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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://autoconfig.51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 80，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://autoconfig.51fly.win/test80.html  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。
 作者: physics    总分: 142分  得分: _____________

答题人: 游客未登录  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 avu7kk.nl6 l41+r uiw hre units 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 2hq)cuk.fk/ .q evdf; the $emf$ 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 i1h vgsy1e: 2nkn a coil produces what kind of change on the inducs:1y1h nkge2ved $emf$, 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 producegk 5n;o,: *0x .tuaj ofyek-hrs what kind of change on the induce;oe xo,ukt:- rj0ya.hn k5 g*fd $emf$, 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 looh5jcbwgt;;9 x (g0zh wp of wire produces what kind of change on the inducedxh(z5;0wjgb9tw; g hc $emf$, 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 fie/h7r s2cjqnei7 pe.n- ld an $emf$ 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, the direction of an induced current in a -k4v+8+rrzln4vjkm vw( v:dsconductor will be that which tends to produce which kv:lkv8s4 dv +rj nv+wzm4-(rof 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 dhr 7up l,x7*ion a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magpl d, *uh7rxi7net 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 flaee+7d kkyl(vjeyu5i7fpbr op(5 9z4 t (z-4ylt on a horizontal table. A bar magnet is held above its cent f(zkpel7 (pzvk+od-y79 eyb5tu(j45lr 4ye ier 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 the magnetic field vector polmdy1v9s m4yvjom6d : -dw -y6ints straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the odwm6dvy- 1yy: d6m9ml-js4 v 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 magnetic fiq:x vml9+p,n w9;id0byf9xbu eld vector 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?9p9qf:x0 dux+i mvb b,n9;ywl

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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 horiz,wp nne a2jo7pz,2( nzontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the dire,awon 2jzep2nnp(z,7 ction 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 onl-j zqi(*ugab -vb5j4n i s7d4p-jw3c a horizontal 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 from above, the induced current q lipauwnjc5 (i*d4bjsj4g v- b--7z3circles

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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 entering4bbhi /zohz/,: q*cl/e :osh l first. As /c,/*oosiqeb4 /lb :z hz: hlhthe north 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 angular speed about an ex9w2ks ez2 0h mpgp6vf*a1p1axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of th1s*xp khvge9 a wp2pm0fz126e e 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 con ye:hgxnq*6/gstant angular speed about an axis whose direction canxhg/nq 6e:y *g 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.zr;-e fwx6y*)j 6xqkx
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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 an dan9zhkx+qlf0/b2 uu g)g eg489af0 y$emf$ 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 3bhr-v nvgz21s*idl4 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 direction) is moved norgs,usmthw86v q(v,( g thward at constant velocity through a magnetic field ,,gmq ghvut6((s ws 8vthat 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 rotates at a constant angular veloci jo-m dtkc8 j)iep/00cy tg;i6ty $\omega$ 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 transformsuzqn2s3q 4rt :;:/ zkffwsa 5s

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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 sec)o t4 gzddeq up42kcs4/l1,fjond. The frequency of tj/2z1qc 4uo4pde)g 4 fls,dtk he $emf$ 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 ufa9,z s 8ms-gnsed 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 deviep2vcy3mhik d: s6+*kce that

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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 secondarx42p(7wk 1jlg)*fzew;lfyg vy coil contains more loops than the primary coil then it is a) g 4x2;lvfelj7pk*fgy(w1 wz

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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 primaxss6a7elq htv).i:c, ry coil contains more loops than the secondary coil thel x.s)i:vs7,e6 tqa chn 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 power irmzl/:iu 5 s8zj2u9o1pwd )xonput

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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 circ72kd* jc4rak 94ub qbhuit,

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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 inductorn a(b4u8o nq bos4b+h* are connected in series to an ideal battery of constant terminal voltage. Ats8q+n (naobb*4b4 uho the moment contact 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 ofpdc1b; v.,v cj ,;narn constant terminal voltage. At the moment co1n,j r bcv ,n;adp;.cvntact 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 withnn 3./5jd,mt.kbtckd inductance 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 c eaw02m0xvfnc+k+ffmn9* i j 8onnected 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 b:t;7bfb mr 5mkattery. The time constant for the circuit represeb;kb7 t5:rfm mnts 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 connu 5y2yexi.- 4h id lzm)))wqcyi ;.cdsected in series to a battery. The battery is suddenly removed from the circuit. The time constan w)ys hd yey2c.;zdc.4) luxqim-i)5it 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 havepo d (,ta1ejnl(5k4dpr3v(on the same 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 power supply. On this ci r(-s()fig;vpr o x.narcuit, 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, ga+kx1w q-ylkdh++q)the curren +gk q- dyklw+h)q1a+xt

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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 circuitfjlbb k))3 rs5 changes by what factor when the frequency is triple5) 3)rlbbsfjk d?

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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 is double*2 nlye .mlwmke l*2(cm*n.qp d, the inductive reactance of that inductemllnwmy l2q*n* *k( cm.2e.p or

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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 inductor approxyappij1t4) i4h/o/g3lfcd4 aches zero, the inductive reactance of that /jptc 4 )fx4iaghyd3p/ li1o4 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 thisag sgz75;dbw,smh7kef8 rd87 circuit, the currentw7r75dd8 ekha;g7,zf8 sms gb

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactane,3u-7,sdb7 u xx xznbce in an ac circuit changes by what factor when the frequency isbuxzn-x, 7bu7esd3 x, 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 zero, bq w:es x(5zr8d+7os i m:)acbthe capacitive reactance of that capacit(8:m)i+5rs zabqo sbexwd7: c or

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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 o vb)xnd03cytd 2) u-qif the inductor and capacitor in a RLC series c0)x ic2vdqbny)d t u-3ircuit?

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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 circuit is defined asj8 1wgll4m )px $\cos M = R/Z$, 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 increases if R incjd +m,4sazr;-nu y(ugreases. When is this statement td ;gr(nu+s,z-4ujym arue?

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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 e--gs +.inara 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 circuit. Th+ t eyw(6 bxpov4+ a72t:gtlz;-ka51xwgz g uhe 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 .ntw9jrg7xf: y:4bj3ve-y sp series circuit, the resonant x jn3e t jvsbprg:w :f-9y.7y4frequency 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 voltage. At resoocre0.y7k+jv* o n +j/ kzv;uenance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a serie9x.wmxu 3 :b9an2 hnb+w kw8tis RLC circuit 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 reh bvu m98 fq1:pj8lp6otating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the mag6p:h q 8jvfpmu9el8 1bnetic field 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 3dirv1 +gtlj: uniform magnetic field of 0.20 T. Find the magnetic flux thj lrd:t3+1gv irough 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 mcwo; x,: ep.l .v0wurj is rotating in a uniform magnetic field of 0.20 T. Find the magnej ec:pr.wu.wlxvo 0;,tic flux through the loop when the plane of the loop and the magnetic field vector are at 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 : ny 3a-vgcu) ,7qeoycan adjustable single loop is reduced from $1.0 \; m^{2}$ 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 coil7sl /n 94c-9ei apxqbyn2sr (r changes 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 fvz;gg.hko d0 w8k cco-3jdsn ;v,0 fr.rame 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 krzgwd3 -n0. ;goc0jskvvcf,o d8.;hin 8.0 s, 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 ;3h1qsyv*b3,act uec 15 turns 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 andaoo(76 e)d f (r3-nlebdd ifn3kuuf(9,foty( 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) mw b1:m;gdp(tuc jwzn7yv u1(03ffv 60 m flies horizontally at a location where the downward component of the Earth's magnetic p 0td w; 3jfn11z: fm w(cg(vb7vmy)uufield 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 t;qbl-;h uzhz*t x87a l p*u+oghat is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of itzu b;ulahoq- *8gz7thl x p*;+s 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 generato1 ;+extf* 6vas.lssg) bx ufk+r has 50 loops and 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 of area e 93agyuq(-zmq3t l9ojl7j y g69f8wz$0.090 \; m^{2}$ 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 armat9ba2r2j4 0dn: o x icv6zft;evure. 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 will0d96r 22 tejzov n ;ivcf4:xab 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 (to8 ,(6ibdaoe- yb l22fzzkyof 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 construcvcohx3-0o, fh+ j;c bst a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0cjv b+hfs3hx,- ;o0 oc.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 wqs )sal2*zv s/ pp8wgu59ax)xith 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 a resistance k*-s+ij4g0zx1.d pko3 nop:7 adnudsof 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 W. Thec9- cy3m/r ncj motor operates on 120 V ACcm-crn/yc j 93, 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 power supply+3v)hgi ,kckt . The operating current is 1.0 A. What is the start-up currentv kchtig+k 3),?

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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 ne t2+uidezrx00q,* z 3:idmj connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the bacj,qnd u ir m td30+*0z:zi2xeek $emf$ 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-(fo0j 54kscvku+wpb ;V power supply. The operating current is 1.0 A at full speed. What is the bacpkwbjskf0(+4u o5c v; k $emf$ 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 voltage o5 y3y*dno ;ew rxy-9+u lv,diaf $120 \; V$ 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 toqfbf (s5d + mkydk58;o flow in the secondary. How many turns are in the secondarykkfm5 doyb(8q ;sf 5+d?

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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 t1wrhi j1 j/z 2vm+o+zcurns are necessary in a 110-V primary if the 24-V secoc1j+zr/2 zh1wio+ vjm ndary has 100 turns?

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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 prima4dw -c0fc p3i5ynzyo-ry coil and a 2000-turn secondary coil. If the current in the seconnizccodp40ywy-5 3 f- dary 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 transfcf mc791a td( nen5y7zormer. Assuming 100% efficiency, hoc5( fa nc79mez1 7yntdw many amps at 24 V can 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 V at 10.0 mA. Thz+s * juexhq o9zz,u30e primary coil operates on 120 V. What does the primary draw?uo qsz*9 e 3+zu,xz0jh

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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 60 turns on its primary coil and 300 turns on itr g cqevc xc:;)nzbco f(d30.1s secondary coil. If 120 V at 2.0 A is f3cg10xzc ) e(cqvnbdro:c.;applied to the primary, what voltage is present in the 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 itd40hr7b p+9tdhm qp4 is cw(d(s primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is prese0h(+4dp9bc qd 7 drw(h4tpsimnt 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 transformer has 100 turns and itsdq;ymh tb72bsk* )ifdi, ,h9q secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the seconhd dim 2;q* kqht)fb,i9,by7sdary 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 turns9c,e6 glbxj,r :5ecbuj, q7hb and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect r,9 b5qc7bx:bej, ucegj h,6lthe 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 s+r)o:g z.zevc econdary has 200 turns. If the power input to the primary is 10 vze.zorc: )g+0 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 voltage is usually stepped 8w d4t+7b-lghlrwyu ; 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 prima4l+-8 b h ;ltgdywu7wrry 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 puh*q:1g+6kmq5-p mb b2c7aa.u2ht 9 ps kceb 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmissioaqbmg.u+12cbk m9 p2 6 bh 5 sqehpk*-t:up7can 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 A of current at 120 V. The voltage is usually st,nm6d7zb jc 98d1v mhfepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage pod91z7fm8nc h , jv6dmbwer 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 totalgig j wgt04(h7 resistance of 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 o4hjgtgg(7w0 if 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 0.60 W. A hqpj*. q)h70e0d wbjggenerator 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 transforj)p*hqeb h0 wjq7.0gdmer 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 x6xw0yg4,*5xr4-lvyvgw ru(l ,pjf kless power would be lost if the power were transmitted atvl*gxy,w5,44- jg kx(0ur f6wpvlxry 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 tra gc-y4cm-,nl9 7rjo linsmitted on a line with resistance of 0.60 W. To what voltage must the generator output be steppocl i--,j 4l9gnr7cymed up with a transformer 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 ev6fnn+0s .xjwr.4rd;+ +e r usxz o,yknergy is stored in the coil's magnetic fieldr;w ,nen4k xvzf.j xrr++d0o+ su6 .sy?

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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 inductor h cry1y0gqr1sqk4 2g+. What is this circuit's ti21ky0 q hr +cqyr1sgg4me 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 try v4x((rvole*5.tvk /,nt jshe rms voltage 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 i*1 b pgoo9rj:ps 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. What is the resistance v9a-q9qnztutb 8 sc+ xmh.(d .of the lax h.9v8cs(n9ba. td+qqt zu- mmp?

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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 cr9n- sukyv4v. (q. y6;sld ceionnected to a 120-V ac power supply. What is the peak current throug9.yls(q-csd.v u;ynvei kr64h the 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. What is the polk :(c t i/cj(2jlq1ucwer dissipated in th c(jtl1ci k2:j(/luc qe 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 resisto q4urs+k zv3s(r 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 5c3x zg 3w1t*tadwd-g :0-W resistor 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-Wqjdb (yu o2g;8 g46lhv resistor 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 reactance of a 1.0-mH iutw 885ksyby( s,xo ;tnductor 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 2.5.- u/lt)djvid0-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 1g:56jcym)yk v4.0-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 reacr/-ehv72rx px tance 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 12 s(axp+7ndjxm+uk 5;b0 V AC at a frequency of 20 kHz is d+x j7u5xknsma(+bp; 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 ctd*g qry sy.nu9 0*i*roil due to a 110-V, 60.0 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 o q;,* gyl-in0a dmztb*f a 4.7-mF 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 capa(bht -c, *gqbsnvgr- +citive 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 a 10-mF capaci i36egov z8opni*rt507z2zhttor 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 capacitivljo6.i0ifp zi -tq0g,-vd9lje reactance of a 0.010-mF capacitor be 100 W? qgf,-0zi9j-id 6iolj p tl.0v

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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 through a 0.0010-mF capacitor at 1000 Hz and 5.0 gqp qke cuw ue++u+6 ex11xv)z *x+u1mV?

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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 1 *lg :ys*evv ke,m8g8s2.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactancemgksegys,l v:88ev **?

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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 impedagbi5dk,av 38 ence at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are dk5b3,8avig econnected 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 a 100-W resistor, 20-mH coil,i-k /lnw1mtcy ,x,m op9h4ad* and 1.0-mF capacit,*dox,iwl9nmt 1/a y mkc-4ph or are connected 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 inductob/dh i+v;gfwa1bl,.guo w + ( ed62bear, what is the impe 6 ,gwh(; bdabueo/dwal2bf.eg++ vi1dance 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 connec z:-)xbgntivs 90pjw zs7t:3ated in series with a 20-mH inductor, what is the ph)0ng3 st7psx9tab-:j zwiz v: ase angle at 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 a8+x na vx7t3ej series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 15003enax7t8 x+jv 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 wittl8 jd6w-,on )7tgtfih a 100-W resistor and 15-mH coil to get a total impedance f76 il8o jdttt-gn ),wof 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 ey i:c3jd34uy q51qgkz1li rvr9b r;+a total impedance of 4rq95ry 3dzvj:31 eyugcb1i q4; lr k+i0000 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 ssa*i+z.(fi7 lne- wb3 ue5kus eries with a 100-kW resistor at 1.0-MHz for a total.i-w5uz3seufl*n e+ib k 7 s(a 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 series with a 20-mF.v(aq( cw7pi d capacitor. What is the impedance at 1000 H(v aw7.dc piq(z?

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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 w:zpvr hjh1 1r)ith a 10-mF capacitor at 1.0 kHz for a total impedanhpj:rh11z rv )ce 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 dziue r,ky--uh xgtd h1g;jim1 67t)36r 8 hwdin series with a 10-mF capacitor at 1.0 kHz for a phase angle of,gd)j1zmh6rhd 68ruh-tdy-3i; t gx7wki 1u e $40^{\circ}$?

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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 resistor at 1.0 kHz for a tot 3izej o0;jo5yal impedance of 45y e; ozj30oij5 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 capacitor at 120 Hz. What is the pexa geiism27: vy6;h:e/j7nl hase angxi:evhe;i7gj as/ 6 e7:n2ymlle?

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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,- q*xyf .l6o3p:s f sr5 rbyu3.n) m(tvzyrae; 20-mH coil, and 1.0-mF capacitor are connect b u5m63 nrf*3er q-fapyl; ysx tvyrzs.o().:ed 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 consist9k/ s.4(tq3oq2c * o5jg jme)xuvv gjvs of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is 5xg k2 /jm.(9v4)3o uoqvt* ejg vcsjqconnected to a 120-V, 60-Hz power supply. What is the 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 capaciboq;p h 3b:xo,v1e8gutor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series toe,;xphb 3 1 og8:vbuqo 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 res)(rd r;w ebrk fv8 q:uav4do-8istor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supproq4ewv:; a)vduf8k8 d b rr-(ly?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necess;v3dtlql )3xc ary in series with a 500-W resistor for a phase angle of3;)qxv3dtcll $40^{\circ}$ 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 =wwtj 27jwz -sjb. ,/:kv u,usajt;sp 5 10.0 mF. At what frequency should the circuit be driven in orde-zwatsu:s2 s5tjukw/,jwp 7.,bj;jv r to have maximum power transferred from 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 s2,t qa0xk3hsmb 74h-syp.ud peries circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacits2 s . 0ydtkh,bu- qhx3p7pa4mive reactance, when the circuit 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 is fr7u a o+ +uqkhej0s)lke o hwc.*7j:5$63^{\circ}$. 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 *zl ,s9lad) gzof 60 W and a resistance of 30 W. What is the dz zll) *a,sg9power 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 series RLC circuit contbwp6k5dl 2o ,faining a 50-W resistor, a 10-mF capacitor, and a 0. 2fk ow5lbdp6,45-H inductor, 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 frequusui0 7mothc0 dwz,;8q n,m )iency of a 1.0-mF capacitor and a 15-mH coil in series?d8n m)0 iu,,zo7uhqs;m iw c0t

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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 seriesbv 6yf tv73 d*,cf2zjb with a 4.7-mF capacitor for a resonant frequency of 1vbt vf*6fjy3,z27d bc0 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 f vrq6 u2dcc.y:or a resonant frequency ofq .c6u2:v rydc 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,t -i nbs.9axt9:mold resistor and a 40-mH coil if the resonant frequency of itt.l:9xabsm,9 dn o-the circuit is to be 1000 Hz?

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