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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 80 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；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。本试卷的直接作答链接 https://51fly.win/test80.html
 作者: physics    总分: 142分  得分: _____________

答题人: 匿名未登录  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 fdwtym 6f xui9vx3+*,9im3eaylux 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 9 u- msz7fvn/othe $emf$ 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 ot5(e akbzw6 4 q/9gtxvf loops of wire in a coil produces what kind of change on the iextk9ba(/ tq6 wz 5v4gnduced $emf$, 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 pjbsa v* :i*n-of the magnetic field through a loop of wire produces what kind of change on the pa*vb :-nj*isinduced $emf$, 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 prow 6t: tefmvy h(7z6vv/duces what kind of change on the induced /v (6tezht6:w7m vfyv$emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a mu1m6aif)hn j(jt7 :nsagnetic 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 cur bnhp)*q cw;a+rent in a conductor will be that which tends to produce which of the following effects? *q+bawn;hc)p

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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 is9c y 9k(+se*tju co: rajxq. a nf-3x7,m*enux held above its center with its north pole pointing down. The stationary m9 sxcmkn ,qa.*+(ox:*ynuerfjutj e x9 73ca-agnet 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 umy: q+,+kgg6b0tgrh bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnetug qbytr60k:g+,+h gm 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 tableggmn :p:vrb:. top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current ibnp.vrmg: g ::n 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 t.cug.b t8 bay1ts0kv6he magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the indyus8a 0gtbct .b61kv.uced 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 ad: x obzm mc 8*;kjdygz;*e46s horizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from abovz dbz4jo:csd y;m;8mgx*ke *6e, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal tablmjol( )w.e9;2oeuy 8n/idtple and carries an ever-increasing current northward. Two colm;l 8)d/(jo 2oiynt .eep w9uils 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 en bii51w(qumks9(848elc l bzptering first. As the north pole enters the wire, the induced cik(9 1pq4(5z b88lue wismb clurrent will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whoseg+/rfycb0vy; direction can be varied. In a/vy cybfrg+; 0 region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire i7d4trotr ym)5-8mn chw zq )i+s rotated at constant angular speed about an axis whose direction can+r)trz iy-dn)oct47 hq58mm w 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.5k6t+lq pnw :kw h+hurdiu969
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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(wo kpp pd (yvnzfo087u /g0n9w09h 5t1pmlft 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 magneti/ 15gpu fp-itj mxi/. xwt7, iczuld/5c 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 direction) is moved northward9yd:dky 33f ku at constant velocity through a magnetic field that points straight down. Make a statement concerni33kky:du9dfy ng the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constv ytqq 01yvc68xh2a 7jant 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 transwjf4sm0sgp i 4-t+ lu kh/:l/lforms

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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. Than 8mqwc5c(k ,(rf:gie frequency of thcfmq8ng(cra:5(w ik, e $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device usednv-kf 8l pp1e ed:93ui dz-z3b 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 dbz8; rbm)x,g+1.eaophe ms*/m:3j z ira ksb*evice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the seconddlmc/ cchx90e9. ai rqoe/n62i1xwnd)i 9h;pary coil contains more loops than the primary coil then it is i de/whpco.9 qcce /x9n29rm)xi6nhd0li a1; a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than3(*hmryr8 ovtk-t q7k the secondary coilrt-* ho tkkmrv387q y( then 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, th3bvj z)6uy 5ale power input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant ci 7+r;vjnei l -/udo)vl9zo5chrcuit,

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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 s9exq*iar9 n+ geries to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistor iserx+ i9g*9nq a

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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 connec3a uptsnf1.y d/v5 sll5kx5-h ted in series to an ideal battery of constant terminal voltage. At the moment contact is made with l.t1xvp5ln fkuds5-3 h a/ys 5the 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 wiq;r7up sb grmg5jo, 8)th inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the 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:n0x0rj ;ncftt qcz h*v33nu+ L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connectt/ rq4qv( go4ved in series to a battery. The time constant for the circuit represents the time required for the curqv(g4 r qovt/4rent 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 pv/g)x 2k-nq9eh,yxr are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the cirnp-/,9grxxqke y)h2 v cuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the saj22t tw6 auw2rfs3sq 1me 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 power supply. On)k1nl0 n,)pi3h*pjsu ln0ioy 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 ane;f ydy0qh (v+p30zxt AC power supply. In this circuit, the currenx3z f;hev +(d00y tqpyt

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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 the freoi / 68ov7fav3j;4th xbo /6faek* gxbquency is triplefib;o4 7oat k/ xavj6v8*ge6/3hfxbod?

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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,zxc)ijfsx(+z c++n/s lusi- ,fnlz8 s)b ko5, the inductive reactance of +)ixk/nlz+ z+ js b,fcxfz(o sn)cs8,i sl5u-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 a; g3aq1ucgjo/qh 7sk 6cross an inductor approaches zero, the inductive reactance gug1oh7 jqsck/ 63a; qof 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 connesoa)7 26 nzsw+au t.5eadu1vzcted to an AC power supply. In this circuit, the currentna asatdoseu2) z7+v 61w5.uz

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when the frequl ttq7frt;) n.ency is tripled?.)trf7qltn;t

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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 approacheiibj o34ipt-l w0y,2b s zero, the capacitive reactanjb,olw0t 4i3 -i2iypb ce of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capaci) u,;w/joaayj tor in a RLC series circuijoj)wy; a a/u,t?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit i(k6aok y +azgyp *)8grs defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increaksd3mg of.v /lq;y9 gvg,6:sases if R increases. o3d gakgg /v s;:yvfq.ms9l,6 When is this statement 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 circuit increases if u5lhm.7m0d ogv52jbv ky+ls ;$X_L$ 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. 2qp:yl 0 wqyq/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 serie3m njih sg0w- 3z)k67r baoc6ws circuit, the resonant frequency of that c3 okczw s6wm)gj67rihbn3 -a0ircuit 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 applicoc4ce -yo;4 8xv*qe ved 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 occurs whp.qmgc+13 jb( ng b8iben

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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 0.10x(bcgco3 4bve ieu87) m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the m7bxbe8v) ci3 g4c oue(agnetic 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 radir7am.(*ak(u 4f u;2xn tixgg kl1 2ipous 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicularr. kk1l 7g2p;ua* mtii(2g( axn4ufox.

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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 magnetizq t699hfro - ddip278rab mv2c field of 0.20 T. Find the magne 9h-2pd 7rb avqo 8i6dm9rtzf2tic flux through 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 u6xyfx) :k xa2*ic jz,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 c,re/,e1 igw (hdg wxa+hanges 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 withzoqw5;/ : )vzp7 erxf.xlz.vw 200 turns 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, fvvqz; zz /7xepo)lxw .r5f.:wind 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 turns1k 0, t2il*qpa n7wlnd 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 a ;u )g,ffa(iulrea $0.20 \; m^{2}$ 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 location wherefe2 e/ eb-mv6s the downward component of the Earth's magnetic field ibef/ e msv26-es $6.0 \times 10^{-5} \; T$. 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 d b.k :kpmn0actb8r212.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field of 2b8r mta:.b01ndkcpk$5.0 \times 10^{-5} \; T$. 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-sea8gcn:aai p laa51a7h9 w-ztq o 9-yx(ctional 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 tub bv yu.rl4)x+xwu-oz 4p( 2mhrns 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 l if+ l i65lzg+(5bzscn yr-vg- -xla:boops 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 magnetic field of 0.30 T, which is perpendicular to the axic lfbg+6sialzln-yg x- (:+i5-r vbz5s of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of arg 4wf7f aj/ub:ea $0.090 \; m^{2}$ 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 constrg-+nl m6l8 lqiuct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.0 86i+lll- gnqm50 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 wi8uzsk bywk)g, )1au5qth 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 resikw cy( jcrd/:8stance 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 have a res5 -uj) ykwnc;8clly 8jistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it gj l ly-wcy 85kcn)ju8;enerates 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 14a 6biq.olebgt9g4v power supply. The operating g4b it.6 gea obqv91l4current 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 po vp9jnr(7.ppnp s0ge;wer supply. The operating current pvgp7(j nn.;90sppe r is 1.0 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 resistance 6.0 W is connected to a 24-V power suppq,-cfyds7i wbyw :/h2-ot 4rs ly. The operating current is 1.0 A as 2:sw /-7q4 ,fy-wh cdirtyobt full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary vocs/d/lrf ;j:id e0ap,/6 shqoltage 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 of a transformer causes 14 A to fl ypq1t,8ekqa: ow in the secondary. How many turns are in the secondarp, q te8ky1:qay?

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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 11/q(hk //gse lr0-V primary if the 24-V secondary has 100 turnhrg/ kse//ql (s?

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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 s l 0v+3m2b7 ksxrvss,recondary coil. If the current in the secondary is 3.0 A, what is the 2ms+sx30 vrbsr klv 7,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. Ass.m deb9n);f9 jmuo:q tuming 100% efficiency, how many amps at 24 V can fl ubjf :e9;m9d.m)qntoow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V ltzyp4a v.5v; at 10.0 mA. The primary coil operates on 120 V. What does the primary 4 lp5z.v;tvya 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 coil and 300 turns gmx)qssea 12v+3ee;22hhaj won its secondary qj1)h+s2m2 2heeaaxv3sg ;w ecoil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 6040,zwglu, f oc turns on its primary coil and 300 turns on its secondary coil4cozguw 0,l ,f. If 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 has 100 turns and its secondary has 200 0nkg33d yy4fnl kj1j2e88g xaturns. If the input current at the primary is 100 A, we can expect thend3j1 gfn2 30l4y8ak8e kjyxg output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 tur gj+dt6qg35u 6dm3 bfyns and its secondary has 200 turns. If the input voltau d6+ 5g dbmjyqtf3g36ge to the primary is 100 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 1t zdxuj8/ymara 6 mnz,)v/uke- ;+(x w00 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecmy ;)a/x6e- uz adjw(x8tzk/v,+ nrum ting 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 i- wm t+f5*hbmgs usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. *mhw+- 5mfbgt 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 cur,mm0 p4wwpfo+fmnf/jw.u 8g. rent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percenp.wm,4wum+g f8/nf0 m. fpj owtage 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 vv*vq4 s,afm9j+r hy -roltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage4 ayr,r- +hq jvvm9sf* 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 ttv c pcek((;3wotal 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 trapc( c;(v3 etkwnsformer 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 5 vu0r 8:tr(fz rreb;m/0 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is loru8z;m(: bretfr0/v rst 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 azwdw pj1 p *)flw*n:bpc*. 2idt 1000 V. How much less power would be lost if the power were transmitted at 301wp wfd*ipdpcz).*: jn bw*l200 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is t.y0//x5gob j/rc xv wg.)bzfno 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 excee yg 0 cf/x)bg/o v.5xzbw/j.nrd 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in the coilg cfxh,o/m ) p- 1puhpyhw4.s3's magnetighc3h mfp/y4 p-1w)x.shuo , pc 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 rq +r6kfp8 ,cwwesistor and an 18-H inductor. What is this circuit's 8w+rcw6f pqk, 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 where the rms voltage is 120 Vrka4,zg4v l* u?

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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 1ll+*o ,*6n erkkkgqm(8zbbzsx ( ;5h t20-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is thh4og+jy) gcj1) .fp qle resistance of the lampol.qj g)jgh ) 4cp1fy+?

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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 wu/vap9 nr:pvil 18e/mva4 g7 power supply. What is the peak current through1i7vw ga8p/vu/np49a m:l rve 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 aqab y7p54uxsv */ zur: 120-V ac power supply. What is the power dissipated in the resistor/r q uyxs*pv 4uz:a7b5?

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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-W resij) sj;0uisky-stor 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 isl()z2e+wazw /3n xs s/toif3s $I = 0.80 \sin (240 t)$. 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 rnj,jlw/iw bk -k *h2cie,*wz) esistor 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-gpt/6hcf2uy os25 -jlh.dkpzw1ow8 ,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 u q)mh ma.. jns0k)ys(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 coildh-i6w05oz4 by4iir1 *x4dmwkqpmt n (.;b ij have 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 n-n8tep /b(k+ u:hdfbp ecessary for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductozwr n7v,ie p;6r when 120 V AC at a frequency of 20 kHz is appl,6i;wenr z7vp ied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil duenl+e.87j(bv1 mgk x 3rg 35rs6zvokm r 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 capacitiv vc vrl61o n)vt mmf1pa-c5u1+e reactance of 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 needed to have 50 W ofnw,tsax8)3 3 + khnvmh capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 1674e kchq2;e-z efedn200 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 rn2q,b*g ad9 zfeactance of a 0.010-mF capacitor be 100 Wad z,qfbg 9*2n?

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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 andj tjdlg / uj9t:l*,,h7aoal y( 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 3 y5z v1quf7)m(oce n hov jstf*+4v;tseries circuit with 12.0 W resistance, 15.0 W inductive reactance, and 1yt;e zou5 *1vvf (j4n+somqh )c7f3vt0.0 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, 20-mH co+-y xy6f pvj1lil, and 1.0-x +-6v ypylfj1mF 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 anz74see 9 9.rc; azfhujy:.exf by4 1mcgle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serief.uz9 49h:c 1;efeymbs jcr7.4y a xezs?

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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 serie.c)rdt9*4h yajh 9tgl s with a 20-mH inductor, what is the impedance at 1000 jarlg.)9tch9t 4yh d*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 resistorpgx9z- sp95qqe tsq,4gk)0n f is connected in series with a 20-mH inductor, what is the phase angle at 1000 Hzq)9,qkze pp4fsg-t90 xg 5sqn?

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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 tu)992bqqd rwcvs8yj** ( ebca series circuit with a 20-mH coil and 1.0-mF capacitor fodb9q*2 q uwsb*cye c)vtjr8(9 r a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the followic3 h3z. vf6q ssx3 csp6h,ikf0ng capacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W atci .60f ,s3 h63xzhscvkpqs3f 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 sert j bj7vj.g vn85.qz9oies with a 450-mH inductor at 5000 Hz for a total impedance oo.g7.j bjnv9 tq5zj 8vf 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 s ftqegzj 3s0 /mgeft p.2g3+8jeries with a 100-kW resistor at 1.0-MHz for a total impedanq0mzs3 3f8gfj/pg.t2egj+te ce 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 cae+-zi( :/yi )v mubmcgpacitor. What is the impedance +ue)mgvby/izi- m( c: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 withklkx ayos9( 54qzo3a3.mg+y p a 10-mF capacitor at 1.0 kHz for a total impedance of 45 9(.k5k myazxoy lp3s q 3ao+g4W?

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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 serie0 0d8mb( .q1 ldvbanhfs with a 10-mF capacitor at 1.0 kHz for a phase anmab(d80bnv0h d1l qf .gle 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 rb v6u;s;bgx4 hkxy u6.esistor at 1.0 kHz for a total impedance of xsb6gx; . ;u6b vyu4hk45 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 capacit 9rq r xwg+ t pa2-nzo(e90r0*rtbbo+uor at 120 Hz. What is the phase angle?9np+ror- r 2+qw* 0t(ua0bb oezrt x9g

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-m u f:nu 4yaxwn 7,t(3dq3c:aqbH coil, and 1.0-mF capacitor are connected :baauw:c 3( ntdqfy3,qx 47un 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 res*sug1(odkes cn9( n9 uistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What isnu gu1 k9* conde9s((s 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 rysi:o-3 sd:/q lh3 gccapacitor of capacitive reactance 30 W, and an inductor of 33 -:dsy:is/lrcgo qhinductive reactance 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 containing agvmpn9w3 -q px s5r:f) 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60p5m9gn 3pxrf-) : qvws-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 ngv 2isq:cs+sc-s(m c .ecessary in series with a 500-W resistor for a phase angle of :(sm scc vc2g+.sis-q $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequef op;k475q-s1 8y l33tfdz fzgvjng z3ncy should the circuit be driven in kjz;-sv y7z35gfn33 qdf g8zo4 1lpftorder 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 +, 113v3jvx 8i2+esrwsu enmpkgc3li series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is cow2 1ivcn ++ ligpke1xj 3ve3r ,s38msunnected 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 circui :er;hh-2g jqlt 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 imwd ,ia:*g8ux1va hmd0pedance of 60 W and a resistance of 30 W. What is the power fha*: 01dvwxu g,amd8 iactor?

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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 ci*j 1/spg -of/sm evv,-a ugl7rrcuit containing a 50-W resistor, a 10-mF capacitor, and ag,-fv o j em/g-71pv/as u*lsr 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 a 1.0-mF capacitor and a 15-mH coil in sel-8*9c wb*quhiqgppi j2h7g 7ries?7cighl89qp q h 7*2*-gjbwip u

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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 40kun3u7rn) s e;c+ng x.7-mF capacitor for a resonant frequency ofxk+g 0 unc n3e7nr;s)u 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in se+h/r:bkm;*gor a t d/dries with a 3.7-mH inductor for a resonant frequency of 100/ d/ b+rh*:mtgdor;ak 0 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 7lxme(1q1i(mf1 hbct dtq 3z;with a 30-W resistor and a 40-mH coil if the resonant frequency of tmdmt11 e ;lzx h3bf(c7q( iq1the circuit is to be 1000 Hz?

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