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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 u42p9 nmb:v rad)02zdij1ivi lnits of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction su-6-k z5cu.wr nwr t;itates that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of change onawf x(ue(9h5bwk jp;+tui9 /t the inducebk/j+aei(twup tu fw9h5 ;x(9d $emf$, 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 produces whatpmgw* x.2hrr7s z ;z.4oct4lw kind ow4rh xzo2;z tp7rg4wlc .sm* .f 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 w.aok2(ed0d (jgpal: ar+3tr pire produces what kind of change on the induce( dao a+gltp:rr a.ej0d32p(k d $emf$, 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 aq0+jf4oqxztx( ekq17- +fh 0 d2lp gjjn $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced curref6/azo4ag 2d mos nzp(/tf(7gnt in a conductor will be that which tends to produce wsg(/ffag po tz/a4d mn(o276zhich 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. A bar magn 1xq rm/4ppztl1p3e h*di4 yw9h7idf4et is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from x z w*iphd/4 dm7elpypt1h4qri 4f319above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is heh)viai+: xk is4 e yi41gzp,h0ld above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from,has)hv ki :i pgx14+iz0ie4y 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 6znx0bkg ng9;fq qg 9 r9br:j0points straight up. The magnetic fie:bqrg90q b z9nng ;jg90frx6kld vanishes 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 i dpbd05j rmt)(n a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed fromb td)p dmj(5r0 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 horizontal table top in a region where the magnetic;n8g f ne*ljk -w;xsx: field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the sx; g:;wne*nkl jx 8-ffield 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/tv4nd*)zndbfsp 0 /g horizontal table 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, the induced current cir d)d/ s*vn0g/4bnfz ptcles

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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 throug6u2 *)u*e7m hxcdltjvh a loop of wire with the north pole entering first. As the north pole enters the wirxh*lj cu d7 )e*t2mu6ve, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant s,g( /dd e1u(8ncuwhzangular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis ofwezun(8huddg sc/,(1 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 an axis whoseqs s95tsip1 v1 direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axi1v i159s stspqs 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.16lsopv;ht m*
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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 i crh8ipiez7t.qx8pmob/-6: that 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 magnet:(v nqn;j1 vzjkv :1lci,wrm .ic 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 easu / qs+f8c m2ky3/xroqtzcy2 8t-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential inscqymfqyz8ur 3oc +tx2/ 8 k/2duced 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 baryg76s.r*f *0umb(ji h.kdfij rotates at a constant 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 transf.6;xl qyvaq 3eorms

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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 sec /8u63 jo /cym9lptgvxond. The frequency of the/y96xct3j lu mgv/8po $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used tod -9kdm h,g4li

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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 devt3yx6cb/s 1 y6q+v( egh*hingice 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 tha2n1bm 9 xyrbe7n the primary coilxy2bn 9re m1b7 then 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 prim,ze0zh hbir0.81 eehm ary coil contains more loops than the secondary coil thenr i ,hme .e800ebhzzh1 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 inp (mlg3xflqg4 x(h;7arkq 5o 2lut

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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 circzsr 9up;+ksu3 uit,

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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 co9x7(ai6s 2 ngpa+v(hxionph9 nnected in series to an ideal battery of constant term7a9o6 ngxv(+pni92i hhsa (pxinal voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an indugel4 87gu/2ktgtxn s br - k*1n.eefz(ctor are connected in series to an ideal battery of constant terminbfg.4ue2 t-( 8 ek/g*rn17zks eglnxtal voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is conneoz2f0 - h6gecected 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 conoq2a,o l3o20iekkk n s,9k5 kxk 0l2nonected 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. - w-it3lpj,4* c/siahh+ l ozw The time constant for the circuit represents the t4, 3+pjcw st-hlilaz*-/oih wime required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery.3(( s g)v7h4hsmh s7ri ppdx+(be*khe The battery is suddenly removed from the circuit. The time constant for of the circuit represents the tkigssm *h(ph7h3b +7e((xer4hd s v)pime 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 uni k/b5t xvrulr:7re04 sts except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On thistk ))//bnoqh x circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this cb3me-uk0 3ur/ew,8 ahdx e2pjircuit, the currentka/ e0djm32wpuh -e8 u e3xrb,

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactancr0g9xq/9 d 4hs;rg bbve in an ac circuit changes by what factor when the frequency is trig qb rrb9h9gxv0d;s4/pled?

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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 vhvlnzj.)h aye d*4 0.yoltage across an inductor is doubled, the inductive reactance of that ie.*hh)aldy yn.4 v0jznductor

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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 ac2-*+ubtv q, . d sgt7fec9fvwcross an inductor approaches zero, the inductive reactancwdb qfs.-+,t 2g fcuve9*vt7 ce 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 circuitl0eq.hff1hz ) zqq)*m, the current e1zfm q.h fql))*0qzh

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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 ir. xay+y gc65x*wjh /circuit changes by what factor when the frequea6ry wxc5*h.x j/+yg incy 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 acx6yc;;dnls* x ross a capacitor approaches zero, the capacitive reactance of that capacis 6dncx y;x;l*tor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor in a h 2cjb)2cfm +xo gi4l6RLC series circuo 4+bcglmcj2f6h )ix 2it?

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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 aggpn-u jor+ .6n RLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance ofobsml7bcd15 8 0bcq 7t the circuit increases if R increases. When is this s7t5bc ombc 8 dq7sl01btatement 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 circui 1xhhxr r*)z1gsm( ahv cr+y8,t. The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit increases ifvnqzdhsxwd7 hgv3v2;9 m +)j/ $X_C$ 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 capa) ot-u4r.lyutjp lp(8citance both double in an LRC series circuit, the resonan(jopr)y u 48ul-p.tlt t frequency 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 is driven by an AC applo.; rff;h6jc p:l8 xt55d ds9ya. edzaied 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 i1q .0-wi2vn 9lzrs vrRLC circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fioyqh,h2 x4rpp 6(7-s hje b58 ;piuhcyeld of 0.20 T. Find t coep i yq8xh7y4s ;(ph pu5hhr,2b6j-he magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10djno)e:cir 1bc8aa 9/ m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and thena9 o:1ibrc 8)djeca/ 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 field e4mti.zluk ,.of 0.20 T. Find the magnetic flux through the loop when the plane of the loop andzil4tuk ,em.. 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 lo/xnxmh xte*e v.1on o3)+k2nmop 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 ns t1ml/uult8e3y)mg0n,/g2a9iuzl $4.0 \times 10^{-5} \; Wb$ 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 witd (i* ks84eyn7dw;x yoh 200 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is appn*w;oy k7edis (dyx48 lied perpendicular to the 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 turns and an area )nn7 jomcwb0- 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 ando 2m;un-/ebz j area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies hoqo7z 8bw, a4x2oji tk/rizontally at a location where the downq kxota8 j/7b,wz2i4oward component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant y +nydgz +bk8sf3j)p;angular velocity of 2.0 rad/s about a3 p8bdynsgjfk++)z y; 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 generat n d:a+yln+azrfd7)f74o1rzkor has 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 100 turns of wire of areh5x3 b+ wrzt gvr+w/n5a $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is 12 cm lnzhe.nj y k*b;s9 nn/9ong and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will bk*h/ e .99nnzsn nj;ybe 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 oqsx5ci.nm g w ,e,t99af 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 construch*8asd)kyo5hmfaq 2h- d9vm9t a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is avah km a8ad)df5qs9vy*hm2-oh9 ilable. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maximuo 26xyxs2j 68b u+uzjvi 4:ziom $emf$ 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 resistand ycgr-s 96no,ce 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 +b9t7b;/t :whihz*zwd khp8w operates on 120 V AC, and when running at full speed it generates a bhi w p; /zh w7+dzh:wtkb9t8*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 s.gc 9l4y0t1-sije td wupply. The operating cue ygt9 d0c4i1t-jws.lrrent 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 connebbhx50:)y gf. ptbm7octed to a 24-V power supply. The operating current is 7b t)bg5 yfxop .:0bmh1.0 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 resb1m,/nn jpou/istance 6.0 W is connected to a 24-V power supply. The operating current im/1unn/,bjp o s 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 needa-v)j9ro))rllql 7b hed 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 A to fl-8gm0etc vzijq 8q:m3kmg fe ar,gi: +u756doow in the secondary. Hoom umvcqkd:r,g378+:a q mg g80-ii5zjet 6efw many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns a c)6-r0wzh *oq3 agwdere necessary in a 110-V primary if the 24-V secondary c 0wh6 qzd e3-ow*)raghas 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 ofws)7+ cgk:eh s a 500-turn primary coil and a 2000-turn secondary coil. If the current in )s : he+7sgwkcthe 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 transformer. Assumi7 hm.x ; unbe *g*oy,1xxm.qonng 100% efficiency, how many amps at 24 V can flow 1o* gm.yo7xqhn;* eum b.xx,n 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 neoluz7olh /l m0 /6pk:bfn sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primal mf/l 0pub76l:k/hoz ry 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/ydik0u +p- kv 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is av- iuk 0ykd+p/pplied 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 o pwq,nj iu/6mgn ,t,0ba 7p5ebn its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the s5 jgb 70,p6,u/wbann iqpem t,econdary?

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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 sj ((l k7qdox5secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current atlxdksj (7q o5( 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 100ih))a9s s1hj0oj;u d t8oy: pd turns and its secondary has 200 turns. If the input voltage to the primary io9 si0)t:8da1yjj uhhd)s po;s 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 its secondary has 200 turnkrqd+dxy6t0 * s. If the power input to the primary 6txryqd0k d+* is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltmtq2sn 3(kdeqf.3 g(p j6vv+iage is usually stepped up to 4500 V bs qk32 +gd (evt(j vni3m6p.qfy a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltagibv1 vv+ s 2xkmw5q0o)e is usually stepped up to 4500 V by a transformer and transmitted through a m21o xwv05qk vbi)sv+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 steimjq tnk 3:k1j7kf:8 1w7nwxipped up to 4500 V by a transformer and transmitted through a power line n7k jmq:wx7wi t:81jk1k f3inof total resistance 1.0 W. Find 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 jf)q:9a9bt1rgzc t-, 6hdx imhas 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 zat9)dhf1g:9icbr, xt6q -mj 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 5glnqltv/*8 dp spg;t -,7( cts0 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the trp 8*p (c 7,/vtgq s;-ldgtntslansformer 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 amg4nl4 +h*6is ixkmz* t 1000 V. How much less power would be lost if the power were transmitted at 3000 V instkmm i+4zs gl*nx4h*6iead 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 d ,2*4g2etl jvthght1 to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a dlth*1tv2ge4,gjht 2 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 i ac7qyxnb5um: 3)t; wpcxc2 t7n the coil's magnx 3;p atuwcxnt: m5)27yqcc7 betic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and mu,xh7tm( wb4mxq7/ fan 18-H inductor. What is this circuit's time m,x7/4bh wu(mf7x m tqconstant?

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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 t gj f3dmgo)w:7he 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 g* nk4y5dhd9a: ;mcjloutlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What i45hv.udh5j1mxr 65 qql 9wjta:cl+b is the resistance of the lahtq l 5r5xmv cqh6.uj 9l4a15w:idbj+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 connected to a 120-V ac poi+ 3s mwrj,)//i .tvtohz z5hnwer supply. What is the peak current through+tt3 .ios,zwhmrhvi /j)n5z / 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 poog ,5bdt je5 rd05)b(xq7,ctxq ni0qj wer supply. What is the power dissipated in the resist 5jxq(qdb d5,trqgie0, 0no x7cb)j t5or?

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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 resisp+u5 m63avy yxrredviv w/ o,)4 ie85itor 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 resist(k5pbka ud/n66i u c4lor 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 resistoqqjwqb8zxp. de)y y 81s:5r;cr is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance ofa4td iw;4bju, a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of0f/wz pv3r *mg 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 coh(l +pmgcg0)1 jbxi43 nt fm(iil have 14.0 W of inductive 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 at 106hxgx ,tcs/5o8z gse( 00 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 9*kg1m0jwqf u nomu u-b-0gm3inductor when 120 V AC at a frequency of 20 kHz is appliedumu- *90 gguwknfq om0b3- m1j 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,v gz.0p anlv *+(okj+.axqn l .1mymt/ 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capa. 3*hlrty hum7citor 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 capacitivlc0.kl a*zg 9vm-ic eq l9/p:s:nc lh/e 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 hasknb.w2v. 4q nn7*czeve 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 0.010-mF capdhs(1a a-e2xq w zkx:*acitor be 100 W?*2azq-x1:ews(h axk d

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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 ca w+jjidg3y tla133 k6dpacitor 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 circs8 r:;rl)/p kuodd.u 1a6uw lcuit with 12.0 W resistance, 15.0 W inductive reactance,;w c/a.sr uuopd:)l86kl1rud and 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, and 1;( vvfj0)2m*yh wxy bx.0-mF capacitor are connecte;m wyxb2x*vf (vyj) h0d in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mdmb2 *grwn bt:+6u;d: ypvk b6F capacitor are connected indn: mwb ;: rv2+dk b*tugypb66 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 20-5i (/qx j:skw:3t uaonmH inductor, what is the impedance a (3jns qu :5xoikw:/tat 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 connecmt xutd:y r 939k.tz4n* aij)wted in series with a 20-mH inductor, what is the phase angle w:t9tty )z34 u j x.*rin9mkdaat 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 circuit with bt1h u(j5dph,a 20-mH coil and 1.0-mF capacitor for a b 5p(djh1,uh ttotal 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 capacv:vk,lq(pm 4k6 (rau)j y2fbhitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of lyuarf2:) jm4p kh(b6(vk,vq 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 5000 Hz for a t) - /jbhb,mlt:ve oyqej39vva8/ q0uvotal , v)voqhu vaylb9jt:j-/qeb0 me 8v/3impedance 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 1xsa5ch4,bqyc imn 23d v( q2+e00-kW resistor at 1.0-MHz for a total impedance of 13 4d,+e2sx5bqcm qvin2(hc ya50 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 capacitor3j ty(mqk/ xicl wp,/6y *yhpurn12q.. What is the impedance at 1000 (6,xh ynq 2wp.j kc*3 rylp miyq//tu1Hz?

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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 caw,w otbn1-u.meqj 2dgt 2,yf7 pacitor at 1.0 kHz for a total impedance ontfu .b 7dy2gm 1owwjt-,2q,ef 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 1st 6. (bkl+ud8uq6u ucl8xw+f0-mF capacitor at 1.0 kHz for a phase angle of 86sbktf8c +uu u.wld6(+qxlu $40^{\circ}$?

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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 339:s:wu4ig;fyl-t 2ftajevr0-W resistor at 1.0 kHz for a total impedance of rei4ag t:uj;s2 y: wvt-f 9f3l45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a f8eo5 0e+ ezqyg6h )ecj8.ixo100-mF capacitor at 120 Hz. What is the phase ee8)e.h og+0e qxofyci 6z58jangle?

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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, 2h r rqou7q0r6l3aj7mr2 7t kj60-mH coil, and 1.0-mF capacitor are connht l 76 raj3r2qq6om707ku rjrected 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 capacitor, 2vxhh5u o(n9yzb+ :x gand a 0.350-H inductor. Thhb(x 9:2zvo+nx5uyghe circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W- x /zv*mwar16bh+wow , and an inductor of indh+*w16rw zmov/ b-awx uctive reactance 30 W are 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 zyqdh9v47c :g;czvm2 f5n0lxseries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H induct q:cxfc2h;zn5ly0 4gmzv 79vd or, 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 series with a 50 3 g64mebyc: pe +jdl):ogkc-f0-W resistor for a phase angle oef):e - l6kp4jm3y+coggdbc: f $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L m*xeh0ybtgy4e 2n:/q= 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have ma qmbte:2x0e hyyng/4*ximum 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 resistance, 1+i 7gvv2vv:h ob+u(tq 5.0 W inductive reactance, and 10.0 Wviv++ bvtu2 ho7( qvg: 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 cirp d7r-g0y23akow4d l-s vabf9cuit 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 ofei8r* /hemir * 60 W and a resistance of 30 W. What is t*iei h*8r/ mrehe 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 rdq9 ohv)3 1c/ke p8pytesistor, a 10-8ykt cq depp)3hv/o91mF capacitor, 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 c82tqgqpbq * alc6vjfw 2)*1 yuoil in series? )*lpj2t qgw1q*a 8cv2 y6ufbq

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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 witfjrly o9mv1e cu( e87 7bx;vef:xl(z .h a 4.7-mF capacitor for a resonant frequency cx(v7 9ve 1f: o;(bjf8uzr7my l eel.xof 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 neede 6)my roc7o;:3 vbckap9+k4a07 g+wolvjyll zd in series with a 3.7-mH inductor for a resonant frequency of 1)vpoga+cm o:6vw;0zl3k9yrcoj4ab+l7 k 7 y l000 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 30-W resistor and rjbzw3 6gr8e;a 40-mH coil if the resonant frequenc6 zbrjrw;ge3 8y of the circuit is to be 1000 Hz?

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