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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 of magnetig6ni i)nwpv-la.szwg 3 + ;;xwc flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states th0 pg34xn43jnv+k woqu(se 2yz at 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 l l 5lt+vz xo8:o7qfb6what kind of change on th5qtvfxbl:8 67lo l +oze induced $emf$, 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 ax/edj/em9 /gop +:zr n loop of wire produces what kinpjn e+xd r/ emo9z/g/:d of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wir5ye 6*xd5xn2oxxni7 c e produces what kind of change on the indu52onn7yxdi6cxxx5 e*ced $emf$, 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 magnet9yf6o)0hoecun3j2s r/y /m9trw x6bv ic 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 direction of ay quxq0i8c * k36/4( lehvgwwrn induced current in a conductor will be that which tends to produce which of the following effecq/hw6qg8c*x k (3v u0yi 4rlwets?

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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 flatsw9tbg.lz )d)ufmf((s(ls irghrf26i /go 4+ on a horizontal table. A bar magnet is held above its center with its north pfu4 / (t.gi9)wor fd2s(ssb)lmiz+h gr(gf6lole 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. avc m8 9/kl qyp 86o/vjbqb)h.A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the9ao8) q.q8k/j6 ph vcybl/mbv coil, the falling magnet 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 field vector*0y 4-d-( u + -vecsayxlbq+5lajs mxj points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense(va-+qyscm4 -l+b0ux5 * ej lasyjxd- 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 whe ),p+vtg+rb1mf3rft ore the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the d+fbr,p tgr) 3t+ovf1mirection of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where thi d w3u6oq75 t(o7cszve 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 fi7tw5 7 csvuiooz3(dq6 eld disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasis+vu,mymg(.7 ltw c.eng current northward. Two coils of wire lie flat on the tg(+ lv .s cuyw,7e.mtmable, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the n.enu ., lv,sjq ab88fyorth pole entering first. As the north pole enters l fu8,.n,.besv 8qajythe wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular spe bxd 10ti0/kiewfdt3 yr(owhpm 2x/7: ed about an axis whose direction can2b 0y fxirp(3om7/xd e d/httik10w:w 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 the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axzcnj3 lff nn*61,qmy) is whose direction can* f nnm) nf3yqc,zlj61 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 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. 6sw+aq8k) s ctes;nys9k )r3n
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that s f 0gsd5w(w/ thh+u*1gr;nxk 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 magneticu ;-pf 0yyuwgxo6 w8j6qa, a-x 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 w atr+iq kw)orv4l5/u-cem,:the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a st4ovml ucwr: /w5keat ,i-qr+)atement 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 velocit*tm;zriv45 niy $\omega$ 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 tranmp*o8n p* -oqpq/75wq ad+an isforms

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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 seconnp*dfm 6d/wp1 f /i:fbd. The frequency of the pm*/d f6p d:f/ifw n1b$emf$ 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 94:ekshnqz:xr- ws7g gn8ce2 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 that/z57d(o 2e ubbtrsu+hit/n j8

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if2 d:uok 6-80oiz wpvyj the secondary coil contains more loops than the primary coi pwu:vyjoo -d6i08zk2l then 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 th0l;gh 3 kmhb3xan the secondary coilgl ;30kx 3bhmh 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 power in(jtfm9rf 6m(z4.tpwt), 03 llh 6vbd w zuw-owput

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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 resonanlc a7-8pi1 vtvt 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 u.c86ef ut3yg wm j53uideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acrossuwf3t.jue8 g6 u ymc35 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 inductorof82 fip g 2 72ficvtu q.:boj7d-yex4 are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the bf82.-v2u g7fqbc e4y2o:dxot7piijf attery, 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+ ))r lht-q.s:oks(pdfd2qqg 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 inductak6(dncmrg..iuyy ; ;k nce 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. p0cvitd6 2t8jw:h :meThe time constant for the circuit represents the mj2 pv:e d6t:ct0hi8 wtime required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected i6* gcrdd nvi;.n series to a battery. The battery is suddenly removed from the circuit. The time rddgi* nc; .v6constant 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 savq-tg7r0x-xu;f e t- fme 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 thcs1jtq06 iygy 0y+n- du0*rp his 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 thish/p6.ps (ad cd circuit, the curren.shd ( padp/c6t

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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 cirw veu+cjg) 8y;cuit changes by what factor when the frequency is tripled?)u8cweyg;+jv

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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 t:5msv uxuem51 w5xqu)d*) zgz he AC voltage across an inductor is doubled, the inductive reactance of that inductu gumz)m sdveqz1*)uw: 55xx5 or

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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*t9pbjde 3z et v/1:orc(0 fa dbjo;9cnductor approaches zero, the inductive reactance o1r0ef9p:dz/j dcet bc 93av;o b*jot(f 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.6srmz;)bh o +zs7qt 8y In this circuit, the current zm 7s8bztqo)y6r h;s+

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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 bdxic: m4i 1k97 oqgi-by what factor when the frequency :ci4g 97 omqdiikx-b1is 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 approaches zero, the *mssqyqt,1chgj k/uaq082g :capacitiyq*m 0s, g/c12:gukht8jqsq ave reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the s9 73brwo9+ szr)et m) jf qe3nar*vs*inductor and capacitor in a RLC series cir) o3 )7 z3sjfat9brrs+w*ee9m*rs n qvcuit?

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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 qudthd 2046meh 5gvqs84aay, an RLC 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 increases if R lr s840)dxcp1ue) xh q5zy7uzincreases. When xcyzzu0d 51x ) 4hpluqr7s8)eis 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 circui 4xsqnz8h 4zy6 yr4-fot. 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 impedance of the circuit increases iwn0-z/. k irpvf $X_C$ 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 andhg yhq;;;)gierb0yv6vzg0t 7 the capacitance both double in an LRC series circuit, the resonant frequency of that qg0 7;zh)6e;ytigg; rhvvyb0 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 voltage. At resonance+azr jd(vi 50t,

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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 circuit occurs tkn :spo z9d5sqz 4h4/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 unifk/h 4*.:bgz2b zduqw aorm magnetic field of 0.20 T. Find the magnetic flux through the loop whe*4.g :u2/dhb zzbaqkwn 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 unidm k*ka(k(n( eform magnetic field of 0.20 T. Find k( k e*kna(m(dthe magnetic flux through 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 rotating in xkf4slyhj: )4s: h-sp a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when sj)yp4 k shl-h:s4:fx 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 reduced from e80zjepw.2j *7aleqp $1.0 \; m^{2}$ 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 chanm 6nr3vo +c48drgu nemru ;c m*/jn+/sges 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 wixh.j h.21 orim3*1qd ifxi4g uth sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If x*oj2dxuhhf3mgq1i. r.i 4i 1the 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 a;- pqdajwctmur *j;1 :rea 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 a8x8x; cdwf2ret+ vzmk4 g f t7z)/gu9rrea $0.20 \; m^{2}$ 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 whe9+ ahll(8kzy-ul 0migre the downward component of the Earth's magnetic field is9uyh limk 8zlg+-0a(l $6.0 \times 10^{-5} \; T$. 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 thait lwq)z s170jo.,gibt is 2.0 m long rotates at a constant angular velocity of ,wlsib)0o7g .j1qz ti 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loltq9sfqct;joomt-e 1 gjtq 3,).vg m 33:;v seops 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 turns of w r,klug(zxm84 ire 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 armaturelck )aj ve:7e5*f)r;k vrm1y w. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the looa:wvrr57ckym ; kf eve*))j1lp 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 wir+tf- efo3i78pgxrpw2 e 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 generatorrz+tg ,8o5f, kueg. qy with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the kfrq.,ozgugy,et 5 8 +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 r:xpnh )j*g -k-r.t)udaackfy 3-)o xgenerator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor:zbrwmox,dh;07ahyi )cds *2o:f 4 l f have a resistance 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 of 7tdur0so j.h: srlw-c90wxw 0 6.00 W. The motor operates on 120 V AC, and when running at 7 xshdow0 :0suwjwcr 0.-ltr9 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 s mp do25)bgk*zupply. The operating current is 1.0 A. What is the o)dg pmb 52zk*start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supp t2v d:rrfcww/o0;0. 4wltt6u jq x1blly. The operating current j2. ob/4rtuw;ll x10v dw0 rctqf:w6t 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 ivgt;e:pw *h0us connected to a 24-V power supply. The operating current ipwv0tu:g; eh*s 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 vo3s(e ays: oke):k(hto 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 tct4r3p:m, c vveve+0p ransformer causes 14 A to flow in the secondary. How many turns are icv3rp:4ee0+ vvcp m, tn 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 primsmo* w/dse (q4ary if the 24-V secondary has e(dom4 *sqs/w 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn)5zm fpm6;ly/ wg7kmuo0x0qh primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what uw;qkfmx0g y)h/ozm0657 pmlis 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. zg a*vs vg .gpse0bi-,y c57b. Assuming 100% efficiency, hbz.sp vi ,- g0syg.e*v5 7gcbaow many amps at 24 V can flow in 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 at8bs/l0 d( ;z)jph5 86ihc8cvasrxhvn 10.0 mA. The primary coil operates on 120 V. What does the primar6cv5nhjd; z)0hp /88(x habslsi8crvy 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 e 7a+gaw ikh./xs0d9g coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present ie ka/sg0gh7d wa9x.+i n 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 3009yum5jzaf)oh9q8 y i , turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in theu jy9oqahfy98 5 ,z)mi 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 a:x.ec )p 5kz 2un7nxv fj,/i9uqacjb0nd its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondary :/xk7n0b5anf2zc9 u,.jij ) xpc ve uqto 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 j8vi. 2nhs 12b msm5zjturns and its secondary has 200 turns. If the input voltage to the primary 8j sz2vsj mh.i5bn21 mis 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turut -5ji md.k4a5 e4mz;xqe*vkns 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 kem*-teu;k4i5 .d4vz5maj qx onal losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage ihw;2q9 iqd1 qes usually stepped up to 4500 V by a trq1hdqq9e; 2w iansformer and transmitted through a power 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 usually stepp9oj*pjg )206xcr fh 0cl+ueyqed up to 4500 V by a transformeroe0rjyg c6)lpfch+u x09j2q* and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 12w 723oo *ooztxkw8r/ f0 V. The voltage is usually stepped up to 4f ox k73o *w2o8to/rzw500 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 lmy r.pn0tw4;n ong has a total resistance of 0.60 W. A generator produces 100 Vr nm4.pwy0nt; at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the 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 d7 z(6slke k2rsj;-fvtotal resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to hea6 rks-dz( ;2vek7l jsfting 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 1000 V. How much less powu3 hwwb+3jdweh 4(d */tmyk- mer would be lost if the power were transmitt/hw(hw +k demt4w d*3j-u3bymed at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a line w0jek6ic5b 7m. 2oflv mith 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 power? 65imok2fe07 . vmlbjc

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in the ( 0 tb(ive3lty6w4xmb coil's magnetic field6wx(b t lbtiv34y(e m0?

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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-+h*7 sbwbgqvrx0 8 ac4W resistor and an 18-H inductor. What is this circuit's time constant?qhv b0 xb*s c8awr74g+

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms volfr+ 5v wunm6uaj,g+j 1tage 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 thepp *) c;8ud9dvw6nmpmjb0 j0cb-m 3m l 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. sw:wg+ygp0cmjl;kt5z w ; 2)w What is the resistance of the lampy2mw;0+ g gwpslt:)ckj5w;zw ?

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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 c4f, dwto wsp b;q85+m120-V ac power supply. What is the peak current through the resisc5mfsd, q;+bw4wtpo 8 tor?

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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 9+lx x cjh3h:zdissipated in the rxhh3j +x9c l:zesistor?

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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 resi .eh6k pak6/(xol cnx5stor 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 u8 xc .x9a dw.c2b0hyqa 50-W 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 ressqz./i*usl f pj/5d 6 1gpuuj2istor 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 Hzrd ls pxou/;3+zs bqlog528c .?

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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 1000jxsdm +hqnt6qeo m+ 8b1 y7wlo lu7:16 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 reactanc 9rwnx)e . mtg;df89wqe?

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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 )/hly7 8pcd.fv arv c3inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor whencqy m,h8(ix ,tyqe95i 120 V AC at a frequency of 20 kHz is applied to it?, ticy,i qe8q9 x5h(my

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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 7rielstk+: 8-zt5242y)ubl .uo l*jjfzj na tthrough a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive ru*al /+*alzqy.qqm pef l5(8 teactance 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 50 W of capacitive reactance at + moenuu.bml)67 d0db 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 10-7j4 a/dvs ci:lmF 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- 5d9 l/9s7p,h8qjo jwe67hzljn )pu( rgtwh c capacitive reactance of a 0.010-mF capacitor be 100 W?n( ) uj/ 5trjz, pdples-l8w6hw7oc 9hq79ghj

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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.-zj a+dprp9 q70010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.j 17h7hei+w eg0 W inductive reactance, and 10.0 i jhh17g7we+ eW 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 impedancp573jvz1y.wzsa tcq ;e at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series3vc1ypqs; j a.t 7wzz5?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mHi.oql+u jhi. pu+e 62r coil, and 1.0-mF capacitor are .ip6+hrql.i2o u+ uje connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what isksan0;2o ggb0 w tphlt .i.+4w the impedance at 10ng2k0+.l.ot4i gsbpw0 a ;thw00 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 withh;0fssk0d eak7fu*q 6ooe x43/u:p bv a 20-mH inductor, what is the phase angle at 1000 Hz?u4hsq3 uo; :ax7e*/p 0dkk6ebffvso0

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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 capa(2 -* 5kzvlm+e osumnksi 2b,jcitor for a total imp-bmkk2en s v(l,s52*mu o+ijz edance 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 jh/ p92lik60lghs v x6needed in series with a 100-W resistor and 1vkxph9lh 2s6/j 0lgi6 5-mH coil to get a total 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 in series with a 450-mH inductor at 50kxmg-t5(af qmi : f,-o00 Hz for a total impedance of 40000 mf,to -q x :-g(5iafkmW?

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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 sfj*6f i;trp km2:zg g5eries with a 100-kW resistor at 1.0-MHz for a total impedi kr: ff6 p;tjgz5*mg2ance 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 20qtu;4:/ fci*8vuib5b:mru a (l cw *cu-mF capacitor. What is the impedance at 1000 vam ub(c*fb:/tcu4:q5 rl8ic* uwiu; 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 serir4i( sbu 4lc3bes with a 10-mF capacitor at 1.0 kHz for a total 4s3 rbcu4ibl(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 vrc42 5ab l-+vhur2x9a;ntw ) mn5 fpskHz for a phase an) 5w ;9hr2cman2tu5f 4p nlabx+vsvr-gle 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 resistor at 1.0 kHz5 -; x;jnsm yol,azse)1uq w+8bokpf9 for a total impedance y8fjnox uo;m;wb 5 zl ssp e9q)-1,k+aof 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 wiv6gm42.hr px anqm0j 9th a 100-mF capacitor at 120 Hz. What is the phase a2 qm6rhmp 0a9vx.g4njngle?

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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 104faql ;lmajb- eu, *u90-W resistor, 20-mH coil, and 1.0-mfbe94-a lmlq *a,ju; uF capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, auz0suvlue0s* ,+n ar / 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 cur0zu ln+/ 0su e,vasru*rent in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive re bmzq* t2-y:boactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz po :b2m y-qtob*zwer 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 fo+7bg riti)t) zie--s kr a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-H g)its)i7ktb+re-zi -z 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 i q;ju2(;hy4dgctte rk 93 ,js7rcn(ayn series with a 500-W resistor for a phase angle o; (g 2chnaeqtry;jucy3dj9 k,s t4(r7 f $40^{\circ}$ 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.m cd,zs6ldhfq4-a,nsz7nv 9;0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred fzn l,;9zn7f mda6,4vscsq-hd rom the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15.0 Ww v7vg;+2be/e;;qm lw sx vw2e inductive reactance, and 10.0 W capacitive reactance, when the circuit is coql; /bg2xw2;svwmv 7e ;ve+w ennected 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 Aan.7xdo f+i7b C 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 ( mzhy (f(c-yta resistance of 30 W. What is-h(m( zc(ytyf 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 factox)x1deboo w2u8 gnp9p7 k4bod(ya9- yx+f zq4r for a series RLC circuit containing a 50-W resistor, a 10d2xw+b9yofgn x4b8)4pz19x pka7 do-o ye uq(-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequeqdt:om 0 y*0afncy of a 1.0-mF capacitor and a 15-mH coil in series?q 0*maotfyd 0:

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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 fredp*ad- x(9dpuo4 7u ooquencyoodxu od-94* p7 adu(p 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 3.7-mH inductor for a resonant freqfl8jvoc .v:j 6g+crf+uency of 10f +rjjoc:6 +f gvcvl.800 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 beg b bj-z/5h6i)iau8 fsbbu/9o placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the cu/bj-)abi86 uzbg/hfi 9b5 osircuit is to be 1000 Hz?

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