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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://autodiscover.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://autodiscover.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 w4i(c gv /d7)*3wvpk5 p;lp-xaeaaenmagnetic 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 states n2eleqe sa,3c 5z), pdthat 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 pro88 d;ls -nk26z ixitue4ss0k mduces what kind of change on the inmx ss20 - 8inut id4lkzse8;k6duced $emf$, 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 +i dznm8b)x;a produces what kind of change on the indxa ; +mdznb8i)uced $emf$, 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 wha5kdy.b 5ww*mcib//bp3pmdi6i; q :ajt kind of change on the inducedcid:bmq d i ky 365 .wb/p;5bpmw*iaj/ $emf$, 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 r3r 3iopfj gfv9(ga 1k(e.z1ra magnetic 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 i j3h+zh+*j mwu(g ui6ju b3lg/n a conductor will be that which tends to produce which6hu g+g 3jzw /j(hmj+ ui*bul3 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 ongz 02ji 2v+ l7xlugq6y a horizontal table. A bar magnet is held above its center with its north pole pointing down. Thux 7lv2zq0g ijg+ly 62e 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 h98yj 1 9shyzu)y3wmeaj u6t.held above its center with its north pole pointing down, and released. As it approaches the coil, the falliyy)jueyuz9 3h 9s 1m.ajtw86 hng 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 vector poipr3k,daj2-yt n rlri4 y6i( -onts straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the i-rdky o62p ilt3,i4(jay-rr nnduced 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 re6 0 :4m xyluq ts5(i.aerpjqq(gion where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from asq(mjql 0 u: pqa(t4yr.56xe ibove, 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 regiondoowg-+:h5c 0a 4wn vl where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disac:no+lg d-0oww v5h4 appears?

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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 wvjr;)szc;es+ x:c,aev lf..a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the : azjvl ;.crwcex+v)f,ss.e ; 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 tb7n/ s4z (zcvvhe north pole entering first. As the north polvb/(cszzn 7 v4e 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 axis y lcfg2yk *huixlfmg( ::857*g v+viowhose direction can be varied. In a region where a uniform magnetic field points straight down, whm uyclhk:*g7y +58(*:g2f ix ivlofg vat must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed abedxvg kk2vd js76,/5 jout an axis whose direction can be varied. In a region where a uniform magk756 ,xe jvd/jvg2sdknetic 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.deuj . 1flq:p,
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that an*lr nec922t cqo9l 9lv $emf$ 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 *gb lp1es3 q)gbio .(xcplo0: 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 moved northwarfq oa9jwu,t42d at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across a9 42 tj,wofuqthe 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 vewg 2s w2b+.xwwse(b /klocity $\omega$ 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 transform1t0pnb7 j .o ++syyyvws

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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 throug9g,xthvm ;x7m 0y usxy;h:1ikh 60 revolutions each second. The frequency of tg0mx7x1hyky;xt u;his9 m: v,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 us :;yxzhv6qs v;8tx hcy7*ly7led 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 tha .kbuv2 jp4*i0m:nb ixt

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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 mojc1m;msh 6 7(dpm sh od0j,su(a4)nwe zfk7q6re loops than the primary coil then it is u)h1jmk 7 ; sdq6 poma,df(w0js4c mehzs(n76a

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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 7;z(ir v6ndd /o+t0v(( .cdjmicicvj more loops than the secondary coil thej.dtic( drvz j v c(c/;(vd7 noi60+imn it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the powe xc ,n.4x g2ad1q+dh wd.z+gzvr 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 circuite:id)*t gm( cz,

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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 bayeh6 *70id7 u7kfwyh attery of constant terminal voltage. At the moment contact is made with theiw06h*ek7huya 7yd7 f 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 induct hl /nwvzv63nprt pe9 ,4gu1f;kv,-m aor are connected in series to an ideal battery of constant terminal voltage. At the moment kvf1g9urnn /lp,w, zp6 4e-hmv3 tv; acontact 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 inductance L and resistal6) qdtjh qp3q62kw4ance 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 inductnzeizm ,( sp lkg 0vepb8;,8x-ance 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 inducto b 6kulzw-3-r9i xgjh:r are connected in series to a battery. The time constant for the circuit represents the time required for the current to:ug- -b6wjrz ih9xl3k 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 connectmt8vj 9i9h:j3+ pl*5al dg hzy*j(zwqed in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for*3aj+jw 9zvl: qjh(d *hgp5tl9z8 imy 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 h s0)d0:lg,qw emvbh .ebdfq1l3ph /h eu2o6p0ave 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 to37:yq.ka in7 wr( ovpabw6xk) an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC ph j/ 54y(cbiujh:;p mz(fud)eower supply. In this circuit, the currentu(zymp5: j/;)ce dibu4fh( hj

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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 an0y-q)k1dlb8(na0m azz2il p m ac circuit changes by what factor when the frequency is tripdzn-0m0 ia(2lk albqzpy1)m8 led?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, m,16zld dsu;mugtu 3d )a b5(,p,2nwqn iw* dpthe inductive re5 u,ts n(w12;u)bz ,*lwdu p3mni dmdg6qap,dactance 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 acrosz0(14u,8lwvvhnkh7 iv5 gxhg s an inductor approaches zero, the inductive rea4,(hxg7 1nv5ghlv 8vu0whik zctance 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 4f 2u9ji2(x.ju q, 3ioeblq ryan AC power supply. In this circuit, the curreiij2f3 jl(q,rq yuxboue42.9nt

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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 changesh)opg o wc))s/ afh9k5 by what factor when the frequency is tripled? scao)kohp 5) /9hg)fw

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approachesh0dy gvtnk /6dw:9fud24:(;k iwatak zero, the capacitive reactakav( dk94tw6 :gwdy2 f adi0 hknt;:u/nce 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 t0)5tp+j3n m yy;m8c7;alrxyrgp2enw 4 f 8jyrhe inductor and capacitor in a R 3ea4yx8n; y+c5 m ;p2grrwljf 7)rnp0y8tjmyLC series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLfq /exs ypjh+ iun k /*96c8;.nn9ucspC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R increase d j2i+xb, vr8auql 4/vd:wta)jhhb0*s. When is th:0tu jw* idavbr2vdqh8bj/+l ,ax) 4his 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 impedcwv09 rxh,0+ezb+ h.b qymz*tance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance 2b,1;yhiit2 x2jcvn qof 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 capacit9l ig9ccyra5) zxwngm 8:7wp.ance both double in an LRC series circuit, the resonant fr.y99w lnx)c:ac pz8rgm7 w5giequency 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 appliepf/+kt) fr,s rd 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 RLCv8vh:q,ws (ih circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotatink5r iciatcq+lwf k6 t9/+q,x*g in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop wherx, a/ +ckqkiw 69lt+ciqt* f5n 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 magnetid k;e e1mb. nc*2ar4l3 s6ngqtc field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vecq4n 6b13c at*eelskgr2 ;d n.mtor are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0rjw40lv//u c7x.ry 5ln zv t1 11ypdbk.20 Try4t pw/u 1v110c yl7bd.rn 5jk /lzvx. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced f:3msb eb fllfbgc5)z; ,g .4barom $1.0 \; m^{2}$ 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 chi .2j25de2h )onps otre8rmfnc)h/u(ywe(n+ anges 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 withl0t)p 5dv )pdyo:;qbf5 tpeg ( sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changesqvtbog d)f5p el0p;yd :p5()t 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 wiqah30:f+cdpp zur; k2z nqf *77jd/aeth 15 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 and q (p8nu-6 dwovw 7k,crarea $0.20 \; m^{2}$ 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 wheqiu) s,e;pdjwn xb3se14cx/3re the )x,/3e ip3bns juqsxdw4 e;c1downward component 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 bar that is 2.0 m long rotates at a3,mturv,m1ju7 n4gux, yc z m; constant angular velocity of 2.0 rad/s about a vertical axis through one of its,zrn, u7 xm ucvmg1 4j;u,y3tm 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-sectional area ofywbyz **( a+njx p9fs: $0.25 \; m^{2}$. 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 ofnyu+ aqb2w5rz+ k: ;pr 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 armature. Each loop 3uoc.todw tra:i0la e.49r2pis 12 cm long and 8 crpr:4 owu a .390l tie.d2otcam wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wifqt(8f: ( vshsre 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 generator with an out9+*zk5 df(d9bp ; lc+tuqab rkput of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coifbbuk(d*cak;+9 r5 +dt9pz q ll is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maximum k6zb0ab2. m:+udzjzg$emf$ 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 operates 9-4c r npdtzl1(miz hm g;0.zfon $120 \; V$ 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 resistanv 5c+/s iyk9ey g6c4jyce of 6.00 W. The motor operates on 120 V AC, and when runni4jy6esyik5/9y +vc cg ng 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 resistanceu jvkom ytdq1(92rl;qz q(,c 9 6.0 W is connected to a 24-V power supply. The operating current is 1l2;(1(9kqy, 9cuzrmoj qqvdt.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 resist1,bjjl)c 7-be tvdp9vance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full sp)1jtd b-,cv e9l jpv7beed. 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 d*yw .y j 2,mj(av+hhupower supply. The operating current is 1.0 A at full speed.hyj,hmvd2u .w *y(a +j 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 ikb1b s15l* 7opurza-hm6 .xvwn ( nt(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 tolvlcn1t8:/ls q-y: t glp)n,z flow in the secondary. How many turns are in the s t):qsctl8ng1yvl: - z,p/llnecondary?

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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 tu8vkrm6j 5y0-r v/zcpc+f j z9o co-ov/rns are necessary in a 110-V primary if the 24-V sec+9c r//8oo0vfvjjcrzv -y5 mpz6o- kcondary 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-turn primar2hs,wy50 lw buy coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, wha5wluywhbs 2,0t 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 primar4 dudt(f78 bk+7argkdy of a transformer. Assuming 100% efficiency, how many am8r+kt 7d7bk 4dfdag(u ps 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 oj64, bjbxbqj t n9;dj2f a neon sign transformer provides 7500 V at 10.0 mA. The primajn94bdjb, j;2bt x j6qry coil operates 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 has 60 tuy6t bb yi5c-k-rns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltaget-65 - cyikbby 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 q/ m 79a-k7io;swfw nxturns on its primary coil and 300 turns on its secondary coil. I 7-woa9 ismqxnk/w;f7f 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. If08k0zw1f sxko+z mb t7is,ky 7 the om ,sk8+kyb1 wz0x0i7t kz7sf 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 transformer has 1yh p*o +)yx no5+(x-vxtao2bm00 turns and its secondary has 200 turns. If the input voltage to them)+xb o xovhn-y5o +a*(2xypt primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer f;fs6*knc v8zhas 100 turns and its secondary has 200 turns. If the power input to the primsz68fvnk*; c fary 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 of current at 120 V. The voltage/wg)5luv u5pvcu0 uo* is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the p55l/og )puc uvv 0*uwurimary 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 a30be,2bmy fro/5ubpm l0wz m3t 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power uez 00 m3,/ymr3f5bmb2bo lwplost 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 cuqtwrkn+j /56egf)0 i+g6r wtrxhv;/x rrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and ti56xet q /g /6r fv+0wgkwjn r)xh;rt+ransmitted 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 pqx1;b t8w1;ob sy/d3l+lueb a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heaxbe ow+bql ;t13yl ; s1pbdu/8ting of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A3jkv *npo,r7t generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the vo7*jnokt3p,v r ltage 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 woul rl-pf sr+k5u;d be lost if the power were transmitte l+rfr;pkus5- d 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 +(ofb:(;e; zqbg bbqg+pfk1 s to be transmitted on a line with resistance of 0.60 W. To wh;g;qso+k +( p(q ffbb1 :egzbbat voltage must the generator 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 h tmgkjkm kp66 .w7id2jibh e;m u5,qv -6d53aA. How much energy is stored in the coil'k-jh6ebma 5u6.t v5h26w ,impd 3kqid k;jg7ms magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-Wftgty2tv a6u; g 50q*v resistor and an 18-H inductor. What is this2 qtg tytv;g6fua* v50 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 AC circuit where the rms voltage is wr 9vw9 wd88p0h rd7rb120 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 in euj5hw;vxjk1wh2ymf1 ru xo1gl843 9 to a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-0bcm s/dom4 u7v)sc7yV AC outlet. What is the resistance of the lampy/077vsdb c u)scm o4m?

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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 power sup wcn5.n)wdvbfg,,zp ycbi 9 v2b4l2t2ply. What is the peak current through the resistor?lnbdbivz 2nyptbfw ),,2c2v5cg w4.9

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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 qfktktu1f;:p -yp 4:bsupply. What is the power dissipated in the resistor?q4kt:kt ; b fufy-p1:p

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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 resist7dec f/ ughge80:zp;x-. u bzeor 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 rof j(lfe8:g (i 36bxyresistor 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 resiu+wnv0 lpakt ct3k10+stor 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 inductoisq1l1z:w k- fr 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 reacteb4 b1noi j6p/3+ln sk1v) wriance 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 inductivsxyf m0*ayq (;e 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 qrz(y8s ;v5f rt5 l8x8 l+pm6tefum p-awb+q4 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC 0x1cuj2p. qf iat a frequency of 20 kHz is app0uj 1qf2xic p.lied 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 ah j99z rxa*tn7 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 rcdl)d;9 p 1hiteactance 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 capacitivw0 1i/b kzyg9 j5ne4jme 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 reacvz4ogtarkxhl o9 j9. rm6w3o q7.*uc0 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 will the capacitive reactance of a 0.010-m6hwer xwh:( (aF capacitor be 100 W(xwh(6a:h wr e?

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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 5.0 Vu ukiq*rx:*ar n(8b74gmx m8wdv0 q9n ?

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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 ofiemboi tj2e(0l 9yw4 9 an ac series circuit with 12.0 W resistance, 15.0 W indu9 yl0ebt2o we( im49jictive 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 iayuc:7 .glx ocg3( qea*m:k3xf a 100-W resistor, 20-mH coil, and 1.0-mF cap:gq lyx(:g.ae33cu*aocx7k m acitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH cx lpu( kt;.ll2oil, and 1.0-mF capacitor a ul(x2; l.tplkre 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 i/ xia e*kn chx,8mqxm /n,+i(1d utz8as connected in series with a 20-mH inductor, what is the imped ,(8u xz mxnq 8/xad*h+e,i/tk1i mancance 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 n ql/ b/5d+yaj1lrgy9 is connected in series with a 20-mH inductor, what is the phase angle a 5dlab/lq91rj+y/gy nt 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 ser jup89m u,(nut n3ct b8v:eflbf 6+upiy66( dwies circuit with a 20-mH coil and 1.0-mF capacitor fnbp ju u63idl98pue8( cfn yf t,vub(t:+66wmor a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capac pl6svz ;x)43*ltww ooitances is needed in series with a 100-W resistor and 15-mH coil to get a total iml w;s 6)ozpt* 3owlvx4pedance 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 inductor at 5000 Hz for a to yj4jhu9 yheh8f;- jz9tal impedazyu4 j8h9hh;fj -e9j ynce of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor *azk4 . trs7duat 1.0-MHz for a total impedance of 150 kW?sa *zkrut4d.7

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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 serrpidy (vq*4l -ies with a 20-mF capacitor. What is the impedance at 1004 y-ql*p(d rvi0 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-m2/x4ak6 xk7l gl3 yjtpF capacitor at 1.0 kHz for a total /p tgk2k6xl7xy4a jl3impedance 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 at 1.0 kHz)yb--my j,dmg for a phase angle oyy ,j)mdb--mg f $40^{\circ}$?

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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 w4 wwc-5dm:waq) br85gt ;vrs aith a 30-W resistor at 1.0 kHz for a total impedance of 45 mwbrw54 rwga5 vd-;:sq )8actW?

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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 12xh1z43spo8 zh1m*clj3 9h ic.p.g:p on+zgee 0 Hz. What is the phasegzm 98pxcph *egsjn3z3h.1.ez + ho14c:oilp angle?

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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,rt rp1+jbf +: x0:z/x;uwpv /sax(x:hmnsgl V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF cap j sst1g /m :rx0w;xn:x z/vlrhpxa +,+f(:ubpacitor 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 consistsa w ok3)qo1itsvev-: ) of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. T-) wastiq)vv3:o1 koehe circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive rei wa+ 8j8e t*g.rp0qieactance 30 W, and an inductor of inductive reactance 30 W ari0.+ j8p8rawegqt*e ie 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 circuit conta8x o8-zkipgh :m;.ch gining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, h gho;g.p c8k8x mi:z-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 50klt7t *przg 220-W resistor for a phase angle of lttp*k 7g2r 2z$40^{\circ}$ 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 = 200-2y hs6qng(e r8mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from thqeh8r(g sn2y6 e 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, 15yd(1 sx6 ; huol0zmm0g.0 W inductive reac oxz 0yg0 m(msl6h1ud;tance, 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 A: -7 cnfup0jueC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. Whait szi bpsc.6691 5ggrt is the powerg5iig p16z.6ssrc9tb 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 seriesrtom 9 r,oz))b n*hc0g RLC circuit containing a 50-W resistor, a 10-mF capacitor, oor9tnm)*b zgr )0c,hand a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coan5uzyqq5op8,ki ) p4 il in series?quz) y845,ipkq ap5no

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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*s ra frxk(tcwa+i9- ) resonant frequency of 10 cia-9aw*f) k+ (rxrtskHz?

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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 wi 1c-sjnuykv.) lr9ef;;jt 6 j1w:hcn yth a 3.7-mH inductor for a resonant frequency c;l-v1w :ksf r1teyj nh c9ujj.6y)n;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 ifs0 jp/v,qn8 uwgj-w0yv5lgt6h2f 9n n series with a 30-W resistor and a 40-mH coil if the resonant frequency hvpn 8wg0 jf/w ,q250ngjy-l tsuf9 v6of the circuit is to be 1000 Hz?

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