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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 are kjbp*v ys4x+8ki pk;8units 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 inductio6bi1 brtal7l ,n states that 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 in a coi7r +uzyx7:mli 9di5 fol produces what kind of change on the induced x 9z+i57fydolui:mr7 $emf$, 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 4qqhhkt:- .zffrqz:s9i:.-yul 0djq through a loop of wire produces what kind of change on the inqqd9 i:h0z.r t q-f kyq-j lz4:fus.h:duced $emf$, 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 o s3g 1t9g4kuv li+,e 3k*cputpf a loop of wire produces what kind of change on the induced iet*p9 ,u 3c g+4 pkvkt1su3lg$emf$, 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 magnet2z ivb(sp 7rp.ic field 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 w9*wj(g8 yj(f y +03zjeeznq/4my ejc an induced current in a conductor will be that which tends to pr+ zj8yje( 9cq 3mn *4jwge/zf0yew(yjoduce 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 held abo j4x-qc13e8hj:m,h ea6b uv)qgh; jiq ve its center with its north pole pointing down. The stationary magnet induces (when viewed fro hjj38aeqju)v ,x;:e -bi6 qcg mh41qhm 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 horh +vi ih0i/e.uizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it 0/ih i+.eivhu 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 a5suj 50c oczs 5o6pi k5cr3g0j table top in a region where the magnetic field vector points straight up. The magnetic field vanishes sud ozc5jupoj k35r i0cs6 s5g5c0denly. When viewed from above, 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 swd6-jp( ts6nfh, sf3magnetic field 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 incrhd jfs,-tws6 3f snp6(eases?

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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 v,9qr) ge9pv be*jq7dhorizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in tvqbe g q9),dejv9 7rp*his 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 es, 9rha*zx1o63xb3 lc icp,i zver-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induce ,iips3 z6xzl,o9xhc3c*br1 ad 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 cnt:7yccp :9 -6 v1nr:gjwkufs1qpi2wire with the north pole entering first. A:ukqns cgp2j 7c 9fnr- p116ctviw: y:s the 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 ax9 94buu:ntyrjbh z 4e+is whose direction can yh94eru t ub+z 49n:jbbe 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 a nq;hc m.pa0sra d/h28t constant 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 orientation of the ;dp /8scq. ram20hnahloop's axis of rotation if the induced $emf$ is to be a maximum?

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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.zy r vqs4e5wp )c99) br7)fphr
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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 th)up/z sy ,u/u+v1nt5 nuzjfu 7at 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 magnetic field. Thf(bsela7 .h t7e $emf$ 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) ktu0j. ars6n5 is moved northward at constant velocity through a magnetic field that points straight trau6jks.50 n 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 ata.ur,68e ncft tk6;l jyazo)( 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 :u)wzj ce jthfn- .-x/transforms

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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 sn)myf)1p . g 7tjf uzd.64,gtx:wn;tu(m jcdgecond. The frequency of the (g)n.4jf ndmgugtxuwpm, c t .1z;:6 ytf 7j)d$emf$ 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 devicib7izyfu c11ob.:80dcvl z .qe 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 thaim.x j7ik8 lwf2,s x(at

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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 containlh -hsin2 qz0ax w+( xg03hg9ps more loops than the primary coili+h3hsxng 0w(xplqh0 9 ag2z- then 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,oqqu4h ,3 oqrgfxwf1( luin )94nc0 r primary coil contains more loops than the secondary coil then urf( 1n4) irwfh g0l,u cxo3qqq4no 9,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 pwnv 9q+d. cwf54xhps+bed)a5 ower 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 circuit,u()oxg6c 6k kc

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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 conydx c ;+kkxq:iec87 b im7g0,gnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage eicqg07c:+k xx8b,gi;dm k y7across 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 c-+n+k6ap)krlfh uq).a7mcz dy0xt5c onnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acrossrk 5z p)+um)7kn0hydc .ac -aqxtl+6f 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 resistance R ioa pj)m(h1fzm vt 2/,vs 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 twe j7s.uzpm385 -up rto 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 se*d3 yo+xc3jnb qo3enee* k;c/ries to a battery. The time constant for the circuit represents the time required foo o* cxnnye dec+3e3k /3*q;bjr 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 series to a6c()ivv di 2ej/xon8 xsg3/js battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required 36gsox v j8/csidv j( e/)2nixfor 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 excepytmmvndy7y s0ar*p q(gm1(9 v3o9f. pt:

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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 togtgc/x5 fy0m, an AC power 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 powe ai1ae 9lz7khhu0u g2+i5i2hfr supply. In this circuit, the currentf igule5i22z 1hai+huk90 7 ah

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactanczpe x 7qr5(a8 -iiaq9nij-7jq e in an ac circuit changes by what factor when the frequency is triplea7j7pi5ax e8 (q-jqrzi- 9qi nd?

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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 doubled, the induc gdr8na9r8pe4p4 )fr qtive reactance of 4g8rfqe pp)9 d8rr4anthat 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 inductor approaches zero, the induc.t(ofd5(c236 n bnrm-cxfv vctive reactance of that co3ccfb.tno6dv - f2(rv( cmn5x il

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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 thisu *e4 r/ t1zaf2yk(ynqdmw*3 e circuit, the currentfu1w4ne y eyk m3d*qatz*r/2 (

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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 ca 3qhaa 0z32.i 5ekximhanges by what factor when the frequence3xa h2aiiazk.q 35m0y 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 th ks -ed-c3t)eul /,qhie AC voltage across a capacitor approaches zero, the capacitive reactance of that cu)q3 -i -tecskdhel/ ,apacitor

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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 t2s ( (ncuf7azxhe voltages of the inductor and capacitor in a RLC series circuits7f (ax2(uncz?

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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 ano 85lm5zy;. j4n5a7wczk suas RLC circuit 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 cirnx/qlzs/t efu;z1 5m8cuit increases if R increases. When is this statement true e;/lqsxzn t81zm5/fu?

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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. h(a(,zbc3 re qr0fj,e The impedance of the circuit 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 circuit. The impedance of 42v6 omu4(sa2m /gyzp* w: i8p gwqnsgthe 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 seri. 7i vf;8ro-8 wnhadebes circuit, the resonant frequency of that circa8dowir b-f. 7n;8 hveuit 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 resow 3, /rh1 omqmqv zkap2;8a)ecnance,

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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 occu.qm i(z +4klh(kb2pnzrs 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 9 8qzxjli. vahpgp 0k;**w) jkrotating in a uniform magnetic field of 0.20 x9pgjvk*8p l0w i*z; kha q.j)T. Find the magnetic flux through the loop when the plane of the loop and the magnetic 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 uniform2poiyhk so0)n o/g f,1z qs-b7 magnetic field of 0.20 T. Find the magnetic -z2kioysb pqs/of 1 ,g0 nh7o)flux through 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 rasw 7 xivd6xjii ./u))gah 29qvdius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the vi) .adqxgwii 7 jvhx)su/962loop 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 an ad2 a4o;afnbgi tf2/+3japdpx )justable 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 coil changes n8pjys oceb/28 y*/dz e*ue t9from $4.0 \times 10^{-5} \; Wb$ 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 squf4y,tya)u 4yaare frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly4a y4),atuyf y from 0.50 T to 0 in 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 15 turns and an area ofklfvi *v imy4v ;vp8.) $0.40 \; m^{2}$ 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 and area 3euep q4 -e1at$0.20 \; m^{2}$ 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 horizontally at a location where thd wzcho,/ lr4,e downward compondlr4wh ,c /,ozent of the Earth'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 cons,iqp )3xauxuo0rm.mpj/ . .a4maxjxl1-xfh ; tant angular velocity of 2.0 rad/s about a vertical axis through one of itml..pjx h0a14jr/uf mixp, ;o .)xxq -a3uaxms 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 50jzat v0e-bdu,2t 9.mo:q-6fu-tygaj 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 turn:xldc cnskhtqw;ep-hw 9: )0:s 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 rectnk6qghf *e0,5q:hw(oda/ lrct) jls3 angular loops on its armature. Each loop is 12 cm long andd3g: hn*a,o6q( c jtq5l/e kslwr0)hf 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 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 cons0 hj6 ntiok40wists 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 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 generaq4zzsh0e,;h-qx b6 8qyfl 6vvtor with an output of 12 V maxy6, z8x; s0zqv-bqf4v qhl6ehimum when rotated 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 g.e3c ix r:/rgbenerator 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 a resistanceph7o.9bxiyv8 )p l1vu 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 mr ddvsn1q33wo )9q su8otor have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it geneur d8 sqvo1 sqwd33)n9rates 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 resish0ly avmzwa5. tm .:-(kt:hdntance 6.0 W is connected to a 24-V power supply. The oamt:(.ha- 0mkn:ylw d5. vz thperating 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 coizg30u01 e ssk9c 1eunnnected to a 24-V power supply. The operating current is 1.0 A at f1 ze09eguun s30i1sckull 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 resistax m/ 0a)dqan)snce 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. Whaas m)0nq/ )xdat 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 2 w ;w.mykb,jzx(cpx/needed 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 trans1 o :hdog(rb*+b8 ll:zql ozh-former causes 14 A to flow in the secondary. How manob- q+bzll: z*dg:ho h8l1r o(y 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 necessarym:m/ 2 5ho* sgl e*ffe ubppai,4iip;( in a 110-V primary if the 24-V secondary has 1e**f lp4(epgm ui5/i ;afbs2iomh p,:00 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 primary coil de0f *wwe:5heand a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the curren5: w0ehfe *dewt 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 transfzrl b1v.j7pryotrf+ 0at4y52 ormer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondayr5r4 1 oyttra0 lz f2b7vpj.+ry?

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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 p5 rx4 t)xw:vtsign transformer provides 7500 V at 10.0 mA. The primaryx5rtp: )4xtw v coil operates 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 60 turns on its primary coil and 300 turns on1 x:fkojjd.ba m42wz3 its secondary coil. If 120 V at 2 oz bj2d4wf3. k1xa:jm.0 A is 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 its primary coil artq y75phu:3 rd*foq)-wy 9o/zals 7vnd 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the pq:5ousd ho/w zv r7 -7)ap*r3yt9yqfl rimary, what 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 transformer has 100 turns and its secondary has 200 turns. :dg,3g b2ylymfs-u5 f If the input current at the primary is 100 A, we can expect the output current at the secondarf2gl ,u- ds g3yyb5f:my 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 aatn.bp0w jz,h,l aw2,k0h6 t q,su (kgnd its secondary has 200 turns. If the input voltage to the primary is 100 V, wlw, t2nh,0hjkgs,p w,tk baqu (0 .z6ae 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 transz,0qn9 qs+:ujrvn(e )(vacdyt a k8m0former has 100 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 (etjk qm(rdnv:)n9u qs0y a8a0v+(, zcneglecting 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 up3fj e)( v.kdbac bi7)p to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of c)f.j)v3bd a7(bipk e 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 cur+ hrm*u3clsrt p pm)s8, q-0jsrent at 120 V. The voltage is usually stepped up to 4500 V by a transformpq hl8m)t0rrp*s,j +sucsm 3-er and 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 60 A of current at 120 V. The voltage islzce; ):v iuk6 usually stepped up to 4500 V by a transformer and transmitted through a pol e;i)6v:zu ckwer 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 lingr(o d5fz g5*tcgh +y,e 50 km long has a total 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 ih,* c 5(dgz5gyr+tgfo s stepped up with 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 resistancm-dj .( kkwwg qn537bdp2us 9ibs(q u8e of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss d 5wn .qsjbq-(pd7uuwg92 3d(bksm8kiue 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 h9 6i a6pmdhu:much less power would be lost if the power were transmitted at p9:6 6h haduim3000 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. vh728)slg k vumb)nx,x1 kwz- It is to be transmitted on a line with resistance o1zkv s,v) kn8m wlg2xbxu)- h7f 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 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 stored7mn t)9)bilb24s,s+ e4d3hiubsi gst in the coil's mai,9ts) g4t lbbs 27mh +ss)e4id uin3bgnetic 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 ay2hb -) syt,wrnd an 18-H inductor. What is this cihwysrb-2, ty )rcuit'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 voltage is 1urk pk+03wr3k4c8u nj20 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 ouq*sa))ndi :r nyf+2 )jf8alartlet. 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. What is the resistance of t *jo 9pxly1. ,baq3tomhe lamjtbmyo*a , olx3 .pq19p?

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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 power smc)7;6vrr 8 ngo)d(.tt b y;,xbqnrviupply. What is the peak current through the resigx. (m;bqo )t86,c v7nyi dbnrtrv)r;stor?

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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 h:ximh 8zi+n9. What is the power dissipated in the resisto h i:8z+hnxm9ir?

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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 5g fh:hk,v,if xs4;l v90-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 resistor is r zz7i 5ge;xy: )mve;x$I = 0.80 \sin (240 t)$. 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 an.xe +uf x80z no27wy/b qww)n 50-W 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 inductorb70 tv5 jz;m )uj*mfiq 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 coi q o0f qwac b)*b2hva6y0nvx8da j)7*5py-dmil 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 14.0-mH coil have 14.0 W of inductive real5f 9c0wl8j2bgbi+mu xc 0+lmctance?

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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 reactog 9ydkbhp4ml4er4og4/ dq x( t*hv1-ance 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 ath7fqoergy1: x00fm./ y 8yjjy a frequency of 20 kHz is app 0greh0. yy1x7m/:8 yjofyqjf lied 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 t:0 0kusvf)pscdu6:nlg vv. h0fn0l2 li-b m8mhrough a 2.50-mH coil 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 reactancv*3vl,9 7razh23rt op2dge kce of 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 capacitive reactance at z2m jc.gkj+ 3yf4w b3s;)po qelu3ln210 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 capacitor srbbs-cx9 hz, vs514bg.fuv2have 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 re ia5z grop+kle8n)5c87x( wd,pqamfn :p)k7l actance of a 0.010-mF capacitor be 100 W 5 zerqppl,g7f m(n8)wain+axo57 :dplck) k8?

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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 th 34,xvw*ipp(y- xutlh rough 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 12.0 W resistance, 69f+xad4 ly x tbqynsafw)hqu8z),9o 6n/5dv 15.0 W inductive reactance, and lqt9b5)hw f 46xxu +q8/o) fsvadnandz y,9y6 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 t 3iyhxoo,:twl 0qs6: 6ys7thHz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connec sthi3 :woys6l6tx70,qyo h: tted 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 re vf :(fp2io+/x/yq 3y3zr rc bz+(dwuysistor, 20-mH coil, and 1.0-mF capacitor are connected ycr 2o/ xurzy+d(v3zqb :(wpi3ff +y/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 ax bfyd/9n/gmbc2/35dnv e. 1 xiu* maa 20-mH inductor, what is the impedance at 1000 Hbb*39fu d5an//myx gadvn /mecx. i12z?

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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 i*tpnqg+/vm 5gq h.6 lhn series with a 20-mH inductor, what is the phase angle at 1000 Hzhqgt. n*h6g+ lv mq5p/?

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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 circuihs9btnu e9e +d xg )f/)om91uet with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W atuefe 9d )u+sh9ge/ xmn9obt)1 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 100ug/cv )c2u0l y-W resistor and 15-mH coil to get a t)cvg0clu yu2/otal 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 indkgz kw7da2 y+8uctor at 5000 Hz for a tot kk8z2y+ dwa7gal impedance 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 resistor at 1.0-MHz for si739 : ocvm/h+turw7 l*vj ona total impus*+homcr37 o jl9:iv nvt7/wedance 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 capacitoxmd2 e (ju an 4pbn(2k:kjau78 zhle2h.r;p:q r. What is the impedance at 107k x8h h2p.rqnj ueaa22b ;4p( zdn :lm:uek(j00 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 in series with a 10-mF capacitor u+ rv3v/ n 22 7(lvhe dhqon+tmfwv,o7at 1.0 kHz for a total impedance of 4h,q7/hv lomte n3r+w+vdo vf2 u(72vn5 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 series with a 10-mF capacitor 50kxuvc14luvrl; iz0 ud l,awtjq7 60 at 1.0 kHz for a phase a5 uj40 uuav0ilt6lrq1,dc;w l 7x0vzkngle 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 series2us8 x;*ko(wf0 mta bq with a 30-W resistor at 1.0 kHz for a total impeda(wk q;sx bam2t*0o uf8nce 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 seriescghms:bg o1tt;f 7;0g with a 100-mF capacitor at 120 Hz. What is the phase angfmgs;gt1 h7bog0tc :;le?

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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 *,eshcx2a/:ccxhi x.ocol-( a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series( oh*/ic:a,c xc-o. xx hcsel2?

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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 capacitwmhc/h4 * /k+d *algopor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply./p/c +k*hw ghdam4 l*o 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 capacitor of capacitive reacpogf: n- vo-geu.m zs qi6200gtance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What csq-6npg02z:f m ig.e -v oo0ugurrent 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 forj6 m7(bvkuz rzcr6dp28 jh*q 9 a series RLC circuit containing a 50-W resistor, a 10-mF capacitoqh bp7m8jcz6 j* vk( rudr26z9r, 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 in series with a 500-Wpgzta/-fkw, s+9r-m n resistor for a phase angle ofz, f+ ptr-anks9w-gm/ $40^{\circ}$ 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+c* *mphv yu0upswk29 , L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the drivinpv *uk w* 0mu+ch9pys2g 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 rq,aoxnw :8;o series circuit with 12.0 W resistance, 15.0 W inductiv,8wra:xqn o o;e reactance, and 10.0 W capacitive 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 circ0xol( .5nsf q/v zb3iudc4jgcb ;axelv 8.u,2 uit 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 resistance of 30 W. W3-xp lw4;s.)f , x hani+gquvz2f, lmrhat is th ulf rn+vhf,.x,g32;s4lwzamx- i)pq e power 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 se-p; -idz fqcwyhbc )m5y*z0l2ries RLC circuit containing a 50-W resistor, a 10-mF capacitoi-2zf5w;yl *)pbq0c y c-hdz mr, and a 0.45-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 w;o w93g :4qcftwf n/sfrequency of a 1.0-mF capacitor and a 15-mH coil in series?: gc4;nqw/3f tsfo w9w

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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 sej,;lqeq 0a(xr ries with a 4.7-mF capacitor for a resonant frequency of 10q x j0le(a;,qr 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 serbod:bcu352 bye/7gy( a w+kquies with a 3.7-mH inductor for a resonant frequd(qbk+2/ yo57gb ec3b u: wuayency 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 placed5n( ip b-pzg(r .;l,)d pcapwc in series with a 30-W resistor and a 40-mH coil b;pwcld ip a,gp-) pncz(.(r5if the resonant frequency of the circuit is to be 1000 Hz?

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