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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 a q2e6t /fay0fg.nu0c: xe y+wfre units 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 ind c3mma1c9dz/ge ayj59t 7w58n;vwtavbp -*p cuction 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 wire in a coil produces what kin ;z*6a s;u+ ods)dnwwl; 0cxlyd of change on the inducedc6dz ; wa)x0yw*;ssl+lo udn; $emf$, 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 p78nl+ hxv2ytm roduces what kind of change oxml7nyh t+82vn 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 wiuxn v3ozd)uuw1 (7s5yre produces what kind of change on the induceduu(dzyx7 3 n15s)wuvo $emf$, 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 f7 ri(n.gxsgod u,p/1.oxe+ m iield 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 direcl;uy b s+/f)fb3/ zdtytion of an induced current in a conductor will be that which tends to produce which of the following effydfs/ +b3ul)b; yf /ztects?

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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 horizontale x :.j:k)d c*nc5hqql table. A bar magnet is held above its center wit:5)dnc* qjcl eqxhk.: h 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 isde-m i 3,xxj obv8*5fc-t lhf4 held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magne-v of4j xxel3bh,cdt8*5mf-it induces (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 region where the magnetic fieldpi,l/ huw)jxv2yp(c2 vector points straight up. The magnetic field vanishes suddenly. When viewed from above, h 2 pjl2wix y,/up)(vcwhat 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 whl8rqf (*zzsv4 88c ccpere the magnetic field vector points straight up. The magnefv48rc8sz* lcpqz(c 8 tic field suddenly 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 ti:a-otw.5jvv4 unyl ,op 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 cytuw :ol.vv 4a -i,nj5oil 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 yl)m* g)jd;em lies 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 wire. When viewed from above, the m)gm;)el d*jyinduced 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 entering v f9 ctu0;uw:z(xu,gifirst. As the north pole enters the wire, the induced curr t ;ufzicuvw :9,0(guxent will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about anq47e zm qlc9h; 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 rotation if th74 hqmz9lcq; ee 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 mm x20fzyrre(j 3d (jf4 c 4e0iuup3i0at constant angular speed about an axis whose direction can be varied. In a region where a uniforjjrxfi2(ze(immcud4p4 f 00re3 y3 0um 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.yh,tuf 0rv0 o; b(qb-zfi6 w-v
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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 tha 9+ h gj0xcy8dl:okbj7t 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 lzz0*znrba(ny g( ma028 bzx(lhhn1 (magnetic 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 d8fy; agh:zpr,irection) is moved northward at constant velocity;g: f,a h8pyrz through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constan t(a.i-wei6m .k+w vkxt 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 generatow wu5dxz4 fg3jv6kx8: r 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 freqrb;x;sz:g m6vd(3 k: b pc79nfq3 (sijzvhx6buency of the z:;xzsbk( rnx qhc6i j(3s p3:v7 vd;9bfgbm6$emf$ 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 us)65iv+q xfo n +,/cdio mnn2j;isxi3 sed 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 thafm;-ht d7udi.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 loops than the primary co lo.p 2uq)f*d v+z.(fi nj+f4lq )njgez,kz.wil thenn qv2z+)ej* 4 k o.) ,lwdffj+qlg(.zn.fzupi 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 looocbpb ) s8*3mz1xs*cs*b ooj;ps than the secondary coil th xsb3m*boj;8c s1) pocz*bo* sen 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 powerejyylr6gclw h5(2 (. k 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 circuiy)w2c6p1 a,: exsadzv t,

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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 condn ( 6m/lkns)lnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with th lls/nd()k n6me 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 n l/-mk; ;xl*ru7 omznare connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with *ml r; onu;lxnm/k z7-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 r7 fe)w9ya 3fhzesistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistx4bev;hpu5px f ))z)ee q. j5aance 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 arevz mjnkhyh*, gyejl4-o(8 7l*ek (1nu connected in series to a battery. The time constant for the circuit represents the time required for the cu n(*ly m7v,(8jho- n*helgujek z1k4yrrent 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 inductorc /7ok(t+kb h:ldf+ieyq6zn c;q ,xk7 are connected in series to a battery. The battery is suddenly removed from the circuit. The time cobxl7+ikcec kkq :q h( y+fd/ztn;6o,7 nstant 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 unitn(xh;4 6tk/0idrtlna s 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 this0u)lilv q;rts1m3r0 1 e 5ynz-b0t dlt 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 suiz;ob,-2 3xhxokevgz;) i 0t opply. In this circuit, the currenxbgzt;o ;h i- 02)v3oxi, keozt

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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 amot3.yl ov bl b792(huc circuit changes by what factor when the frequency is tri3l2o y o7bvlubhm(9.tpled?

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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(zr :if.s otj r9(cbw2 doubled, the inductive reacta .r(j rzcb: fotiw29s(nce 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 anvkv v0hc2um5 0 inductor approaches zero, the inductive h m05ku2cvv0v 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 sup0)*/ivqonpwqo /y u, qply. In this circuit, the currenti)0v*/ono u/w,y q qqp

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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 a)v64l+do)ey pyre w(wc circuit changes by what factor when the frequency is eo )pl)(v 6d+ yw4ywertripled?

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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 acrossh: pm a8;jup6i a capacitor approaches zero, the capacitive reactance of that capma:p hi6ujp;8acitor

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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 be3(aqgwl ,cx+ sjw-m:j lrt8x;b60 omr tween the voltages of the inductor and capacitor in a Rc;8w grjjw( +lbatx3 lmo:x-s0mq r,6 LC 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 68vv39j z2 jef-anio e6e)rp(v kwc(zRLC 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. Them uie+1szruv c /stoe(;*gtg0,am c3, impedance of the circuit increases if R increases. When is this s s uz s(c,o em;gt3u1 +tm/cg,rvaie0*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. The iu39jjgtb w1u/ mpedance 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. gmuadp( ;.-i)-/vyaymo w )jz 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 serj1a u3p9f/m 8ibjgax/ ies circuit, the resonant frequency g jbj/f9 8 13apuima/xof 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 circu(e pttt2zgk fvtqh*.24 qd vi4yfk.24it that is driven by an AC 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 circuiv,1yfh *rgaj kvp1c //t 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 magnetao.*p+ s qx,ussr(rp 6ic field of 0.20 T. Find the magnetic fluxrr s (*uq.xpsp6s+o ,a through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uy28y(phs4kow.5b(c a( 1 edpjmckb+sniform magnetic field of 0.20 T. Find the magnetic flux through the looy(p(hk b51ajs8e.( 2co mc+sypdb k4wp 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 rotaibi(stz2u 4mhf9j z y978z8ue ting in a uniform magnetic field of 0.20j9hz7 9 i2te(z488ufsy umb zi T. Find the magnetic 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 rpeoou,jy* )/t ox xfl-5;z q.keduced 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 froc 5z7spozs-r; m $4.0 \times 10^{-5} \; Wb$ 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 20.8 be;ngsl/ dv0 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to thevsgl.b8 de /n; plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an areaw4gce k+65yvwok w )h6 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 xg1t(kpoxz1t4g *m zzt1 t5lp.r5 tx0area $0.20 \; m^{2}$ 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 c .d;1. :(b pipwuthfzo(l; mam flies horizontally at a location where the downward component of the Earth's magnetic fiedip(u: (tz.m f1wa;o.;l phcbld 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 cvak8k9r0opekxs 2 m;xm.v+f0r nk *y1onstant angular velocity of 2.0 rad/s about a vertical axis through one of its ennkkk0mvf+xe9;mk y2xpa *0s r81o vr.ds while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-st;h9bxp+d:j r ectional 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 1el1 :p 9v:nm-nta 6vsk00 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 loops on its armature. Each loop i40gbl(6azd,y :rrph s7e. w pes 12 cm long and 8 cm wide. The armature rotates at 1200 rpm 0besrld.(g4p7hw r, aep 6:zy about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of o;o3h6 j-aaq7ziw wx*5 /et lzarea $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an 3n 44hz w7ku 0g7 jadhxdb5+lqoutput of 12 V maximum when rotatlk43qwndzx5h4j7ad h g+ 0ub7 ed 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 with a maximum nr 9nty 0ptz+1$emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. )a y:a 9mc:w vuv+i1ixThe 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 resistance2gm .vy/o ;rv:q-rdly of 6.00 W. The motor operates on 120 V AC, and when running at g:y lor/d2vy;qv-.m r full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power sunl-0k)hje7 fvwb bqi8g l1(2 jpply. The operating current is 1.0 A. What is the start-upg7n j-lfk v)qw(bel 2h10jb8i 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 0t6wi) nz7,x iis.+b :ff; zhbwadha -W is connected to a 24-V power supply. The operating current is 1.0 A 0xhz:fb7.6whs i,za; fw+ indtb- )ai 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 internalo w;k uz+x 73uzs2+kuh resistance 6.0 W is connected to a 24-V power supply. The operatin;+ +u ks2k3zuxuh wo7zg 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 prso4j +xvkntx; p /c160l 5cxjeimary 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 pri; cpn4(6qx2kh;a m xec0 fq-vsxzex5 ,mary of a transformer causes 14 A to flow in the secondary. Hk-2c;f5pcnmesxhq0qx z(6x 4;xae,vow many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if theh*8li* s77milf vk0ph 24-V secondary has 100v sll7f p0m**8ii7 hhk 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 primary coil and a 2000-turn secondary coi+(h nv.+ocjq kl. If the curkqc. j(v+ o+nhrent 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 transfluk*(yyz,awx+yb, o7ormer. Assuming 100% efficiency, how many amps at 24 V can flow i,(wayyuyxz bl*ok7,+ n 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. The p:f -aght 5*xrdb )wg+ g8akit+rimary +aa5*wfggg-8i rd+ k :bxh) ttcoil 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 oos5 fb6g8 ksb5j/p , qpo7t 3bxpd4.snn its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to 345d o7 boxqk.6jpbpgs8/5ns fsbtp, 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 primary coil iykr ;m xm; tq(s380chand 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in thk;m0ih rms;(8 qxtyc3e 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 seco-77uc1of3 kwqzk .oia2tgxa ,ndary has 200 turns. If the input current at the primary is 100 A, we can expe1w-o2aziu ,o ca7 3g tf7xq.kkct 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 tran94qw/ e.;,g. l oqbxd/ jvyxzs.cxbs;sformer 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.b.s94q b;c lg/zxsdw jq.oe,x /;vx y 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 transt.fuz mvi+m 8x q74qhj4e6ka;former has 100 turns and its secondary has 200 turns. If the power input to the primary is 10qu ;4 m4em6h+7fai .8qvtz jkx0 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces +p) f,l )r.-lm:ysh egx,bgvf60 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total r)+ ,s)ypx:,ebl lrgvfm fg h.-esistance 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 ims l*5:lrm llpnyr)-2 s 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 lrmlm *p-25 )rl lyn:sline.

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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 curreo7refs) .0l vdz3dgg /nt -ly5nt at 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 r3t7l 5ddz ol0-.nf/s gvyg )eW. 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 lni) f +x,ze5blong has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heab5,x )lz+nefiting 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 W. A gens7ac6ivs , ix9cgl8l k*q (cjq ,c/m3nerator 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 k(ccms/3c q gi , 9l78xvcniql,*as6j100:1. 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 dvmnvkp9+ cm5 u e)e1dq-6proh-ol3 s 1own a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V iooqlms)6+3de vu 11 v-e5kpr9mpn- hcnstead 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 trans mp)s wy,q(dwt:qy 19bmitted 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 m 1tqdb p(,swq) 9yyw: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 in ths +dqa( ;rzox her1j;* g9xhq sry74f(e coilr 4g oayr (rhs; f97hjxq1z+dqs;xe(* 's 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. What a dr(c3yx.o*wis this circrxw o*cd. 3ay(uit's 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 voltag us/rwtknw5(b 6ly.7 ge in an AC 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 outlet. What is the pz7g g0,(txqj z5mjur /eak 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 re o exg0u )c.pqan q7wcu,w9fe+3a: c.psistance of the la.cxwc0ecwn 9:3qa u po gq ae7p.f+u,)mp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connectu/2 es:2tk:ryik0va4w 1) sguz8ka tded to a 120-V ac power supply. What is the peak current through tuy1td )t0r4ikwg/2 aas::8 ev2 zkks uhe 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 2keidu9ho;k /-V ac power supply. What is the power dissipakhi 9d/;2eukoted 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 50-W resistoplwcn q85as nbld d -;.n)*-sdr 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 mbykm9z .b l1.q:ol c 5bt-cw1resistor 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 g mi:m;gpw- t)/um pn550-W resistor 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-l siuq:hu 96l s)7dr-gmH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1000 Hz?wz ( /tw(nw+:b/n:qqk e,mvcu

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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 ina (r-ic4aa)mp ductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 100 uy8r;bn9m6u jtp igx -7e)cri 7o6bm20 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 ind9 rc rwaqn773auctor when 120 V AC at a frequency of 20 kHz is applied to ic3n 79qraa7r wt?

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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 t/*j +ozh f48ycybonji845 cytutw(f7 o 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 o jzkzm82a:q) 1 9m lxcam+2vja 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 (*xfr b0 w2sibneeded to 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-mF capacitor have a reactancsa +i* 8wel+tve 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 ths4g gb 4pa*g:le capacitive reactance of a 0.010-mF capacitor be 100 W:bpa4 gg*4 gsl?

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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 at33pwct pgyk7; 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 resistancxz6 k)xzl rk/5e, 15.0 W inductive k5rx)z lz/6kxreactance, 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, f4r rxyztu4-sr2y 35y20-mH coil, and 1.0-mF capacitor are connecry y5rs rt 34f-x24yuzted 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 150.ar:ubc;w8fr1/d n t g0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected i :arntbduc/gr;w81 .fn 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 connec24 j+gpg,gdguq -f1bt ted in series with a 20-mH inductor, what is the imp4 f-,tj g2qpgugd1+ bgedance at 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 i+y:coa o/;cs5ndf863nq on riil6t 3dp 2hn- ks connected in series with a 20-mH inductor, what is the phase soanoinl/k65cdp;o -+h f2 cdrnq y:t83ni63angle 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 seriek,)q0 o dykb cqm14f.fs circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1504 0,kd qfoq .y)m1fkbc0 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 capacita q,l+:h7icvyl nces is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W atl yc+l7,hq:v i 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH induct m iy+*o:4 lya2yqwey y.7,tesor at 5000 Hz for a total *m2eiyty:yl a o4y.w7yq+e,s impedance 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 seriesek-z2y b1 5mtco g++gso i7amw 0i:oi) with a 100-kW resistor at 1.0-MHz for a tot)y:t+k m0c m2bi +g-g7iiowoe1zoa5 sal impedance 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 capacito4w s +5fpd/p;wqm,;rjfjr; byr. What is the impedance at rb;;pq4j+,5mrww ys;jp d f f/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 y- o-tq14iblu at 1.0 kHz for a tota lb-1-t4iq ouyl 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 series with a 10-mF capacitor at 1.0 kHz for auiwxvhj 1(axnm, pg b*+ x,/kl1,9eqdt g2b; z phase angle of x* wpqj,ki9xbd ,1+ m b e g;u(2gxazn1,tv/lh$40^{\circ}$?

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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 resistor at 1.0 kHz fo7gtts07k4+j ld ip u8ar a total impedance of 45 W?dja4u7lks gi8p0t t7+

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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 1eg6us z88gqz* 20 Hz. What is the phase ang gq6use8z *8gzle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W rec/+znkv wsp3u 9u yi36sistor, 20-mH coil, and 1.0-mF capacitor are connected in seuu6 +9s3vnpy/w3ckzi ries?

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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 consivbem3 s/cb zg0wu7,z1sts of a 100-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 /bve 13 bmwc7zs0g ,uzin 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 reactancpn s. bguh zz97tmz31;e 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz 93zsp; nbh 7u1m.zgzt 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 circuit containing a 50-W resisto-f p+yb0lj 4smr, a 10-mF capacitor, anm+- b0jpf4ysld 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 wizi9 +87 o tszc:udp;s)tbt2v uth a 500-W resistor for a phase angle oftip z89zc;7:sus+bdv tot)2u $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At wyh ng4v2u:x1wct;7ms s) jm3shat frequency should the circuit be driven in order to have maximum power transfers31xm:j2)vmstg; c uy4swh 7nred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W reaur7l mi/exk12jx+k: sistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is con+a2kxxiu :7 m1k/ljernected 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 circuilj)iztoejj-a pg,h/ r99cpl k x52i 0a 2.meo7t 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 hasr/uyt35a l utjt 7oc// an impedance of 60 W and a resistance of 30 W. What is 7ttot/j5cuy/al 3ur/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 50-W resiq msx. ;bts7 pjdt0m.5stor, a 10-mF capacitor, and a 0.45-H inductor, dtbj s.;5qm .s t7pm0xwhen 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 freqvia di+r0 +5uquency of a 1.0-mF capacitor and a 15-mH coil in series?+5iidqr0 u+av

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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 ad4 p9 moy+8vyjj3 dmjcuscas28 3 :zq2 resonant frequency of oum+4assy8m c2d v83y9z2cd3 :jjpqj 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 inducto uydqymrb jy yb:;i3 k3nl9kw 7t/:e0)r for a resonant frequeniu9knj) e3:bdl0 rym7 b :;yqywt/y3kcy 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 series with a 30-W j wpm /c//kvb(u/1q stresistor and a 40-mH coil if the resonant freqq(p/kb1/ tw /cjmusv/ uency of the circuit is to be 1000 Hz?

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