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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 followings8mjf 9xht6m 8.mqoh- are units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction statvrgg:w 0(p m5yes 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 chalg0dli7 i5jpn5 c :y1t4ix8) sqoq+hange on the ii g :qh sc85n ia01tiyql5xpl7+do)j4nduced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wirmm*9a5eilq7+l: a f kye produces what kind of changka:m*9 7y q5lef+i lame on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop ywh egtvs,1,z u::qtm* 5o9biof wire produces what kind of change on the indu5gsu t,1b :hqv i,tewm9: oy*zced $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic fii. y n)cr6t c6fu+3oq +j(e5ire cg5waeld 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 curre z h:t/1 vw8u-ji b3 zh+k1lb2*vuj+ a(evcuncnt in a conductor will be that which tends to produce* i1auvvhnz: -/+ebt38lcc +vwuk2bu h(zj1j which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is hytxlgd4.. pi py*qt;itgb. o8* .x6i seld above its center with its north pole pointing down. The stationary magnet i;.dgpbgylt*s48ii.q.xp ytx6i*o t . nduces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet kh (3ve)-kl mnweq shg,(..osis held above its center with its north pole pointing down, and released. hw oe.-)v.,ks3(hk( lsm qegn 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 table top in a region where the magneticxb cdu.0wq 0qw*3d jr4nv,,ua2em edp:1d/th field vector points straight up. The magnetic field vanpb4ddw3t* 0mer: 1/vx w.d0 uq, dh,uaqcen2 jishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic fie gc4au o54g2mmld vector points straight up. The magnetic field suddenly grows m 4maug ocg542stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizont x2g45cusbi1l 2 yrasjx32l:nal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, wgrl5ixsusx4b 2:la12 ny 23 cjhat 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 tabl osdek19qak3* e 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 1adk* 9s 3ekqoabove, 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 thro,mbesw4 ,rv4 hh/qvg,ugh a loop of wire with the north pole entering first. As the north pole enters the wire, the induced current wilh/v4r 4v,,hswe qg,bm l 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 co1m18r65zole bnb2 lbxnstant angular speed about an axis whose direction can be varied. In 5r n26zme8 l1bb1lbxoa 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 is rotated at constant angular speed about a(.4m s i, +q2goyomciaqnke ,;n axis whose directioa 4n2mgyk ,; ,o(qm qisoci+e.n 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.j 0/r;vjqg 5ki
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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 uiq (b;y j6yo3uthu *84+oqdfthat 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 0j0xfa;qd0jcutax)9q8l i fi))1 z gq xxk5t8a magnetic 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 (irbz (sug (x0the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acrossbrx ig(( 0(zus 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 rotateekr .u; 4/oxgvs 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 tran , 2zm;3xwiwejsforms

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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 e u)0vavk4 vsakc) i2qdei6eez/9),zqach second. The frequency of theuv402a)9ise, iv z ze )kade6qvk)c q/ $emf$ 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 deviddg 97jjfj9 n-ce 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 thanb80dauq gn.41e kns1t

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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 contains more loops than the p. )tlkakr)0yurimary coil then ut.a k0)ryl k)it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than thky oj8) n43wzne secondary coil thenk38zj)o4n wy n it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inpgh6)2tt;82 xh1xcrml t :tc liut

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circuit,cex 2t)l xs 6d.p*et;g

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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 connec uocrpew -6as0+xhwb)nucw56 d* dy 71i6vo q8ted in series to an ideal battery of constant terminal voltage. At the moment contact is made withv6q+w s6dn-c b ye dxwwu*o )oac5r8 6phi0u17 the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series 39.b rsuxbmq/to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage .sx/qm 9rub3bacross the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connn;f.gzgg5ax /ected 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 induct-c g*qc14dyucg zt +pafxl u0w5h307k ance 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 connected in series to a battery. The time cono9o;ny;ldg . ;slqpl. stant . ;ol9dyso;l n gqp;.lfor the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series thv)(, v+ygt,p wyki-to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the ti h ,,vwt-vgyti)p+k (yme 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 excefg :zh.*ks- .3q)e8m gs jcrhppt:

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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. 0go-zo. uusau z8m 4:+ps m)siOn this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this j50fg+j1n.7b baft kuwx 17wo circuit, the curren j+nofw. j57kftu g x7aw1b10bt

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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 cln ws8h/3t(lb7qh/ stircuit changes by what factor when the frequen(blh t/ lqs7tw nhs8/3cy 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 d9 7 sj,h 8i8pl)jhwbjtoubled, the inductive reactance of bh h8lt8 7i,jpjsw)j9 that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches z zk zxbkq6;u28ero, the inductive re;62qxbz8zukk actance 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,y cv1nf,:8pe)smj -it the currents8t)i m:epyj-fcn ,v1

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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 6kp0s skj,bo *+a)usy, rhw)w the frequency is *w) ssrj+,hkkw0psyu a) b,6 otripled?

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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 vo3lh8b(51kbb 9b :wlq jvupfq1ltage across a capacitor approaches zero, the capacitive reactancbvulbl : 91(3qbwjfk q8b hp51e 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 voltage.q8*o2i gaeiys of the inductor and capacitor in a RLC series cire*yg iiqa2 8o.cuit?

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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 y p cx8dvw77t9is 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-w/6almn zqm. the circuit increases if R increases. Wqn azw/m-. l6mhen 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 if90o 06bup gfqb $X_L$ 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 serioc zw3.u(cg2(,uwu-+feacd dt j2wv,es 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 .l1p7tj hii+m capacitance both double in an LRC series circuit, the resonant frequencyi.7pt il+j hm1 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 driven by an AC ap/qdh x(0aryvl(8;t u cplied 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 RLyx up/4qnn,0rC circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotatin8nz qp+v0b 6d*2poxe lg 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 par+b dep *pq8o20lv xzn6allel.

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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 m8 :x1cyg:ti1 mzf0myj 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 fieldm m 1f0iz8c1:: ygxytj 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 radiustzgkvpl-qs:v c7, r- mq. ba1: 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 cbv r,gm 7 qs-tq:.1a-vpz:kland 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 pw (3w zk4,jalan adjustable 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 cohjh1 *kr -wov8il 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 2e wk09 6k edyj)7xsd.l00 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 e y0d6kw9). j7edxksls, 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 any) zwwla5- 7 r(h.*ilr s,sbpiza/x4md 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 6 /aw r2+f9 mnsv(yuk hn.fb9e+eyz 4marea $0.20 \; m^{2}$ 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 mp )j dk1ix8cg 9 0w h70fk,natbp3jhu1 flies horizontally at a location where the downward component of the h3p tbauwfgj7 kdnkj8)ph,10 i 01x9c 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 (7:c;phvslbq m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one o:vqshc7bp;( l f 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 cross8m4ka.tuo8db ;s n 6x7.ylg:h y gq,2 d)jqoaf-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of fr*-jhakpxx769b f 5 r .bel*zvoi6d4area $0.090 \; m^{2}$ 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 loerh* )kq7q ;k 39vxxryeu en96ops 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 rot 36urqee7 ykexkn*9xv h)rq9;ates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of ;+zj gr;+cg lzarea $0.090 \; m^{2}$ 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,a. vvv.w e8vp generator with an output of 12 V maximum when rotated at vpa.v ve,8.v w60 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 gene lppz;vp6-xz) rator with 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 resistanbd4z*4pstk2avo jv3eod( eqa0e 3-5c ce 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 resistan9mx7 epv1imim4 qb5 6x fr8 l,jryic7(ce of 6.00 W. The motor operates on 120 V AC, irfc7mvx im (i 8 bqy71pr5jmx49 ,el6and 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 internqyi5m*k;- )5vddsdyp al resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.i)p5ydkd ;ymv*5 qd-s 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-e/; mjc+5 yipqt /xw(wmc l*mu22ul5 gV power supply. The operating current is 1.0 A at full spm; y(c cw 5iu5mquegtpm2x/ljw*2+ l/ eed. 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 :wxq(ac+ +ivs*qoz )tconnected to a 24-V power supply. The cx(at):qz+*w+q soi voperating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a pri/g* gt1j -pimxmary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer jpoecp0s;2f 22fn tx *causes 14 A to flow in the secondaryo 2ft;0p s*2 j2fxnepc. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V priv:epkj8r9 n *6jc (7u)fe-.imkfec6fxcy/ onmary if the 24-V secondary has 100 turns6 j69nmir c8f/eoxy.k pef n7cekj:u*cv-()f?

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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 2pcqky f9 in4 owu;+t2,jq0fa9 000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current ty4;qw9cnkff 9i+ u q 2oja0p,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. Asz, kedvok,0p- suming 100% efficiency, how many amps at 24 V czk-p,0kvo ,edan flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer providesin b+ 2kd9f1x n.e(hj+1xzdbt 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary dx.i9 f(1 jdd1bhke2b n+z n+xtraw?

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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 3a zxpcu6 )..0gvn oaf9zm-t :el4uu3i00 turns on its secondary coil. If 120 V at 2.0 A is applied to the primmtcp09x uo .azi:-36g. zvuu n4 l)faeary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 30jqhkh*r 9/.s 3zpezcu5 ewhv h9hc:8g 9 v75mo0 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secon qro p57h5:zz.h *8vu9hesmwc3cgh /v9 ehjk9 dary?

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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 tranbx vviw2- :o- gsxvv-z12lzb7sformer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the :7o x zsl-vg 12 -b-vvvi2wzbxsecondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns andg-wk w )z:t y,ru9/xrx:0vipv its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the sect,xxwk r/ 0 )rp:v-:iyvw9 zguondary 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 secondar3n-lfg, u5t)syjyfvb sq15z t o w25klwz7-v7y has 200 turns. If the power input to the primary is 100 W, we can expect the powekbg2qft1 vy- uj,w7- 7zwosv5 ltl)553fns yzr output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltag7 70v pl /zemuip6mchvp:i;d:e 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 secondary if the primary has 200 tu0m;7vpppzhd/m ev:ii : l6c7 urns.

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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. The voltage is usuall gus-gc(k*7y8 rul i-t;p t+4db;cw j tya;e+gy stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Finy t-;kj w; c4yl+p (+et7iau*g8c ;rutb-gd gsd the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltas k-rd9tkzdg+ot) yo(9 ro:* hge 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 powd r*h+sky dgr9:o- 9)ot(kztoer 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 kcehmm(8s..cfq/ 5np 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.m c8 /q.mhf.ke(psn c5 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 has a toe 2k* bypye- pkv*06aytal resistance of 0.60 W. A generator produces 100 V a6kyky*bp0y-pv 2e* eat 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 lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much lei09w hg85no lwss power would be lost if the power were transmitted at 3000 V instead of at 10hnw go9 i05lw800 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 genetk i:n, olm5i(:c,y1 e howdp:rator 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 powm i:op,1(5wdty:hn k:oceli, er loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in them+f ncl/7uau 7mk 9w)8nc)y cw coil's magneticwm7nyaw +9 f))7k8ccnc mu/ul 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 an1ym(wwe 5oak* ss8 lg:d0l3oad an 18-H inductor. What is this circuit's tilak:s me(o8lgd aoy 0s3 5w1*wme 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 137 s c2gaz7pvr wn0gp1 icwd/q:gu0c, 20 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak; k- sq+aeg*qk 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 i*v.tt/ 13gb qklh .fhhnto a 120-V AC outlet. What is the resistance of the lamvgf.kq h*btl3th. h/1p?

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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 supzh ).p gg5h;wa, ebfm +22mk ;jsdxww57sic.xply. What is the peak current through the resistw;g;sh 25. w .x wm kis)hz,xm75pgj d+cbfe2aor?

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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 120.2m pvwtbk1atu41x- r-V ac power supply. What is the power dissipated in th1tm akt.4bp -u12 xwrve 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-W r3gp- 2jpn4xp vesistor 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 resnp5wqe36.bs0 e lg5qz istor 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 +.hq 6ztm1lw4s oy5tpa 50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.023 2uji* oe8 fv.fvebh-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 2aej/pz 2jug6cc5 t9u6.50-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 reacta bi 1dk8(lz/j2st)qx fnce?

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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 for4u ymfhy ea5904c :8br9lxbqgz 5kb 0s 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 bei9p )c nl4czmn7k7. 60-mH inductor when 120 V AC at a frequency of 20 kHz is appl emckz7cn. 7linb4)p9 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 due to a 110-V, 60.0 Hz so. 5bqy4g+acn6;:m3ywc rsfq m urce?

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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 capoayu fj.is ham13wy9+/w4zt :acitor 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 h m-wt; (dwwcwae0+i 0eb 0do0*r7dzf 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 hav 1,2mj zh9vcda1y- cuhe a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be 10+qfp ; zs.hd4m0 W?zhq;+s4pf .m d

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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 0.00yhvpf50;qos/ mb. t uw5at *c,10-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 ac series circdo,74n rk.b l u4e*f pmsh3l8cuit with 12.0 W resistance, 15.0 W inductive re7l8 l,mfbp*knu3s 4 ho 4e.dcractance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20j i0x2c9wd)tu-mH coil, and 1.0-mF capacitor are cc29wt)u ij 0dxonnected 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 y:.x 6pewkz;zl7gwh7 resistor, 20-mH coil, and 1.0-mF capacitor are connecyz7kw6wpzx;: ehl7g . ted 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 is tojh: 8+:tf em m;i fdeq0bu+-mhe impedan dtj+e:fh8 q+:mmm0 ; ibfoue-ce at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is conne +xf 6o,d*unne .a(d3o;a x)ulnt0kil cted in series with a 20-mH inductor, what is the phase a ktn;.(i+*exux ) 30nodalnlaodf6u,ngle 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 ine1l 8ha;3 b6 jd,gjhhj a series circuit with a 20-mH coil and 1.0-mF capacitor forjh3a1 hh,8jl; eb jd6g a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-Wsnrtm:xu 1h-7 qmd4 ;a resistor and 15-mH coil to get a total impedance a 7 drxh:-nm41qmust;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 inductoru dag) b:;q+q 3r)qrbq l)s.xt at 5000 Hz for a total impedance of 40d.ust;+r)bqaq grq b 3x):)lq000 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 xv 8- s dopcgq3i4v(y5u,ay0w100-kW resistor at 1.0-MHz for a total impedance of 150 y8q co(v di5u wsp43a0,xgvy-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 cp utb9ptjm/s*a9 he-t4 ny p+.onnected in series with a 20-mF capacitor. What is the impedance atypt ttu a4 jpm*.+e 9-s/nhp9b 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 cap;lfed lv6;:gkb dzm39acitor at 1.0 kHz for a total imp b ;gfde 6mk3lvdl;z:9edance 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 w pbaldjsx28n. 4f* 6mmith a 10-mF capacitor at 1.0 kHz for a phase a4mmlf6 j2dn bspxa.*8 ngle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.zg)9enfkg62t 0 kHz for a total impedanc z)g96tg2 fekne 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 capj 8udpc/ 7a*qnd al-;uu*3l0um4no rpacitor at 120 Hz. What is the phal4a; an8dl*cju qu/p-d7 u r3*o0nup mse angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 150+ 1 +szd35jmq/pcen2p(a5 x/ddt cp kk0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected is5 dcpd+apk1/n/5 jcdeq m k3(pztx2+n 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; e :psgvb-r+x, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power s+r :s-bv ;epxgupply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor 8f*( cn.8lmtia5qloaof capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power588*nf(l ol t .caiqma 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 j q li.q ag6lgf;7k-7ia 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hi7kglj gq.f 6q7 ia;l-z 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-W resist49 0dlu,/elg (atqpn uor for a phase angle of/ ld u09t4,lguaeqp( n $40^{\circ}$ 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 tdm8.5 nahw)*qqbh, m frequency should the circuit be driven in order to have maximum powe *qd8a) bwn m5qth.hm,r transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series c ei t66*(msmu5vjhe y2ircuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a memh6 y ui jev6(s*2t5120-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 a7.gfvn 5epz mt(w0ixj k(o5 (tn AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of9z u0dmrjm5 2r4)5 kg zi+ragm 60 W and a resistance of 30 W. What is t zr4r59mg gm +kzr)mj5 da20uihe power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing -z;3x/k: nqu6cqd/fv rgoxv o 0e-q s0a 50-W resistor, a 10-mF capacitor, and a 0.45-H indu6qo s ; cfqug0-kqx :vnd-o3/0/rv xezctor, 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-mFp, lbvi/ic8smxm1 0p, capacitor and a 15-mH coil in series?/pl1v smmcp,0x ,ii8 b

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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 withiw m9ep2g 06dxg7k d7e a 4.7-mF capacitor for a resonant frequency o igxddm ge 7ewkp27096f 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 series with a c dw/-bu1.5 ucud-rxjwvo f;2 3.7-mH inductor for a resonant frequ5dj 1/wuwdub .r;uc2oxc- vf-ency of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resawjqrv08 tg 6vkk-62yistor and a 40-mH coil if -a 8k0 k6r v2wgty6vjqthe resonant frequency of the circuit is to be 1000 Hz?

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