk +5jo.0-mF capacitor are connected yo+g1+kjsz.l y 5h 8wtin 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 a 100-W rajx( ddfej4/*esistor, 20-mH coil, and 1.0-mF capacitor are connected in sed*4f jdex(/ajries?

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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 resistorvg;1cyran v;) p4 lb-87 np)yr/alxmg is connected in series with a 20-mH inductor, what is the impedanc1l;pnr-) 4n8 gm pg/lxr;cyab)v 7 yave at 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 *mo,c 2 z/numh20-mH inductor, what is the phase angle at cnu,h/mzmo * 21000 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 with a 20-mH coil andlf1jd i3p95bs 1.0-mF capacitor foblf9j 1p3 d5sir a total impedance 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 a 1zr r7tsk3e2/c 8dz(iv00-W resistor and 15-mH coil to gc3 vtz 2e7zkds /r(r8iet a total impedance of 110 W at 2000 Hz?

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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 inductor at 5000 Hz for+qam n3(l6x rr a total impedance of 40000+ rr ax6mql3(n 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 resistor at 1.0d qmz4wqzh )-4-MHz for a total impedz 4 dz4-)whmqqance 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 series 0smadl :+qx.iwith a 20-mF capacitor. What is the impedancxa midl sq0+:.e at 1000 Hz?

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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 imi9 l-qpf n0t4h d,i:nn series with a 10-mF capacitor at 1.0 kHz for a total i0q :i t9- hfnd4mlip,nmpedance of 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 in dm . 2w 7c9bbg* ac ld(2b2esfw(o;gbmseries with a 10-mF capacitor at 1.0 kHz for a phasa 2cdgcmbwd eml9 2(( ; 7ob2*f.bwgbse angle 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 needed in series with a 30-W resistormlk:j da/ 7r:z at 1.0 kHz for a total imj7zar:dk l:/m pedance 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 with5mn7 km 26 uy5lo0kttb a 100-mF capacitor at 120 Hz. What is the phasen tmy5l56207um kkotb angle?

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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 cnxrna l4wdi 10bt8:5woil, and 1.0-mF capacito w0ba8l4 5n 1n:wrditxr 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 g 4/ yabymf-kp n:o,e6capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is t/ep k6, afn4moyy :-gbhe rms current in the 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 744 g4bb9-s2mq i ez1nceq;dl vm ym(bcapacitive reactance 30 W, and an inductor of inductive reactance 30 W are 4cbd b72gqizymbme-q ;nles 9(mv144 connected in series to a 110-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 containing a 50-W resistor4d lmai aea+5p65u*gj*qu ys7, a 10-a56g 7pe+a s*qj5*myua 4uildmF capacitor, and a 0.45-H inductor, when connected to 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 necessary +4 l.qpzw 2sxwin series with a 500-W resistor for a phase angle of lwpqx+4s wz .2$40^{\circ}$ 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 =o dbqwq: 00z+z 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred froz0z q d:b0o+qwm the driving 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 bs8f 4grz/d g s,,vro6g-wsa5with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the fsr4 d,g ga/z rs,ws5-6gbvo8circuit is connected to a 120-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 circuit iy sgg*/eo5d)k 1 ;jsbns $63^{\circ}$. 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 resistance of97 1wq0eck 0f:sswxllw q1a-w 30 W. What is the power fcwe1-w: fla 10k wqlw9sx07qs actor?

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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 series RLC circuit containing a 50-Wgtv sk2f976. . lywvvj resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supp7. vwgjvvf 2sk.6lyt9ly?

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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 capacixfai/ ++2 nd0-1(s 3xlje hvamgjao6xtor and a 15-mH coil in series?gif0la+ v1jn /xoeajs ax 6dh- x(m32+

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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 wiln2v:-g/gjbdov (zb4 th a 4.7-mF capacitor for a resonant frequency of 10g /vo(-d jbbz v:ln4g2 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 inductor for a resona/vd on,v*ve5* ed 6lob- vpt+ant frequenc avot*bn 5delvvv+o/dp e*,6-y of 1000 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 resistor and a 40-mwtahz,1r. xc 0a5a7n 3ee 9phiH coi7ihwcn a190pz,eath. aer 53xl if the resonant frequency of the circuit is to be 1000 Hz?

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