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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 of magne, uh-y.2; nyg dolkxig 6ju)k 5x,qp-htic 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 st3z6ilfr4a;3*m dvqxkj - 16 ( xmsfthfates 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 produces5nuy* z(dx+ yyvpu++ jxz,. pm what kind of change on the inducvy+ jz ,yu5+x* p.x(dupy nmz+ed $emf$, 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,o8tqm( jb3hy field through a loop of wire produces what ki3(oqhjtb 8m,ynd of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter oft.p: itfr ddjt:( 8gt ,is7x6c a loop of wire produces what kind of change on the induceddp gd:,ixt:(ctt tf7 .8sirj6 $emf$, 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 ma4joilcx v u00)gnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in 6,fg2 s: w/-cituup l.w9urvla conductor will be that which tends to produce which of the followirc2:w 6uf,u.v/ w s-9ug ltpilng 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 above itz)cd),)zamwpjsgw y 3w8d97a(h4nzxs center with its north pole pointing down. The stationary magnet )4zm))xn7csg,wa d8j3wyp 9(h d wzazinduces (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+93cu e1les lez;e4j 6nuyb8v6h ipd( +zk0qm bar magnet is held above its center0lj6m8 ;ed+1h3l+9unqb s4 v( zkzeipcye6e u with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a tb5hs jjuux :s v:)1tk/able top in a region where the magnetic field vector points straight up. The magnetic field vanishesj::sjh5/u bxus t)v k1 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 where tu 50tpts)7:v, jvvd ukhe magnetic field vector points straight up. The magnetic field sud:0)u v5tjpvut,vd7k sdenly 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 m4)g lk- lcww(;.re1 m wh(jintagnetic field points strw wei. mh1ngkw cj(;-()lt 4rlaight down. The magnetic field disappears suddenly. 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 horizonan*c.x rb 2 y0q0ahs/ntal table and carries an ever-increasing cury0*0/ ca2.xqsrbnnh arent northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the norux -r/(lsjlu5 i/jvpp* m nbz62b*nt ,th pole entering first. As the north p(lunv/t-n /rjupbibsl65z2j,* x* m pole enters the wire, the 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 axisg9k)bj)(14ii ex jl lo whose direction can be varied. In a region where a uniform magnet kb jil)l9x(14ego)jiic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular spe 47: /yl p6 degjgisg.w4qxs.ted about an axis whose direction can be varied. In lwp.g 6:s/.e7qgj 4t4i dyxsga region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law. ow((c.;7k4;ymdpuki l, fw db
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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 thag fo3x, g1xhl7t 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 magnetx/3c6d7 s5tr w-gzj.9,jv;ogyvu t7u a )cle yic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is mns zd38fw4q:- k1ktw 7 q+rk ip,n-ekzoved northward at constant velocity through wq fewt+z-q,k s:k8i kp nk714nz-dr3 a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular velocity 6w6 sk eq dd28(;yyqzou*lwh8 $\omega$ 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 transformxsrg, :)3k a leh/db2fs

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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 throug9 zk 0. yr x8vei 0dbuo2(2xcu;ei+loch 60 revolutions each second. The frequency of thx 2el xvdk20r(. uyoo c0uie9c i+zb8;e $emf$ 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 b -z ,9wvwl2wqto

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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 device5.6xos z0qmg5cdv 8*nhjia.gzo c:6d 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 moref+wxus5772 8lt gntfn loops than the primary coil then it ixgt2f t778+n5wu nflss 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+c x u:v*uop:xl 0c7b6fpd fe/ the primary coil contains more loops than the secondary coil then i/f :6fue+x coc: x0 pb7u*vldpt 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, tha6m4i x yqep,f/5gci2e power 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 circuio r h,1 b:zea4:umwm c)59u rr*vmj;cmt,

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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 c xoofg:t5m-msht6t3fh37k) bonnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltag36togx :m kts7o- f3fb)5hmthe across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of ,yh4hd;es2c s9n dg-yconstant terminal voltage. At the moment contact is made win9g4h, hsdecy ;y-ds 2th 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 ag::d tbm6 ,v ,yb0plq93rvqsmnd 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 resist:w5 06 qrrgwus)+tuer( jssh4ance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series)c3vrzg21aon,* c *fuov,tjy to a battery. The time constant for the circuit represents the time required for the cuf a zgcvt,u21*cy) ,onr3vo*j rrent 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 conneb2 ,gwju +an2 r:ca2gpcted in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuitgwjrcp u,:g2aa2+n 2b 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 sam1 hm0qy xcj71pe 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 pows;. 7havu9k an9fp.0js hy hn-ou/ v1ver 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 cve0( wp .n-em9yid5+rs pfs 2gircuit, the currenr 0dspyemnp -2e fs+.9iwv(g5t

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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 frequaef2s2z j :a89dhp ;p5gb v6wnency is trdb 965:2s28 azgvwpje;hanpfipled?

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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 doucq3e jsx n,e*k8i;5 uybled, the inductive rec;5i j *qn 3use8xe,kyactance 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 voltage across 3-/n/otn31z(k, o oskmmbqpk an inductor approaches zero, the inductive reactance of ttmqn3oop/3k n1m,(kb z k/os- hat coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this cir9pi.tv. e tq;qcuit, the curren.ep.;qiqvt t 9t

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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 what ; si 6u+)2 2qdcp1/j,-romddkq sjflvfactor when the frequency is t6si1kqv2m-+sqc/ ud;p,f ld 2rjjo)dripled?

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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 capanxzevl (jf;:3citor approaches zero, the capacitive reactane(3;j v:lfx znce 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 angzxq i0zvg ztm*;6 t/w4le between the voltages of the inductor and capacitor in a RLC series circuitvgxq*m60iz4 / z;ztwt ?

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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 w2dp, 3i/spi *pu- hclas $\cos M = R/Z$, 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 in 3 v5rohu;oxe)creases.o u3o5;)x vehr When 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. The impedance of the circ 7g8sfu,cxa 5nr 7hg,an /*umluit 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 imped .9sw2zo-wojdance 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 doubleq h.d a 3u4xlbcjcu,)53x) syt in an LRC series circuit, the resonant f q.ccl )ub xhjud)x53y3t a4,srequency 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 A+ ka0rv6 aln5.uvkds2C 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 occrf6nz*7ei9z s urs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a unifor(,k3 r+ppm wwg5r*,i;scycv (5rlbrbm magnetic field of 0.20 T. Find pclir+mgrwvwbrk5c,5 r*(s(y, 3;bpthe 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 rotgp:cor82go u / o2:mpc.3y iqj;pi8kz ating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop whemp. cipoo8ipc j832ouqy; r: g/kg2z: n 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 ineu 733g.xl l)q;,ze dmr-wtzm 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 al m,w3t 7m3;dzle) qugz.x-ert 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 ad jn5i)8x8ieyg.w5a9id j:iosjustable 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 changes +z jbrg+2r w8pfrom $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 c vc7k atfu9-5gm. A uniform magnetic field is applied perpendicular to the plane of t-75gvk9tc fauhe 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 xiunmj eg/luiv 5i3x1. 6xck 3;r4;xs15 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 ando lh-cko 5wsa2tai0/, 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:pw,sto4+nx0 j3e d aq(lvvw1 where the downward component of the Earth's mv snl4:e j1qda(p, 3xt+w0o wvagnetic 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 aupqvw d485 5ex constant angular velocity of 2.0 rad/s about a verp5d48x 5wquv etical 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 and a cross-sectiwbmkwzfn9. k;;;w u9o k2 vnv:onal 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 wire of ar,0 kw-iv pexp.b8mv+u ea $0.090 \; m^{2}$ 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 rectanyfq4 6 1ebfitvcxc 03)gular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm abouec10 6c q3)4vtfiyxb ft 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 of5ibnihy(kw *5 wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generaz* xo 7p/h -rno aj,jbp-g s:7ozf*)xptor with an output of 12 V maximump zbhjonf7:- p,o)orj-/ *7x g zx*aps when 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 maximmo2 )3w aij*yf c6uk2uum $emf$ 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 m3var y:zmpg.jza us m k7(y+ );2fxs n,e55ojnotor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor oh6lnj8dc 0jf4nq7sntw6l 6 u0perates on 120 V uhwt sj6fcn6 qljn70d0n4l 68AC, and when running at 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 resistance 6.0 W is connected to a 24-V power supply. otuv1agg;n 9, : g,cniThe operating current is 1.0 A. What is the start-upg9,:cg v,guon;1iat n 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 c ,d yyvf;.3,cw xwngd+onnected to a 24-V power supply. The operating current is 1.0 A at fullfgyd3n;.+ycw dv wx,, speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power suppj,b/ 6vlrp 8sv0t 2ehwly. The operating current is 1.0 A at full speed. What is the,2vs j e /l8bhrpw0vt6 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 needed to h,+;hceb2hygty;wds ) 8r h +preduce 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 1fu* msxm6d2w4op/2 ep 4 A to flow in the secondarmd*p6w s/moupx2 42efy. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns arej3rt wn v9qowj69ilhn 6)p;,e necessary in a 110-V primary if the 24-V secon,6)en6nji3 ;w oqjv pt9l wr9hdary 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 uo(y)ba 2er+n a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 Aayunbeor(+2 ) , 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. Asa waqg.cr:g2r5;mo m3suming 100% efficiency, hrra g5w;a mgqo.:c23mow many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sz6e ix;c2r f8pign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary f2r;8p6 exczidraw?

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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 - zdu.iv 5vx.u2jb:xuvyso aq (9,b /nturns 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 ixu5j9s yviz xdv.: b/uq2v(-nao.bu,s 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 tu.dwl- dt10 q;kjmmga ;hfuy 13sdw86mrns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what ky;03 mlgwh-8ud qjtwmd1 6 s1.;famd 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 ha m5d 024zyexw ya.9iucs 200 turns. If 5yd 0ew.m2 yizu9xa4 cthe input current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transfow:jdt3f (is* jrmer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect t i 3j(jt*wdf:she 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 itsn )v09xi dzsh6:o:8bq8sk kue secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to zxs hbik:s6n)d9ke0ov8q8u: 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 1y b)5( pfp;ccmd c)v9x20 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resispb y5mcfc9d))x c vp(;tance 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 Akc 75 k rz6r).oex,9eqqnlzp7 of current at 120 V. The voltage is usually stepped up to 4500,zk7qxe. cn )95rrp6 qke7 lzo 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.

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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 curr0lle5,ccsbuc6xv. fe, ;u c(gent at 120 V. The voltage is usually stepped up to 4500 V by a trancvc0 u5,6 (c;ugxfscell.e ,bsformer 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 tota)xsy0pmlgb5 t- .7bwsl 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 volty70xw .s b bps-5)lmgtage 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 vd:g dw 53a6*h1spp gz50 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 heatida g:hsgv631 z5wpd p*ng of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power wouldjdy tt*i(.f) wmu)8 pg k3n,tl be lost i3) ttwtn,pmdl*ug)fki.8 yj(f 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 on0q:+n4wob y fz3bnwc.4e qggzp* e2 e+ a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is no2wbpn bqgyfqec*w:ze04+o3z +g.e n4 t 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.oql/x4l6zg9ahc7keu m6 p 2 n A. How much energy is stored in the coil's magk/ch66 p ezol2. xm nlu9g7qa4netic 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 indlz6 w89pd fzrzph*((k)c egaxp 3;/yyuctor. What is this c(pl(p; )rzx3kfzy 6 dhaw zypg 89/e*circuit'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 Atb )uug pjpspf(9s3b7cb +s+5C circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is thel ;2ztvvn((qs 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 1yh: frdy/;9peuon m( -20-V AC outlet. What is the resistance of the lampm -:ufyoh;pynr/( d9e ?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac powery1kmq ,rwyy);idx.0t ff -y; q supply. What is the peak currenf 0ymkqi;rqfy -, td1);ywx.yt through 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 *ai( i/cbmmy1jwu/qs *:txk,. What is the power dissipated in thexs c,qm/u* :bitm(jw1k /ai*y 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 reie,c0oqhb:-p cr(my hp y413 ysistor 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 re w,x a: 1phc4m:nr 9bj6viihw,sistor 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 t xh xbup94qn5bfx d (gt3:a:550-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 asrm.)h*i9ua.wbfr;g4 ox; tv 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH cokz mddx6ls9g54k ( jtp4 hyy c.z6)xf x280cvxil 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 induct klu v;lpyk620ive 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 fornz.2asj vco:yw8fv+ b*v7y4a 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 in1a7g f9mp . r/oehegn7 a 60-mH inductor when 120 V AC at a frequency of 20 kHz is apf7 p g1eeramo.9h/ng7plied 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-mHha;kh-u2 w;q u coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactan3z++ byuz,:u(yf fir/ida cl+ ce 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 have 50 W of capaciticz4iq d+(o zsd lsta(6:y,)hod:w3ir ve 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 doesl-,t0 q9quxur) ;nbcg a 10-mF capacitor 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 reactance of a 0.010-mF capacitor bed 876ee wkihi; 100 W8we h7i6i ekd;?

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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 yzav5.w.w6ib.0010-mF 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 impedanc/ tyc1 oik5q3 hpkabs92p*g6teio51 je of an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 pyb32oecp ah1k5gti t9qsi5k* 1 oj6/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 resistor, 20-mH c)6c/eq:xc tp ,zfos1g)k ub1poil, and 1.0-mF cap6s)cbcg:pfxk /)ptou1z q e, 1acitor 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*.c-l lw7 my3r2c 4d2bm qe. /f(cglk7qrucoy, 20-mH coil, and 1.0-mF capacit7 yq w -4l2c m7*lu(k/r2oglbcfrey3mc. c.q dor are connected 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 conne*przjgzjc 6;km2/c 9r cted in series with a 20-mH inductor, what is the impeda /6*zrzp gc jcj2rmk9;nce 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 serie eq2ktm f/e7.cbt;ym 0s with a 20-mH inductor, what is the phase angle cy mk/f.eq; 2t0m7ebtat 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 serie.,) wrfm lusx2s circuit with a 20-mH coil and 1.0-mF capacitor for a to2xms,wl f ru).tal impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in seriw91fve+o3ot4f,9z lvap 8 rn yes with a 100-W resistor and 15-mH coil3re+9n,a8po1 of9 v4fzwyv l t 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 450-mH indu1 ,n1psn j *) xdeyao:h8kmap7ctor at 5000 Hz for a total impedance ofjd* ,akx p 71o):n8pen1ahys m 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 seriehsy: ru5*ek 9smjo6,x9 2n wxfs with a 100-kW resistor at 1.0-MHz for a total impedance of 150 kW jo,xhr9 ysuf 6e9*m5kswnx2:?

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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 cjhvf wbn8ex79- wv 2w)onnected in series with a 20-mF capacitor. What is the impedancen2 h-je 9vx vw)f7bww8 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 capaci8f;d ouoh j2)z9 sh8ghtor at 1.0 kHz for a totasj)u8ho8g2h od ;zf h9l 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 serierqzv*m+gu fwmb31e7m8g,. 9(wv qd lfc6,sqes with a 10-mF capacitor at 1.0 kHz for a phase angle omqme3 1 l,wrc(bmq67f,.8 ev vzs9 *d+ufgwgqf $40^{\circ}$?

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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 resish zh ol)0as4+sqc6 kl(tor at 1.0 kHz for a total impedzckq0a6 )+h4sos( hll ance 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 seriesr(n q*tcq6 ua8xp 5ix:z.5ywm with a 100-mF capacitor at 120 Hz. What is the phase 5.zqx*r q6 w: 8xcy (tnimapu5angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and h(tcty 5h/ rc//lc :scntg* f4;o/zw r1.05/ nzwrrtf/4:h g;*hcyct(so /clc/ t-mF capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of 4rk.y 9; chezw ti +5m7k5lekxa 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms cue+7kz lie.ym r5k5h 9tw x4k;crrent 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 capacitorga.tw93- ldp b of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What cublda93- wtpg. rrent 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./je ov)3c3bc y 4xqxa 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power suy)co/ xva.3je qbx 3c4pply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase anglee8suqctsxz,.y dh /qh f6693x ofe6zxq/h3u,9dst8 hs y.f qc6x $40^{\circ}$ 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-7p/ q.0gpy9dmbkdiz = 10.0 mF. At what frequency should the circuitipkg d-q./bmz079pd y 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 with 12.0 W resistance, 15.x-wvklb5/tbh .v 6x-luo6vo + tq.zr10 W inductive reactance,o u- 61+.v lwbv/k6q-xrxo.zt5bt l hv 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 Ayzd w.e e 265 o3lc9ahkqpi9dum*d43lC 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 azxcd.v3 4g :ug fgq;k1n impedance of 60 W and a resistance of 30 W. What is the power g:c 4qk. ;g d1ugx3vfzfactor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W rec8.kov:rj n.qckok;/r cs,e+ lz( 1sysistor, a 10-mF capacitor, and a 0.45-H inductor, who8 (qk:;rrk+1cs.yczjk,ve /n o lc.sen 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 mzf/. a*ab n7 epjt.ag) )uzv6frequency of a 1.0-mF capacitor and a 15-mH coil in series?ag.7m)* ua/avbnz pjz)f . t6e

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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 witi,y:moebfp+ w. lvj ;;h a 4.7-mF capacitor for a resonant frequency voijlwb . e:p; yf,m+;of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a xd:dkam3 9s)s3.7-mH inductor for a resonant freque d dxm93:k)ssancy of 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 pbhf a4wrdc75 +84koe5oplwvnw.2 c.a 30-W resistor and a 40-mH coil if the res7woc.8na p4vph c.l w 45ebkd wf5or2+onant frequency of the circuit is to be 1000 Hz?

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