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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 magnet4or5n5veu b7 :wkd2ccic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that k;+r,(a:lrg h6j+ih pv f4j hmm1c.r othe $emf$ induced in a loop of wire is proportional to

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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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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 co6u t ja0 9ohaqkuhh10:il produces what kind of change on the in6 ohhh0 au u01:ajqk9tduced $emf$, 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 thto7p ;o33 0jky 2aszhbrough a loop of wire produces what kind of change on the indu72b3z ; spajot kh03oyced $emf$, 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 om,5 0l 1ht4up4jlbrwhrs8 if (n the inducedp jlhhir1mbwr ,8sl(4 ftu450 $emf$, 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 jjti 0:u,*jbv55 h-g( qs npjhfrom 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 direction of an induc i*4op(abt /rred current in a conductor will be that which tends to produce which of the following effei/*p o(tr4br acts?

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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 table. A bar magnet is b+ q/wyrgce (etn :-(4d)wvetheld above its center with its north pole pointing down. The statb rwevw4c+tqy de:(- /)e(tgn ionary 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 ak7vie */+rknp horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the fallipvn i*re+kk 7/ng 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-mko m p+(w1( shw(apk8iwrt:sj0pf 8 in a region where the magnetic field vector points straight up. The magnetic field vanishes sukw (k8 1hw(jsmart-wpmo8p+sf( p0 i :ddenly. 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 lsr:9dk,(c cbk7 f kmru9y)7w oevel table top in 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 curreo (d979)r7uc:skmyk brk,cfw nt 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 xsqluu3powwy-1 .s3ezr, s;4 b 17ycywhere the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current inyyro. ,zce s1p4q7 wyw u3su-x1; bsl3 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 horizont9gv tk0p,ed+rmn o -9gal 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 induced ceogm n k,099-v+ rdtpgurrent 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 loo:f7twde; nt3 up of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed from abovetd3; 7 :untewf)

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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 anguly 1qlzuu zf8nr8n4bm s( m6f9+ar speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the oryr (6 4u981f8bq +mszzlnn mfuientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed oyvb kqaxyf.v2 g(2;:about an axis whose dir :;ky(2vo2byaqf x.vg ection can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if 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.- n*tmtm v3ok :cic.9/gduonm -.s 1yr73srly
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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 bu:(txnhbx -t,0tm8n an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic fiducwxf4erq/,, y dum3i 41ka6eld. 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 p2/0wh:mbbi10 oycpz oqe(; fdirection) is moved northward at constant vfp2 :i00c (qobehzypmb1w/;oelocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rot+yy:de5r/v: 5is lyec ates at a constant 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 transfeekq,u ,hva* g62)2c qmfux be3,cz0 dorms

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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 rouxk0 *f3afj.n0d s-each second. The frequency of theao00.* -sf kdru3 jfxn $emf$ 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 d gky9a;) hhmnyd--*g sevice used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a devic))wwe 4w)nck- l 1xmlwe 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 j/ zv 920hcdw7vmrr3kcontains more loops than the primary coil then i2vw 7 mchrkr3dj 0/vz9t 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 prim::uv4*nvhcm)o;jni7+b vpj*u ujm,eary coil contains more loops than the secondary coil then ivojmvjnvju +:4 7i)b;e nc,*:muu*hpt 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 pow:z0 a.sckr0k hwui-fo4p gr41 er 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 resonantmtkj* hepao0 .g.1)tkx czl+5kesj3( circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal batteb6hzi4:b9xv k (j 5lvmry of constant terminal voltage. At the moment mhv(vb l6:945zjk xbi 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 seriesk pbqbq(ss,isb)q. c 4i g+s30s13zug to an ideal battery of constant terminal voltage. At the moment cobkqbsubi scp+z3i40gsq q, (.)1 3sgsntact is made with the battery, the voltage across the inductor 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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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 Rr kbw/ t:+ 027oqyxblk 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 andw ybh,4fmo* mds)nd8v rje 0)l/g *b9b 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 cons( w j0 vme83ii2rmpu:nected in series to a battery. The time constant for the circuit represents the time required for the current to repm(8wirm2v:j 03 seiuach

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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 b 51xvms4zwv* aattery is suddenly removed from the circuit. The time constant for of the circuit represents the time requxzw *vsa 541vmired for the current to decrease to

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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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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same unkwk az1tr +*w4its 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 powgl--x ss6(a,z knjy.zer 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 supptbo5i7: a25m k bfcho;qdz 0o0ly. In this circuit, the current70h0 oa:mib;bt k 2fd5qc 5zoo

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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 what factor when t+ sw6r4eac sf-oyv5i 3he frequency 4 +5ficavewr- 3ssyo6is 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 vola ab vq7v9ery77qh 6s:tage across an inductor is doubled, the inductive reactance of that indub7:v 9a7q 6hra veyqs7ctor

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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 zero, thmwxc cik u(6h(0hgi h 7ob)9t,e inductive reakco)h cmihh(x(79 bg0t i wu6,ctance 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 pcar)d2xqw- o-ower supply. In this circuit, the currer ac-qd 2)-xwont

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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 z/(k4 (;h emy ls5xjjlwhen the frequency 5((hlye/jj4 z kmsl; xis tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zgl szi*g3sv5 8 h 9c+la5sf.ej+y:y stboa,( fero, the capacitive reactance of that caef5jf o8g,3lg.sa lsybt (zh*:ss i+yv95+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 t45elj0, 2bwvhh4 ed rlhe voltages of the inductor and capacitor in a RLC series circuit vh l520wj e4rle4,bhd?

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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 3++h qfrkbbm0za4 (c*bcl+mx53s viean RLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circunfi rais/-/5 e5umpw4 it increases if R increases. When is this statement triw5mei/ - u/4 rs5anpfue?

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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 iyc5vj)gjg,(8enqt:ql. duc3. xnwq1mpedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit i; u6lhgc 4wifd;8emf-ncreases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in fxz0)kp5)t( y4mo))zi x eppa an LRC series circuit, the resonant frequef t)xzix)pk4e() amopz) 5p0y ncy 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 drivenxlj c:ax ;rx1bl,- qo2 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 occuc h hip0rc0k pa..hgi b)0:rm/rs 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 unifvjg 8xg aduk2;63 aet)orm magnetic field of 0.20 T. da2j6ukx )3t;ea 8vgg 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 rotating in a uniform magnetic field 3m*,fhjw qnp:of 0.20 T. Find the magnetic flux through thjwp3*:q,fn m he loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform m.fcyghl01,r g0 cix 1dagnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop .10ycglh ci0,1r fdgxand 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 sin1t:6m,yqk rn se*/kcigle 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 coil chang tg(jjv4;.i*9x7x v :xha xwkhes 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 tur m4/ni vqgf(w 3he8v,tns of wire on a square frame with 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 the average value of the 8vi4v nq/g3,thwemf (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 3gr2rnwocdzvsaa ll50.v7- -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 area4kqv)18byy y o $0.20 \; m^{2}$ 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 sp* *c 2 mm:n;r5agy.z2wnrg slman of 60 m flies horizontally at a location where the downward component olsy wzn.ra2*g crmm2 ; *mn:5gf 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 l: d/bv9i6qb lba,m: i :n1qkgzf-+ 1dzytmdo 4ong rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of6i az9zk:moq +v 4m1bg,nt/l:ydddqbfb1i:- 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-sectional arenlf9u3-pmj *k a 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 o2w n r)i um,dnp,/g.kyf 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 loo5mx4ea h hbpf bd-i*/bps9 ,f;6w rdf8ps on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotaw ms b bd-6;ff5ihedb r8hpf9p, a*/4xtes 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 1o v h8ahc8e 2pp3k0)-o zv7pmg00 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 simple AC generawo*+5q +ipjrzpsyki -3ew .z5 tor with an output of 12 V maximum when rot* o.ey5z+p3 irskww-zp+ij q5 ated 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 vhu9+q w8q odaa.ct5vp9)k1e $emf$ 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 resistanvg2;+9em hms,l h up, zplk8s8ce of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor x +yhk5x;g;wohave a resistance of 6.00 W. The motor operates on 120 V AC, and when running at ful5ykg;ow;+ h xxl speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. (m(i p6 ,rrh v-vc9(ktaqz5n j The operh(a ,qzp i (rvn9tmv6r5c-k(jating current is 1.0 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 connectet5b7dps. q/m n,9frhhk0y kh4 d to a 24-V power supply. The operating current is 1.0 A at full sknp,rd4m . y htqfk 5b/shh709peed. 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 to a 24-V power supply. Th/qg75n gzkjp /e operating current is 1.0 A at full speed. Wh5 7/qg/jgpzkn at is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary v88jwq oo9bt4.jmbf.sywf(9eoltage 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 pric/4m+gn .l(/xs (:dutezsobs gclz 5, mary of a transformer causes 14 A to flow in the secondary. How many tur/(u/( xgtcmeln gls 5dc4.zs:b+,os zns 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 necermx.r0xakc *wn:1*v lg .lu 22pym3hassary in a 110-V primary if the 24-V second3v* ahkruwc.a0*rl2 g1ln ymx2.px:mary 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 antis-3g ,r 9drn)um9. vjygt1dd a 2000-turn secondary coil. If the current in the secondary is .9 rr1js3tydgtd vg,m 9ni)u-3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 1w)t 0;0 4h fr8wksvvvo00% efficiency, how maf)4v0kvr to8 hw;ws0vny 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 transforme ru25p-uw 6k4 ufuo*nir provides 7500 V at 10.0 mA. The primary coil operat-o526 uunw u*kfp4uires on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary a;u/mf** apgt)2hjev coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the seconh/2pga*vfa ;e u *mtj)dary?

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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 andlmsxr., uq y6u6 dmuf 0(,l+f-* uxfdp 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in myu- sd*6,ux+ (f6lxup.df u ,q0lrf mthe 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 igsx-3 ;t-c0 kwx*kbaz ts secondary has 200 turns. If the input current at the primary is 100 A, wet3x0ax bk w-gs z-c;k* 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 ha9ba e hfdfms8qaq*f/rt9m9g5 8vkp5f8x t8o-s 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the outp8sdh5mgx*5afab9k 8 opqvm9/ e tf988ftqr - fut 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 transformh/c(cjh9o z)x e/a5hger has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the po/hhcjao(ghexz c) 5 9/wer 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 jlfkn2 fjn .:i2lq 81sx;k e6bt8m9gj120 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. Find the number of turns in the sklbgjn62q:1j8mik9n s. 8x je;tflf 2 econdary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. Thez (9s0 hdq5wx*nii q5l voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission lin9xl5z*0sqnhii5w q (de.

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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. The5 u-r5u;g msa;dhglh7prn*5 j voltage is usually stepped up to 4500 V by a transformer and transmitted thn5drspr7g- jhhl;5 ;*a 5ugumrough 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 long has avn+esi gzs wh ;/z3b;7ag oz94 total resistance of 0.60 W. A generator produces 100 sg9ez3oh;v n+ziwa;g7zsb 4/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 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 rn)ic7ma9 6 uy*ej;jqzy3.n shas 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 is losn6e3i q*9yay jrns.m) z;ju 7ct when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power5ff 4tehc9 p.r :,n4ds*szy zr would be lost if the power were transmitted at 3000 V in4n*sst5 fzrz.de fchryp4 ,:9 stead 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 generat4 :az*uh:ctuhwa*(u yor is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.0 h*4u t u:z:(wya*auhc10% 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 stog 5ax6r8p56in wefk1z7zig- cred in the coil's 81 ickgrf 5 eip6nxzzw a576-gmagnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. What is ti/ss74hjniz./ x. tcf v*rqj 5his */x4q /nfhs5 iv tj7c.. srizjcircuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC ci* ul1xcgoo3z8azm m nv6r,4a4rcuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC *x am3 g(f7 7w-lunlipoutlet. 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 placf;p,,q s 3q2glys26lwql2usvte )x f;ed into a 120-V AC outlet. What is the resistance of the lamp ,sf;3yvg llxqp6,ts) luseq 22 2;fqw?

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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 1ilb/6tte/m 7k 20-V ac power supply. What is the peak current through the e/ltk i 67/btmresistor?

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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 connectedsv0w5)cr 8jvx to a 120-V ac power supply. What is the power dissiwrj)5vs xv 08cpated in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-Ws(e3df1t3 5z hhil,fs 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;wjmmy .u2gb.3rng jvj7d3 o 3-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistot8k9jru 9p 4dir 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 in8:m(c 6rx8tl;mlyely(yf3 j qkj ;9yz ductor 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 2nd l9ph,yg1 nf: a2h;r.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 have 14.0 W of inductive dzghhdb;15t 6 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 reactanc izq5y8k;*vtji u t-v7e 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 db hn/895koy w120 V AC at a frequency of 20 kHz is applied to it?/ndwokb59h y8

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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-V,j )t0oymvht, yz c. u+1 w)ix7hkmoue9h96dk3 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 95+8y rk9hgjxxm(f ;xupc 3y q10 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 haved*1p.qg; zi*p 6hk hfa 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capa*fv5pj 3iu9m 3s voh1wcitor 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 reacruug7*/ ezyp 4rhcu 56tance of a 0.010-mF capacitor be 100 W?g*yr 6c7upueru h 5z/4

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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 at 1000 Hz an/3p3 g alpp;jmpb-) dzd 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 wittr;) wu*jay l7h 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive rea;jwl a u7tyr*)ctance?

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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 Hjcu51k j (c) v v;-grak0m6j5l svx*mpz if a 100-W resistor, 20-mH coil, and 1.0-mF capv*v 5k l-c5avru s0xj)mjgkc;m 1(6 jpacitor 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 angle at 1500 Hz if a 100-W resistor, 20-mH coil, oo nw;( g jpyto.6ui5g)q)-tkg nm(8nh:h(zeand 1.0-mF capacitor are connectetuk to) .gn5no(:;w yjg(ig6h )p z8nqm(-oehd in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what i 4gz7d n8ttkt;.k 3cmzjbv0s;s the impedance at t4tk0 kcjzm n.szg ;38;btdv7 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 inductor, what is tqng;m 78*v bomhe phase angle at 1000 H87v*qg; mb mnoz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF canic.zt 0oxw.51wiig6pacitor for a total impedant. o5 6iwx.z10cniw igce 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 in serd gde34t 6xy1hies with a 100-W resistor and 15-mH coil to 3x6 y1h4tedgdget 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 serljs ooso o,zq+ q00 ofp0;v08fies with a 450-mH inductor at 5000 Hz for a total impedance oo + 00jlqo0soo 8qzosfv0;,pff 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 q nf1.5yyfv4 5dvm yxwl )d 5*5h.ovtbbe put in series with a 100-kW resistor at 1.0-MHz for a total impedance of 150 kW?. mqyy dfvxh51 dwybl 5n*vf 4).5vt5o

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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 connp1i.l f0jd2pgga8q6-h6y 0 *nwti nipected in series with a 20-mF capacitor. What is the impedance1lq- ppji 0 p6*hg.208wni6tnad ig yf 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 ksld1 9d+oi la9Hz for a total impedd91odi+9l s alance 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 1von,z .bmf.l/ .0 kHz for a phase an .fzl, omb./nvgle 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 *e3e c.40ohkhk z6,w db6fo)sir/xlm-W resistor at 1.0 kHz for a total impe)s0/6ho3frkwi h6d.,e oclm b zkex*4dance 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 1 +pvu-8utelm 500-mF capacitor at 120 Hz. What is the phase ang upme8v-+lut5 le?

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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 ,ph g7se*alv6ca+b a7e 7noi*1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capa,ce h7g*sno 7+ *pbiva la76eacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacito4s8 4mdt-nsp br, and a 0.350-H ins4st- 4 mdnbp8ductor. The circuit is connected to a 120-V, 60-Hz power supply. 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 capacitorl mmgat248d5q zfpb,rhz/. -j of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in sera.b q 2-p5d4r zm/fzgljm,h 8ties 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 RLC cir+yg5x1yg5ji v2,flpxexv*, qcuit containing a 50-W resistor, a 10-mF capacitor, andy2g+vv e,x,jgp yq*5 xifl15x 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-W1wjea vx8v78j resistor for a phase angle o88v vaw 71jejxf $40^{\circ}$ 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 su/u6h kvm +yh:13xqifa. axdnk 0d 8/mF. At what frequency should the circuit be driven in order to have maximum power transferred fromma kdd+ h0i6f /3qa:1 yn/xku. vhsx8u 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 ouh .clnz-ps 05ntput in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circunn- l5 s0zpc.hit 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 m9+(sb 5 7hjsicg0sdjow x b0 -zw1t/oy37dhvAC 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 w u:q1o0vpq)t and a resistance of 30 W. What is the power factw0 oq:utp 1qv)or?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing ijoyuzf.dk1*cp;ji 8g :,z *ea 50-W resistor, a 10-mF capacitoryd*e kiz zgop ;:i*8uc.f1j, j, 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 r*cxe/ n3ewr(a 1.0-mF capacitor and a 15-mH coil in series?cw(nrex e*/ 3r

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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 cay9 g)x0yq+dwn 4d6zw g u.ks+j7z/c vqpacitor for a resonant frequency of 10 kx6d/ qygjn9yvcz7+qs g w0zd w.k4 )+uHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is nekgr :xm9d6 pga -b:w7k+ll ;qgeded in series with a 3.7-mH inductor for a resonant frequency ofk:pq;klbgd gl:6w r7-+am g9x 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 30-2:q 4wxrchad -W resistor and a 40-mH coil if the resonant f2-hw4x d:arcqrequency of the circuit is to be 1000 Hz?

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