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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 e(,3d/nz r rp xkz(mf*hxcept

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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 ind) 9 one;5qdwjie u+p1cuction states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind yb k+mhv9n6n9ns j l++of change on the indu9lj+ snhn 9 b6vkn+m+yced $emf$, 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 wiret0rn26*t4 s gy**g, kbrfx25vv f pcdx produces what kind of c2cxgybg6v4f n,52*r*tvp rd*t 0sxfkhange 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 z5hfb n 7,t ytl79m.rcof wire produces what kind of change on the inducfm.t l,5 rtcb7hzyn97ed $emf$, 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 removedbm fp x4pgwa0ao; x /lxg.44a ad:)d1w from 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, thq7q,hp-4 .aleg- iebre direction of an induced current in a conductor will be that which tends to produce which of e lgaqh- q er7i.bp4,-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 z qfepeayxyw8 ww;.8m*94f2nheld above its center with its north pole pointi 82w.e4nfpxz;f*w 9yam8yewqng 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 horizontal tabo zoobww3nja , qpbw8)-;q*aiwcz.q 3:ru:0fle. A bar magnet is held above its center with its north pole pointing down, and released. As it approac;)qw:a rfa3onuo - .jc,ib*qo pb z8w3ww:zq0hes 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 magnetic field hl(ghy )n1yl3vector points strai g)hlyylh(n31ght up. The magnetic field vanishes 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 tabl xn*ej,wuzvp(( wus. * r83s zul.q83ebtvju9e top in a region where the magnetic field vector points straight up. 8tzj vz eswsvnrwx(uupu8qbu9 j. l,33e .(** The magnetic field 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 horizontal table top in a region where the magnetic fieln: i+bgi:xvoc.i.a *5iejv 9id points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this co:+9v ag*5jci no i.ii.v:b exiil 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-increasing 1h3rh3zty)ymb9p lv 35f)ma mcurrent northward. Two coils of wire lie flat on the table, one on either side of the wire. 33yayml) rmh)fhp b1vz 9mt35 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:vj+8 1ieqtfp r alc/ *bx6)rd with the north pole entering first. As the north poj)rxiq8p/t c +eb1 vdf6arl*:le enters the wire, 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 constant angular speec3z1.e ht4yle v li0t-d about an axis whose direction can be varied. In a region where a uniform magnetic field p3 - 4yc tevihz0le.1ltoints 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 an wgpwjcs7d1m o27 6bw, axis whose direction can be varied. In a region where a uniform ma7o w26wwm7jgs1b , cdpgnetic 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.qft3/ +q(dyio
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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 thaao txq. ag/h mod*-3j.c c,m5et 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 m47 f) b63b bbedl;vexwagnetic 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 (orien,0 pm*r eym1j 5rf-aynted in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a,y1mpfjae* yrn50 -mr 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 angular velocity psn)r9sxzeu19 o7a4h $\omega$ 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 trqk4uhnvzfext 00- x-)ansforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The fr.ojwn4rs5.3goi+vavr t j5m*equency of the jmr .3i sg5onw.*5rtvo4v+ aj$emf$ 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 devicsu ujz z+k6sg(:i0i v1e 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 thatq vv*id)op9: i

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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 prima , wtf;pags-(bry coil then it g(-fw; tbsp,ais 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 seconda38kg 65bkerk gry coil then i86 5kg3r gkkebt 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 inputh1lw3-pe6:gaqk9 poperr 39tsri9 * t

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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 resonac)o s8.ye5 a8d j9 71y4sqowil,tmejznt circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series t7* q5vpwm)av(veyq 7to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acrow 57 (e)7pmvavvtqq*yss 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 ideal batt95yu;+ s9yfsvpo,p * 5tgyt0,xtvyh rery of constan, tptry95y;yvg9txhoyf *s ,5+vus0 pt terminal voltage. At 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 ind t320v9rkaer il0mos+uctance 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 i+j9d(r1xo1ewz0i nrw nductance 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 ind77 *kki h: wqoywko0o53cl h7,s iep7kuctor are connected in series to a battery. The time constant for the circuit reprewk5se ophc y3k o0h:77, *qilo i7w7kksents 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 ::(6wb baf kbvbattery is suddenly removed from the circuit. The time constant for of tfb :ak:wbb6( vhe 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 havhh6-.xbux,hs . wakb- 2g aff2e the same 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 py (288v rz0rhzvcex.yx6liz3 ower 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 connected to an AC ps nwrz:*f*2o yower supply. In this circuit, the currenor* zwysf*:2n t

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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 whakbw8hfh5at vjn)j+ 0 tlw3 :i8t factor when the frequency is 5 l 8k0jfwb wh:t8nha+t) i3vjtripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, thw 8cdr u,a j988tpamx g/v4c5xe inductive reactan, ar49x88tc gjcpw8am/5uvxd ce 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 zeplomtn83 9,ue aq-ne8 ro, the inductive reactance of 8qp,-9to8a3 ee nnl umthat 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 powe huyd +qy+8l.ar supply. In this circuit, the curren uyq8a+hdy +l.t

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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 a*8mfg,o t 8r;+ djvafrc circuit changes by what factor when the frequency is tripled?vgff8*;r ra,+otd mj8

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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,q.ca,- 9 8i ro4v(rl0gskatgm the capacarrvq-o sigkt84m ,.(0alc9 gitive reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capay -6ywcr(c wk)citor in a RLC series cikw ywr c)-(y6crcuit?

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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 defined as (e:l 3r-pfnpca;s1 ze$\cos M = R/Z$, 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 ;vf56 x,xzy, xubgsj7u7:aj fimpedance of the circuit increases if R increases. When is this statement tx,7yjuax 5 j7vz:6xusg,ff ;b rue?

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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 increase up/ cx:knzwn l6fb:2eo/od4:s 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 cii mvuiu3frrzz 20 k-*tvjg0++)cq x,a rcuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both doubletmp*:2hcfhj7v.fy ( h in an LRC series circuit, the res: 7hh2.y*pfjvcm (hftonant 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 applied voltage. At reduaquvsvv:y6ry ( d2s 2 +l/)nsonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurqpi2 v0)jvzfyn) j: s-s when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.208e7w sc+(qb2do p h3tc T. Find the magnetic flup3e t8 qwdocb2h7( s+cx through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10wdbcdpge3/ 0zxj3;s1 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 magneps3; b/ewczd xdgj301 tic 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 radicls; j v/j1n.f0f*rucus 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when thflcfusnj;rj. * 0/vc1e plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduce xyr3) tbhc/kfka003l-i w5gid 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 co iuh/f .,nxoq- r9wl-qil changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 1mjdon4, t 0jrfo;szhrd/)5 l.8 cm. A uniform magnetic fnr5s ;lmt0d/z j4d,.fjr )o ohield 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 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 turn x2/7p lxeila:s and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and aretmx6i9 6s7pwya $0.20 \; m^{2}$ 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 flircr cj,/zphdyjl lg 9(p;0w;;es horizontally at a location where the downward component of the Earth's magnetic field isjzlrpchr/lg ;pw ;;ycj 9(,d 0 $6.0 \times 10^{-5} \; T$. 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 anp2 vxvvlk ./dey5 p)r,gular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant mag vx2rk.pdl,y)/vev5p netic 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-sectie4d57 ocpts4srt 43 5,d vpyeyonal 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 t s+il, mdw l+u/au5ggdww)lp2cl- (6uurns 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 onbqb sccp5 4g;xd7 +h*m 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 fieldp +qbhg* 7 cs45cxmb;d 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 a) eau+/m*u*4vyrmzm vrea $0.090 \; m^{2}$ 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 with an ouiva8p-dch:2laga-e 7hf4pv ( tput of 12 V maximum when rotated at 60 Hz. (da g c87-p2iel-4vahh:fvpa 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 generator with a0cfn85jzq7aw ob * i j2-pufl7e: f2xi 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 resistanceu:w h a1gw4;uu 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 resistance om4m18kgn- t9i)3+ x8t8ueimt bke cvnf 6.00 W. The motor operates on 120 V AC, and when runcvnttenm g+e m3-t1imkxi b84u)9 88kning at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power su f.87;qmf;9n pwj ret+vgqb( mpply. The operating current is 1.0 A. What is thempr.w(f +qe9 7 t8;vbjqmgnf; 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 )c,,/viqyek ; 2flkerto a 24-V power supply. The operating current is 1.0 A at full speed. cqy ki/)ve k,l,e fr;2 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. (xlo(c w fkxm:3arkgr.qnyy5 * sz6-w.x-uv-The operating current is 1.0 A mfnvor(zr -(x y5c.x-qysw a6u*kwgk3l :.-xat 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 ne+ w zf,,neadx8eded 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 tdk+86:s r+ znwg.vg zfbvl7;o ransformer causes 14 A to flow in the secondary. How many turns are in the secondar.vzg; f+6o: 8 gbnkzwsvd7l+ry?

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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 primar7i0a i z1xz/tqy if the 24-V secondary hqxti 710az /izas 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 consi+q ikt1 hmusq41y71 ahsts of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the+4 mhiuaq 1qsh7yt1k1 secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer.l .66.w ao/ e2l8 8nx;2zfld8iyxdb b qpt8bgi Assuming 100% efficiency, how many amps at 24 V can flow in tbia tz2/fbdlo l e8.w6lx6bd.x28g ;8 p8iy nqhe secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. T7;)8k u*rq wghn e2(itmshyc6b( 7ymehe primary coil operates on 120 V.yhb7cq g(ywm;)ntemi2k(* rues h 867 What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on . hi22 c0wmywwits secondary coil. If 120 V at 2.0 A isiyhc 2mw2.w w0 applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primvq os5p4ox6 a)ary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present insa6pq o xo)54v 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 anwmvn w,: m9jgc/k*x/ij2k 7e r bxg1r5d its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the seco5j *xvkm x/ 2c kgwg1jr,9mb7riw:n/endary 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 and its secondary has 200bcp1 ,u1sh 1cql5 w7vw turns. If the input voltage to the pc sl1p1c1,hbvuw 5w q7rimary 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 transd fbjo9t-:i+ ev v(mj4former has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power fem9dtvj:4i v(j-+o boutput 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 voltage iuy7wj drv )q.8wq ge(.s usually stepped up to 4500 V by djq 7.gw8e wuy) .qrv(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 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 curr/tbe + w0uipljl b;j18ent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power li lupb8wbj+0 l tjei1;/ne of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V 3my+je5e9pt 46kud jc. 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 percentage powup34jd6c y 5teme9k+jer lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A lp ksx z dckv14db,/m+i44hm, generator produces 100 V at 70 A. In order to reduce energy loss due tovxh+1l4zp,sk, kc idm/m bd44 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 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 total resistance of 0.60 W. Apt91-qsbz e cy0; ku*-(apn wa generator produces 100 V a1z -na9y- *skawtu p0 q(pebc;t 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 line9u 16hi 47rxi jnexf.l at 1000 V. How much less power would be lost if the power were transmitte7urx1ljfei.x 6 n 9h4id 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 i.r0j9z fz3oj0n e 9-drp5 6sr jfoo5iws to be transmitted on a line with resistance of 0.60 W. Tffso003re 9 dz.6i5njrp9 jo zw-j o5ro 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 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.y leta8 y,y60e0 A. How much energy is stored in the coil's magnetic a,6 80y yeytlefield?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. Whe3t7qvhy0 i nv9w,c0g at is this circuit's time cqy 3n eh90vg7tv,ci w0onstant?

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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 wh3f1 2spdz(, *kc,dbcix,tx ypere 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 1)9e0bby o)6(mo9 tx2qhsoh9g6he o zw20-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of the l,3aojwia(/x12w x -+i6 dfuww k,mzea amp6-wf/wwzx( ,aoi3e1xkma,j2+a uwid?

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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. What i 6-stlata2 h9uhy;yb:x1gn7 ts the peak current through the resist:2 x-;lhty 1 n6 tuyathas79bgor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is t;;l)c nhx1 8g/4xcl6ri.urzff j -rw khe power dissipated in tljgfhuz.fr6x)c l- ;i4r wx;c/n1k8rhe 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 50-83qhp+e r2 utqW resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-Wlmgyff-) f5 :go bo(g/ resistor 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 resistro4m 7-ktd*q wor 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-mH inductor at - aplc-avhg wwgi b4r +z+5w5,60 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. e-sd uqfd2b6,50-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 t8g d3ij p, q)mha-*47rufo,ydr lnm+.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 Hz?vl l+dt;xgu2ap)z 9x1

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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 ACym jvlzi.d )8- at a frequency of 20 kHz is appl i8lyj)z.vd -mied 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 cofn7/qiu lr74:trn: uqil 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 r3oq/wkr3 , fdqeactance 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 capacitive reactance a5i p3sx5r3igik4tkg8 5ahye0 t 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 1200 3pos7nh:k ic.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 capaci.o*td5sm)knpl7 k2iq n3u gv7tor be 100 W?q3i5kdn mt.)nv ul p *7o7g2ks

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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 cajx9 e yv-yyl +1wt0b;opacitor 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 sermq/o oi58y8hries circuit with 12.0 W resistance, 15.0 W inductive reactance, and /5mro8yo i hq810.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0tm-cc kchfx -y172b iu5jw3e6 x66a nh-mF capacitor arej m6chu65ay36i -cwkb-n c thfx1x2e7 connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 et7: e7n7u/t5 gs(w ai9ymtkgHz if a 100-W resistor, 20-mH coil, and 1.0-mF cap5 77seua79tik: ( /yegmngttw acitor 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 inductor, what izy 0 hb 426x,t3den2uaeyj3tms the impedance at 1 u3bh t6x32ze,a0ny4te2dyj m000 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 ab gq9 d:r dxlbe1: /v2fjk(o3bp (qcl7 20-mH inductor, what is the phase angle at blxqg72c1k:l o:beqp(vf/j d b9 3 rd(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 neejhh k0101 ia: u2m civ9c h1)oaadvw*lded in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1v2ahla0m c)aijhd1wc09ouh 1*:1 kv i500 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 ;vkk9hq0: fywvm ew6h6g.p , cresistor and 15-mH coil tok kym0c,vh hvg96 :fw 6w;ep.q get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in seri2o abl j;*9aezes with a 450-mH inductor at 5000 Hz for a total impe az *oj9aeb2l;dance 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 with a 100-kW resistor at 8cssgs4.- qz4rnhn +e1.0-MHz for a total impedance of 150 kWcn.8gnq z+r essh-4 4s?

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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 s9 xo8g 1sf,siueries with a 20-mF capacitor. What is the impedance at 1000 sg98is1o u,fx 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 needeoh fi9:ngxo s(6h;b/j d in series with a 10-mF capacitor at 1.0 kHz for a total impedanx6o:g/sfh9j b;n ohi(ce of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF cagavhi66tg w+ l 5el41bpacitor at 1.0 kHz for a phase anglthlve6 abg5 +l 16wi4ge 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 1.0 kHz for a tota+af(:x -s/hjjp nh yi2l impedance ofh2xa+jp n s /:j-ih(yf 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 seris) ul5; m*jimdes with a 100-mF capacitor at 120 Hz. What is the phase sm;* i5l u)jdmangle?

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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 zgiyzow401i-+ a ye* o)ufzi5and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serieifaoi*ie)+zyu4 z g0-o 15zwys?

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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 con+u8m-gbjx af1lp+f) vh acw:8sists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms currexhw)+a8ml +8j a-u: bfgpcvf1nt 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 of capacitiv /rfx+v2aqv2brsk)c 8 e reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz8rax bqvvr2s k )/+f2c power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resistwfqr04 3jh 8( eqh8 d(v/lvcwpor, a 10-mF capacit0dh8vle qj4cw (fvp/(3hw rq8or, 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 fo k7asbg g430lyd y9)azr a phase angle of7) z04ga9yas ldk3 ygb $40^{\circ}$ 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 mxc+y1 lb -hi-uF. At what frequency should the circuit be driven in order to have maximum powi1byx+ -lu ch-er 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*i giqb c ho)l+, mg67odq;,kgircuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to m*oq,7 ;6i)dgqh l i,+gkbc goa 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 amd)lw3do-uoo6u 5x 9 rn 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 haddwc0 sk3dx8 z a5u//ks an impedance of 60 W and a resistance of 30 W. What is the power facd/ dwua08/k3xzs 5dkctor?

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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 sep4 ssjy)sp4l /ries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H isypls ) 44pjs/nductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capa*emfuy3* tsp-et kjtk58i 9 m,citor and a 15-mH coil in series?s89,ep jttkt m*ke 3fyimu-*5

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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 lam)z-k 5; etvin series with a 4.7-mF capacitor for a resonant frequency of 10 kHz? -t5ela )k;zmv

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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 vf23utsq(oha x5;a6uk k3 sr23.7-mH inductor for a resonant frequency of 2a(5 af k2tvs6su; xk o3uqrh31000 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 placedw-s:g-q;x i8j4cz qgw in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is s-x-cj4z w wqqg8i ;g:to be 1000 Hz?

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