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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 areg2+tb hxjsx)i0: rsb 7 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 inductio om7yad(ghq1, n 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 kind c* h raeab(8bso/4+anpk9 yb1 of change on the indu/ho c*8saa4+ a1nbk9y (pbberced $emf$, 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 opdo/ 3nvr7lr-; cghv6 uc y(.auii i4,f wire produces what kind of change yi46 v(uiapr.gvor3 hc7 / u-nl,ic;don the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kin(k sd2 g (pv2ahke1x:* czya/.xzt8ged of change on the indu2xk /.phg1*2cszk tve( 8eay a:d( zgxced $emf$, 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 magnea+ 0og fm5mc.*1b wnqjtic 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 0l7d)mkkw fsh(4xt j-an induced current in a conductor will be that which tends to produce which of thefwm4 s 7h-kxtjd(k 0l) 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 e 1np6df8mjb qhi8j+ yo.e8u6 horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magne mobu y8fp8inh1e8dq 6e.j6j+t 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 mag:*hzlhpq4+t:5, k3 cluh bwignet is held above its center with its north pole pointing down, and released. As it approaches the coil, the fq+ihzlt:k ,bwhpcu4h* g:35l alling 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 vectz y(qq*au r(u9or points straight up. The magnetic field vanishes suddenly. When viewed from above, what i*(a uzuqr9(qy s 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 re*dub,g z28 d02czd cufgion where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the02*z2cu d,ufg cbdzd 8 direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnetic field* 3 8e/uspm.s8+ch1ze 37lnyniyifvj points straight down. The magnetic field disappears suddenly. *hiy1m83izypu+ c lev38s.7s enfn/ jWhen viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasincoop( lk d/:nt clk7*9 ts1u/jg current northward. / lookjt1cd/ls nc(k *:up9t7 Two coils of wire lie flat on the table, 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 north pole enteriij2ujy/ 4 d.rpng first. As the north pole enters u2/jyji4p rd.the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular s 4.1y qp nhcbc2e(c qe)6+(fnyhj)zpqpeed about an axis whose direction can be qcqe4 nh2 (jbpqnh )6y).e (yc+z1p fcvaried. 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 angidb udb-g.79q ular speed about an axis whose direction can be varied. In a region where a unifoq9 i-dg ub7db.rm 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.nn+ 9mnw/c 6b8gn5gzv
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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 aik o/w16 *oitgp)gk:en $emf$ 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 field. The ir0p8n8) rdau w-,gzf$emf$ 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 (orie-qj1om* 8vldg) rdswju 8wl24bf r+i2nted in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acvqo+is wjub d4 r* d)828jlr21 fgwml-ross 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 angulaouj(40xna l 2aupi ,4br 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 tq4 ybr9(8dj1:mx kecxransforms

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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 sep ntb2u,p:6sew( er0nq4wo,kcond. The frequency of the, kb(np t0wqweesp 6n 2,u:4or $emf$ 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 t9c u o4jr0rct4 kf/r8y8g5cs fo

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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 tj re x-ggz4a46hat

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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 seky:zrt6a2 bo 9condary coil contains more loops than the primary coi 2kb6ozrtay9: l 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 jcgpb ye,gui5d/hgr 4ta/ 0 ;9contains more loops than the secondary coil then it is /uyg9/te0 cdbggj4ah ;ip5r, 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 p6p m7qu08 r.k qf0qcuali *8jef6mg/y 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 circ08u9tyci/wt 7 ebi)zs3 fe :eiuit,

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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 idehw-i5r x x9nz2al battery of constant terminal voltage. At the moment contact is made witix rzh 2n59-xwh 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: ilo -*xe cr2b8r8:r or0bmwg an ideal battery of constant terminal voltage. At the wobr0: *-lir8 o2r:gecb 8rxm moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to an )8-n2e2 qqig .2 -v qzhsiugaf$emf$. 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*x (k q2jlg+++ld9v lei iwbj1 inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a0rb6j* 6qlpal5.cetm battery. The time constant for tbc6. 6rpl05te jm q*alhe circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductoc8 57yvrxv/g vr are connected in series to a battery. The battery is suddenly removed from the circuit. Thev5vxy8grc/ v7 time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units exc sbgrw,oal g:nz3 ;;9rept:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the curre y2wu2 pns8e:)ud+ ste.nyqht2is-14k3ju u fnt

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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 th 7-n: xt-fevhuis circuit, the currenthf7v- -nue :xt

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactali)nadbn+jj7 4)o3 hgnce in an ac circuit changes by what factor when the frequencn jj)7a 4l3b+)hdi ongy is tripled?

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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 d ).qn1na0 tgb. wk2yfooubled, the inductive re.t)q wyk.1 2nagb 0onfactance 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 inductor approaches z91d9yql65 tvsa4r9kk5eil cce69qge ero, the inductive redeal6vlc1tr egk9cq95945k e qs96iy actance 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 co21wswv 2egryi,k h 50hnnected to an AC power supply. In this circuit, the curre22ghryv eskh,w1i05 wnt

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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 by what factor when a1 5bs1vnrg 7.dfequ. the frequency is tripr7ga5e 1d.fqv. s ubn1led?

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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 acr:bo ;lnlz2h8soss a capacitor approaches zero, the capacit n8olbh;2sl :zive 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 h x;4yf x;oo4/: cwolpvoltages of the inductor and capacitor in a RLC series circuf:w44x lpo yhc/;x ;ooit?

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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 circu.jk+lua5 ola5 it 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 incpw2ml*y0(gd6xp pup* u dwt 5;reases if R increases. When is this statement ** 5 wpx6d0tlm;up 2w(gppyud true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of tms ksyw/nrd1;c1),c 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. T p+9.of wbkg .zi/amx +lk7(t5ge tb3jhe 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 t9y h.m-*vcr pe2 w.yeqhe capacitance both double in an LRC series circuit, the resonant ee* .c.pr w2 yvq9-ymhfrequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. Atmmf6*vz2eb/1r7pdpjszt o,/yt5 dmws (y 3.h 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 circui qh0ecvix893 a 7mqzd,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 unil gd/mpex+)sklj,5.ud5 5c iq2vp. ulform magnetic field of 0.20lj i uppmvgdldx, .use.l c)5525/+kq T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotatindf.ifcab2 6y h50gl8j04kzp wg in a uniform magnetic field of 0.20 T. Find the magnetic flux through2z.k86 cf dh0jya04wf l5bi gp 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 wb(il-p wtk66 is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field ve(t k-plwibw 66ctor 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 io; epw sm./r:ts 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 coil changes from(1udlud,jg b : $4.0 \times 10^{-5} \; Wb$ 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 wi6xh12l rm+czeth sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0cx12z6+e mhlr .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 wirxqrbj4mt r-oy:+v3 h+kugw(6e with 15 turns and 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 ar gg7 2k*1ra8,cby.h x)qa x 5yee1thbvea $0.20 \; m^{2}$ 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 hoel/ xz0 n2b9p thk8v,orizontally at a location where the downw 2kb,vzp 9nxho0/ l8teard component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m longib y;x in(xvcrc )d7pw/ 4 sl+enn7m:; rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic frxl(+dpsci;e nb;x v) :wi 774/cnmyn ield 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 ccj*vz u*a0 tw*ross-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 wire of a4y2hrp *w:; (1otlc9:k phqd szonpy. rea $0.090 \; m^{2}$ 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 qt+ tg//fu.ecbd i;e/ is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an qtub i/decfe;+g t/ /.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 100hai+y17.onnk pm or 5y.w/1, mdjly4 r turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a sij dn5 s08;gbfmmple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnet 08g;fnjsmb d5ic 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 m2rnp vb3cq3 9.jd2lx c;tmfe)5g c x+naximum $emf$ 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. The motor operatl2ho 8q35lf)5 9crpa r4xrues es 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 6.00 W. The moto q c6t;jntv2 /*uzq(jvr operates on 120 V AC, and when ru6jt;cjuvqt2v * nzq(/nning at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is k.s4 e3k ia1.xaig c/ aoksd2-connected to a 24-V power supply. The operating current is 1.0 A. What is the start-aaikxs i2-ad 3s g.1 o.4ec/kkup 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 resistp+zowy0.( 0p4qx(v j gx/ aj(cznd3mqance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full 0/jya+ dg xjznp3q(xvpwm04qzc (.o( speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected +8,h gbo. qn4mc6ac weto a 24-V power supply. The operating current is 1.0 A atqo48.ahccmeg+ n6 bw, 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 rha ky.1 nmv*y6(;prz1cefi,deduce 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 prd+v8ht, hu:7q),d vvbrf:q pe imary of a transformer causes 14 A to flow in the secondary. How many turns are in the secondary?vhtqvvef,+):8q7hurdb d:, p

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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 ij;f4eu 5klp-hf the 24-V secol ej4-pkh fu5;ndary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn s8uk bx7eh))lh econdary coil. If the current in the secondary is 3.0 A, what i)lx )hehu 7kb8s 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. Assumingwm+xg r l cc*h7/i 0c2.vvwb)g 100% efficiency,il2 rm+ *c/cg7bv cgv0whw) x. how 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 trawd(-nnqscf *e59/tl nnsformer provides 7500 V at 10.0 mA. The pdnl(-nc9e*t5/fsn wq rimary coil 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 h1 gmhcwjkt4 ;p*+qg6uas 60 turns on its primary coil and 300 turns on its secondauc* kg4h6qtp1 +m;g wjry coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primar;u glh0-pvg.qa.bt- hy coil and 300 turns on its secondary coil. If glatuh;gb-qp0v . .-h120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turnp d+7 /htdaifh+ljah(rm04)bs. If the input current at the primary is 100 A, we can expect the output current at the secondary to/+ a+ihm7 ard0) j f4hbl(hdpt 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 s;eo6gzgauq;uo9a 4v .econdary has 200 turns. If the input voltage to the primary is 100 V; ugz 4auo;o6.9eq vga, 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 turns and itsa-cf m:i0qtbu nl( 7rav7j6-f(e xky- secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to-b qmvuky at0x:f(li-7ja- (er7f 6nc be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The7o3d4eihfth(6wnkp 6r6 wte 0 voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of totalw6 46toienf0k3wh 7 t (rdp6he 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 currenoc/-i 3xh 5r9nuf5x eit at 120 V. The voltage is usually stepped up to 4500 V by a transformeo/xxce9 53i nir hfu-5r 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 curre7 s1ki5 dn)e6ucaas)xy-d 3dxnt at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted th a-ku6 a5)d1xci 7ex)yssdn 3drough 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 klml r 74(qw,,sveb o,long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost o kws4lmqlv,r(b 7,,eif 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 genpm: 7t/njoq 3.y/ dhyuerator prompn u :dqoj/.yt73 h/yduces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the 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 oq0w yq 8bj8s ea8cc):4kv;mro-hny -at 1000 V. How much less power would be lost if tsbjewr qyh -nvo ;o)0 k884mc8qy:c-ahe power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to btm6rdgz r:qf5, , ejk-e transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a d6g: 5 q-k,,rjrtfmzetransformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored i46cfn6e0tlpd 2 ,mkapn/9gnn n the coil's magnetic fielmn2np,0dcpf g/tkl a 9nn4e66d?

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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 18s-),v w+z x,f k x:hdmmdog/j1-H inductor. What is this circuit's tiosdxjmgvwm kfzd,-h,x : +)1/me constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuinzu(t +t-i pzup81c x+t 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-pho 6eic:mrf64 )+ fkpa uex0/V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 12cndplu +4 ,m2gse(ty,0-V AC outlet. What is the resistance of the lamp?4s l,y(tuc pdmn+e,2g

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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 qtq w. xls5 r5u7l5rj21 b:iopsupply. What is the peak current7 lbitlrqxu.w5 5qp5o 12jrs: through 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 9 yd;. cjshbe6is the power dissipated j hc;sy d.6eb9in 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 nstbj6rg,t 9 f1m .y)m50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W res90 nhyk9- ydbq i4qc.distor 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 resi+6kbz6)fuezqpf .- ua stor 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 4+ i0twqxpc+ pz id k2h)9u6mfat 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 2.53,qxa-amhja2ga 4x d.s p z(kj 7(dv.x0-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of p mfjfae5/x1k -q*g7ainductive 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 15/ ww023 wa y wmc-rj955xva*dghgpty /bqg7z/7 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH in-pp /o y6kau,lductor when 120 V AC at a frequency of 20 kHz is appl6akpy olup/-, ied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-Val o9)5pcepxu jq7km ,m3cb/;, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a ruw,9d j1hij 6 lgtaa;gv/f644.7-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 o*q4jja u2ko; ds/*d m4u6bxwat 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance ofq f txwwyup vg w6;gzc 2ej026w1+:pl cw/f6d5 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+/qgylu vn.p 9*wto6 q the capacitive reactance of a 0.010-mF capacitor be 100 W?w.pv69qqgo ltnuy *+/

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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 0.0n wxr2q 8 pefz-13ta3hs yb bx/ua/:0d010-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, m0axpdn:mip:7 gj ,( tzxg ;.r15.0 W inductive reactance, and 10.0mtr ,j igm:7.gx(z:;apdnx0p 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 resis ,xcv+ in dkaz/)8ic70nrur u 1+f-vwhtor, 20-mH coil, and 1.0-mF capacitor are connected i 1ui+nd +rr)k78u zc-wn f/ivc0ahx,vn series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mhri1b(r(is2j H coil, and 1.0-mF capacitor are connected in sirh (jb(1ir2series?

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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 conne 91u8uy gxznf 8by x 2otb+.jyqj()ky2bw0ht*cted in series with a 20-mH inductor, what is the impedance byybyy0joh*b 1x2n 8 2 utuxg9+qzj8 .fw)tk( 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 is connected in series with a 20-mH inducto gh*:kv ,v o8uw0cspy7r, what is the phase angle at ugwochs: 07 kv8,v*y p1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil angc4xqb ;+/ehf+:mr swd 1.0-mF capacibhg;r/ m+wqs+x: 4cef tor for a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances 1.cfmiq07k8r: bgu2a gdsf 7lis needed in series with a 100-W resistor and 15-mH coil to get a totalfg7drfl ik7 .ba8:smg q1u02c 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 inductp wop16mjc*c1or at 5000 Hz for a total impedance mpw1 j6p1o*c cof 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-n 8r 3nwzd8xo:kW resistor at 1.0-MHz for a total impeda:38dnwz ro8x nnce 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 capaco0 r4o7coowa,e:ya 4 titor. What is the impedany oo:a, 04caot7 4erowce at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 k 4pbgj10qpb5yt :tzdm,g v5d 2Hz for a totaldbtd y0, zq 5 gvt5b:gjp42p1m 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 a af 8nxfpb08 h1,zo)yr1 cx c2pphase angle oxx1)hffnp8z21a0cy,8r b cp 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 resistonlnxh(wuo0 +56/klgxa(3mny r at 1.0 kHz for a total impe 0g(l/ha3m+ny6kn (oxnwx5l udance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is the w- vr8)+mzj zodnq.*7p5oih:mu.hk vphasez.m+hvuznvo 7:- 5hdji)wr*om qp8k . 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 at 5.0 V and 1500 Hz if a 100-W resis40 2izf7mts bt h6v.jztor, 20-mH coil, and 1.0-mF capacitor are connected j7fm zv46tzts0 2bh i.in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor,,i,ty i w2)o*i(ujwc) z qwwd/ and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the ,/ i uz*qdjw(w,cowtyi)) wi2 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 reactance 30 W, and an induct vwo )6noqg2j)or of inductive reactance 30 W are connected no vw)2qgo6 )jin series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series w yfp(vj4, qsgo4 2k*kuk ;tdq5o//owje,tq0 RLC circuit containing a 50-W resistor, a 10-mF capacitor, a tww/ 4 uyq2k(jo,,pdq gojs/f 5vqk;0tkeo *4nd 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 phaslf5wgrw g1;u4:p4n rze angle of 4wgw1rp g rl ;4nfu5z:$40^{\circ}$ 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 xtp t gw0dl-4zd1fq7 8= 10.0 mF. At what frequency should the circuf gq084z7pl-w txdtd1 it be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance,- zoc79c(b (be 4flrhr 15.0 W inductive reactance, and 17c lc(fe-(b4orbh9zr 0.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of anftwy :f277f ug.0dpw-tvm q-n AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistancu zp n+,qha:; g3dcxk*e of 30 W. What is the power fact+,znpdaux hc:k;3*g qor?

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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 containieikvxe4kqc:w/;t) 6r1fq 8 xg ng a 50-W resistor, a 10-mF capacit;qq1x et)4v8 :crk6kfi/wgxeor, 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 frequency of rp o8j2ge j3*ba 1.0-mF capacitor and a 15-mH coil in series?oprb*je j82g3

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needenj:s+jm/z g)cr0 mk w4d in series with a 4.7-mF capacitor for a resonant frequsk +m /gjzjw0c) 4m:rnency 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 nee 9.qlv6pjrm8ybcme:1xj+u w9ded in series with a 3.7-mH inductor for a resonant frequency of 10bre:j jw 19m+x 8qpmvlc6yu. 900 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 resistor and a 40- 9akwc(:+wn(e9gvojr 37aoij wax s7; mH coil if the resonant frequency of the circe wwo 3ark9:n(j a(c; ov9x7iwas7gj+uit is to be 1000 Hz?

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