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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://mail.51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 80，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://mail.51fly.win/test80.html  教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。
 作者: physics    总分: 142分  得分: _____________

答题人: 游客未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following arez.v4 f.vw2 i9(m tvial units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that th5ib,,tci8 zkk- 9szjde $emf$ 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 3kr e f7yow :w3;,1 wlcpyy1hsof loops of wire in a coil produces what kind of change on the induced oc :p3ly7eh, k1r3fy1 ;wsyww $emf$, assuming all other factors remain constant?

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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 loom(6 k75wcn 29r hyqpcpp of wire produces what kind of change on the mqcr knp62h5 (9w7yc pinduced $emf$, 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 nol t9hyd/: u(+oxx3k loop of wire produces what kind of change on the inducedt n/ouo d3y+ kx(9:lxh $emf$, 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 fif4 xzbia +r2s:eld an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conduku d-g+jwe6mo*wlj 6(ctor will be that which tends to produce go 6d e*lmwj+w6ukj(-which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flatzt c :eup(2 1s9shz3u3os.j nt on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from above2ptu oz:e3th1z3u9j.nsc ( ss)

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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 hele*o m,z d6(wawd above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewedwo zdaw*(m,6e 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 maicx0rmr9deiic 32 ; k*ixlrp+(4l mv;gnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed fropl ir;x24mid+x;ii cl(9cmre k *v3r0m 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 ley431iy+a-ofb pp r3xfvel table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, 1a-oxypif3yf prb 34+ what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the m/z*1*s /xmkxkom 5 ymoagnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the indmomz 1/ms/y5*xk*xko uced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasing xx,z(w 1fs8na cuazx ,(fsw8n1x rrent northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls tha+sue m 1f)f2xrough a loop of wire with the north pole entering first. As the north pole enters th 2+smf)xu1feae 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 coku d *,- scuqsk1 adt/7es4x8hs0t2im nstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic fi4c *0xmtkshu7s e8 - d,d2kt1isu/ saqeld points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant ad/ 5yreaxe -:mc )j4meqz0ca2ngular speed about an axis whose direction can be varied. In a rega0eeyma ce 2rd5qc-/x:zj)4 m ion 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.mpxpv) z 1)jid9e lf3)
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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 thayhp8cs 0ql79) rz(xzu moc 7h7t 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 fhjt9 0 hj+ t8e3lu k88czxgine 28.omzield. 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 mopg 2n4zml /izr. jor1 j0lsd3:ved northward at constant velocity through a magnetic field th.jn/ logi rld41s pjrm:zz032 at 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 ancwi.yah*0 ah-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 transfovjc6e .w) t x,hpcq( 3-+6rbmhigxfs5rms

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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. 1l+lhe 8 (myoqThe frequency of th hy(m +ql81eole $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used t0v(nf bbswox2up1 ,t(o s8(- (kstu nso

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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 dh -5ti++*ppdifi.f- alg)f c-wzj8 dievice 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 contaok 6im/2jpv :cban5xi,2 d7z93h tnc lins more loops than the primary coil then i z5/v nc htd :ilk79mboj36pxn2i,a 2ct is 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 loop4q/9fsw qh7 mg6d :avps than the secondary coil then hvp:fdgmw q94/qas 6 7it 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-je9xeks ))6c:uh7 bff8 ps mur 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 circuj6 3hijq,rol 6fk;1 fw+b*pkfit,

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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 8 osb7aj4sb5 9fmf 6jqideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resisto9fj8obs5m aqs 7jf4b6r is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battez, k9i(isrlvh -ar(/ vkgj1c6 ry of constant terminal volta vc(jhz1(ilk ar/6kirs gv9-,ge. At the 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 inductancevuu/l(h-y ,nj 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 resistance R is connected to an o7 dzw9:ms9d2n3ueex$emf$. 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 connected6(pihpir l ;4a in series to a battery. The time constant for the circuit represents tr6ap l;ih( ip4he time required 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 series to a battery. r.atf-0 z4gxq)w l8 jaol:7ig The battery is suddenly remr-xfg4qogt)lw z: ja ai0l 87.oved from the circuit. 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 the hl o(-o14 ywm ezxw9t sv.a91gsame 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 todpp*va35b r* (yfgmm 3comjg*f 0l65o 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 power supply. In this circuitdvmq+smf akmd3+ g0-( , the currents(d kmvf-0magm+dq+3

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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 ch 5 h6rmg wa/-7ts)otai-vle9g anges by what factor when the frequency is tripled gst-- hatviremwl9 )6 7g5a/o?

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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 inductivmy, - 5w0f ok9cmgmnc:85xaa qe reactance of 50 m5acn cfaxm w9y:k8q-go,mthat inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approacr a1mc:m q:g5/n vnvpv 9o :ul*1ytx-nhes zero, the inductive reactanc1l:g1n: 5on:m*9xv r-amtpu vycn qv/ e 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:exfrxok lvo1r /8j+el::x*tnop1 -g to an AC power supply. In this circuit, the currenoxeg8lf+:lr/1k-: pxev* rxno1 tj :o t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when the freqw0 m5;n:r14isz ot5n qjgd3kh uency is tripleddhqw;z5nko4r n 5is0 j1:t3mg?

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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 +b vyt ;(yowd.4vacmza6cdomk+j64*-iw( p tcapacitor approaches zero, the capacitive reactance of that c k4owbdzv c6t.;+yd64mop(-t+i (w*mj yaav 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 voltage(vm5xm olgec7e62+bb ;1hryx s of the inductor and capacitor in a RLC series circuit mb2r 7xlmey1;xgvc +oe( 56hb?

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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 dwt v63 pf s7-6hpldtcqe7; op-w k0y8RLC 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 circuik2b3sxbt s7i3t increases if R increases. When is this statemebs7sktx 33b2i nt 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 circuit increx(qir q1c1t 7zc4kh7 zases 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 lwpia2 ta-p;ndu76,h gs5wx ; 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 capacitanmd/(k izu sen; -e2gh(gj-2gxce both double in an LRC series circuit, the resonant frequency of thi s j;( 22nme x/edkuzgg-(-hgat 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 z8nfb)nmux 29bv6+ju*i mgm 8 driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLsjcntst1 mn 6 1c,9yt:C 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 radid gxpt3tj4cf0 56f hz/us 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic fluxgz ffcjt/t 6pd350hx4 through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic o/gens p) .+zlxu2z h-field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop az+pn.2 - elx oh/gsz)und the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniformque:yg qhl5vt6;o / o0 magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vec;g0uq:6ovt l oeyhq5/tor are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjust:k7lclm9u 8a ccer:w3able 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 fv8)ha;f8oqk5ma9iu * +m f0p, qvxkvorom $4.0 \times 10^{-5} \; Wb$ 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)h+phij cof: o(vvnc4 4w i;3w60msuo of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T)ohvfwmno6 s :p;4ci jhw3(i 4cvu o+0 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 wirel p2ci/c nq7,w(1mcs ul glp)g7bjs; 0 with 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 8k5wn) dl:ct r*y5sh cand area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at ayl9bh;fhy pmj(5 71a3k x5toz location where the downwarxo yj1a( bp5fhtyhz3mk; 7 l95d 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 a constant a8kmu53 -fwe*g o wkzy*ngular velocity of 2.0 rad/s about a vertical axis through one of its ends while inwy5-8ze mkkfuo* g*w 3 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 log yk6j:b/ urb,ops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns o;7rcl;jk ;a *c9b 5awr4owidjf 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 lone, h7 tos3dg2vpx2c5ops on its armature. 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 loop5 3s2t,xn2 gdev7 hpoc 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 cons-:b2 4nlg *gvpsm km2m3p*e apists 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 ge2fifim+s5e 7* v a-6mf(4x8uvs rt jsqnerator with an output of 12 V maximum when rotated at 60 sremx2v *-4t+5 ( f7sijsf8aifumq 6vHz. 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 wi.n )(s s zlusd;6v,qksth 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 operates ;wyzd*2sy 8v ht,v9 p32.orm3sxgkzf on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The m0c(jju hi;enk 5ce hz,5zy ,n9otor operates on 120 V AC, and when running yu,ehhc zn09 k;zcj,55 eijn( 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 tpxwtrr ) d5u-:ep0(5exwq1 jco a 24-V power supply. The opera1x(up:xj5decp0q erw5 )rt- wting current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistd/ 5askp; *hdwance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A w/ds*pak5;hd at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistancfx+ -k0-h ne0(wmjt vee 6.0 W is connected to a 24-V power supply. The operating currke- -em0j htvw0(fx+nent 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 a primary voltag esev0+ 6p7o7jqcvw h4e 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 primaryab ti- 42gmu;k ;lu1k4v)wjxg of a transformer causes 14 A to flow in the secondary. How many turns are in thexv lk;;gkji mu1)4ut42gb a-w 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 necessary in a 110wms k:*vk937vugn gi/-V primary if the 24-V secondary hagm3k7w/v:ks*ng u i 9vs 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 5c 7v wn+krt fc0 l-pr8kl.(kia 500-turn primary coil and a 2000-turn secondary coil. If the current in the secon8.r +tvrl -fc7klck( 0wi pk5ndary 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. Assby.:22 n 9juzz:m-so vzkdp5cd8 r2ejuming 100% efficiency, how many amps at 24 V ca zj zbm8-9npu2: edy5 .j2kc:o2vsrz dn flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provi(p9f ay 7s.msva.*2er ytfb9xdes 7500 V at 10.0 mA. The primary coil operates on 120 V. ef rbaas x.fyyv m.pt(29*s79 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 its stbtw2uy9 m+x0 ,u ph1mecondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present +uupymwh, 9xt2t bm10 in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and a:sfnqy8nq:- 300 turns on its secondary c ::s-yqqafn8n oil. If 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 m/hoamq8k6n1 am qe qm( nm-g eky(9fdxz:+/6turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the sm6:mmde8o 1aq6 kq fh9ekzga+(n qm/-m/x(yn econdary 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 secondzm nuj6bdk( u2w,uls3 n.y 4 tde6mz/9ary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to b6n umy6u(j/us4.93ddzbelwz2 mn k,te

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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. l um6i-v fdb/k+o)r5e(frl 9l If the power input to thd(e) mo +6lfuv-f rb9rkl/il5e primary 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 is usuallybc,yvf3s ..dvj u 7onhp84-fi stepped up to 450 u. .icp7f-bvs ,nvyojh4d3f8 0 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 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. The voltage is urjo ,qbx b*7c:sually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the :xorbqc7,*b j 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. T :pjk -azx3v+g76tmjnx7 zrq:he 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 lost in the transmission line if the voltage is not stepped:nj- 7 +x6 vzzk3q 7:gptrxjma up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A gener9s+t u6 xdt7jxator produces 100 V at 70 A. In orderxsx6u7 9j t+td to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original 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 longh -zw.2tcmcr1 has a 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 percentage of the original ene h.c 1mrt2-zcwrgy 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 less6uo./7hpxmzq power would be lost if the power wer m6p7 uxhq/o.ze transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generatok8xt;mryi8) kp)n i 9dr is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if )m 9pi)rik dtyxk;n 88the 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 mcr t) w4pi,s2l,m.db mt 7ba*yr:,uy5.0 A. How much energy is stored in the coil's magnetic fmr biy m) b7.y,4,updarw*l ts2cm,:tield?

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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 m,(m0b 8wlt*rbp a g)yi8:wnu contains a 6.0-W resistor and an 18-H inductor. What is this cuwrgpb8m:wbi( nlat8, )ym* 0ircuit'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 cirjbbq7 v6/g b/ 6cctz p7mb-gd)ub/h/ocuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peanb a16u8qv/c vk 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 120-5g opke3;nf*-5 x xtcmbs5+ hrV AC outlet. What is the resistance of the lamp?5p mxhebo*s 5g3k5t+ ;ncfxr-

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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 supply. What is the peak cuzxf2(g72bo7qbklj ,d fp0jt0 rrentt gxl22f0zb,b (f7d okjj q7p0 through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power su96lunll5pog5+ysy)gb p ,x7hpply. What is the power dissipatedb75gsyo)hy6lpl pnl9x,ug+5 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 rt9w 9wr. oue8ntfe 0 em;)1yowesistor 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-Welyqn o(ohpuz hk..*82fh98mo)* eh z resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50xprz hoil u 1g(a9r:yz(h,4(n -W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a qv2 8x24.*4tjxsj tlngdmb8 v,az zd81.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 10d *v dkl5cf*yk. w4ettszm7 deq,07m300 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 (c6 +dksw5zq7+ify xo 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;2d bhp l3e sk39(xnz/kkz mi-jp94 ml 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 s0b5tpq 2js :afrequency of 20 kHz is applied toq 05p2sat bsj: 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 throuii5mh jv m:h +y-37tjbgh a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacij5qxt: . x:t78 xmyeff gf)wq(tor 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 .gw owz) jsfh1*t4g9 bhave 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reglra88kw j25x actance 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.a xil//xm;n liytfz13)cf c3 reactance of a 0.010-mF capacitor be 100 W?xicfl n. ty3aclfx mi /31z;/)

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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 0.0019jje*1-qp: u 1 syr3 bk-lmbag0-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistadib4o,-oux/ qlh ;8 oznce, 15.0 W inductive reactance, and 108o4,ilu o bdzo;x/-qh.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 resisto4qer2e/szwrwfidn(h.tw.f /3) v :l.mum8ifr, 20-mH coil, and 1.0-mF caw. w4 :q/er/2t lrmnd.sh 83)f.i(izevw mffupacitor 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 resivdl4w)+7 eba v1: gx15 qrcfgqstor, 20-mH coil, and 1.0-mF capacitor are c)r:glf 7v+ec5x gq4d avw1b1q onnected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is tc*xfl2(g kgy .jao(9uhe impedance atx9y2l fo (g.cjkgu*( a 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, q;6+ .k vkl7zm 66fjssu xzox2what is the phase angle at 1000x.6zf76jxs+v km ;6kqsuloz2 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-m 0b*xrxqee xz*ozd 8o7xz4a3,of l7i (F capacitor for a total (x07xzbrezz4*ooxfo 8 dexa l ,q*i37impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resis b/is c8w;uxq7tor and 15-mH coil to get a total impedance of 110 W at 2000 Hz?/cq 7bsuw8; ix

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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, b 3nprhy6vw0u9 ot5e for a total impedan5ub6opt vh3y,rew9 0nce 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 at 1.0-MHzw c -o bqj.dkl,yyc126 for a totab 6,j 2okldwc-.1cyqyl impedance 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 in series with a 20-mF capapuda) ibap64:4dn3 zocitor. What is the imped3: 4obappi6 ) un4zaddance at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF axgod7kclt01 ls+8q)capacitor at 1.0 kHz for a total impedance of 45 W10t8lsa)gcd+ qo7kxl ?

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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 f vu hkh5sfw4fg2)3w.yor a phase a)s5 fw kh.w3f4h vu2gyngle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHn x-y:7k ;5fdosegsl9z for a total impedal7xfd9oe:y s- g;5nk snce of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What h+ yc:+,y h b/u49(z6*xeb jglzbfb jeis the phase anby z ujzfje+9 ,h: ch(/+y l4bbx*eg6bgle?

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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 resiss8u:f)gx d 7au ,8qj,9v)dtprwr7 u iztor, 20-mH coil, and 1.0-mF capacitor are connected in sepqid rruuf7g wz ):d tjau9)8 x8,7,vsries?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuitfed*o0jp,*,zc+0mmxcnuq/ v consists 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 suqm f/xcz*m*0pn ,+u0 jvcdeo ,pply. 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 W, and a0/* wz;fl pk8fhoudg/ sjm (x1n inductor of inductive reactance 30 W are connected in series to a 110-V, 60l k1/*ms0f8(j gu wd;x/zf oph-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 a 50-W resistoral,y d7m91( u,sveqwr, a 10-mF capacitor, andm9lsv a, uydewq7,1 r( a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in sero app fb:;-1zc.h -gopies with a 500-W resistor for a phase angle o1pb fg .opz:a ph-c;o-f $40^{\circ}$ 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*jk- 2k bm(jau9dbi /e r5.uit /xtcm7 what frequency ed2 i5ut-xm9m.a(bb kjr*c i7/uk jt/ should the circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit wiqzd;)s0 tw1 ghth 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance zw)sqg; 10dht, 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 AC circuit is xzc-scxhp2+r ,z q;2e$63^{\circ}$. 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.b qv00c0 gmuh+ What is the p+c gmqu0 hvb00ower 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(n3d jin 2ycw/ 50-W resistor, a 10-mF capacitor, and a /j i32wn cdn(y0.45-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.j 74z 8podawba;6 5vya*smp0 q0-mF capacitor and a 15-mH coil in series?; m*zasp8 p6odw yb457va qj0a

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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 xkwgss+m )+2v for a resonant frequenw)x s2 kgsmv++cy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant u 596vcu6: ,dicrgs ynfrequency ov,y: rin9uugccd6 56 sf 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 63/,o8tgk; n:6tdue6cui ji ad av3tl must be placed in series with a 30-W resistor and a 40-mH coil if the res jo;3 iag6 t/uac kli6nd3uet,dt8 :v6onant frequency of the circuit is to be 1000 Hz?

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