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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 9*8tcf0dyehgx1 5p nn units of 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 ind 7 miw.iu/gt9grh(x3 iuction states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces d4 hr/gfia/c:what kind of change on the inifr d4c/a/h:g duced $emf$, 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 fi5f5z nx1vjs 9weld through a loop of wire produces what kind of change on the induced vzf 5 wnj9s15x$emf$, 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 o3j 5 v/)usgcwlf wire produces what kind of change on the inducl wc3)jg5v/u sed $emf$, 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 fieahj-1njw(omc 0 dx8.hld 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,(ycib : n.uq:2qg5xo k the direction of an induced current in a conductor will be that which tends to produbqni5c:q (okx 2y: g.uce 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. Asp.,s0eqz b+ j,,e nec bar magnet is held above its center with its nortb,jz es, .s,0+qc neeph 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 fl2o2 vtx9c1arv 13o9 w nqxr*ivat on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from tvc29a qxrowi3xvn 11*ovr 92above)

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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 magn)42 *ajqd8k ane;sk bkz) sg9-1xhqdretic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above,sz bked8 -1xq2jga)rkq*)kndh ;4 s 9a 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 theg3mj yr80yb6(*a mm;:1 eu heu 6zvagl magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the e6:r3ugauvz (m8yh ml0;m*g6 a1jbe ydirection 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 h5s5yx6mq 6r; g6e duaa region where the magnetic field points straight down. The magnetic field disappears suddenly. Wha 556u mx;dh6ye6rsgqen viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an eve )yj2r3asy; ufx)(-br jxdtq5r-increasing current northward. Two coils of wire lie flat on the table, one on either side of thu qyrr jxs x25jyb( -)taf)3;de 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 north pole e()yid) -hscg4l ojtnrn+ ng.-ntering first. As the north pole enters the wire, the indyohn d(-+ )jgn-i .tlnsg)rc4 uced 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 spek;dwult ax 8zw )6a+-ued about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation owl+t6w k-z ;ax)a uu8df 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 wirjq(y sh2do) c+ocu6 9mvt eo4ev fv;)5e is rotated at constant angular speed about an axis whose direction can be varied. In ccf v69ov;eso hut )qj4) 5(devoy+m2a 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.+qy 6/3ze8soy oyc u px,(gyh.
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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 tfz0k 9:12 mmbm2wz1ltpx:pc mhat 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 m7f;p*bhx5 aev n5+spbagnetic 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)(dm0 8gvtn fy m(0f2g2euu.ue is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning tv0 mfmee(u fu.g82ndy(0u2 gthe 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 hgu-py6 /p q3pangular 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 generatore f,3pn ek8/-/wpgm0, b d3sm fggv5sw transforms

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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 second.wj 4z*3o: ,ygxvimsu /sktrv5( r4am 5 The frequency of tjvkwmmz(55 :4sx3 r,yogt*s u4v ari/he $emf$ 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 usy)io n4vp;8qy 6 )gowt*9mu0tgb cp(xed 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 devi+(t+ bl0iysk,pnz/ z yce 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 secondaryp -n tf:xhynvrp4hkm4+ 3q9 d.cki i;3 coil contains more loops than the primary coil then it is a3r:9k4hhinxic -p n43ft+vdp q;y.km

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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 ec ksl+ (y.0 byxikn;4contains more loops than the secondary coil then it 4ski.klx+c0y(y ; e bnis a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power ivfddzw0(6 3 hvnput

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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 resonan (mzd6 w2y ;jbs-k61eddhqbv 6t 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 inductor are connected in series to an ideal battery +(werya/ z q3lof constant terminal volt/l(wzy+q 3raeage. At 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 series tojb+as -y(o 9pfxhr9n/ an ideal battery of constant terminal voltage. At the mofo + yr-a9sbphn/9jx(ment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with ind 3: ks6ayxk8;ba3fqn-1 fv ovxuctance 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 inductan+dh lfef.9*vf ce 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 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 inducwm9dzxve3/i3 eojapl 3/k5 l)tor are connected in series to a battery. The time constant for the circuit represents the time required fo3/e)jz5a wp3 v /ol 9km3xidler 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 series to a bat zn(*u2o 3ua, iaga+yhtery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the a unz2guaiy oh,*a+(3 current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units excepjmb5 1) + 3gopu kipspd,q1jy-he-o4pt:

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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+ zugne)f1-lo9 ra:(itbcz2 c 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 -2*c v rf4e sa t6fnvoyle.)z:this circuit, the current:za yo-tf2r ve .vcf*6ne4 ls)

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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 nh u4e4 spr,8djl:w0a by what factor when the frequency is tripled psd aj,h4wr:nule 480?

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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 acrosa(dga6 7e+f )(l orgjgs an inductor is doubled, the inductive reactance oojgregga6af()7( +l df 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-gepms7 fboe;2 .v; og AC voltage across an inductor approaches zero, the inductive re p ;7.mvf-ogebeogs 2;actance 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 thiu*rsern g -m:3yd- ch)9p l cgy)pr8.xs circuit, the curren r3 ngmr9s x:pc.lre-dy*-) pychug8) t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactanc w5tavi+rkvn54+-, xcubne4 ve in an ac circuit changes by what factor when the frequency isn 5,+4bv ki-e 4cautxwvn 5+vr 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 volta / :uxbb/+w2eopph .exge across a capacitor approaches zero, the capacitive reactan eo.ub2:w/hpxe/xpb + ce 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 ofix /8g fshm);c the inductor and capacitor in a RLC series circuixcsfi h ;8/)gmt?

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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 9d6 plmjwr,9erusa*+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 of3,nalxyi n8udxsw)yw5u 8s8 - the circuit increases if R increases. 8w 83wi8,-sydl 5xa x)nuuysnWhen 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 cit4;*28. vwznzuv5vj db odi:urcuit 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 circs ,dug (hlc:9ouit 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 doub+ x9tp;lhg6+m:pfm6wm nd r /rx)* jhanv9.mble in an LRC series circuit, the reso;b: pmmjh+969 f/6r nxrmmaw*xt.) hpndvgl+nant frequency 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 applied vo( ywcwr2on, k;ltage. 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 wj jto5v xxrij5mz p,+z8 8u9/mhen

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform e/e or gj;12vumagnetic field of 0.20 T. Find the magnetic flux thru2/;vg e1jreo ough 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 in a uniform magnetic field o0j3ckx dx (w68en 1cjbf 0.20 T. Find the magnetic flux through the loop when the plane oj81x(bwe03c dkn6 xc jf 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 magnen9(txuy/ty oa:*sf xg*y. (j ytic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fiuynyfg( .(yy9*ox * sjat/t:xeld 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 adjust.zt 2*bdwfz2rvkr 77xable 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 changesy3ln l 5vt-m, xb3-mx1oynw5v 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 square frame with sides 18)i7y2.tw4bq 9okej do cm. A uni.twij2do)qyo be4k 7 9form magnetic field 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 15 turns andg)np /jo,;lfr ,3 1i aisyw0id an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and areppxvs5-e. atj0b;g. ws n8t: pa $0.20 \; m^{2}$ 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 605dqyvorv9 m8g d0 st n )zb7ks,r+4*.lx-cfdl m flies horizontally at a location where the downward coms0x lf,g kdrn+dtz r)q sd9 -vm.4cl *5o8vyb7ponent of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bzr lwz9u 9l)*tar that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s aboutuw9t*l zl9) zr 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 and a cz5,lvm *vdv um cfp+(3ross-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 consi2+ t9lnh vinxwx wi 39,*tc7qosts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangula2v o32 s8jf80w2hlw 0uqtqboxk n,;o wr loops on its armature. Each loop is 12 cm long and 8 cm wio28w8b q ;2,jkn0vhs uw0f2txqlw 3oode. 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 -verh-tssr g*pw3h9z-dw6 mt4 ue9m0 area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator. )ud- ykj/y7gnti 3ke with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area otdkk) y3/-u7 i.jgey nf 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 gener g,dwdyqut g()zop 184ator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor uqsbu05l q4o.;b (ndsoperates 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 hailhte; ;qih 83x(ii kk,(wlltx; +*rcve a resistance of 6.00 W. The motor operates on 120 V AC, al*i;wthi c,xthe3qx;+kilkl ;(8ir( nd 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 2aw c a6kk3:/6ky1 kv3v9symvx 4-V power supply. The operating current i63 kksyw m6yxvv31a k9 v:/akcs 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistanqetsxhpfld rnu*+2 o 8)hp+57ce 6.0 W is connected to a 24-V power supply. The operating current is q)r8p7tf s25nu*d op+ l+ehxh1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected t2 t ppm cjaet+v4ce)x ;)z)z0s8or; eko a 24-V power supply. The operating current is 1.0 A at full speed+app)ex;2 so4jrtcv;ez cke8t0m ) z). 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 needed to reduce a prmgz)epn .uo7wga72p 2 oa*j n6imary 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 +z,h4edaz7ul z5i2 +bfu. kkh to flow in the secondaru, z.k hid4bekhz+la u5+z7f2 y. 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 arez yk ioum+.tir r/,*/n necessary in a 110-V primary if the 24-V secondary has 100 tu.zt ,o*iyk/inr rm/ +urns?

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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 20g 6(rf) ojac*ho 14a zflx(.w *lsrx,h00-turn secondary coil. Iff *rasxjw4,of(a1 h() g *lxh6colr.z the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in/6 zkorvrq6383 h1zk+ zajqct the primary of a transformer. Assuming 100% efficiency, how many ah613t rk/3aj q6cv8 zqzrkzo+mps 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 provi7a f+-7n w9tw i 9kxzwkzp31skdes 7500 V at 10.0 mA. The primary coil operatewkf7zp97it k a+w9zs1nk3-w xs on 120 V. What does the 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 haj3:4rba,lg vxhcr2 oq h5*3cfs 60 turns on its primary coil and 300 turns on its secondary coil. cx j hr2aq*o5g,:rlhc4f3 v3b 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 its primary coil and 300 turns on its secsc1ehrd8*x ;tondary coil. If 120 V at 2.0 A is applied to the primary, what cur c;rx* td8e1shrent 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 seconda / sc2bhumy;ql)/x7o vry has 200 turns. If the mxqvu;s/ ohb )2/c7ylinput 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 transformer has b2 l8 hr -x a45pj-e9mxokexr-100 turns and its secondary has 200 turns. If the input voltage to the primary isx4l-k b r-52-pajxoex 8r ehm9 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 secondary has 200 turns. Id1/a y.xpcz o)f the power input to the primary is 100 W, we can expect the power output of the secondary to be )p yo1/ xzac.d(neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually s mmx(0-kd 46nc;0iedz p-pgry tepped 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 tp4ie cm-mnk y0d0z-dprg( x;6 he 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 currayfym+s l;zc f-pi2x.bu9 ;3f ent at 120 V. The voltage is usually stepped up to 4500 V by a tranlm2u zpba;fcfy.ix3s -y;9 +fsformer 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 current at 120 V. Thet 67ppgq 2qt*c voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find thp2q7qp gt6ct*e 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 resistanc,vd4 wqukcc(2lyu 1m(e 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 elywuc( (c1, dmkvu2q4 nergy 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 of 0.60 W. 4,kaneeg9*k z A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage aknzkg94 ,e*eis 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 mpftzwcwn ;s s5n 4tfn9gf7al,2: 2qk80k ehr0uch less power would be lost if the power wer ap:f0tcn849wls0gkhs trk f2 ez fq,n 5wn;72e 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 genera+x-ukv 2op kq;tor 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 be steppedpuk2+ xk o-vq; 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 npql (e1gj4qmh4aibxa41y70 current of 5.0 A. How much energy is stored in the coil's magnetic fiea4nl (hpjeaq4my q11 bg7x i40ld?

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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 6m(l .4em3se wufg-s4n .0-W resistor and an 18-H inductor. What is this circuit's time swm 3m(e4l4.-sfug en 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 volt)58 jz;alhx/m)c ; gdk jxhhp)age in an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak cf7 mwhy.*0t e2qrbxw+ urrent?

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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 in1 hy3h;qs03ofraf +ylto a 120-V AC outlet. What is the resistance of the lay03 hq 3+af;hfls1roymp?

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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 b v++e g a(6ep+ j7sgh5qmfqg,a 120-V ac power supply. What is the peak current through the resistora +m(ebgqeq fj+p6s hg7+g,5v?

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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. Wh1tal -miv7 9rti :fiw*at is the power dissipat *- 7itawv rii9:ftlm1ed 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 50-W resistor vxwxo+12emx /xh wy82 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 5c kyw fk(no*.;0-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resiyio. 7wdv 7e)lv22bd f *4zio5a6z 7*r objkbistor 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 indu:be6 x *9xojc1mw2fgpctor 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 inductivenc(j)-bh t rpufh yku*l4 w wce,99);l reactance 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 induc0ngag4n5x4bv+j;jt ntive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive ren9joz5 )fl sjg/ z378vqhzg)eactance 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 inductor when 120 V AC at a freque-m:dmlb4doe c w:;j w2ncy of 20 kHz is alwj w:dmm :cdbo;4-2e pplied 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, 60.0 Hz s gkif.0iz :dt+k0 7ae-egf.gkource?

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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 o8pj.e- 1ga vbvf 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.hyd ik ,61uv:+vqkd i 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 have a reactance of 1200 y8o0gv z-v-iiW?

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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 thedrfj 25 3 c;r3vd0tnqs gh-)dm capacitive reactance of a 0.010-mF capacitor be 100 W?qm; rdgr )2ch-vdf35 ts j3n0d

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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 thqz l0 dyf/vopoa9(q/ (v8s.qj rough a 0.0010-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 impedance of iqhan (st-c3mne+)ghp:7w k8an ac series circuit with 12.0 W resistance, 15.0 W inductivs3an -7 t(8h cen kghw:pi+qm)e 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 ifqnnfw qq,ex/;2jx: zv. mk4i/ a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connevem/w,2i. nf;q /qznxx4q: jkcted in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, anm;+f/5 wkmpf/4/rg7 sz gurgyd 1.0-mF capacitor arefgfr 5ms /yp7/+ ; gzwukg4/rm 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 connected in series with a 20-mH inductor, what is 2w l :xaf2z*xzb4vwyp.gl* 6o the impedance at 1x6 *:xpyalgw24v * ozfz2bl.w 000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is im3:ghb0( g vosq;d8wthe phase angle at 1008:g ;0v gohmsdbw(3qi0 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 c- aq nki/l-46o;pql *zh8ko sjapacitor for a total impedance of h/n -kqs* klopo8a 4;jq-6zil100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-6gub-45b jvzztoiq17as p3:ky mo,t1 ehel.* W resistor and 15-mH coil to get a total ibgoe-1 tiq ky7 mjs*vaz3:6.5 bp ,tu1zleh4ompedance 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 indc-xtg2aov 7yrv7 r3(suctor at 5000 Hz for a total impedance v2ryc(rst vgxo-77 a3of 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-Mfvqw7-9 . kuu wcy.ml1Hz for a total impedance of 150 kWq w-y9v fmck..1ulu7w ?

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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.p.-1z)vdbhe a What is the impedance at 1000 zpe)h1dav -b.Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a1yqpua wuk-- ,ok+ v3e total impedance o1p,yu woek +-av-quk3 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 neede /iwx9ta4 h9 do;v8yjdd in series with a 10-mF capacitor at 1.0 kHz for a phasixvay9d/d4 9t8h oj ;we angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for2vz,mso)q1i/ z fst)d2ri: aa a totaliz /1mt: )rqzao2s2fsv)id a , impedance 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 thzpk/;tqvceu/ m5 ia/m) a,9g6j:eix te phase ,mekaj ;q:9ti6 / zm/5ca/v giex)pt uangle?

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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 9n 2ypgmz x9+c1.0-mF capacitor are connected in series?cy+zn 9px29 gm

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, and a ww)+ .a gdhz8 e**jypi3w/ vfm0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. Whajw*.f z)mev3*wd8gpiy+h wa/ t 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 capaceyduf,1b. p) ahv e07ditor of capacitive reactance 30 W, and an inductor of inductive rea7. hab p 0eevfu,1yd)dctance 30 W are connected 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 pzis/ 6cpbn//circuit containing a 50-W resistor, a 1nbsp 6c/p //zi0-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in ts4 9n*kgt4bd-uj qp4series with a 500-W resistor for a phase angle ogd b4n9j tk-* 44sputqf $40^{\circ}$ 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 ,6 ,.nkfgtp*cj wlri )what frequency should the circuit be driven in order to have),t.kr,iw6p lcgn*j f 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, 15.0 W -h6cj bfv(5gy9 idlva i ;jn2 5 8uvpy-c5fc4binductive reactance, and 10.0 W capacitive reactlv2-5 bycjhvu8aycn9 g p6 ij4iv(;c5ffd5-b ance, 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 anv c(k+ann7-s9+om 5g :iuzkf q 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 (qz vnwa vn8-e 6 sp8r3o/f4ehf-lgw3 has an impedance of 60 W and a resistance of 30 W. What is the power facto n/fn(zhe8f-sqo3w4p6a v l- gver38wr?

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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 retr 4b1cqe92uae)ax *b sistor, a 10-mF capacitor, and*bertxe94u 1bqaa)2 c 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 -vl,c*l,uf b hand a 15-mH coil in series?,cu- bhf lvl*,

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capan/tz.wk4p76*imu u; *s-bppd(f c padcitor for a resonant frequencyp7;p/*au64 z- n id fk mbpp*(c.wustd 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 3.7-mH inductor for tj3hn;1p:w 9 0thcc rra resonant frequency of p 3h1;hc0nc:rr tw9tj1000 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 resistor and a 40-mH co 0 +yneagmc8 au6izx,8il if the resonant frequency of thaa+cxuy68,men z0g8 ie circuit is to be 1000 Hz?

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