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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://mail.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://mail.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 oh gp5rwj1g9/q x. md5tf magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction stateju4)uoz k2r6ll+ 8eyd8 nna 8bs 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 qtp k5 )fns5q n9y(:wweibf.1a coil produces what kind of change on the induced t9e5 (sqqwfwkyb:pn1n i 5 .)f$emf$, 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 l45c 9do w;fqrtoop of wire produces what kind of t9dqc5 4f; orwchange 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 wirep/8os7xdjpv)2 ;atu a produces what kind of change on the induced 2 td/ox; a 7vpus)pj8a$emf$, 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 magnet0qeq37b0tysy 0(mw e xic 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, tt92f qydy3+ aidt: f8fhe direction of an induced current in a conductor will be that which tends to produce whifa d3y +:d 982ttyiffqch 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 held abxfksy*p-vf) 7ove itsy k7-)f vpxsf* center with its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnetr;j5st be 2ti. is held above its center with its north pole pointing down, and released. As it approaitts;.b 2 er5jches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the ma l 9 m)z1(dw*i)yfmwqognetic field vector points stra*w w(l y9)md iqmf)oz1ight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region wherjjol+ w4kscj .9 o57bve the magnetic field vector points 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 fi c+.jo 5l4bksj7jvwo9eld 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 ;c)o+m,lr+ vo vqc 1zxv35aycregion where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced currenov,vmv+5;1+ z)o xqcc 3lyrac t 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 39v:sj.vnvpiah ep*4ly z 7w+carries 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 induced current cai*lz j +n4y9 v3vwppe. 7:svhircles

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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 northij+txxp3cyo l-b.e.(h 0k 5cz pole entering first. As the north pole enters the wire, the induced current will be (as viewedo .c e+5b xzkip3tjyxh. (0-cl 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 rotattt7tni1y/n v+y2ht w4o/ 8gmp-3ik thed 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 nk/i ov+ytg7/ t8t-4t mtyn31phwhi2if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about ,oyp(5rv qfi 4an axis whose direction can be varied. In a region where a uniform magnetic field points strao4 vyi5rpfq,( ight 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.r4w8cgctoji2y5 k.. 2wqs z:v
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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 thozc jnt )05h:8u 5smkwer9cl5at 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 field. Thw-m 4a hnj2:v.oipmgt8x k1v9e $emf$ 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 (orien+sq/,c12s ud0po xp u5ntl:l jted in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the u/ 1,qdnsox u:tlpl50sp +2 cjpotential 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 veloclfw,o4zv dy,78j:lsgm3s+ qbity $\omega$ 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 tro + ab1 8e;xablt3/ mmlyzf*r0ansforms

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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 seco3ja;j1 zm*refl-9b dpnd. The frequency of the pjm aez ;df*9-lr3jb1$emf$ 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 used to g,w cupe:ub1n:r ,(jf

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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 de;/.r heon ;xt6viq;gevice 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 primary co7fph a93y-qeqtw u2,(zwm (7zok kf-ril then it ikzwwmfofqya(7 u r( ,9ez --h tk3q2p7s 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 mowsys j .-tt02tre loops than the secondary coil then it s-tj0t2wy. st 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 por,h :v taav ..mtxvmm )x((mx8wer 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 resonaya (uj83)wr evy 5q+4j6f vsqfnt circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an indu0qh6 w:plna,*bdndocg 7 s .;uctor are connected in series to an ideal battery of constant terminal voltage. . lgds*ocwqb ud7n6a :0 ;ph,nAt 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 jztag;q q*2 5a.2duf wseries to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the in aq.* jau;qt2fg5wd2z ductor 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 connected to l )ytcrk)bej/ i(/ j1opma5h8an $emf$. 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 and9r- itu.t.k4h ck )gzd resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connecho pir/q6 ns5.ted in series to a battery. The time constant for the circuitiq6h5prn. o/s 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 se7h b2hd2upd jvao. *n7ries to a battery. The battery is suddenly removed from the circuit. The time constant for oh paj7n 2.odu *v7bd2hf 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 th/f 1z; kc -b:ghfpab8me same 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 powerzs-u0n5uwg 6lupw,j;t lq 4k9/n ii e, supply. 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 anp+sr 6*; gzprf AC power supply. In this circuit, the currenf 6+gr*rz spp;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 changes by what factor wh ly8o8 qjy4zb+en the frequency is yzjbq488 ol y+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 inmzoi*tlbtevph +s)p)5;- s)rkov b 60ductor is doubled, the inductive reactance of that indv)top +ih0sz ; *-s)pv6krtbmo) 5lebuctor

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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 approaches z+v bwvn.ao 5z+ero, the inductive reactance of +o b+z5w.avvn 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 connecte +kjabs.6ucaumuk +jt r1(3:fd to an AC power supply. In this circuit, the currebjujs6 a 3+k.k(um+act1:u fr nt

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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 changec77o /sz. 2 sqmkv;hjes by what factor when the frequency ihcms;ez q727ok/ jvs. s 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, the7k 5o4ww8whvc capacitive reactancec wk 5h874owvw 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 ad 5t1 ho*xhtm/nd capacitor in a RLC series circuhx t*ohm15/tdit?

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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 a5,jvu3,jaf .n j2 v s3bf.sz3t0s ; ar5svpfdzs $\cos M = R/Z$, 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 in106*r1qf ubolz3.z oxr amz4 dcreases if R increases. When is this s6a1d 0mox lr34 *.uqfzo 1zzbrtatement 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. T 6xdadth9: yz-.+dkmkhe 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 serien, waji2wqbq-m4)syh8.to . ws circuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circfn1(nso: rj4*oj-k alnl ( w1huit, the resonant f ooar(n4 lhn*l-ns jf1 wj:(1krequency 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 appl32a*3 hgqcen aied 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 Rzla )hs1;+d qgLC circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 mci3p*g9b,h* ;v4mzyp n qebn3 is rotating in a uniform magnetic field of 0.20 T. vyip bg p 3 zben*n*h,3m4c9;qFind the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating i-j., u7ptp l depz7)dkn a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of 7 t,d .pkdu- e)plzjp7the 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 rotating in a uniform magnetic field of d+cujj p+ x y8fut+4x2 (o b/nuq;gna(0.20 T. Find the magnetic flux through the loop wh(ju(xtu4jp2+nu /d + ;by+qnox8caf gen 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 loop is reduced from5( pstu7uz)z ., vlk ay.emsik0af+j e 7/on6a $1.0 \; m^{2}$ 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 fro/ psq xk0 fk7gh*dd/ 3jai)s)rm $4.0 \times 10^{-5} \; Wb$ 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 squj6plmdgz1s x+62 ghr+ are frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. Ipggj 1mrsz 6+l2+6dhxf 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 cuh nu08ijftf b :/n.7turns 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 aysfhxs+ 0 s6z5nd 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 658i r 8tlxkjsr-xzhyw)0 rh+ at a location where the downward component of the Earth' xz-+i h8r6rrh8tsw j5l0)ky xs magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant npmoupcp+p:1 9o/5mg tv3 u1qangular velocity of 2.0 radmgp/qvc p1p3:5uum1t9 oop+ n/s about a vertical axis through 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 a+x/ ywc5jv qcw*t64n rnd a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wi qtwfe: *2b1 1qvlaoy4r2iht :re of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop iy k0,dh. 0 b c+u8nzk0ii0 .ld+r,2nkg yrmbsts 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 perpenl2.yd ,gurksmkcnh i +0r0y+dnt.8,zb 00 ikbdicular 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 100 /g;iquqx i) x4turns 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 sim:u1:ivrv/ zafo6d c+wjkm-j 1 ple AC generator with an output of 12 V maximum wh:dj61 mw:rzu+ifvavc kj/-o 1 en rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maximukq2n t mg)a g)eha8c;,m $emf$ 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 operateg:(i6ps,s)gb ro2f 5p:ojwd qs 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 rz3aqcb9v/n/ze/7fp2f td gx 0i;p e+motor have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full z/t/zb2qpde/x 3 p7 nigcff9e;v 0a+ rspeed 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 suppvy:p+h eqr,4rhrq.:d ly. The operating current is 1.0 A. Wher ,.rh:h: p yrvqq+4dat 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 res) *vnwdbq;-vw istance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is th;vw v-* bwdnq)e back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power suppl0w s i(yh5vls*y. The operating current is 1.0 A at full si y(shv0l* ws5peed. 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 ne nxdnlr:r9;r5 eded 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 ;o6yanake mub.c2.i; flow in the secondary. How many turns are in the se6;;k m.i.ay 2caonbuecondary?

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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 thhafa47f vn;c4 cr ky.2e 24-V secondary ha.k7 r4 nvh ;ca42cyfafs 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-turn15;:ieztbm+f by,reo m.t8e 4nhi ob( secondary coil. If the current in the secondary is 3.0r 8,;b+ei4y m to.mzn5b te 1bie:o(fh 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. Assumd dcc:k 1v*tb:e48sc qing 100% efficiency, how many amps at 24 V can flow in the seconvcd1: dtk:*eqsbc 4c8dary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. T b,q9wo1ooms 1he primary coil operates on 120 V. What does t mqoo1o 19s,bwhe 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 tu fmdd9* z-qyk5rns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is d- d*zmkfy5q 9present 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 its2 w5zdo -3t* 2wkpxy( ai1grgd secondary coil. If 120 V atzor dt* (3wg a52gd-xyw1k2ip 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 200dan2re. :9rte turns. If the input current at the primary is 100 A, we can exre92 .rd :enatpect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary yx*w/ crqt7 2poklamv1np ,-5has 200 turns. If the input voltage to the primary is 100 V, we can expect the output volt1nto-ck7v* m 5/ lwp 2r,yaxqpage 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 turns:9 ydg kldkhr ve f,df0n5p,8bi .-,sj. If the power input to the primary is 100 W, we can expect the power output of the second gp8sf9.,, hdfekyddr ni :5-b,vk 0jlary 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 atfd-a+ve:z re ;n;/p pr1eev3 +na c1oppz.r5g 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 number of turns in the secondary if the primary has 2na;d /:o35fepvreg1zcrape;-1. pe++ n rz pv00 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 acs j4ss fgi29.- j u(mezpu va1j7dblg: /5:qusually stepped up to 4500 V by a transformer and transmitted through a power line of total resistasv(c p j7lq gi/ j1:sub5e4-zdu .a msjg92f:ance 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 vol/7 1aobduqes5tage is usually stepped up to 4500 V by a transformer and transmitted through a 5eabd1q /7 suopower line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistanss g lu3j7bn-a0b9dj4 ce of 0.60 W. A generator pr 3 9 susjjlb4-b07dngaoduces 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 used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance ;qu(ysu4gr4 (ywto7aof 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 ra7ut aus(g4y4; (rwy oqtio 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 sh*-agfgo *(89qxes4r -drq z4; twcg down a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead;* t4 sg* aq8x-eg4sqr-9 fozwdcrg h( 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 generatx)vo . 56;uuchb ss 7rvt;d4ulor is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output bet.l s 7vrb 5; v4u;6sohdc)xuu 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 cun - tykw 5y3zl0lgbx7dk2(q9u rrent of 5.0 A. How much energy is stored in the coil'snt9 l-l3 k5k0ugz 2xyy7bwqd( 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 resistor and an 181f6opf .ji-bi -H inductor. What is this cii-p. 1ojf 6fibrcuit'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 x+ h it)5bmrflvve/61an 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 intfheb47b1oj y* q gw99xo a 120-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. What is the resistance of the zz dw- 9bfq*e/u36m,yue dr,s lamz rs9-wb3y d*z,e 6mu fe/qd,up?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is c)+rmlca .4/jq cqcyr3 onnected to a 120-V ac power supply. What is the peak current t.lc4) ycraj/m cr+ q3qhrough 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.ybk8u o,z 6d1kg .at2-.kkzn s What is the power dissipated in ty autg z 6k1n,bk-.d2szo .k8khe 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 resiszl -91hbpczq7 tor 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 resisi87ordqt0/ qq3zw d,itor 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 resiwca n-5g 8g)3lbtf*- d4d5bavvm 5tsjstor 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 Hm:h/ oopl:j6v z?

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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 react-0dg zfna2f/ yance 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 indr.j;jv ukhzj *x+ /cj/uctive 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 inducti /5 mprji(6+u 8 jzcped5wbxz9ve 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 uib/m8wz3hs u3;b.sk *w0jb vinductor when 120 V AC at a frequency of 20 kHz is applied tom 0ws b3h;.*3vsi zu/8bjuwbk 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 to a 110-V, 60.0 Hz sour*m,6*eqmz mr ar;aw1 sah9 1kh rthi+ah-46si ce?

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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 -ehf,v+f5eb -- al pt9.nujry/g1o qtcapacitor 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 ha*8patg,m5hs7 v2vl+ (uea ls2;w tl lnve 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 haveei+ccr9 2pt64k3tkb n t+ enh1 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 capacitivz.rah:t4:+2 fgs u dshe reactance of a 0.010-mF capacitor be 100 W?u+h4rszat h. s2g: d:f

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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-m hpi.n80m-i),lt a vfwF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuirlhb z;:.w7 slt with 12.0 W resistance, 15.0 W indu rl.b;:7slhzwctive reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistortsoykcel2s6fj +r)5(3 l 1v zt, 20-mH coil, and 1.0-mF capacitor are connect5ye s2vflzcjr + t6ksl)3o1(ted 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 re2+ yfz-)y dof w1aez3n8etdc+sistor, 20-mH coil, and 1.0-mF capacitor are connecte12ec oytde- nfw a)d3f+yzz8+d 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 conne8g0s wxn0vf3x +ct th+cted in series with a 20-mH inductor, what is the im+shg8t3nv +xfxc0tw0 pedance 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, whi/1bc7q7jp5a m/fhc+g qa kz 7k6kvn8 at is the phase angle agpkk n7qmfb1 c qz/7+a5c8ik6a7 j vh/t 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF . x:o.d)dlpm.2o4 n :joqq bzycapacitor fo bz:x4n.od qm2o :o.p.qjy l)dr 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 need4;9oy 5oolnpued in series with a 100-W resistor and 15-mH coil to get a total impedancon5 p4y9luo; oe of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-m7 jr0w,gylqg. yyf8pql*5 5 kdH inductor at 5000 Hz for a total impedal,lky jq5 p*y7f5q8y0.dgw grnce of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series withwi qiwmhdh *vil97pwj3j t -+i,jd/44 a 100-kW resistor at 1.0-MHz for a total impedance of hi mt/ld pw*4 ,37+qjw vjij9iid-hw 4150 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 - w6 qfsi re;b3)kx:tbis the imped stkb fi6;rxb-3:q w)eance 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 h7c)eu8 xs j72rf ij q14 ewdwq9jwm+)capacitor at 1.0 kHz for a totalhj2 +7e q9wijrcw78 4xuq ef)dwsjm )1 impedance 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 1jlqw)i.tnfenw;v46, c7bq w oi:*3t c0-mF capacitor at 1.0 kHz for a phase angle of bvji)w 76q 4:wtiten wfl;qoncc *3. ,$40^{\circ}$?

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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 1.0 kHzwrp8 lm1,phf/ for a total impedance m/1l,h8pfpwr of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hzplm8, gntk cqg -s- *c0pu9k(m. What is the phase ap*9ggun(tm-pm, 08cc-q kls kngle?

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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 resiw zr9 zal))o9istor, 20-mH coil, and 1.0-mF capacitor are connectedl))aoir9 zw9z 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-r93e3zbjb r3sjzl v /l)s/hdjfd 2p93W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to azdb 33)sld r 2s3ej3/phbrjf9/9 l vjz 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 30rxz9:s f s t2+3ustd. dq1hf1v W, and an inductor of inductive reactance 30 W are connected1:rt f1fsd. tvqsx+39 s 2hzud in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resistor, w:xh- /wakxvf0 myo,2a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-H/:m 2, x-vowy0whaxkf z 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 r.z52fq9zjhn9 tlb 0 h.royb7e esistor for a phase angle of 09 q75z.behjnz 2bfl.t9 hyro $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At wha;81kl+j,wm c4* ltmno5yc ja nt frequency should the circuit be driven in order to have maximln+;mnja5cy4jt1l k mo, *8w cum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0:eev(a,*mu,hp /; ozxxxbh-y W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the cu,x-vhzobm:;a hep,( xe*yx / ircuit 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 tjd9l+hq+;tc, z4zl))z xvem AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a al(ye 0g5x2n 5tnjx ddq4 *g2qresistance of 30 W. What is the p*d2 gy(jln5axd245 nqqt xe0gower 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 RL/ej)3pjzmikdj y,- ,/cy*r pe)rdrm )C circuit containing a 50-W resistor, a 10-mF capacitor,r,z)),jj)k dm3mje -r /p/i d y*cypre 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+ys2q.a 9qsp sz. .m7ai3jmo z.odrz1 in series?q ozjpa1msmr+.9soi27ys zza. qd..3

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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-mF2y *tu2rl +s b7tmz7br capacitor for a resonant frequency of 10b2lm tz rby*s+27u7tr kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inducto7vp)n j1c aot(r for a resonant frequency of 1000 Hz? o(cpat)1vjn 7

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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 seriesytjz sjdlx7ht( kb- ; l/64pc3 with a 30-W resistor and a 40-mH coil if the resonant frequency of the c 3(y/k;spt6-4tljh l czb7dxj ircuit is to be 1000 Hz?

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