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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 -ai*1f7beg3 3 nnw- 1y9ikq ge*jy yuiexcept

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that the a.zo hjv):ff)k6x+ n-sx c3as $emf$ 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 whata05o orff( +wj)kvml.m0 gx0g kind of change on the 0gf+mj.0g)vmxkl rwf50o ( ao induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire producerc/lwqol0yv u 16;e5 es what kind of c/ocwu5l ey0 6;q1evr lhange 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 lvrts )dy ,d*oirdf gr-:,2e c.oop of wire produces what kind of change on the indu e2sr:.* ,orvfirddd )cyt,-gced $emf$, 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 fie kg7jtber7+ocr 4(u )zld 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 jsmc0bw2 0pi/ of an induced current in a conductor will be that which tends to produce which of the followiisw /mb20 p0jcng 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 l)rncovy9e5 -0 o)u laheld above its center with its north pole pointing down. The stationary magnet induces (when viewed fa nyco)-9el5o0r u)vlrom 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 okeq*++,njz /f +ulqgpn 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 inducelu,g j*n+f+ e/q+ qkpzs (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 weon vawvh3. .:here the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed fw h3o.nv.aev :rom 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 regv wi3 ak-c/ dsjbj (h.+k18klgion where the magnetic field vector poivijd.akjgs3 k kh cl 8b(w/-1+nts straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the m1(6 pmzo;hh 1oru a.-b o4tgokz48 vevagnetic field points straight down. The magnetic field disappears suddenly.ozt8hp o-14 o.;voez(m4 ubh1g ark6v When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal tac;x (50ks7m -pbn evghble and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. pk5hx cgn; vm70sb e(- When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north polep7mzw; 605 ru h8 uiravw9*dhc entering first. As the north pole enters the wire, the induced current will be rz0cuw rmp958hwdi6 uha7v*; (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 angi qce iy s;t9wcsxj,;v*o87a )d hlp77ular 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 t;l97aq8d csov c) ,pxyi 7*wse;7 jihthe 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 angular speoe.s149 la1ppa.f bewbgps7/+z 8y h kc8j(ueed 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 loopwjpfbegk 1+ eba.as h88yos1e 4u( p.p/z7c9 l'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.49)uoqs7,w cegvd qi4
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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 u0z5x*xf5 ezn. g9 bnlthat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic fi7p(0cfj cpmq8mg/rwl 05y 2ebeld. 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 (orienlk/m0tg 7a7d8 pbdwg;ted in the east-west direction) is moved northward at constant velocity through a magnetic field that poid ltwm k77g/dg0;p8 abnts 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 7ol4t ;(pe k )uo5zobzangular 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 transfvp;-/alhslzmlx7s fk o2 64 e4orms

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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 revo*2 is11jszyk n5cspdfeo 4j /6lutions each second. The frequency of to*ys/ jc1n5i s6s1kdjf4 e 2pzhe $emf$ 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 dev7zmlwsoe )3b3 ice used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device th/ xxgshmci:o 0;3ie13 mbkeb6 at

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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 co b kbrhn(u d 96:m://xdpq5wsvil contains more loops than the primary coil t6/d/:x b(pr nqumbkh v5sw:9dhen it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the h3a/0 cea,wvr56jxml primary coil contains more loops than the secondary coil then it ishxr36l,v5c/jm 0w aea 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 pj /umuwh6j 9guc/ 8(2 tbfvgy3ower input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant ci,*f:ym9 z rext)s-hxzrcuit,

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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 conne s3/8k).cd-e+tim (yqddyagv3k j/m ycted in series to an ideal battery of constant terminal voltage. At the moment contact is mademyg3qv3y yd(kc dkma.8+/s t)-j d/ei with the battery, the voltage across the resistor is

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，获取更多资料
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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor arzgswj -*a)r .ue connected in series to an ideal battery of constant terminsr)zj*w a.-ugal voltage. 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 connecteyu)l q/bae p*1d 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 coexcgjeq5 71 l)nnected 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. rec rfvsy,/+z/k;sr c(:n,a q The time constant for the circuit represents the tim +skrf:rv a,cqyn(s;/e, rc/z e 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 connecte9uq.nh x5 lzp/d in series to a battery. The battery is suddenly removed from the circuit. The time constant for on 5 l.xhpu/9zqf 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 unit*zg)n32r l ko gxzi t.wk9r;/ts 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 supplyr3kni2n;zx/kvdkq 94o0lu.r . On 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 to an AC powe d ch3yv2rg0jr 94ex1kr supply. In this circuit, the curren1c0r2vyj 9xg dre3h4kt

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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 the 0zh5g+mv7. t/ qwrdlgfrequency is mgvt5g+ lr.07qh/z wd 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 inductor isno3-5 satwdrv 7e5u.t doubled, the inductive reactance of that57trd oas -euwn5v.3t 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 inducte aaei:n8fp 2kv 2;h6vo iq(cy40.q0zy: qq lhor approaches zero, the inductive reactance of that coilp0:cvonlayq hq 8ie2( yi ;vhf6eaqzqk40 2:.

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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 ci sy;hjl*95.i eexzv 1 rgnj7;ercuit, the curreneg1.shj 9 n*j; 5vylz ieer7x;t

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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 whaec*. + sa+3e.houy kfrt factor when the frequency is tripled?e hy .os3kceu* +r.fa+

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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 kxatj yp7844 uAC voltage across a capacitor approaches zero, the capacitive reactance of 4 u7ja 8ky4tpxthat 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 voltll +tvg 3)81olfhvij8ages of the inductor and capacitor in a RLC series circuit?1lvglo3tv8 hi+j )l8f

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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 7qqu1,tnv7py 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 increases if R increasu thtj*c 36mx5es. Whe3hm tt6 j*cxu5n is this statement 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.tz,z0 ti7g z;ji3li h zn(25mj The 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 gf c h-qz371s9nqh +e)3wp qiycircuit. 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 d3e+o 8ilkr 5kthe capacitance both double in an LRC series circuit, the resonant frequency of that circul8 3 iek5rd+okit 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 dri)ff:qqm -6r qlh6mdb- ven 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 circui33jfv js6iebf+sm(0 s -7f i dnus8eb,t 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 mc;oibxui 7znn0s 3 q*+hl.(ir 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 pa( uqi h3zo.7r l*;c nixi0+bsnrallel.

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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 rs8c q6e :(dtb(at;cri otating in a uniform magnetic field of 0.20 T. Findsteca6 8;q r(bd( :tci the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is ro:lo52v0;/lsbx0n o(iu.mrw osj)rsy tating in a uniform magnetic field of 0.20 T. Find the magnetic flux thro (5o/isjvror sn;):u0obyllx0w. s2m ugh the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single lo)vt)gtrnc7asf*u*+fz igs *j-1 jgi6op 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 frolv7(w qs8a :akm $4.0 \times 10^{-5} \; Wb$ 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 ffx/+.qc ; m4 pu1exwhframe with sides 18 cm. A uniform magnetic field is apm1qp4;hfuxe./ fx c+wplied 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 15 turns and an are4 f3 ;7.lnbrk0ev iq(bwaknl *a 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 arem,,z+j;h+r lz4s otznfw: +y ta $0.20 \; m^{2}$ 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 wingg ./5kh ix oq+pgzr+p- r0wf*t span of 60 m flies horizontally at a location where the downward component-twgif+.h qo /xppg5+*rk r 0z 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 n6c9x23w6lfv2 u jo6j 6 r6ye*3 i9zjrqirxgaa constant angular velocity of 2.0 rad/s about a vertical axis through gjcwra n6*fvxrie 3 6ijql3x99y 626 r6z2oju one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-section 6wnck u/bmy)6u,qnw,al 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 consistwv+e1le6oo+ hw,pdx /r1 dsb5s of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular lo z.eo uur3pfe8ya8g(1 3 9xhuo,dd7haops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotatxrhaeu3 81a7u(od .efuozd3 hg8 y,9pion, 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 cons fzth.:jk(d5q/4vte,i+2etp tr7old+sfli4 ists of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a (r6df-t3 ujknnxu )7k simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A mrn3xfu-6nd t )uk kj(7agnetic 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 witsf.r qa9cl:z+lxj6m a f4-/uu h 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 resfbj87zp a9vw,,io5y8 p /ofpi istance 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 :uvh1hg mu -n -0fvn3yresistance of 6.00 W. The motor operates on 120 V AC, and when running at full speedh1 n vfuymn:gv0--u3h it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power suppl.k;nk,4e8 j(b w-x fc afkcd9ty. The b wck4d.f8,9f; txne ck(-ajkoperating current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W ib9tou ihxx 1(igzvre asth e5n0(,059s connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back ge5v ui1(9t(hb5xe0ohtz nr0 i9ax s,$emf$ 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 kt3 vyve 7;q24frh.deresistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A h3rvf2eky eqd;4v7.t at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is nee 5gm1u;sgikwy kr 80cia; n31hded 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 prix( :fcf ay/t/1zi 6ljwmary of a transformer causes 14 A to flow in the secondary. How many turns are in the secondary?tl/ 6wxzc1( yjf i/fa:

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, howstc .o*6x1zazyd) zt8 many turns are necessary in a 110-V primary if the 24-V secondary hastt8 )zc* sz.61oy daxz 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 pr a4hm 7;f+wy igcv-jp7w +sc8dimary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the c+-jasm;7p8c wvih4ygfw7d+ 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% effii b5h*f)i03j ff 1bzp5coam3b ciency, how many amps at0phfbfm *j13fzo bib5 3a)c5i 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 transformer prgazi-kv c (pdz0pd(i-ocg9 63 s)/x osovides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary drag -gdikipo6 9a x-s()dz o3c/v c(0pzsw?

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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 it:+. f augzqcx3s primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what vo+zaquc: f.xg3ltage 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 30/5*cybc 5yt;nsnw :+o: qd mks0 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, :bot:mykncwn; q/s c* ysd55+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 200y yv,,e l,lkm3 turns. If the input current at the primary is 100k,yy ml,e,3l v 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 hasa 64w bztkzc.93/bj- utgwje:3 sfb4 f 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output vozwc 3gj4 3f/k-.a6fzb4ew 9tbstu :jbltage 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.igq8; x4b a*)yqn,d p) 5w4mtdrbhb h 100 turns and its secondary has 200 turns. If the power input to yh.d) tpb q45bqrbx,)w *gadi 8nm 4;hthe 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. h 56znf2p1xje 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 n5f hezjx61 2pnumber 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 0g*7qca8-kxkp kkrr6 current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power li 7kp6q gc ka8kr*rkx-0ne 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 at 120 V. The voltage is usually steppe5dvjo8f;b/ mg d 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 lind8;g5 bm/vj ofe 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 0.60 W. d 1j 7tfbzlv ckr2166y 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 wof6 y7jl rb6c1dv2kzt1 uld 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 resistancexn ( zm7eznld6j)c+t- of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy lossje 7)-dzn( 6tzm+lcxn 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 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. Hokml/ u 6*f6bhsw much less power would be lost imhb/s6 lk fu*6f the power were 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 o/q6q5 , tvysx7jy0voaw e;.-etbh5v c n a line with resistance of 0.60 W. To what voltage must the gener75,ao v jvwqyt. 6yqeht-5/bx;se0 vcator 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 stored in the dliw8k)0f.mkc ;0ocfq v9zc0 coil;) wkd0 flc ivc.fzokq 080c9m's magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistorvpos 5u n zpoy9/3fy70ojkg7 0hvz-)k and an 18-H inductor. What is this n7ogp pyv/f-h39 7jok5y 0vkzu)s 0 zocircuit'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 rm hh8i gg,n;tt3s 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 the peak currenepcf:o; 8r l0tt?

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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 qk0cq 2q.2nr*y;yo:,b)a g k s)iyckg AC outlet. What is the resistance of the lamp?gk)ac, cs.y qr q*y2g0 o2;:bkniykq)

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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 axj 0+6k-wgycv 120-V ac power supply. What is the peak current through v+wy6j0- kxgc 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 poweiarl 5bud:5bs upb/3(r supply. What is the power dissipated in the resistor b55rua/ldbipb( u3 s:?

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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 resq/c p2rlc4/4(pw ;in wnovo i0istor 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 resiss5t2dovj3 f(ez40ri t3h zkdcr +jg12tor 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 resis1v(x3h v-w rjptor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 60 qbnd;0 l4zmzbvj( d;9Hz?

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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 reactanceo*m:yaoibg+l w ;eq ( g-3ziqmr 8b /ln;b)6sa of a 2.50-mH 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 will a 14.0-mH coil have 14.0 W of inductive reat1,ns.-s+li,s kjcvg ox ;nx)ctance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necesf 8:lps1nfn, m65lq uxsary 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 indo1 c-b zmbk;+ dz28odductor when 120 V AC at a frequency of 20 kHz is applied tdbk2-1dd8 oz;c +bz moo it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due u+zq:tx;. uug0mwaa )nnlm+kf:w 1a2to 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 capacitiy.x.m .hdgs/ib i hy;vxq+ 2i/ve reactance 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 haevov,i-a x6 +93 ftsgdve 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 caphdy-uc m67/kj :uu8vmacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactanc uxe:0j /;acygn nxr(6e of a 0.010-mF capacitor be 100 W?y /egx0x c;:6rjnu(na

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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 1000 Hz ann4b)wyv qt.x 7d 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 v4hp1)a voi vn /lb+ ebeffji9b-o:32ez g/ 4mac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive re /+ag np/-24z:ohif)o3vvlb i jb9b fe41vemeactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH lv ck1z2 . vlyryayg1jv )49u7h(5fcicoil, and 1.0-mF capacitor are connected in sejg)y1h.(uv1vyy2lkrc9af7zci 5 vl 4ries?

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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 ang uobb0: *pu+unle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connenb0*: +u uuopbcted 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 witp q,km5 j1nkt9qsu 2/ uqd-0coh a 20-mH inductor, what is the impedance adkkpt qs,qqu5u9 1- n2 0j/omct 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 i9 o 4h/ .y/bdb2w:me3 kh1hyenp 6ehfonductor, what is the phase angle at 1h3eb9pfwbdhmo:4h 6nh/ y e 2ky1. e/o000 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 we um ys-s0byr9 *.hcj3ith a 20-mH coil and 1.0-mF capacitor for a total impe j 309r-ub.*ehyscmsydance 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 nelg ne*enb4a3* eded in series with a 100-W resistor and 15-mH coil to get a toenea**3nl g4 btal impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in sergj jm(:.)vy gfies with a 450-mH inductor at 5000 Hz for a total impedance o )yv(f:jg j.gmf 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 resistor at 1.0-g/fclgu- dg t*iac,tcc85cutb. z2 -)MHz for a tot t,zctl-uta*u.cig25d g)-/gb c cfc8al 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 67g 2wa.rs9wamvow) 9m jx.gnthe impedans avxwg.mo.7grmj26 n)9waw 9ce 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 at0 njgz9*csna7omt: f m8zz;f. 1.0 kHz for a total impedance*9mm 0n f7:;8ntozjc .fzga sz 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 wivhs4t5*a tst2tj8 a);qoy5k: oh rqi-th a 10-mF capacitor at 1.0 kHz for a phase angle os2t :tv-ty*h5oq;aj4 qtokhiars)5 8f $40^{\circ}$?

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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 se(i*fkspqh, u: ries with a 30-W resistor at 1.0 kHz for a total impedaks(fi,h p *q:unce 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-m(q-qunr6l bxq9 f qb(6ebt6 w6F capacitor at 120 Hz. What is the phase angbtu((qn b- 6f6 r9qxb6wqeql6le?

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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-r4h6;yx) u4k aqf hpr 7uy5tu8 k12herw 7,sqbW resistor, 20-mH coil, and 1.0-mF capacitor are connected in srxat ;78,2 h)bre4w 476rpk ksh quh5yu1yquf eries?

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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 v,5.yy(uqg0zo hvl4 z-W resistor, a 10.0-mF capacitor, and a 0.350-H inductorhz,45 l0.goy zvvqu(y. 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 capacitive reactance 30 W, andqhyes 0s zn6ned2*(2u 8)etwllj(p/ n an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circui dw0l(eee/h2)uqnjss(n2ypt 6* nlz8 t?

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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 anglek e/9l 2g e,awrf*znv1 for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when conne 9/ *z,lvanfe rkge12wcted to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resi o x v+p4wwelnof+;wf*7/z0z wstor for a phase angle o/fw ;o07ezw4zwwo* xvf l ++pnf $40^{\circ}$ 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 =vc)yw7 w ;n0t;k m 5ject49dvw 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circwv;7 c ;twcdk9y0)n 4jmtv5ewuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit witha1w*lf ):cnbm 12.0 W resistance, 15.0 W inductive react)bn:ml ac *1fwance, 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 AC circuitrver70hp8 c1t 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 abtyzih:ykek 3z la*5+6 5y,o+xfg -mbn impedance of 60 W and a resistance of 30 W. What is the power factor?o+mk,xhg - ty:byek*3+zyzfi 5b 56la

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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 conti p sl3jvn0clm; p1/t+aining a 50-W resistor, a 10-mjm /s+0tl pcn;il3v1p F capacitor, 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 1.0-mF capacitor and a 15-mH coil in,zm7n 7ofsdtrl y70 nd84ke-d series?fo8rzd4nydk7, md7st-l e 0n7

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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 resonant6l4ii3-9m h hawt(r8tq mkmi 7i4d2qy frequ kdhi43m2iqtyhr4iqila(9m-7 8t6w m ency 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 j msp yymn499/wq do,m5oh(/2 tcc2kyseries with a 3.7-mH inductor for a resonant frequency of 1mmco5y9h cwd q(p22t9ny , s //o4kmyj000 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 ar1l3 :bizj-vds7c*e5af:yb 30-W resistor and a 40-mH coil if the resonant frequency of the ciaebvj3cz *fy 1i: r:-7sabl d5rcuit is to be 1000 Hz?

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