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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 mag+ajidd:k hct)60 uulre:a .o,netic 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 +g1i3qhwtb 2mcb 0l(nstates 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 cjg9 y ,qjgh .(x)vqwh0 v9w+jdf-oxu 2hange on the in .9fdqj0( xxwv -j9+u ,whghgov)yqj2duced $emf$, 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 ue kz 5hc/:v8fuku gzd9+r(t.loop of wire produces what kind of chan5 k/8 k+guhfeuv(uz dtc9.z r:ge 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 wirewlj-xoz9g: r2qag 4v-*qbsb * produces what kind of change on the induceb q-49r :jwxa- soqlgg zb*v*2d $emf$, 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 field anorr-kd7 0 zthk:-f a+vx5voc4gv85o c $emf$ 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 dirgmi* 8 mp84g jj70fleaection of an induced current in a conductor will be that which tenig m8gepj07jamf *84l ds 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 bar magnet is he qlh/ wo,) ck f(ss40loh68qrqld above its center with its north pole pointrq,h 6 h8fs)qowsl0k4(o/lcqing down. The 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 ho+ )ftq)4kq) papm,;+e sgo bnorizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approachesmo +o afskpeg)+ ;qn)bt pq,)4 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 regionaw 0a 23xt yfx:dde(:n where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coi0t(3ax y: 2axwf nd:edl 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 magnet. cgl,:8tk ee4mo:-p + myhtutic field vector points straight uplh:mpk.c yt-ee 4t8+mt:u,go. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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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 where the g5 *r9wf-,1i. le+eldz gzsvv magnetic field points s5 .wgged+vf-i,l9r1* slz z evtraight down. The magnetic field 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 ever-increasing c 4kjzr+( cdif;urrent northward. Two ccd frk; 4ij+(zoils 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 first. A0 v6se *15jv5el hhnfzv*uz l,s the north pole *jz uhh*n e5l z 6f0evvsvl,51enters 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 co ;.aicshbd 61ge g*l.ai8 g)e/ gezhm,nstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation ih egi1ie.aa,8egc6s*hmg). d;l/bzg f 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 about vbz:+)xq 1o orx2r4af xpbv8( an axis whose direction can be varied. In a region where a uniform magnetic field points straiv+ b rx8f b:o1q4o2zpa( rxv)xght 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.9z*l;t4 (mptubt e z n1i:csjrka7*t+
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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 an2+zf/eo qq fq6 $emf$ 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 fie g,fnfbqz(s8 g j(qqp vi6x317ld. 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 t njertx; v/x.f5) jl0yhe east-west direction) is moved northward at constant velocity thy5;e0) r t.xjljvx/nfrough 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 an92rdojfz37w 7e0 kkbz6g0ujjgular 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 transformu(09o 37i n ayf2avh+zp c:iraat8mb0s

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rot p:ab* 5iw g7(kjdu9pyates through 60 revolutions each second. The frequency of th :7y*udbp(jgp ai5kw9 e $emf$ 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 z+ 54k1xcs6qy/f8be3y3 f+ rzr e uaokused 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 tha naet4ss)tr f:7t- an2t

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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 secondary3m o+hiz1e1ukc:jj5 t coil contains more loops than the primary coil then it m eoz+1u j153cji:khtis 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 lz.*pp 2kpmb59 lh3no coops than the secondary coil then ilmb.* 5z n2kpo h9pc3pt is a

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, th9 ) da3xhcdm+y -ivus7 bm0e9o(tsgt:e power 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 resonag uo)0j9e,5kl,btupksli(if k /( io5nt circuit,

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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 indb6p/ gey ui(t tuiy,4+ 9ixfz6uctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the batter 9g,+6ie/fu4t(uipxyy tz6bi y, the voltage across the resistor is

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an indyi.sy :cv5 mx7v/p u.kuctor are connected in series to an ideal battery of constant terminal voltage. At the moment cc my.xs i7.5p:ykuv/vontact 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 wit -wwdwdy,c 2ovr)(di0h inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and , 3bbyh3d3v0l)oryri 7w .jdf resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the 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 ci3(txlf li , hfqu1;h7onnected in series to a battery. The time constant for the circuit represents the time required for the c(x1if l t hfl7,iq;h3uurrent 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 battenv gr0k(ovm+ ,ry. The battery is suddenly removed from the circuit. The time constant for of the circuit repres+ ( mon,vgvkr0ents 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 unitswz-/ c -6vnjcj 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 circui8w3 t7nblknqzp -9i) nt, 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 anw..iy8 onw(w( jx;nsv AC power supply. In this circuit, the current.woi(xw;v.n8j s(nw y

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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 ch 4onjt /a:/b,whw9 nnvanges by what factor when the frequency is tripl,an: bon9n /j4vthw/wed?

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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, thegf1si o kelp*-lf 9w:: inductive reactanceg fwo1ils:e *fl -k:p9 of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the 01tq+ejv3u rjhy9*(tf jkc4t8 pkq,aAC voltage across an inductor approaches zero, the inductive reactance of t eavtucyk+4(*kq,j qtfj91rpt308h j 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 1ibkuf5w 6ut6hiv r. ;power supply. In this circuit, the curre k1b66 tifhuiv.w;u5rnt

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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 b 2:gfy ;d)pvpsy what factor when the frequency is tri:p;p)syd fg2vpled?

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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 acyenzeln8f i+x 7mw. .*ross a capacitor approaches zero, the capacitive reactancilw8y.xfnme . 7e*zn+ e 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 id6/vf v76,fs j1xpmx* zg/ yopnductor and capacitor in a RLCgpzpj7,1m6 xvy/f/ *d sf6 xvo 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 an RLC circuit noy3*t. lo80xu cvc9bis 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 jycsx9/ l 7l:uincreases if R increases. When is this statemeljsy:xc7l/u9 nt 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 increas(bl:/r feiv :alz (pa ei.-+ot yl/y6ses 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 circui cici c2r y.7iq0gp+*ht. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the mf) 1katsw qi2bk5x7dwvgk + 34g5 :olcapacitance both double in an LRC series circuit, the resw)g5tk1m:2+ilo3ak f 5d4qx gsw b v7konant 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 dycdxt3y 4l/4cxlj0 js .rc28jww )ks*riven by 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 RL /abt1vg3b w7n/c tn2 ;x cald--kw6alC 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 roe 8sucmgv 5m:)jq9( v arqny76tating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the) aqu9m:rg(mc7ev 8qv jn56sy 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 0.7siynjo bmz*uu96-qs:2 hxt610 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 fielu6z iqus*ysm6b nt9jh-2 xo7:d 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 fbnorx( lgx34 p b9xf) ptas)98ield of 0.20 T. Find the magnetic flux through p8tx )ox (g39 4al)b 9sfnxrpbthe 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 adjustablq-)*zqbyh jfzabrfzv+/) o:,e 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 coi-qv6yv5/nsy1bzsk o 8l 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 u-z )u, vgpah y+ms(n0with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value ofu)ymas -upzng(,h+0v 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 a:xj.7+ k kz: nvf:p fq5.wsmtmrea 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 areaw9-;dhjm jt ja r7r0a+ $0.20 \; m^{2}$ 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 i4mugoi :6gb4 fye(4p60 m flies horizontally at a location where the downward compoifi 6o(gem :4gup4yb4nent of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotab1b2cnfe 8npxlm,q .*tes at a constant angular velocity of 2.0 rad/s about a vertical axis through oneebnn8,m. l 1 qxfcb*2p 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-se tg)pm9j c);d 6azl)zectional 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 consisi5dj2obdm ;i -ts 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 g+dxn0, tgf5 g80 rectangular loops on its armature. Each loop is 12 cm long g+x 0fd,5ng tgand 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 10is tpxc 0u0b,u+0ebt10 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 constru842ovkm2o 3si 1wmna nct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of k1sm m232n8noio avw40.050 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 gen*lr5eu f icb u 1rsyef1rv3k583djl 6t3v6 yi9erator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance ojn9/0(ukjof hc-t4 u kf 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 resdg/2 p tgqt(te0g9mx1istance of 6.00 W. The motor operates on 120 V AC, 0gdgx9 /(p1gqt m e2ttand 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 connectedk/3i i5-u-jzgz0anni to a 24-V power supply. The opea iz3 05n-kng/uz i-ijrating current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is l/ tellr:3:xf connected to a 24-V power supply. The operating cx/3: :e fltrllurrent 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 Wsx+w -*jt1 g:rd7bfv r is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the b+1gs7 *r j:bv fxtwdr-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 r 1 phw5l)e5f mwe/cw3sfbi30heduce 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-turlh5gsy 4v- zp db v(lbc4k4u1k47uzs,n primary of a transformer causes 14 A to flow in the secondary. How many turns are in t,yhllsuk(7 svd- z4c4kz14 u4v p bbg5he 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 in a 110-V primary if the 24-V ib x(2ksiqh/ 9secondary hasxibks9i qh /(2 100 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 primary 5b p5 aqc,x0+ru/mabunxjq /e3w; sj;coil and a 2000-turn secondary coil. If the current in the secondary is 3.0/rq u3b+5jax/qaw5u,0 spx mjc b;;en 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 189d8z6o*s3l jl y1gvyp rf(saxt p o/200% efficiency, how many amps at 24 V can flow in the spa8 xt*/os 1zpyvd3 o 8flsyjl(g 2r96econdary?

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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 sig(z9x3:ol eduk m0fn vry 96(lan transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary d(y 0lo 3nu 9flramxzvedk96( :raw?

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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 turf x(jyse(qw73ns on its secondary coil. If 120 V at 2.0 A is applied to the primx(w7 sj(yef 3qary, 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 turns on i57by)z5jm*drffm3:6g j+ qpkg8c rql ts secondary coil. If 120 V at 2.0 A is applied to the primary, what current is pre+ 3gqj6d )g7krq*yj ffm 5zbm c:r8lp5sent 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 secondasm-:-j5be sknry has 200 turns. If the input current at the primary is 100 A, we can km-bnsej-: 5sexpect 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. y3y7h s c onj4n7/(h,os i gyfd7fvm)2wor *b2 If the input voltage to the primary is 1 hdws7vs mh2y2of4)yrfnogjyo77n3ic( */,b00 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 an6gp+(3i wxe hyd its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (negl 63g(ew+hpyx iecting 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 strub0ha645 r6 upbuc99 j3bwaaepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary jara53u4 uacu0 w9 br9 6pbhb6has 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 curq,*h)nv4wl6 fb 4bv gtrent 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 gt ,b*vvfqn bw4h64l)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 al-q44gzt ;xw;gk41c q0pcl p 60 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and t c w4;4 g-t;xp1kla 0gpqclz4qransmitted through 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 50 m 01.g8 ki6(gmkze q7qssck(jkm 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 heatingsg8k6.0 q (17mikzesjcqm( kg 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 resistancrs0* ; 1xfc4)1kojxkm wez;lje of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heaj kc1zf;1j*o rk 4;wms x0)xelting 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 100z y 36a1tpa:ru0 V. How much less power would be lost if the power were transmitted atz1r a6yap 3tu: 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. atfkrw3g; f nr -)/6mlIt 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 exceed 0.010% of the km-;twf gr3)fl ar/n 6original 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 th4fy qv/4a;bnj62 z utme coil'4tabz fv;m qny 4j2/6us 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 resiv:wzl4nthf 5r m/h.*2 2 eylsgstor and an 18-H inductor. What is this circuit's tim hy ts:2 5e.4n wv*rhglzm2/lfe constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 1js599gdr5fxbk7ub q2* a0if cgl1 v n520 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. Weg3wi)by0mp8bm77d x hat 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 outlnz0r ;wegk/ c+et. What is the resistance of the la z0ewc+;gk/rnmp?

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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 c)afg 1hes2dtsm 347r xonnected to a 120-V ac power supply. What is the peak current through the resistad2)3 s17txr 4hesf gmor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the power6 vs*h:1vvy.2gylwl y dissipated in the resyvw2y6ygvl:v* .1 lsh istor?

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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 r g7l6.qz,bflresistor 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 1ie:q7esz 9+6z ecy90mzu ukoresistor 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 resist4ohk4 i1u)uv/3ybaq cor 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 kjo wq j:ez10dmiq 83ek*;vg3at 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 at 100(f0e0zr/6w6zyg ap 4cr0n nu8 pg6 zab0 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 -zlj((pf rh*u(9bn ec 7ohsf-.w(m i q14.0-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 necesvf.ed.2inruyr n49 6psary for 157 W of inductive 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 whexk6b5*2 ilsman 120 V AC at a frequency of 20 kHz is appli5xs*lk b6ia2 med 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 x kc vm3,v9wf8to 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 czg.d0x1x( tu4cyd n4 11 zwagjapacitor 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 Wcy;ooy8 le(e) of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance ofg f3+dk1 9 dls/z7zmjv 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 wil-( if*b wx(onll the capacitive reactance of a 0.010-mF capacitor be 100 W? l( fb*ioxn-(w

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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-mcc-74nbdelrp/ er c2 5vczv20F 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 seriqsd) m.w a 27poe38gypi.lx8ces circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacigx 3lm. )c pdqsayepi8o28 w.7tive 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 req:/mwg.c/g e;hschm ;sistor, 20-mH coil, and 1.0-mF capacito;/wqc.c/ mgh:g hms;er 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 15fd5i33qx,es , wm x(gj00 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in e3xig5,s(,fwm xq dj3series?

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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 connea+5kpom: d mf2(/du1 q vfaf5rcted in series with a 20-mH inductor, what is the impedance at:md fo25/ fq1 u5 pv+af(madrk 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 wit 4gmab97 )vxyfh a 20-mH inductor, what is the phfg97 vmy x4)baase 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+*w+ ;kmpt onhy6y 8ghoil and 1.0-mF capacg h k68tymyh; +nwp+*oitor for a 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 capacitances2 y kca2-2lcgybavm 52 is needed in series with a 100-W resistor and 15-mH coil to get ag2mcacavb - 2ly2k25y 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 in series with a 450-mH inductor at 5007xmqw,3 m j4 0tivf+2u yeray (os9g/x0 Hz for a total impedance of 40000 Wxoxqweu fg,y0 v3/j42 (i+a smryt9m7 ?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for alv v*u3 hyp;o/ti7a4po8b nrb32po3 t total impedanvabvo*ttu/2o 4;38 prphpn yio7b33l ce 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 e ja+p35.)keu 4 smpmlwith a 20-mF capacitor. What is the impedance at 1000 Hz?ma 3+ lme4spku.jep 5)

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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 jy.hs 5eyco7 z/4jup71.0 kHz for a total impedance of 45 Wjp.oecj/yshu4 z775 y?

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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 bjge. wzhm06r4z l8l 2in series with a 10-mF capacitor at 1.0 kHz for a phas h8w.0 2gzbm l4rlz6jee 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 4wfewq6fk/ j6g08njp in series with a 30-W resistor at 1.0 kHz for a total impedance o fjf8ek w4 6w/p6nj0qgf 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 cr1r83,ql0pauov 9 gxa 100-mF capacitor at 120 Hz. What is the phase a0q3v,c8 l1rug x o9arpngle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, anuli5x .6rdbi ;d 1.0-mF ciur l6d.;5 bixapacitor 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 co) 1nerlp :w1vbwvol+lve7o 89nsists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is con :91vwve+o ll onp)8l7wb1revnected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactans-yn.rwyax1 8kf)) t bce 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. Wha .1 bs)kr-wny8ft )xyat 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 resistxhkp2 wmx3)n a)ql lq9(4vf7 uor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supplyafl4u)p79qxl(k m q2)x vn3hw?

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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 for ifmz0uml gvbt m u.b9:3cc+3/a phase angle o:bulcu. mf g3bt9v z+m/3im0c f $40^{\circ}$ 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 has5d 24+a5. fl u +rctixp-grsds R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven 4+gs5lfi srru p.a-dcx5+ t 2din order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resista3sib yn)8j lal2xf- jen8,:imo p; :nhnce, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a xf8h :moll-jbyp;n3 8aeijin sn, :)2120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit isu)c 9jnf/ eae7v4c 7 88hhxcqy $63^{\circ}$. 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 hasy7gz4ws 1i/bvccpp3: . u 2oq;1jv pks an impedance of 60 W and a resistance of 30 W. What is t j:. iv3gp1cypsc2wz/ q 47vps u1bk;ohe 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 factorzmzi)t )/ a:)0 yfdxtdyg0ch/ for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H m: /dait/xzh)00 )yztc fdg)y 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 frequency of a 1.0-v-:kkao r9 (udq;b,o,*dped;zfxl z2mF capacitor and a 15-mH coil in series?z:o2 ,b;e*(a;ddkdl- z,k 9 oqvrxufp

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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: jm8z-e jcr*z for a resonant frequenzj: m- ercz*j8cy of 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 l42pdmm9jga )b7c5g enm.+ kbseries with a 3.7-mH inductor for a resonant frequency of 1000 lacm+dnkgje9b). 4mg27p b5m 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 sx alr ynrk5 xeg0 wg+/hu5 x7a.p0f91a 30-W resistor and a 40-mH coil if the resonant frequesx7fxu0ry lh5 wa 5kgn/g erp.1x9 +0ancy of the circuit is to be 1000 Hz?

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