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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://autoconfig.51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 80，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://autoconfig.51fly.win/test80.html  教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。
 作者: physics    总分: 142分  得分: _____________

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of mmv j0o*/ria k q:jork 8;krr32i)cnd-agnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states tha:p huk8mk/5ab t 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 0 d8/cpwhfps2kind of change on the indup8 cfh0/d2s pwced $emf$, 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 th990dsuaqt;d y8ugj 5w47lm d de magnetic field through a loop of wire produces what kind of changequstyd;4d da g0m5dj l w9897u 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 of wire seh:fkpdg6 ncle((3k p7,ie9de g/ )dproduces what kind of change on the induced ied(ph)69e7ee/ gdkgcldp:kf n,s(3$emf$, 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 fromunpt y,u)4fy,h e s7t, 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 direct cv5ylw(*vpjlj 5n 9y;ion of an induced current in a conductor will be that which tends to produce which of the wylcvyn*59j;pv5l j ( 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 held ait)sk7 .sh vmaw*0v0 ubove its center with its north pole pointi0* 0kt. vvamhu7)sswing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizoniup+f jpm:ls2 ii+ 7c c,04brgtal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet in4:c02gjs,pmbiir +ic 7lu+fp duces (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 tabja7q- h 8widk1le top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from d8 -1j7k hqawiabove, 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 tablh 6 3,dp3jozyre top in a region where the magnetic field vector points straight up. The magnetic 36jdz ,orh3ypfield suddenly grows stronger. 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 ,yz8h ayv f6h-jk bmf2lk*y3) horizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. ,yzv68fh * m2khj yy-k)fb3alWhen viewed from above, 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 table and carries0wqee(6y f/ zu5a 0t futa/d,a an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of 6t /0tywf (f0,aaa eude/5zuqthe 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 entering first. A0h)h/ nwj iwnw7*fzirzq5 a, (s the north pole enters the wire, the induced current will be (as viewed from abo)zq,i /*(0rwwhza5 n7 nji fwhve)

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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 spe . n.q;nb*f,bamh yw/ged about an axis whose direction can be varied. In a regioy,a*b/wh; bn. n.qm gfn 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 constq*-cl l5i6/ v/psng8gxusrv *ant angular speed about an axis whose directiol/p s/si*x*g6q8 c ug lrnv-v5n 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.zx v oulqg3*jqje*(5 ora3-;s
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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 thatbe- ead9;6 ,lyiaf;8xgg n/ogtq;hy4qhk 2 l( an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. The c)bh4t72l6orwkxav0 $emf$ 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 mo(bsx ou+/5rbdved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the roosr+d(/ x5bbud.

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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/ktfri*5. sut 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 transforq *-wd3 s9xytwpi.x(o ms

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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.r s04f)rr8fsw5yq q 2p The frequency of tyr8rf qqfwps052s )4rhe $emf$ 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 used ttop7ihev;g- s ze j-3+o

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a devic*l w7+i y vk8gwf*:zcqe that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains mo cu 26dad)sb6kre loops than the primary coil then it isu kb6 cd2)6das 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 co)f. *tzm, exodntains more loops than the secondary coil the x*.zo,f)mt den 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 3gs*8bi1sx asqua)i,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 co)1bl 39ssw81rjs(8j qdu sdgircuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of conhj0irm5rfj xhpa2* -y z* sw90stant terminal voltage. At the moment contact is made 2h-j0wi5hr rf sjp0xmz* 9*yawith 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 to an ideg0qu 3c-zbs +bal battery of constant terminal voltage. At 0+3gzb-ub qcs the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is co/ui3j7f r.8u2-,ywxfcel cjqnnected 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 :zjjvc l oip95 9dug sk(+0ga/with 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 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 , lpvjq0fwsp;yr3 3eje9; 9htin series to a battery. The time constant for the circuie,y w;sh;j9jqpv30 r 93tlepft 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 conneh v0 39zo )aqs( s34fkcawe(ilcted in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time fca(3v(wqe hiksz)las4 9o03required 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 s0r0mn lwns+d )k4j:tl ame 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 thisbx9kmj 9 e8u7d 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 c:*97 cni jo8iqd xzn2bonnected to an AC power supply. In this circuit, the currenioz n q8*xd7i:2bcn j9t

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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 frequ+ot:p4t,icmi: mhdx*b:fn3 qzr -a 1 cenc 1i 3p n::md 4hmzc+q-f*bir:,oa xttcy 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 vt xi(1bm.xj ,qoltage across an inductor is doubled, the inductive reactance x(jt .1mq,bxi of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, the inj1ny,3+tql exductive reactancj1x+q el3,t nye 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 cogrrpq .s7 op 8cef.,l3o ;v9AC power supply. In this circuit, the currentcrpeo7o .v9lf,8cr q p.;gos3

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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 ci ( ifjpxzrcns: n37yfnra z :;s7j*7;mrcuit changes by what factor when the frequency if7r*pzsz 7n x(:n: ;i mnj3csajf 7;rys tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, lc6 (lr8env;xthe capacitive reactance of th8cl;l rv6ne( xat 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 cb wctm)m1sf czc5 (.4tapacitor in a RLC series cit )mctbcs(1.5 fcmz w4rcuit?

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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 is d:(-rsi 4a ewjyefined 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. T:wsb( 6sh.p1fm j fsv7he impedance of the circuit increases if R increases. When is s vf(1msw:s.j6h fpb 7this 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 ieykfz4fjx066ejd 2 u ,mpedance 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 impedanjz yhna0j ;cqvxlp9m 0: ,r(t*kkz 7h-ce 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 series circuit, theb d z10bdk9t/.r.3 ngyqie1if zo k2s+ resonant frequency of that sy k09obd dz 3ebq1zg rki+2/f .n1it.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 drivpz/ s4843g*4zb0z ntd abvvq ien by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circui;31kroyso o ,rbmk:c cmn45m8t 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 r z 7gv5-f/xjusadius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plag f-7 v/z5suxjne of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is r4rhog4x1 3lqr) w(lmyotating 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 ax4l4hyor3l(r mqw 1) gre 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 a/cciir :st7u2 +m/o,3 unvii0.10 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 at an asi o,+n7c3i ua/ m it/2:civurngle 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 ax(4 q lv 5tx)rvtyd1l7n 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 coil changes wx,d .r6sr*la 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 5ijqy3u wl) r5with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the j)5q3yi5urlwaverage 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 at0is- 7bxk8n frvo2 *end 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 anveg o nxwfks24;s9 2l9d 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 60sa,qqfup/7dj7 y c;5a m flies horizontally at a location where the downward component of the Earth's magnetic fie d5;fq,yu sac77jqa p/ld 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 consta -wc00sz isgx;nt angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant ma0i;xzs s-gcw0gnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional area;7xjn+ypk*t nw;y e+ m 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 consg)pny+l sq6q,ists 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 $emf$.

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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 loops on its armature. Each lo. +kfjb-*, wdlon ;va 9eotly.op 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 the maximum output voltage of this dae.wfkt. olb *vj9-n +yo;l,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 xpve z6y03 mb3m) me 9ahhgc25of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator q0kqa8rjj.;f with an output of 12 V maximum when rotated at 60 Hz. A maq. 0ja8qjrkf; gnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a+x mk3mzj l:otqb42f+ 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 opera h5ncq 7zn)6dsi 1(phzwufj(9tes 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:gt5*d* ekszpbw,bz0xrg :dmd 30 e3b motor have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speedtk30 bp3:gwzd*s*e5bxzb d:red0,g m 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 zmq ( 0/lvw.s3 wpnt5qresistance 6.0 W is connected to a 24-V power supply. The opes(z w3v.wm0pqt5 l/q nrating current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected t6oov 3l:j79q f l1ps pb4g*n*vv,62dgyvbzx no a 24-V power supply. The ope v*vgz 7ybop1npbd3s4gqol9v* j 2, n6v6lfx: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 pp6io3jlj crnmzmue)i ; 4 9y76h+3ga6.0 W is connected to a 24-V power supply. The operating current is 1.6 p grz+3 u)i6l9cji n3; oe7mjym4hpa0 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 primary voltage oft*1amj*lqs1g/)e /ym lh3;k dt*ka(yty 2at u $120 \; V$ 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 primaryho./e9v/u8x+zbxx 60cq d4jdt klnosj:9x : u of a transformer causes 14 A to flow in the secondary. How many turns are in the secono:jz8sxt+xx9q90d.4ol /6echduk: v jb / nxudary?

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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 areo7g;:lts o(j r necessary in a 110-V primary if the 24-V secondary has 100 turns rsgo7;lo:jt (?

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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 seln) 8os4erqo 8 wuwx,1kd*yl4condary coil. If the current in the secondary is 3.0 A, what is the current in the primar1 4 ,ww)xqry*e848sko o llundy?

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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% efficien d z wu2 ao5kxnj02sq.owe/.9kcy,swj5x d 2./w2 e9nozkaq0k.uo how many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transfor e(+v 5(zzvsz/uv j4k8 tvfa1imer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the p /v1i 5es8zvfj(zu zt+vav4k( rimary 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 tq 5e-jtrm)0b2 w pad(durns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in t rtj-)dm5b q0awpe(2d he 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 prima* a-jpgawq(h73gq8q fry coil and 300 turns on its secondary coil. If 1g-a 7h *wg 8ajqqf3(qp20 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 tranfoui s(m e y2ig66jd)1sformer has 100 turns and its secondary has 200 turns. If the input current at the prim6i m 1(go)d62uy fesijary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 tu;gm7 v 1wsbu0rspjo pb7)ag /(rns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the outr7p/b (ap;o1u07svwm bsg) jgput 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 secny9(kf roe2e-5)1tj cmv, w econdary has 200 turns. If the power input to the primary is 100 W, we can expect the power output o2novf- 9j,r(wy)cc1 tkme ee5f 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 vq(ml + 8bdm6bfoo 9z3ov*2xrqx4,phA of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a pxdqblp(2 o 6+v xbq*9fh o43zm8,v morower line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current a6vmj.un; b rcsz n.w8 *+fhcn,t 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0uc;+,8nhjm rznn*s.v fb c .6w 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 usuallidvzwqi uw)rl0d 700ym k5jwd: l) 9a:y stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lowqdumv ilj)w iw7k l 9rad5)yzd:: 000st 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 lon b4z/ .a.m.d3zv agkg8r ; zb0 ojotlqhw4:r5zg 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 qz8zk.z5rr4bo/a vm3lg.;a 04:jz d .wb h tgothe 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 lonyhpn xdyp5 4-5/5t;xis/o gp1yghstv/ c :c8l g 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. xdc;y-/t5xci5o s lyv g1y s/45tpp:n8phg /h 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 tp/)5qsp9zg:opxv -v (snb3l3s vy d31000 V. How much less power would be lost if the power were transmitted at 3000 V instead of-q)sbxvz spn o:s93 dpyv35/ vtl(p3g 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 gene7xs + 5-bcvw 6yhvapd)ngx h6;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 power loss in transmission is not to exceed 0.010% of the original ponpwhv a)h7b66g5sc; + v yx-dxwer?

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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 cu3, 7yj yi7fdgjpuns omtcmn+wd 5.;eg6r-w(( rrent of 5.0 A. How much energy is stored in the coil's magnetic field? g fdjmy uscyp+ njwt rni em67d;(7,go53-.w(

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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 6.0xph7gu5p12gy 5re4pd enx - 4e-W resistor and an 18-H inductor. What is this circuit's time 2nugx5ph p 4 4gd-ee1r57e xypconstant?

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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 circuiw6 ,(atqu .rmjt where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak curr,3vgf 6xvs v ohq,3li,ent?

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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 placa6hda i-h tjc pk/o1x6lf)* /:fn.lfied into a 120-V AC outlet. What is the resistance of the lamp / xtlp *6an-ff1:) /iok6li.ha jcdfh?

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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. Whthm0z. ,p 4;/dio:fw d5k4gw anzjf c8at is the peak current thro4,fzo jwa;4n /.wp mz5dk hd8f0igtc:ugh 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 coct (apkv:ajc a8h( oh0ylb5 (.h(n9f gnnected to a 120-V ac power supply. What is the power dissipated in the resistc phly:oc5 8( haa j.(n vhbf0kgt(a(9or?

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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 resistor ishk-n;(w 8g8h c;ufs gy $I = 0.80 \sin (240 t)$. 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 ifqbaged,:x a*( n4 ie*: yhw,cs $I = 0.80 \sin (240 t)$. 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 al sp xq*b3fb75 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 oclhso.zqkcj* 2p(r-96w c2 glf a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1000 :3)q/pgrval y*hy5ou 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 wiw y7xf sql ikcs;x 3u8s+1l93qs.dfo4,blm6t ll a 14.0-mH coil 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 necessary for 157 W of inductive reactance at 1000 n0q:/ja(n tn(q rx5 ltfqxf 0cae *b3/Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frem6kls :e9 lz;p3fmmv0quency of 20 kHz is apmslv:f 6;z3mm k0e9l pplied 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 t4dp;irfv 4z *ldgeqij.s w ,u(zq .5p)o a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacidrs , l(lw;65n,yb gaw6z:rfq tor 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 h//v waq vxp+3r6tm,ii ave 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 12.idmy2+roptp9mmb h;4 fm+p - 00 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 100 * mzq+k3efl eigt+g.3Wimq3 ge+3e kl.ztf +g*?

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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 Hzljerbw19hd hixc 9/i2v 15,mu 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 cir nkmr6nm1ucm9klq/cu9/,t 69ebj ce o3m0gg; cuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive/c /1rk 9l nukgmcmob9t3ug m,nj9 0e 6m6ceq; 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 H 0bsaq/cnhi6w9,5, cqha, ljsz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are co0q s/la5j,abi ,6ch w,9hcs qnnnected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.08 .,d0zeaq1rfkqz l0w -mF capacitor a01z,0dw .lr qkezafq8re 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 inducw jd)* ee(/s u72vln1duj80byf y 8akx+ gtkt4tor, what is the impedance at 1000 Hz?4wetg 8j1)7 a/v8 su*tjfe kl+(2nyd0d xy kub

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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 seriesz8b*1sg obk-u g1ax3t with a 20-mH inductor, what is the p1z*kg xsgbu 8b1-oa3 thase 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 circu2sem5 x.-i,ipard bc 0it with a 20-mH coil and 1.0-mF capacitoripi2 s5mdba. e x0c-,r for 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 69r a6:ttqj 0wtzxzno. 9xv(hmc zf-*series with a 100-W resistor and 15-mHvwf 9tz(z 69t xh:0cjxa zn6-qmr. *to coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must b0hp)xrmo1 8 ms8k pb6he put in series with a 450-mH inductor at 5000 Hz for a total impedance ofp60xm hh1ro)bms 8 8pk 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for a -)zfdg(o l )( ,uxvaxb mbka;st59px) total impedance of 150 xtvs lxgk),x)5-oa(;ma zb 9pb (ufd) 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 seriebgx-z 6vj e0mc8r7/gos with a 20-mF capacitor. What is the impedance at 1000 Hz?8/co-m 70br gg6xzv ej

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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 capacv e4x9 -bnj3xzib.uzwe,bj( )itor at 1.0 kHz for a total impebjv4ix9j,eb(zn)3e .xb z-u wdance 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 withw7 ;rtz-hinj5 a 10-mF capacitor at 1.0 kHz for a phase5w-7 z tjinh;r angle 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 wn0rb5sx :g5zmith a 30-W resistor at 1.0 kHz for a total impedance of ns xbrzm 50g:545 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. What is the ph5+3uh psd+img ase angl 35dh+pug ms+ie?

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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 r/d3fl f d s6zwy vx14 xd1f(:(v4qhuxa 100-W resistor, 20-mH coil, and 1.0v/4v ( r 134(fydxwdxsf qd6x:fu z1lh-mF capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 1q rb4i v0 f)uufpa.yz,2 u-yl20.0-mF capacitor, and a 0.35.2v y)r-u2f,zu palb4i q0yfu0-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a ca)b3ze6n gtsi:hzt z5p9 ..*x yr:m nprpacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected i95nrxb z* :pt rzi6s:p e. z3n)g.mtyhn 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 9jimkkge7 b8 6g )zxt,RLC circuit containing a 50-W resistor, a 10-mF capacito,t)mkbek8gi 6 xg z7j9r, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a u4jrdhe7 ckv++i)n9bzv - m b5phase angle o-)e+7 brhbjnm4dz+u v95cki v f $40^{\circ}$ 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 2 /q+9wgqp, z.osjcxq= 200-mH, C = 10.0 mF. At what frequency should the circuit be drivenqjc.q/9zw+ gspx,q 2o in order 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 series circuit with 12.0 W resistak r8sevr;- 6ipnce, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connect-irp s v6rek8;ed 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 ana36f cz5rmbq,r3r 3e8 jy7oy q 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 of 60r+e+c 3am d5gv W and a resistance of 30 W. What is the po g3m5era++c vdwer 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 a 50-W resistor,.zi/b5p 5fs /lu+n9gyrnwrep6 * ihy; a 10-mF capacitor, and a 0.45-H inductor, when h6re9yr*5; n./+pp/iyw gi zsnufb5l 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 seriesasa*swzynj 7e zu..- *?wujy**.-a sn7z asz.e

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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 6t x-ej+ugy* jupu1 (gseries with a 4.7-mF capacitor for a resonant frequency of uu6eg+t gy-( ujxjp1*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 neeynrhi4mn 6w2j (y *wtn69p5y rded in series with a 3.7-mH inductor for a resonant frequency of 1006* 9h5jwp y2nr rynn64mwy(it 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 with a 3g (oj:cd( /hzt0-W resistor and a 40-mH cotdhgz:( cjo /(il if the resonant frequency of the circuit is to be 1000 Hz?

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