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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://autoconfig.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://autoconfig.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 obg)k5clxx 60magnetic 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 stagy :fnk+ v4aj ;yy7/7 pwabc/utes that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil prolt(lnd3if s:o-ec ,n *duces what kind of change on the,c e(ni lntd3:*ofs-l 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 ol 5ecc-iytqh h kxl:*4n(9 hq2f the magnetic field through a loop of wire produces what kind of change on *-yqihnk5c 2eh9 (lqhtl:4 cxthe 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 produces wt )u.tab d2(dthat kind of change on the inducttt2b( dd )u.aed $emf$, 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 fsr h5z/qs:z -hield 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 curr jci2lrxw/.j)ent in a conductor will be that which tends w)ijr.jx2 l/ cto produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar m(7d7 q :gz: jtom93eavp ac(z4kgfx x2agnet is held above its center with its north pole poi( jgq(va4:tcm3zeax9 k po7g:dxf7 2 znting 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 magnet is held above itst7xcc;+ wxol * center with its north pole pointing down, and released. As it approacc+wx7t; ocx*l hes 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 )e uo ifemn8+-pdg9aa/bu) g 2a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the fi)aup/e9mafd)gb-2en+g8i o ueld 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 regb (4tsgo y6oy8ion where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When vie ty84(6yobg sowed 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 horizo4mly g us;w1i*ntal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. Wh4uyil 1wsm;g *en 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 b0- q *9j6gloz)eb cexon a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side-bzb*qlog e90)x ecj 6 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 loop of t 20o9 vmcw+bbwire with the north pole entering first. As the north pole enters the wire, th+0otv92wbb mce induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis w: 88tkwk:g+a tsgg fl6hose direction can be varied. In a region where a uniform magnetic field points straight dks:g al:ft86w8tgg k+ own, 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 angular speed about ami :*z oh1x+eln 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 a xe lohi*1m+z:xis 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.m e)1ly iqn3ghn(z 748ilkg a9
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that an n6+g1 c-l5pa9lw rkpr$emf$ 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 magnhn9,jhkvjyrw tz39a /+i *v:m etic 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 th,(ym px* vb-x8ep p*nte east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Mt(p* 8,vp*p-xme byx nake a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular-;lqm)*6u swpo coe i7 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 t4nizex4n*qh-+gm( cp ransforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotata cu)cc1(nz cyi7 0t:ies through 60 revolutions each second. The frequency of the): c z(ytaici170cnc u $emf$ 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 use-- - oughuvx9qd 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 thftu)ltwq 1.jd8*v v s;k/y(jb 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 sec (fd ;e(trc-ugondary coil contains more loops than the primary coil - ( (guetrcdf;then 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 primary coil contains more loops than the secondjgb kc(s9-*0,y0tjr q* dccr lary coil then it ljd ,c*bjgc cq( 09k -y0r*srtis 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 powerdxqfzdox9xbh7hwo/,o3q44 m j3o2t . 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 circuip4t69utvmkc ep87 s/xt,

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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 xcy6,m/n y, z,pzf2nz are connected in series to an ideal battery of constant terminal voltage. At the moment czn,f6 myz/n2c, p, yzxontact 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 seriep6bszw 2ay r4z31c f +ndp3wf0s to an ideal battery of constant terminal s3 6y4w +cz1f a nz302bfdwprpvoltage. 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 qxvl+h74 a6gcv5s 0kbwith inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the 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 resistanmsmpen l8,ld l924f,ece 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 col7 -(iszu92wir i 69nvve3f2x z d4uuru;mpw/ nnected in series to a battery. The time constant for the circuit represents the time 9 4u3dn/e -v ziiuwzr x;i(72vf9rp mw6u2su lrequired 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 sex rjys(s21m2j ries to a battery. The battery is r21x sjj(s2ymsuddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the samt9s (,rsn k 0wsq(3qlwe 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 connecl9 ckd/, sv r)yj4yyi(ted to an AC power 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 an AC power supply. In this circuit, thghm/m69p5z23ajnt o i -gaiu3e currengnm3h mjpau/i g z6i5-3t92 aot

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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 fqk5 qlpx)-ww )actor when the frequency is triplxq -w5qwkp)l)ed?

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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, t*xhx:hepxh:c3 n8k*w) dk cp5 he inductive reactancex3khw*e:xh :ckn cdhp8* 5x) p of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC .tqb;:;dni m avoltage across an inductor approaches zero, the inducttn.bm;a i;d:qive reactance 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 th0y j 7vjhq ntl2u,11swis circuit, the current,tq1 70njvy uwh1ls j2

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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 93buea r ,li v((qz:zr/p mce1qxdq( 8an ac circuit changes by what factor when the frequency is tripled q9(c(r1e(ia zzvmrx qd,l:qp8 u/b e3?

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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 o/jkk(:ox r(azero, the capacitive reactance of jxko/(:r(oak 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 thlgm/j2d :fgk /e voltages of the inductor and capacitor in a RLC serij/dg mkg: 2lf/es 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 n3 g(fpp4/rf- toylm/ is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increas. 4mkwqfhujh-y*wa6 8es if R increases. When is this statayhw64um-w8f*. q kj hement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedgogk0 p94v or8ance 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 impedance of the circuit ic k4b+6 qc/ owbi ttv 6arif()ji3n,d9ncreases 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 capaciv9e: l.4 .72mprc;t qiac)y jw(ggfwitance both double in an LRC series circuit, the resonant frequency of that circu(4 w9iecywq.avt) gf c2;jp g:ir lm.7it 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 dr7z(b)u-/ k hlgue+nmkiven 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 circuit occurs os cmht62w5nkub6+ -swhen

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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 rotatingdjblqy,9c o; 5 in a uniform magnetic field of 0.20 T. Find the magnetic flux cd9,ojby;5q l 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 radizn+sa7c24 hn ltmy i6.us 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux throughn+ih l yz764tsm2 .nca 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 rotating in a uniform magnetic fielwnj+,0e7w* +wtp x lhmd of 0.20 T. Find the magnetic fl0t,*w p7+mlwwn jhxe +ux through 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 :*brh*ws* )+smg14u+pvtzpvsp wy9r 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 coil cha nh8r+mx5z)dknges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a szgt+z b/ee) ,dquare frame with sides 18 cm. A uniform magnetic fietdz e)g+z b,/eld is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 1ui,ym/ 9.dnzzcsn*q*1spno9rt f 2 d35 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 tk (o:o5e lzo+and area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location where thja+z1h6et ze1 tqp.je.e; z:we downward component ze1z.a+6z:jjq1e. pt ; htwe eof the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angulm 7w bg;sqo*m o3wowj3)oa.n .ar velocity of 2.0 rad/s about a vertical axis through one of its endss. o3m)ano *7o oqwm.j3;wwgb 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 hazq66 bpni.25 9c y0zpqqepiu;s 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turnsj 0ue2(omnj54 (jhyp n of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop ,hdj tf27r,grz x4rp-is 12 cm long and hrjrz72pft,-rdgx ,4 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 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 turns of wire of areas-.-o; fq h fpo 8int-:ndqw.i $0.090 \; m^{2}$ 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 genext55 v,h2c5rwcvnzn qp 3; -hprator with an output of 12 V maximum when ro3qp 5n2vrxpv w5,zh-c; tnh c5tated 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 maximum.odw sa4) 88nlq;ei g74h tfvr $emf$ 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 mo1r4iljpz6 uh0 tor 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 f/ zvle:r5h e8kdq 3tnrr6 g5:6.00 W. The motor operates on 120 V AC, and when running attn: q8rd5 rl6g53zh fee:/krv full speed 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 resista hj7b w2q4q7y)u*i svlnce 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the startbj)qs* lwu h247 iyv7q-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power suppoi21kh(a *ly5x6 xv .zn) sloaly. The operating current is 1.0 A at full speed. What is th)zhav 6k xs *1o5nol(x.2yil ae 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 6.0hr:o*gnsu ; 2l W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. 2*nrolghs :u; 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 transforwvtay rrw,v+ -1+pxx.57og hae j0nf7mer is needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn pri: k8svbcj ib3*,:ssqfe*r h: jmary of a transformer causes 14 A to flow in the secondary. :sb,b hejk * ci3v:s *fqjrs:8How 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 prdshmrah2qil );3l)c 1imary if the 24-V secondam; c2ri) l3aq)h1dhslry has 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 59*x.m /qpan z;ee8ymasuq.z600-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.a* 6qqp u m8. y;xszzm.ena9e/0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in+bu;mz1l4 9ss eywybb .z(q/o the primary of a transformer. Assuming 100% efficiency, how zwlm zyb( 1s e+9.4b;/sobuyqmany 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 transformer provides 7500 V at 10.0 mA. Te.r ndu ps-h(6he primary coil operates on 120 V. What does the pr6ud-e. nph( rsimary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil atlu rz5lgfrfku to5 02f15; gz:z 8)hjnd 300 turns on its secondaryuzlf k1fjl5 tr25ztfrgo 0: g u;8z5)h coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on itsvu.sdw 4jt9l91k(cdcg.lei 2 h-bg* z primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current i*gdv.- lt d9e4whl.kjsg2( 9 bccizu1s 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 seconu bevk k yfb8, z)07)/-kufsbtdary has 200 turns. If the input current at the primary is 100 A, we can expect the output current atz80 bke)ut,7b sy/kfv) ukfb- 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 h;zp2jip 4yz8 has 100 turns and its secondary has 200 turns. If the input volta4p8p 2 ;zzjihyge to the primary is 100 V, we can expect the output voltage 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 secondouaa6a8s g2a (ary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (negoaa82ga( 6a uslecting 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. Tllg2bwp c;1aoq8nq8td75q6 f he voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistanc7w 81l tfq;cq8abd6p 5gnoq2l e 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 12 akb -r1 fkvr/;4hnxs*0 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 lsrh-;k *4x/rbafn1 v kine.

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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. Thez**loza4b7bl ,89oi mrq zc6 f;yp*cy voltage is usually stepped up tolycm;7z,i8ra*c**pyzzl9bo6q 4bo f 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 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. A geners:7e/; .h-9i fgre axgaqnz3mator produces 100 V at 70 A. In order to reduce energy loss due to heating of the trans7mg-;e:irqgen9 fx/ .hsaz3amission 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+q6ds8x,buzv;:a f o r 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 is lost when the transformer f:bszu,rad;v8+oq x 6 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 erg8n sh:7qz*x /tkse22f; tv 1000 V. How much less power would be lost if the power were transmitted at 3000 V r8st:hvg;/zfxtee7k 2sn* q2 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 transmi5 a;rht xx56wiigqkc*d8ko8 3 tted 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 ixcw 5;ogt8ki8rd*h3k a5 iq6x s 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 much1bfi0x ;eip 5q energy is stored in the coil's xpqb5eif 1i;0 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 18-H inductex0 63 rzr0tyior. What is this circuit's timx0 ry3e0 zt6rie 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 circuitr//.hkaokts a(uik.2nc 2(h7vxoii dq qi ,22 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 120-V AC outlet. What is thcj(zw8ic+ oh 7 ve:bf7e 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 resistbrea r28w v,krnj3 x61ance of the la r8e63 v k2axbrwn1,rjmp?

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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 a7g)y5:abkcfc9l h1k 0tnwt +w 120-V ac power supply. What is the peak current through the resi7: wt 9tykbg0whkanfcl1)+c 5stor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is 60/.zto(yukzi. p8bcnx. qt l the power diss/znk..( yb86upztql xctoi .0ipated in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50r43r1xvr rvhmku-/c4omd t(0-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-gc6 drcx ;f9+zW 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 xd b-6 lp7 tr5,p8bkbfa 50-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 reactance of a 1.0-mH inductor at 60:xi4r+7 lny z2l icf+c 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 ayjs6 1fbj/)i0w; hf v (t.wthv:o)rey 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 rea me:owj,ab n44 9wz8lyk2n 4zuctance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is nece 3ngz k*1 zp2n 0:c5/govmcgbqssary 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 ip-a *, eo1bnvr jc8orb8*dn;xnductor when 120 V AC at a frequency of 20 kHz is ap;cpan x rd1ob-*8er* njv 8ob,plied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, gqe 3kqcwolh-( n833uu-.hti9l x3wy 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 capacitor at 10 kHzy- h0gs7w s/vzlf sst9* jt(v.?

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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 am jhvi9g *l;2reactance 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 cackxc 3e:r2j (xpacitor 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 capxmf(7h0 f1r24j6 503oyouf tgyrhxgi acitive reactance of a 0.010-mF capacitor be 100 Wt(6ri 0yxo02 yj 5 ghfo43m rghu7f1xf?

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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 as,qxjfdk9* ju /6i9l oj a+y2bnd 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, 1 /rweb;; oa 1pgxgth4ae7 3m;sy d(+bn5.0 W inductive reactance, and 10.0 W capacitive +/h41 bw;7natoyes( e;mbxg;pg da3r 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 resistor, 2+oq 8hst j*nk,0-mH coil, and 1.0-mF capacj,hsotk8q +*nitor 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 coilz4sy*ju xct )), and 1.0-mF capacitor are conn)zscy )4tj*xu ected 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 k6t0 ogt2+bv9j)uoy qinductor, what is the impeduoq9bkvg02t+ )o6 t yjance 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 is7lh d um..fl,oh;i,m x6rnt-h the phase angle at m.rd7h .fl 6tmx,ihl;uo n-h,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 need6h*h r8wzoa.b ed in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impazwr o.h*h68 bedance 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 capacitgqzu ma7kp/ l,*w fqdbh4(q,q,/ )sihances is needed in series with a 100-W resistor ang)hku 7z f/m(swaq q, q,b/d*hi4,lqpd 15-mH coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a t0 n41j*xkm4qtek e*d-saa8 m 450-mH inductor at 5000 Hz for a total impedancnaj484 *1 *katd-eqksm me0xt e of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for a tokasux/xj eam 1o yu7 +b*(z.ld80 .taetal impedance .0y k(ebuala1ezu t/8sm+ oax7j.*xdof 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 2k/tx32,ezhp6*ga.)ufjy f2gd0hk * yzo at 6j0-mF capacitor. What is the impedakfxz a2 jd*.gp)e kf3u* 0o2,/htz jh6ytgay6nce 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 capacite5d 0)1 qc3yyw 29vszflfz bn1or at 1.0 kHz for a total impedance ov31n0 zl z2cwf5qy 9yf1)sebd f 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 apr8o;1e/0l egp 6nzvj t 1.0 kHz for a phase angle; /ge vn6pozjl1e08rp 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 1.0 kHz forqu fhbf1- w;q; a total impedanc;f-1bquqhw ; fe of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is teo2-znci58xaje) 9 eyhe phase angle9y-5e eai2o x8 enzc)j?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20f m2 y :aef8l p+wc3z4yiqx7u-5;csjf-mH coil, and 1.0-mF capacitor are connected in serf x;a7:f+8fwc3mi us-cp e52j lqyz4 yies?

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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.::rc5*i- g ixmsoi5o m0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. xgm*mi -ro s5c::i5 oiWhat 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 capacitiv6 e:g*k*oduftpt8j7 ne reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110 dp*6tjg fot:un7ke8 *-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, al9 eazq)lc-vdhj uo// h;kgtr2*t v., 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hza/ rgh;/-cqljt.)uv dzv2ekl, 9o*th 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 50 r559uyxha q8j0-W resistor for a phase angle o j5h59q y8xaurf $40^{\circ}$ 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*vtionif1a8eo mkfg u2+i8n413 . uas.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order tom2f88niuns avu+ ko g3f ia 4.eo11t*i 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 with 12.0 W resv4 iot9 i;up i5igod;8istance, 15.0 W inductive reactancg9vo5 ioi 4 tupd;i;8ie, 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 6xy 109(ptrfcs c:ie dAC 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 (1flu +*waoz5 0vucd4s4 cp zzresistance of 30 W. What is the powc 4oz4fc1zu+l s da 5uw0(zpv*er 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 fo5im.je c/dg-47kz:cidr dw2/e9re opr a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, whek zd:jir c ec 5/o-dw grp4e.e9mi27d/n 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 e5d ,7stf 2,*s m-pxc9ukcbnm1.0-mF capacitor and a 15-mH coil in series?c9f*m u,k,c2dnpbt5-essx 7 m

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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 s7x io hflwy 1r61d+-o4.7-mF capacitor for a resonant frequency of 10 k6l11h rsd fiow+o 7x-yHz?

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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.,m wx du1ug blq0-gs8 in series with a 3.7-mH inductor for a resonant frequency ol-,u8qgwsgb md .u1x0f 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resi(p0s99xum 2sda0da 1.ufld-yy hz j4tstor and a 40-mH coil if the resonant frequency of thl-0dhj1yptsmd0 u dx fs4a9y9.2u z(ae circuit is to be 1000 Hz?

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