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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 o;x f/9/a0ccut7j 9rwne9r fpkf magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states /gb 5pvjqljbty14l 62that 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 in1vda lza/q/g od u61h1 a coil produces what kind of change on thzo /hua 1d61vaqg1d/ le 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 of wire produces whatc (nr iu -fo;1*hsbi ,/xf;jdg kind of change on the ij/x-; fdo cs 1 ngufrh,i(;*ibnduced $emf$, 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 , *ymrr8/zl z8 npjcr5produces what kind of change on the indunjc 8z r/z5rmlp yr*8,ced $emf$, 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 maga8/gao ud*4ie netic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a 0e+e(tm:+yv / xkjcqgconductor will be that which tends to produce which of the following e jycm (g+kqt 0ev:+ex/ffects?

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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 a n-s0+pueir 3vbove its center with its north pole pointing down. The stationary magnet induces (whu -n0 esir+3pven 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 ca49m5j lhsgb +6u7yehorizontal table. A bar magnet is held above its center with its norg7umjy9s5heb4 6 + lacth pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a reg.)i bvqi0)hucion where the magnetic field vector points straight up. The 0hi)vbcq iu ).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 table top vov7aq n e,(.wf*c yf6in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction.fca eqn(o v,*vwy7f6 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 nzl2 c*2udo5xmagnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direct5uzon2xc dl2 *ion 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 li* zn6(uuh4uhs 0orp6mes on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the tao hs*h6 zrupm6(u4u0n ble, one on either 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 loop of wire with the north pole e /kna//(qum.fl iv4s:1m6 a/wdaxqnuntering first. As the north pole enters the wire, /mni1 s6.qd/qka4alv nw f m/xua:(u/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 spsi1*b5:5b-br xjra lleed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight drx5ia bjr b5sl:*b1 -lown, 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 wire7zfv1 k +pr:tl8f0 vwl is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, whz kl vr87f+vwp:lft01at 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.l+xn:5*awev)3f sc c n
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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 1zls+ 6zx e(0ajsk2 jhj k,v(nan $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic faexk n+hprf+q*; /pqx-d0 ya *ield. 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 ct f ,efrm)3es)4 f.)rsfzlj4 northward at constant velocity through a ma c.)43ler mfff)ss)ezf,4 rtjgnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular velocity sek 1d34uh- qk$\omega$ 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 tra bidp9dzva/8uw - p5l.nsforms

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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 revolutv p/0mv7k.47 lofri ltions each second. The frequency of the /pf7 mlltk4o .v0i7vr$emf$ 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 devi60:g1bj-vysi p -cnhnnh/ rj,ce 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 tc)lc )- snr./0nmgh khhat

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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 b ei5+ybry95wd kjhkxa;m;+)7*iud cmore loops than the primary coil then it is9yik;b+*hybjrec75d +k m; aw dxu)i5 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 loop:yxhl2v ks5:i s than the secondary coil then i x:hkiy lsv:52t 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 inpp( -;sz,d qywaut

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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 ug r5bkkru5*6pdb n,* 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 to an in rjv)o3 )c)ncdeal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across 3))r cj co)nvnthe 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 6xgfpv21r/y7bc3(1rqz wa jc of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inducy7rparc11( q3fvwjz /6 2xgb ctor 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 Lr zd y7,1u(5ejez:bqpdm) cto/ow *8u 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 inductancwl 9q e 4ywk.j) zx.1itpk2hz:e L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. Thjio-/p rmtf r4w+1 pbmpr7p2r/*u:c ve time constant for the circuit represents the timemr:juco+tpmr-2p wpp/* r i/741v bfr required for the current to reach

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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 con-r*pm:v l df;ynected in series to a battery. The battery is suddenly removed fro vlymd -*:fr;pm the circuit. The time 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 excep aw-ogt4 j,1oqt:

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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 sbp;ei(6ty-pzfa 0b i.l( nq9n upply. 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 cbh 0ze 5bz,5pcq+qx t6onnected to an AC power supply. In this circuit, the current+t phqexbb,c6 5q5 0zz

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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 wht suxybp;3i-; en the frequency is tripled?t-ps xu;y b3;i

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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 . tw)m 6f+u lszb wr8;zk*jx:xAC voltage across an inductor is doubled, the inductive reactance of that indurl.8x:b *fjuw +6;mskxzwzt )ctor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, the indu e wm)p/9id tlce83wh 2u/,z7rk3sgqoctive reactance/9l7dsrw 2i/ kcozh3 qu)tmwp 3g,8ee 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 powenmuc beljh2us9* 61b2 r supply. In this circuit, the currebj1 u lusn22 6*bhmc9ent

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor whes d/wm -1;cgbqn the frequency is tripled mwgsd-/c;1bq?

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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 capb:*hy e8.n caeacitor approaches zero, the capacitive reactabh8*eacne y:.nce 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 capa uul6 pp8on.*eaxb :j l76o.k y-e(aylcitor in a R. 8lylpy l.ab7p(k aueu* :jx-6eo6onLC series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined*(e )zjrh+9zvwf f 6dx 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 cibj,j v*oyn)cl z46cg,rcuit increases if R increases. When is t 6 vcnjy*gb4o ,,cl)zjhis 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 impedance of the circuit invs)k.odf(2iz creases 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 impedanbu4 3g06n-s0rcia s q1p2qi xece of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRhsciyn,w4gp xe7 f3(.C series circuit, the resonant freque7fc,pgi x.ynw (34ehsncy 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)2,ppa8st6 wcs 0qb0z 5ryws j 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 occurs w6 u6ld:-rydl/5vhf gk5c k9 ihhen

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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 mvqh e(w-p4pc 0o 6o9ax is rotating in a uniform magnetic field of 0.20 0eqow p4vc6p-h9xa(o T. 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 rotati2n 8x4mcnndn */qp ;6fr9m ogfng in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendic84gn; mn9*p nrmo/cx6f nqfd 2ular.

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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 ror:wx,eyv3 :u etating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fi3y,: e:vxurwe eld 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 reduc8mw+j o8zkhm) 3 zhg y)trz*9hed from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil chfeo k/+s*x7vi-ta,,h m 6pmtdanges 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/ osgg;8s*u8, ly3 wi4if pxjn a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coi/lgpj*sxuy ofw48g;is8 3ni, l. 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 withosci ; 7*e.*kj 3zkrrt 15 turns 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 ar* wmol8ar 3aa2.jh0bw ea $0.20 \; m^{2}$ 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 w/+lnzvtyibc ihe(-(8 ing span of 60 m flies horizontally at a location where the downward component of ihl+/n 8 -(viceyz(tbthe Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2 hcjnm 8l -ujb5n1/f8g.0 m long rotates at a constant angular velocity of 2.0 rad/s about an5fljg 8ch-bmj/n8 u1 vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional area7gskvh5d a0z p))uvd/) fnzf - 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 area o,+g:v.rukr5awgl c 5 $0.090 \; m^{2}$ 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 h+7 +no4p j gp.mcqi2r 1tec*rloops on its armature. Each loop is 12 cm long and 8 cm wgrt 7 ec*hqn2c ppmi1o+.+rj4ide. 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 of 100 turns of wire of a 7w:k. meav 4a9com xr+lb8:harea $0.090 \; m^{2}$ 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 u 94q k-t o nsy (xh)*yb6/oq5cnyfpy5construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T65pqf)o9 5b / (*yunoyycx -nksyq4th 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 witpg hmge1c4ks60 o q2i61 u)wp/qt/mrfh a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates obefur)mvm*) 5 n $120 \; V$ 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 fhf0 o-pytpzov)e;/ 9tbtj4q 2t u 6bv:v55xt of 6.00 W. The motor operates on 120 Vtbtf9p zxotu5: v)foj;2 bhpv5e/qt 6vty40- AC, and when 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 co0s9xuoa- 8rx-k3gag3 *fb0qdk hmev4 nnected to a 24-V power supply. The operating current is 1.0 A. What is the start-up cur 0hdu*-sa m xab8k43o3xgvqgk-e9 rf0rent?

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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 resistanc:sg8j*ee 8n48km rwl ne 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is tr n*48mw ken8sj l:eg8he 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 ib:o 73pjixp harqz f76u-4w+a v6ok.bs connected to a 24-V power supply. The obqu: rw.v3kp6z+47j7 oi boah6paxf- perating 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 transformer2i po*si3tf 8zkk g*( zpa1sc5f)sj 9b is needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow44lzw dibmuuv ;ia-kith998eb3ab:4 in the secondary. How many turns are in the secondary 3tuw- i4vz8ahlm9b ; kai4 b4b:deu9i?

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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 110-5d2 yjzrdb2 lvq-;p4;0mg/p ; dispbb V primary if the 24-V seconda40p-d2 r ;dqd/2 5zmbjvyblpps gi ;b;ry 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 erzzi 1r v;;5n.f9i a.vrw)ip2000-turn secondary coil. If the current in the secoezrr 5;in w9.ipv) z1f.a;virndary 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 itsf vq *klntp t4y27k-e o)s9(n the primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secofq2s*)ytk l9 n (estv k74ot-pndary?

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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 tranv auuq 4b0rur*lu:/+ d- px+bosformer provides 7500 V at 10.0 mA. The primary coil operqub: ubxapdv++r 0u 4 ru/*-olates 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 300 turns on ofj z1 zkn/1itvfe1/8 its secondary coil. If 120 V at 2.0 A is applied to the primary, what voljnef1/iz1 z1 vko8ft/tage 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 o cf y w 8;jrt3v1wew5(:tek9jqf01qrsn its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to0s 1wr8ykeqrqtw91j t:5(3 w vcfe;fj 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 transformer has 100 turns and its secondary has 200 turns. Ifji./ ,v d0 j)p-jiv/ulg;iyia the input current at the primary is 100 A,i u j.0/p/jyla,dv gjv- )iii; we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turn4ig4s im*j6kz k3o7aw s. If the input voltage to the primary is 100 V, we can expect the outpo 34*sawmjgk 6 7iz4ikut 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 a6dje6ui6 m+uz ku:sloa) (b3f nd its secondary has 200 turns. If the power input to the (fadus+ l m: 3buz)e6j6o ui6kprimary 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 krfhz2gbdo s(kb5.lb r*f9;, of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and tra5sr bhkgz f*2d;bbfo( 9 ,l.rknsmitted 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 current at 1205v o2xkv,fg ) (vepk,n V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total v)x2v pk5 o,evk(ngf,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. Theyqw.ny,c jk24(an g)+)p*ggiaw b ,f seksi(+ 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 pnswakgwn(+ y,qgikgy(,+ap*i) c e 2j4 f) .bsercentage 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 liou6j1m1 c8hmane 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss aj1c 8mhom61udue to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not 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. t(x3m3rfy5v6apk ov55 2o5wgjnu1it:gb h - cA generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of th i2 rtb56kmg3py-1tjn vuf o5coa 5wg(hx v35:e 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 +q -d5 7h athaka u)hmw-ntz*5V. How much less power would be lost if the power were transmitted at 3000 V instead of at 10uz+* kaw5-)7h5tqh-t n ahadm00 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted onhhney 4ql/ig+ gm;,t: a line with resistance of 0.60 W. To what voltage must the generator output bee qilhn,+y/m h4: t;gg 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 as warn2u/( t7f1kqp* much energy is stored in the coil's m1u kpr( a wan2st*/7qfagnetic 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 and an 18-H inductor. W6wqp/gi*g bz pt i5-w+hat is this cirw+ gwp6q*b5iitz/ p-gcuit's time 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 ta e71 )wxwogh;he rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak current?fwk h 1.h7sqr(

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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 resistah8q7+jr, ckba7e c w*once of the lamp?h coq7+e*a7brwk 8,c j

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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. Wha(7 bzubdga0)b)o-opl t is the peak current throu)b (0ul bz-oo) dba7gpgh 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 auy,+jbm wjxv5*l 6dygmg. ;b;c power supply. What is the power dissipated in the re*;jgv+ bxdm ;mljywyg, u.b 65sistor?

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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-pr k -y rn,n;yn(vs5:7f(eghr W 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-W resisoe52 gti 8mndq()y6pv t9/d+-m tn j*svke3dvtor 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 resistorxc2;nyrij8z4i) r, * 8rhqrrt 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 reactancea*+gr argz 1/2 lejzx)+mctd8 of a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactanceh fc c.)* c--abvbwu-k 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-mx:5fzy3su9bmi3tk g 1H 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 1000uxc. tcf/r8-sd2 wj(yu qw l(2 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequ; r:isf iqeeze6- ht /c)+s*niency of 20 kHz is applied to it;-ne r shf ei*tqic)/+ze: i6s?

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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 nkpag eudb0*j+ -qh3- 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 4.7-mF capacitor at 10 kHz?;44 bc43qepc pih uzg7

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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 250tn b di;cjoreactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF cap /mv i :mq;tr *jq+un*yn:(mulacitor 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 reactaki* i q(jsds;.nce of a 0.010-mF capacitor be 100 W?d*sik(;j. sqi

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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 cap d:o7rsa;ytr*)z( (u4 acfs wpacitor 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 zzcyk;k10 (wecup, sc) b*zf/-ug*d cW resistance, 15.0 W inductive reactance, ag1upk k* c;z0( ,c-/cbuwyfd)zzc*es nd 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 resi s6mtr1l 4wsg-stor, 20-mH coil, and 1.0-mF capacitor are connecte m w-41sl6rsgtd in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, andfj:kza1 .p d q*,nr 095ndlgav1- btgk 1.0-mF capacitor are coqv,0b.:nkj- la d9nafpt*g 1g5 zrk1dnnected 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:w5zfw)v fqu ;bd0nng7gqc;5 is the impedance at 1nqq;0ugn:v g )z5dbfww; 57cf000 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 co tbk13,blwrj +nnected in series with a 20-mH inductor, what is the phase angle at 1000 rb 3wl+ktbj,1Hz?

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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 serie /hyol k;:jq4xvq;3 czs circuit with a 20-mH coil and 1.0-mF capacitor for a total imped :l;jxq3cv qykz;h 4/oance 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 100-7 kb1)dmy c)(adqaj- j5cd,qc W resistor and 15-mH coil to get a total impedance of 110 W at jcqc 1 -)mq,5cb7ajd(dd)a y k2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for toofuuoz1 z9m,4rqt8z oe-8 9 a total impedance tu8z z19 4ezuo,r9 f ooqm-to8of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for a3 yhz5+j6eh xa total impedah y3za5xj e6h+nce 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 w hba ;e1p9f-/agz8c writh a 20-mF capacitor. What is the impedanc-gb9 zf repwa;ha8c/1e at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at m7;xo (uu4qgpk1oh48ul .dlo 1.0 kHz for a total impedance of 45 W?oqk1(lm4 uxg d l4p;uo.o8u7h

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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 capacif.:-/al vit7;d ipbr2;fjly jtor at 1.0 kHz for a phase angle o lv;: y.p-tljj/f 2;raf idbi7f $40^{\circ}$?

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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 5xd0/13a 4amgp nv 3axz10axruw0je z 1.0 kHz for a totalxx1 eanm0 0wgd13rj4z ax /3pv5zu aa0 impedance 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. Whag 6g2y l0im bycb3q(z0t is the phasgbyyc23z (l0iq m6bg0e angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.5 uef2rgm y(q )7r8zzr0-mF capacitorz fr 8r5z2 )e(myu7grq are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W v.d o3+77g6qs zptkqn resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Ht ozsp+g7qvdq7 k63.nz 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 cgg gkaewu jf 9bhd1 nz04(op)mm1;w;* apacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series gdumm jkwo gg10z p1;9efb4* nah;w( )to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resi3z9 xa3.pmuz 9)p77 gdbbmfak stor, a 10-mF capaci9ba.z)k3 7xuz9gp 3 mb7f padmtor, 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 resis (2t v82dnvpyj16 ibe.o*b apmtor for a phase angle of potba8v2 1 v(bie.mj2pd6n *y$40^{\circ}$ 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 ( hyxxg+. qk)wd vmv5iybf634 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving source)v5+d .6vh ykmq3gwi4(x xfy b?

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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 wabv) (jwqo3(e e:o-uzith 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is w(zqe(a ) bov-3 je:ouconnected 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 ixr06wjgt8. i bs $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W*wid)ry2 qn6 j. What is the power fa*qyj6w nr)d2i ctor?

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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 RLC8 z(v(md ha8tfw4 nq*q circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inaqwq fh *8(4t(dmnvz 8ductor, 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-ma srv+aee;8 .h4wk i8vF capacitor and a 15-mH coil in series?i +av8rsa. 8e4v;k hew

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7ch g;bqi)mgw97(5 sj o-mF capacitor for a resonant frequency of 10 kHo5hs7 qj) gmi9;gcw (bz?

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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 ind mj01u . bp51sjvcbi9guctor for a resonant frequsu1. jpbv5 0ci 91gbjmency of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in ser1ip ;vq s0od. +/ime6wrgccf0ies with a 30-W resistor and a 40-mH coil if the resonant frequency of .q+g;ro w6 / m01vicp0fecdisthe circuit is to be 1000 Hz?

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