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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 mag rshceenf ,7ovqb86 3+4r7efdnetic 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 inductio9g9s(zn w4ui;l*o kwvn 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 pxhcdj ;.1mr2s-hhsy + roduces what kind of change on the ind2.jdhch+-1 ;ys mr hxsuced $emf$, 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 jr-0jh/rgay . ub 8ki.through a loop of wire produces what kind of change on the agb/ u0hr .jki-.8r jyinduced $emf$, 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 wirudun2l2yoi(4ts pxi4-( i lom2x y*9j e produces what kind of change on the induceds2idi ynt(o( 94ply*2x u-il2ouxjm4 $emf$, 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 fio0vn5u+ +exdvgi+ -o jeld 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+nc*; 1evkz luhwa6 q2n a conductor will be that which tends to produce which of the following effects?w+* ha16;nuczel2 qk v

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is 2h0hs.,(yxy o w , zaqg y,upha7l*8bdheld above its center with its north pole po,h 8ha oqy.a*p0lyz(uwbh,7 xd ,g sy2inting down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontazz:llp7y, wb oxf ;lm: k:/rz:l table. A bar magnet is held above its center with its north po 7bkxp:z m;o wz,yl:l:l: zfr/le pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vector poixa/3wx fjm+2 ints straight up. The magnetic field vanishes sudxi3mf/xj w+2a denly. 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 regioyr(h,) m6;ibwtkk :; ,qada ajn where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field inhj :)qatdiymk6k; w; ,ar(,a bcreases?

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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 r. 5lyv8 l(:w-szxomumb/* 9dgdftt m (egion where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current -o. l:m(z5msygvdxb t (u98 t/fd w*mlin 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 ever-increasing jg3hc- yw6 ecvv),j9/ 3tdzcpcurrent northward. Two coils of wire lie flat on the table, one on either side o,jc39wp- chd6v/v3z ety g) jcf the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of jc;d2k7mt5( )fio ev iwire with the north pole entering first. As theo2(j7efkvdt ; cmi)i 5 north pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant an,,2svbwnjah0q-i i 14iba* sogular speed about an axis whose direction can be varied. In a region where a uniform mag1vw, i-a2jbh s*a04bo sqni,inetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constanmw * . td4ioihii09yr4d5e+ dvt angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points strat4 hi0m5d vidi.i4oew d9 y+r*ight 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.72ps)bg ,llgub r v5*i
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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 21vhyhyt:t*p $emf$ 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. Th64wc+hq yubjv21p/k/ 24q zzpy7auya e $emf$ 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 d7u2-ooc,b yg :+ jkb:ql kg7,ikzpg/virection) is moved northward at constant velocity through a magnetic field that, 7k lcg: v+,bq b2y/kgg:7kpi-zu joo points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant anodo(3 5zcf3cf) qhl p2gular 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 transformwd(es 3ds98ewo /vqh :s

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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 6s8c i.*/ atfnk0 revolutions each second. The frequency of the cfa /nti.8* sk$emf$ 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 devic/ e2rzy.znbu)g dqa/ f x;nu),e 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 devicv ;qn ,:/rt9-qijxtfk e that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops tham5fxxoufpizn)9yo1 :2; j dc1n the primary coil then it is a:mi fo9o)fpcu 1j2x 51nd; yzx

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the r4:t3pw lxz1d secondary coil then it:lpr td1x 3zw4 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 power inpur x/ .snuma-r,t

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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 circuivqlzwp9+3f+to.aya 5 t,

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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 of const(fl di/* x3yyvant te * (3vfixyly/drminal 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 inducto8rs1f)bw sqm 4py3h+ya ;hj zx)j t8j7r are connected in series to an ideal battery of constant terminal voltage. At trmh4+j3ft)j a bq8yjp)hx s871 s;wyzhe moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with q3o-09d fcy4jgs c yb,inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and ra.xu+-qd2o 1kiddo/do ;asfj:nu1,xesistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are x5nn1.7 nlv 0jrrp0f m0jgu/p connected in series to a battery. The time constant for the circuit represents the time requil nv jn fmu n7x1p/j.00r5rp0gred for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in seri:j a7bol4bvw m .k)io )kc +b5h3q(azyes to a battery. The battery is suddenly removed from the circuit. k m34jw kabcybzao7l(b.io+))5 v hq: The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have t0x l2dz0iz9yk y68nkahe 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. On this c:z mm; hnr(:n,aj qj*kircuit, 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. Iwwl)j 4qfxq;b5(2adu n this circuit, the curren)lx; 4 afb(jwudw2q5 qt

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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 yacx951hy.3dj ww l: uthe frequency is tri9 yj:x3chdwa 5uw .ly1pled?

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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, the inducti cq2m3xm4*8oh okkex4b(r; f qve reactance of that inductorembo4k fo4 qqm8* 23rk; xx(ch

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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 voltcirlunc8r adn3.,nx18f yr.eh ts ( plzd3(*)age across an inductor approaches zero, the inductive reanrf prxnddi. 8 1(r33ucsyel h(c)8.zt,a*lnctance 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 -k2q b8jab 9z.pm:(dr qdo/aqan AC power supply. In this circuit, the current8.( rapz/9db2b qqj-do:qam k

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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 a s)yb( cnl*)trn ac circuit changes by what factor when the frequency is tripnbl*t)syc r )(led?

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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 capaci4q(z8 o* r .3 fvefvnr9axfkf4tor approaches zero, the capacitive reacta fvr a*3z(e4 98f.ofnqxfv4 krnce 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 inductor and capacitor in ay.fzl.yxo , a7 RLC seriesl, 7z.yy.faxo circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is6qaly60mbvn-* q1:gq3 nxgxb/b z ;zh 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 increaserf y4 d k z24-rs;f7wwd6jaog5s. When is thisfzwfr5 gra;67jsdo 4- 2w 4dyk 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 circurcc(gow,(4,vp m lh0 eit. The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit inc pfr+oen666sy reases 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( cx9 kns*lo7*no jp6-u wk.q 8rsm,yl double in an LRC series circuit, the resonant frequency of tyollr osnj*.kn-qms9( *pw8cx,7 6k u hat 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 voltag7 qa dp68corux u8(i5ne. 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 circuit5 r+.5fxvpfed 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.vlbys34x1llkzz2)pd4 p r.6 z 10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and zl4 2 xzbpl.3p4drl6zv k1 sy)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 qa/( r5wnodi ;is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the owa/d;q(n5riloop 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 as85ti s-v+7jcyi 9,b mxf; qerotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop qft 7 abj 5+8 ix,i-vy;mc9esswhen 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 arey-+xihrif ;b nfh;- wqf4 ch3v12-ey la of an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes from qsh;390 9egq:dfvp c7lti 9em$4.0 \times 10^{-5} \; Wb$ 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-iyw lgxkmub2 (n-qtkig:9hi p:-k .6 frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field chankqxm. kl : i6b-uwg2 i phtki(-y9n:g-ges 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 andrmjhg s aicq7-m;q 9 n32xi62u3c4bhv 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 ij s7.p-7 ,ap2qp )ba+0fajfjo1bc a marea $0.20 \; m^{2}$ 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 locaa:y zuy0f7 p7+w4i knjtion where the downward component of the yn f j+akwi7z:4y7u 0pEarth'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 2.0m q69t/ud oq:n m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends qdt6:/on 9uqmwhile 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 areill1jj8;b,-3 3z5s ksekjocf a of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wir cecwt+r+2;x(hv;gg wi/ln5 me 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 is 12 cmxoog6 0 t7lv7m 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 perpend6 golmovx7 7t0icular 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 consistsz9tk go)b5lvkr sud8.f;g 38r4g0p zc 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 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 output of 1m z7 okw,:+-zgf d9fjg2 V maximum when rotated azz:w7 o9jgmfgf- +d,kt 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator withxes/ubywvhpj 9t ( 26/ 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 v8)cgxfu3 5sh3jo/jscbu8* v resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor hu)(gew wp-w of24qlg8ave a resistance of 6.00 W. The motor operates on 120gp u2(-)f48 wwoleqg w 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 to a 24-;u (jtpyt-re,ae5 i c3e(bp svn m;(w7V power supply. The operating current is 1.0 A. What is the staape(vt- tec(5 pen ,m w7;jby(3i;srurt-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 un9), zj)l- sxguc5:m6hifgiresistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at fuig)mgxu c69l fz-)jiusn:5h ,ll 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 connecte/ca,u5k)m 7p/ sa bip8q(f jsed to a 24-V power supply. The operating current is 1.0 A at full,5abs/j ie (qp8pamu sfk7c)/ 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 needeyxf8w(/v6mysu7cx4 dy po b +/d to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primaaav y6j7c,r;l ry of a transformer causes 14 A to flow in the secondary. a7cjlya ;6rv, 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 -owj-iyoo4z(8y ,m ht 40txpdare necessary in a 110-V primary if the 24-V secon zo,o0wjyo4m4tht--p8x ( iyd dary 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 primary coil and a 2000-turn seconda4g w,tn/ bdu;nry coil. If the current in the secondary;/ugn4dbwt, n 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 the primary of a transformer. Astydtcf6(e y+xs h12,xsuming 100% efficiency, how many amps at 24 V can flo 2exhxc(, sy+dt1y6 ftw in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. The lkgs60uhqo 4 c2+c4 oxp3z o:aprimary coil operooqhp40: 4 l 2gcaxkcszo+6u3 ates 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 turns on its primary coil and 300 turns on )yq)fmwn0 m b b:ek;v.its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is presentn0b; bvqk.w )yefm:)m 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 i2n8 t7 e3kn no9hb(nn60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is appl n(koie8 9nnbn2ht73n ied 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 tu71m8zqyrw59 c 3g,j- oy *yy( axnoeznrns. If the input current at the primary is 100 A, we can ry-oynw8 zx1,ecj gzq(a79m 5yy on3*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 100 turns and its secofvm)0:seon hu9,s,15sw8j ocr/sl g jndary has 200 turns. If the input voltage to t0ojsgs,frcl8umw) ,v/:1eosn5j s h 9 he 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 transfo6gis)vvm*t 7 vrmer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secosm 7t6vvv)* igndary 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 0:akg1sf(m/ kkvks/x is usually stepped up to 4500 V by a transformer and transmitted throkxk( /v fk:10gsmk/saugh a power line 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 cu ln1ns(8hpg a8rrent at 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. a1hns (glp8n8 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. Tle:v45d0lxcv+r(fbtn0 zfi 4he 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 perc+5i:bf d l xlv40vf4ctnze 0(rentage 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 as+ hd1z:7 :slvkrpqxj/2j ts 8 total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What ppzdjx/ l8s tqk 7svjr1h2: +s:ercentage 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 tq 9g, sro m71puq(fe1W. 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 r tr s,91f eq7puqg1o(matio 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 p8 d0g6)ymogy zower would be lost if the power were transmitted at 3000 V instead oy m0dy6oz8gg )f 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 1-3-o aibu1r ; 4ph8apslkzjton a line with resistance of 0.60 W. To what voltage mp1-pb4ai1a83-stz hou ;jrklust 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 A. How much ene n,z)d,smdxhk7ir;e ( rgy is stored in the coil's magnetics7ddm,i, x()ek z; rhn 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-W1s , 1x uvbytszc1k2e) resistor and an 18-H inductor. What is this circuit's time consta zku1xvb,1scye 1t 2)snt?

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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 vd-e*2xeq1+4iwc9pixmi unxk ;l v(hq0-d l: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 ACaa174 t 8j;ycf p dg;eyjzt 8-5eb4zic 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. W+,iqikx,dp)/nc f+ nvhat is the resistance of the lamp ni,+xi)+fvn,/q cpk d?

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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 powerw b21m5 dizoy6 t qru6ta7do23 supply. What is the peak current through the resdai66to2 qu3o2 dby7w z1tr 5mistor?

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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 supplq-4fy9/ p3z h-mmdrihy. What is the power dissipated in the resistor?mi-q phm4 /zdh-yrf39

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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 re 5fr w- w7pk+51tbqhdosistor 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 resist1ds,d( tkv3q)ug:zt aor 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 r55y;xdas9rqjgmr ( u4esistor 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 inductou (m o xugc f6cc/n82gjt9hv35r at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil ac2oldx,sc(wkz0n;a3 t 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 inductivuxb*n1 9n,x sie 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 a hsw1 wm+95uz/*iejdfor 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequenc 8dic1 0qt ;-twp-rmabl(7grpy of 20 kHz is applied to i7 d-qr0 1tpabgl 8mr; wp-i(tct?

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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 source?qp0m;rdna78 uaf+aa 3

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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 4.7ivvv 4 ncbg;u0 :u8(do-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 capacitive reactance wbh1tcmyfuyf ;)kk(p.r91e + ib -:rgat 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 r tfer;,f:hamp :c51 2i5xceisti(7o 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor qu/:uhw hi./u6,kfk m 9xlz)kbe 100 W:k9) zu. h ix/6/huklf,qmkwu?

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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,ileh b(k sxffx2+ 8+n e5*jmf 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 abyv(f*0 p m* hx+wkz1sn ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitm*1*svb p0wxy +kz hf(ive 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 coidru23h v6whn+4m e :col, and 1.0-mF capacitor hwe6 vu:rd3mhn+2 co4are 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) px.5hj(2 s(zqlwvme at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in sjx(zwq).(pheml s5 v2 eries?

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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 the d x*eiwyg8w ;3s 7o1;rsg6ikn impe 1w*;g3sod7x iiwyk r;sg8ne6dance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in6 +wom*h9+wq-vz 86ks oze vbi series with a 20-mH inductor, what is the phase angle at 1000 Hzhem+wiovzvs6 bo-9 6 wk*8 q+z?

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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 ang;gee 2bk)wu6 d 1.0-mF capacitor for a to6eg ube 2;gw)ktal 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 capa4ywag3m7 ;bik k(0wjecitances is needed in series with a 100-W resistor and 15-mH coil to get wjwm(7 ;i3 gb40 ekkyaa 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 w 9d3 ;d-rgh+ 94lu dem2mr3f2 aqtxakaith a 450-mH inductor at 5000 Hz for a total impedance of edaf 2u3hrd l9km4-mrat92gx d+;a3q 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 10s,ox,( ei 0gw5efdh l;0-kW resistor at 1.0-MHz for a total impedan0ifs,h(g d x5l;eoew,ce of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in3c:/e h- (0hxruwc vus series with a 20-mF capacitor. What is the imped(-v/wx:cruc he0s h u3ance at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in se ce yw641drsr9ries with a 10-mF capacitor at 1.0 kHz for a total impedance91wyc r4er6ds 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 a21.( kbs, drire ejb*gt 1.0 kHz for a phase angle of bd1e *kr2j sei,(g.rb $40^{\circ}$?

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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 30a.(amh4psqa djxj 4lf4 -e 64h-W resistor at 1.0 kHz for a total imf l446aa4 qshxa (jmpjeh4.- dpedance 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. Whatto;qhsad 0 6hk8 30q.ppbfx, l is the phas bp qhfp6t;3hl qx.0so0a 8dk,e 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 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0o3,9y*cnod s2r jf ;by-mF c ofd rbjy;2nsc,3* yo9apacitor 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 cons i .k5x,pbh98nnjodg*ists 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 supplyb,oh pgdnnk j589*i.x. 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 reactance 30 Wl rf tt70-c3 cjgg.f-k, and an inductor of inductive reactance 30 W are conneljkf 3 7cf.r-c-tgt 0gcted 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 containing akv8e m, a1hhu0 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when con0 kh1h 8uve,amnected 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-W resistor for a phase b/ n) 3q6sompuangle of moq 3pu/snb)6 $40^{\circ}$ 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 frequenrvm51pf6q c) jh)yxjre7p 9g/cy should the circuit be driven in order to have maximum power transferred fromr/)j v1xg9fe j)cp57p yh rm6q 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, 151nuz v) rm:f9n y2k 0xhaz(n/l.0 W inlhfu(/ryvn90 m x:)n zk a21znductive reactance, 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 ACudt ozb+ aux9e0157fc 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. What isi bq9)0)i c9puea8nb6 1 grosb the pu 9n98sirb)boa 60ib c)epq1g ower 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 50-W resistorp27z4u o 0*mb g:ubjfq, a 10-mF capacitor, and a 0.45-H inductbmfuujp o427bq:0zg * or, 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 freqpqiz7*khse +svary 4zg-7 zg 26h;)f yuency of a 1.0-mF capacitor and a 15-mH coil in series?7fr;*s)k-+ h2zsq gye 47 hagzvzy6p i

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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 resonant fru gq 56+q55dt7m xmunnequency of u 55u n7tq+6dqgx5nmm10 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 ./o9 .d x fsslww:y/2ve)sfjsseries with a 3.7-mH inductor for a resonant frequency of 1000 Hz/sexd9)f.2vwls/f soy:sw.j ?

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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 4r*6 -p)ti a2y:v azat+egmzu4 a)uxd*0-mH coil if t:z4*)vurayap za2u6taed-g *m)x+i the resonant frequency of the circuit is to be 1000 Hz?

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