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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic zir5 h9qtf... mk.ho 8li4ezr 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 smn9xi08h b; kpz(mx3states 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 w20xq+d it6lkcire in a coil produces what kind of change on the induce cq26l0+ix kdtd $emf$, 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 throughwp ypghewk6i-1 ;,jf/ a loop of wire produces what kind of change on thewifkwpge/;p1-y6 hj , induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kr4fc 7 s)e5 xdcs()gmrno )t1qind of change on the indu)n rst(gm45e )sq7dxrc1)oc fced $emf$, 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 z(rgbasp1;.p4; nihk 3jy t1jfrom a 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 o9i9h 2c6bwnxw f an induced current in a conductor willxi 699cwhwb n2 be that which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. kd+/ o j5/sblmA bar magnet is held above its center with its north pslj/o+5b k/m dole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horitmc*xgp j(5 u3m;ix .9pv 3jwzzontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when 9.jm zjuitcxpp*w ;v3m5g 3 (xviewed 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 tavbz1x0p7(io c ble top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced curre0cbo7 1i (xpvznt in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic field ve r ks6 63:dzm735lujzc nq:ofzctor points straight up. The magnetic field suddenly grows stronger. When z:qmlk3 6nz7r s5:j ufd co36zviewed from above, 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 horizontalb4tp9fi-6b v0a5hh qa table top in a region where the magnetic field poi6taa9hi qp-bb 5hf4 0vnts 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 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 anic4c;w 06dusx(xfe; c lxav b +0jyj;/ ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. Wid+yjs4vu x(l wxc /6;0e; f0jcbac;xhen 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 wit1ldxe d(,bs 4y8rn3xvb+4lw zh the north pole entering first. As the north pole enters the wiryl3r nlxs1 v(x+44wbd 8b,ezde, 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 consta;5*uep1o +jk/ kdjj )f4tl4 7pstnqaont angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the ori; ue45d t+njafk7 jo*lkjpo / 1stq4)pentation 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 angulmfo(nh4nj.t- ar speed about an axis whose direction can be varied. In a region where a uniform magnetic field points(nfhjm t4n-o . 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. 6x5a)ufq 9gy r;jalb)n(owqq:qj 46vdw7th )
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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 a;j fxdi65sk4oq,n 5 u3ffpp*$emf$ 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 q rf4/.h,c muba magnetic 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-wewpo 0 jiu+t-4rst direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induc-j+upw r04t ioed 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 angular velocit:* djtql3mj 7ty $\omega$ 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 generatoe/l kjy6j rmxxlj h/o 6 )3+aa euhyv6b9+ah93r transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates throuw hn hi0a),wm;gh 60 revolutions each second. The frequency of tww, 0hma;h) inhe $emf$ 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 uket:ofr e;hu)e9u;8*j*: qylu 8brgkm wvi48sed 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 th8/nxkj; f wn ta 4,ffja1:.sutat

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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 secon9tu;uco2l hy t -y3qecy 70cw5dary coil contains more loops than the primary coil y92c7y-cw0;tt3yuhol ec 5 quthen it 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 loops than the secondaryi )p 3,py1qzf qib1sl3 coilz13qsi by l3pi1), pqf then 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 power inpuix g a9v03)xdnt

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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 resonantgu561scmpex )n63psad)rh+ )8y tx ah circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected inwg7 ocd.a;ww 3 series to an ideal battery of constant terminal voltage. At the moment contact is made witwaog d;3 .7wcwh the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are c ayspy2v exh 5hfh ;-r:cf4,3konnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the h2p,y xhkfh5 4a-:v;ry3 efsc 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 resistance R is connecvm 1e+sgk0v3 c5el:;q q0arddted 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 witpu7qq08f ocij7i8tf8 6d5seq h 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 resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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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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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are conn3 (qfvtc zq; cncv7b22ected in series to a battery. The time constant for the circuit represents the time requ(cq 2zcv;72b vtf 3qcnired 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.x)yqbm 37c;vj The battery is suddenly removed from the circuit. The time constant for of j7) mx cvq;by3the 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 same units except: uc+msx4yi 6+ u9)yuaia- vw0a

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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 circuit3jfp406 tr/s4dz vckb )n2xg y, 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 t6x:sad;qa4 2 l9im 31ntc zmoso an AC power supply. In this circuit, the currentn 21 m9 zxid 6:;q4alamtcoss3

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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 eyr d: v b/mt1m*:+eukwhen the frequency is tripledkmy*tr1m/u+d: :ev e b?

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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 ac my3 w*tbv+ue+ross an inductor is doubled, the inductive reactance of that ind+ +tymev*wub3uctor

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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 a 3cv3*rmcisu/cross an inductor approaches zero, the inductive reactance of thauc*i 3srm/3v ct 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 nq nu5e m0i1.jconnected to an AC power supply. In this circuit, the curreu e1.jiqn0m5n nt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance bhudm84v9y/asth*- pin an ac circuit changes by what factor when the frequencydup8/b4m- sy9a*hth v is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approachyz/ 7u. 5vf3imbl1dt pes zero, the capacz /m1fbyp5 i73v.tldu itive reactance 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 an6ncn y23e5 w/uo9ie avf3evp9d capacitor in a RLne9 yieoa539/cwpuvn ef62v3C 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 RLC cimda;d + 1z)w1nfg1rbbrcuit 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 ince 3ft3 yi0lv;xx+zh9inn/ s ,thu j.cw+,oy 9lreases if R increases. When is this statementn ,zi9i.,yclu vx0jfo/h93s ye+ hw xn3tl+;t 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 out g2t1+dz.qwx i+j. qf 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 circuitv 5(5i2s3jo -.j8ls za umtzez. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC s4g/)lin7g xb9kv:yqcf 5owi/ eries circuit, the resonant frequency of thaci:b vixy)fk/ /gn54lg w7 9qot 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 9: to 0l -vwj;,) pkqmfma5epbthat is 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 RLC circuit occu 1oek( xn rxg,xv86 y;f6w1qrtrs 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 rotating in a uniform magnetic ff:dz cg8-u7ffh7 3prd ield of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are paralle f3- u:dc77hg8fpd rfzl.

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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 unir )au*4k/.y;d4qf(pfp v .ma a2csesg form magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane 4uym2cd ..epaa; (4p ) f*rkafq sg/vsof the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of rj3uu77,f be t ) iv5,daad1uppadius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux d u3 aieuua, ,p)p1vdt7bfj75through 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 c iehg*.e:bi,:*q-ckgz-lyg 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 coildc feq hrs6 . 9-5;ep4brwl*gdm5*iuv changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame withqkh7s ujo0b-fqm. .vx k+/(lkw7v hn, sides 18 cm. A uniform magnetic field is applied perpendicular to .,wvu /sqk.oh7b-0nm k7fjx (+h kvqlthe plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 tc e 4n(w 7ze+pxu+:tqeurns 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 ar., p:yghw6nym-d0r: 9 fjg/wn s dfwk*ea $0.20 \; m^{2}$ 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 wingfvbl 5d f*.6)iaapcd/ span of 60 m flies horizontally at a location where the downward component of the Earth's mf.a/ i6f)av bcl* 5dpdagnetic 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 angular f6h ix.4 z4ugrvelocity of 2.0 rad/s about a vertical axis through one of its ends while in a co .ru6 4gxhfz4instant 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 loopungkfb1j v 7qf(i s:p6crhh(owr906*t:n :bw s 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 +gf:bh.3/o zvuajta* 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 rectangulqq+fx5ei8 8ap.e 1i80f vzbmzar loops 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 lzfm88iq5.p ie1+fzaxeqb0v8 oop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire ta* m n/wtu8b;vza/9rof 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 constrwulvj2tyzval 84)m 4/c-pfj :eu;r6 ouct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rp 6tvw2z8em /c :y4 ;r-ofjljaluu)v4otating 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 generato9msi9k cnzmen;*g);i r with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC) ox )w0ll(hchqda8z3 motor have a 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 have a resistance mh ch d 7tnk(e.+eh:.zof 6.00 W. The motor operates on 120 V AC, and when running at full speed it g7+cmh.eenkz:.(d h htenerates 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 resisteg au:+k0nzgwu r x3vu9(3.tnance 6.0 W is connected to a 24-V power supply. The opeu(kxeugtn g3n :z 0.rv9+wau3rating 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 resistance 6.0 W is connected tolu t1 h8:+in*ucp bp5x a 24-V power supply. The operating current is 1.0 A a bh51*u+p:icx n p8ultt full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supplyysqs+m;v m g88. The operating;q m8mgv+y8ss current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary volo,0z abel32ygtage 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 agyy e+bmqg)9ud. *: jcd0x g7jie/n3to flow in the secondary. How many turns agj7mjin) xe qyecdb ua*y. 390 g:g+/dre in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if txjqp cg,42f e:he 24-V secc:qxg, ejf42 pondary 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 btn1c6 xlm0i fsu4) x.coil and a 2000-turn secondary coil. If the current6mnsi)0tlf. xcu 1x4b in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformerjid x75mkw -x.1xmb8u0ii*e3lms co o6i 4(dd. Assuming 100% efficiency, how many amps at 24 V can flowi-xl 51w0oxm udm*e7c8 bi o.dd( imx3jk i64s 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 provid+u n13ofiq (xyes 7500 V at 10.0 mA. The primary coil operates on 120 V. What (i+ xyufon1q3does 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 itq)n emv05j3om:h cw r9s primary coil and 300 turns on its secondary coil. If nwe5qc0h:mo 3mv) 9rj 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 tu,-knh( h967esrd 6j4o frz hohrns on its secondary coild,h 4f6-7s rk(6hhojo9nzr eh . 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 turns and its secondary has 200 turj mp(zl q;j;0tns. If the input current at the primary is 100 A, we can expect the output current at thezpm(; j;0jlqt 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*wk yp8v2w5k1q krld 2 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we8k*kv pwwq 2r dy2kl15 can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary hi+t 1hurrp 3f6as 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losse6+ft3 i h1rurps)

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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 x(dyi16 (6 l3u; md pqppq;lcs120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power lineqx mqdsc6pp(( 6;yul13l i; dp 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 6/,rqf6w3j lfv 0 A of current 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. Find the percentage power w, fqj 3lr6vf/lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually sch3n rw (p,5hstepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Fin 3hscn5(pwr ,hd 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 f0pme-i. nx+n 8nsg+hhas 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 10hm 8gxp+ne+ s.-fn n0i0:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A gene5.ryix9b6 yy2js:lmm );b zmvrator produces 100 V at 70 A. In order to reduce energy loss due to heating of the tm symivzbb;.59jm: 6ylr) yx2ransmission line, the voltage 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 downa5vfl x ), q1s+kx,zsf a 6-W line at 1000 V. How much less power would be lost if the power were transmits l ,a+skv,qxff)5 1zxted 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 to be transmitted er kjt:5jt6(am- aa /don a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformertrda-(/ja 6kaj m:te5 if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in6k,ee (8ytrt8zv( wdftw . co- the coil's magnetic tfy6w8d.r,e(co- (t8zekt wv 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( dn+9s 5acruqzhj5 2s 6.0-W resistor and an 18-H inductor. What is this circuit's time const+ 295hjaz d(russ5c nqant?

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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 circuiter ldel/sh81l7 78i,kj9bt xb 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 outlep; t(y.;o oeyom9pgl) t. 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 int)8z p( uual3rco a 120-V AC outlet. What is the resistance of the la)r38z pua lcu(mp?

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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 conn.k wal6 /k,lselyzq4 fg 239dwected to a 120-V ac power supply. What is the peak current th.9d ,wlyslgwq4 alf/k3ze2 6krough 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 con59ceiq*fx q(- uctxc -nected to a 120-V ac power supply. What is the power dissipated in the xc-t- ex cuqc5 q9f(i*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-W7ocg7 o x*aqx7jf*:rq resistor 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.qs 7belhk9r+ resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor ( l*hs(0kl89i exhk hot8b jly:w 3)ezis $I = 0.80 \sin (240 t)$. 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.f2 i(rqod.m/fq-k (mt0-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 1000 Hnb- ;2uc*qs lmd:i/ ppz?

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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 inductiors8 67t oxsgy( edqloj5 0uq,o3 h3e-ve reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance acph n(v/ +nj.+bti6hct 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 a4qz1g c:r:3 wh6qsm8omq y yju0fh7 ;ft a frequency of 20 kHz is rsy6m:wq1;fjqz8:o7m3qh gc 04 y hfuapplied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz source6nhnj8+z )3 sn9pcgh n?

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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 reactacqzqorcz 1.v4f gk ;d*m241k once 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 haful/xr 0th,i81c wy +3rl fm9fve 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 fwxun *b qj24glal0hk vpp1; 37oko++a reactance 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 capacitsn661ifryp3ni*p .yg)g1 xi iive reactance of a 0.010-mF capacitor be 100 W6if 1ps6x.i iy py3nrn1i)gg* ?

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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-mF22-cf8beu7 k ;,pbj ps4j(ato yjht5 b 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.y/fxrd8 ;z(pxmm4pw re)42ff 0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactar;y4p xp/mfxw82 )edr4zfmf( nce?

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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 15bnbt/l1)a va8 00 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are cln1aba)vb/8 tonnected 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 /wte 1el ihi*nr0e;e4 at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connecteih/t;eene 1ri w *l4e0d 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 w-xfedu/6ncmb . b3 yl hxd(14mith a 20-mH inductor, what is the impedance at 1000 Hz?l3- (4m/y 16 bucxxhn fe.mdbd

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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 . c +jm45csmt5bufya: v1 r9fhin series with a 20-mH inductor, what is the phase angle atc c+1j:v4f hum5sfym5 br9a. t 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 series circuit42+detm4 gyym/v6 su r with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 Wv4m u 6m 4d+2steg/yry 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 7l xd sof1)nz7100-W resistor and 15-mH coil toxn lo17zfs 7)d get a 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 with a 450-mH inductor at 500x0c1o3 o1xjerzc w5;z0 Hz for a total i1 ccxz1w jx;0ozeo r53mpedance 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 bz1; .9 nxda w5 ww3o7:om cygxty+ma3he put in series with a 100-kW resistor at 1.0-MHz for a total7o+m wgxy3w9nd. m5t3oa:;z c1 xyawh 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 20nlof 94rm-bz 7i-*y : uu sgi3w4leko--mF capacitor. What is the impedance at 1000 -isyu:mnz3 * o4bflliw79g- oe-4ukr Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.1vt 9sfq-fz( /on)qm q0 kHz for a total impedaq nqmt()- /qsf9o z1fvnce 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 kghpqs5 a34wc5/qx6kk :un xq8Hz for a phase angle of5 qq u4n:8g6xs5 cpkkw/axq3h $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz d 8 l/ucpmy-(it 57p.wf kt2ghfor a total impedance of 45 Wypfk2 mdtp.-7h(l gctwi 5u/8?

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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 tfo 8b90c sd1+ j mhiylj8/uc6with a 100-mF capacitor at 120 Hz. What is the phase a l1dou+ js9 tc/i6by cfm808jhngle?

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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 co+ tnhs1zc f3tq)7zje 0il, and 1.0-3hsj t70 nfe)tqz1 c+zmF capacitor 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 consists of a 100-W resistor, a 10.0-mF capaci3b puc1h6 lzv dl5hmzza6+-g1 tor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What6bh1c+ z35ap zm1lvdg 6l -hzu 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 Wbb((n2 pbb1k 6 ahbp5a, a capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected ibbpa(b p(h51b 6a2k bnn 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 circui tub7(vqs mvy 7bs8e79t containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected toq9vst8byse7u (7b v7 m 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 angle o. y y+/cmro9iz/mc .+9o iyzyrf $40^{\circ}$ 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 z1u.c7yu0fdzo (m ak2de2pui ; )(tpz= 10.0 mF. At what frequency should the circud em( t21z2ukzpc)ydzu;fa oip(. u 70it 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 with 12.0 W respjw9fe. a1sy+)c5 zoxistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 12. + f5paozej)csx9y 1w0-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 r(vtql8a k).v 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 aemwv+xxtcx gg6kp:.92*. d rrnd a resistance of 30 W. What is the:xxkt9 m26+ eg.vrp. c*wr xdg power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W rt/u *hevy1pw yfqzq-09 .y5yaesistor, a 10-mF capacih zytya* 0qw- yup v19fy.eq/5tor, and 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 coil in ss qp0(/zgz;at il* nsu +nu+v.eries?q + lazn/ns0*vg;u(up+ zst. 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-ek20d 6t h8zwsd1zt s 301gdujmF capacitor for a resonant frequency sweud 3 1s h1tdg8 6t20jdzk0zof 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 inp; m)u(;xg7utc zak (kxv;:xnductor for a resonant frequency of 10(c xpukn z x;akm v;xgt:);(u700 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 musta9jkta;p78 jx be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to bet; j8xap k9j7a 1000 Hz?

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