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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 of magnetic flu afca:o- d34f jw.3efn1y aq/nx 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 fws2ula; c8 ) n3 -t:refrupt6the $emf$ 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 wirz c57;oslr0q qe in a coil produces what kind of change on the in05osqr;ql7 zcduced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire produit vi e,0i ifm*xp9k;0ces what kind of change on the induced09;,fi*epmix0 t ikiv $emf$, 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 kin5o cj; .r(*nmyesmgt *d of change on the inducedrt;c msy(*gnm j.*o5e $emf$, 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 m :fy9*z gfm2ilagnetic 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 aetg 7ojvytqj.,cxo:26rr w u;p5z.;f n induced current in a conductor will be that which tends to prod; c2:q.wj5e.tfgpto oz rx,v uy6;7rjuce 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 zj3o(li;r *pc held above its center with its north pole pointing down. The stationary magnet in zo(3 l*j;cripduces (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,zv) x4bl w:dq3:c6 fflpl;gc magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when vilx;c) :l,gcfq zf3l p 4d6vw:bewed 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 magneticp(d4e lc;j, 6qy1,wl irto 1tj field vector points straight up. The magnetic field vanishes suddenly. When viey1t;6 dejpco, w,l41i( qr ljtwed 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 ta(o uva- wna3lan (14nhe magnetic field vector points straight up. The magnet u(anno4 (v1alaa -3nwic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontac*j+-64 wltmx vfjli(l table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, whawjfxmc64jt+ v*( i-llt 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 l9ira /l2+2 ob10 o ;xetufo6hx;aliohies on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either 9r2f xobe;o6a0 xthi+o/;u1o2ialhlside 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 thedsu tv t5,lex2be3-1 n5 )zlla north pole entering first. As the north pole enters the wire, the induceda s5, lvle)5ttx- dn3eluzb21 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 aboutkd;+nigjt.+ n an axis whose direction can be varied. In a region wh j+k d;ng.nit+ere 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 wiretl/htbqu/ pi)48f0slcf1 o7f is rotated at constant angular speed about an axis whose direction can be varied. In a region wht1sfq l0l8i /o7t uphc b/ff)4ere a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.cm2 re5/rml.4fzk/b7i3vme f
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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 4/esliro:td 4at 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 magn0vvvs 3zm-y3 detic 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 ioykwt /l83eo3o hf,zvme) h ,6n the east-west direction) is moved northward at constant veloc v, o3 myewh/fez6o3,)o8lkthity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular2 ube9guq- 2fio 45jvl 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 transforms,1kv qr a2u ktm.9tgw/

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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 frequency of6bc.fd2/ ,zz 8 3dpxpto(2xgnngaewryw / r:: thyt2n2/or: p. zg g a,nxxfcbprz/w8(3 edd6:we $emf$ 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 k/cd e0b 9s+ihde8i: eused 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 thzwly2 *22gns+z qyre6at

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the prg,5w2js cuw .ximary coil th. 5wwju,g 2scxen 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-s6ub .da hoy( more loops than the secondary coil then it ish-d.(bsu6 oa y 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 pjjg1a(;.-tekhlw vj 76 d;s vpower 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 ci; .+p:rt: /c2pgm jmq o(vyzdo8z*xbmrcuit,

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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 battery w,7ok(snc9omo5y ( 7qr2 mjrc of constant terminal volta ,rcso5 c(y7nkm 7qmw r2ooj9(ge. 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 serie l0dk o- gh.bz,ol)g)nwe.2li s to an ideal battery of constant terminal voltage.).n. olllgew2h0 dgo), z bi-k At the moment contact 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 resistax9*pojr -ja (lnce R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connectej6rc j0 t2e2y4ra g3etd 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 connecte/jb9c)c 9+ ooa5mel rgd in series to a battery. The time constant foraccgo+5mb 99lj)o /er 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 battery is),ipo7 f .u2.gewpnre suddenly removed from the circuit. The time constant for of the circuit represents the time required for tw)epg2or fi7p.e n ,.uhe 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 have9:*3pqa chuwhpr k .r,+jrd*v the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the c:m+p;uq vr5fxfyw( o8k1us q3urrent

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the curwf /v y.xe so6. 9a/smsa;l-wnren6ss/;w.xane.a os9myf-l/ vw t

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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 wb89*ef drw :s ww5b:vqhen the frequency is :d:9q*efb5wb wrwv8s 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 twygquh h f-p2/0q9wi 8(djw ;across an inductor is doubled, the inductive reactance of that inductor-w ;uf t9 p2jq8i0wqhydgh w/(

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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 ie 2mokqggq -7;nductive reactance of thge ;7q2 kgoqm-at 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 thde x wgq7o,:8pis circuit, the currewp :x,7gqeo 8dnt

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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 w swkn tl:s12xy94,houhen the frequentxnoku ,s4l2sy:h 1w 9cy 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 3d,o ia0gj wskerwe :,4zl+mt *ly;)rcapacitive l+:e;,0srwmt , y ) 34gljwz oi*erakdreactance 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 v p o9/-zu2fdc 3rfr pwxgxs+86mr4ds 3oltages of the inductor and capacitor in a RLC series circ ps3283p9rc zx4rd xf-+6d sroumf/wg uit?

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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 8d4lv8ugrvb r2+4g nsis 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 circuit increase*/nnpp 1ra9vwdjdy; ndvc,:5: / pxos s if R increases. When is this statement v wp/5x1nc:;sj9r/dd*nv :d ,ypn apotrue?

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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 imped6 x-ae/ pfv6 vf5dvm:bance 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 the circuit f;- qht kwglq ma;+z59increases 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 td7(2xtdsjom r6rnx b374- nkthe capacitance both double in an LRC series circuit, the resonant fr3d r6txn74(7bns-xmdok rtj 2equency 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 6(qyskj uil8ibz 3j(/an AC applied 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:;ykg*rl2 skidh4; jj (+dtgq RLC circuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field od+ aiyob) qc68f 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parabyqo)8i a6+dcllel.

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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 0.2a 1cb)n*w6 zscobq y7-0 T. Find the magnetic flux throa y71)-o6q wszn cc*bbugh the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotatino/qt.5ysa vn3 z7 etx5g 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 fieldx7nt yo3qv est5/z5.a 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 o,i9 +vgi dbb3qf an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a co wy.ll,-na:v2w z.p x j;ce2efil changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cm.rdm:l(a n, ms+ A uniform magnetic field is applied pms:raln +(md,erpendicular to the plane 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 15 turns and an area ofpq5dvt*,ng;d $0.40 \; m^{2}$ 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 ar r+pm3 hercz--ea $0.20 \; m^{2}$ 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 z5 4mnke9djl25rq9 go of 60 m flies horizontally at a location where the downward component on55m l2kgzjeq4 9o9rdf 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 bwin*nizw8 c0hy;/ u1h ar that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a verticalw1/8y;znu*chh wni 0 i 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 and a cross-sectnn4i .(ckndm(9ttt*r+ w7i 5p non:pt ional 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 consisvg6;7jb(- mtbd rs ls5ts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular l*oc y)8h pjm+a cp7dk+oops 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 magk* d7poc +a+) myjch8pnetic 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 consisl(ptg3dd+) wt5m ze- uts 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 generator with an/3mnp uopq/id m-3hn- ak xl(; output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil d;ok h-qnp- na3/mil3m / up(xis $100 \; cm^{2}$, 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 maxi-,p q5h+ngw9a3lpd c-rxjy0 zmum $emf$ 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 g5rtn0)upxe4 p; bx1lhave a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates on ;xnmp 5tv wh,.p8,euse/b 6sk7,mcxh qu:a:x 120 V ACq7c5bk mupm, xe x/:ts, wpv. 8h;us, ax6ne:h, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V pow20 dwzu)dawkdrs17 :s.okmr: er supply. The operating current is 1.0 A. What iswdd 7)wzmk a ok20s:rdur.:1 s 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 connecw ft,z:8ado/ba /4piy 4(bsek ted to a 24-V power supply. The operating current is 1.0 py,s zke//4a8d o(b4tfiw:a bA 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 W is connected to a 24-V power sd)p0y;7 8k (3h hrhtu fb7 ):syfrjkxgupply. The operating cu 8j )yg07;bxk:fk 3)rs7 fd(hrt uyhphrrent is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformertq eb. myl22ysi0+tfr6e w l69 is 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 transformer causes 14 A to flow inp6p2(shq ve ulpi8i:whro*4 7 the secondary. ihu*28po4ph 7 peirlqwsv (6:How many 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 necessary inf,* b8g5mwb bm a 110-V primary if the 24-V secondary has 100 turnsw5mg*,fmbbb8 ?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of2e us2oz,oiea/dg t46 a 500-turn primary coil and a 2000-turn secondary coil. If the current 2s/oze,io6adt4 g2u ein the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% efficiencd (4c2*oybsb46 khe kyy, how many amps o6c2k4*b(yd yesbh4 k at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign tranj tbzl0 ::s1c, or1hvssformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What doe 0vtbz jrhl1 :1so:s,cs 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 o0a ygns7p g*.j)pdh5 has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to*hng.d5pp70gos yaj) 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 pzk:1ym: tjfdq0-0jarrimary coil and 300 turns on its secondary coil.r-a0 d1z:: kymjt j0fq If 120 V at 2.0 A is applied to 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 transformer has 1058sy hni1u6 gb f4tes-0 turns and its secondary has 200 turns. If the 6tsf4e 8gi5n s-yh 1buinput 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 an txd2ly5lw-z7j 7kab:d its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to bl zbja2-yxl k :7wdt57e

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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 il*4iscmq 5+ij ts 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 (ne *lj 4i5+cmiqsglecting 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 steppe xfo ; ai(:wiuqz pzp,*r32o9; u1wisvd up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Fpa uxu *; (ris9w1 oqfozzpi3v2:wi; ,ind 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 Vdkdu vi e4 :-td:(xzn,olto1-. 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 n zktdo-v:x - ei4l:,(utd d1othe 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 cw6y ,;pjdbw6dbw r4 c5r6gq i8urrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if t6y5p w4ir;jgd6cwrw 68 d,b qbhe voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A gener)h8 :i5 2iatlhk/0ov hvaif b+ator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost i h+iv2ovaikiht0 / h bl)fa:85f 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 lhcyya(v mmo- b :;f2(yine 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 is stepped up with a tcm mf yyya:b2(-(h;o vransformer 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 ik4qmu yeo4)qq l(82ml8.jn yc.n( xw line at 1000 V. How much less power would be lost if the power werkqo4 8eljy( 2 4(nqmniwy.. x8lu)qmc e 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 2flw0sgh3;k e d7hx1o jn0x,i60 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 with a transformer if the power loss in transmission is not to exc 0, xx3eolhh 1dj0nw6s;g 7kifeed 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 :zn4tc s t9,zq:frk,A. How much energy is stored in the coil's magnetic field?4 q, ::z9szat rtc,nkf

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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 a0etz,nnqibo dg:m-gsja-5a 1(, 1ajcontains a 6.0-W resistor and an 18-H inductor. What is this ciremaib-s-g 11 aqgdt, n:ja,o(0z a5 njcuit'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 th18w* p qoemwe)v/req4e 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 intdus- o/dq81( i jcwy9zo a 120-V AC outlet. 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 j1 xt4 jq)owaoaz7 62einto a 120-V AC outlet. What is the resistance of the lam t 6zexj2aq7wo1 )4oajp?

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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 mpkpk.v*)p:x supply. What is the peak current t*p pkk p.)m:vxhrough 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 co33v ur5 eg1ducnnected to a 120-V ac power supply. What is the power dissipated in the3 cr35uevug1d resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resist )gf 50 kn :7+xds0ce;ilwsdjwor 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 refrihg d1+)es3gf v -2vsistor 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 rev n7 ip hpp:ao.y-or(s4.s w:hsistor 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 ofasjkl t2)zgy:-6 qob 6 a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil atxp 0 js7svjh 1z g0t2oy+;s-cc 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 wir;t4) whja2fuw+g a1/siv n*rll 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 indujr+vlr6 ynom -5 bv*yz48l;ckctive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a fre9,s66 wfcx1vzj0 yv3 tt+xmbw udil4 6quency of 20 kHz is ,wwv bf6y4sxd 1m0tx3 6 uzi9ljvc6+ tapplied 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 th j2rwxdk xz2 dp.9:;scrough 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 reactance of a 4.7-mF capacitor e k*ke1qe :vt1at 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 reacta d( q5-(tei 41r7nusbb ylkic9nce at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capakxy (b4hw. mvf .kjp7)citor 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 ax7xmq b2qtz3) 0.010-mF capacitor be 100 W?qm)t 2 x3xb7qz

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor fsm j;x .yi8(,a xr1ruat 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, 15.0 v,ai 5k.oa dz0W inductive50ada i.kz, vo reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz ieddt+ x00re/dsnh x2b+5ru7 yf a 100-W resistor, 20-mH coil, and 1.0-mF capac+udrnete20 b0d5ysx 7x+ hdr/itor 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 ifu2+vnaa: ri- m a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?n-aiam r2 v+u:

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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 inductor, whatxgxkokpk+s * ,h-o; )n is the imp hxg+k soxo;p)- kkn,*edance 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 ser12gkv l()s. +ztl msccies with a 20-mH inductor, what is the phase anc kvg.t zl(2+s s)m1lcgle 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 coil and 1.0-mF cepo+5 yhtsf (3 *u lvf(sxyl+1apacitor for u l1xy h( 3f++s*5o(syfp lvtea total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances if jwv :3yw4i-y7ap 3,+w)jm.zqf psw hs needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hza,pzw y : 3+yv)wq-iwj7 f3.h4jpwmsf?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for a to n4 p 8r2pl,c,wzb55hhxg36clb afce9tal impedance ofp8cb,br56c2acz3fe x,l n94hlgw5p h 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 c7gk)u: i.k8hhsi l5p 100-kW resistor at 1.0-MHz for a total imped78ci ku:hlg.i)khsp5ance 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 d: y(v q )bki.uxow jv-);sm2qin series with a 20-mF capacitor. What is the impedance at 1000 Hz?kuwm(j yo; b):-)vids. qvqx2

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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 at 1.0 kHz for a t pio. /pifz,s7otaloi7.,z/ppsfi impedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacinq h:5rlj q3a6 /)bfemtor at 1.0 kHz for a phase angl3bqjnl) :5 q6rhfma/ ee 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 ref684nrg zlhpe;0q7b* 3omzza sistor at 1.0 kHz for a total impedance of 45 Wzhqel ;m npz8ag* 7f340zor6b?

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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 Hm/keha3,yu19vkm wlh7/h: (dhe elg/z. What is the phase ang ekwglhd1ha hve// , m(m37uyl9: keh/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 ancatx39v)aca- az 8d6sd 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in sa- 938cs6 caa)xvt zdaeries?

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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 )2ih)4bdrxw8i kx m: ecapacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 2wr)4xiimd x kh)b8 e: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 capacitot.a *oz8sbc)zb,.fi /n v-xjl tm1q t5r of capacitive reactance 30 W, and an inductor of induct )bj lxmt. oazq*5z.isct/,1vfn-8 tbive 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 containing a 50-W resistor, a w.uwt ,fmut5h9 yirmzw3 8olg9a)- 1t10-mF capacitor, and a 0.45-H inductor, when mi5)utt83 fzg, wh9y wu9. 1wa-mrltoconnected 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 c23k zrem sokz f7,qpcg0v65*series with a 500-W resistor for a phase angle ozgqep562 ofrv 3, zckk* cs07mf $40^{\circ}$ 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)jzp p5sy.r 3p.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximumj)yzp3 p5srp. power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 Wp d9i(w3y gt ypih86e9 resistance, 15.0 W inductive reactance, and 10.0 W cap(hwe89t pp gy9i36i ydacitive 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 aczkldt ;sw x:8)gp,,dn AC circuit 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 n bg7) ozly ,w,;(+ntawjak;f 60 W and a resistance of 30 W. What is the power fano tzl;)j(,gfwawab, +ny 7k;ctor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W resistor, a0hfp r5kkpn1rj0,o ) 1ao+nuf 10-mF capacitor, and a 0.45-H inductor, when c 1kkfopa+u1f hnjror5)n 00 p,onnected 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 frequency of a 1.0-mF capacitor and a 15-mH coil 9.; u*a gn h8v6jfrurxin series?rxv jr9u*u;f hnga86.

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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 g3(kjtcn8 * vgfor a resonant frequency of8jngg3*(ctk v 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-yvp3 :x7-wxll jhz8; 15mg 8q jsjl1llmH inductor for a resonant frequency of 10- sq lllhgplxw7;vz885j1j 1y xm:jl300 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 witdyj 77fm;w:1a nhvc 78 8rprz x,lrr5dh a 30-W resistor and a 40-mH coil if the resonant frequency lj7n5r 7: d hma;7f,8yrxrwpdz1r v c8of the circuit is to be 1000 Hz?

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