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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://autodiscover.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://autodiscover.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 units of16-ou9k8t wblns,j e*0 juos5ol7i tc 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 inde7n hq) 7bpos(1at s/iuction 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 coil produces what kind of change on t78 -gxgcq8te nhe ind-ct8e gx8 qng7uced $emf$, 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 )by y50ev j:s6 z*qyybwire produces what kind of zb *qy6vs:0yybej)5ychange on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what hxh)a /w0x (:3; kvopvw0bx me uvdj46kind of change on the inducejax evwh;0:( ob43d06uw)/p kvxm vxhd $emf$, 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 fk(*1e uy;v3jwescug wtl)5p) rom a magnetic 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 an induces3qco -;lauj(ykx*;m cz- h +fd current in a conductor will be k;; juf*h zl+3 amxcs(oyqc- -that which tends to produce 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 / x9tm qfr 1ry5o;yeb(fq.u7h bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from abov9ye; bx1 qr hfr7uy5qfo .(tm/e)

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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 km.7b 9 biwj 4qypvx 10q1tf u36sy8lha horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from abo61.yh m0 98slqjvkxwbi q14yb 37uf tpve)

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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 pojao ucq(a,0w9c y;*9kq ,qouuq1 v.ieints straight up. The magnetic field vanishes suddenly. When vie u;19wq,,y c*je (uacqo vqu0.q a9ikowed 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 magnetic field vectn/7 9def*.q*h 1l mftv voj5xkor points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction ofod/tx19 v*f*f7qmh v.jnl 5ke 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 rewcg8rtfu zhfr(-;(s ,c ; jb:jgion where the magnetic field points straight down. The magnetic rftj;8;(f,(-h cjz sr:gcbuwfield disappears suddenly. 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 e y)c1;p5 zw9eay2tza kver-increasing current northwa 2apt9ceza;15ywk yz)rd. Two coils of wire lie flat on the table, one 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 wire with the north pole entering fivz*dqu6lp 7(w lx2*w5: qszv wrst. As the north pzvv2*zx6lls (dw:w 5q7* uqwpole 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 amx 2c vev40vi*5b- ozzn axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the ooze 0v5 mvz4x*vci -b2rientation 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 w,;83q9n+y r ;fqcre9ujsq68pdwguhcire is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uq, 8w;dry9eq g u +6;c3s9j8chpqur nfniform 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. tdht65k 2jy,d
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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 umthg6j 8u hz6zj63g0z(3h ds$emf$ 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 ma oi3wf-0aasz3(p.edy -m f;bagnetic 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 non7 +il vfzj6i7w pbf7yy1+rti5,cv, trthward at constant velocity through a magnetic field that points ++ 7fi,1tvjp7 zf7irivl5b 6wcyt ,yn 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 rota(0fn+n qvwe31xc 3d cates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transfog:: efu ro4hopo66uk-rms

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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 frequerxut2s h :7ob;,+bgqo,l on8j i, hif6ncy of the bg 6872hn+o ,loqjbf; ,it,x:osh iru$emf$ 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 usedj 6bdqo- l1;hk 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 thatn j1nu791eptj

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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 mo0z il y.3ifd5mre loops than the primary coi0m3 ily5izdf. l 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 primary coil contains more loops than the secondaryu0ttfve f3d3v by5,w7l o:bn8 ;g+vv y coi:+fe0d,lt8 w 3 5fygvuvb nt v7by;3ovl then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the poydkvj7 5b l-.awer 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 ci5t):; -hmnunq,csf( sum.lyx-x 1myrrcuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in sexyeea2e,i e( zn92eq1ries to an ideal battery of constant terminal volta n (ee, a2q9ey1xieze2ge. At 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 seru/ v(st5a n6-fxf/wijies to an ideal battery of constant terminal voltage. At the moment contact wf/a65 j/t-nxif (usv is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and res37ae9 a35k xya h8zyuph)i-ccg*m(afistance 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 is9k5czb 1 9 9a,iyhzcro 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 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 teq j:8s- r-r( ncp.crare connected in series to a battery. The time constantc rtcj- -e rqn.r(ps8: for the circuit represents 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 series to a battery. The zlbi) 3ymd n32r:l1 rbq /msn)battery is sunm) y2q1iz r)lnbd/rs l33b:m ddenly removed 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 exc)zy40 -uxe8 zyljp4 hrept:

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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, the culm;+g9s jcn3 yrrent

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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 potky/0pg h6hx/d j,1jg wer supply. In this circuit, the currenthjt6x y/1h gdg/ kj0,p

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the sij:x xr1o+l/)c 4dcyfrequenjocslyxdi/x)+rc 1 :4cy is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the inductive4 n)n )vo/qess reactance of that inductoro) v/es)4nnq s

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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, thgq oph7v)e*t,p.isazvab 9 ckj*4 s a)u-k1o2e inductive resc )q-4vaptuvi9go.1ape*b, zo h7ksj *2ak)actance 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 supply. In ypv -,,rag p zmmw;y4)4ycfr, this circuit, the currep r 4r y4f;,mc)aywgz,pym-v,nt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance q 3fby5)bt0cdbd; 3z ain an ac circuit changes by what factor when the frequencydf3) 5; bbcdy3aztq 0b is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the gw qbfgmm9 kg8, d33hsgt1ebc ;10/in capacitive r1gq 1;,0hggm 3gtw m3bsk8 ecbin9/d feactance 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 inductor and capaci 4(4)cqb r n+gp4opsnftor in a RLC series ci n+pn4)cfgb(rp o qs44rcuit?

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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 ism+6i m1ag;eude yc3f 7 4jfef s6x;hkp74f/j s 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 circtu7z-tu52n xa pbnx(g0 ,cae 4uit increases if R increases. When is this stateme0 ubat(2-ca 7e,ntpnxzg 5u4xnt 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 i )i5sy15l-/pt* pmff 4/gemc/k les kqncreases 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 the circuit increases o6/8kj-w)on*s-sllm4l q qbrif $X_C$ 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 botfqhsxcq4 y,/ t+*1puvw*p4 ge6x ja+iq1hfr2h double in an LRC series circuit, the resoqvhc,*tx46 +jfp xq*gsre4wpaf 1 hqu+ 12i/ynant frequency 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 appsdnw :4 cc7o*dlied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurtq+i x : 1qdr/8ci-7swfzr-bo s 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 0s.pgnut:m (13jzp8q03hk p jr.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 loop and the magnetic field vector are parp8(qkt0 3rsphp3mj.z jn:1g u allel.

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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 szro+ i.1uf, 5y npx-qm is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop andq,y1.uf+nxip -oz 5rs 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 field of 0.4a*z wxztkv 2 sf9rm;520 T. Find t9a2rwmvxz5;z 4*sfk the magnetic 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 an adjustable single loop is reduced fr 9: ) jg(ysobre5h7ccjom $1.0 \; m^{2}$ 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 chanr9rbvw5vk5 p ,x,ims*ges 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 miejtx(.d; j l(1*vzm200 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. Iz tjv1(mm xl ;jid(e.*f the field changes uniformly 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-kd hb)y(m +7w-ywp uz 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 and prn07p w5f+ny area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies hori9vt 5q6n;0su1 wqnxzwzontally at a location where the do6unw;xqn0q9tv 1sw5 z wnward component 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 5bwmgh w 2bi4l;u8g6/j4mvel m long rotates at 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 6w 4mwv2 l ;4/ebghul85mbj ig$5.0 \times 10^{-5} \; T$. 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 cross-see(crn;m gb7d 5ctional 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 turbv5yxo pz:y(w:a4) mwa.l10dim5hz ins 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 5 2qlyl a2kmv1r8pmq* rectangular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of lpm* ma8l5kqq2rv2y1this 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 consis03qo0kw3 7nr2jge hq hts 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 construr ; ; v. e(ea70pctwc;ex;urwsct a simple AC generator with an output of 12 V maxiawr.pcxrw;e ue 7;c;0;v(te smum 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 generator with a maximumc m bwn/7fc7i orr/ d,l2n2fj9 $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operat7jd qoam kpt *9syr t(1)(r*ches 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. The motor operates la;0h31 6abepjrur.a on 120 V AC, and wlauj.rh 0 ep ba6r3;1ahen 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 pow; ,y-z7k ymtller supply. The operating current is 1.0 A. What is th yk7l,t-m;yz le 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 c4(e7 zqtgmpm 3onnected to a 24-V power supply. The operating current is 1.0 A at fullm q47zge3mpt( speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance hg nk4 scc+ fx;qos1ui6;y(o 96.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the x9s1;6 4c yo+; gsohifun(qk cback $emf$ 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 hp ei/8lfhlm 3; 7jd+4pygba.svj k./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 seco;l 0izp.qf;tl)v7l zxndary. How many turns are in; f7zl.lz0lix vp)q ;t 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, ho4aqs0ql ;1y8q vdm efefkq1wb /y,9l4 w many turns are necessary in a 110-V primary if the 24-V se1kb;yfes eqq,vl 49ldqamy8f 04/ wq1condary 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 aj:406yl ajoop *g)d li 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what i4: dp l*og lyjj0a6)ois 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. p;6(uylsdhm:m t ou60 Assuming 100% efficiency, how many amps at 24 V ca6 mpsu0omud6t(yh : ;ln 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 wnt8z4 -kf 51tzt+tvisp,r u5 transformer provides 7500 V at 10.0 mA. The prft4nv u +z5k-p85t s,ttirz1wimary 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 60bb enb,xp d94pdp.,+o turns on its primary coil and 300 turns on its secondary coil. If 120 V+x eo,pn,d pd. pbb9b4 at 2.0 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 andu7 :/uibjl3qsx ,3p0mxsi2 hz 300 turns on its secondary coil. If 120 V at 2.0 A is applied to pm iu 3us3lz,7jxq b/s0xh:i2 the primary, 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 transfyr : 8rs0,tg+ ,xrr6gcugr1gf ormer has 100 turns and its secondary has 200 turns. If the input current at the primary r :6grgt,sxggcrry, 18 ur0 +fis 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 transfohgnf0.gm0 u2 rus(ua 4rmer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of tnh0rg0as umug.24 u (fhe 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 w gt-;1e,jzbw 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictiona-;jw1b,etz wg l 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 cu-n(:bz qnja2 irrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resq n-azb2( i:njistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually ste (9c1pqwx c.mek(y3b tpped up to 4500 V by a transformer and transmittqwcb( xy(m9et p k.c13ed 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 vkogne 1c 721yroltage is usually stepped up to 4500 V by a transformer and transmitted throuykc g7rn o12e1gh 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 pd*vi .- k1uzfda +gk150 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 is stepped up with a transformer wig *-d.ivak1+zkp d1futh 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 lonvl+cni61 aqme/ j+8vtg has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In ord+qle 1ajnm6vc i/+tv8 er 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 1 lugmna8l2 e7dr20qx 6000 V. How much less power would be lost if the poua76q22mr08 lxd nglewer were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a ugbqh(wed icsg 12( 0w2knt(ftz z, 9;line with resistanctk b(nu2gf;qzw,ze d( 9w0gc2(is t1 he of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to 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 the coilj ;4age ;zlqh e01xz+ 2bn9qp.i9 iaeb'sxea940be i.9h2zqa+; ; p nbe1zliq jg magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. What is t5u2gd+qx zr-chis circuit's time cog-x qc2rdz 5u+nstant?

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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 rmsxo oge4fjw3/; 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 outles-3drlg) f -xit. 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 o6.jp vi(flg.tf the lap6(t. l.jfgvi mp?

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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 supply. What is the peak cury9gb fx cd5yqs.*.(hrrent through the resistdy *c xs.(.rgqfhy5b 9or?

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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 is0h bu ty9b)v9px5( thi the power dissipated in the tvhbp599(hui 0 t)ybxresistor?

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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 50c:9 (*i+bhn 3n zb +l8 b8 g4)dzoybevk0zlkja-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 a1v-mhuu +anb.-q yrt vkh 4k:9 50-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-W resistm5inpb 87,t )zb antb6or 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 inductor at 60 Hziv mhhg;2n,+ a?

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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 reace lxq(8k ksh so6 x09+wmes7v7tance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inducti8oh5e-d gr8-c zcc4l* pf-dwtve 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 reactan)r7t2rzkbnq,o k* b9fce 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 ;ill35en :-pf vgnx l820 kHz is agxpin8 5n3:;l vlfe-lpplied 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 1ubr 6gs4dfcg.e6:b yx(t4rm 910-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 of a 4.7-mF capacitor at 10 kH 2t ,+p.o a/f.xr p3nx+eybscg10sgwnz?

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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 10i.(hp3te 5aw ry.otxs 3 u-y1v)an7oe 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 have a reactancess20rkrk f -5s 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 be 1z 7wxlto3i*, (6 ypk7w* aakkw00 W?w*a7(lkawzp *w637y,ioxk kt

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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 cxb eqgdi buh5u 9 5o:*9sbg19*t0sowc apacitor 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 ci 3wd:7iwmf1 bbu3i9aprcuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capaciw7udi:19 bwfm3i a bp3tive 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, abuoi;pp ,(b9 rnd 1.0-mF capacitor are connbro ,9b iup;(pected 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,f2l wa+2aur53-mo2 lahsiv-h 20-mH coil, and 1.0-mF ca l5i2-h-fvlurm+ohaa2 2sw3 apacitor 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 serindx w,mz)+v2b sd* 0wbes with a 20-mH inductor, what is the impedance at dwd2 b ,wxbnm)szv+*0 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is +d7.7mbpv5 bncoy10 hv,befqthe phas7f7dv5m p.ce1qhy v b +bon0,be 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 a series circuit with a 20-mH c*vdnk9s:0oh zy t6 k6 2qyxqm7oil and 1.0-mF capacitor for a total impedance of 100 W atqz:n6o sh yx 0dk7qvy6kt92* m 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 capacitandcb/0l3v t;5yh unsv55fo *t:wt w op6ces is needed in series with a 100-W resistor and 15-mH cpv6f b 5ttydv:ltn0s5ucwwoh3o 5;*/oil to get 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 in97v7u:+crbq( , ib0mneksmb)d0vjx k series with a 450-mH inductor at 5000 Hz for a total impedanci:ms7x 7ev090 cq nbv,b)kkurb m+d( je 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 s)wu opwlot/2 hj:n5 o*eries with a 100-kW resistor at 1.0-MHz for a total )/ol*:punwojo wt25h 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 conneyz 6uho6zg w6n cdg.:0cted in series with a 20-mF capacitor. What is the impedance at 1z6 hg:gud60 oyc.6nzw000 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 wiug)dy; hhpgp dd 5,pl; f+1+wnth a 10-mF capacitor at 1.0 kHz for a total impedance of 45 W?gnd1fy+ h)g,udwpdp;p ;l +h5

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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 wiz (7 e7lkm;wg*lov1 tvj4cp w:th a 10-mF capacitor at 1.0 kHz for a phase angle of 4cp m1vj7z* lvwekol :t(;7gw$40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is 42.ym kuuc5qqneeded in series with a 30-W resistor at 1.0 kHz for a total impedany.mqu542uq k cce of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. Whmfnc)hw8: d )wat is the phase anglef)hc w8 dmw:)n?

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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 u i2+3-eid x.jkhnwrea4h;k5 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capai-h+h3 d5uejxr; 2ika nk .ew4citor 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 1gc+7ze kq, *+ rpmyp 9dd,n6hm00-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected ed c q,+ pmzd*6ph n+rygk,9m7to 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 capacitor of capacitive reactance 30 W, and an-bd wg*0nks1f h*+jkc inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power n1bd-c*ks+wj * 0f hgksource. 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 et)f/:zrg, zn s6r gl+:yyge( circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to fl:+gsy)r/g:(, tez r yn gez6a 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 wi wgx3 e78m njji3.w8fgmzsk97 th a 500-W resistor for a phase angle of8g egwzx79j 8m.3jni sk7 fwm3 $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what qn8n8h(bg s 3ofrequency should the circuit be driven in order to have maximum power transferred from the driving so38sq ( hgb8nonurce?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance,jey/ lc9eho50ul0y x,w (oh/j 15.0 W inductive reactance, and 10.0 W capacitive reactance, o h/9lwe xcolj5h(/0yuj0y,ewhen 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 circo2) .n2xkc*k/omefzz dbqvn5p*4h4o 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. What i z8ajxu z 32y-3/pfjdvx c7b)hs xf/)bj2p ydc7haxj 3- 3zvuz 8the 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 series RLC circuit co;ni 8o1a9rgoxgd/v1fel3e yx1q+ a/ lntaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power svn1;qyia 1x8e /3odlgxel 9/rog1fa+upply?

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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 freqh2tpp e5ny8,nu 2uz m 4e e46u,ihk;jg .glut8uency of a 1.0-mF capacitor and a 15-mH coil in series?u,iy2mtp 4g ;e82 4e 8.,lhz6 jukenut5gpuhn

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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 with a 4.7-mF capacitor for a resonan 7 24wwqb kzz;nv(bd6pt frequency of 10 kHdz w4k6nqvzp2 b;(7 bwz?

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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 reso cek3ilxgg(:;-e11vz pk wcp -nant frequency of 100ve-l1i 3 wzkk ; exc1gpp-(gc:0 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 8xgb44 m:vlgx - nz+k5ofrbor 0(mw1g30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 H4ozb+x4-n:gm5 0gkwvgrol8 (bmf1rx z?

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