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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 unics*r;: rwpunjh.s:m 8ts 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 inducvy,ves9, szl; tion 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 produces8)odt zwt3t2m what kind of change on the inductt3 m8)odzw2ted $emf$, 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 produceq g gnt34rkdt sxl0+ +dfqjr5+we5n8 efi3 38gs what kindn3+ lwd 4g38kgrq 8e+ft50i fr5nejs dgq3+tx 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 wire produces what kind of change on the indu,sklby .xg 04rc.0sybrklg ,x 4ed $emf$, 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 h5c4 aycycy,x jb: es4+x66khfield 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 an ind -)e* tyqy;r)e4gnkw juced current in a conductor will be thw; yyrje-) kt*gn4)qe at which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizo17chao9e 2omj eau16 mqsy01cntal table. A bar magnet is held above its center with its north pole1me1yo9 a02c 7 a16smo jcqueh pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is hec ato0 /9o7nocld above its center with its north pole pointing down, and releaa0ot79o /c oncsed. As it approaches the 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 tab h.ovwa 6f,(k( ytqq;ele top in a region where the magnetic field vector points straight up. The ma 6yqa(fq w.ke(;ht,v ognetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in+un v5 ov.1(gyrg-qib a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the fiel+1bv ggu5v.-o ynriq (d 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 g ge)3k z/2eryin a region where the magnetic field points straight down. The magnetic field disappears suddenly. W y2)ze/e 3rkgghen 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 horizon cra.l (7ris3mtal 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 inducedr( cm3lr.a s7i 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 northeh4g8wom rv8-z dk,7or 1zd gr7y1k7 k pole entering first. As the north pole enters the wire, the induced current will be (wgd7 rrv78d1o rzeo7gzk- km41 khy ,8as 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 odht(-e5 wrc) lf2q- n76ukid an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the lql n-o)uh7 dret(-56f2kdw cioop'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 rotltyfj8 n3wc ub lz6xa4 hqp1;5r e)8d7ated at constant angular speed about an axis whose direction can be va76b8 a8qu1h;rtn lz) c4j yp3lf 5xdweried. 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.7 8p0 4alfomol
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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 an 9+k tglyux5)1yqs 0ug $emf$ 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. . jaf 3 fqt1kbi(rt)ko: q(pr+7upl8c The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northward 9f(taeu*g9a a at constant velocity through a magnetic field that points straight down. Make a statement cfa(9au agt *e9oncerning 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 ce,v hxsroxkrp46 rg )077gc* donstant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transuz0(cryx mj) 2forms

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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 r(qo8ob *fafa 8jl s 8zz;is/e7evolutions each second. The frequency of th 87z;8saz (lqofoib/as *fj8ee $emf$ 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 torx)pqp c,4( ll

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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 dj aefsjb8gk*3 vdo 9f; pu e8bv)..ah;evice that

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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 secpdzh+3u :+m(ccrrs + jsdgp:4ondary coil contains more loops than the primary coilcp+r+z:dmd(js p:+3uhc4r gs 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 c:g,bb ml.tl(f 1y s*eqontains more loops than the secondary coil then : 1.(qtb*g ml,byslef 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 inpbs38(6:muy cuhngk0but

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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 circuit,-6 ja9xjeufg 2

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal b0:g lg(i8trsb z:vgz)attery of constantt8il:g(gz0sbg r: ) zv terminal voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to anzcb61)7rhgxd h6qkz 5 ideal battery of constant terminal voltage. At the moment contact is made with tz kgh1rqh z6bc7dx) 56he 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 inductan6jf 3zv a c9co9*6 (iruc4jif1ll8zfzce L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistnnleki3 r3ka4joq )qmh8g/c5 )a4* fuance 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 indu+b ersol0p4* uctor are connected in series to a battery. The time constant for the circuit represents the time required for the currs*o e+0uplrb4 ent to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The battwtd 49laux(me9bs . fxj( y5.nery is suddenly removed from the circuit. The time co ej4.l. s5tm(aw (n99ubdxyxfnstant 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 haveyjs b -z3fr,,7up;ho b the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connecte8td8als+2 ep cd to an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, thd8ey/i /uq9 z0ux0 sxejjl4.ae currenq/zdxusxi 9y400ueaj./ l j8 et

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by whatxay3 xf/nlx j;+p7*c gbnn+2n factor when the frequency cn+;fl7bn *g23x/xjnxp n+ya 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 inductoro 4cbalj +rolqndx y7 q819:yi *k,o-h is doubled, the inductive reactance of 1ly* ioocb, hkxj4 q a-798ydo:rl+qnthat 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 vol ;q knvizmshm8.;i,5jtage across an inductor approaches zero, the inductive reactance of that coiz; 5h ;.ksiqmn,jmiv 8l

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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 a5p+79fuo o9; rq j keul1qv2zon AC power supply. In this circuit, the curre rlojo2v9+z f7 qqku95;oe up1nt

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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 chani as;+way+mg w /m+9yqges by what factor when the frequency w+aqgys /++m;yaim9 wis 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 f 7+h/l0r-w(zuvznc uqlm)d -the AC voltage across a capacitor approaches zero, the capacitive reactance m0h7- (w+duf-rz)zvn ucll /qof 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 ang xnilh/n 5 b10qe.am,2bmf bd)le between the voltages of the inductor and capacitor in a RLC series circuii5lxe1b dh, /0m)m a2bb fnqn.t?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit 1wtz z6wycp95 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 -n( jcf,jsvz1hr;v0a impedance of the circuit increases if R increases. When is this state( jzj 0srcv nafh,;-v1ment true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the cir75r ;6gcx.obi :tonv lcuit 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+i+cx0:w6svqguw u :b 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 capa)gkom6, *sqe ccitance both double in an LRC series circuit, the r)c osgeq*6, mkesonant frequency 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 t7p 1wipnut+: ohat 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 circuit occursykoytm1t +1vicc: 8a; when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fieli 2:*n 5qelhdyd of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fy*d2 :ehqli5n ield 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 uniform magnetic fq l etr7g(b h)qk1sp;py*sl/ 3ield of 0.20 T. 7e*stl)p lq1 rgqksy;/3 h(b pFind the 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 radk;4l .a+bhct ee. ulrtww /)n( m+x4fdius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector ar cu/; m4t(r4w w .la++l ke.nhdt)fxbee 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() d.nli eo)g6yok w0t loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a c y39p0vgppl4g .b (e0n0ho ljw *r xz;aytc/2coil changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cm.n pwudx7m**4b xtq(p1j7 :znh A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of th 7p(nm4db:wxtp j1xqh* z7nu*e 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 */ azpxyh.mx ;;8hf gland 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 area wuv -ai(t*adf 6p7bs)s( p wgm/sa)j8$0.20 \; m^{2}$ 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 horizontallcz;: eo xr(5(yubvk u;7jc8od y at a location where the downward component of th 8jcxe(;ryk 7ozv(bc: uo;5ude 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 mng 4/x:ws x:dd long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through: :4d/dsnwxxg 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 generatoz 4u8sbfgik-*nxs+5us 0cw5 wr has 50 loops 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 wire3e0oou.kk7hnoy* :u j*tsl,t 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 2,4kz0xw ihu dhy:e3b rectangular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armatureh i3:xuw, 4ehdkb z0y2 rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will 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 aremqa4vm yyz) (:r r- yydwx1g;:a $0.090 \; m^{2}$ 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 wi(( y*tpt)ffmg+ s-i gbth an output of 12 V maximum when rotated(mgfpg*y - +f itb)s(t 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 pfl8rllr 24w3$emf$ 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.h vog7z3x4u id;k5dk 800 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 yho7hw)a h6o9 ea) nt5of 6.00 W. The motor operates on 125 oha yn6h)ao7e )tw9h0 V AC, and when running 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 resctgd2-4nl fwj 3 iu6f,istance 6.0 W is connected to a 24-V power supply. The operating current is 1.0f 4gf3wn2tj ci 6-du,l A. What is the 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 con7 g.x1eyp9we bu7owr,nected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the bac17,.w e97rpg x webyouk $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to / z h/d7tmxsq12alvp65sv7ixa 24-V power supply. The operating current is 1.0 A at full speed. What is the bah5 dmls 1/sz xxp26t/7v vaq7ick $emf$ 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 primary volta4.5 0gte l mnlbcf;lr,c60fd 3 7jwtntge 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 wufx*j z +c.o x2--3stxk9zqg(j:hhjof a transformer causes 14 A to flow in the secondary. How many turns are in the secondary -t2o:ckxqjh-jfuzhxg*s (.+ j3xwz9?

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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 the 2q wn +3c9/mk1/db 6d3 ylbvijh4-V secondary hlwm9b3 1q+6h/ikdyvn/j3bd c as 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 seco kwn /0,tf:kgl q;c/axndary coil. If the current in the secondary is 3.0;talqc /:k,0 gkxw n/f A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% efficiena;b+7ltv )qa ecy, how manybl+ 7v)aet;qa 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 at 10.0 at,q)dkim-g4p51wwwv fj/ 7 umA. The primary coil operates on 120 V. What does the prim)w1g a,q wf twvi5umd4jp7k -/ary 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 cok67xrn9g r 7diil and 300 turns on its secondary coil. If 120 V at 67 r7g9dk nxri2.0 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 primary coil and 300 turns on 2* jg gszu sk)m. kv0-o-fhtg6its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secoogk62h-jmg*gf0z t svs. u)k-ndary?

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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 :beve t :b:7 u7z6kvhf100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we :6v zkvhufte:b b77 e:can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 0f ylbv zf:)wmumq;c- v+;gn+turns. If the input voltage to the primary is 100 V, we can expect the output voltage of 0lu- fvm)cmgw +vnb:q;fz ; 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 transformer has 100 turns and itw wf7k.h/wj*zvs7f. mjxojrat :k 0b*h3.m1 js secondary has 200 turns. If the power input to the 7hbs j* .kwzk7.j hxjom:f .*a 0/wmf3 1wjvrtprimary is 100 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 60 A of current at 120 V. The voltage is usj:g;wa t9hav ;ually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in thgj;twv:a;ha 9e 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 Vm xly5 7tv: ipyl,*mue o3*s4hl3/cjz. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power lin pyxloljyvl3,: uimc*4/e sm7t5zh3 *e 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 6vq:l;( n9o8zyywq7 chy v/ vu;0 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 resistance 1.0 W.quvv9wc y; ov y8(yq:;ln/h z7 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 ld;6.fb 7dc6rydp t3pzine 50 km 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 if the transforme6.fd y3d; czd7 pr6bptr 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 k4ws;yaddbqx,uc(ct kg;5 0r ( 7tzsz.qj31qam 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 thc.sqzz, (qkwbrgx10c atsu3(;d yd7q;j54tae 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 z b,tt;y4o, qbat 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead z,bby 4qtt;,oof 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 transmi(f(gpdscoa(k; ii. ( otted 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 ig;oip( kdf(o s(ca(. 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 s -z2(g 7fc .yqvr d5-hs4kdpyof 5.0 A. How much energy is stored in the coilry s5 7h -dd42pqzkyv. (sfc-g'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.poe +)jml3d 6ws *gna a 6.0-W resistor and an 18-H inductor. What is this circuit's timees63dn*g p. )lm ja+wo 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 circuit w 48dxne;uuu t j86x:b 5o4xytthere 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 peak curren-3zhr n9dqja3 d8ssy: t?

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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. - ppetgna*70+ztsf r-What is the resistance of the lamp?p- +*a zftrsgt 7-p0en

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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 connect db+ iq6 xwrxn6aq5(c8ed to a 120-V ac power supply. What is the peak current through the r5dnq i(6qa68xx rwc+ besistor?

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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 a-vl .;rthdy (bizn*(qc power supply. What is the power dissipated in qb n(.hvt(zri *;- dylthe 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 5bm3gr:n : wnrl7i*zw u1zo)e10-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( e )yt3 rkwc eg9fr+wt q6g3mp5 tb6/lwb,p(k 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 resistor -b;h-wxie wy fcc,(bdxk j6 (1is $I = 0.80 \sin (240 t)$. 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 inducfa y1nuhxv9 e; dt5l4/tor 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 2.50nn-lm,i1/k qhnj p( i0 jj.u0c-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 inductr,akj 1k02c7m n jc/do0*vlubive 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 necessar-k,,bvkx889xa dv as-u rc:thy for 157 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 inductor when 120 V AC at a frequk3 a- uy/5rvmeency of 20 kHz is applied- 5vyu3arek/m 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 -lnetz4 3z0hiju( w(4bn4hck due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of ardzakg5q+axh22o, 6 q 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 50vnu7(ej-4g j h9 v03f gifzx5q e+ic)v 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 reactance of ,l el *ypqi)4d1200 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 capa8/(wrpbugjl++owg7 4;j sjmocitive reactance of a 0.010-mF capacitor be 100 W? 4o8+o(gls/jww;j j bgum+pr7

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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 capau m:w g 4 )0vfk:yfplwte/m7*acitor 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 u8 u 2hxqk;9fycircuit with 12.0 W resistance, 15.0 W inductiv29 8u yhkuq;fxe reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resist igr 0rjohsw47rfp*xs prt)rg-.092 tor, 20-mH coil, and 1.0-mF capacitor are connected if t27 rg9-x jt0 )p*0igspwrs.rr4h orn 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-mH coil, and 1..9u(1xdsboz /afhz 9b; pk-n b0-mF capacitor are connectez.; f9onzab -bh xk1/du (bsp9d 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 2g c00d5bh,rlizdql319 j cr8x0-mH inductor, what is the illr q 3hx5z0dcjcr,0 9ig 8db1mpedance 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 induwre(n1osh2 -o n :vpvlaw(* :mctor, what is the phase angl:vnrnh:mso-ww e* (o2ap1 l(ve at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with 9d1rp d k(iz6(j we+aea 20-mH coil and 1.0-mF capacikedz +( eiwjp9r1(d 6ator for a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed ing;22:*mh 8orqy *kijqehsmf5 series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000m2 ;fs8o*2ij gmyhe*qh:q5kr 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 5000 Hz fomuyz 0ig5y *pz 4d3vk:i4n9v ar a total impedance of 40000amn 9v3*z d:k ivipu5y4y4zg0 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0z, 74 luugtqqhj0-rp g; it/3b-MHz for a total impedance z3th;glqiup,7j /-r0gqt 4bu 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 capacitor.iw wh v* 3w w,udia.abok,8h.. What is the impedance at 1aiwwka. ibw.*hw,, d .h8v3ou000 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 c2 +xre m++dtarnz.9b 4wxd j9tzjz g3:apacitor at 1.0 kHz for a total impedance zxjtd.g x mzen:trd9293b+4a+ zrwj+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 a0;x;kw a:y fost 1.0 kHz for a phase ak;ws 0xfayo :;ngle 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 kHz for a tovl2o)+ aphv 2y-i9fd qtal impedance of 45poi) hqy d +v-2f2av9l 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 seriesb ve+u9iahcdq /ks1eh.fj3u m /4k .j, with a 100-mF capacitor at 120 Hz. What is the phahe jue4,sh/. a9ifb 1jm ck+uvk.qd/3se 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-Wsdoq7-cugar ho (3 7gkug2bt: q9ol; . resistor, 20-mH coil, and 1.0-mF capacitor are connected in series (-qa7golgqgdc7o2o ktb u9r.:uh s;3 ?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, and a 0 6 8r1 7oyfsaxorj7k1q.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the cirfo x1k7j8 7srora q61ycuit?

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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 reactannc)(w )jzj 7woce 30 W, and an inductor of inductive reactance 30 W are connected in ser)(w7 ozjjn)wc ies 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 s*n m xvdl1 kui-ct,,i)eries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz ,mt, u)kcn*-xd 1ii vlpower 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 nece f*ato1a4+s(;x k ouuhssary in series with a 500-W resistor for a phase angle of u; 4oxu+ kft(h 1soaa*$40^{\circ}$ 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 wh7gvi umm.g asgcs/2 ah88-0n qpoiq3:at frequency should the circuit be driven in order to have maximum powe.cgs37/hmgvinau0-mg :82q q8posa ir 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 anw w. n0bajv+pe;.wj.7az r)jo ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power sup)zwb. j0.ar .7p+wov;wajjneply?

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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/6v4b vmlc(q4c,/h x cvjnyd 7 AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. Whatae5*8rgbn)5g xp o m,s is the pogr,g ) *xsb an5e85mpower 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 serie.7 rw pmeu(qo99f*y0f cx.nhls RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inducte oqumlfw9px 7c( .h 9nr*0yf.or, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil iu9/ em( +l 9:nie7js)dfomidl n series?( mi9ed/mso7nil+j l:d 9uf)e

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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 iq lf pagri,*96ppig 3lm,6n/wn series with a 4.7-mF capacitor for a resonant frequency of 10 k6,rw3 9gn/qp gll p6,pimfi a*Hz?

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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 folbg 8:e) qhec13vjyl37tkh0o au 1mu* r a resonant frequency ofqtug11le cu *0j 83bayhhv ke73) o:ml 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 resisq1c-pc6jg 3t84fcl jutlt;; vtor and a 40-mH coil if the resonant frevtg-tcc; qjl8 41tc;plj3fu 6 quency of the circuit is to be 1000 Hz?

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