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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://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://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 rwa mlt tav+5q-+e4 p: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 cd )o,0lk,till1rf)v 5f5byf-2 jz b fthat 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 6i ,;i e5pscdpcoil produces what kind of change on ti e ,6;dip5spche induced $emf$, 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 strengt4-csp0ipshp-6q fqy5pnk 0* eh of the magnetic field through a loop of wire produces what kind of change on the iek0q*p5-snq pi04psfch y6 p-nduced $emf$, 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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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of w7oq 1yr5xxnc;r7bq7s ire produces what kind of change on the induced sy7 5xr7xq1c;n bq7ro$emf$, 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 akdgt2dk9l7 2p magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an40kcec 0xd)y id+p (1tf6owjl3 uyxb + induced current in a conductor will be that c e4l6wfxb(pid1kxy j 0 to3y0++ )udcwhich 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 horizb)wb 38; -lvxnasypf*ontal table. A bar magnet is held above its center with its*8nf-p x;b)swva l3by north pole 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 f4bp b)snf9kh0lat on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approacheb 4p0)kf9hsnb s 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 kj. xu )0dku+jqw b/8*1g1yvfou l u,fvector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as yod+lv k11 bg*.jfj x/0,) uwqk8f uuuthe 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 regiophxf- rp rz8.px w8w3p4ir /x1n 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 asrp zxw8xp 41/ixw-p.r 38frhp 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 reg .6eb c:qg8uw,ycs y tgew6l1-ion where the magnetic field points sgc6lbyu8 6sw-ecg: qye. w,1ttraight 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 an ever-increasi7dvqom28jbj4 al rh/(ng current northward. Two coils of wire lie flat on the table, onvja7 dhmol4 qrb/ 2(8je 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 through a*coi.j;amga0 c8nn k4px l,mfk 72l k+ loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed from above0klk+ nkl8p4i2 ;gn,c.*cf x 7ajmao m)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis wwgcnp* 1dg4vjz. (+akhose direction can be varied. Izc.gn(kavgj+*4 dp 1 wn a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about t5rk p8 v7q2k*r6dpa oan axis whose direction can be varied. In a region where a uniform magnetic fi rdvqa2*kpro8 7tp6 5keld 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.l)ag8tr hin26
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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 th,(+sp2ju;6;pf ww a;k9ds al tcw*k 4gbks:kyat 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 m10dn1 g0,k44rjumgl(or u ordagnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moveg/hh5tsi cw3b, ji9d *d northward at constanbs hhdti,cg /i39w*5 jt velocity through a magnetic field that 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 o;h5 ; vlp3)jb z(pzqqtz-(pwconstant angular 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 trk9q 7 c3 q.ei3m2 xlcjrcvwo826 2oodxansforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The f p6s .fta3,e d;jxzlb:requency of thexfd:sl, 6ap3zetb;j . $emf$ 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 de nge6ep ezu*) yd98l:bvice 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 des8gh lyig--rtx4e m 59vice 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 thanqs oz-xn2a-a + the primary coil thq -zao2a+sx -nen 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 pr7mf4y;juw9p/n;x8 dt mwd ji5 imary coil contains more loops than the secondary coil thjm/i d 7tuy;dw9;845m jwpnfx en 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 ib2: s +kv,y os7)qfpdqnput

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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 circulha iy93v g 5:q525 fb,dzyhkrit,

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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 cons88kapno/ d9w;+syyz nected in series to an ideal battery of constant terminal voltage. At the moment contact is mao +syz/8y8 s;pnawd9kde with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are co d.f2y0uu wc(snnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inducd2cwf(u suy 0.tor 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 connected to( cy/5bcyi9wh 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 w2pamx)wx3p)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 conne-z e8srm,ns(j0jmjb)y9d+ s8x3oprbcted in series to a battery. The time constant for the circuit represents 8me9+ bjb8(jr30,m -djzs) osn ypxsrthe 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 inducl li2qsxk qzdb0/0x. uhb 3..wtor are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the .3/0l .bxbhw.du0zsxl kqi 2qcircuit 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 t y/i+ jvsno )ra(x*h fk9+.niche 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.tn9vyn m)7p* wll0g a6 gg4yw. 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 supplyas;w-z4bm;ddr2 5 kxg2 9xm ch. In this circuit, the currenta4- cd zhm; rmx;92xb2sgwd5k

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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 8vihk.p(d;xcy- +b. yabdz 9 ewhen the frequency is tr hxz;8( k.pbyav.+d9- ydcbei ipled?

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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 teb0 n 99(0huu)m mxkxdoubled, the inductive reactance of the(u990xhmk0 xbn )tu mat 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 inductor05ow)w5j9m7ic+lzk ak w6 lkm approaches zero, the inductive reko9) cal7z kmlmwwi 6 5wj5k0+actance 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 an AC power supply. In this circuit, the curr8w ssiri)u j85e5uswij )i8s r8nt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactan-j8uz6 uf hlsqv8.gr)ce in an ac circuit changes by what factor when the frequency if 6ujhg)qsv8z - lur8.s 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 approaches esa ;ms7uw /+kom 6a.czero, the capac.s;s +am67 u/aecw mokitive 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 thhcx5a3uwy)gvc 0i,k b q9 5e,a.htxr5 e voltages of the inductor and capacitor in a RLC series chu5c309) bxx ighke5avc,aqyt .w, r5ircuit?

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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 cido sm + z3+cr0ig7-kx (kvzilmb,:q)ircuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases ity9+q0 ye/c)6irv3 8.hhpp ont m5ysvf R increases. When is this statement tro0pht6ypny y 3qm c5r+ s98ie/v.)th vue?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuiqy263owm .ca st. 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 dor-*s6j (y ) tau; 2pm1qzlchimpedance 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 botht6 0kf rvyu047q6gfa q double in an LRC series circuit, the resonant frequency of that circuit7v0qf6q0 kf6ru 4gyta will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At res b1z6r+.4mfkgl rb84oq*yjozonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs.+lsyu s of,;e. i5gokq; qw4a 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 fiel3vy8e l-jo(gz*gic u6d of 0.20 T. Find the magnetic flux througheoz83 -ylc(gv6 ug*j i 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 unif: c73mkeo t7muorm magnetic field of 0.20 T. Find the magnetic flux througme7: o u73cmtkh the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fielmn/ gp8n+t+:u)nc v xa*yycq6d of 0.20 T. Find the magnetic fl cxp 8t+vn qmycun/ +n:ga6*)yux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is redul+/vbd niizcy7 v3o( ;u.s-w uced 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 chueao. 49zcnbu5 q1+,ntd.n3ct v0vje anges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a squolhjf;;tth46 are frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the tlhhoj6 4;f;t 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 w 1lf kr5hb9/yye jk3k9ith 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 ap rss*i6uag k/ng v;b/6spn)od ,;mm+nd 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 wi q tk51b9o.2bs+wer hm.gqq.7t.tkxs ng span of 60 m flies horizontally at a location where the downward component of the Earth's magnetic field isxg+t.osr .qk7b tktqsb.h w592e1q m. $6.0 \times 10^{-5} \; T$. 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 rotatw 3unt+j 9wew/jy y1gh1o266c3nqc.af h+f xzes at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while inq ywngcyf 3 j91 +oc23t w6zw6 ex+juh.ha1/fn 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 habks mtk9,2utn -f+*tsuf-+cts 50 loops 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 12ozrq5p p)9p z00 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular lov753i gakj di6ops 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 d5i3iak7 j6vgloop 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 of ar i/8wb9vguusnr 6jac anf10v jx4+d *,ea $0.090 \; m^{2}$ 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 3zsg3e1xwbe54nn:g2t gfq1 hgenerator with an output of 12 V maximum when rotate3bgqg1hzf2e xgnn:451w3s ted at 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 generatorkaj4:rn.8 :gkaodwsd9ak v/3 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 motor has;/v w2akkl+,ty1 ydvve 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 havetm;erq8w4hr :-i 1a nz a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generhz: 41;r qeawn tmri-8ates 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-V power sup i0pl509fq sarvhx/ 5sply. The operating current is 1.0 A. What is the start-aph5 vs009xrf/i5l qsup 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 to a 241axur f +stw65-V power supply. The ope5ts fr1auw+ x6rating current is 1.0 A 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 resistance 6.0 W is connected to a 24-3s1h*/6utk qiitc nb .V power supply. The operating current is. t/ui kthc6i*q1 n3bs 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 reduclrnpsl h.;3 p/bvi/ 4ye 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 primary of a transformer causes 14 A to flow 5wp+xgy tli/o.5lkc0 in the secondary. How many turns are in lipc5w lx0ygkto+5/ . 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 /j/xq5xam k6;sn6 qxs necessary in a 110-V primary if the 24-V secondary has 1; /j/5 k66qmxsqxnsxa00 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 pw:.e mo 619w91t jsruxy(potarimary coil and a 2000-turn secondary coil. If the current in the second.6sjoe99towa1:pmr txy 1(u wary 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. A n8l9zp-6+z3 g fgm,y9rtityzssuming 100% efficiency, how many amps at 2g8 r3zgy nt-t6m 9y+pfl,z zi94 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign to/ 1d*0vc9aae9rjpw ) rv 4ocbransformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. Whw0oca *d 9/14vj veoabpr 9rc)at 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 ac(c0,jqs 5 m2fl-a qnlr3bl660 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A isllq 0 bm5,njf qcr236la( s-ac 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 turnzrn c0 :zl*eug 08vyr8s on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, whe8v grlcu:zr 0nzy 08*at 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 trans ts 2(nh*en6ur:t5inn kvk3q2 former has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at t :runthtq3sn 25kv62(*nki nehe 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 secondary has au+)gy+o:rn y, av.b k200 turns. If the input voltage yga )a,yokn r:u+b.+ vto the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer pbq) em;fet;hb(ms 52 has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect thep )e;(b5m;tsfbh2mqe 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 ofqi htci7r 9) 3drn4f8u current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and trans38t4undi c7rh )ir fq9mitted 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 fyzt k3oxstv24 6 f(knf5w-d6is usually stepped up to 4500 V by a transformer and trafn66vyxw4 fo t( ftkk35z d2-snsmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepped 7b 7w(x+tfr xkmfe e)1up 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 linb+ x)tem rxefk7(7w1fe 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 a total resistance of 0.60 W.2.ck :nr1aqq. vtim f; A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltqnim2vt .;r1fakq :c.age 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 vbw 8)o4yukjp,my +e.50 km long has a total resistance of 0.60 W. A generator producp4v wu8+b,)m yky o.jees 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 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 azm, ;vf;fa77 vw,tfmj t 1000 V. How much less power would be lost if the power were transmitted at 3000 V iw;mfvaf mt7,v 7,fjz;nstead 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 on nw isg d u3z7;;,wok;ua line with resistance of 0.60 W. To what voltage must the generator output 3i n,udw g7kuzw;;o; sbe stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in a: 3w-rnq0pk r qo4hx3the coil's magnetic fieq pnow 0hx3k3-r:qa4r ld?

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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-W resistor and an k; t wl3mv03rd18-H inductor. What is this circuit's time cons3m ;vrw 3ktdl0tant?

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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 rms38agny:az :ahoyy vj/5 2b - )ii;qzjf 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/kdr 4-nwlbvq(t2,t d 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 in5ny(f r/3vw mh)x. miuto a 120-V AC outlet. What is the resistance of the lamp?u(rfn3.y) m 5 mxhwiv/

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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 condl,j yh;4d-:s- awr mb2tcw +rnected to a 120-V ac power supply. What is the peak current through the resisto s+mab2trhy4 w,d wc;d--:lrjr?

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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 supply. What is tx ,6rrvk/.5 zer mg+bjhe power dissipated in m6 ej zk5,rr/g vbxr.+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 resisto2 ixbu,y .po+rr 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 resisy:+vm:nr3b m0tkvfp -b96 )0uzzfgfgtor 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 isbjavt wl3+ )hk ; ne/ccb0to3+ $I = 0.80 \sin (240 t)$. 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 inducniaz/ms ;5eb-h 0b 8butor 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 10gyb2i/o )eouf*bh 3b000 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 induc3o+n5lv :kfo ,qp)w dzyle6cql7c:z+tive 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 inpi)b(ly9l)q*s h6y3rl vm rl 1ductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 kHz5d chg q*y2ic+ is applied to itdgc25qchy +* i?

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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 sourwthn5 ;cy ze. x ;au2lw(ybw2/ce?

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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(9 pn naplfs2be) p49s reactance 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 h7kk2 i1g046 zrhbsmf* +tstvvwe:k* have 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 capa2(lfspz /b 1xgcitor have 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 capacitive reactance of a 0.;ac ;.r 9:so ts vuijny( gmce91,3sog010-mF capacitor be 100 Wu.9nov ermj c13csso 9t;asiy;:, (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-mF capacitor at 1000 Hz7jo *hjpy3n: q 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 l* vjda6hc)c(with 12.0 W resistance, 15.0 W inductive reactance, andjc6dvcl )h* (a 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, ak6whs dhqxx7 chu fv l,q.f7*8l2-g e(nd 1.0-mF capacitor are connected in lx*6svchfud7h f, l ekqq8 h.7-gx2(wseries?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.*t:y 2 2mu: evgfxl4do0-mF ca2:x geft2 :mvl4u*yd opacitor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH induc )netj v*b)6ydtor, what is the impe6* yt)dv)bjne dance 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 in series with a 20-mH inductc8oy-6 ;nl exxor, what is the phase an -lcyo6en x8;xgle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is ne1om 0 b2doog:veded in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 101m ogovdb: 0o20 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 followink* +azro9h j5*fv oo4xg capacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hz?ka9*4o 5ofz*x+rj voh

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must bd)-7 1fowtyd3l l qsy8e put in series with a 450-mH inductor at 5000 Hz for a totw)yll doqfd8t7s-3y 1al impedance 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 k.*(btz2ox4kx wgky+ at 1.0-MHz for a total impedance of 150 kWkbgkkt4*( woyxxz 2+.?

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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 seik5e0bqm/h/85 d83 zpy gp(uu yjf4 wories with a 20-mF capacitor. What is the impedance at 100ypfyg b 8 u5h ojk/mz8 /(ie5pdu4wq300 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 wi,6fc3izfff x2th a 10-mF capacitor at 1.0 kHz for a totalf6f3z,2cx fif impedance 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 witfsqy0eyhj,0vh 5o 8g-;/gf nlh a 10-mF capacitor at 1.0 kHz for a phase angyonyl ;0v8 s /,-g 5hfq0fjehgle 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 kHz fo(aq wqnk,3x 4y4i bq; l,mvib/r a total imivkby ,3(l4imqqb; / nax q4,wpedance 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 / df;laf0ckb/8+sp b jseries with a 100-mF capacitor at 120 Hz. What is the phase angled ;f /ljb/s8 kabcfp+0?

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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 + 1f/w28nmseqza +uqp V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capaci1zf+se m 2aqpwu/8q n+tor 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-tbr)4e*27d vl v3 9pm2edd woszw40 hmW resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuiv4hmwdtem z2 epw)2r097v*b3l4o ds d t?

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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 an inductor8th: 9mourv*/:uh2o) ljuzvzi o cv,8 of inductive reactance 30 W are:vozuul8zu ochv,/ 2*v)h 8:it9mrjo connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50.l/3qz 2fbydj -W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz zqly 3 2/jd.bfpower 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 series2c i z:,q h.r/y; wshg2n*vov.c;y jkn with a 500-W resistor for a phase angle of c;.shkj 2i v,ohn c/ynq:z;w*v. 2ryg$40^{\circ}$ 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.y9*6 mg 5itb8ceug;kn At what frequencybcn 5m;8 6e9ukity gg* 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 outpoirzl;/3,ir+j j j3(cqvz+ yx ut in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10+xrjzqy3 o jzlvc(+i3i;/r, j.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 AC circuit irw v du:j49i1;c+)v2 jivlf cos $63^{\circ}$. 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 o (j5ed +gd rzw (3,iu2e,b/u t* phkdxupa:4mrf 60 W and a resistance of 30 W. What is the power facazwgeu 4(rpd , h 2jirxekt+du/*pudm,:35 b(tor?

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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 circuit0oqln8 l ,blwo:48 pgp containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H,gwo0lqlpoplnb: 48 8 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 co,b9fej v 2b8rvil in series?8e2b j vvf,rb9

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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 w/fwc h:tj)m/rith a 4.7-mF capacitor for a resonant frequenc r/ :jtw)fh/mcy 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 wi b5)tt -skwwb vj 8(em/(ezly:th a 3.7-mH inductor for a resonant frequency oeyb)ke t (lv- swmb(8:w5/tjzf 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30s*c90vm xy2bnwfr 8 9h-W resistor and a 40-mH coil if the resonan0y82s9*rnhbc f w mx9vt frequency of the circuit is to be 1000 Hz?

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