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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 un /: o v/50pyour*psfhg,pr 1ell,f b,bits 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 states thatfz/ v/s+j :(ld cld5ie 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 4)pvni4h)qqw9/lq i son the induceivnpq4ql s)4)/wqh9i d $emf$, 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 w p41icw.yk o)tj utgpsgh/+:w:rm gl (0.:aqxhat kind of r 1i:wt/.(l 0hxu)pkw+g :gqcgp4 osj.ayt:m 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 producesaw2+rlft9wx + what kind of change on the indu+t2wfaxw 9l+rced $emf$, 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 f o5q3:ze(eck ch/l 9zdield 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 d ss+9knn jc j6r95kuq:ltl s3d-89gtyirection of an induced current in a conductor will be that which tends to producs l+5:ntgl-3kudr99kcq 98jn6t s ysje which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies fla0abp6(ld8hjqo d .j /lt on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationabjq8d/ (o0lpjh. lad6ry 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 magnet i3aqu yw*y (k/ns held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (wh /*(wk3 qnauyyen 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 tog z,d(up oit8;djv/7 lp in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of thej o,g8dd; u it/lvz7p( 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 le 3 k:e6hud);qmsf(s envel table top in a region where the magnetic field vector points straight up. The magnetic field suddenmsnh3(sk q :fud;6ee)ly grows stronger. 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 horizontal table top in a region where the magf(um* q 5bboi3netic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced currenuqf*i 53m(obbt in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carrie fzny,f o3*yx6s an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed fromz y6* noy,3ffx 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 the north pole enterr7 bj qo/ahc-yd1/,sping first. As the north pole enterj-hc 7,qy/1sd/o brp as 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 spe n sn9 8fp/2xls:09txc bppcn0ed about an axis whose direction can be varied. In a region where a uniform pt/9 :89lxxs0pc0bsnn fn 2pcmagnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about at7t24 mscm+qk n 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 of rot4qmtk 7m2t+csation 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.,v*xk -kynckoqc+/*q9iet 1 s
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that an nd* bh m8p5g 5s9fe8kn$emf$ 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 magofz8u1 vfdwgq- 9 .ir;netic 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 + -eylix(h4 uicgq0g/ direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rode iq( g0x+i4ygc/l- uh.

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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 anguh q/lm2gl6l,elar 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 transf6mkecv e *9vnu.-k7hj orms

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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 freqhx1u()ud rerfv:: d) ouency of th:1) vr:d)o dhfux( reue $emf$ 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 cy d:o-ezv5f u1/ba1qused 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 d,nrdd( *wg0f eevice 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 ;yjwn1 9ub6o cmc9xa bf5*jzex9 ri ;6more loops than the primary coil c 99wz;;5jurbc 9xbfe *oa1m6x 6nj yithen it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops p8 (yxjk6pa:xjt -ynuh5,k gbeghhf m(6;3 3qthan the secondary coil then gf pj3hb5 nhqutx6-m8 63gype j(ahyk;x:k , (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 i1zj 62j2rjng lztp3.vnput

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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 resona mh9 w4h)dzr/(m4g mbfnt 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 t7v,)zvkc8 wx g-zrzk8 o an ideal battery of constant terminal voltage. At tzzr x8 k7)vwz-c 8kv,ghe 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 inductor are connected in serie eu0d2ca, 7/tu m:hb,sq bo*mbs to an ideal battery of constant terminal voltage. At the moment contact is madodb*au0,be7b, s mm:q2uh/ct e 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 h v o4yl-hp-(kR 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 connecte y5vfp4o(q.kxd qy(o- l*4rrcd 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 t gg92hh s:2jl7vy(sla ime constant forj9:vhglsh (g a22y7ls the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The battery 6 0sw5ww;ndpttr4p:vol ec c)/ -ywv+is suddenly removed from the circun:t-sy+d) c 6v wvw ewwopct;/05pl r4it. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the j, o58 ( dbxdkfjuxx(5same 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 this circuit, the curren; zrujajp3fd:jj lg(--6tu7f t

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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 a765 gu8oo;thmv nbgm73*bk psn AC power supply. In this circuit, the currenp bgb77mo mu;tv3g6k5noh s*8t

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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 chab+.lxzhb;iqvthw zb- c 6,6.rnges by what factor when the frequency is hx6+ lhb6r.wb-i;.zb ,zt q vctripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the e/g lrd1;ehd* inductive reactance of that ind/ 1lheedrg ;*ductor

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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 inductor approaches zem6+m,xkn o l*rro, the inductokmr6n,ml* x +ive reactance 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 mdn8gk;5)oq6 fel1jk power supply. In this circuit, the currentd8g1 5loqk fk)enj; 6m

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance 2b(b0l9b hsdkzgxc8 9in an ac circuit changes by what factor when the frequency is tri8 lg (b0bb z2sxh9k9dcpled?

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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 vol7l f0g+:flcy-+d x252bkz( eejnpagmtage across a capacitor approaches zero, the capacic+yl5aen0-kxge dl p fjm(+bf7 :2z2g tive reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capa96*n)hiid dmv*ugqm8 citor in a RLC qin9gh*8u vmi d6m*)d series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is dru8) sqq9 ll/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 e-2m 3m*pw )spav*qsu if R increases. When is this statement2uq)ep ssm-*wmv*pa3 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 circuio st0jkf( obm. .dnh2(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 seriej1w8 8ljvtxyx0 0 * xlh7p 0+ulssdzj.s 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 capacitance both double in an LRC series t: 15 vlch-o:vg 3i;-gkow;x*si nssu circuit, the resonant frequ:3 5*vi 1o-ug;-t;ws ikvxgoc:slhs nency 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 a j,zaszm0xyv)z s6 ,4gpplied 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 san t db3e:9,wRLC 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 uosv3v: z etbbrx+ t/7(niform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field v:vbt rzsxv bo7e3(t/ +ector 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 rotatin/ 5:yxt hkqpjj2shi,weti:9 .g in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are h,tj spy :qi2xt:/ je9w.5ki hperpendicular.

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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 rotah 4q0, 67jtucdouvrn0 ting in a uniform magnetic field of 0.20 T. Find the magneq c6h7urdv0tj0 on4u,tic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is redu mgf:z-8h.s 5-dgd laqx jc;9jced 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 frosotpgafo0 y6rs* b :k4; +p)axm $4.0 \times 10^{-5} \; Wb$ 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 wi24r 5c xr5vipdth 200 turns of wire on a square frame with sides 18 cm. A uniform magnetic2 pr4c ivdr5x5 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, 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 -sg73 uycp:iu4ito; qand 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 andi; 1* tqrg7hpgxtw1b- ,sn- qy 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 horiz/hc le3:u t m-7cwhgsw +6myu*ontally at a location where the :w/7sg h-c3 c+he t my*muwu6ldownward 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 thu )z 0.m)p1muvpk(vm96swjsv at is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fieldvs01zv 9 jm(pu)vm. psu6kwm) 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 ofy:g b.(5mq-pyzvt:1ta9 h h fa $0.25 \; m^{2}$. 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 ofbb56*7gde ozw7qtj2 n area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is 1 j4i)q*-re .kkyi5 shv2 cm long and 8 cm wide. The armature rotates a * 4vyq. iji5-sh)rkket 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 9/mssx1t-boi 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 scb1n 53n92cusg isa-;9ive -rq-key to construct a simple AC generator with an output of 12 V maximum whe 5iaybvk -992gs-ni3 e;s-e u1nrccq sn rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generatwibbi cji)eax 6(6 .((a rf0,shs *kinor 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 resisp )jj8k z*x;wktance 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 oporfqb 4-k lu jd4g+m*r+au: dkh mpz (lp0556f 6.00 W. The motor operates on 120 V AC, and when runni4+mh p bgzk -f 6ouu*+dlr54l(pajk0mdp:5 qrng 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 Wv og1 q2t6zga+ is connected to a 24-V power supply. The operat oq1+2 zat6gvging current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 2he 9i hcexbwk* a6sa2g0rxsrh-; / *2p4-V power supply. The operating current is 1.sx-b6h 9 e hra *gri22epah 0sw/k;*cx0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supppds xlg4u *l5vu j ,d0;pod0q:ly. The opgpqu ;dlsp 0,d*o5 jl4vux0d: erating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary volta:z9bz 6l, 4otbp1cdzgge of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in t 4nxnsrlf0xk5 (s ;bp3he secondary. How manyk4n p 3bl 0;xsn(xf5rs 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 are necessary in a 110-V primary if the 2w .o xs0(vij.syu nc.)4-V seconda (vcjs..nux )wsi0.yory 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 primidh uyi bklxo0u78/4 (ary coil and a 2000-turn secondary coil. If the/ 4dk7(xhl8yiub ui0o current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% effiklz3 3o3 sndyj2; k*xociency, how many amps at 24 V can flow in the seco3j2kd n*oy; lkzx o33sndary?

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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 sig8kgit en( t:e8n transformer provides 7500 V at 10.0 mA. The primary coil operi ent8gt(ek 8:ates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its seco*/hfs yz e55wj06l d1omctrd4ndary coil. If 120 V ato ld*4ms1jr5fywc5/0d zte6 h 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its p2:w-+ael9 zgowok (t hrimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primarwzkeh(wgl+ o:aot 2-9y, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary haslinf4w) (* 2zl kynhusqp(vuj-r19 e , 200 turns. If the input current at the primary is 100 A, we can expect the output currentf z)(qyvpnu,uj h2r e 91i4ls(l-nkw* 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 secondary has 200 turns. ,*uqk7fdd.i +epk a6 iIf the input voltage to dud6fkik.ai p+e *7q, 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 transfodd/mkq;ew )*hrmer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the powwe/*dd;m)qh ker 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 voltagz+ .6 nz,2sac 1yjr2utb2xho ie is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the numxo hyus2+rb. 21ci j, azz62tnber of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepv *mkjlzw 6/5qped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percent5*lmkz6jv qw/ age 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 o7i dr77wh1 s;*dwhsbat 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is nohr7swd ;ob hwd77s1* it 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 resis0bs +4i*+8spbmnmwzd tance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmmid bbw *0spn +zs48m+ission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total.p3v e2q8nlos 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 origlovnes p .382qinal 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. Howm6 0 w f 5.ynwo7uxv)cqmh d3padk21w, much less power would be lost vqdxw,wcfuay3wnp6h5k .0 d2 m71o) m if 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 V at 20 A. It is to be transmiku21 ,i5m gwoml nnj7*tted 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 transmission is not to exceed 0.010% of the original pok7,*n1 oiu2jmgn wl5mwer?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in the coilni z-h oz54jq. 5yh-g;gq-qlc's-5z5hgj4z.onq- yh q ;gl-ciq magnetic 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 an 18-H inductor. Wh0 rg6vmjbx4bfg4kp8) cby 01s27z gwtat is this circuit's tvzbw7104c0m6 k bprfxgj g28b )s4tygime constant?

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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 qgc+ij ,n*b2qf lb*(wwhere 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 11j: 0uj -anb alchw,8ykf1 tyAC 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 a 120-V AC outlet. What isoo/hpu*qk p -+/xh 9fn the resistance of the lamp?hop9*xoq u/np- fkh/+

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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 j(i:)mi qnmc8120-V ac power supply. What is the peak current through the re)nm qmci :(8jisistor?

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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 sc9u*qzcj w. .ll1s b3eupply. What is the power dissipated in the zqc *.bj93.c 1 lelwsuresistor?

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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 :2rukciu/ k :9yyi:jp 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- : fq6hm3.c50zaxzdsyg5qfj7W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resisx (o.yyoclou) mhwha1q -u ga-: e+m)9tor 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 reactancl+ n4axst ,0-u0i ivece of 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 rea8vlbwk.ew jr);3,u +7 w kmxtfctance 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 14jun/a8ksd( )-zv y2xc8 x-rvn.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 ofgzj 1qa8 76x. dv9xwfg 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 ij; *b7s t-isidnductor when 120 V AC at a frequency of 20 kHz is applt;jd7si i-*b sied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0; n +n hx48q +yvf+cuewgmlb9. 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 z2a o0vo+h 2vlat 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 capac3ilz)ztw 9nf v yvr/*.itive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance + ,/v- gz/wh txjts bl+.ovc6./zsyy jof 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 capacitorul 4z +e g*t3pr46gpu;d8zlkf be 100 Wplz8+3 r eu6fk *d;ggplzu4 4t?

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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 a6c*.zz 9sd opp.rqiv1 t 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 acp3b*2u1 n zhgg series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 101u* n hb23zpgg.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 ku 5p.fzpu ) :;nzbkx-h fpiy2 /h+yf31500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capak;+kf /.2xb-pu)p zzhfpy5h3 un fi:ycitor 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 at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0- d y0;jfkenfz);v ah(-mF capacitor a-ej 0fa) ;k(fv ;nzdyhre connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is . 9ewugi.x5zbconnected in series with a 20-mH inductor, what is the impedance at 100 wx..5g 9uezbi0 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 ser.pk,aqid( v:u ies with a 20-mH inductor, what is the piaudk v.qp: ,(hase 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 ;.k ks nj6k-qgwith a 20-mH coil and 1.0-mF capacitor for as- 6g;kkjnq k. 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 series with a1a 45rul+z5xskxa 8te 100-W resistor and 15-mH coil to get a total impedance l8au tsrx5 zake+ 1x45of 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 wit q hz8l;rwzjaagg74g b2+e+6ph a 450-mH inductor at 5000 Hz for a total impedance of 40000gagq hpab rjgzz +48l+e62w 7; 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 atan0)keo;/asuyizv2lje so.-. .; w x 9d jak-q 1.0-MHz for a total is).xoo ad -a i 9;k02esan.-lyqev/;j kz j.wumpedance 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 conq4ul u rd6xk0wl:x i;9nected in series with a 20-mF capacitor. What is the impedance at:dx; 9 x0l 4uuirw6klq 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 as/0ed :gpmqmn fx 0 u68wu-or) 10-mF capacitor at 1.0 kHz for a total p68 /engux -:u mfmq s0d)0orwimpedance 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 c( ocu3 f(xlp+bapacitor at 1.0 kHz for a phase angl+b( lf(oxpc3u e 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 id ,97 l0u dh;ljcqd21u*mb cdmn series with a 30-W resistor at 1.0 kHz for a total impjluu0 h d 9dc 1d*2mqbmcdl;7,edance 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 ggsyzkoo95wazy- o a1f21 4h/120 Hz. What is the phase angl4oa9 hzy2as/gowgy1zf 5o k -1e?

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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 H /:g4s/3 ktkl )/ idsubeswyv7z if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected ig7)sdvw4te/slsuyb: 3/ik /k n 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*:j3 3osrh3 c+zibocs o/ykv7 -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 the rms current in the circuit3zs3/yo+i:rjck v 7obs ch o*3?

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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 klxbcji,.6) i capacitor of capacitive reactance 30 W, and an inductor of inductive rb i6ijx,l)k .ceactance 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 series qjww5s *9(g4f:yl7qiiuq yt5 RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connectejwqq ti4 5g7lyy(wi sf:59u q*d 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+ku.v td z4w;f0-W resistor for a phase angle of u4 k.v+fd zwt;$40^{\circ}$ 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-m(bp00 bmwltb:jh a+8fr. :h vjH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving source?wpbm 0h08:+j b vf(ahjb:rtl.

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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 r0 vhmd96 enee)l 8n-gW resistance, 15.0 W inductive reactance, a6nvheng8)-m e0 erl d9nd 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit isf pk jv;s7c1;l $63^{\circ}$. 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. What isw a1i50 ;rs+kvj7fc bs ;c7j10 afi rv5wk bss+the 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 8zv;y n.5cr bl/r/inm50-W resistor, a 10-mF capacitor, andrib/r /zn l8nc;.5myv 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 frequennm x t*o;ah ,t:bxb+6ecy of a 1.0-mF capacitor and a 15-mH coil in series?mbo+;x x6a ttn:h,b*e

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF ca e,56nq4 q)8luhrespe pacitor for a resonant frequehe4ue s 8q6,en)q5r lpncy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed xd33z)- sb pxuin series with a 3.7-mH inductor for a resonant frequency of 1000 Hz?3 )sp3xdu-xzb

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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 a 45xr;.n-p 5i/nvs h4y2kd emc zzmya:+ 0-mH coil if the resonant frequzd nry5n2h pekmxc/v- yma4;i.z5:s +ency of the circuit is to be 1000 Hz?

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