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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 flux excephl*re62);wtcmjqt 7 yfpl :w *t

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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 ycwpaytzr w6wle88b / 46,v f;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 loh 3ijlr zdq6eg(;q+6 oops of wire in a coil produces what kind of change on the inducedd g6rhil+6;oej3z(q q $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire c1vm:jz0*ae5ukg oe5 produces what kind ofmv55j*uo 1k az:c0gee change on the 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 kind of q3.xij q1/ t6bns(x 3l , ef(fgvzt+pwchange on the inducj,.3tx1(6f zp fn(t vlq gsxwq3e i/b+ed $emf$, 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 field an5 14k,ax spvwrvb80jd $emf$ 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 dfrnx-z x1(i 6jg:v o2pirection of an induced current in a conductor will be that which tends to produce which of the following ( o 1xjnrg zixf:2-pv6effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held +) klm ,k9wckvabove its cenk,mkw9lc+v k)ter with its 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 flat on a horizontal table. A bar 3qu5sd(0 lmafyu +. -f7d ung)clx9iwmagnet is held above its center with its north pole pointing dm(fauiudlyu0 59.-7 sf+ w3cldngx )qown, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vector poin(6 w.o hgu-vvgv65t h:s( kmspts straight up. The magnetic field vank(vg: hpogv-6us.(h 5v6wtsmishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a regi2n/ oh0* rvokfon where the magnetic field vector points straight up. The magnetic field suddenly grows str /2 ov0*hkfonronger. When viewed 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 hori5rl5g x3hnjo(zontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, whath3g 5 ojx5l(rn 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 tab uyfu1p zqp-*8le and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, tpp- 1 uyq*z8fuhe induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole en z 7dukn8o*5mytering first. As the north poz7*k5 ou8my dnle enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rd*th)l4 azdn(otated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field poi*zl h (natdd)4nts 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 wiremjgy 7w7m*3 wx/j.tid qwy-56, y nmev is rotated at constant angular speed about an axis whose direction can be varied. In a region where a unif76 md.*m,y5/jvy7wtnqjemwg y-3 i xworm 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.pq9n5n tt+)fy
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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 thahpwfs 9rt0 ::pt 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 magn gw 6-qs4dzrcfw:(;ftetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northward at6cjmruwyv+t(s g mzc 2t;y991 constant velocity through a magnetic fiel+vrt(tgc ymsmc9 z2j uw;y196d 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 constant angul*3ah40o alp kgar 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 trao, l( 2qvzz:pi c/wd,b.*wqggnsforms

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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 fre6a7 +tak s.i 8fgu yvr4n/qdq;quency of theq u vf i67anqg4t/8;r.+dyaks $emf$ 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 dekc -nh 8fo7qc5zgz0orizx6 5 0vice 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 device thatxpa;kld0 5h)b81 8uh:clo qxk

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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 thw lt2)4 hxgd)pe secondary coil contains more loops than the primary coil xp2wlg)h)4 dtthen 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 contagm - edr:q(/2gqwd)bo6/ 553zylvqm fz h1io eins more loops than the secondary coil then it iqoqimhy l6-f emq5r/z)v5z2o1g(gwdb/ e 3:d s 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 p u8 70;o:ghpq*p xru -c)iu)ubqlv kd4c/rwz0ower 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 circuit,+rdtmb24 50+jpd nlr o

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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 m(zsq b83 d7l,7c 32irix cfmhseries to an ideal battery of constant terminal voltage. At the m7cz7(c3h8fms,q ld3 i mrx2 iboment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal bn4(6 lu,f1hw izz.wawattery of constant terminal voltage. At the moment contact iw4zh u 1awzw(, l6fi.ns made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistanc1lxp;;m;qet le 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 cofhin9c8*fs u/u vjre6, ;p,opnnected 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 connected in series to a battery. The ti jmbo 4;6ja* ik.f7elrme constant for the circuit represents the time requiredj* m i;7efkal6b.rj4o for the current to reach

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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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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 tp-d+ e ;34 l78nfl.swuj7ez m9uztjnyo a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the curreedp 94n8;wll 3ez -.zs my7+jnjut7uf nt 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 excepg i94f :gefn/mhn9)ed t:

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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 circuit, t9x /1.cs+ 2r+m lk a54yvtoi)ywfaqiche 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 cjg5 vbt rnf q*38w7*fxonnected to an AC power supply. In this circuit, the currentbtvwn*rq78j5f3xf * g

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance k5 aqoz8x ( kwjkg ;b/.ppro)(in an ac circuit changes by what factor when the frequency is trip.gworkkk(( xp 85 /)p;oa jbzqled?

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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 isw4 g1 (,(nnz9qty0 g3lg0 fxzbc1jsof doubled, the inductive reactance of that indu, l00fzgfw9tg b1 3x(znc14 ogy(sqnjctor

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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 induqz s5i jb9g 8qq*5:z g6lovlgm9vk/r 4ctor approaches zero, the inductive rev5b si 58k: m9ljqzo lq/*vg 4g6g9zrqactance 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 cur znz)mo/a hf37ren nohfmz3a/7) zt

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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 changj ncq9dcu (4l,y)9k k73t mlcpes by what factor when the frequency is t(7mul39c y cpn9 dtkcjk,) 4lqripled?

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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 apk : 2i*ge4rjujproaches zero, the capacitive reactance of that capacit4*j r j2:iegkuor

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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 tzqx2ry)knz).ab 5:w ghe voltages of the inductor and capacitor in a RLC .zw 2 5nz: yxgq)r)abkseries circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defineb ciond;+ea97 hstw. 9d 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. The8h). nc ya ( / td2smy2 tar-8*0ilzhizoeeay; impedance of the circuit increases if R increases. When iz2 h-0)/(o8cl ayet ysaa2 ht *i8ye;m.idrzns this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance ofyv*d0jdyod (otj v28 ; 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 i4v rg9ocbam *.mpedance 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 series circuit, the u4kttb zn0h10b )bl9bezfxzx,+e..uresonant fre0 ,nbt. 4bzxuu ebh1lbz+ )z 0.9kxfetquency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that.x(lcrw ,o+le 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 cir2v llsi+ dx j:2cdc9n,cuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating irjv+wtkk+**8 le5s erwi 6z *xn a uniform magnetic field of 0.20 T. Find the magnetic flux through the look rtw5j6l++ 8seexwv z **rk*ip 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 uni9a 5asmxnj6k j6yfgasu c4*4* form magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane*c aus45s6gx*y9 a fj4jma6kn 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 fi q0rkq 6yy5i;held of 0.20 T. Find the magnetic flux through the loop when;q50yyrq6k hi 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 adjusw/p +u7zj/ alav2( lextable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes from z wh vm+3gmc -sdn;k*t 9d4li:$4.0 \times 10^{-5} \; Wb$ 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)cvvt 5fy(v tx2+b-n/+gm q ud 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 to 0 in 8.0 s, fi/ nc)b+v- y m+gvqf ud(ttv52xnd 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 turn85g4y vs arskzb9:8p ds 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 areaps5a p5hx a62l $0.20 \; m^{2}$ 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 60uh(,mrv7 7 1jfuod .ks/c3pm9 umy0d z m flies horizontally at a location where the downward component of the Earth's magnetic fielf d0y73(c/rm s.,79vpum1u jzoh mdku d 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 rotat60 v kfi*jgyr8b8vunke9/ y8cik 4 z-ses at a constant angular velocity of 2.0vr yk8/v694i jges k8uk8fbzy * n-ci0 rad/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional area of 8 w 3 bo1rnq7okw 7.gouv,kle1$0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of ab cp+47ds .soxj)f c5b3oav/crea $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. 6 k/yxxlbhp ch:k. yjmuh)i3 .(u-z;i Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm:z6kul3.p-ix bh./)(yhyihckxj u; m about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100fbj zf:.(kixpu :;7:mv epjkty dq2 (+ 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 generator3wo6nk tt9 r/os( 4s1gw ji2gn 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 rotwnj g9ss gtitko2/(wn16 r 3o4ating 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 with4pm;u o2l;ss9dv5vhf( gv- f d 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 res ao(g j,7,hqqi rft41grxvr;1istance 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 of 6.00 W. The motor operatesu, qj5kqp67 m)w rq5ut on 12uu 5r5m qjqwtp)6qk,70 V AC, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connectew-f n2on2 cx;m:z 4yky a:sda 9sd;)vld to a 24-V power supply. The operating current is 1.0 A. What is the start-s sz;d; wnf29k:) vn2x -yao alycm4:dup 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 mw v iztg*u/kb3-uh /*W is connected to a 24-V power supply. The operating current is *w/3ub*hk zit/-uvgm 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 conn)5gb z59dgw kqected to a 24-V power supply. The operating current is 1.0 A at full speed. What is t5bdw g9g5k)q zhe 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 neede;2 btjf .b:u9twe*myp d to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 2m wgzxf8fevy++4,iqrx1r6jh (avo0 A to flow in the secondary. How many turns are in the secondary?h1g426eq+r8i xrfv0 zyw(v fjmax,+o

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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 ar o.ygsdk7 8z2ze necessary in a 110-V primary if the 24-V secondary oz8yz.dks27g 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 tr89.asg.zt3kj a(zh hv*l l r0ka.,gprimary coil and a 2000-turn secondary coil. If the current in the secondary is 3.9*,a0.h(8zl.kgrtklvras ga .tj 3hz 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. Assuming 100% efficiepiw7bd4 l*ugdg ) j:cqh-p) b)ncy, how many amps at 24 lpbb c-u:)4 *w)qdj)h7 pg gidV 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 trkzg m+dpj;ekwz 19d78 ansformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What dk d8k1ep9z+zd w7m;gj oes 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 3 2y y*x.;)od(pqfgzi z00 turns on its secondary coil. If 120 V at 2.0 A is applqp;og i2)xz*fd(z yy. ied 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 cqzx hj5-cl/,mo06if ar q:*, f fk0ikuoil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what f*5 maj00i-i:6 fqxkkco/ h, qul,rzfcurrent 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 turnva.rcjexngh( : 23bm. s and its secondary has 200 turns. If the input current at the primary is 1(g.mjc r:benv2ha3. x00 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its sec:bq gw3t5wd)bondary has 200 turns. If the input volta)gbbq :twwd5 3ge to 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 has 100 turns and itseo+*eya+g ffzk)d: )w/ /kzhl secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary tegdyhzalo:+)fzwk*k/ + /f) eo 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 usually stepped 3)rmyocj 0-nvy53yy xup to 4500 V by a transformer and transmitted through a powo-5 3yy3mvnxj0)y ycrer 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 adha7r14c v db2uci( 8gt 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistan (g dadb41cv2ur7cih8 ce 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 6 .h+.wrrc1- mdp r/e( ceuhouV. 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 lost in .r1oec . uu cd+pm(rhw/hr6e -the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of r79go nklcs/n)b7ot, 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 rati7l/ sr )tbcnn9 ,gok7oo of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a totg*lab3ng ( dc;al resistance of 0.60 W. A generator produces 100 V at 70 nag; bld(cg *3A. 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 at 1000 V. How much le-in6ajc 1i4( jyj4dgoss power would be lost ino6j( 4 i-dijjgy4ac1f the power were 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 generator is 440 Vk lntuw x :w(/k*. o9d(txnur)xo p7o7 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 the power loss in lr9u*utx ww( nkotxo 7n)xkop/ .:d( 7transmission 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 ener rdr20di 6ojjjv5 6z(tiwg.j;ls+w. dgy is stored in the coil's magnetic figr65ilr;zvdwjj0+j 6d.i js2tw do. (eld?

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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 18-H inductor. .7g nrzbq ,b1g What is this circuit's time cog n1b.q,7b gzrnstant?

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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 wherghi txgv sz 20.n tf5:in/g3m4e 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 out: -f (;n,vayxow 6ug .zdjmvy3let. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outle--h: 9*hq8r( fvixxjy bean3-q8jfxl t. What is the resistance of the lamp8xh jj( rn8-ffeq i xal b:-y9-vhqx3*?

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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 arx6qz xpr3) ,e 120-V ac power supply. What is the peak current t),r 6r pzxe3qxhrough 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 supply. What is the power dissz do1tsyod9)j4mldr: a ,.h1l7j jh8z ipate1za7rd.)ld 1h ojht8sm z,4ld :yj 9ojd 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 resistor is1f87i(:qh3l wje ccogovt +y2 $I = 0.80 \sin (240 t)$. 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 resistor fepfehkne .f f. ym2;m26er; ;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 5r)kyms f- pwz5bu)b ao5s *6wis $I = 0.80 \sin (240 t)$. 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 inductor at 60 Hzz)u6upam fz lyct):w i f7u.;7?

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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 13y/1gpkb v r)i8mu4q-ujbtta( yl 4a reactance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reactj ao:o p9u+85 p/a;wadbp )kpbance?

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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 fo,wj+a( ( ca(gcftm 7jd/rzt9zr 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 fre c/cbhlz;:jcmo rzru5/)g 3q6quency of 20 kHz is appliehj r) m;rco gz5u6b:/l3/qzccd 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 th,acenozv4t gd1m+/2 hrough 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 o3 7hvef1p6hy,ouk: usf a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitbjvir.*7 7.nxejy t; kive 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 1 e1/j1bqnkt-p0-mF capacitor 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 th*p7g0 g:tb0 mz5y wh8gw-ep)dqbzxr 5e capacitive reactance of a 0.010-mF capacitor be 100 Wb )0-twpq:5 8mwx7 p*gbdg0 zhg5zr ey?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 5.0 Vksn ,hvacf 5reg n0bu3 ga3*.1?

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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 circuiq1p w7tu ;0g i/iaejts6 9e0tvt with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reacta7it906eq ia /t1ugwepvs j0;tnce?

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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-+z tz m:/zkgfreyt8c8ag 574kmH coil, and 1.0-mF r588 t7+/4: fzetkga m kzyzgccapacitor 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 as/cobx - *ih8awj 5e;7*itoxet 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connect*- 5xswoo/iae;8th7 * jibxeced 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.0 q50 rygv ythh/tadbik,3p/tor, what is the impedance r0hyg/idtv,0t3 5 hykapbq./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 withlkbxjfm3f 1 po-1tb. * a 20-mH inductor, what is the phase a 1b1pxtflkm*b.3jo f-ngle 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 nege twond/5e*df e)r */eded in a series circuit with a 20-mH coil and 1.0-mF capacitor/f/eno*ed* ret5gdw) for a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in ser. n8v b ebb)liog(6qb0ies with a 100-W resistor and 15-mH coil to get a total impedance oqb)v(gni.86e b bb0 lof 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 ib8q8 kh)r-arcd a3 e,rnductor at 5000 Hz for a total impe8ha-crbkqr8e ) ,a3r ddance 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. 5*vncj-o .(bkewp4,za m hrtu xz8.w00-MHz for a total impedance ofp( c -hz.t jbr.5amwuw80vx*k 4ezn ,o 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 capacitor. Wha cakz f)p9m qidqnu)*0n+ l60yt is the impedan)*ma i9 uq +)k d0pnn0czlf6qyce 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 capacitor at 1.0 kHud (g:,)epfdsz for a total imp)d(dsf egu, :pedance 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 capmo), s(uq v4r/q no)diacitor at 1.0 kHz for a phase iu q4(/omor)n vsq,)dangle 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 wcmbc k jx/*v(bj00a p:ith a 30-W resistor at 1.0 kHz for a total impedance of 45 Wam( kbjjbcpxv*:0/c 0 ?

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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 is l 1u)djyub /x)o3jn k*mi-rp33qncd 0 the phase aubdupr knx-30 m*n3)cjq1 j)y/oid 3lngle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.07+0qz: bzrifeji rih)) + nl*h-mF capacitor are connected ier * :izh ir)+zqb+lj7n)hf0in 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,xq jzb hjqyg(*f 537y 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 supply. What is thef y5yqqj(3 xg7j hzb*, 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*hzxy4 ol1 -z 7bsha2d an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz powe zzyhb74x21hl-s*od ar 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 resistor, a 11v0 azg q3w 6i6k9virs0-mF capacito30 ia9 qz6riwvv 6k1gsr, and 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 s+j t2k;aqmolr l0g2l3eries with a 500-W resistor for a phase angle of 2al3 o;l 02 +tjgqklrm$40^{\circ}$ 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 mnz eig)na 3;kq66v3bjF. At what frequency should the a;n6q z )e v3jgk36bincircuit 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 outpuz ds)tol75zzf) 3u, vnt in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power tz fv,z 3us)57)oldnzsupply?

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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 circ;(c)twx9 ok f9qjn vktu+ytb ozg.2-2uit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a r9oqacn r0 h5u/esistance of 30 W. What is theqan5 0cr/o 9hu 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 hd)l4as+2p abchq- iq ye3-:q series RLC circuit containing a 50-W resistor, a 10-mF capa q-hblha34 s)iqc ye2qd+ -p:acitor, 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-vw84ojkfsw k32cydj nt+- 0f3mF capacitor and a 15-mH coil in series?0ndkskf wt4j3y2vjwf3-co8 +

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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 seriezd sds: j7e4)i+k i8zg/-e slcs with a 4.7-mF capacitor for a resonant frequency of 10 kHz?sji i) -dkzezsl e:/g+csd 874

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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 inductorif ujbe8/. qq8 shy yk-9:uf+k for a resonant frequenifq-yu+/98su k.jfy8qb k: hecy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be plak2(:idxfe (ve,tf yx ;ced in series with a 30-W resistor and a 40-mH coil if fk (e(vt2, xeyi ;:fxdthe resonant frequency of the circuit is to be 1000 Hz?

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