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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 9ev(3hc0 ynrpur j5-aare units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction staawg02v l odms62 g0xe:tes 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 loopswbe j(s*n,c x asw8x ih.7+:nn of wire in a coil produces what kind of change on the inducex *.+ejnsxnns, w7bciaw:h (8 d $emf$, 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 fj-0jk q/x/m8 wq8 rgfjov (n)qr j4wj.ield through a loop of wire produces what kind of change on the induced v48 (qrnrjw8xj mk/j.qo ) 0fjq/jg w-$emf$, assuming all other factors remain constant?

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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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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 of change on qjogaa,0ii t :3c4uz- the inducqa0i3toc4agi -zj ,u:ed $emf$, 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 frovg2h;e nyf i,9yz2, vsm a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's lape4::wqgpbd9kv.f rm .9 f ox(w, the direction of an induced current in a conductor will be that w:o r mpw. (q:9ed.gp4vfxfkb 9hich tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies fzapktjjdh,kk*ir hv), 8u 379. wne7c lat on a horizontal table. A bar magnet is held above its center with its north po79np)d.8zaehkic,ktjj u3v ,w k h*r7le pointing 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+ e7mz18cr7pxzee ) se2r o2zo a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the 771om+e2eer) oczz8 e zsxr 2pfalling 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 th u: qw*etd2:zuh/ nj0se magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed fr :wd junu0*hzset2:/qom above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the /a0as3ltkub 9/ dy*x3p(mtm c k7a:jrmagnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what k* pa/0l37actsm: y/auxjb9 (trd3km 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 d .qq oo ,bq 0rhbnmxl9 0+f7-xbeu-/ya horizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, whaef-bq 0ooy-7 ql u0+q.mnbxd9r/bxh ,t 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 et6v xag fe4o;vl-6fn+ver-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the t+6 v ; fola4efvxgn-6induced 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 7yxb * )w+nracwire with the north pole entering first. As ) xy+c rbwna7*the north pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about ac: m.al(vz h9an axis whose direction can be varied. In a region where a za .l mh9c(a:vuniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant e )sf *l6,,hyjrt,lvxangular speed about an axis whose direction can be varied. In a region,lyf6 helt,js*,)xv r where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be 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.bg y8c(liy)y,s1d/7t.s g 7 a mgzfly4
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that an 1m 0 buily)xt5$emf$ 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 f(fj x3 cn53 c4gnjl*lzield. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moveml/0 k(p2a cvhy4,mdbeqy)z.d northward at constant velocity through a magnetic f ,qh ylv)zk p/ybdm(a.4ec2m 0ield 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 constantvx c7v px3r-fu35em q fj6e*h9 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 trai ;f xg.y3nq)unsforms

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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 eacj4/m)qgo owa rh.;77f:xpfih2 0n eqo h second. The frequency of the m; opfq4r 77hiqeh)jw0gn2f/oax. o : $emf$ 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 usek*paz5d0jl e8d 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 devicxb;cqn bo7 akm.ug) 2ec;d2+boq d:e(e that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, ifoe -yxa78j(k l the secondary coil contains more loops than the primary coil then i axy 7(-j8oeklt is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secondar 3+6uhq hb9*ra 9msfdxy coil then 9 *xhh+asu69d3rmbqf it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, thpv 4gb ;n vgof(y29nn;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 resonant ciba -cs,)x im)bb-q+cyrcuit,

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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 of con4fj +vjdz bojb+;v,a6stant terminal voltage. At the moment contact is made with the batte;,v6 j babdvfjz 4+o+jry, 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 z(rpon2z-( og connected in series to an ideal battery of constant terminal z(pz-2o og(n rvoltage. 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 rercl:a nw 19:bc6a1 kjtsistance 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 inductaneejec*5 mq80*xf k 9lace 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 resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to w3iio/yn2)uza 0kn k*-4sp uia battery. The time constant for the circuit represents the time op s0 i4 -kyaknu)23inw *z/uirequired 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 inghe sd7tjd5/)jw z7 (vductor are connected in series to a battery. The battery is suddenly removed from the circuit. Tvddtes(7z)gjjw/h7 5he time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units exb t *:/ogr/wnocept:

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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 -o z0e ; 0jm.nzn6u+uhe(v pdecircuit, 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 pl* swewhl-96 dower supply. In this circuit, the current 6w 9l-ew*lshd

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when th qmtg0u6gd8b* e frequency is tq80t m *dbu6ggripled?

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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 acrossge9l:orp l8 ll o87)a*.v iyfd an inductor is doubled, the inductive redplr ye8v f)oloai*8 l:9.g7lactance 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 ACm*k f87h ea 8s/zjmb4 rvn/rl) voltage across an inductor approaches zero, the inductive reactance of that coil8rljr84/ haem7 fzb*ks /)nvm

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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 supply7+ h il xkrf662 m6 4ml57pjgrrikj4sj. In this circuit, the curreh4jm6imfgj 6prks i 77x +42jl5 kr6rlnt

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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 whu bc/(crn)* nk,3q tnden the frequency is tnu)n r, qtn*dbck/(c3 ripled?

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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 a, 5yumb8 euppf. sa5aa 34zl/xcross a capacitor approaches zero, the capacitive r,.5u 8pea5z 3aflx y/bs4pmaueactance 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 volt-5cks w.;rb atages of the inductor and capacitor in a r wb-catk.s5;RLC 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 RL6 dr3ev(u05tse 0/ktqthe r/lC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit inf )r . nb7sju ..ou60ta9ssetmcreases if R increases. When is this statement .tuub nts0f.msoej7rs9 ) 6a. 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 increases oxp yy3*oqg0+ 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 circ.vav kzedu9 a(38m)emuit. 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 capacitance bo6 ;od6l rkf(h2 etdh7 p6 jc,ansr:nr*th double in an LRC series circuit, the resonarl cd ,andrph 7*26kt 6n6hesof(r: ;jnt 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 i /ecn0 ppku,k-s driven 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 RLC cio+r,,tnl5c 1(9yttihff d; t drcuit 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 d3o,qmxt (,fp m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loopx(f p, m,3tqdo 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 cj3z;rrd 6umuuu*3m+magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector cju +6ud3muzu;r 3*mrare 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 radiujw9tnl3g0r al7 2gzh;7 :mfacs 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the maal7 lgjhwm g3n;f:02 zacr79t gnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable singlhjl+ps5 43v uie loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes fro9(: 1:uc8jo21 wyq( vjnlqddgsn5q ce m $4.0 \times 10^{-5} \; Wb$ 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 cmelm. / zy+s4io. A uniform magnetic field is applied perpendicular e i/ lz+yom4s.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 areat ouas4 l 5i2c/qfi,q5 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 aream2qqd 3 cykc aru*g(3, $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at ksy ptps 0tbov v6 2u+:7d;6mtz0v.mu a location where the downward componenttksvt0v +o:s7t6p2 yum. m6;ub0zvpd of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angular vewhqrgle91:uh j 5j1t-an/ si0 locity of 2.0 rad/s about a vertical axis throughuljgrahw1ins j15/-e: 9tq0h 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 looj+w1fm6 fmgbi2zm0v5ps and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 ty9z:8gmeu 6q* vg9ik purns 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 loops on its armature. Each loop is 12v.s(kh wx gw xv2,+o2b cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is pe2+v2kgv.w xosxh , w(brpendicular 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/dowb rk ) rot/z:tf66m94 cqz 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 constructathp.ys+5 hdd*r 53 cl a simple AC generator with an output of 12 V maxim+ 5pscr*ltydhd a53h.um when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generbw*v t d *lufufd94n/2ator 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 of 6.00 W. The moto(( (agof4p8a/3w pwgebu/0 mtk egdv /r 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 resistancw7k4ghj c1hfy0pnh1 c j2+r1t e of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a bach wtk47hj+y021gp cf r j11hnck $emf$ 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 cong tiib)l 7: nvsdoo ct,+b/1i8nected to a 24-V power supply. The operating current is 1.0 A. What io7tsi+tii 8,db ) vno1 cgbl:/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 connected to a 24-Vcmyasbh4 ,1j:lab o9mv) 7bl2 power supply. The operating current is 1.0 b9l7l ,1bsj:o)bhvam4 ym2ac 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 W is connected to a 24-V power supl-3 smtg, fk; y/+u92pnwmft vply. The operating current is 1.0 A at full speed. What is t+9 mv-gk23wlnff t /um,pys; the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltage omwp;*c ek4m+) fp6 bsif $120 \; V$ 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 //w7nekbyc +vx0cxn8flow in the secondary. How many turns are in the second/ n/x k7wvx8eb0cc+y nary?

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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 n(lwy02lkmy+f 1 (api are necessary in a 110-V primary if the 24-V secondary has 100 turns 021+wai( (yfkylp mnl?

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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 prpwyc8 qy )c;bg(ll9 :pimary coil and a 2000-turn secondary coil. If the current q8p ; :yyl9 c(wbc)gplin 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 ke*bw2k bc;a1a z3s;f transformer. Assuming 100% efficiency, how many amps at 24 V caba3w *ezb2; c1k;fkasn 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 transformer provides 7500 V at 10.0 mA. The+ /u(3znkcbnoc9 x f8m primary c+8b z9onu/ f3cmkxnc(oil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its seconcg1 *u gx5)p xa7rfz45g)ifjp dary coil. If 120 V at 2.0 A is applied to thec 5zf)rgp) 7gg1ux*x pi54aj f 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 prl w j5kzk mwh9jt(w/*lg(k7, gimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current ,k wkt*7/ mj5wkwgz j9l(g(hl is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tur dm0el, (e,nxg) i/4gz,bw/etion q7 6kzh/emns. If the input curr,engz i 4i/mk znexohwd(m/,e /g76b) e,tql0 ent 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:vh3j3cd0ne3;d tue.yprg (tp lu8s- and 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 bs3yde tv(pu-0u3pc:3l. ne ;8h d jtrge

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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 hrd4z*6yd9s w u;)sz5jmy9 lga as 200 turns. If the power input to the primary is 100 W, we can expect the power output of the ;z6 j 9duamw)rgzsyy* 95ds4lsecondary 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 nsi+l: yyx+ +l)y ypaf. 76g )fgbdcq0is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the numbe lngy y))6giysy+:a 7xdf+f.q+cpl0 br 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 V8 c,ow azens9( hm1fzi* col8sb.-h d:. 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 transw9 -na1*(c ibf8 zcdlhs,z.:ohmoe8s mission 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 currentgay30j f f8fo4k e7tf-tb( 7*,avv bqv 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 pow8 ft* ebfvkyfjqfab(,7vo0-va34 7g ter 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 km long has a tota86 dv. x5p1 qm(hebytal 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 transformem y8t(v5xb61qaphd.er 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 resistance of 0.60 W. A genehi/ ny .mkly 994-mjnu3x7yserator 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 is lost when the 9lysy-ix n.9u /4 nm7em3 khjytransformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less powuahue ky h1(j2.to/f7er would be lost if the power wef(7ju o/h1ayth 2uek. re transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a l*ru(: end i8gzh49usde (ezm /ine with resistance of 0.60 W. To whateeei m4g(s89d(zhr d* /:uznu voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is storbvld,h+xs ,s7ed in the coil's magnetic ldx7+,,sv shb field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor4i kscu98l wc0. What is thikc94 su80wcl is circuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage ivxkh,x mw8it0p g -a:cah6v 84s 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 peake +ze-ma:q :z2u4 wyvf 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 outlea10 ,y.chmm;csgx os ;t. What is the resistance of the lamp?x;cm;.ssh a y01,com g

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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 ja + nz7ha20kysupply. What is the peak current through the resiyh ja7k2 a0+nzstor?

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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 poweplt 6 h:h5,eerr dissipated in the resist heph5, le6t:ror?

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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 d5d hbr( bhs:hud.m,33g t/wr50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resm p3 ua81yh.yyistor 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 .rm5 q/vdk;gxresistor 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 induc7 6.rda /okmg0 2x*eroz2wcev tor 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 at 1000 H.gjb; j2z+sx fz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W o vv;3 8,xbemufbosbf( mw m.e5d.dt-( f 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 rh :z(clz (imh.7s2myseactance 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 12huo/gi1c 0z56xk izopzv .1 a-0 V AC at a frequency of 20 kHz is applio1 5-ikpcgz. o6 zuxa/z1v0ihed 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-c0a bzi5:x i6ymH 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 2musv/ezs76hreactance 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*;b-dn/wwqe2 /o;bgyb e ygh- 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-mFkdseshp :8+; e 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 capaci 4u-ilm9yo b/;lw-f*j dlrns 8 5nen6ntive reactance of a 0.010-mF capacitor be 100 Wnrdlew-;l8*m54n/9ybf oniun6 l sj-?

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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 at 1( euok)6ygl: qs(i4hd000 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..hm:f p dx6o:c0 W inductive reactance, anc .dfo x:mp:h6d 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 if +fv/*33 afwngxb.:mz -s hdz-yzq ey8a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are cf -ya* mv zy/b83ezz3q+hs-:fdg n. xwonnected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100;f, o c ak--uw wbpz0g22lpfo2-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serwpawub0kf,gz- fpo; -2 c22loies?

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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 ind k06llu, (0nbrcx/k (smg loj0uctor, what is the impedance at 10/ujb0g,0cn(0lrskom l6 xkl( 00 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 iskwj:jw7 ;-yl*cju *q uh3k su6 connected in series with a 20-mH inductor, what is the phase angle at 1003ywuj:s- k7k ucj ** luhq6w;j0 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 serf no)p(o(/g5 vevknx+ ies circuit with a 20-mH coil and 1.0-mF capacitor for a total impevoe)+p/ fkng vo (xn(5dance 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 capa,jl(/qku . t,(eiao34ig h( .usori ufcitances is needed in series with a 100-W resistor and 1(uu/j3(k q a,io ls.,4grfoe(u. itih5-mH coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must p3tn).o; u5 q,j*1183kgmih cvwlgwtbcqat( be put in series with a 450-mH inductor at 5000 Hz for a total impedance)1 pwnh .cli* q35,tmt3v8ojt;qa(g k1wguc b of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW rwq*f(slt8c cc60,6) :iel kftrn gx8nesistor at 1.0-MHz for a total nks06tei*8wr)cl xc 6q8:,f(ntglfc impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is qu2 1sh2bhr0 rthe impedance at 1000 rqh0 rb1hu22sHz?

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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-nf) w7f:+fgsvmF capacitor at 1.0 kHz for a total impe w7+sg)vfn f:fdance 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 serqkhh8 h2 ru.r1ies with a 10-mF capacitor at 1.0 kHz for a phase an1h8rku.h2 hrqgle 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 (7k. c/qnj/n bzzyc7 xgb/ ,xjwith a 30-W resistor at 1.0 kHz for a total impec7bnzj /,/7z/j kq ybc .(ngxxdance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is tlzhx-zw 2g:+c he phase an+h:-zwl zg cx2gle?

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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 coilm:k vtha-re(62 y e:uw, and 1.0-mF capacitor are connected6h(mawtku eyv2r e:- : 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 resistor, a 10.0-mF capacit: .g 5rgl ls33hnr)i*4w iuky:a jn(vror, and a 0.rgj4g 3nh 5*r :i3kllv )yiuans(. rw:350-H inductor. The circuit is connected 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 capaciti6y h (qx0f*r0a,rchkpve reactance 30 W, and an inductor of inductive rek hpry,0f(a xqr*6h0c actance 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 anglerrcl 5-g*/w0qmi faj3/utd w9ji.8 t s for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power suppjlw0rm9i5. ju/ ri a-* /qsd8tg3fct wly?

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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 hfk je r,aypttmr8+2; /zz;a 1in series with a 500-W resistor for a phase angle of kj ;82;r/aze ty+tpzm , 1arfh$40^{\circ}$ 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 = 10.0n8 5.t:- ka ewxps2lb/i zes0e mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving sourps:nw t-e8 s./z ea x0ie5l2kbce?

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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 wr; o zefl jbc8c+qw,:5ith 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a,zb;5q c rel+fc :8jow 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an *txwg,q db7 j.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 60 W and a resistaid7zw i63i7 t xvwna*7nce of 30 W. What is thidtz3nav77iw6 wix7 * e power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a6b)e bdqcw-3exnb;0 f 50-W resistor, a 10-mF ccbw- 6) b0x 3ebfne;dqapacitor, 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 tlb 2 *0ap6fjnfrequency of a 1.0-mF capacitor and a 15-mH coil in series?6 *l0ajn 2bpft

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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 for1,pit ; o6bg a7vr4cfzv *k(pc a resonant frequency vrgvp6o;cazib( * ct74p,f1 kof 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 cpwxh1n ssdrx-5s* rl -r7:p:-mH inductor for a resonant frequpc7r:- 5s rxdl1-* nprsswhx:ency of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a xnrbvqn0 7,r940-mH coil if the resonant frequency of the circuit is to be 100r9x0bqrn7n v, 0 Hz?

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