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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://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://51fly.win/test80.html  教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。
 作者: physics    总分: 142分  得分: _____________

答题人: 游客未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux expc 1d/fyf)j f.cept

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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 inductiox 7v6d.tej6 zdn 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 producesb2e4rvx3u4dl9y t; he what kind of change on the924;u b yeh elr3vxt4d induced $emf$, 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 -iw/, d gv gaie1algd1 8)(uoumagnetic field through a loop of wire produces what kind of change on 1ia/1o8uga-vedd(u wl) ggi, 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 bwgw)iz jd *-5of wire produces what kind of change on the induwgw- idz*)b j5ced $emf$, 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 fromqzww/ x qy9.x) 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 curoy lri;11 4 tgegwi f)uc1c(;prent in a conductor will be that which tends to produce which of the following ;u4p fw tyo 11gg;ccr i)(1lieeffects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies7vv f9n. c;o0tpt 5kke flat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from abfve 5potn0.k k9v ;ct7ove)

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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 horizontalb.xtc80i jou2xp n1*mm. bn8nu,k je 3 table. A bar magnet is held above its center with its ntb0j82.j u3bi ,8e on ku1mx*npnx.mcorth 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 table top in a region where the magnet v4c)bh0 ,cpjfic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced b)hj ,4pcfv0c 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 rv hd:1z co97b2asbe, field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced currzb,1ase r2dh: c 9bv7oent in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where t9 r mbf qo/. 5*caglz+wjuh60lhe magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the directlc60ab.* jmr5+zhl /f uqgo9 wion 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 table and carries an ever-increa2(;wy6tm cw7krf f)u nsing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced currenffnc7r6 ( wut)2yw;kmt 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 ty 4(vc7pxg )tp lpua6.hrough a loop of wire with the north pole entering first. As the north pole enters the witp6.la )47c(upvgy x pre, the induced current 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 u.j -vj7. e 2de8oypelconstant angular speed about an axis whose direction can be varied. In a region w-u.oje 7j plv.2ed8e yhere 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 rotao4 lfbkj sb ,e8h3tc 0ky79q)gted at constant angular speed about an axis whose btfkkc87oy 30l j4g)9,hq ebsdirection 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.+6bp30yebfzjx 2iu l55 iw (wo
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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 ancrqpjwq*741l5 4s6gavce 5u a $emf$ 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 magneticn sg;v 8 . b5kzpwp5xvkuc,01w 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 d8 n7p/har)ns (2sost ;pcupl4irection) is moved northward at constant velocity through a magneticopt8a;h)(lc n2ss4 snrpu/ p7 field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angularlsv s3z 6 h0q:7zta+my 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 generatoluctv m,*bxde .-0nb6r transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 rp v6 kut/f:awahl6l -1evolutions each second. The frequency of the:v1k-a6pfu wa/tll h6 $emf$ 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 devick.etczam8i adt8 p /q:fc2.q:e 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 thau) t;b samol3ue d3)l.t

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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 cw) trfpq7ria(: o v.:xoil contains more loops than the primary coil then p o:fwiar.7(xr: )qvt 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 the g *ki(;y ub(hv;hzms:secondary coil then it (hz ukvyh *gi;m:(sb; 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, thc b6l/-61lqlb x:xo wxzjg y8)e 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 cuc0fzt9* l*b:43 f*cjhmgabrcuit,

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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 co uy7;p4qu3uv ygh)qz0nnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the rhuzg4;0uy 7 vqp )3qyuesistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to, n3f*n a e;eqrgmz.8q an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inductor qen* 8gqm3;r.,eanzf 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 inductanc yfv /sqk6sk lw*;qe*:e 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 bnf1ap;-zrxy jqy1l b4l3n;: 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 inovjk22h +7ydjductor are connected in series to a battery. The time constant for the circuit represenjh2+v 2y jod7kts the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The battery ict48mw0 4b6w(odl d ip8l+qa is suddenly removed from the circuit. The time constant fo 4dwi8+6 io twdla0mcbl(4q 8pr of the circuit 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 same units e )lu e7)mr+qxwxcept:

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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 t01/vhq.ukiek8bgqk w9 4 fp-power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connim9yrfab p (t 7q56q*ny4rm s dq6t1o5ected to an AC power supply. In this circuit, the curren4b 9q5i rmt5atyq1q*nm6 6ydo7f sp (rt

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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 ac5n( 9xuqze zd7 circuit changes by what factor when the frequency is tripled9dxe( 57qzznu ?

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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 voltagectiwcwk;tu49oiz.7u uyf7 fdt1 2il1:0 o*al across an inductor is doubled, the inductive reactance o2 u1*zwi97.ulaoltuoi k f0;4fc t:yi t c7wd1f 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:y+ciyflc03x( i c- qdg z:q*fhe AC voltage across an inductor approaches zero, the inductive reactance of that x y +f:ly:qdiq ig- 0ccf*3(czcoil

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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+ yvo /b*7eeod b6q mtg3hs-a6 this circuit, the currentm o+db-e6qt6s3 /oe7* ygabvh

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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 c)az 3m 4km7phchanges by what factor when the frequency is tripledmc)p43 h zkm7a?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero,b 6y ug34ius*t 1mymg ,it5di8 the capacitive rt sgby*md4i y6u 5 m83g1it,iueactance 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 ux0y: onohsmqtd.s5, :b k, 9mand capacitor in a RLC seriesyo:5m n bs,.tm0x skq:9do u,h circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit ib3(d;f2q u bsms 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 circui l llr)jbj:0qof +y8n idx/q-5t increases if R increases. When is this statemenx l5b:d0r)f/qyl+ jl8ijoq -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. Twfi5z 5::bk anhe impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit increases : yois8ld /,mih8hw9gif $X_C$ 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 ,n t2on mrw 8g861sqyfseries circuit, the 6omn8n, fg1 sr8qwty2resonant frequency 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 app+/0e knu9iv gn rhm,qx t9y+y7lied 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 ciryzh4-bw fx .a9i2h/j ,ciju k1cuit 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 rotatink v v9p+9g :f6slkgqz.g 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 g+ 6svgf . p9k:vz9lkqfield vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fieynaj925 j,g /ugab,(zh 6g yycld of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnet( juagy, acgyg2z j6/5,ybnh9ic 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( +8* ym7cve;g3-nn 36 wbeurpyqkxil 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 at an angle be37cvkmnn6r+ux ( - q*8ywle;i p3y gof $30^{\circ}$.

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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 *n+c )z6y gkwyuj4gj 0 fzt(8csingle loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil chang .9npck.k fyq ;pv9dp1es from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with db3vqc5 oo:i) sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 : qcbv3)ido o5T 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 an areay na4jhp0x ;q. 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 a+9xo. s0 flh dczlzf a-qw.c6) eof8h9nd 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 wing span of 60 m flies horizontally at a ny 662jobt;(/xg l0bpckd j4b:4aaqvlocation where the downward component b:04j6c;ad bjnt b2/avq4p (okxgy6 lof the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant fs1absxoh5c -n .dmeg (+22 diangular velocityde hm 2o1dxicg(2n+5-safb s. of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator )p1vyvbplav gq; *i2: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 turq iz vmda;arrc*,)wx(jmn /-*ns 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 , -zixo:u ;6pmfnkx g080 rectangular loops 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 axis of rotation, what will be theu,:-gx;p xf ikm60z no 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 consik* yl ua* k7n;m) 5)zm7dzru2ia yn(fsy h(h-lsts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced 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 s6;fp fu *gm ,,fcmn8io 6lb1gpimple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rota6g p ,fon*gl u,;bfmp8f6i1mcting 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 generatorsc g)0f-ap c.bk+x4 aw 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 resistance of 6.00 W. The motor operates o.fm;n prkk (0z)m rj-kn $120 \; V$ 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 operates on 19man+ bgm6lcfgv v6l64, w:se 20 V AC, and when running at nv6,abs+ 6 e9:l4gfg6clw mvmfull 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 resistanc u2s;8 cnrk;ebe 6.0 W is connected to a 24-V power supply. Th 2 b;n8rcukes;e operating 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 connectedj*6) 4 (.(qjangpqffwkeppr3 to a 24-V power supply. The opef pq*fk(rnpj4p(w36q ega)j.rating current 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 supply(f p 61k/ tn.d) 7jc2fow71nqx vhhqmb. The operating current is 1.0 A at full speed. What is the backqh.q b f/tfw cmdpn)6xhk121ojn (7 v7 $emf$ 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 needbxdg:w-o8yv :jv+.s0f*l6p693gnio qpwrs m ed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer ca2rm e1 zsee77mz0c4un-ntk5j uses 14 A to flow in the secondary. Hotncme uejz5s4770r1nm2-e kzw 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 primazy1,(wc:eru)tgn8 v6nn om1c ry if the 24-V secondarutgc :v(ynnmon1 1 e8 ,6)zcwry has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil x u6 ;i *z.hvp(xf+wotand a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current pfx;+u v(xt.h6*oziw in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% efficiencgs p*shgu1,ws1 t8x)(sz3y:ycwf 3dxy, how many amps at 24 V can flow in the secondar*y3wxswhgz(1d)1s ts ,us pxcy3: fg8y?

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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 neon4x8x 9u l f)xx5 u/9map0qztpd sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. txzq9 pl 95m0x/u xp8ua fxd)4What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on itua*d 6id(32hsmr)ztr s secondary coil. If 120 V at 2.0 A is applied to stdar m )zdi(h236*urthe 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 60 turns on its primary n-5;c+nn3cfj 6ejtqo coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is prn -ctn f65+qej;3onjcesent 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 h7 oso/ka f7. 1urb*g jylehf1,bt :k3jas 200 turns. If the input current at the primary is 100 A, we can expect the output currentl3e1fh7/gfrauy s b.jt7ookk*:bj, 1 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 tran1:p/ uv qkg0avsformer has 100 turns and its secondary has 200 turns. If the input voltqp0k v1g:uav/ age 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 100 turns and its secondary has 200 turn+o/pz7yo)on awn08jr3 y .xbxs. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional oaj.b3rp xwn0)7 +z8 yonx/oy 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 :-+ ub5sa2 igk twvs8h120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turnvb5u: 8ikt2h ass- w+gs in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is u ba*) npwr9yvqt x4)f 1kr.te,fq73 qbsually stepped up to 4500 V by a transformer and transmitted through a power line of total resis7. q ptn w49ft y rxbvb3fq)kr*,)q1eatance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually steppe4t, fn )3etpvwrd4kw :ir4w e-21aqued up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission e 44- iu4dt rtrk nq:v1)ef3a w,2pewwline 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 hasqof/ad tr n(*2/m+ eaa a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not usm/r aof t(*qa +ad/2need?

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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 total resistance of(hjn,. ;j6h6i gl qmuf 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 qih(;u6mfl gn.hj 6,j 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. r*adg5r n qd(t9+d92vnw/hoc How much less power would be lost i+*dv( o gdwcqrd n/2ta5h99nrf the power were transmitted at 3000 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 to bkl+ev*)gv-cg9n af8w e transmitted on a line with resistance of 0.60 W. To what voltage must the generato nf*c -)v8gwe 9av+klgr output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stor,l)vh nve/7bm )bel9axeu2vol+ r47ied in the coil's magnetic fieldnrbl i74e+l, l)h7evbx uev ) v9am2/o?

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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 contaicpc h)8ula y,-ns a 6.0-W resistor and an 18-H inductor. What is this circuit's time colhy 8-,pca)u cnstant?

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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 V?/6 b4z:ltcen h

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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 peak29k ah+whwwi(2nb1d, yf9moxpb7k-a +8o hvu 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 i;i4a snu5fv g:s the resistance of the lamp ngvi:a4;f s5u?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. Whath 5usojp:od )2 is the peak current t5h):osju2od p hrough 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 sbe; ogq)8xl,(u5vu.f1c nry ac power supply. What is the power dissipatqbs5;ug1c)n rl (.ofu,yv8x e ed in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistulf *dvy+47d kor 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 *;k :r o)txxkpa.,opk is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W r s6 tkzhtm..8sesistor 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-mscnv-dc3rzz+v:+ mbmqf9 .( bH 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 rs4xqkb* ydf/ nyttm 4*ba:dcpf3 b;* )eactance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 We5(xtwj 6ups5(t+xx f of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of ety) 3jk7vpk 5q6v u o)l-h2yyinductive 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 inductmvit,u1 nw4 q9s49e ajor when 120 V AC at a frequency of 20 kHz is appliesa4ivut 9w,emn1q49 j d 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/*jrqop/f.gq l* 4loo 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 rea 4a/vkwzah24i k/5dyactance 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 of capacit 4w+f b,m 5zug upwa8gqfk22n+ive 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 h 856rvvj9 m90oduc +nrpalhn0ave 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 reactanc*p(s 2ylgnd; vm;z 4bre of a 0.010-mF capacitor be 100 W?m* ls;gv;2y(pzdrn4b

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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 capaci k9gxn0kuueqf(5f v m*1eiz4)-qcz ,wtor 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 ar4)o ug6hx *hmn ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 1)g6 uohrx 4*mh0.0 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.dbn r/ notaw+ g0da96 if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected ia6b 0nr+9wdg don/a.tn 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 ubo7r4a kt*j.bng: w1u 7bol1if a 100-W resistor, 20-mH coil, and 1.0-mF capacitorb1og4n7jr. wla u7bt*kb :1uo are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH indk:z7z mmr/eh7fp-y /6v1guit uctor, what is the imp7 ium/7ztrv-1f/zk yg6 hpme: edance 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 connected in series with a 20-mH inductor, /tgcqm 8 y-t.gwhat is the py 8./tc-gmg tqhase angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a s)ye23lv)(m.y kgtb x20-mH coil and 1.0-mF capacitor for a total im )(2bgvksely )tx my.3pedance 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-W resist/h6 qaz;h3 fny0l5 ubdor and 15-mH coil to get a total impedance of 110 h ubl3d6n50zqyhf ; /aW 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 inductor at 5000 Hdsha1 n)d.;++pairzm z for a totala.z)d+;h imna1+sdp r impedance of 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 eb5 h+zgs2ko:with a 100-kW resistor at 1.0-MHz for a total impso:2+g z5e hkbedance 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 capa3z 5vi 0+r27 uac:rdy*ymiu5nkjhr*w citor. What is the imped 7wr5y rh5nr3*ii0:2+zdaj ykvum*cuance at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor ath b8xsxz1 o(g3 1.0 kHz for a total impedance of 45sg xxz83 (b1ho 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 aplm e n/k. ipe23qig *gl.:h q(;:hgle 10-mF capacitor at 1.0 kHz for a phase angle of lkg(;/:plg q*il nqmep heeih2..: g3 $40^{\circ}$?

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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 1.0 kHz for a tota ix2krrwq3h, yr8ofjej6p-6)n q.n8 pl w.8 q ,h6p yenx)r2r8kfj i3-jqon6primpedance 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 at 120 Hz. Wharrap6;bpn mavq(w; 5 tlj12s6 t is the phasam; 6;rwrvt6pjq 2na(bs p1l5 e angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1ync g a 7k p(-(8/0ylmpss6anc.0-mF capacitor are connected in series n /ya smkg-pscyac p6l8((n70?

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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 resiskkl*ftn0m6t/ tor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected nk t0/k tlfm*6to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a ; zrg2/vi4pexcapacitor of capacitive reactance 30 W, and an inductor of inducti/24p g rvzxei;ve 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 serie)kv5ucan si 9)pti3d) s RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a)cnpa) 9 viisdtk)3u5 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series du zsg9vjwaekl1e*j56z ./8 xwith a 500-W resistor for a phase angle ow8vse */z j 6k.djzu159xal gef $40^{\circ}$ 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 R8:t9dqrmgc(s 0 )bpaoo vf/0kr, iib+ = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum powr0sai,/d09bmrkvco)o qb: +8tpg i (fer 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 circuit with 12.0 W resistan5hk av3gv i 3 gp8x,kx-g:/prmce, 15.0 W inductive reactance, and 10.0 W capacitive reactance,kv5rpvxh3g83x/p - k,ma:gi g when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC+qu; +knrsg 7e 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 and a resistance of 30 W. q(3,fpyj vy umg*j43vWhat is the qg34( jj py,ymv3 ufv*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 76zr ,iz/vi-upn (q6t xu(zguRLC circuit containing a 50-W resistor, a 10-mF capacit6zr/g6q(u znip ,vui7ux (z -tor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant freoid3;ta y,9t+x kyse/quency of a 1.0-mF capacitor and a 15-mH coil in series? 93y/; tsaykte +oxi,d

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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 resonaz zny k: 2.p/i:i*aii/5cufwbnt frequencn*2i zz p:/5wbu :ik cfi/iy.ay of 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 3* cot-yqs x:vo;()ngf.7-mH inductor for a resonant frequenc)-* nsfgxtvoo(;: yq cy 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 resisto(2ktowyev/ s k6,75trmcs0ow r and a 40-mH coil if the resona2kt56(s 7cwvo/ket s0 r ymwo,nt frequency of the circuit is to be 1000 Hz?

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