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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 magnet)ym4ilit0ifhs:n3 1mal )e. vic 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 inducqn:1;gdn (9fbkqi0 nqtion states 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 4oaq+cj egn4g w/y50i wire in a coil produces what kind of change on the inducedyaeq5 4j i/0cwn4go+g $emf$, 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 fie c.xk8 79 azs*ny/aulw+1bc q5qgpp 1old through a loop of wire produces what kind of changecpuyb c5 qknsp1/o8z gl qa7w+1xa9. * on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on ti036uumw:ce e3pl yp8he induced3 6c8p yw:upm0ei3l ue $emf$, 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 magne7tt+1vvhtg z cufhe 4 )hj;z03tic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the directceb ) q ,4:m4brjoq/cgion of an induced current in a conductor will be that which tends to produce whi) /bqgcbo:qmr ,4ec j4ch 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 magnet 1g 18rr3t2tyk.x 6vdf0emnpl is held above its ct6 81f mrvep.xnd yrg1l2t0k3enter with its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held ab9gqzn4 j 4ku3ams7.;1 giucvg/bv 7vbove its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when vik 7/ 4gv3sgiqub174m9uzcbgav. ;vj newed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magneticlo-:)qbsvxf-ihu 8-h c s4 qh9 cs06xv field vector points straight up. The magnetic fhqxs ih- bx46 :-vcuv-o9lchs80)f sqield 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 in a region where the magnetic field vecogm0h/w.4bp ob35l3ql( p ye wtor points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this cqpw myb/(p3o l0go.el5wh34boil 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 qf.gvec zstdcbv.cy3 1n,4wath; : 75 top in a region 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 coil df v cwgv3a1 cz5 :,q ct4.t7ysen.hb;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 a 5i;wwa 1g9emznd carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed fiag1w95zwm e;rom 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*sbjcy8 (d*6tqrgmy,crt 4 mdght41/ a loop of wire with the north pole entering first. As the north pole enters the wire, the induced currehydg,q6* 4tt(8rjd mr4cs1/bc gty*mnt 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 rotated87/ nbkyjdjm;ne,( 9zdtn t*d at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field po;tdbjn/(y9 t 7d8,zmen *njdkints 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 a)qjp p(bz4p+3q 2bysungular 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 axbq+u3 y qj)p2( 4zppsbis 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.5 v,jbtrb+:. t xo2l7xjtqx/l
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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 ( d2b pmfcc3f6that 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 fbp 82dr1r/rbo ield. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved ndcl/t+7**k0)wmced .. 6ha o /c nzlkoecwtt3orthward at constant velocity through a magnetic field that points straight down. Make a statemea t /+l con/)d 6zc**0mtowlc. kdckewe37.t hnt concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular veloh -z:*n jdldg7city $\omega$ 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 t3hrzr6oh3u -fz x7u+fransforms

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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 :o+ wmvpbri:8i(ug 9trevolutions each second. The frequency of the mtubp w+ i8g(ov:r 9i:$emf$ 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 dne l;bnoke/ p 1 xv01jez9/j;5,quki cevice used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device tl od6,5-xuvti hat

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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 secondar2 17f14mqtbnwnq q6 vjy coil contains more loops than the primary coil then it ib7w2mfnv1j 6 q4nq1q ts 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 p (uhi4l/9fmpthan the secondary coilmil(fpph /u94 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, the pow4lzbi/bet2f k k033:mgb(c ober 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 resonaef4 yh7itd;ukmrr 3ai 2dp174nt 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 battery of constm cv; lo0(p bv0e9tpzfp133dqant terminal voltage. At the moment contact is made with the battery, the voltage across thep3 (tovbcfz;1 p0lp e093qmdv 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 conntw d3*-oqvak+(q4x- nrz2 l huected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across -3qv 2n*4 wl a o-udz(hxk+rtqthe 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 / ls/ rbzpk)r-lkn+cnng 1(:qgxz2;h 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 wiefx64k30x rk0 9vd pzmth inductance L and 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 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 serielkg8bv . 5de4knq3 (gds to a battery. The time constant for the circuit represents the time requiredeld(435g bg.vk8d knq 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 ser ci6b0xi ot/w9orp x20ies to a battery. The battery is suddenly removed from the circuit. The time conc/oxr tp 960 0ioibxw2stant 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 same units e,sd e mn.z4oi(j:2h;cyoflpm9 4t f *uxcept:

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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 xwpj/;av, n1 qio*(kik8c*cqAC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, tu*vy)4i,md,ull4lrd 5vetn 6u7k k/ehe current4 76udllvt*i y/4el ndvk,ek ,u)r5um

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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 the frequenqb7lmx)c owtge;a , 0j7 d-gj2cy is tripg aj,07ewb2d-x)qt 7cjolm;g led?

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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+)ubp5 .6n;p u y.d)xjh mzbtq across an inductor is doubled, the inductive reactance of that inducto6ybj;du .b+ pzpt) x uhq5mn.)r

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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 zero, the 0y iq4p3 y3z plsat11ibrq*os/o91ci inductiri 39yzql ayp3i*c 41/b0tioqs11 psove 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 power supply. wiq iq,de.i:(efzf* l/l*b p: In this circuit, the currenll wie:fi q*f,:i/ e*b.(z qdpt

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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 changes bvgb+gttw -+ c3y what factor when the frequency is tr3tgbc-g++t v wipled?

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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 (t kdhb8m/ux u(a l ;ih*lv(,gdb35olacross a capacitor approaches zero, the capacitive reactance of that capacito *b8h 5;/ udt3ulgh amlxo,bk( ilvd((r

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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 capacitj;aai iw)e- i3y;nom:or in a RLC seria;winy) o;j:ii3m -ae es 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 0rbw279t(wvpted- rz 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 of the circuit ih 0p o 0dtv:e2;h zu6,c hhhj33tojk6increases if R increases. 3oj ehho 0cdt0:2p,h hukht 6vz36;ijWhen is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increase;f:a5 oefj pksc-25dcs 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 if mde .d6 vskof:6g,e d9$X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuit, the p jbej8t5//l uresonant frequency of that cil j/e/bu 5jp8trcuit 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 *4lb pf2.ky wvAC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circ+5a4m on7rmbnmy 9bi8 us0:8q wuz.q huit 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 m*jjp ic h8c *kinvuapeus;01.a;wt9 0agnetic field of 0.20 T. Fi;*t u 9whij0p cj ps0na.*;u1 i8vckaend the 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 rax : u9iho7:w + zlpuxlu1)0fdfdius 0.10 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 the magnetic field p :ouxf7f9u0+ ) uiwh1ldz:l xvector 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 rotat rnp2:ok6;;, wdm vl6viw5sn zing 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 vecionvw;v, dr6pnm:2 ;kws65 z ltor 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 singl:7;j bn) ahzvgu6 8ptme 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 coin2p w7m i3ng/il changes 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+gu)i0fagk/2.oam y k of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane ofgy/ k0.fa2i +ugomka ) 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 anb4d kg06oc,qbdqo1 6g d 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 area6 /((s pyr9j.x adtyxs $0.20 \; m^{2}$ 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 wherea)ja 1ceigl6yob mjs; 9/ji/5 the downward c1ajbe/ojcmi/ji ;6 9la s)y5g omponent 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 angular velocib 1;c uknnj3y4ty of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic n4cj1ky u;3bnfield 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 a*.5yi;ov anwcrea 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 consi qzht;2- rbme2sts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loo vk//g9b( w atgyqw/f:ps on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the9:yt// wkwaf( qbv/g g 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 consis8bs-.3l gika c8.du znts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC /v+ezcjl8wg;.45lrb nhwl/y generator with an output of 12 V maximum when rotated at 60 Hz.r5w8z.4hly lnw/ g vc;+lbej/ 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 generator with a ma rp2j,g k/.d/cf*ayb/vka r5aximum $emf$ 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 6q l l./f;z-iin.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 resistan+xy):y*qvnuf ce of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a +qu v:ny*y) xfback $emf$ 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.kga-il1fu/p. r a em*:0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the i/leg- :ua.1f* kmrpastart-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 resistanqt /slnfnvw+ (z2w- c/ce 6.0 W is connected to a 24-V power supply. The operating current is l+sv/n cn2(tqww /z-f1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V po f0gum5bzb:wg x24b0 7e djr:cwer supply. The operating current is 1.0 A at full speed. Wha ec: 7g4mbbdz52 :rj0wbgu0fxt 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 nee.davvj6nbtpt)- y *c1ded 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 doqrocf vt3ny17ss66c 86 7eb causes 14 A to flow in the secondary. How many turns are in the secondarrve c1 s6y6noq73ts68dfbc 7oy?

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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 ayq yzf fj2/)s5 g/dze ;rjh;2d 110-V primary if the 24-V secondary has 100 tury 25 gd/jyfzshf;;e)dqj z/2 rns?

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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 a 2000-tur - gy(h8is+upfw )m9 yzyj v*zq4ex92i83dnf qn secondary coil. If the current in the secondary is 3.0 A, what isziy3nzyq ep2dgf-x4 jw qf+m y8v9)(*98hsui 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. A0 q6h*)6q+nqgn4n 7 avwxsucr)nk (tfssuming 100% efficiency, how many amps at 24 V can flow in)c+qqu6 4*q n 6(vhnrgn )wa7tf s0kxn 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. T4wniy lqu 0z-9he primary coil operates on 120 Vu0q4ylz wi -n9. 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 coirr2grox:b25g 5rr6j cl and 300 turns on its secondary coil. If6xrrggr5:jr r252bo c 120 V at 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 hajyhdbj +f..xs,(d5x jcij2p7 s 60 turns on 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 tj2c,djy. +jfj7.s(xpxhi d5bhe 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 secr aa6re )oxp gw4b,-h9up irog2*5e3o ondary has 200 turns. If the input current at the primary is 100 Aei ,xar wru569 2o3 ag*gp4o)-ebor hp, 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 transformergxu0*k gsk8/n. 5d 91fojc jzy has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary tc ng*yf5g9kz8 .ujj d/sx0ok1o 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 turn4 s fj+-u7v /9xbde ruolgblzb 7gv;04s and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (n0bu4ld;xvso9gr b/ uv jbgl4ze-77f+eglecting 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 f*r fz 3+k,pm7v a4sr0gle* rvvoltage 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 3 rfzg4*ae0smp *vr 7+,flvkrns 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. Th;offa96x q9b5hyto (re 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 p996 ( o5f ofhryxta;bqower 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 steppy.60hha5 zw4mq vq ,dyr , ies5whrk07ed up to 4500 V by a transforqahy40w,mz e550. s ri7kqwv yd,6 hhrmer 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 not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resij 7g4r+,dk/sqc ff-bustance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating ob+ u d- ,7rgqkfsc4f/jf the transmission 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 resistance of 0.60/ 1:ywq e3n;isvz.g;3tlpdqz(x gn- m 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 t g /qsxwvp- ( ;di.;nm3qz1nleg:yz3transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1b1c+z d5vzx+u/ hz.ch000 V. How much less power would be lohx5zc +c. vh dbzu1z+/st 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 Vzvd n06 6vr8e0fl: lsj at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generatosl ez :dfrv8 nv0jl066r output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored cgo+i; ..b gra 0nq:thin the coil's magnetic fie .q+gbir ;nat.0ghc:o ld?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit con ly) / kpjvm5tj4t*dsi .drj6*tains a 6.0-W resistor and an 18-H inductor. What is this circuit's time constan4 6 kjt.ltijds * ydp5m/)*rjvt?

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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 zts9*e/hegoit i6 9r019 pc iathe 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 outlet. What is the peak cuzfyxznwl49,vy7, fw6 rrent?

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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 is the resistan0 0x+flpzhr reeo,w:g*8a u+ tce of the lam0tof++ *0exz ruraw8ep, gh :lp?

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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 power supply. What is the peak curr.. xe2,san :a)zmzz duent through the rez) .a.z:x ensmad, u2zsistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the power dii 7mrlqtru)d, k:o4;j+ici (pu i;7oo ssipated(mk o7oi:qiuj; o p;,) itur li+4cd7r in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 5ueqs+d 5ye 13d0-W resistor 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 rea * j(w8z dn*f93n5cqm xhpwn:sistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor +; a1 :dazbs.jjv bao9is $I = 0.80 \sin (240 t)$. 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 ofq4x)i56; lxusqy0ausw d9sd0 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 9 6x .tyqouq9d4 gx2obreactance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive r;j 2 2pdvdw2d)cm , rk5pekoa2eactance?

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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 1000 Hz a03ho 2yjwwdcaj3 /.d?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC caxfmv9 r s,g9i2vm.2at a frequency of 20 kHz is applie9igarvm9v c,.2x 2sm fd 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 coi 1sszlc .+yi3jl 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 /, j- cpn-uary10 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 ton-gv/d n72f l*uknq d) have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-x4eyb htue+4oz;(m669okw a vmF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the c32hapv j)n ujdcoxo 7sr 4a:j +-mx0.uapacitive reactance of a 0.010-mF capacitor be 100 W?2vpoud+a)0- 4h7nu xx 3j:.arm jocsj

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz anxh,e teh *b(hh25g c;wd 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 circif-bn ; 0go l 0o4pu,o.rhn xok+(jqr*uit with 12.0 W resistance, 15.0 W inductive reactance, and 10.04hlb0;-o or, np+xo.*0(urjni qfg ko 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 res* 1 10*ff ph2vqm p6rs9 .rvfomehnd8uistor, 20-mH coil, and 1.0-mF capa6p 98nh1f mp.q2 rv1 oer*hv0dmfu s*fcitor 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, q+rzab -h */u5n8xzfi20-mH coil, and 1.0-mF capacitor are conri+z uf5n- ax*bh8/q znected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, wha1w3 hasdbo kbxrnl4, /;k j7.ut is the impedance at 1000 x3/br wsk1 dnb4 ,j.kh7alo;uHz?

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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 inductoy9e -7m dx.w:kikc, x1;lu j2zxy3m alr, what is the phase ac1y-3ukd;l j7wei, my:l2.x mk 9zax xngle 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 )fp gg*dlx+a8 with a 20-mH coil and 1.0-mF capacitol gdg )f8xa*+pr for a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resis1ll))44(bm ju mfszsk tor and 15-mH coil to get a total impedance of 110 W at 2000)lzj4mm (klfssb14 u ) 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 (7w*4z8fgzc hspnn.qf.g 6 sv at 5000 Hz for a total impedance of 40000 Wz4f .gnv8h6 (.zqsgc pfs* 7nw?

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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 in5kd .,shzy z.w* nhn1w series with a 100-kW resistor at 1.0-MHz for a total impedanwdkwz,. yzn5s 1hn .*hce 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 aw x8z2qc77,y s krs6gd(seo d* 20-mF capacitor. What is the impedanc(7s dr78*6s , 2kdeoqcwyxg sze at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1--,evljz:k g n.0 kHz for a total-,n- jgzlkv :e impedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in ser;*j 4r3f,xc rthjw:zw (yjk3uies with a 10-mF capacitor at 1.0 kHz for a phase ar* w3u;fy,3xrw jck4 jjz t:(hngle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W res19o u;y8qmjgr pi;sr 4q5 hsc*istor at 1.0 kHz for a total imghys rsq;14mr;j5c*89o iu p qpedance 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 serv.ss+ w1ehyk,)9lgy l 0b kbc8ies with a 100-mF capacitor at 120 Hz. What is the phase angle+ sl90.s8yhblkg cwe1v) ykb,?

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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 im 13nfkl;xggpqu b.88ps 4b x3f a 100-W resistor, 20-mH coil, and 1.0-mF capacitor arepk8m3f4b3x;blsp8x gn .1u qg 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 resistor, a 10.0-mF capacitor, and a + b3qyiul3/.4jxk 7qjqnvu 1v0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current inqy n 47q+kq 3v3j1vljiu.x /ub 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 reactancec.z -ic*9 uyp 2fs*olb 30 W, and an inductor of inductive reactance 30 W are connected inubpc9-zo2*sly*.i f c series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuiv(y1w7lui pb l.b( 5hqt containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz h(5qyu1.lbw ( bv7lpipower 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 500-W resistor for a phase angle ,a 4qleuajto7 s1f-b/z( 3agkoft37fgb(-/sa kl4 aoaj q1z ue, $40^{\circ}$ 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 = 2/r.bilcy g),wgaa-9pqi - 8wbt8rwq+0.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the .qy,g8g-t+r-iarq 9 l)i a 8bp w/wcwbcircuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an xca:a9vi3* lg ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0x 3aclav i*9:g 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 ant721s hrmzl+ p AC circuit 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. n lips8ao9*7ljsy9+d What is the power f9ji7yspll 8aso*9d +nactor?

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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 RL0jf,pubbqi)s -j./x yC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H ii-xujbp .,b0)yqf/j snductor, 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 coil in seriesr2+ eu,pg ):qwpy+kb/ i+ yloc?+ywqc +gyue/,:2p +p kbo )ilr

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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-m )/s nb0uk. c(bkdl7sj0d.titF capacitor for a resonant frequency ofct)s(. 7b bj ld 00uknt.i/kds 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 for a re8 )al-o:zjuc)./dqnsa 7xa qc)3qbf psonant frequenc3.)s:b ajx c)pzda8-ao q/qu)nqcf l7y of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in serie teoe ()np) 9tzeuhs5r* ok:cp f08sz*s with a 30-W resistor and a 40-mH coil ifs 5r*k h )*z8(:os 0)np9efzeetocupt the resonant frequency of the circuit is to be 1000 Hz?

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