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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 magnetic flux5l9xfzl ax0nyt3. ,gh 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 ta+ q:* vpv)cd-u2ub eqhat 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 co) ccggd5v zl;fx1x /s*q3n:meil produces what kind of change on the inz:el *c;1nv g/5q gm)c fx3sxdduced $emf$, 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 loopd fq,-/t ndbw5 of wire produces what kind of chang wqf5d-t,n/dbe 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 kw7l :xlfs y0z tpa.ay1 (yz2.u-qo.gb ind of change on the inducey poa2lz y-(g.as7 lf:txb.w0y .qu1 zd $emf$, 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 frik9dvw9xq *f5da2,h l tt 61btom a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the cf pw2 1::smdzdirection of an induced current in a conductor will be that which tends to prodsm:w d12z:fpcuce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table1x gvkalv) *x8. A bar magnet is held above its center with its north pole pointing down. The8v)vgxal* kx1 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 jaj9tmdm+)(6/ rmd m,hxkj8 m magnet is held above its center with its north pole pointing down, and released. As it ap ,kdm6m8mj tj(+ h)9mx/ dmajrproaches 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 table top8mw-;j9 0 * ljy lnn:;bnq xuvf)n5imf in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When vi;f- wnvmfmluj 5*x90iyb:8qnnl ; n)j ewed 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 a region wnc8- mec2ewvmt*r9 (wj,zlc )here the magnetic field vector points straight up()jl ve c-mm8nc, c *9wztrwe2. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a regio m egu* +66f(h sgog:tz:i,ctvz1shz5n where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as theghm6vgo1z u ,c6 + 5ef:zgts(si*t h:z 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 anx* 6pf1b9( 4va 0qddztn3g zni ever-increasing current northwardxiq1v6g n*pzz4d( b9f0n3tda . 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 entering -m /e)qbw,m ft 0k1esnfirst. As the north pole enters the wire, the induced current will be (as viewed from abo ,)n10ew/mqeftbm s-kve)

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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 angu0k+ws5b kt(guxli7 9)xibd9q mu1:xxlar speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight dokbu99w :k(+ti 1 b xxsluxqig70 5dx)mwn, 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 r x,.rjnl6c/i9cs 2j2xt (jezw otated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what mustli n6x c(j wst/2jxer.z,2j c9 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.hpc gkf; ,veu7kp6(2r 8 +prjm
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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 ajx0ekx:)kj 06)es grb n $emf$ 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 mg-8y+ymk 6 xur,r ex25wfqup; agnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direct7 jedz,h)q,* e1h;ha*vpyk h gion) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the pot;ekhqh y1*)ahgh,,v pd7ze*jential 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 angulaw, *dmdms,j8d4e jp:o r 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+82srv- h (sxsiyjb(f transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates kzo6s/ bpr1yc)*mv. r through 60 revolutions each second. The frequency of ther .z)osymcb 6*pvr 1/k $emf$ is

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used t4hys: j 1,gbz7msglr0 o

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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 devic2tlbpe zg7h: kcy- -14emnu6*ldq +exe 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 secondary coil con etlx fhkb,) q py6.m2gj8z:g9tains more loops than the primary coil then it iy,bt:eqjmp 26xkzg f h)l 98g.s 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 prm v:nq6gerke7j0pzkc.h v) -5imary coil contains more loops than the secondary coil thengp ek-rehv0v67j cm5:q.nz)k 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 inpujd6c4ijjr3n0q xb6d u gma8e4l(v,-ot

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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 ci7uc7n vt1s* qyfl 6ln0rcuit,

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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 ceif) g, ot0+o xt-su*zonnected in series to an ideal battery of constant terminal voltage. Attstuo *fz+-xig0o, e ) 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 ac f/55m1kid aan ideal battery of constanac 15kdf /5amit terminal voltage. At the 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 resista i4var+cu+ j9d )kdu;gpzw *)knce 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 rq2s(xq8 +2*nyfp d ybmesistance 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 r-:ziow)svb 5 series to a battery. The time constant for the circuit represe5w- r ):sobvzints 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 inductor are connected in series to a battery. The battery is u- zi7fhtxw(yjke.w -p eh /ph)z-3,h suddenly removed from the circuit. The time constant for of the circuit represents the time required for the curkf,weh(-i.hw ) 7-t h-zx hp/ejz3yuprent 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 sameh5 s 9wuw:r:xny n*yo7 :;uft7zsgal1 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 powmzy 8*5gm-xjjv( kd 5her 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 supplymi e,7 3wyng6u. In this circuit, the curren3i6umen7gw ,yt

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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 jd,gg6 v+ td,iac circuit changes by what factor when the frequency is tripled?dggd v+j i,6,t

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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 acry*y03ammok t3emvb -ei)q7( ooss an inductor is doubled, the inductive reactance yoo3tmb7 (mk30veq may-e)*iof 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 apjqf *)i9;wjm vf4ysw)proaches zero, the inductive reactancjq)im; wsf)fv4w y9*j e of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supplykov)h.vd* sv t u ksiz*g4jy/gw052,75psqda. In this circuit, the curren*tpsh0vzqkyk 4o,557ga2i)g v v*jd ds. w/ ust

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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 whw690zupeejx *en the frequency is tr6 xe09z*epujwipled?

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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 approach xrlv 7dda(j):es zero, the capacitia(dv)j 7dl:r xve 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 b.v3,3ohcp qr hetween the voltages of the inductor and capacitor in a v 3hqc.pho3,r RLC series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defc2ib d49sq)ge ined 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 ink hk+3 ddr;*fdcreases. When is this statement trh3drf+*kdk;d ue?

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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 circuit increas 8uwos8spz)4ges 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 cir-kct5 n d2wt6p8c4v-+n)z ejkacz vr ,cuit 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 ::s bw)myzo wl 4vgoct *bof/n*s)yw(, 8 5yyethe capacitance both double in an LRC series circuit, the resonant frequency of thfzy( 4*8yoo5ncy*ytsw/ v:ob ewm b ))ls :gw,at 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 applietj,c: ee34zi* jeoii* d 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 seriesa yhvc1u- alu8816 if pxmt86g RLC circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radiu* f(b9:ln b r.5 ugtyngv99aajs 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux throj.n9na v5:fbab g*t 9(gu ly9rugh the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform/; sjngo;s j8mv*i+cqox oh;+ magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane osmo*ijc; /+;+o 8q vhsox;jn gf 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.v,r sq;q5coc*d u70i9a8v/ jrich5c z10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux throusu 9vric/758 h5cdvao,qi ;qz0rjcc *gh the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single l13n57bag m2ngk r8amqoop 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 coil chanmzl d3:jihei0xv:/. jges 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 wiuj2*az kg /*,v;oy gxw e7m+qlth sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find mkogl;q7vj ,uaz/yw*g* +e2x 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 tqn,ko 2n/:qqkurns 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 areaslb ,.-twoy v7 $0.20 \; m^{2}$ 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 c/pc.ri4f yy )location where the downward compon .c)c/p4iyry fent 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 long rotates at a const6uitl* q.l7p h z:vz-re vc0,o(un.d dant angular velocity of 2.0 rad/s about a vertic 7vuc,:dz erd n*iu.t0-6zoplql h.v(al 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 loops and a cross-sectivs 12 t:yuyvqwfpbrj)+ j5:)tonal 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 consistzlt hj k6),k)ah0b se: gym,i-7piuf .s of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular 4 xa,e7u/ z o+6p ;lmkfqj/mpvloops on its armature. 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 loop rotates in a uniform mag4/mk zp6;a/v qjfx, + opmleu7netic 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 c utcjy -h;34 fk:0yabhlwi*6of 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 generator withg ftc7jj8tn/3 an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil it g7ncjj3 t8f/s $100 \; cm^{2}$, 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 maximm/uu, (zonv(ium $emf$ 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 62xwht + wi ps1u/5gx0bbfmw ./.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 roxe/b9 x 4f kbm0:7dabesistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it genere 9:47o bd/maxbkxfb0 ates 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 resistancel6qy/a * -fuwr 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up current?q f6*/-ya ruwl

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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 ta( n m,uf+6xgq.msrsta,gvi(0lq l )8o a 24-V power supply. The operating current is siq+8 (m agu 6vsmn. lf,r,0(lgaq)t x1.0 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 rwr0d irnt1:5 lesistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0n:rwi05 tlrd1 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 n)xp( .pcmq zyd5xl 9 (4sezqw4eeded to 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 grwp ks3q4+0 a2vd5 pmrqehb s0fnv/ s/(5b8dprimary of a transformer causes 14 A to flow in the secondary. How many tur5rkwm3venf+ 4pbdh5s /vqsdbra800 gs( q/ p2ns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if the 2 gy pghgd n*ci;1gnas* qm47854-V secondary has 100 tg4achg71nqg *;i ms *pg85dny urns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secondary cm ; ;o qdxtrf;4un4te,oil. If the current in the secondary is 3.0 A, what is the c4ntx ;r4fut,q;o;md eurrent 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% efficienv4)vmxmz21 ms cy,zm vm12xv ms)4 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 transformer prou.8 mgmf(ljr, *iim g4vides 7500 V at 10.0 mA. The primary coil operates on 120 V. Whr.i,i (8 m4fmum*j glgat does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary cnv. 5lf)*jepczq (m k5oil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary)k*.q mfezl(5np c5v j, 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 tz j1tpai2 lnw*l * bnj;3ey,2kurns on its secondary coil. If 120 V at 2.0 A is applied to the e3jaj *i,nl n;2w kyt1*zbpl 2primary, 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 o 6la8f7dckyu+mp2 /b turns. If the input current at the primary is 100 A, we can expect the output current at the secondary top7 ua/kbm f6do8+cyl2 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 second6; qa d6 elbhzcvzki-ye-y:f yn f)-5,ary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the s hqe -e vfd)fbny; -z5:ki-yl c6y6z,aecondary 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 its secondawf 1hnwvv*a3 2eqit ke7y j/)9ry has 200 turns. If the power input to the primary is 100 W, *j wykw27etv)3/ ni1qaf9ev h 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 v6*xoa3kvbg :noltage is usually stepped up to 4500 V by a transformer and transmittkn x6b*vag: 3oed 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 Vbnp,dvk 8t *7n. The voltage is usually stepped up to 45k d,nv8t *nb7p00 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.

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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 120 V. The voltage is usually stepp/ 7nos sn.pd,i; gphb3ed up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the pepsh, n;g.obndi3 7sp /rcentage 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 jiqb)zwusqx1 )9e2vyv,jx p 9q k0;9flong 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 transformer w9iw)qfvz2)kqx ;pu,0qx y1jbj9 9sev ere 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 vxh)dx3o l,5p1n3bb n 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 perc)nn 5h3 od1x,bpbvxl3entage 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 mucwp k yeb7af.n+(4xj6hpd,xvm)3: xpkh less power would be lost if the power were transmitted at 3000 V instead ox bn,p: kdah .4wvxp f6ekj7 (xy+3)mpf 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 -j85vhib8mb r 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator ou-mrh588 jvib btput be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much enevn5a 9i4 gtiq2rgy is stored in the coil's 4v52ni9qgiat magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-9d. 4w 1nurz8glpu 0rlW resistor and an 18-H inductor. What is this circuit' n01w zu89lrprg l.4uds time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit 5ga9:m 9s64rszg)g rje)dk zhwhere 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 peakg2cyt cmk090j current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of th )z6 s0zwlwf6be laf b6)w6 wzzls0mp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. Whizr9 ok6lkb9fp, uc *+at is the peak current through the resistilupzkfk9* 6 +b,oc9ror?

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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 18erm34f k 4, tyad;jpq20-V ac power supply. What is the power dissipated in the resist ,tya4pk8 jrfm 4ed;3qor?

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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-*hlhe*o)of ) r8 vfv4wW 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 resis9w.pgzc,4)lm 3i qxuutor 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 50e/m+yq ekb6 x,wd i+r9-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inducte5qgmwie0 kgm ;a36y8m v*d -nor 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 reactanc8g8 ru1i:f ptgs unqh5 /3ra:be of a 2.50-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 -qe0hcex 2 lxr6lq28 phave 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 1000 Hjp2x csi: 0ac*z?

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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 --shr (nxbw2 bAC at a frequency of 20 kHz is applied to ib2-b-shx n (wrt?

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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 ;mh:ui t4vac 6pu72nta 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 a 4.7-mF capacitor at 10 k(c, p+kano9u*hvu ldv1u2sv9 Hz?

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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)7ghq0 hw3*gawt9kki 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 capacir l;okkfi*w31f*x ffnmd; y*tx : x/h.tor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be 10k(s 9ji+zn -rm0 W+ i-mnzk(sj9r ?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor a5*u,a 9ejmhcp8 kb qp8t 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 rescnzdt ,c5(o6a 9ate/r istance, 15.0 W inductive rent(ea zc9tda6 ,co5/r actance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, i u nd9/)qrg014ln ysx20-mH coil, and 1.0-mF)/ 1s9ydx4url qgn0in capacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase anglet.8+y.nb-d.m,ivmj u *enfwa at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor a e*y.b av.dnfi -,+mj 8mwu.ntre 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-mHy c: l1xr7m-ej4mo.yd inductor, what is the impedance at 1000 c :7 x-ry4e1ody.mjl mHz?

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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 with5o+d:h0g.of ;oqq apr a 20-mH inductor, what is the p .qo ophq 0odga5+f;r:hase angle 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 a 20-mH coil and 6/ pyshzr z2q9) usoa+1.0-mF capacitor for a toyr9o zqa+spsz26h/) utal 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 n.e):(ssk,j bvu4zcj8ony)s96v p nzs eeded in series with a 100-W resistor and 15-mH coil)4o (6.vzzj) pku9nyc jsbes :ss8,nv 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 il )zqvnjzgh i-xl,n/a3 ,mh6 u+)qzy,nductor at 5000 Hz for a total impedance of 400 zz) h+,nu6jq3l,yi/qnm g- zl xva,)h00 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 ate +3m6h( ezuh 2ww9fyq 1.0-MHz for a total imp( qf2mh hz 6w39ye+uewedance 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.c(exj*5 dtr zll0t x ky17h/8v What is the impedance at 1000 H tx/078eytr1 cl(xdkvl 5*jhzz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is need -zflw5df3,oa0 uepb+kzp7 x orju1f:7.+jf hed in series with a 10-mF capacitor at 1.0 kHz for a totad3.f7xo7h+uw:bajfp 0eof1k- przz+ j5u lf ,l 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 neededl.*yul .xep7h*xa 5ve2 wmi/r in series with a 10-mF capacitor at 1.0 kHz for a phase angle oflhi/5v*2mwxeuea .* lx7y.pr $40^{\circ}$?

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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 jhm;7bs be 7q,a 30-W resistor at 1.0 kHz for a total impshb,m;e 7bj q7edance 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-wyl 9k,rqvl ,g48vbi4pi f/2i mF capacitor at 120 Hz. What is the phas, wgbq944v/ fvikl8rpiyl i2,e 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 atoh* -.wre o9bt:60o cb2l bxwl 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF 2btr:e6lbwl9h 0bc ow-x*.oocapacitor 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 resistorwg) iwn/owswqg o*774s ka*q4, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supa/) q o47qkg*ws*w w4g 7wnosiply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an inq0o 4eiv*b*b9zmbl(,xn 5ln-s+ kb ktductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. Whnz *b-9b+q,*s elimn o5bk vxl4bk(0tat 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 segoz6 j9 8am c80gz2kcwries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supplakg802 9gz ojwmz 8cc6y?

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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 px 0ik 0,fr7km(6 tspnx (jg-i ol*mis9hase angle o, 7 0p06r*x(o(ifksg-nm ltijki9 xmsf $40^{\circ}$ 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- - ,eqx;slyaq mF. At what frequency should the circuit be drayl, --xe;q qsiven 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 lafu5 u4h ,zb.tgch r+ms;.(kcircuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactakz,u .ath4g. frm l+;hu5 cb(snce, 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 an AC circuintx26wt2 c h)jt 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 x06z :mm lbz1iof 60 W and a resistance of 30 W. What is thezim6 z1x:bm 0l power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a ser:q( ;eehl; qdaies RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductq( :; elh;qadeor, 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 resonantvo1 uzed0 wvm b*p- m.1jofa cq,xn4uh,or93+ frequency of a 1.0-mF capacitor and a 15-mH coil in series?a z.3 d uf9xm+pcvuor,nwjv4o , -e0*q1bh 1mo

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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 capacito)xwqdrv8)1ipgj*yv kq, q5 q 4r for a resonant frequency of 1 41 v8i*vqq,pjqr g)x)dwkyq50 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 ,9 9ywwcny,j.jml8t da 3.7-mH inductor for a resonant freque9l tj9djynym, 8 w,w.cncy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and t8oe2ii+. cxpt3s1neb(69+d cp fpcw a 40-mH coil if the resonant fr 6oiw 9(3 .c8+enfdi ce+cb 12ppxpttsequency of the circuit is to be 1000 Hz?

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