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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 magnyj6hqu m8ds+sye-j4 4h +8ydaetic 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 induwo7b1z: vx3 ysv6 9ejuh8g-qbction states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what5c6hz-/0, 24kcdq2 t jshz qccdt1b ij kind of change on the indu chdhb ,/cd -0q tcsj2ctkz4q2516jizced $emf$, 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 2j+v/gc .-*krazzyly through a loop of wire produces what kind o*k z- v yr+2acy/gzj.lf change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wiw cdni7;/d p + 5g4p1dy9okzoh59 rxxmre produces what kind of change on the induk;dwd7xx9 5ph p9iynd4o +gz15om /rcced $emf$, 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/;3* a: ut 48sjzkbt5g fadaxg5yyv .yjs /p6f 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, t;(i qm:.dn hzvhe direction of an induced current in a conductor will be that which tends ton(h;mi v:d .zq 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 h ykwi,br)rw 22eld above its center with its north pole pointing down.r,2rbi 2wy) kw 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 flmsct3 7v+cm7gl qi hzt+/y ,f0at on 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 falling magnet induces (when viewed hm/iymt70+7tvcqlfcg 3,+sz 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 aa* n/4cordjzxafos(. ik .a+; table top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from skco ;z+4a*/j arfo an(di. .xabove, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic fielj( m0t bp5u hui1a*+ugd vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the di0mp*1(ijga btuuuh5 + rection 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 magn9ae9/nesk: uq jf*g/, sut ok7etic field points straight down. The magnetic field disappears suddenly. When viewed u es7nsf:k,uat/*9g 9joq k/e 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 carri n pdqs5qlq3,,qhcqm*3 .t0vs es an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the indu0np5,q ,sh3 dt*vqcqq3l.sm qced 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. A3zwe ,0l-9pipvgg d/s s the north pole enters the wire, the induced c3l p9p0sgg/ vz -i,dweurrent 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 an axis whosdr gm.qx42*bg4hem v-+m.bs fvaw g51ay6y- se direction can be varied. In eg6sv*hbs a.-ym.y gfa 24 d+mq5- vm 4r1bxgwa region 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 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 i6y2ijk9d0je4)v y u e*wzz8fss rotated at constant 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 if the inducj*iek wz92v fsdu y0j64ey8) zed $emf$ 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.wjw/ 7-*twjrh. x-xhh
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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 a5 ddyvwj9gou1 c. t;3jn $emf$ 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 fi .u85 ol9x .mpcrpi nvg4g5e+tc1qqg0eld. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved nwx)da)/s.ery+mt 83o xc( at sorthward at constant velocity througha s xx.t+yo/(te)c3 )dw8sarm 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 angular velo xm6uwxrk:6n- city $\omega$ 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 transforlg ruw(ki -v)02gxx v6ms

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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. Thexsc7mje5pul jqh5k t k;8(;;i frequency of the s; ;5hmpe8 k( l;jj kcu7ixtq5$emf$ 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 me;39tuxo/ x bused 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 devi*ugj8e 7 ook4hce 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, if the secondary coil contains more loops than the pri*bcyaxqp1tvq/.5hk3jt: ,pkmary coil then it is ahb t*kv:q5pajp 3,ty.1/cqxk

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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 f wp 2c4-;65jghvsies coil contains more loops than the secondary coil then it v-jwpf hsg;is625ce4is 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 power : 2hjh/kq( ; fmz/jjapinput

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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 circu9lt-qzad*3il ** w+jdhml 2 hl9rmal7it,

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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 ideyma+1kj ; 3vmral battery of constant terminalak1myv;+ mj3r voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in d,ixoq-6xp z:series to an ideal battery of constant terminal voltage. At the moment contact is made wit 6zqo :xd-ip,xh the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is conn4tonizm -opgq.) )b7be +rf 3uected 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 vo jwjp*ttxi1 /:c4;dxbc+z)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 a battery. The time xl4pkw q y:g4kbl-m-,-svqnvnq9 40wconstant fl-k0 4,4qx-pwgmvnn 49blv:wqk sq y- or 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.jkcxv ch311l)gsee2 4 The battery is sudd4h2c) 3sc1jk1v eel gxenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units excej-, vwodkf6ph++ty(n pt:

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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 wn9skz+pd:yp)7 d1q6cu ;g*ak 7npodfo p4g: this circuit, 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 toh+dxa 2eih/ )) ltr04 bowxri, an AC power supply. In this circuit, the curren2h4lbridwt0o/ihxr ,aex) +)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 cha0 z*sqz)f9qhikkk 1 v)nges by what factor when the frequencyqqv i)0kfh9)z k*sk1z is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an indu p(6-sq q9s 6+cja05g:l eujejlo(fbsctor is doubled, the inductive reactance of that in6 (bqf9s cp-jegjlqsloe +js06 :5(auductor

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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 8dn4w 8ld j*zsinductor approaches zero, the inductive reactance of thzdj n ws488dl*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 this circui iemd 81.ix5xht, the curreme1x8ii.5h xdnt

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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/, puz:r )updf an ac circuit changes by what factor when the frequep /uf,ud )r:pzncy 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 zeroz4 o 44b)m,3vh p:eakqxij k)k, the capaciz j)4:pk4ko k3mhab )iev4x,q tive reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor (m+ aro)rl6ri and capacitor in a RLC sarl rm(r+ )oi6eries 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 ab)k+g*/ y5a s rr tagrad(0si9n RLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increas.,tag kc8x6 gnes if R increases. When is this st,8ga xg6n tc.katement 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 ci5sxo uuq3)s0eer7 )g zrcuit 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 incre7xew5d+ i9qg c)tjk/bi0m m7cases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double wslsz;n*qo ..tqu.* s in an LRC series circuit, the resonant freq*qton z*sq..w; us.s luency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At resonaqcg7 71gjk w.fp2i x./hf8tywnce,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs9s7o70 dg4qxv2l5 pxn iwoj/s when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of () l5gioe el0w0.20 T. Find the magnetic flux through the loop when tlwi(e0og e)5 lhe plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 svvmh+yfdc3r25rhy4c+.2: r j-ahuz m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpe csmhua:.f 3y+dzv2rr5hjry +chv24 -ndicular.

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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 0.1.q h5j ,ww3drclt,d 5s0 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are wwq5 dr,sh ,5.jl dc3tat an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced from pum-,nq6i p/3ddcn .k$1.0 \; m^{2}$ 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 c 7jnr 3sj1/tbphanges 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. l bu*l 9fk*n+gA uniform magnen*g*kf ll9bu+tic 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 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 7cf 6; f 7jue.znn:fhyqw) +vi15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns x1m z)1n npmt5 8de/zaand area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location where t7g6) ert gs,kq8; jzof-w3xslhe downward comp3 se-k7,jxqgtw6)gs r;f ozl8onent 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 l(mrd*dy8t zx rl/x.6 di *xhj.ong rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of i.t(6*dxr.il xhxd z8*r/j dmy ts 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, q fbcywi; .;c;onaw,ctional 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 turns of ja,./9knv hy57. ize (lsa cek0*tdcq 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.fjd7vvexyx; 0g3e4 c7m-u5)de ctz j2 Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotat5; e4evxd-2fxy mz7jt g3 d0e7ucc)vjion, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of af w pv+bkn1f4. lk w*xnnl1 v07,bbn;grea $0.090 \; m^{2}$ 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 outp,h 6vpk+x7 i0d3fu+bujnnf,out 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 +j,unhnof,3+0uvxp76 dfb i kis $100 \; cm^{2}$, 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 maxts zoz3p10j ( rehvg.6imum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates oa z2gzpsf;)2s n $120 \; V$ 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 e8i gqf7j6og 9motor operates on 120 V AC, and when running at full speed it678qgi ej fgo9 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 power supply. n d1ha*kd70dqqse3 a4):g3wu kw+ve z The operating current is 1.0 A. What is thew dqa3d*d+ 7gv1ae q4)e kk:3wnz h0su 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 e6tq/)mbvh-n2gful7 m5m(ifo ep 9t5a 24-V power supply. The operating current is 1.0 A at full speelefm97i25fp65(mqgot)-e h butm v/nd. 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 interna18 g;osdon9zq829lw8 i yygvd l resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A a8w yl d8yqgov2dz1o ;8gi 9ns9t 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 transformer ikoz3y4 c45 2)afkgs1by2gc wes 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 in the seconegypxjbgtb3+m9 -bo:ox. s ;8dary. How many turns are in the secondary?.y bb 3+pjxbte:ggm-o8x s9 ;o

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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 x.w5r18 8uznj) cq ghf/hzofo 8 -wtc6110-V primary if the 24-V secondary ha 8 8fogouwxt-rchjc6w51 hf).znq/ 8zs 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 coil and a 2000-turn )gaxrnu119qr3 ;1f onchhya 9 4ajj+tsecondary coil. If the current in the secondary is ag jhj3a9h+4cro au1x1 1ny qn9 t;fr)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%7rli/tjq w3:c sj6b5 w efficiency, how many amps at 24 V can flow in the secot b/ij3ls qjc:r 6ww75ndary?

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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 prz+.nk- a o3+cxzd:;nm5k ijuzovides 7500 V at 10.0 mA. The primary coil operates on 15o:i3kd-mc ;x.z k+zjna u zn+20 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 tz 2 ioap/v z.n/z/o3ulgrq3g8urns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied 8z/angvz//li2q up3 o.or3gzto the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its secoyht5xo +ckbn* z2e4 2qndary coil.4+ xey2 b 5zkq2*ntohc 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 100 turns and its secondary has 20iuyaf+ c f;k:70 turns. If the input current at the primary is: icf +uy7f;ka 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 anjy+gsempj/d o x27s*thu*8z0c3 e 4 vmd 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 xdmhcj 7y s 0 uv34gjzs8*+p/t* oe2mebe

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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 tra*:.3i 4o4dyjhmgx dfznsformer has 100 turns and its secondary has 200 turns. If the power input to t gd*4. h 4mxzijfdoy3:he primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage g-+jd ;qcxahv4;1 kk ois usually stepped 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 secondgx+jq;k 4 hkc1 -;aovdary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is -hf3cp9k l- zrusually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Findh -fl zk9crp-3 the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is us zhx e7b/pe/sp8fl0w s2bc 0sr4nyx6) ually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the rnels 2 f8swheb0cbyx/ zp)7p/x6s04percentage 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 km long has a total resistance of 0.vdd(bsx( 9ter a*j5 n/60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a9vbrn*ae(s x/t(5 dj d 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 5t:s 6qd4 60trlv;1zhm: vommhjp 7 an80 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss dnjvdpv:8 6 raq;7tt0ml m1:h smoz6h4 ue to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less powofdjl4j( l5a 4k/tc-o er would be lost if the power were transmitted at 3000 V iclj(fo5-l / oda 4jt4knstead 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 line vnbf/*z qe/f 3ulcj 9n)kj-uo/u1ei6with 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 o *9zo-i3 /)6kufl / j 1/cnufqvjeeunbriginal 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 energyymbaq5:eq8bd1 u3e .z is stored in the coil's magneti qz:db5u e1. m38eqyabc 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 innc 3w7f:,pt d-rzf8ap0 ;ipdmductor. What is this circuit's time constantrw; :nm0ifc ,fdtppd378z-ap ?

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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 rms96d fcy :0dmuaghbc7/ voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is qe8hx1+ 1r57xcwi1oj nvn1w z the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistan 9eohhb0)1z7qay px/o-sb0a ece of the labo1-zo e 7 0qes9yx)/bh0paahmp?

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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 acgvgc4+:ph ss84o)o malcg+ n 8 power supply. What is the peak current through4o+gc48ml8o+ anh)csgvs: pg the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. Whg t(+ 4mgskt x ,ecq;y7tlrm;.at is the power dissig;7;te skc m4xgmr.,ltytq(+ pated in the 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 5f z+k,qaik 9k3t (dfma 50-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 resiqlu)i2x6 r ox 28)uw8j14s fha(svf ikstor 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-W6s 7 ca6x yj3zckf8*yz resistor 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 inductohnb,hnzo4 sud+ g6 2/tr 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 aka9psq* lc n6n 8yd0n7t 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have r)rzcvbx0m b76jr; 9t14.0 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 neces 3 -ki( :absat n-j tood,j19eoxm8lk5sary 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 when 120 V AC at a f) gzs*-mb(kj gk,ewz1)o uk1jrequency of 20 kHz is applied to kbz)jgg1 k 1e-ko)mu,w (js*zit?

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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 thro7f2t z ;8*.h yw*bngo8buq7q*vl w tp3eltyk4 ugh 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 reactaeg c xe1r4yk5 a(-id2rqh su:*nce 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 ii5.( agrpyvsgc9a, i4s needed to have 50 W 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 reayukc8asua5 ((mz 28zactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capaci/45k2 j *hzlirdtaz /cg) c0ritor be 100 W0/i *4dzkcrza)r jlg2 t5 h/ci?

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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 4kt w(hmjs qg4* w nui**txf9a).wp+u at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resisvmnsjib-ks 4 i zr* osif.; q+z47y9;atance, 15.0 W inductive reactance, and 10.0 W capacitykms; an*b94 iz-zsf r7iio.sj;4v+qive 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 njgvssqi8j k8( (x,k yz+q3g4at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connecn( +gq3j 8 kk8jgz, x4svsy(qited in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mHi:r3l chh ffy 6;7ok;n coil, and 1.0-mF capacitor are conneolknc7ihf;6h f;3ry :cted in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected qr9ie7okw1vcp;5r t/4x x p5t in series with a 20-mH inductor, what is the impedane/tcox;1ikr9p5wt rqp 45v7xce 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 *g4xc0wox. ez:zi. pyis connected in series with a 20-mH inductor, what is the phase anz*zpw .ioyce 4:.gxx 0gle 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 w-3y9lh 2e 8veihc ehr 0fk-)g(kzru: yith a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at : ehurk ghrlek09fz)evy 2y(i-ch-38 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 is needed in series with a 1 e1htfd0ov:/s 00-W resistor and 15-mH coil to get a total impedance of 110 W at 200 eto/vf: d1h0s0 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 serievc1n*0bb( tx9zla .nns with a 450-mH inductor at 5000 Hz for a total impedance of 4000z nb. a9l0bt1nv xn(c*0 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 seri0zqz*:8 z: j tmg5a*br uq,ncres with a 100-kW resistor at 1.0-MHz for a to 8m: j5:aqr* bt, rczzqgz0nu*tal 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 capacin tpq ydgs2903tor. What is the impedance29 pst03qdygn at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a tota s:d2 ju503lynw4p z+i.dpq l+ d8qyhyl imp.d4whz l8 dqq+ 03+l:sydjip5ny2 uypedance 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 sd5lyfd), / hi+yu f4oreries with a 10-mF capacitor at 1.0 kHz for a phase angle ol5fo/iy+fyr uh ) ,d4df $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is need ct0s;,vwy0 bjed in series with a 30-W resistor at 1.0 kHz for a total impedance of;bsw tj0yv0, c 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 capacib: -eip;56)spux9 :l4xl /qsi5vvqgod iu x- ftor at 120 Hz. What is the phase anglesi-dxv qq94x:oe5 pxbl/u) pug6; v5i-ifs: l ?

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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, m w.gx78,c8w b/rcyhdand 1.0-mF capaymb78h8. wg wc/dxrc,citor 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 conshe z a+ ftxgd)24c2.nbists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms zfca)x tnbg.h+2e4 d2current 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 capacis lt pdwa(2.mzkz-c/8s (1oat tive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power sourtsa m(zl (zopk8. 1swatc-2d /ce. 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 angl7z p9 lercu*88.z oqale for a series RLC circuit containing a 50-W resistor, a 10-mFza8lp*c97r .qz 8eolu capacitor, and a 0.45-H inductor, when connected 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 necessoxcb-r; xt4yt5n52dwh h8q9r ary in series with a 500-W resistor for a phase angle of54wq8ttn xb-2hyxr9o;dh cr5 $40^{\circ}$ 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 hg ts0 bkvq0kf+99xo+o as R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving sou+gs9k q9xo+b kovft00 rce?

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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 12.0zk0/ k:qlo 5kc)st le+ W resistance, 15.0 W inductive react 0lsckkqo et+ :l)z5k/ance, and 10.0 W capacitive 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 an :ozzodf /qg0s( 0 z)anAC 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 resistance od ) gi9e.z.beif 30 W. What is the power factdg. bz)e.i9 eior?

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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 re 30.y + txqcgr-*qhnuisistor, a 10-mF caucrt+q ny 0gh3.x -*qipacitor, 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 frequency of a 1. /*w 8u 22ih*ukwchq9aiimx/o0-mF capacitor and a 15-mH coil in series?*mihi*9/a22w/ uki8 xqo ucwh

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a rel9/ i2v)* /bnnknvwfmsonant frequency of 10 kv * //f)9nwlik2mnbvnHz?

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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 i gyc qls5ju(85n series with a 3.7-mH inductor for a resonant frequency of 1000 Hl85jg (scq5u yz?

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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 40j r :6i- 8o 0,cmb(i*d3ny qz2bunjtmx-mH coil if the resonant frequencyjmt 6ii2 3nm(bjdob*:cqxy r-un0z , 8 of the circuit is to be 1000 Hz?

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