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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 units of magneticqbu s ep::kby.j5p :hcpv7wtx6rao-of 3,y9 7 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 tt:69un/hyzmyl/ b:in erc:12 je4fy vhe $emf$ 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 loopn9k 16kek 2yg7w/nutu s of wire in a coil produces what kind of change on the induced ky1 9 gwu6n u2tn7ekk/$emf$, 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 magnetic9 pw*l 2 36kg+kwfdtsn field through a loop of wire produces what kindw9ts ln k3+pk6 d2f*wg of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind laf4(8kltvj x ai, t-:of change on the induced xalfti a :k48vt-,( lj$emf$, 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 ah)*.nr76 nbs(xv 3apnyosg4 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 inf p/r) sh/*eysu4 fhki+d 8d*bduced current in a conductor will be that which tends to produce whdd*pue 4 +f/bf/hk* sh)8rsy iich 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 jy2 c++u7fccuhorizontal table. A bar magnet is held above its center with its north pole pointing down. 7f u 2y++jcuccThe stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held r4, nt hpgt3t-above its center with its north pole pointing down, and releaserh 3t4tp, gnt-d. 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 5 m9 lm,9s ydlols610ib8jzjkpoints straight up. The magnetic field v1b989moslijjd yl0 m,s 5l zk6anishes suddenly. 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 to6xydp cgbp qd9uik1x* + nf51t +mg4u(p in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. Whequbnptxg 1di f+6*gcdmk+4 1px(y9u5 n viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region oacb3 9 wg,iq)d-jglvh 6m-3ewhere the magnetic field points straight down. The magnetic field disappears suvdg-,hjl) e3qib 9-w6g3c oamddenly. 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 ever-ii. krj zi7 10oc3jec.z4e/iqwncreasing current j oiej w/.3ei4q.1zk70 ci zcrnorthward. 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 pdx j.x)cm+m 2kole entering first. As the north pole enters the wire, the induced current will be (as viewed frk x.2mcjmx)d+ om 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 9v2+ s3 tzxg hrxcvh72at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight79zs3hh2cg+ xv2 vt xr down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed absr ,yjl +fwi .z6h+8hpbom+9i:qmc) xout 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 loop's axis of roi8 w qb+x )9sh,h+i6plzy rcj+ m.om:ftation 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.+hrrt(f v,ds1:1no0 y : ggjpi
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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 thnhwpon x) m-.8at 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 fiel )c/ mz)lyrci4a8l;a lv/fna.d. 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)tlmgw m+ d)q in(cm,0* is moved northward at constant velocity through a magnetic field that p +i w(m 0,qldgmnc)tm*oints 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 col;zd6 znma nw;odv.3(.pk 0 uvnstant 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 traptr6 (r e*7aad- )xseansforms

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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 eachh1h+xu n:c4 9zpvms2t j)u3bx second. The frequency of the p3xnh + bmv21 zcu9hjus )xt:4$emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used-i/ om er(c0pi 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 c7cv iw5d80g-xy/) fazyap0bthat

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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/ hjmjt(ix* x0 contains more loops than the primary coi0m *tjjxxih /(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 primavx5g46i1p.v m0 jq hpr4vsan7ry coil contains more loops than the secondary coil then i47nx0ap1j 4 vsr5mi pg6v.v qht 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 w.dtb,,p +ibba (m 7bnpower 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,6sdw2j39 aza 0f l8jfc

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal bat bxll9py3b;qc1;bdy7tery of constant terb; bl 1yqx l9;dyp73cbminal voltage. 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 series to an ideal battervs hm 1mawqkbck/5ql1520 3vo y of constant terminal voltage. At the moment contact is made wit/hv3b 51m1 lso2kq 0acq5kwm vh 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 resistance R is connectes0rd)za73 i .ajta*njd 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 ie h mtk8nn 4 x8c+ ,nels4,agvdj/o/z+s 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 are connecte7n*xa3lvp1e +n vptmty79 n g3d in series to a battery. The time constant for the circuit rep n*1t lv3ne9 7p3xgmatv7npy+resents 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-hn,7 . sp:.aqmo g 6ndixfvq* are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time reqn.f,*vnd .6qphq:s7i- og axmuired 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 same0, slydpu3 -mmb:ma/jv i7b-b 2tazc8 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 circujm+rp9 ,a2xa1dua1ozcez- * zit, 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 p;s-fo8t1rqnod* v me/j 3n2kb ower supply. In this circuit, the currentmk1qtn*2 dn;-bj 8osve3o/ rf

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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 chan4ra vum8+osy)ges by what factor when the frequency irsa8vuom +) 4ys 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 do:o (vd o-j w4mwgak,2vs* r4zbubled, the inductive reactance of that indu(b 2jvawvo*rwd44k:gso ,z-mctor

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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 ab7o 2/pi,m*f9 f fz1teh5ycpapproaches zero, the inductive reactance of t5zmo9patef,bifp1 chy* 2 f/7 hat coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit,ll *gbs7t-1 gq the currentgtb ll 7*sq1-g

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor wheng) t g; i44syk* sj o0jhn/+;spf;zktxzj9m,n the frequency is tripj; 4*zngttizm,xssp sk gkojy/nh0;;fj49 + ) led?

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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 acrot t*x.vcgf d-2ss a capacitor approaches zero, the capacitive reactancetd*g2vcx t.-f 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 betwee7a dkgtt) :p+tm598bxojbn( en the voltages of the inductor and capacitor in a R:7)d+b xo8 5tnmbatpkt9(e gjLC series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an4o fdho7 xw 9l2,li/co 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.z, * p2n.cv-i/p 2rmjrib9qel The impedance of the circuit increases if R increases. When is this p cb2p9inm-rrzle v2,/.iq j*statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. Tm d5f,bzav6eu;6l o .che 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 ofysnv3m my8(k5 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 djovg 09vz:45 i +xju/glfrs1l5wzez :ouble in an LRC series circuit, the reso0jjxe9vr1: /z:u i 4wvzso flz5g+lg5 nant 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 applied voltage. A. hch/puqzu5: t resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs ya.cf kk) *01.zc bbblmu*my7when

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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 0.10he 880zodbss1 m is rotating in a uniform magnetic field of 0.20 T. Fbez8doh1 8 0ssind 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 uniform magnetic field of 0.2om un4w37 3:q yy4esqu0 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.3u qw4nu3e o7mys4:q y

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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 magne2owq kjj0tko alx h3m.b: 01;wtic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fieqa01ob h3 t;mw2ok kxlw:.jj0ld 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 f-p ass(ten ,7zrnvb0b-gw-p 7rom $1.0 \; m^{2}$ 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 changl:pvo:/ a,z z,c.bn2 w b:scwues from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sidel,8rhxv7d1ux 0y* q k yeb(nu1s 18 cm. A uniform magnetic field is applied perpendicular to the plane v*r(0e 8xxhdyuk u l,1nyb1q7 of the coil. If 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-e/-a axw;i s4gzae1v 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 yzkz ,o fbo +g8log);+6tjw(carea $0.20 \; m^{2}$ 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 wia+rbc+a-v 4s h5qqy7qw ,e: izng span of 60 m flies horizontally at a location where the downward componen+ a5a:q-+ qh7brcve yq,iwsz4t 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 b qxuf w/+b;8zoar that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a verticuz8 foqxw/b+;al axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops anhd 4izt o(8+zad 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 1,jjnoy8;xo2, svw5 sk00 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 re1wm2 qpt8 vll )q)u6zmctangular loops on its armature. Each loop is 12 cm long and 8 cm w)pumwl )q6vl m1zqt28ide. 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 consists of 100 turp7v+.jng4dj r,lj5p fns 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 genega gvs7rc e25s+d p1(vrator with an output of 12 V maximum when rotate(ed vasg1sr5 pv g7c2+d 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 g oefq 6trgs tn+5 jdih(7o3k-tt4;b1maximum $emf$ 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 opers1bjt5xpmwos q4 ;:l+ates 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 oper)m pp/l /s: crpidl),hates on 120 V AC, and when runningh) l)s pi,m:lp/p/ rdc 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 cofa 9m2 +o3diyhnnected to a 24-V power supply. The operating current is 1f+ahym i3do2 9.0 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(g1:hq u2:s.7nohl hnx x5ybp W is connected to a 24-V power supply. The operayp1hxu n7hs5 bh 2.(:q:xon glting current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 Wl,d 1;(pdvuq- (tgu4xsn:fe xl vcu(pm cq-8: is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the b, uv-c-xd uc(1;up:qfvnp4 t(: d8gel qmx sl(ack $emf$ 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 ofh4 j6x n w.0ppsth66tt $120 \; V$ 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 primar tety) ie+9.djy of a transformer causes 14 A to flow in the secondary. How many turns are in the tj )+eit.9deysecondary?

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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 tu:w zhl j3t.f(erns are necessary in a 110-V primary if the 24-V secondary h. hjt:3(zle fwas 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 pg :erujym30f2 r(g gqy9m8 .xurimary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in thr9ym2uj 0 ygm:fg.r qe83x u(ge 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 trans+5g(,leuhgnc.g zd48s)/ wo0oiv uae former. Assuming 100% efficiency, how many amps at 24 V can flow in the secondar8e oz0g+wo(ai) vsl4.5, hcge g uu/dny?

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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 provl tnl 1s96isrbe2*x6jides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does thet29l r b6ijesn1sx* 6l 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 on its secoz:d-t w1 mxz-vndary coz-z1td m:-xw vil. If 120 V 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 and 300 t6tz/j/ /n 85ap/acssi f0 gfrrurns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what cur ///zf6csraisnf 58 j pa0/rtgrent 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 secon:icolcvu)a: f d*9 .nodary has 200 turns. If toli:c*. vunf d9ac)o:he input current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. I l5ddes 7n r/dd,g4xz.f the input voltage to t4lr7nd,d.egd5x /dzs he primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. v*x/ s ;vesnb2 If the power input to t*x2nvs se; bv/he primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usuaptq7 6scwpg322f p 7rnlly stepped up to 4500 V by a transformer and transmitted fr snc236qpgpw7 72tp through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltkh.m: gey /h,sage is usually stepped up to 4500 V by a transformer and transmitted through a power line of to: s,/kyhe g.hmtal 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 ig (xcw ;ke+7naxqo a40k d9)bV. 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 transmission line if the voltage is nodi0ncoq k(a9bx;+ ew)k 4gx7at 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 lf+2g0 u.h v1ckvb:et8wq q rd1ong has a total resistance of 0.60 W. A generator produces 100 V at 70 gw8:u0 veh1tqd2c bkr qf+.1vA. 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 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 resistacv j v.buzso c*(7+ay1nce 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 of the orig.zov uv( c7s+*1jyba cinal 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 yys(af)0z m )cat 1000 V. How much less power would be lost if the power were transmitted at y )az()cf s0ym3000 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 nb wmq.cp9y9:czbt 6 5440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up bt ybn9 .m qwpcc:z596with 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 energy0e5 lv p5u rvj8hbq- ua-zf+l/ is stored in the coil's mazpqlea 5 - 80r -hflvj/5vb+uugnetic 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 6.78tn0zaoejf r + 0+nx.d eepmj6fg;v.0-W resistor and an 18-H inductor. What is this circuit's time constantft.f8 7jjn+g.zm+e0vr 0aoe;d x 6npe?

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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 wh et1m 5eror;u0 pr0iodn/0i/ -m:hus aere the 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 is the peak cu dcv1x -inzpo.zya;l;eo iug5*4kl -3rrent?

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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 the laj6 meh7 2ethf(bwl0- dmj-lw (2emeb dfh0h67 tp?

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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 connected8 t+/ 4t7ofmv5bndniv to a 120-V ac power supply. What is the peak current thrmv tn/dfvio+t7n845 bough 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 aku7bx0 b h58-13,r ndhhyoq ig7fp:dpc power supply. What is the power dissipated in the resistor dkg -75pu0by81 h3q,bnpohdxfr ih:7?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor i 3fhyr0ked1m8 5obiy8s $I = 0.80 \sin (240 t)$. 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 ayl )16f9cnvuu2v 9 ddt 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 r ez tmgtl2*vep,-0a b4esistor 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-m5k, plhf.o bbspt:cr. p9dd(/H inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2gtl/(o8rf x. e1ce oc9.50-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 willts;)f ll -i:3nfj in1p a 14.0-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 reactance at 1000 h :k +g tap0),do eoa)ghx,h-qHz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows iny0i04ssnmhn 5yr ,v2 n a 60-mH inductor when 120 V AC at a frequency of 20 kHz is applied to i 40,0rvnsn 2h 5iymynst?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz sl3di 1sf3;a 6qxm( uxqource?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitivdk/;1d7urs2*sv+: xlwpoja v e reactance 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 1l( 3aif;feh8lej2 xgkdk 24.w*/o poi0 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- 8f jrb3f0xwz*mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capac d- xy27/p(-ux avlumzitor be 100 Wyvdz(7pm -xxu- 2ul/ a?

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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 ase7, ;5d3.yx rt pjxzj vhw a+svm1q2(19svfa 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 lt5k6b ygd+e-circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reet gl- 6dkb5y+actance?

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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, andfk6xc ,dri0 gc7i* f+i 1.0-mF capar0+i7 kficf *ix cd6g,citor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz t d3kgpwv) fq tea2:cy3/;;ye if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in3dwa)gqv :c3 p ;/tt;fy y2kee 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 in spue:d:u qx 5f::1dupductor, what is the impedanc:sud pud :1uqexpf5::e at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, wx36kgqli, .tf a0pec4hat is the phase angle at 1000 i 34.0xf cpelqtk6,agHz?

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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 coilu2p5v)gg b/qy and 1.0-mF capacitor for a total impedance of 100 W at 12u)byg/ gp 5vq500 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 followi yeerz5b9c3kjf66e x 71e w2lig +tw,vng capacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 12li 3e,tfvw jbg+1cye59 6 ezekr7w6x10 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 i jpv8 .3yi*j,fz*g emwn series with a 450-mH inductor at 5000 Hz for a total impedance of jipwj3*8vzf .m,gye *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 448q dpn2jgm5tzt w /ra 100-kW resistor at 1.0-MHz for a total impedancegpwd4 t8q/4zr2j 5n tm 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 ag50m-rm8v ofrh wumuz s 41.v -(8vacv 20-mF capacitor. What is the impedance at 1000 Hz vau0uv( gvhrzf15.mm 8sm8 4v-w-ocr?

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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 10n3ul/-shpwj ig1/y/r9wb ( o t-mF capacitor at 1.0 kHz for a total impedance o3blwtn i1w9uhp -jo/ s(r/yg/f 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capskw-bo e4 y5)xfca9w+acitor at 1.0 kHz for a phase 4)y ow95ck+-bxewsaf angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor atw/z 1e 0mz nc*-l gky7dco*3vb 1.0 kHz for a total impedance of */ wc1kbz elg*mny0-d vz73oc 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 dna s/ 6 /o0d0 zu1sfqqkza+icj mz6)9100-mF capacitor at 120 Hz. What is the phase an0izuc/sjfqmza6s kqd) 0 n/69z+oad1 gle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows aj+h7i,wa / haht 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor h , wh7/+ahiajare connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W rr lri,/, oldo;esistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What iso ,;/drlro,li 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 capacitoj157ek dzg6 /ns9zn uor of capacitive reactance 30 W, and an inductor of nj1/6dgknou57 szze 9 inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit conta c+.w9ew ph9nuining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz pocn9e. wup9h+ wwer 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-W resistor f1ft nd -lx3p6 tin;,khor a phase angle of 6tx3dit-n ,lkp f1hn;$40^{\circ}$ 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,eutph b 3ls4mrjv7-t, m2wd9 what frequency should the circuit be driven in order to have maximum power trm -u2t j9shrt 3p4le bm7d,,vwansferred 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 series circuit with 12.0 W u+3s ,uuocbc +resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V cuc+bsuu ,3+opower 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 circuirz,:hsrm8e el1 neg:6t 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 of0ipel+/u vlo2 60 W and a resistance of 30 W. What is the power facto ivo+pl02lu/er?

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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 forh)tx,vpxq a3+ybx xgv +*q*f0 a series RLC circuit containing a 50-W resistor, a 10-mF capacitor fa++qyx0hx*vpqx g)x, b3*v t, 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 frfz tlu0aq2 q(dca:37gv p7/s jequency of a 1.0-mF capacitor and a 15-mH coil in series?s /p(7f3vgcqlq2dtj7 0:auz a

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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.muckt3f1furl4jy* dx- p2nu9 xl k s ,00;ct4g7-mF capacitor for a resonant frequency of 10 lt91xmpur4t,kfud 0 24s;c 3fckxlyn -0j*gukHz?

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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 /qnsp di*q9orpyp9 4,or a resonant frequency of 100 ps nqrp9*q9ipyo, 4/d0 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 seriebmim; 4p.sbw ccy0yfi:1h 7mc346x lts with a 30-W resistor and a 40-mH coil icim0hfx sc; lciymbp46y317t b.w4m : f the resonant frequency of the circuit is to be 1000 Hz?

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