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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 vd5*eg9h+;+k fckx t( tlr9 .zl,sxfrunits 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 induc67 ij(7:hp.f*fgbxli/rh r,ft:cjecw7y (x i tion 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*ph5 q+bzpwx , a coil produces what kind of change on the inducb*w,z x5p+qp hed $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire produces what86suvxi8 c i1y;c7tab kind of change on the ina 8scbuv x; t8ii176ycduced $emf$, 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 what kind of c1owa 26u-;mlr)wr 8k ytuxf/ ihange on the induryw81k ;ltmfoux -2 /uir) wa6ced $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic fie qh;rc1th-c2us)wd e/mc: o: kld 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 pc c) oh,+d die)qh4 y3,mv:0wwcu-e mgoa4i8in a conductor will be that which tends to produce which o-oe4d)mhow+0,c dcv) ac, iewq4 mu 8 h3pgi:yf 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 horizont,qdw906 )u -cz: cmuywha*s klal table. A bar magnet is held above its center with its north pole pointing dom)hu,qdwusc kc9 *z:yl6-a 0wwn. 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 h+b3t bq lm-+s+qhi d:a4a4zd its center with its north pole pointing down, and released. As it approadtmlda4 zs+ 3b+hh+-qq:4biaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vectort2er if,c,h .a points straight up. The magnetic field vanishes ,,2ah cr fit.esuddenly. 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 wh,zm3 yb2nf a) x 3qo7ok:xex,qere the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the 3xkfxmonzq,aqb3 2)x,: y7 oedirection 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 to twu5n:8,,adn1etcxqp in a region where the magnetic field points straight do wxet1,8cq 5:d, ntnauwn. 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 horizontal 1mw4ub, a0fup/ (fsyxiaup 4o *ie m.4table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. (f1 /ue *4sp 4w,u. 40ab yauiipmfmxo 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 entering firsv*eutg x5 st 9h ,ntmri4v,.*ht. As the north pole enters the wire, the induced crsihv*tux,4,mt 5.h vng*9teurrent 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 spee cz//+ qq1pqlsd about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orienls 1c/+ z/qpqqtation 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 consm 1); cvbdm(wz8a )bm zcks8(bqci 8m7tant angular speed about an axis whose direction can be varie vd s7)b;mw8mai8mz1zcc b(k bm(8cq)d. In a 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.: +r,: rqfisl ,g:noup
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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 tg g4zkdvv510 yyj0*ur 3yk *ithat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field.urc u 7qwfv6,,l m/ia5 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 moved northyo745 spp+.7 tiq8ap/;cx smw9 g8 n)eq tlvvhward at constant velocity through a magnetic field that points straight down. Make a st/vgc5h.ss xn pwt)7pp4i7oql8m 9eqa8; y+ tv atement 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 anpvw*6 sv1c+)+eokkev gular 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 transform;1o y oxthk-gm9s,s6xs

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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. The frequey11h;ymn qm 1cncy of tm1q yhmc y;n11he $emf$ 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 devtrg.4 5(wbpq tice used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device t7smho6j+2*l rhpy x 5yt qf qi t*,l8)-qxew8dhat

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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 conta,i88pkl,cp /pzf;hp zins more loops than the primary coil then it i,zpkf8hl;cpp/ i,zp 8 s 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 th2hpo:kmzja e(( z rr*6an the secondary coil then it is j6or*:zmza2 (phre k( 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 input6xaoh1c/czr -

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant ci p2++h*assu3oxw9dlauaf: jmp.vc : 2rcuit,

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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 inducthj/j62oxfl z x6c12ix or are connected in series to an ideal battery of constant terminio xf 6x/xjzj1 26hcl2al voltage. 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 to an idzt)inov;,(ht* tox *real battery of constant terminal voltage. At the moment contact is made with the battery, the vox(oot r*t)i *hzv tn,;ltage 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 afeqsn tgg :)c8cb-1bn.j t.)hnd 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 resistance R is connected to augk (p3 e-t.zu 1dskn)n $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. Tm2kn/pt63 jffhe time constant for the circuit represents the time rep n 3k62mtffj/quired 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 indut-9n odw97w pvctor are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents thwo 7n9vt pdw9-e 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 ha, t4hy56 bluktp.yy:nve the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply jo3w)0xm 3af)p ccma,. 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 connected1tj o x6zp,: px0d:eo lam18utyh n,j: to an AC power supply. In this circuit, the current 8 a0xnulz:yd,1: mopt6hpe: 1oj txj,

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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 gfdrh j8 i;2bmige0(/the frequency is triple m/rhbi8g jf;i0g(ed 2d?

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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 *6jnn-/vaihyr o 1x f0,-sji p5rp :vkvoltage across an inductor is doubled, the inductive reactance of thas-*xy6pr,/ 0 nv firjkon1apji-:h v5 t 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 vol0-l *8ru)yrxqk0mv w4p8vddxtage across an inductor approaches zero, the inductive reactance of thatpv dvxxrum k )d8q- 08w*0lry4 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 supplyb+f5lir* q/0cwv ec( ze q+cl+. In this circuit, the currenbel* c5+l +qve/cf0wq + (zicrt

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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 ci(y cre4n0t7e nrcuit changes by what factor when the frequencner t40( 7ecyny is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacit+ t id5srjc33b)*6yxue5z nmxrr(z*s or approaches zero, the capacitive reactance nb3*yr5er( rics *) j3dm6zsz+x5 xut of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inm u8sd)xnpvz,:aj7acg+o /v0 ductor and capacitor in a RLC series cxzup gn m/:c7d), asjv8+a0o vircuit?

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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 iszf 5ronmc vg. wnx/t7evf)w 4+,o8e*y 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 incr u6f dwbis-ih;.b e5 t(9qtwi(eases if R increases. Whefi9t( w5i bdhs(;t6 qe uwi.b-n 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/bil*d8q n +pguit 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. Td7.,8 bdynbg ohe impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance botco)x6bl7 gqxoanu * :+h double in an LRC series circuit, the resonant frequency of that circuit 7olax*oq unb+g6x:) c 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 voltage. At resonanccqc ;bv 4:48svsb/w lie,

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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 wheqbt/8b*c8 3d(2lbjrge r vr1 0 n+duudn

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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 mmt: ;(wp/yil+ vkg12 s n:mbza 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 :b+1(/my mvn t;lgk:ip2swzm 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 fieldp i3 *s)rjs;v5s/pcoqm0z 9mt of 0.20 T. pq30m5msp;/ vcosrizs9 *tj) Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating iepsaf ,;1jgr *n a uniform magnetic field of 0.20 T. Find the magnetic flux throsa;,ejr f*g1p ugh the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjus;dzbc3ef 94*mwss+p0ly.wu +p o1sos8 9kwomtable 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 coilcn +dkb7 w1(vb changes 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 wts *0ol)a8n4.p d xftbire on a square frame with sides 18 cm. A uniform magne abn).s8f4txp 0t*dol tic 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 and an kj93v vo1 9bi+jo-1+swu ixr h4b;cp -mkq,huarea 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 argy*dn z08dr s7gp y/l.wp3:ykea $0.20 \; m^{2}$ 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 fl+cob-genk + s j9n*,vyies horizontally at a location where the downward component of the Earth's magneticsgj++9o b v c,*n-eynk 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 isifrmj;aaz ;m6ae h3-y 8;c 6cprc0ed+ 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis throu;r ee;z6cpmi-jcf ;a3r06cy a+ ma 8dhgh 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-sectionadn 0b/ kx6* 92zfjf+gihfs20xi gf 3zal 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 consist02 6c,tcga sje9aa7pjd.kb4 js of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armaturrud t7idvsl;0)fdt .8e. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of ;id 8.us t)v0rtdld7f 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 wi-zpbrd0 :cqw ss06* hmre 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 geneh tbwt;t1 5 :ynh4 *hyorntv;x/;)o ilrx*.ovrator with an output of 12 V maximum when rotated at 60 Hz. A magnetic f b/o*xot).town rhi lt;thv:x1yhvy5n r;4* ;ield 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 wit- 6;litshyp rgtp1b5meb0m 53h 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 oper6wu+66e zit8onauy/g0lz .s nates 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 havv,2mvs 3e zgpk,ud 5a/e a resistance of 6.00 W. The motor operates on 12pu avgme3 /2d, zsk5,v0 V AC, 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 tx 2fn 07s-nztj1in3e wo a 24-V power supply. The operating current is 1.0 A. Whnx7jnf3w nstze0 2 i1-at is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.clq05d. da b8nr.kz:y 0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is tykrd.c0db8nzl.: 5q ahe 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 resfq tkauyi0 9e4ovig3 y)x +x3/istance 6.0 W is connected to a 24-V power supply. The o+o340gaiifxx uq )tek /y9y3v perating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce 0 fn4*kjd4 xmapn 66eya primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the sta7tqji3 gu47 econdary. How manytqgi ta73j7u4 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 necessa 5nu aviciapgbr;2zf*curg+c 6+/ u;6ry in a 110-V primary if the 24-V secondazc*6 p+6r; cb;g+ vgnu2u aiifa/urc5ry 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 500-turnknrluy p8,uu8h 6rrl- 1a)ii, primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is th), uu8,nr- kir6 8a1 phluilyre 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. Assuming 100% efficienw5,rxe c0bko(b9eg/-e.aj a n9my6 mzcy, how many amps at 24 V can flow ie0 xe9r e,c-n a(j9mwbo5mya6kg.b z /n 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. The oc/7lnblb/mg:snrab/w+ 3i , primary coil operates on 120 +n/cb wl7:bi r,b l n3/gsmao/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 has 60 turn*t8/3g sfjug ns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied 3g8fsu *jgt/n 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 pric1q9qwm 2ss it0 8;trimary coil and 300 turns on its secondary coil. If 120 V at r8q0t1q t2ci9s ;imsw2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its seconyvc(11p sz c.:t r9rdu4;(6qgbi dwuidary has 200 turns. If the input current at the primary is 100 A, we can expect the output c9u.rb6u; zic:41p dyqi1(w(cd svrg t urrent 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 transk())x 9kdmvc wformer has 100 turns and its secondary has 200 turns. If the input voltage to the primary i )vckm9dx( w)ks 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. j stz11:p3j n+hmh/akor8 7yjIf the power input to the primaahs11mr7: j n/h+3ok jpjzyt 8ry is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A olqc id1q a;s28f current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power l8sa21lcdq q i;ine of total resistance 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 120 V. 06fige/coim 6vm qk0ec(;jo 8The voltage is usually stepped up to 4500 V by a transc(mfivj80m 06oo 6eiqe/; ckgformer 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. The voltage isk4 znl9,xj .wjbkxv/2 usually stepped up to 4500 V by a transformer and transmitted through a power line of total resist/xx j2 kbj4.kwln, z9vance 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 ab 8 s25;waocz628cbtwd ,sntg 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 d26ngw 8sw,a c5s8bo2zt t; bc100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A generz 8ngwu fsn5v0fv4++ vr zu2p8ator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is 5pgzffvsnvz+8 n2vuuw 0r 48+ 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 lild9o-n-idx( t(yhu9f ne at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instea-f n(-dd xy9 hlto(u9id 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 v rt(.o+mwx4kon a line with resistance of 0.60 W. To what voltage must the genero(rkw 4v +x.tmator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is y 4fh)g6nirl2b yxn .qm*4r. nstored in the coil's magne 6l) q4*.by .ixfr4hnryg2n mntic 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 cos+w uc/i6ao /untains a 6.0-W resistor and an 18-H inductor. What is this circuit's time consta/s+o/ wiuca6u nt?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where thev b,t gqtu0p;t n/w9ez; t7e1e 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-)e ipby4y1::rte :fofV AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. Wo8 g/udqr7c6gw k v2a5hat is the resistance of the lam/qw rcau267 g o5vkd8gp?

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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 12r:3to/, /nwtf lz2vlkblxs . 20-V ac power supply. What is the peak current thrto.l/ sn/v bf3 :l, ltrkx2zw2ough 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 12blf.0kbbl n xb+fjl7w4/ua5 l1/b-t z0-V ac power supply. What is the power dissipa z5lb al7ut wb+01x.fjll-b4//f nbk bted 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 res o6 itkc-oq3fivt-5-bistor 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 ykxt 3gqw0-nhvu4*/aresistor 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 resistor u6z3)/xj.xsz jzt i m3is $I = 0.80 \sin (240 t)$. 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 Hih :7 2im2x+knh2pbz zz?

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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 coil a/ 9qfp(ml c1ldt 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 reactancygb4oqx3t8 3c e?

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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 ut wjvf46gh2 vwj9kbhwk7*-i(.b h0e 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 inductor when 120 V AC at a frequency orpdskbynb1tw b-np65.5(m +v f 20 kHz is applied to it56w .1n t5 sbkn( bv+pd-bpymr?

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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 soua3 *2px -bqoua(z6v6vs whks;e:m 8barce?

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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 fnvd mw*d*11 vkHz?

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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 re h9o(sy+;lks i y 0nfj6uzr(q:actance 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 reachl70(, +i4w2y6 ksqnbp ovsxx tance 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 wilh kb4;;9c(eg)xx o zjg);rp xtaa.vf. l the capacitive reactance of a 0.010-mF capacitor be 100 W? )rg jxv(g 4 xbh9p;x)zoce.a;;ft.k a

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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 and 5. ti89qette;dhz-* 8 fk0 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 vkr3t vue o :ig;57a/iac series circuit with 12.0 W resistance, 15.0 W inductive reao5t/u:3er;7gv i v kaictance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, and lvu5 lon3wy)nb 6 5o;09wir sg1.0-mF capacitor argo5orul3l6n5n iw; 9)vb0wys e 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 resis4ua0:u) ypi ohtor, 20-mH coil, and 1.0-mF capacitor are connected in seriya pu)h :4ou0ies?

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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 thkhrstqc-1a,4-smv44 inh ezvv3x 25fe impedance at 1000 4xft4i vnm1kshs,--reh2zv5av c43q 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 connsc:tv(c r t;5 4:szekm..ljs hected in series with a 20-mH inductor, what is the phasecse ;.hr54 lzt .mj (cvt::sks angle at 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;ig5sw3j rvb nkm6/n 9 series circuit with a 20-mH coil and 1.0-mF capacitor for ai5jrkg9 3nns/ wvbm;6 total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitancesfs9 w.5kdvz:0ifr i k3 is needed in series with a 100-W resistor and 15-mH coil to get a 5fdf:i 0k wk3sr9i.vz 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 )jip 1*k4ej n(ruvy2jgc h))ywith a 450-mH inductor at 5000 Hz for a total impedance of g)r ikyvjyn2pc*eju())14jh 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 4l jt1ntlxdy8 oc6y-8 a 100-kW resistor at 1.0-MHz for a total impedance of 150 ktntc- l6y 8 d8x1o4jylW?

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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 with0s*-t -rqppwssr)q5k o cl.s+ a 20-mF capacitor. What is the impedance +sq5-p o* )krq ls-sstr.wc p0at 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 ser/cl365:.opejeu aw f3.phs nnies with a 10-mF capacitor at 1.0 kHz for a total imped 6:o33hwc5. eus/ en.fanpjlpance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor cqetgt;s0;p + at 1.0 kHz for a phas+pqsg ;t t0c;ee 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 qzjbpak*4 a 2,gprj+(with a 30-W resistor at 1.0 kHz for a total impedanpj zg+pb 2 4,qaakr*j(ce 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 12( ek,.8lom. zm7to)xm ;lvr 7ak pdzx)0 Hz. What is the phase anl.)okt;a)m7 v7,(k z8e. ormx lzmpd xgle?

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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 er+ w gx3vt/bqus*0 v,V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected *u,evx/0sv 3rgbt+wqin 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 cow6oj4,7x g3,hj1jgcv ob1amh8 is u-be +sq+ hnsists of a 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 current in the circuitahqb 3,hum +csij71jh46soo+g x,j8 -b ev1w g?

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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, hw l zj,4s;afqcpc3wu8( d(c. a capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in seriu .wjl(( 4 hdc;,3qwcaspc8f zes to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit con qqz nuws4g9-)z6vm7xtaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor,nw6vxz9sqmqg47 - )z u 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 series with a 500-age 3xuh3i)04e; 4h0cq l vjcfW resistor for a phase angle of 03);u4q ei0cv3 4fhacxl gejh $40^{\circ}$ 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 what fre io k/j(tkb (+3rr9sfmquency should the circuit be driven in order to have maximum power transferred froom bf+9 s /ikkjr3(rt(m 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 resist/gw 95vybwn 51pn5kcv om4f0kance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V powenfvb45 9gnwkov pm/5w y0kc51r supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC c po n)27walg:iircuit 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 io+-gqog -a:sl mpedance of 60 W and a resistance of 30 W. What is thlas -: o+ggqo-e power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 5x*z/( o+pim5u/bkt0bj433b hleovao p7v tm 70-W resistor, a 10-mF capacitor, and a 0.45-H inductor/t p7obko50*jxme+7 i um( a zbptvbolv/433h, 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-m lww9x z)+ej(p tgpm1)F capacitor and a 15-mH coil in series?+ )jwg9zewlt )m1p (px

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resona-kns,owii3tj4) d, /xn9ckw-6igd f pnt frequen,3i/cop,w-) 4n-g w kk iddsjtnxi9 f6cy 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 s mh,b-n-e furs7hy(e/ eries with a 3.7-mH inductor for a resonant frequency of 1-n mu r,f/- sbyeeh7(h000 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 seriesm8z7t svcz5zs2h/ g2wvtn qw23 -uts+ with a 30-W resistor and a 40-mH coil if tvtnhs z7+q ts28cs- /wtgz3v zu wm522he resonant frequency of the circuit is to be 1000 Hz?

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