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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://autodiscover.51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 80，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://autodiscover.51fly.win/test80.html  教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。
 作者: physics    总分: 142分  得分: _____________

答题人: 游客未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux exceptwcg f 3g9lb(5l

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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 4o ddc spw+/v,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 o)0m ano,sdf: sh; 3vswx2.t3ftp,k zof wire in a coil produces what kind of change on the is3 k30pdzntfo ,mh. ax)svt;o ,:s2 wfnduced $emf$, 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 throughm 0t+ xglflty;r)89+p t jdnw( a loop of wire produces what kindrwt( t+f jptdllgnym+9x80 ;) of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire p/2lf ; 2q k4-iqw8eiejnbjr l.roduces what kind of change on the inducednk2fji48l/e; q2 il. -ewrjqb $emf$, 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 magneticzrim py (1xv-q, gx8-x field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced cur4r,g0g z k svdeln/d//rent in a conductor will be that which tends to produce which of the following effects?0dzr/,d ln/4e / ggsvk

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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 flahh1xrplf3 (z + c-dr/et on a horizontal table. A bar magnet is held above its center with its north pole poinehrrxz3flc dp+h (-1/ting 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,ov78cj mzxvbqd x. *ega2)6orizontal table. A bar magnet is held above its center with its north pole pointin.mxej v) ,xda8oo67g2v*zq c bg down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in 3m bbchc9v6:j2wql k+a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from a92 hwcbb:6jc mq+l 3kvbove, 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 t8nk(3jj.o y ymop in a region where the magnetic field vector points straight (y mko.yj j83nup. 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 horizontalqd 9wqd 64gzd/ table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this co6q/qdz d 4wd9gil 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-increasin 3 p+9(fe/mhlziv; fjrg current northward. Two coils of wire v+hf 9pri l/j3ef;(zm 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 looigmb:qe5 ie9/5 fv2 pop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be5mq :i bpf/iv59eoge 2 (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 whi5+1 jeqh 3rafose direction can be varie5qja i3efhr1+d. 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 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 angu+ *p hu7bxrxdar)hgs c k 3my+(ct4+4g8xbb o1lar speed about an axis whose direction b44k g cx3+p1oar +7+xm8hb )bgrd*c(sht uxycan 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 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.kb3)xbtrfoud n rv54 wfb: 21hhk0l )nr:4mw+
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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 at66 .tufpgm8e n $emf$ 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 magxgq s4 l/yok5 +8vzt:lc.h f:hnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northward at bf xv(*ijy jxy 0nymur4m*;/5constant velocity through a magnetic field that points straight down. Make x4j y0um;x*myvfn b*(jr/i5y 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 rorra d3,bs5zw:vt7b2 za 34mlmtates at a constant 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 trk. hlovpig - 1z,*let6ansforms

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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 6 scn2: 19ov)z7 o bgt qub:m-kyp7r7ii0 revolutions each second. The frequency of the k-oiub o7z9 72svri:ytcb q1n):gm 7p $emf$ 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 us(jc/ efw0 o)orgqq9k* ed 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 devu; m17jwxer a rnt;a q)b43i.aice 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 njgcnh ei1,:.q 1eu0z coil contains more loops than the primary coil then it i,czne1:1e .qnhu ij0gs 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 loopsgaa a:hs-g 5o- ; 1ls vtcf*njal1)8hh than the secondary coil thengh;v 1: oal al -ja51g)ht8n s-fasc*h 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, the power inpt;fwuwg62 u8*aj :u r) zgug,out

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant ci/1l8ib 9xu5dri 3t ewf,:dqckrcuit,

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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 co1nm:uq u) l0 cl qw9/aqik,k5xnnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with 1xl/c k: ukl0,uqqniqw 5a9m)the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an idzh -4k reps66gh2,zh6cm+j vheal battery of constant terminal voltage mz426h,e6vs j6cg h+khzp-hr . 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 resistance R is conne6as 6vi gi/z zyty:8e2cted to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connectex-emn xm cm-6q (e.-mcd 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 seriesjn2nh6;c1 qq3 yq cq.g to a battery. The time constant for the circuit represents the time required for the curre3;jyqn . 6cnqq1cgq h2nt 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 conx38tsh1w)ky j w qsx08nected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current xy ssw jt0w81x)kq3h8to 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 samex p;:k:0m ky ehb:bjt0 units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the curreng.8gyjbz 3c g4apd8x1t

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this c bngss ;a0p/i,ircuit, the current ,n /igsaspb0;

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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 cirygoxcqu *0x* ,baml(5cuit changes by what factor when the frequency is (clb xu *o5x0gm*yq,atripled?

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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, the inducti.ud wy5lxvh/ 8ve reactance of thu5wy 8x/. vhldat 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 AC voltage across an inductor ap5(: k7n bgvtng2)c atwproaches zero, the inductive k:cnn5wggab )(2 tv t7reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, nk9xof2 g/*ea8wyy)5 g/-0i qlnqxoyko6pr3 the current2n /in 8f6ok*eo/qy w r3p 0g gx-5oqa)lxyky9

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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 changeszj*zvu id9ad;q7ha;2l :f2l b by what factor when the frequency9l;2iz*bul;adq h zvf ajd2 7: is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the capsj0*nqq1 l)ga 7q ml+jacitive reactance of that7sa) l m+l10q*nq jjgq 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 7b jy9l*q9 hehthe voltages of the inductor and capacitor in a 99*h ylejh7 qbRLC 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 is defined adum:smvk2:;p jsr+) qs $\cos M = R/Z$, 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 increasesl(d4 8 zcwwb *7l+ojxqxi6h2s if R increases. When is this statement trol j(xlqwbisx*c 726+w8 h 4zdue?

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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. Thce o 2fu)* nwyv6c0fo9e impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedx2b6nz4d6 8m r o)oj*xa 2iodyance 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 both double in an LRC series circuit, th, zyz8 wk5,bvee resonant frequency of tha8z5k ze ywvb,,t 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 , mw -n5n0rcdyresonance,

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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 g8p7 ex.mp(*rcsud ylb1q31r occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic f+hl6o g:5k4o.bb vbgt ield of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and l5:+.t kg bgo4 bbh6vothe magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic e +k7d h6frbz cy1;cx2field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magneticckyx6r c2f7bh+ 1e dz; field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a unio0kqs2 6ey/ hhform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the mhs06/e hkqyo 2agnetic 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 a-u(hqb17oun8 n cn(z6e rbd3zz yn58zrea of an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a com9 h8 utzyi+f/il 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 onhomeh1 iegb1+cc)y: qar/( r 1eua z89 a square frame with sides 18 cm. A uniform magnetic field is applied perpendie( /+gq1ri1:1m )beahz98oacr u heyc cular 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 wit4;mmf t .mnl:nh 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and-3k8/*ooxd fhb9 mq xux9 gw b:mor/2s 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 l wjc8t)m/4/zh/p1 l w-:t4zygo jevf oocation where the downward component of the Earth's magneyg/mh /f v8)zt1p 4t :jojz -lwco4w/etic 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 qdovhgi5a*62fq +b i;t 1:iofthat is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a const v di1of* fig+tia:h6q; qb5o2ant 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-sectional aratm8 zu55 35oidnbxt(ea 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 l5+g;ozecrtce 58krs l /,ntja+i 0/fof 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each lo8ui c+d*8 50td5:wwb ubhcn/q 8hreccop 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 rotub8n+5qcecb ctw i:duhd58c8 h 0/*rwates 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 100ju+6vw3*q5nkto.q ol turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output o23/c)bl yv aaff 12 V maximum when )yf2bla/3 vc arotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a m+ae6we 70. z /ux(9hx,4gotmzrc egqyaximum $emf$ 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 resistczqk*ec7b v, ;ance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motorr yp0q6:vsoat.4)ws 6f 5xnh xva s-8t operates on 120 V AC, and when running at full speed f - sswnp th qxtayxr8s5:064a.vv6o)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 is7lwf6u0i ip z,i )tai- connected to a 24-V power supply. The operating current is 1.0 A. What is the st)l7a -w0i6if u ,ptiizart-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 connect9fvbziu e-x8u9 dk; kgc ;yq*7ed to a 24-V power supply. The oper87f;gc kybzdve9*x; quiuk9 - ating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is conzbs(blsj;rgtc /y7+4 nected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the bacl4+jyz/;(ss7r gbctb k $emf$ 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 pu7, d:nhqu. ps xp-)nto 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 huew p 0h2 nr1ta8f/d(transformer causes 14 A to flow in the secondhatd(f rwe8pu102/ nhary. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if the 24-V se v s6cob4or ,*4cj9jins5qy/ y dplh33condary has osq9oscb3ip4hjy n*c3j /,6 vd 54lyr 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 :6n:d cm/ dj9p g/lsai6a4 .ct6 eh2nomvg p/i500-turn primary coil and a 2000-turn secondary coil. If the curric :6tn/ .ge92am movdds pacp664ni//lhj:gent in 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 hy x2h/v ;b4tlz,)f jr6vleg0in the primary of a transformer. Assuming 100% efficiency, howg)r l /,ex2b;yh6lvtzv j40hf many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign trni gxvi. swh.:4cr8a7 ansformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary draw?h.4 iw:av7c8xrg.n is

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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 o- b1)6pji8qsde 1 xlscoil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is p xi16b8sd)jpols1 q -eresent 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 * 63qocz(pazvcc2qn; 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to t6zc;qzpv3co*n 2 (caqhe 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 5fwi/ +nsfh)l zp/*yt761 ezfni e-ezhas 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at th+6 n5*-) z f/ pftiw7ily/efeenz sz1he secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns an pkw/1+gvfp4v8kp23 l t /clxsym8 (pld its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output v(83tlkfmwp/1pp lk8y vcg xlp+4/s2voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 qcjb2h x8) x25n-cdu lturns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (nebdnl25)2jq uhxc c- 8xglecting 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 usuat at :90hoqeo5lly stepped up to 4500 V bh t0o:q9e5toa y 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 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 usually steppedlfp(3 8fc09r8u79,u iujn8 bdanw bkn up to 4500 V by a transformer p3u7u9k rb nj8 il0cnnw8b,fu f8( 9adand transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current atrp gg3mlrc65a+ ot) x: 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the volt3 cx:oprm)gag6+lr5 tage 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 50k-esr(wkf( ) 8 r9gmy14 upmsu2wp.ue km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not usedfkk.se9e2 umr 4p8u mpgwus)y-w(1( r?

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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-r:ceq8 fincsr0jk4:r( ff g- a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when thrqr-is ke( :fc 4-cf:08rnfjge 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 power w; p1is nvn8syqm/i2(iould be lost if the power were transmitted at 3000 V instevis n ymi /ns1p;2q8i(ad 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 a*c9 az/nzo-eb:c9f rrt 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of thea9c- rz*b9o:ce r/nzf 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 ueup6j 0+vxj: stored in the coil's magnetpj6u xj0e:+uvic 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 resist, /jfr** . qts;tbetqsor and an 18-H inductor. What is this circuitf*.qrsq/ st ,jbt; *et'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 l5stu (yvb0p 2an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 1 ( sd3i y5 js9ow5tkxe1i36otjx+t t:e20-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. Wh0n5bxxh //b i wa;5p3ft6qbve at is the resistance of the lamp/xnb xit3fhbwe50p/vq56;b a?

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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 supply. Whab /cndl71-m mgnv39.b iest-ct *joq(t is the peak current through the resist 7/3b-sncejqt*n bcmlg9v -it.d o(m1or?

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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+/cy2u eog2 gz a 120-V ac power supply. What is the power dissipated in t+gcy ge/zou22he resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is tm v626fkj e8.3a-eik vm7l(doc qne .$I = 0.80 \sin (240 t)$. 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-Wxqqgagf eo; /(/5h9x/ wto r:h resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50ye3 mg j1q6wo1cun30j-W 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 reactancnd oo y.w05zb tlzsm z 6hmh,ad2t-(b.t9- )goe of a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH l) l( jmygk;u(coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency wil *5 a5b xlg2zgyw* -44zz;)lghfqhzhrl a 14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 1000 Hz?x5 c / j3ov4(yskojhjus+:h: xuaxd 49

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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 1w ,9ohv hsc-e920 V AC at a frequency of 20 kHz is applied ,h- vse ow9ch9to 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- be pz0b2p,nw-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitoraog4xg1dii b0;. t.xr at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at 10 kHz+ b4l/5x q3 s7zdgttit?

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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 ha mkrhok:u3 -i6ve a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.0s fx6l ru(jf:zm s3a mus0)o8,10-mF capacitor be 100 W?mrf306xs o, s)mlu 8fuj:( sza

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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 capn075 vgk ( nuvpxx9)ykacitor 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 resistance, 15.0 W ind6 7/; rqh sh(nqx8ar(k*zgkmductive reactance, and 10.0 W capacitive reac/;( q(gnhdkk6*rzr 78mshq axtance?

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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 at0qc-/ 9rpx0yng;b53rgm ayj u 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacito-jbyc mau350qr0 r/x; 9gygpnr are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, andkllbnf 5,6omnz0tk3 * 1.0-mF capacitor are conf n lb3*,kk5oml06 zntnected 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 in series with a 20-mH inductor,l+pstp(2 )72gtt /mt3li ovtf what is the impedgl/3mv o+ ti7t (ft22l)sptptance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is th vv 92rvgc29*x wb8dvve phase angle at 1000brdvw9 8vcv22vxg*9v 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 ibpz9gyz;,el6, imr)with a 20-mH coil and 1.0-mF capacitor fore9 ;zgpibm, ,ylr6 iz) 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 capacitances is needed in series wim;tn *i1o7 s6nl9zre1q / iqbfth a 100-W resistor and 15-mH coil to get a total imn/ri 9q11f7n;qmzltesib* 6 opedance 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/ d337ixow8k-ibhxgh 9rx6 fe with a 450-mH inductor at 5000 Hz for a total im-8 x3xkifgdbih3roe w 6h 79/xpedance 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 serie2ve75o 1vtqd ns with a 100-kW resistor at 1.0-MHz for a total impo v5nd2v te17qedance 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 capaci ;a ;2qrlz2iewtor. What is the impedance at 100rqawe22; zi; l0 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 neededea0 fbi8mkz3* in series with a 10-mF capacitor at 1.0 kHz for a total impedanf38aem0i *zk bce of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a phas1td:8prkkul5os 79qeeo:edq sk7l8 t5puk91 r angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.hmk.6ud v;qjo pu 1k)50 kHz for a total impedance of 45 W vqup1muh 5d6kk) ;.oj?

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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 i w6ph9s ,*i,uo 3xlwq2yjdn j1n series with a 100-mF capacitor at 120 Hz. What is the phase anglw1 o x,n6pu ,jj*9q2idysl3whe?

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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 resistg sloy9;b +l,aor, 20-mH coil, and 1.0-mF capacit bag o;lly9s,+or 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 consists of a 100-W resistor, a 10.0-mF caoqfh5649/xy :p gtr egpacitor, and a 0.350-H inductor. T 5gq9g4e/6rp ofythx :he 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 capacitiu+2ec0s0 z u +whcud+ive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz powe0ciz0 dusu++uhw c2 e+r 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 anglp v xbb (hnz0rh.j 32zqg1t:f)e 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 poweh fpxq1 3jv(2b )ghz0t.brz:n r supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a g; jc, 22/ti2pvyhn afphase angle ofi2h2a t/,yn p2vcf; jg $40^{\circ}$ 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 hl*cudgebk66d *yb.(kvi -c(z 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 (ck(6zdi*uyv-g dkl* c.bb6efrom 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 circ,zj n x/5nzzl0uit with 12.0 W resistance, 15.0 W inductive reactance,0x/ nzzz5 jnl, 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 A q0.4gb,2 mln* cdpyayC 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/ h/i5iv1w8 /fgoc)jldb ;z bw a resistance of 30 W. What isfgo)5;zj d ih/8 /1ww /vbblic the 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 conwxl35b omkf 97taining a 50-W resistor, a 10-mF capacitor, and3w m x5o9fbl7k 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 1.0-mF capacitor and a 15-mH ck* d rmjn8qv,wh1bbr* ks 2-5coil in series?rj* qw mbkbs,2h81cn 5dk*vr -

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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 resonantin kt:(+h*e e emev4:+1dwv bt frequent4ev1 wnd: * +v:hekb(me ei+tcy 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 series wit6j c58pfl9 ouyh a 3.7-mH inductor for a resonant frequency of u col6p8yf59j 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 a(hzr ia)+;cq be placed in series with a 30-W resistor and a 40-mH coil if the rei rha;a(qc+ z)sonant frequency of the circuit is to be 1000 Hz?

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