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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 80 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；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。本试卷的直接作答链接 https://51fly.win/test80.html
 作者: physics    总分: 142分  得分: _____________

答题人: 匿名未登录  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 fluxc f.g r 9ypi(g.0.emcw0nh wz: 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 statel()( sw(q:j 3bjemz pys 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 ,atajevu4znedt66 )dig(ag3,+xm y 6in a coil produces what kind of change on the ind4d +muzx,va3j,66tn(yge egiat d6a )uced $emf$, 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 prod430lhi(dig3d. 7 s rgyq 9vbtruces what kind of chat733ghv0d(l.ig s 9q bydrri4nge 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 l eb5nd-ji jg0x;4y5n;myu .omoop of wire produces what kind of change on the induc;xm - ;o0en5jbu5 gi ndmyy4.jed $emf$, 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 /9:bw ,aakq0 y vaz7 ;tl+vzfgfield an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a coxl ihd06 7;yobq *7upuhk*hjvbg3f,3nductor will be that which tends to produce which of the following effeclifuupg 7b *j ;d3qy,bvo3hkhh6*70xts?

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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 hosb 1h8t2cb.cv/oy )nhrizontal table. A bar magnet is held above its center with its north pole pointing down. shyn2/bo)h.cb8 tcv1The 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 horizont6w12qasjj */bw/i.yh)a-msu dy8 aqx al table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed fxaas h16w m*8/ -2iqaybj/q syw.)jdurom 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 whu3,w py;.+ gr2 ntiwtnere the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of th,y 2;. in+wtgp 3nturwe 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 region where the magnetic field vectozo eg0cwg1 favhl(*+wubq4 -/r points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced cuwf gag- zl/ h(+4u 1qw0bvcoe*rrent 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 o) g+ a(oely ,n6q,vftregion where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this a)fl y6o te ,,qnv(+gocoil 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 9xj+zeoy vtjfm7y5+n p.m 66aan ever-increasing current northward. Two coils of wire lie flat ony9 ajymv +m+o t76fenz5x6p. j the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with t s 8q*)v*l5uakqs1xv rhe north pole entering first. Arq s81 v k5s*v*lqx)uas the north pole 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 rotated at constant angular speed about an axis whosekbdebu60b e.jzu)fgde ruf ys, ,1297 direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axykeeb06 eg ,ju9z ).2rsd uu1fb7dbf,is 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 consxe,yn u4 7ng4;nddit 4tant angular speed about an axis whose direction can be varied. In t 44n u,x4nyid;g 7dnea 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 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. i(xh4pz1yj3 e
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that hvrr9rxh., :c an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic fieldvxh .2yr x89golzp l+7. 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 iqs9gwwj;l.3 un the east-west direction) is moved northward at constant velocity through a magnetic field that points s; lgj9.wuws3 qtraight 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 r)am7iebx x(u 6li0 zt:otates 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 generato43h vjxi1a8u9 cn q60t. yhonzr transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frequevvv 0a6 9wgs5mv(oa( ka51e wz8f)z ibncy of thwwb ()1zzvm vk ao(i5g6efv9a0v8 as5e $emf$ 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 usedm24:g 9 eil7cub:2vhui 4b,ofy1 svz u 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 dex y +b772vmifyvice 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 co; 3r(w-bixektq 2qu8, ,lafoz il contains more loops than the primary coil then it;b ofl( uaz,2xew,-8iqkq3tr is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains morw cdr4,fozx beh7-, :)a* /zt /pc)pv,poaxage loops than the secondary coilz4 ho c*,dzp ,:r)-fog/c /a,v)ppa xwbea7 tx then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, thd wkddy,3m 12 q;.aq zfvkvxt,,p7aa9e power 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 9 dd : s2omjqtfvs-:y,circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battercw+ +k lp;kx4hy of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistoplw+hkx4c; + kr 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 bataavu dkr j6; y1)(p7urtery of constant terminal voltage. At the moment contact is made with the battery, tj)(1ak d rru va7;6yuphe 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 andceob (dnp-2h1 resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connectgk9yqt *wui;w pfu7h i( .:-0vg,4sccc aw8kded 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 inducmfb qrpr,/ n:2tor are connected in series to a battery. The time constant for the circuit represents the time ,2prbf q:/m rnrequired 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 ad xvsl(qsp ikusfk/,xq//2 ,j9- +paire connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of tkq,sj(da+ u psiv//2i,lks -xq pxf /9he circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following haveu)6g :bpks -rj0 qqtrkw*hm4c84vr e6 the 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. On h:cxy0ti(:n ..tpif ;fg: kuwthis 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. Inxp p-arss3*5 eyhv,1f this circuit, the curren* rxpa-5 vphf,sye1 3st

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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 when d3,*rwpyfgj7 7f: )h qph a. m8;lapzlthe frequencw,8:h y mp3pzpf.7a) jf7glhrq;dl*ay is tripled?

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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 thx56/6l x4dgvf8 b ocl4w xk*sze AC voltage across an inductor is doubled, the inductive reactancx*xdg 8wc/sko 64fl4v6bzxl 5e of that 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 v pd jq;z* 9m/w+fcjxpr9-(s fnoltage across an inductor approaches zero, the inductive reactance of thj+ p -( nx;*/9qmcjwfdrzs p9fat 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. Iny 1qf5ky. 0n r(sfhd/ rt1kd4e og3t5h this circuit, the curren013yogt r d5q1h5.ey ftfhkd(n/krs 4t

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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 ch)ux 89amgg (jwanges by what factor when the frequenmgxuw8aj (9g)cy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approachmtu yki* 0a-:qp j0b2ys07d ohes zero, the capacitive reacta2*o0 a0:uym 0dqtj hsikby-p7nce 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 th)ik w j+6:ypblc 2i3q 6 n-gxwwyo;p0he voltages of the inductor and capacitor in a RLC seri c6wpwl)gn pkx+o0:2j- ;whi6i3 yq ybes 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 zx pt0 1t-gyy+ *golw,j09zmlcircuit 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 i( 2ks)qaz21vkijyc cj wb5o3d-2vy k,f R increases. When is thk jq 2iycvka15- ,()jy2b cov z2k3wdsis 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 of the circuit increases msuqp9zo8zl;g9 hy 8ml4l. (f 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 serio6s g k9w / yknpoy8-b8of6cm-es circuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitan(zr;gr43lklw w ph31 wce both double in an LRC series circuit, the resonant frequency of that4gh(wwlzl kp3 r;3rw1 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 applied voltalm9x3oxq/(oa j 9:div+f s, ggge. 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 *lf q 0ddyq.:vvt kc.izo3of3 70xc 5ccircuit 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 radk 2 /momyp:anwk4xaqj60d 7/ uius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when thenmdju2x q 0a/wom 7/kk:4a6yp 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 0.10jg- s:y 5-bktubw a:(i m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the tsw:ba:jiy b5u- (kg- 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 radiuq) uo,nuuo(tu/bh-p1s 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through thqou 1o(pt,uu -/u)bhn e 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 adj,jkvs .p 04/f+i hfwnxustable 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 changelc) /cv33nvdrs from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with 3ov ao wme*zjs*q2 ;)b2vruy:sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field chsaq:2 v2 )zj*eovymbrw*3ou; anges 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 15nzuq 5ren4/k( 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 and area *irby3hrl .h)8b ayf ($0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location whq;+nv: z9 m7flbyb iw.ere the downward component of the Earth's magneticzibqb m:f+ ;wyn9 .7vl 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 rott4jx31m ;u tamates at a constant angular velocity of 2.0 rad/s about a verticala1tu;4tj m3 xm 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-cyenvp4 5si6 $0.25 \; m^{2}$. 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 o5d b qd71dg,v4 seovx:f 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 rectanguiqi40l6qrl lf zd-6y2 lar loops on its armature. Each loop is 12 cm long and 8 cm wil2 il6dilfr- 64yqzq0de. 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 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 a17r h t5)dde 8a,(.zwelfpfzarea $0.090 \; m^{2}$ 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 generator with an o,r1.m2)z yoh/f 1(ijkesy lloutput of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotatingje rok)y 21lify,.h / z1ls(om 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 gezoe9g+t j7 85p;lcs4t +ymabknerator 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 have a resistance of 6.00 -2gu p(m b8l y(htob6 xyr*.glW. 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 open/e y ))hc3bu t-yy6perates on 120 V AC, and when running a)ech uy tn p-e)y/36ybt full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. l 0-(imr* ibzj The operating current is 1.0 A. What is thib m*iz(lrj0-e start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power sb v9c4 trfuy45upply. The operating current is 1.0 A at full speed. W5bfc yr ut4v94hat is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V powes.4qag7 vdaz td:q6r/yld urs 8-b/m+r supply. The operatingrz.l vq mtb7a-/:g4u6/qdydss r d+8a current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needeeq 2fkmj8 q*;hnj xp76d 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 x.*+oq3( entrfon4 coto flow in the secondary. How many turns are in the secondary?f+*q.oxnc(3 no ret4o

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primaryjqv:3l 1k7 soxr3 .):s wejizwz t.(df if the 24-V secondary has 100 turn d(f wj lqs:e .xkw:3i )zs7zrtv13o.js?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and (e9aly 6q:t7/ xvdy. 8j( kenjqlmlc/ a 2000-turn secondary coil. If the current in the seen9y q .jlcj xll(vem/7q(yd8/6:takcondary 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. Assuming 100% eb(dxqkk: f,m (fficiency, how many amps at 24 V can flow iqd,( k b:kx(mfn the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. Th)hvhb)0kv vakh r54y .e primary coil operates on 120 V. What does the primary draw? )hv) vhky5akr0b 4v.h

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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 coiliiy.ioye 7 xo)q4)tcb :;:n gq and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the s i ) ecnqo;4:q y).ibt7xgo:yiecondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 3qkr/fl -(* nvf00 turns on its secondary coil. If 120 V at 2.0 A i* /qf-fnrkv( ls applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns7)on 0d qfcdy+/4vjt f and its secondary has 200 turns. If the input cud /4+ t0njyqfv)ocfd7rrent at the primary is 100 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 :9 s**(k(fahbxugzdy its secondary has 200 turns. If the input voltage to the primarygku** h sy(9azd :(fxb 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 its second-es.k5x w* idrj zs1,fary has 200 turns. If the power input to the primary is 100 W, we can expect te1r5x z d.,sjfis*k-w he power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage)f)gqn 858wmxifrpn7 is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of tur ifm5wqn)xrnpf7 g8)8ns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepped u (kj2j790 o q vdo4sl:i)tqwvvp to 4500 V by a transformer and94 svtqvo: j 2o7(ik0w)lvjdq transmitted 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 isy*b ;jlo+y. kk h0i0yt mef5m: usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Findfymtk0l;5 b:m* +0.eyokjy hi 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 has apf dwb.j/ ()dj;kn m8u;hp sf- 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 d8h().fjb / wjps;fpmdn; -ku the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0q;afu.h * +;u1p5 y z0qfkovraef1 i9f.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. au* ; ; 0af.hizf+1vq1q y eo5ukf9frp 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 less power wouldy2ld0,u*d yqjazu y1nudx*:tk/ *.i p be lost if the power wer/ adj*2i0yyud:*tn,1 p.*zy q uxuldke 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 V at 20 A. It is to be transmitted onfy mc3 6q,j6kghdx.8h 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 transmission is not to exceed 0.010% oc 8j.d g6hqx,mfy3k 6hf 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 s;kh5*fuhh srib/ 5s1jtored in the coil's magnetj*s1ih5hs hb fukr5/; ic 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 q+- t cwcfy5c6an 18-H inductor. What is this circuit's time con5- t+ccwqfc6ystant?

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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 rms voltage is8 um*:pornxgm-8zep * 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 inr *dgguy 91qd,to a 120-V AC outlet. 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 ah vls9f;s: (nk2d.x 36jm hezc 120-V AC outlet. What is the resistance of the lamp?(h 2 3sv.9nj:elf cx6m;sdkhz

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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-Vx 06g.fhs.zzn1f t1vo ac power supply. What is the peak curre1fogsf1.vt zz.0h x n6nt through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a y ; e;s1xvny2h120-V ac power supply. What is the power dissipated in theh;s 1;yy x2env 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 resist5 rndj sgw 3ac(6exf73or 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 resistor w u1k a894 9t8b ymucj0k.rhnais $I = 0.80 \sin (240 t)$. 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 resisl:f6 rfy th3oh:w- w-ztor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of hwk7d8xze io. 9s3wm 2a 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 of a 2.50-ul scs,.vmnvm7m o5f xmw9yp* v,q.*, 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 14.0muqw,*v sh.j am *d-2l 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 mr9 yjzxi*+rj c8,3ktlyf* )v 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 i 8(1- lx) cikcuvwr;kxn a 60-mH inductor when 120 V AC at a frequency of 20 kHz is applieli xvkc; -1(ckrw8)xu d 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 throug+r1omo,0 c3g ycm*vtzh a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 kHz pye7 q2hf53add72 bg0 rztb1o?

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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 capacitive reactp0k o4 t):sr hbtxk0i+ance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 1200 W?fyhdnb84psbmc4n 1;6

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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 capacitivm-r 5)bfa a5 s ouddb 5g0,b,bi6-hrjye reactance of a 0.010-mF capacitor be 100 Wbbdr-miaj u- g b,5rbsdh6o) a505y,f?

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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 throu3uco0vqf4 rdv-c3xw9q y 9g n*gh a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.0 t7xpdum f,, i;kje: *xww7zd/W inductive reactancexw* : iz dw7mdp7/tufx;,j,ke, 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,p vot2d,olo.6 and 1.0-mF capacitor are connedo ,.v 2ltoop6cted 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 a8fkl 9a *jxr) gh0ti/p 100-W resistor, 20-mH coil, and 1.0-mF capacitor are cog0x/jai)fk8lpt9 r h*nnected 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 enap;,zjh-(htk:j7n 20-mH inductor, what is the impedance at 1000 Hztk n;p h (,7ae-zjh:nj?

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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 indu+ 1e w8 axyhm+0n*iewmctor, what is the pham *yni+m xe0+8a1 wewhse angle 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 needed in a series circuit with ,mjjzokdtcy9h(3 w8 h 6b3x9wa 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 15b6wh9wkd (3zo tjh y9m xc,83j00 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 1009)j +vj7ub7 hzlntg 1t-W resistor and 15-mH coil to get a total impedance of19lgbhz+ t )ut7nv 7jj 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 Hivo;ecau/1 j/z for a total impe1j;i oa//vu cedance 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;o)0 c5u clh2z vhq8ss a 100-kW resistor at 1.0-MHz for a total i hvc)25 h0 c;uzlssqo8mpedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF b-h)4;yfd:fv19pz yaygd 2wz th8 ki2capacitor. What is the impedance at 1000 Hz?fifh4vzzg d18)2at p9:d w k;2-yyyb h

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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 inl xjq-5+w, ee7acpi5k series with a 10-mF capacitor at 1.0 kHz for a total impedance i kqaj ,p7eewcl-+55xof 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 wv7ci ,zs6wtg3 ex81fyith a 10-mF capacitor at 1.0 kHz for a phase angle of1 w8gf3tzevxc sy ,i76 $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is nee0 4kpvftod5t 0 mif--fded in series with a 30-W resistor at 1.0 kHz for a total v4fik-t tmf-f005opd impedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at w yj0k nx1v(i2l1 igg;120 Hz. What is the phase ang(2n xwkvy 1gj1ig0i;lle?

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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 1.0wi:dev) 0 .fyi-mF capacitori.edi v:0fwy ) are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W rejqg x9f.*3cjcsistor, 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 th9cj3* x qcgf.je 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, syxbuv 5k05i( dq;g3nand an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. b(55g;k nu iqy3d0xs vWhat 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 RLz-c l.x2vii ;yC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductorc2 .y;izxvil- , 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 ar3 z fr;)bnruhizt t7. uy/nou267b 7m 500-W resistor for a phase angle ofir/z)7n b m.yu thnf; ouztr u7267b3r $40^{\circ}$ 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. h,mwjn/9j;ampdq,sq ,g , kf) At what frequency should the circuit be driven in order to have mh s,jpnk w fd/,,amqmjq;, )g9aximum 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, sfhtf*o ,zj2gds4t ;r7z qf )115.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connect1qfg fz*thz,s2; dfo rtj4)7sed 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 ci3 z: 9cuwp89:ytes yajrcuit 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 resistance of 30 W. Wha ,ih6icp)rmq; t is the power factor?mi,hp ) i;c6qr

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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 resistoy jm)d8/gv( ifx/jg +: i6cxilr, a 10 limfxd jxiiyvg:/ /j+) 6g8(c-mF 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 ygbt9e:c 7 ka 7lp3vp2yf;l/ra 15-mH coil in series? rp; g2:p737/yalbt 9ckyfv le

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4k5*- slpet1v dp3 wao 801kmjw.7-mF capacitor for a resonant frequency ofat108v p -*o13kw pkesd5jwml 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor fi0 djo5 ,al6uwor a resonant frequency of 100ujw,aoid05 l6 0 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 seriespf k72 pjwkxso.n-v1 kqzcgx442be( ) with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to 27sjkk.x b 1 e n)c4f2gqk(4vpp-oz wxbe 1000 Hz?

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