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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://autodiscover.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://autodiscover.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 mae b/+l-d-b ynrgnetic 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 inductionqe4; vtsv- jqpc29j7o states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of change on,4)b qx;ht5ls;nxnv mt n,v ;.cuiln: the i lm5 u,c.n nh;4tn,tvx:i ;lv;x)nqsbnduced $emf$, 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 xd7dzttp 22 3athe magnetic field through a loop of wire produces what kind of change on the indu z7p3x 22datdtced $emf$, 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 in8ivp lf,ms t7-duced78 -,ifpvl stm $emf$, 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;.dsmdvn i:ahosdo /s r ),8/i 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 induced current in a c)3rpzk3. ntx sp1 j adklfr;kb97q4z/onductor will be that which tends to produce whi q 9 srzjfp1kzanx4kk/33)tpb d;7l.rch 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 table. A bar magne6f+zm2okh (oozk n*n-t is held above its center with its north pole pointing down. The stationary magnet induces zzknh(okoo 2*6+-mn f(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 horizont kor umu 16r,xif 8jn5*d-+jcyal table. A bar magnet is held above its centx+c8uojki d1j * mr -nu5fy,6rer with its north pole pointing down, and released. 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 ta ukyx+ x;c v*6r7i 4srug+8s6izupio(ble top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, u+ruscvxpki66iiy4 r;7+ xz 8s*u o(gwhat 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 where the magneticfhue7;: 5 )a9ppot afqm, wd3c field vector points straight up. The magnetic field suddenly grows stronger. When viewed from ab)tpd ce5ma9, 7w3:;f uqfh apoove, 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 rf*qggs. npibbb)9 :2a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced cufb2s:rpg)*ng b.9b i qrrent in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal tabus7*0qfr)qa5 3jf/f l bg-yp3eimxcveu79 8n le and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewee xfn9a i*p7v7 u3-ujmce)385/qfl0rbsyf q g d 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 o;gj 3b2dg(ys2 d s6/;x7 ghajesu0twe j qll23f wire with the north pole entering first. As the north pole enters the wire, the induced current will g32ds7ldj 0 q/b6syjax jse; ;2glw gth3ue2(be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an a6 pz-loq ,7ozq;v ;urexis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axiole;;,rzqp7 zq ovu-6s 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 i; ac6t1xu n+y bbex)(b) ,atpspeed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight dot ce6 ty)bn x(pxb1,+);biaauwn, 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.8oao9szsro (p p+ n(-xdc7k;g
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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 td72 bdj. wku-rd0o:sshat 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 field. Tb0f2ff;,j b(ds dk7 lmhe $emf$ 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 movelvmeo,7 /x0p3k1ar1 kpcmdm ,d northward at constant velocity through a magnetic field that points straight down. Make a std ,3 kcemkm1/mp xlp7 o1arv,0atement 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 r p 3nr d:ojt*sx(nv7z+otates 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 transforms6r5nh. pz +ljp(9g svm

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The fr33bdg cv,pg:pazm*a i 2, -,a wnlnph2equency of t z:db,a a,l3nw,ipnpg gahpc 2vm2-3*he $emf$ 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 devi))8ltjk9 ajjsnf.mi zl t,-*0on(dvoce used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device ti.; hl,an(bi/ru7d5mma f8de hat

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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 ;+dsr-*e42nbg :, z rom su9gjdt0tczsecondary coil contains more loops than the primary coil then i,sbc2: g- zj4 *r0enz u9mddor;tt+ sgt 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 coilc ,r1fx 5z-b0bkuy5lc 0t oq.c contains more loops than the secondary coil then it is c,c-o.q ylt0b51cz0xf 5rbu ka

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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 inputabcg-cz5sg)mo a 1k1-

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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 resonantov:g) flxx ;l3 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 condf7 d +gzkx)mskfe.68nected in series to an ideal battery of constant terminal voltage. At the moment contact is made wigfkmsd+ x. 8e d76)zfkth the battery, the voltage across the resistor 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xxxxxxxxxx，获取更多资料
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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 an ideal battery o2 py9/sqgvainhzyvrk /og1-x/z;f 3 r v s/i5+f constant terminal voltage. At the moment ashkx; vv-vi/f/gn 9z/ r1 r/ypig q3s+y 2oz5contact 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 induc7 t*ryq 0nmd g(o.a3rutance 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 resistance R is connected to a kkxk5.d0j zm0n $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time *k6s-vd (swdat 2 nar/d5, 6 vwhxha7i3ovo*m constant for the circuit rewso k/3ds5t2 *a6ni-rvw6 a ,m(dvhh* 7dxv aopresents 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 sergtx0m541s gsmo0pp5l ies to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit repres mg0po5gptsl 5x104msents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units .wv84qzlu e/0 zwg3aans+/dhexcept:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, th g;0t 0g5 .pzfdj7spzkr jguw1zw4 2(ke 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. It1iex2yt1wc7(z2 g zlu;ac3h n this circuit, the current3wzaz2(1ilt7 hc1u2y ;extgc

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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 ch3 h cg(a;q2)ge.be nmhanges by what factor when the frequency .qegn2gm)h cheb3 a; (is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the 1 uxwwkya( 0p-inductive reactanc(k-w01upx wyae of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of t noa.xggq4h- lye0).mb.8wfd he AC voltage across an inductor approaches zero, the inductive.lgyamnw 4b.- f)oq.8 0gdhex reactance 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 supply. In this circuit, the 4to ngf0fx*o ;v:co2ecurrentf;0xn2ogco: ef v4*ot

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactanct8 /ybfx)cjbgfhkx + +6 y-s)ae in an ac circuit changes by what factor when the frequen/g fbxtc-+yfsja6+) )hy kxb8 cy is 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 ckd;pzeq(p-0f vq1 d/ fapacitor approaches zero, the capacitive reactance of that capacito1-e0vqkzp fd(;d fqp/r

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the vold4j:z(vfw24is )zxhe tages of the inductor and capacitor in a RLC series ciis(zd) 44zevw:j xh f2rcuit?

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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 i qfv- nwr(zqs: o2,jfzov*2a3s 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* vw6(xa 7zgrk impedance of the circuit increases if R increases. When is this statemer 6 (k7xzagvw*nt 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 c c6zkjjxavi4 1ptq: 6.ircuit 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 seri7,p,3x+ ojtph0lo yh hes circuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC c c8vy;iw afsp+d/y :z :v8pw8series circuit, the resonant frequency of that circuit willdz/cv ;vw8fsi +pc:w y8p a:y8

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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 drivenkp5wf.r3 ad 3v 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 ebrzm)2/kc *e j018igihrq m8occurs 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 fien,0rnd2 og o:2ig ro(eld of 0.20 T. Find the magnetic flux through the loop when e0ord2og i2:r(n ,gon 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 magnet wd,3r99p(g l3magp thic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the 9wa 9 3lprp,m(ghtg3d 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 rota -wj 0+ur5mf fb ;7g.4ib8mhp/olczgx9g un 8qting in a uniform magnetic field of 0.20 T. Find the magnetic flux throug/mc- 7hbub ul x8wf mr; 9g8n.gjfpi5+o0z q4gh 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 adjustablbywkqv 18n4m9yx4 g h/k(0 qome single 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 coila *ktf ety,ta4taxy 1634bkm8 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)a. o5w zpfd3fgj e/w :mjc8)s wire on a square frame with sides 18 cm. A uniform magnetic field is applied perj f:ow5w8 )fea) g/3djpscmz .pendicular 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 induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and a63wga5obir( x df8m ;ppc78nln 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 ancnc 1j20,ngnhd area $0.20 \; m^{2}$ 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 whh u*:izulx we4: 7yf.ing span of 60 m flies horizontally at a location where the downward component of t. fyu4 i*h:ulxweh:7zhe 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 constant angular vqx5tgz 2 f:5yeelocity of 2.0 rad/s about a vertical axis through one of ity ztg5qe: 5xf2s 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 generatoxyuwpn)+p duh3,mx +0r 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 x,,wa d:t24g .l f ymg8i:yqrqof 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 rectangular99f9b ea /eaz cix7i0x loops on its armature. Each loop is 12 cm long and 8 cm wide. The armaf0/ 9 aczii9axb7x9eeture 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 100wyi18p9doixd8) :y n) ymfd lnkpm36 px4 1xp- 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 generator 9f71 qcsq+iyw with an output of 12 V maximum when rotated at 60 Hz. A magnetic fiel y79+ qsfcwiq1d 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 withc;ha,z(u run3 3gh*dywz6*vj a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W.v8(-d, k9muw 4m jnmq2eiruc) The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor ovhiad-81n n s6perates on 12h 6siad-81v nn0 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 resistance 6.0 1wff3gr27 tuyrls o53W is connected to a 24-V power supply. The slr3 o7 tuyr 5fw3g1f2operating 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 connected to a 24-V power supply. uil0o/k k 1g 0fxvl3s0The operating current is 1.0 A at full speed. Wvl0f 1 s0u/k xio3klg0hat 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 resistancez-l 3 :e4ymk2vwqc2qo 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the 2 qye:lm3-qkwzc24 ovback $emf$ 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 voltagep4h ;cva7/fof 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 a)b/pdf(y ha1of a transformer causes 14 A to flow in the secondary. How many turns are(pfa/y da)hb1 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 necessarw;lgu bn83ff*y in a 110-V primary if the 24-V secondary has 100 gl3bwn ff;u*8turns?

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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 az a8 rq-utl )9tzw0zi;ce0k w9nd a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what ieu)8i-ct atw 9kq90lzw 0z;z rs 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 oodeny bl 4z.9bh12 2cuf a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondary 92n4.h12dcbze uyb ol?

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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 nk 2-5 xju9)f73zbcz i5agp0buhmyw e)eon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 9y057 ech zb5pak xb2)-f)zm 3iwujgu120 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 priig9 x*) uhb1obmary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is prh1bgu i*bxo9)esent 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 its secogs +-ern*h6 b iub6 i)e:(smecndary coil. If i:c* iu-h b) geme6sb6sre+n(120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer ham;ay ol03v cnf1bhf evl4l:( 0s 100 turns and its secondary has 200 turns. If the input current at the prim ofbl:0ayv;n3f41e0h ( lcl vmary is 100 A, we 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 1qr5 74nbmjrqs.w,grl i ),,fa00 turns and its secondary has 200 turns. If the input voltage to the primary is 1g,,j4nfqma,r75i.) qrswbl r 00 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns.r)oh lclatl ;*ny6ukr32 /gv6 If the power input to the primary is 100 W, we can expect the power output of the secondary to be (ne r6)goa*hl6 3ll;ukt/r 2cnvyglecting 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 usually st 3j 8n)eqlw q9vqbvfo/q 4py:4epped up to 4500 V by a transformer and 8pn qq vq 3l4oqv/4bfw9j):ye transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at( 1rvjgeo c*ld7z ix(6 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line o jzgv(e7*(6r icol1x df 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 oxoaq5gk3u) j+ f current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and tra3x+k5 gaujq o)nsmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a to m3a fp97.*frcq0btvz5w 6 tajtal 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 i59btj cm0f*z.wqt a7v3 afr6pf 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 longd1x dl6d(9-guu(* gtweboh 6 v 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. uog-( *bhdd(dl69 vuwe6 x1t gWhat percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V.4kz hb)kj ofmzv09 1/i How much less power would be lost if the power were transmitted at 3000 V instead of at 1 )kkb0i1 fv /jz4o9hzm000 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 transf:-vnxvvu+zx 1ob4-qir 81bg . l9k ktmitted 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 vx:n 8kl 1b gkq +fv49uotrb1z.-i-xv 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 curr.n3oyrzenv di m4)7udfq t+ 86ent of 5.0 A. How much energy is stored in the coil's magnetic ymuf in z7do3v8e4q).t dr n+6field?

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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. Whby .1ie 2x*y df24xnzjat is this ciejyn.*z xyxd2412 f bircuit'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 ACbf8 cv q7 at7axu-zm8.)l an,l circuit 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 r 46c:phg ns(5gy9 hy4xqltb6)h i+vooutlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC ouxt*m/lxb)jlh;8ozr , c y51bntlet. What is the resistance of the lax 8mh j y)*;bton5,1z/lclbrxmp?

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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 supplyd/:kk0l 6wx3e h2i9gn vw0mdd. What is the peak current throm6kded0whn:g k / d03i29l xwvugh the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the po4lu dh i(fhd:r5c7bv2uc 8 s;h,mxx7lwer dissipated in the resist,s47u8ldxmx2v brl7i5ch hu(h:c df; or?

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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 wqx9 x;m,u.gyg ax b7h(k iy.)50-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 resistor id . hdru/jn7i3s $I = 0.80 \sin (240 t)$. 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 resisi0 hb7*iqo6nrtor 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 1pcf0 .w)f k;kn.0-mH inductor 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 2.50-mH coil at+m.da+c z t 80usmm(. owmogm(+7ahim 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 k1ee *0jv+j+)d 1p pe xowuv8jreactance?

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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 i,73m 4 qjwi(,2xly x*viv pnbynductive 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 w;5wr0: vv zfpnhen 120 V AC at a frequency of 20 kHz is applf0v :;wz r5pvnied 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 throu:b8ihuhhhh +m 6d:q:ksfj ;z /gh a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance oi,z lt w0gl4qrn01 xg;f a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is need 1 7pj,+xovdvdcm x11ied to have 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 capacitor have w3tpl /s jm3qg.b --;cljyg8 za 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 capacitor1e;6mx85pssqsk7xjz uz 9j 6p be 100 Wx8s usjsz7 x9 zkmejpp5 6q6;1?

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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 throug 9sajci.bs.b5h a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an acb3o ; m)jn - 7tjy g7m4ba0+rgm/bsqkv series circuit with 12.0 W resistance, 15.0 W inductiv7gbk) qbsm0y t/ jbngvro+-7j;m3 am4e 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 Hr8sk s(b bvp24z if a 100-W resistor, 20-mH coil, and 1.0-mF c 8bk r(psbs2v4apacitor 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 an3o;jt elj)0z1o:gvg fgle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriest;j 0fl v:3 egg1)zjoo?

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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 inductor7auyxgnc+9 vxm;j(l ;u4uw2q , what is the impedance at(2uv7ux;uly wcn 94aq;m +xj g 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 seriek5ys82at3ut;(qfxd/ d696r bntzo m gs with a 20-mH inductor, what is the ph6 xt z2a3t /o98rdg6yq 5kms;n(bftduase 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 serictt 70*lid v9 g(jd,wn4wjz y+es circuit with a 20-mH coil and 1.0-mF capacitor for 49i*w+(zl7tg0jdcy, dwv n jta 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 in seo pw dmjb*0qh;l:8;q eries with a 100-W resistor and 15whb:;ple 0oqjdm;*q 8-mH coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH indqdv*f 64b16z2 ykgrm iuctor at 5000 Hz for a total impedance gy kb6fdi*4m2zvrq6 1of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz fort4)7cp4h5wkr6re qxu a total impedance of 1 tc4e4uxw67p )qhr5 rk50 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 seg kpamejk6e6+4u y.q8ries with a 20-mF capacitor. What is the impedance at 1000 epymau. k8+6j64k geqHz?

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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 kHz for jc,n+/ t3 .q yoj(gvbpa total impedanc 3g,vjq+n/ .p yjto(bce of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a ph+s;whgi98 q4d (gbfex ase a dx(g9 gfhse qiw8b4+;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 rf*)y tg:u jq;lesistor at 1.0 kHz for a total impeda yqf;:t )*guljnce of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor atwrw56 bju/ ;at 120 Hz. What is the phase angle?w /w ;5rj6buta

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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 xmem/x7a7yaa lu0:)( lgg* hz Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in s0)m:u/7xhg* a gllmx zeaa7 (yeries?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit8 zo6spziu:98nq jzsx 17 jdk*w,h(sm consists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?sw *kp98jqsx( z6z 7u:h osm8,ijdn1z

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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 capacie. zt3scv8f 9, rnn:witive reactance 30 W, and an inductor of inductive reacf9z 8sv. ,nwne3tic:rtance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit contain)mgnrikcg /tir: .)x: n(pr )ping a 50-W resistor, a 10-mF cap. :) prcri i:ggr(n) mnp)kt/xacitor, and 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 necessaryh9mo*;sq+gdu mf6 sl8 in series with a 500-W resistor for a phase angle of ug+o6hm*9 d s8fq;sml$40^{\circ}$ 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 h42lvqrtde* 6oas R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have lrdo2etq v64* 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 anq 5b)ahc*u+ucdnvo :3+4d aqu ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when th+auq o)c*3v5u4ch qdu +da nb:e 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 AChz7 -ry*tt;x x n5,hou 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 84qqvs7p m vq/2 a:eehand a resistance of 30 W. What is the power fve /sa28q vq4h:em pq7actor?

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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 contair83yq0f+sp apyyry, guq ;v)7 ning a 50-W resistor, a 10-mF capacitor, and a 0.45-H igy;yq r0 ,y8apr)u3pq s+fy7vnductor, 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 in sepx- 7zv5a dur5ries?uvx755arzd p-

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a z q)5 h/k9xug 0z.nukkwmp7gh1+ c r(bresonant frequency of 10 kzkh x5 m0/ +91kqcur n.ph)zbugk7gw (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 for a resc/ advo4 6ns 5ct*ngz,onant frequency of 1000a,g*c ov csnd tnz456/ Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-mH pm xrp2.6 jp2kcoil if the resonant frequency of the circuit is to be 1000 p xp.22rp kj6mHz?

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