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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 magnetic flux exce+ modj3 ckx,ax7:hn4ipt

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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 stateslz*:mxh aim ,l vj c575rff4h* 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 iq vu0y;g+nzpuv/+ps 5n a coil produces what kind of change on the +qpu5 yzs +u/v;g 0npvinduced $emf$, 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 magnetico rjck5wdn;e3 0wnc,+ field through a loop of wire produces what kind of change onc j;,w +0rknow5cd3 ne 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 produces what kind of change ri v7i:)emug:on the inducerue7: mvg :)iid $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field aen0f b3 drt*xgp7ww-9n $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conductiqp7ty8zh z 6kn 2ad;uxx;y3 3or will be that which tends to produce which of ; 8uxynkq ta hipz2; yxz63d37the 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:lxh /k2my bx igee84y-d 6:( .jpeqly above its center with its north pole pointing down. The stationary magnet induces (wh24xbh e:ypmdlye-8xkj( /qy: .6lgieen 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 tablyhcpbe1ki :9 ad;y5wp*pmi *3e. A bar magnet is held above its center with its north pole pointing down, and released. As it approache py *95pi1 :ekh 3ybmiwp*a;dcs 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 v/ f3*pzd lpp(cector points straight up. The magn*c3d/ zp (fplpetic 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 table top ivr dx; ez4xdk-n k497y ey*ch0n a region where the magnetic field vector points stde h7vd- k4xnr0ez;k*9 ycx 4yraight up. 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 q x6srgd7*q+smagnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the dire+x 7qgrqds* s6ction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-i;o6esi5j r4u lncreasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. Whieol5su6; jr 4en 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 en9 ta(wl1gqk5 vul. n0sg3-pjptering first. As the north pole enters the wire, the induced current will be (as viewed frqvn g w jgtkppu1.09as3ll- 5(om 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 co017 npcddnr y,nstant 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 of the loop's axis of rotation if, y p7rc01nndd 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 air db jt2 t-6t) m3zc**so0twyxis whose direction 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 induc)mttb jr 6yi3 zd*c sw*o0t2-ted $emf$ 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.5 g tk;bt x tgm;zn106o82mn d-u+h*is-chu kd
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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 a 2gjm:jdba3 r/-xwp) hn $emf$ 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 magnetiwcte 7ctex4*qo e,jucy:7+y7 *; wotm c 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 (orient/ j cpztb ,r eo)v/;gk*sqi/f+ed in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement g to/zck rp*,b s/q/e+f ;)jviconcerning 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 angularz g;:ao): u fdx;xjnz0dm7( /eulmm3s 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 twgcu ,)b av).dransforms

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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 throq *lz,if mwsj77ur+3p/z+ox i ugh 60 revolutions each second. The frequency of th7uzj*+3 ixqr 7/wf mplz+,soi e $emf$ 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 de0514juo 4xizt4hevzb8zr 3nd vice 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 dia2qy6 2ep.3mpnlk*l evice 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 more loops than the primary c fkn4s,j/ :krioil then it i,4k/jnrs i k:fs 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 loosas.y3;,r*;c qd*c dmwqr g e3/ye/h xps than the secondary coil then3 ,/cmcqdh.*eaq x*r3yde gw/;s;ysr it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power in wk+y+;im dj:kfg-8guput

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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 circuit2g7tpyln( 0pn ,

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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 ideals2pwcd z;6e9 ai)t r3l battery of constant terminal voltage. At t apr 29zsw)6ec;l3id the moment contact is made with 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 ideal battery of consta 2oiq: d jio7t k7rq3oxx24s;ik2k (ocnt terminal voltage2:q kr2t (4sxii o;cokokxjqi7 7do32. 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 inductance L and resoi*6c2/,s)nq;xs z mkze6msnistance 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 invh4ofkj g-khv)x eg2 5w21z. .uc4bbsductance 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 atdu5 s7 vyn v82v3smw+re connected in series to a battery. The time constant for the circuit r+tvd7s3m y8s wnuv25vepresents 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 co g*6vljftp +g5y6,ihlnnected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit ri,g lpj5lyt*v+h gf6 6epresents 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 unitssyo + p 1 3jabznr51)ba8c3nsd 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 this circuit, the cswuxxesj 62:wbz*1of;f k9(purrent

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, theu6,)mjlv vk8j current6j,mkv 8) vulj

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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 f -9ozu:d gt1hsjpkb)* actor when the frequen:s9h*pkgjo)zdbu- 1tcy is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is vw + cd8u44wenb 31lgqdoubled, the inductive reactance of 4 3qdl +v8 eugb4cww1nthat 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 ibxu5co9g3+pq k /*atg, owch8nductor approaches zero, the induco,t8a b 3g w kpochu9gq/x5*c+tive reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In tq c a5h:nt8;zhhis circuit, the currenqczt8h:n ha;5 t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive react2tmm4z 5bv t crc g,3p6fm +)dgwj6jw+ance in an ac circuit changes by what factor when the frequency g6 p+,vw+ 45 gmctc)z62dmt jj3rmbw fis 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 tl4 s1fm2bax2sy1wnf * 3+ijcaz8gq5(js9oo v he AC voltage across a capacitor approaches zero, the capacitive reactance of that capxfv5q(*s iojf+ 2sjao s w98zb3n2a g4l1c1 myacitor

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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 capacitln o rfz/595lnor in a RLC series circuinfzoln /95 lr5t?

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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 def afr ,yc-dn b+m.kf)*jined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit in51 :fiom-z wlr n,:gvmhlc4+ ycreases if R increases. Whe ron+m zmf:lg-wh cli4v,y: 51n is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impeyesv(*4dut4h 8k +yl aolza.,dance 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 impe )iiuofq o806s(7k 2j5 cinikddance 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 bothnx: 9psxxx sw pctu: vdx4)d3i99f,u 0 double in an LRC series circuit, the resonant frequency oudfx:9s,x x w 0pp3sx:vt994nc dix )uf 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 r lxn fsum2+-q1esonance,

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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 occur zm .cg39 (n msg:ceblh4zi32ts 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 ro uli90m61lqm u04m:s nsonz(ktating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loopu09ln 1 4msmmznl(6:uoi k sq0 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 r b(kei+/zh ex+adius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and x h +(b+k/eziethe 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.ksd7lgco(je8 *3j-zwk ,mpqv 0 o *v-a10 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 okwq3l0o7 k,md -e(gjp a*-jvz 8c*vs 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 selth-dvqn aa kq0xg,+g+8) a7ingle 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 cl *rqv /okoz 7ov((-t //susxroil 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 18 cm. Ak- l1 fw2tgbdvkt,u+ 1 uniform magnetic field is applied perpendiculg1 kb f+twl2vt,-1 kudar 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 turns and an area ofz54kp 2e1v jna: +nsw7n a-juh $0.40 \; m^{2}$ 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 and664 eb17nglbexo7zcq 5uvn+pm tlv3, area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies hori;:7tc;gbvve5te+ xc q 3+/:swfw qjlz zontally at a location where the downward component of the Earth's magnetis: fee5q3;; c :+ vx7tlwzt+jv bcwg/qc field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a consta*tu3u qy,qgc4x/ dce .nt angular velocity of 2.0 rad/s about a vertical axis through one of ituq*.cxq e dy,g/34tc us ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops a34moycul uz +r9x7* msnd 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 1*3chfu q m17s,cum6yq 00 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 lrz up*yx1tf,z: 6p.pmoop 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 rotatip.6pf,z um*ytr x1zp:on, 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 area ywa( u/3qiiphc-eqg8y/0sc . $0.090 \; m^{2}$ 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 genge1vqi1- uu 49gvn -9, 6getyznacl5zerator with an output of 12 V maximum when rotated at 60 Hz. A magnetic fiel- g,evyge u4nz v gaq1l1-6zc u599itnd 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 generafh anrjmm/) f)yr36w (tor 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 6.004b2dic- pzkq7) f34 tyd ml0ul 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 6.004 z)i.yn dru g8a;a vbaqiu590 W. The motor operates on 120 V AC, and when running at full speed it generaya8zg;0).vai5rn 4ibduu 9aqtes 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 ;r vo bo.8o87 jufrj33tuz.e7uz) enh supply. The operating current is 1.0 o 33fo urjzj7ev houu8eznbt.;).7r8A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power suppl.+mwmvp0v0 m hy. The operatin.mv+ hv0mw mp0g current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is conn9+*c7k-dlo3m2 j0jlxhaawb 0hyv o 4dected to a 24-V power supply. The operatin9 hj3ak24y al 0ml* +ov0djhb-dox7 cwg current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed tkb.+ qa+h-c)d qj5f zjo reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to fv c u,3jd 0n2itua)55y*ka+ .urowynrlow in the secondary. How my2w35 vy+u*ik0,uncr.o 5 )nt darju aany turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns ar ;kzj g;0skxp-e necessary in a 110-V primary if the 24-V secosg;0p- kjzx; kndary 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 and a 2000-turn secondary wl. ebqt :3oq.3 c:gud lxn.sst0g.h,coil. ol.:b ecgqtus dhq ,l ..gts3x .0:n3wIf 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 transwqe1f c )b4(moformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondmoc41( ewq) bfary?

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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 providesc/ 7 rndc/,pczz7fxi0 7500 V at 10.0 mA. The p,c/ccxzd7n7/rfiz0 p rimary coil operates on 120 V. 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 3 uxx(u vt5j.-wf1igp 900 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what (vi9ptguxf 5j1 .-xw uvoltage 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 tur tp f j4yuk5ld9td;t-(ns on its primary coil and 300 turns on its secondary ctudtpy4 5d k9jf(l;-toil. If 120 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 transformero,z+ rfa0y8 dl8lr 3z2 geji2bx ;pax);og2hn 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 seconjoofe80r d) yr, 2;gz2a8 iaplg x;b3xh 2lzn+dary 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 tud3 -fdsm y z(xh-.ytg8rns. If the input vol t-ds(8xyz 3h-.gmyd ftage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turo t.eru1uv0 1xn(d6nru,2uv j ns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional lov(j u.u,0n1 2trdru vx o1en6usses)

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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 u9bv ta a2)wu;hsx l6*120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 tuxa*luw2a9b)ut h s; v6rns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 Vhy9ymo-c0o9d(fy-6;x r bhm0a2dw yk . 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 percentagdkyc -9m0920yywyxh-rhd6; m (boafoe 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 volzma f03t0vq:btage 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 power lost in the transmission line if the voltage is not stepped up fvt3z q00bm:a.

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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 8pf ws8a,wl2fkv1sj 2km long 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. Wssf 82fwpj,1 ka v82lwhat 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 re 4ld-cm1ek/ tdsistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due 4t/ m-dd1lcekto heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less pog,prgq4p*5t-n-*+ on vns yk gig8q, vwer would be lost if the power were transm-8gg ,4v* yqg5+n*poqt-vrp , igksnnitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is t 07but1q+oo; i f)abo ihmfe51o 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 thet;ffhoomb 0 ibou i157a )1eq+ 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 a:l+ jv5.eqerz1o kskh( y73jis stored in the coil's magnetic fjlk.(ry1ehoze7 k3:j5s+avq ield?

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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 resistf pbzh2/7r 9suor and an 18-H inductor. What is this circuit's time conr27s/h pbf z9ustant?

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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 voltag3tpv syb :ve,ij kzf)15 u.w;vm9loo5e in an AC circuit 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 peay: -n0eqh vcp3k 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 iz 4)nsyo.)eav 8o:jixnto a 120-V AC outlet. What is the resistance of the lamzve)j :osnyo .4a i8)xp?

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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 i4neq 3g3eij4supply. What is the peak current throug e i4gei43nq3jh 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 tahlm04b.csm i0z +o :ko a 120-V ac power supply. What is the power dissipated in the resisloimhmsk4+.b0az c 0 :tor?

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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 i/q kphwno)- +)czkw-p 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 resistom 6mudfm+n 9kvwo7m76r 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 resistor i8e8 : hrawe a-8))jc**pgpenyirg e q7s $I = 0.80 \sin (240 t)$. 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 12ux:a*h,hg7-m2ww ofkb:tbc 5so3 oy .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 re+d bj9878omi nb(5nr yyivh)0 k/z fr:cf d:qlactance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil havxlhc 1* k*rx6h+mzm:pe 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 nepro,2b /k w3brcessary for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC a kl-6xr re5+8xnjs-dit a frequency of 20 kHz is ap+lrekrdjxn8-ix s - 56plied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to s--z 1lta;zq(f z;ikm /dw lco+tyt/*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 capacit1 8/n1oct7yvz0 uvqx oor 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 react)wb.wm,xk 3 ptance 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 doev:4drg646 xvi( afybd (g/ulnxakf,: s 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 reac4zehj,- pok0wc2yj7 97 u z/gzmag di)tance of a 0.010-mF capacitor be 100 W?7hd4-a zko jypzj ,m zuc29/i)07ge wg

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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 o c6p ak/z64/4n as 0doiny4ypHz 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 W resistance, 15.0 W if *jj3y9os5,dbmuvp ) nductive reactance, and 10u ,)d*s9op5fmj bv yj3.0 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 impedan/0atu x,-shg yce at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serieshu y,g0 ax/t-s?

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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 azopil3r t.(x/ 100-W resistor, 20-mH coil, and 1.0-mF capacito /t3oi.lrpz (xr 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 iej:lr1; n7t/gk un pi9qux .1ynductor, what is the impedance axq/rnj;e97 n11 k p: u.tgiyult 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 inducto6zv6mq 1 g /c4kmaiebq/u6+p vr, what is the phase angle at 100m 1k6 vp/6qq/mav +cib zu46eg0 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 serpk.6bl uulvm ara;*,j 0/f kh d9nd qb,kr01n)ies circuit with a 20-mH coil and 1.0-mF capacitor for a total 1 nud, akl kfn) ldmr0hqraj. bvk,b0;/p9 *u6impedance 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 ck cd lls 7+m50065 v*( xpjgvsgk:sbzjapacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance o m*6: 5s ss+kpz5gxjvg0bc dv7kl(0jlf 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-q j(.isbgb9r8 mH inductor at 5000 Hz for a total impedance of 400.(8br gjsqbi9 00 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 :c ;;uk3mg4exmkwz-6 brz 5bsa 100-kW resistor at 1.0-MHz for a total ib3 e;4grb k; xzczkmw-: su56mmpedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. W,)0kw5shh r b/exub.v q (7gszhat is the impedance at 1000 k5 vb0h wb/gssq)euh ,rz.(x7 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 ig.cipwqj+351s:.sey,nzc + qv r ci8 in series with a 10-mF capacitor at 1.0 kHz for a total impeq3iijcie8r c swq+1,z5pn+gv y .:.cs dance 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-mFc.uf7x(h u( *i- xauvjkpb6;m capacitor at 1.0 kHz for a phase *xp ucku x.vu-ami(j f7bh;6(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 wi/c(ygxshvn+2 th a 30-W resistor at 1.0 kHz for a total impedance o2(snxc / v+gyhf 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. What is theh*qd;d9; jigoft ms.6 .bgqo5 phase a;h .so9 qgd; b.tgd*qi6mj5ofngle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 13ge:)fzs31d tu viv g,.0-mF capacitor are connected in gi1d, :tg v)usz ve33fseries?

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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-nlfr 7r-;cz)mmi iyu)ot+7 u, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz p) c+rmyi unr)mz--o;fti 7lu7 ower 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 capacitor5g4 mxiug *, ft75nhxz of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. Whaxx75zg inu4hgfm *,5tt 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 rq1mwh:-nu z vf8*:q9iwtasj-esistor, a 10-mF capacitor, amz-j9uqfv: tsnw q-ahi*w18:nd 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 phase anglezhks9ylb,o 7xc,i g b )a:8*fr of: rk7y )bil8ax,zgf*h, cb9so $40^{\circ}$ 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*,y tr0 -rv;v 1obpoxi W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order 0 br ,*r-o;vo1txivpyto 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 circui7- qq3z9m-krpce9m:a e8 y wnft with 12.0 W resistance, 15.0 W inductive reactance, and 10me-y: w n9ac83 zrkmfqeqp 9-7.0 W capacitive 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 ci0qk xs7nvh11 wrcuit 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 imvvur .5ej73 /6jpgpyhpedance of 60 W and a resistance of 30 W. What is the power.h7ju p6egy pj35 rv/v 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 con 6hpxel y lhm7v+;1gq2taining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductge qmxlhyv1h67 l2 ;+por, 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-mH co9ck0.l c .txa- m)y)wmbwqdm: il in series?l-m0k9b: . ycw)qawxm.cm d)t

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a )q ztvqt7c z/bohfg), pc8.v-4.7-mF capacitor for a resonant freque,ctvv 7hp./t-f qz 8cz)bog)qncy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is neededxfuj8mtoe43;v 3d p(e in series with a 3.7-mH inductor for a resonant frequency ofpe;xo(d4e u vjt338f m 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-mH co*ignkux 5 uv +q6d,a:z5sa-,bvr bbl*il if buagak- nd*lv: rxub5qi+s *5,6,bvz the resonant frequency of the circuit is to be 1000 Hz?

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