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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://autodiscover.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://autodiscover.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 flux8i s/m +qyw5fcovx1y. 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 svu i)ed /wo b7hs3oa7 h8 w6./xcl4giztates 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 g-f6gxkkbtjl 6wm a)j1 h3o49produces what kind of change on thejkx 6)a43kwj6 lg1g-9fhtomb 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 magnetic field through a loop oejli3 i,2j eu5f wire produces what kind of 5eilj 3euj,2ichange 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 7cw+o-45dqtqtykhu1of wire produces what kind of change on the induced tw1ho-cduy4kq57t q + $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magner)i m7a-i i jxn( he8vqh5jz5:tic 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, thf 2da2c*u v43r xzwua(e direction of an induced current in a conductor will be that which tends a3 (dxcz w2ru42*afuv to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flatpn:* di8ny-mqf46ata on a horizontal table. A bar magnet is held above its center with its north at m48y6-d ap:*qn infpole pointing 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 table. A6hz/pp9 so:lx bar magnet is held above its center with its north pole pointing down, and released. As 6p9xl o/h:pszit 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 xbbsc*)l lfc/zk.sp p ,* u66zregion where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of thespu6zp)b,x *kszc 6ll*c/. bf induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnpo zp( pa /t/vw4vaqd828)xgqetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induc ap wvt8 /dx8pq)q(o4a p2v/gzed 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 ijyx5s(o ty,. cxem(q-n a region where the magnetic field points straight down. The magnetic field diom x-jyqx.te y(5,sc(sappears suddenly. When 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 t:/vbeiwpb8yyzru /hqz, v:q) g7 (b4yable and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on eiqr/yb,yiuphe 7)/(: qzvyw4gzb8bv : ther side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a :,ucci r+ o2cwloop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed f:oiu,cr+ wcc2 rom above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about aa +kw2cc8( l/qn4ffzwn axis whose direct48fcnkca/lz2 qwwf(+ ion 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 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 isulmdt32 cft6(z a4cv . rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation 4favz. 32ct uc6(l mtdof 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.x85w zzlmz 44yv8 j z*i0kc5kg
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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 az5p.ff 0twgz v1 1b4aln $emf$ 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 magne5g(b xxit;s7k .bss-jtic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northward at c7rkw gy8 /up1fonstant velocity through a magnetic field that points straight down. Make a statement conck1 py8u7/grwf erning 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 angulax-iibagq+9b y yn0qb561e3 iar 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 transforms:0btdn7d ia+-l5c 0kozo 0ish(m8g s s

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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. The0j /ojhdk +y--f/v+0 vcyeud z frequency of thejdyo j-ky+0uv0-hzfd + c/e/ v $emf$ 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 dnl0q ni:ow (l:evice 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 devmg+)esj-yc1 riwvk/ 2ice 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 morre/l5wv :dek,v,ar 0fe loops than the primary coil then iv,lfdr :k/5v,w eear 0t 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 c0k q8ty3heg u9ontains more loops than the secondary coil then it is a9hqu3 e 8kt0yg

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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 power7r4x aq)nm f; r0yq1jssb)xj5 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 circs mzos(2m .4g3mziot( b(mr3ujwkt3 2 uit,

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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 w059lw(bk4zjlf *t hh:vo3 opare connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the batto wz:k9thj f 0plw h*l45(bvo3ery, 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 connectedk lemoui(s5m ag;o 946 in series to an ideal battery of constant terminal voltage. At the moment contact is made with the batter(94mlomk g6iu5a; so ey, 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 connected to a z8hildohtcu: : dta/wa6tvp8j;. j22n $emf$. 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 fx6fl(m2gx1f 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 inxcgz2op;w;1 8sajul0ductor are connected in series to a battery. The time constant for the circuit represents the time required for the curreazc j 2;o ;s1gx80lupwnt 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 b +b 8g7yu0ngcizn; ca7ha+vc4attery is suddenly removed from the circuit. The timgn0ycghi7;+z48ac +vnba cu7e constant for 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 ex,drvb3(4m3rmdq kxb:4vdot,e /0uod cept:

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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 thnlpv 0 *j+lfqjrf* o9hk3-w5jis 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/*pufk ,w .wpffy+o 0monnected to an AC power supply. In this circuit, the currentw/.wfpom0, f ykf*pu+

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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 737w9slfhrz 5clh2o5pxw ww pb+ 4 y.pthe frequency is 7 zws5ollwh .xh +cy3592pwwrp4bp7ftripled?

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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 induct, k x*x6kr cbx5w4 3xc1)s+smmtreqp: or is doubled, the inductive reactx1,+m )*re c pbsmq:4x 6 kcwk5xx3rstance 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 zu4cjps6a: qv5ero, the inductive reactan sv j:up45qca6ce 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 t.l0l4p ;kaqj*6a j mq/fr+nmnjd;* wjyod:,jo an AC power supply. In this circuit, the curre6ynral jd+f,*0qmjj4*ow /a l ;dmkqj .:jp;nnt

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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-b m ug-+j.isorcuit changes by what factor when the frequency is trib- m+-ugs.ji opled?

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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+aory8;wzz7:tf sds * voltage across a capacitor approaches zero, the capacitive reactance of that capac7swz8 ord*;zafyt+ s:itor

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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 igsr5 (jxe j3(dnductor and capacitor in a RLC series circuit53er d(j s(xgj?

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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 defin(m(w2mj ktxl( ed 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 impedanc :aw/j)gm kxg.e of the circuit increases if R increases. When is this statemen: .k x)awm/ggjt true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit incg,a q2 f7npvi6reases 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 increase raluq 9i:2d-md c1uq 0u,0gzgs 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 r x/o 0q+ vq,iwakr/9sin an LRC series circuit, the resonant fre xwq0qr 9/ak+ovs ri,/quency 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 drx.ye640l xyasqs8 dt 6iven 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 circuit occ 1y:yd)a zp5 ddft(4vuurs 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 0tfl;s;y)pd2t6 tv3.u; nnpj x.10 m is rotating in a uniform magnetic field of 0.20 Tp)3t u 6n2ly tfs;nj.;xvtpd ;. Find the magnetic flux 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 0.10 m is rotating in a uniform magnetic field of 0bxc9p.b/r y( fqxbts y1l2 q(3 cm;+vg.20 T. Find the magnetic flux through the loop when the plane c f31vsb9bpxm(r +cyt2 / l;gxbyq. (qof the loop and the magnetic 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 is rotating in a uniform magnetic field of 0.2jv,ve; tpbyjn; -b1-tbdu 4c1 0 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fip;-,en4cdvub-1j; jt y bvb t1eld 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 muo 2imd6yxmmi5 4-8cof an 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 coi.vckf k67y4lll 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 20yci 0 tua y--h7aze+c10 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field c0 z c1uy-y+e-aat7ci hhanges 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 turns and an areai;/dz) fbbl5 xefxw56 ad 9su9 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 areapg ak3yf7.4 lq $0.20 \; m^{2}$ 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 fliej2c)n8pec/c n2gjo.hr l 5) 9bihz/h es horizontally at a location where the downward component of the Earth's magnetic fichezc nr2pog)c 9/ijln5. /j hb8e)h2eld 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 constanq 7qkb0rnge 2r88b.put angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnet2bkg.n07erp8 qqurb 8ic 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 li 0,qrvebgu:0oops 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 turns of wire of ak5:fukgpe 3qlpqy7v;i9 c( r/ rea $0.090 \; m^{2}$ 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. Eah ;a397hl i3 nz8m)y5ec5yqbap kg1ll ch loop is 12 cm lone3 zyy3a g8l5h )kq1;m759cn lhbaiplg 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 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 ofek)t9 :d fzwothp+q 2 j4lx90dh lp,c1 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 simple AC genera.h9uhjz econ3crp :) 1tor with an output of 12 V maximum when rotated at 60 Hz. A magnetic fiel3rc9 e.zcon hhu:p )1jd 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 genera 5*t:qzsp-:feq)c fmmtor 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 6.0thr.15 nv:jfoip6do g4;3r je0 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 of / tbhs-c k01+wdafbct+0u2 eq6.00 W. The motor operates on 120 V AC, and whe1t/w0ekccb sf+-2qabd0 u+ht n running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. eq/.njg rxkw69- p5ef The operating current is 1.0 A. Whatg6rk9.5fw/ e-xnjp eq is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power suyy0:z(ckl xy,ec3u3 wpply. The operating current is 1.0 A at full speed. Wh3y,0c w zc(3xy: ukyleat 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.un g r;49:.ngu:ftg4g he(opd0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed:nu(neg gg;4r4p g9:u htdof.. 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 aep. c,;xvxb0u u 9,rog 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 ab ff4uddt dgwrn(:nxw (- j220 transformer causes 14 A to flow in the secondary. How many turns are in the seconddjwx0d( nwr 22b-td(nf u 4f:gary?

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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 primh ,fka 5,uaus3e1w/ wax* uh2cary if the 24-V secondarhw 1x,uaesa uu532hkwc/ * f,ay 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 an691kc h x37;zzgdk ppjd a 2000-turn secondary coil.p6 cj;z 1zk9ghx3dp7k If the current in the 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 trexe7) gwn4fhv .o)ctevj i/, g i5(x-wansformer. Assuming 100% efficiency, how many amps at 24 V can flow in the second,4e-5chg)xfei7gevv. j t/( wn )iowxary?

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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 Vszyg;4 ezk( 1gk62p4p 0x8ruj np5j nu at 10.0 mA. The primary coil operates on 120 V. What does kjegz64u (8u4ks2prjpng0n ; yx15pzthe 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 tto 1tldmwmf 6hgh*7)l-5 8 yd x1.hdkwurns on its primary coil and 300 turns on its secondary coil. If 120 V at 1 d7*w1h kwmlmthy6d8o df xtlh.5g)-2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil andw b 5omd o+d*7;sglr1z 300 turns on its secondary coil. If 120 V at 2.0 zwod ldb5sg;r +1om7*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 traokspo n+-miqy(4 +roxl9e3b ;nsformer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondar eo9boxiqpk+ ;-n+ ro4(3smyly 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 200 turns. vm 1 6wfhjql36 If the input voltage to the prima6vj631hlqfw mry 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 sec)tcw,0 imcyi/pq- s63y9j w feondary has 200 turns. If the power input to the primc)9- sei jic /0wfq,ym 3ypwt6ary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current az5wkygk k l4b4v/ s)zfrx503w t 120 V. The voltage is usually stepped up to 4500 V by a transfb5kswwrg5 0fl/ kx3 4zv)4kyzormer 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 currenidg;hg)z j un5;iw5 m ef(,1wvt at 120 V. The voltage is usually stepped up to 4500 V by a transformj,d;1fh 5 u5nievz gmwg;()iwer and transmitted through a power line 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 0j0d e21 k bhs-su;xowat 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total ru-;xjoh0e wd02s1b ksesistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a tetm36b8( t xkwotal 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 w ( 3t6b8mtxekwith 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 ; k/d4p 2kdjusresistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due ;p/ks24ujddk 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*k4 mv2 i) a)qwwrle30nfn: km 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 30n q mw3emlr )ak2fw0): ivk4n*00 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 Acx t :j2f(wxrf )k1t1e mn+qp.. It is to be transmitted on a line with resistance opr1cnqe: x2w(tff1 .t+ x jm)kf 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 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 ec pw6f34 gyn203ozpmi ; i1ebis stored in the coil's picopg 6 e1yb4ne2;i30w3mfzmagnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor anbyk0 oxzii*) w nfd5 2y*nw,;rd an 18-H inductor. What is this circuit's tik n*; wozn)w2y x i5rf*0,ydbime constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where thi+ u0kj3qm )xhe 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 0dfd:7iic7v- eimz4n 15p po*ra7 dua 120-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 hext.no 5v,rpx o.f5d *et5/finto a 120-V AC outlet. What is the resistance of the lamth 5xe,/npe ro.dt55 f ox*fv.p?

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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. Whatsj f90c;hgxe u*nq,6z. xf i-k is the peak current through 90z h.q6*xsugj k-x fe;ic,nf 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 ac power supply. What ig9k.khzohe+k:i * a6g s the power dissipated in the rekg +:9ohia.zk6 hgk*e sistor?

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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 isv5yadq/oxm,5dy ov+r3(bxc )d;lh ,s $I = 0.80 \sin (240 t)$. 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 isy:n(.axt fux dtr2)k6pu3 4 nk $I = 0.80 \sin (240 t)$. 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 resistor is jnw 7ye ;+l9kxm4p1mug3yj 86igtreqyb 02-l $I = 0.80 \sin (240 t)$. 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 60 Hz u4 85gv si*zb/kp2mdu?

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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 100 v:r nd+w+v/t)cvyi0 z0 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 1f0f9dx)mr qqom: 1c3g7y hk .e4.0-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 atx8h l a,-nnps-os.kkl7m+y f1 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 inductor wzyhy ;qjkw)m4) 4j0t shen 120 V AC at a frequency of 20 kHz is appkj4q y0wz s)t;jy4h) mlied 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 2.50-6lsub. j ,7pzub2oxl; -tm-pomH 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 reactance of a 4.k efd2v7f (0tkf, 3txq7-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 ar/8gqn / - qx,)ffz1 quvp 9lto:dpt4reactance 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 aw72sdlr+tatjfvv8 :i m h994 a 10-mF capacitor have 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 react fq+g 5zxhrti 66.9rvaance of a 0.010-mF capacitor be 100 W+vfz.t66qiah r rx5 9g?

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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 capacit.,g asclf+4h.8tnno cor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 lsvt8 ,, dp w3;y)zdfkch(c e6W resistance, 15.0 W inductivedy hwsl()k f6;vdzc8p,t c,3e reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coill,o4 ytwhv48f +wb/ ru-s,pb a, and 1.0-m8sy/-bw4 fu ,t+bor a,hw4lv pF capacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 H-*jq 6 es+defzz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected i*eze6q fd-+ sjn series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is g(s1,se mao6k g7ft2 ythe imped mks2(6e gos,1at7gy fance 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, i :5l nkj+ei5rwhat is the phase 5:n e jir5i+lkangle 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 20-md3v w3t kura5sk:5bw8 4xc)lpH coil and 1.0-mF capacito:4k 8kcutdl3w) axw vrp55b s3r 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 series with a 100-Wyszfy-x f -j7 oh6(x()lr wv5t resistor and 15-mH coil to get a total impedance ofzxrv)hxsfyw7 --o( (j6 t5l yf 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 4r dg 3txc-gg-250-mH inductor at 5000 Hz for a total impedancr-x 2gtg3dc -ge 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 1.0-MHz fo(bnq 5lnz7+msr a total impedance of 150b(+7 n5ml nsqz 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 capac tzi5n;.ls p-witor. What is the impedawl ;.5-zt spnince 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 ( g i:gutqc).wwith a 10-mF capacitor at 1.0 kHz for a total impedan.tu g(g :c)iwqce 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 new9v*13noecbl eded in series with a 10-mF capacitor at 1.0 kHz for a phase an9vl3cnw *e1b ogle 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 re1xfgfkn f -o51sistor at 1.0 kHz for a total impedance-fo1x5 ng kf1f 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. +bi- bf2lf+ l1xv3qh e What is the phase angleb 13qlff ivh++2bx-el?

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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-qwt 3 :4ku0rqimH coil, and 1.0-mF capacitor are c 0qw:ki 4uqr3tonnected 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 10-eq8lpk2x :zjjh4)c bbx28 nh0-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60- zej) 2k8ncj8hp lhb42xq: bx-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 capacitor of capacitive reactance 30 W, anduhm7z 6a oa28d an inductor of inductive reactance 30 W ared au6hom8a7 z2 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 fo a.f.r+rczibl9e)u6 a r a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, l)fuiac b9.zrra+6.ewhen 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 seric 5x3 cs)qxk3axd0si4es with a 500-W resistor for a phase angle of c x xdss3)30kq c54ixa$40^{\circ}$ 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 = 10.0ag j/cd5;zjt f66 hkdp o8/(uz mF. At what frequency should the circuit be driven in order to have maximum power (kctj o5zd;6 86h/g/z dpfajutransferred 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 witd4hxtcx,6/f qh 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitivh6tcq df/4xx, e reactance, 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 circuit is cjs y8 -l1eyeah)gzai.949pv$63^{\circ}$. 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 ie7hd(ti)li njl1 f7k pheov0 4r ,*w+xmpedance of 60 W and a resistance of 30 W. What is the power facthr*4vk lx,7f oni0dpj+ wl )7ee1hi(t or?

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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 resists / jfjltc+ )avs ,g0,uq5koq3or, a 10-mFjqs+3s,oflv, gkjq) /a t5 cu0 capacitor, 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 frequency of a 1.0-mF capacitor and a 15- ))jhq)wv poh3mH coil in series? wjq3ohh)p) )v

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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 wit09q(32uu buvng6 fjp nh a 4.7-mF capacitor for a resonant frequency of 10 nn3qu92 buju(gv60 pfkHz?

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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 3.7-mH inductor for a resonancjb dkhb/n5,eksk; 1z.:gx d)t frequency of 1000j:;gn, d5)czb1ske.bkxdkh / 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 placeu5yp58l5 hrh7o -l srmd in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the -5mh 7yl5hl8uro p5rscircuit is to be 1000 Hz?

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