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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://autoconfig.51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 80，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://autoconfig.51fly.win/test80.html  教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。
 作者: physics    总分: 142分  得分: _____________

答题人: 游客未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units oaexad8xo s-hi*8s5b,jt .qc)f 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 state/b0pvwdbon0jb/1 b -y2vo*n t s that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of c*7)/b6 4atqf 3r/eoum2wyf jicngr7qhange on the indrgnw fqec6j/ 72o3arqfmi b) *7 u/t4yuced $emf$, 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 prodm. lfikjna8 ;ao 4h1 d8nu))qwuces what kind of change on the induca do)wufij 4l8k.1hq;)a8 m nned $emf$, 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 hjty9n5nt3jz x uildry* 6 ;)0kind of change on the indui3x*jy)5y 9hlnztu60nj rt;dced $emf$, 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 f jxm xlp(scyl)3+uy r.i n1+lk-)q s:a7svk6a magnetic 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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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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 condui,khfs 9a7 -pbwj8*l/wa-s wtctor will be bajt swl,p w ias7-wf*k9/- h8that which tends to produce 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 flat on a horizontal table. A bar magnet is he)5 zcvv.wog78o hz volb63 ;sb u9h)ynld above its center with its north pole pointing down. The stationary magnet induces (when v95cb87v)bsl 3 ;ow n oz6vgzyo uh).hviewed 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 above 91wc4f*pwtl5(kbxda its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces 4d9aw k1t*l5(cpbwx f (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a r kwzyc5q pjez;-woe,.j h2 qey2an.+)egion where the magnetic field vector points straighj 2ypywnz.5q.a),wh co+2 zek qj;e-et up. The magnetic field 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 3 l/qgltm-g, ywb- m)xa region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increase bm3w ql-lyt-g,g/) mxs?

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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 :g.b x/kou4 5 9i qxyf x9kglct:2,pnathe 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 as the field d, 4:xta9g qg: lp. bcy/92uxxfo5nikkisappears?

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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 liet lgm:1;f6v(9c2fgyzb*n dyq s on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wir2gdqm 6z1yvy : *(fb 9;lcnftge. 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 w)m1t1m +ff) umim/;4emp g,iemb hn, wire with the north pole entering first. As the north pole enters the wire, the induced currn p;,ti 1fmh4gu1 e)mm,m )/ wifmbme+ent 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 d 1sj -rv fkshv,w(z.8 lfkd(2angular speed about an axis whose direction can be varied. In a region where fs d(w,f.kv s1k hrzjv8-ld2(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 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 con:j-w ; .jihe,f pzf4lcstant angular speed about an axis whose direction can be vafhf .,p iw4;jjcel :-zried. In a 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(wq: h* w h)pnrdx*7x
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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 9 cp+pq davod0+8dm2ythat 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 fi p9h,v q tc4p ,j/;t:0hu7+hww exnyfield. 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 th9b; geu-paf jqv(sa*5 -rzr/se east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induce5(a r *bjfa usz/;gr-sepq9-vd 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 rfr(.t)4qa5)zp e irq rotates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator tlb, vie*gm2bv-x4q 9w(bq ikr 7sj7.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 frequenc g 8-ivf;tha(jy of tjaf(g 8vi ;-thhe $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used 6pqpph4(y;c;/ zg ci dto

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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 tha ;l2h2vnzqi/nwv( -,o zc*htf s3q0nn t

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loo1ov) 9 sc;y6 3b;oril ewpx*kvps than the primary coil ;3s16or*x 9we) ;p voklicyv bthen 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 than the secondaev: d5n - ipxl/svb)g,ry coil thevv nd :/5,b-se)xlg ipn 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 p rn oxzs4 3/ +4)l)pf.0fqazkjtnn:tf ower 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 ci:f/3iaor fc3,vy(6 npk( .mr s/zdhmgrcuit,

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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/tje:9 2 ,p jnxovcmljh2w6a6 are connected in series to an ideal battery of constant terminal voltage.wl2 acv jo96m/x ,jnpt: 62hej At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an idea xyrx)y26pqt67k;nrul battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inductorypyrrt6n;q u2)7x6 kx 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 inqcgzzn2 z2 j+,ductance 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 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 inductg ,lhbe)c8/g( hi8ky2l 6ri.vys2 lkb ance 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 series to a battery. The tw c72;c:zu c0p;wq x kmlm7l0bae tx31ime constant for the circuit represents the timek uwc0m;mez q2l73:wb1xac7 ;ptl0x c 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 co. ,;9y nofgbrbnnected in series to a battery. The battery is suddenly removro;ybgb ,f9n.ed from the circuit. 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 havev4iibso 6(8l j 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 this circuit,kel+x0 c*llf + 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 po5 4bhnt(+(r0iwri 90hzei 9 7ykkgf ipwer supply. In this circuit, the currentr9t7 krhib g4y+hfn00eiw 5 ki( pi(9z

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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 c6q-d*hgbc*atz b+/0ae p-+ins-i udac circuit changes by what factor when the frequency is triqa +ucbz ib6**d -hp/-decint -0 +sgapled?

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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 voltag2ibe ks,up(6m*caoqea2 9 uk 1e across an inductor is doubled, the inductive reac(qkabeai26ks o2,*e1c9uum ptance 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 voltage across an i vb;6fw erhjh g1gn8l l4p.b:*nductor approaches zero, the inductive reactance of that vgng.4b1:;bjh8w 6 * fe llhprcoil

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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 cqin1 xz) o+n4tu p54ybk fs*. :/tp85pgb kequonnected to an AC power supply. In this circuit, the curren)4 qzug5/1p5 b 8*fyk bt:k.s peonitq4+npu xt

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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 circugh46dsn (yq2l zv2 zm +0hm;vtit changes by what factor when the frequency yqldm6( 2vnszgz0 +;hvt24m his 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 approa. vv t.kfm1kszvk-bg ;g5nx78ches zero, the capacitive reactance of thagz8v7kt xs.1;mkbnv. f -5kg vt 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 indu dpsm(jia 0nfn- fh,(1ctor and capacitor in a RLC series circuitipjsnm, an(0fhf 1(d -?

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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 defined as7 bay.2lrx ufn av41t, $\cos M = R/Z$, 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 if R increa2m gm8*xs+i ny-gdjlfxt.6x5 3tjp0q ses. When is this spxg8+ tjq2n60i.j5 g3m -fxmxst *lyd tatement 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. x+1yk vw7mrb0 The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedancdp9t6kkwyl7 3 v *de7q-wok)t e 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 capa6nm0uw g0. .tt*yfpk zcitance both double in an LRC series circuit, the resonant frequency oft0. pkgn m.yfzwu 0*6t 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 applied volta 8.nkvays 1di2ge. 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.5-ocat70 l ojse v;-5ekqee8 4-zvx+tdawj s circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fiel x)/yz.zrlg;+zap ud 6d of 0.20 T. Find the magnetic flux through the loop when the plan. pd u)yx+la6gzz /;rze of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating i9s6e y-s+r+yjvk4od,et:e cmn a uniform magnetic field of 0.20 T. Find the magnetic flux throughy emok+r-6c yes+9dj s4,tv:e the 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 radius 0.10 m is rotat0 xw+ 7fgfl32)koeh aeing in a uniform magnetic field of 0.20 T. Find the magnetic flux through the x2e+hk3f0a)ef low g7loop 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 ozed xfs)w. 71(y y57:ad*8b imbqzzerf an adjustable 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 cowci;aet/ j3l 4x: q+cxil 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 of wire on a square frame wdtr jc5:yu lt u9)m;6aith sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the 5 tyt6:ruau)mj 9;cdl 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 clmbei: c )jz(1p (:gxand 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 areahuek alv05z*s 4 0vntsx7g1c/gn /6jp $0.20 \; m^{2}$ 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 w.*qx pv*wi7i ting span of 60 m flies horizontally at a location where the downward component of the Earth's magnetic f*v*wti .q7xipield 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 angu:if j 19qvw 61bozb)a nm7ucx;lar velocity of 2.0 rad/s about a vertical axis throughnf;q v1iz196)bowu:b xm7jca 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 l *s3 mz(du.b(g)q qqcuoops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 tuv,,m3x vt9z kqrns 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 loops on its armature. Each ayv)ya3cy d59 ti m-vq sb8rtl-)v8d,pk3 x2yloop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will bstt3v p-dq mydy8ky 3cvx52) 9,liba8ya) r-ve 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 of9nxjcmq .z,lmy s4d78 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 cons f;uj41z vta(utruct a simple AC generator with an output of 12 V maximum when41az uv;jfu (t 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 generator wik,y+usdjq) ;6 4nh.-u1pvdif wh o fb0th 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 resismg .uuadfyp pd0400*:1 kvn,fypueh; tance 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 ofkzsau(i)aa0b 61m+ iltd7 xy831p)vh xep;aa 6.00 W. The motor operates on 120 V AC, and when running at full speed i1)t k;) ia687lie 0uavxza+3( h dp1pxs mabyat 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 resistaat 4 broy4o:2once 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the stao 2o 4yaotr:b4rt-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 cl.zij v4b9w; ystt7j/onnected to a 24-V power supply. The operating curre tvjt9/y4b ;wz 7.jislnt is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connectk ;+xkj6qmkf cm6+9ecql gxhk 842g (ged to a 24-V power supply. The operating current is 1.0 A at full6gmhgfkx 8 kjqe(lm4kkc6+qg;+92 xc 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 primarm.as,fk 7oa0+2ny2t fnz eq*gy 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 transformq5slls cj6q+*y * jj-ber causes 14 A to flow in the secondary. How many turns are in the secons+cll-6*5j *jy bjqqsdary?

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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- to c+w- xqad,g.cp87nV primary if the 24-V secondary has 100.twc xa7pog 8 +c-,nqd 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 qo +p txkn*tnk, 4:m(hprimary coil and a 2000-turn secondary coil. If the current in the sect(+pn h4nkqk otm, x*:ondary 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% efficiency,e/kd;aj )pm r. how many amps at 24 V can flow in the secondary?merp.d /k;a)j

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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 ni0a3lgbinr n5g1e;8i eon sign transformer provides 7500 V at 10.0 mA. The primary coi1lg ai;i n08i5 rbeg3nl operates 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 u b/w50 6kf ooiaz q19lnh(sb4coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltageo4qw s 5(6 zi0ukafhb/19ob nl is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on i9z8w bd, rl gxrt2:k2 8skg0syts secondary coil. If 120 V at 2.0 A is applied to the primary, what y0x gsd9rbswtlk8,:2krgz82 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 tra/oh-7mc r gb4tnsformer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect thtrgc/7o -hm 4be output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 20 xgk2 *omyvrjh/j93f7bax: 3o0 turns. If the input voltage to the primary is 100 V, we can e93 m:v7jr3ayg/kjoxo hb *2xfxpect 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 transforc g57mxmei.1 imer has 100 turns 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 (neglecting fricti i1.e5igxcm7 monal 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 of3 apaek+k1sodu,jjcg k2-d d 4 4 b;pjc3nh4*p current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power3+ a1 jug, snbapeddj4kpch;2dkcj*4k3 - 4op line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usualvza vz7/;ro7+dir.vk ly 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 transmiss+oaiv77.d zrr ;vzv/kion 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 12,b bz9-* qvxgv0 V. The voltage is usually stepped ub-vqz vx9g,b*p 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 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 hlp9.k 5gk(v ya total resistance of 0.60 W. A generator produces 100 V at 70 A. pk5gk9.(lyv hIn order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy 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 c m-.ytiifp7ta-w,l6W. A generator produces 100 V at 70 A. Ina7 titip y,6w m-fl-.c order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 100 s5m e6pd age/6 bl06h pk,qywv46jy)u0 V. How much less power would be lost if the power were transmityu 5jw/0 dlaeb,s 66 v4qpe6g 6)pkmyhted 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 44 jyx *d1rjohghb /mzw :,dsr1dy.v++r;uok 5 *0 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must thxrh.o1+/1*dju: ysghbrj o,d+5 d zykwm;*rv e generator 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 i1g n52j1:mg p/rhrwgA. How much energy is stored in the coil's ma5p nw r/h2:1gggm1irj gnetic 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 contew1je+fh3:5b p /hyliains a 6.0-W resistor and an 18-H inductor. What is this circuit'shy f p513+b:ehj eliw/ time 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 c ,ko4t5hvex lun n;9*1g u8ieAC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC ouz 2f w(rrp-8do 7jpew.tlet. 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 is the resistaf rofy l5f jvna7tyie91sv+ :v-0-.lrnce of the lamp s-+ly7tr0a1nify:- frfvo vlv.59 ej?

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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 +-pno/;h xfc.hmt 15zz iu2axcurrent throuxo- z5za;h pn/2.t 1cxu+fhi mgh the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the p-kn 5: h,whpbz*e- h0fwgqz 8cower dissipated in the resist zk-5h epgh,- :c8bhw*fqn 0wzor?

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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 reqws5; erj(i,p 4wg;d5)jxxmosistor 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-W2mu8* whe..-7fy 5kt waufgyto ; v;ck 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 resistof,s1mbq 8 d,b,zs8dmo ;cla 1vr 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 a 1.0-mH inductor at 60 Hbtou fa 4is7 5*:k7ii4k1 csup8i wn4ph5(bsfz?

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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-mH coioflr+ mal3o+q74m (:rc8 qmif l 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 inductiv o22ed,eff 5xte 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 reactanc(kaqgns -wlgb 5/07hue 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-mz*1t9qgwbw.xvxo 9 9u)v o kz 5w,w+lmH inductor when 120 V AC at a frequency of 20 kHz is applied wwo1 t+9 wql9uk*5x9,gvm xobz).vzw 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 throughscyfv5cxlnbp 22 e;64 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 capacitiv*zz;3v1 0q6diranhq le reactance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 5 5i-kyr/vytr90 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-mF capaciz0gtn yi 3z6c6 f5xwd0tor 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 capacitive reactance of a 0. r,u;hgq,uba0f (o0mh 010-mF capacitor be 100 W?uqr0 guob( ah,hm; ,0f

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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 rl/ pdez6.f8rcapacitor 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 Wddf8 h.8d52mnac xzw: inductive2 dc.d8h8wz:mn5fd ax reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0.l)) xu:s ihecf/xn2h -mF 2inh usxcxh :f. )e)/lcapacitor 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, 2f17.mylf by.+eie3m a ty8et+0-mH coil, and 1.0-mF capacitor are connected in ser+ iy et7b8 laefe1mt3m..yy+f ies?

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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 co854wzedejpz3 nnected in series with a 20-mH inductor, what is the impedance ate j dzp35w48ze 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series withd yrxj *( :/kykquj5a9:ns 9mb a 20-mH inductor, what is the phase angle at 1000 Hzkm (5qxb:*:jj /9yna sdu9ykr?

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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 a 20-mH coil and 1.0-mF capad8 nk6/:fh p wi v .-ohveotn(9u-0ifccitor for a total impedance of 100 W 0i-t(inhpe/ 8 9:6.-h vkf vu nocfowdat 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 followi+zu8*j9rw gt:gan:k s//w d zpb):ut8kvwtm4ng capacitances is needed in series with a 100-W resistor and 15-mH coil to get a total wtwukt8wsz gru:bv+gm: n49k/ * dz 8p)ajt:/ impedance of 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 i vezg2xf g v8teko838:n series with a 450-mH inductor at 5000 Hz for a total impedancv828ftz gx : kegevo38e of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-Mt8o3w+bcl 3lk Hz for a total impb38k+lw lco t3edance 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 cap( m)hlf/kkiv7,*jy gc acitor. What is the impedance at 10ymj/,iv 7*kcf kh)lg(00 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a c0bpg*gn3s f qd38z ql ;*zy/xtotal impedancefbd sg*z/3q q;3*yxc0zpnl8g 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-a43-tfuy iz 3imq9b+xmF capacitor at 1.0 kHz for a phase angluxim 3y 4f3-bqtaiz9+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 in sep1pjk( jhay2,:p,.h4q avc dvn0g(bl ries with a 30-W resistor at 1.0 kHz for a total impedance 4(v,dha:cpy2 p(k .qlan01g jbjvp ,hof 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 fsk *8o+ 5mmfb p mkisj7f8 803q7ufuk100-mF capacitor at 120 Hz. What is the phas5uf3 k*f7um0bkm8 p8ms +8ifojq kf7 se angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows atl 16tm (snw,se 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serist mn(e,l1s 6wes?

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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 0.uu1we,z*s-l 9v,civ i350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is thu-*9siz1,v eu,i vcl we 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,yheov3 /b+o (4l:i xe ets5zu6u d.w)e a capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What cult6b o. wes/3+oeudi:)vzxyeh e(4u 5rrent flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resisto*f. nm+vxwh2d1h6 l for, a 10-mF+oxf2 d lm6.*v1wnh hf capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a m,r7w l0.iwz/knw/gk phase angle of m,i70/ zkrw.w w/lkng $40^{\circ}$ 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 .kzcp35 o mug*i7v0ddmF. At what frequency should the circuit be driven in order to have maximum power tr .70 c* p3zm5vdoikdguansferred 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 6z5pnx(f las/di x2-bwq+vp3 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V xs-63p nq dipaw2 /l+xfzb5v(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 circui,k;u.ahb i 2hbz rhh;6t 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 resis 7b0 njerjn+g;qv8r,atance of 30 W. What is the power faerv8jjnn;b+7, grq 0actor?

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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 seriesd :g3ts75fy gz RLC circuit containing a 50-W resistor, a 10-mF capacitor, and ag dfs53zt:7yg 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 capacito 5 ds5aab,g+gecn5x (uy54zker and a 15-mH coil in series?4 k55uzgscaa+x5dgy,b e (e5n

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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 capacitor for a resonant fd+16 5xm,n1fwkbla xerequencynkdb,5 11fxlxmaw e6 + 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 in series with a 3.pg0m38w t/ihj)7 pdzs7-mH inductor for a resonant frequency 8s7zhjmpw/3) 0gt pdiof 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 series with a 30-Wr2,1fmb;j xx z resistor and a 40-mH coil if the resonant frequency of the circuit is to berjxm z1bx f2,; 1000 Hz?

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