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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 f39.k5eojjo kw,kfpli2yu+ +slux 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 statew8 mdqc *kx3 s6o4lgt6s 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 losi8/0abj5dd psp;8j ;vnu rp 6ops of wire in a coil produces what kind of change on t/v5 b6 ;sij;s8p8dppdn0jur a he 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 fien45ocfnd7 0o .ahii9uv) 2ejald through a loop of wire produces what kind c2ii50ho 7fvd ja .n49a)ueo nof change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire )+w i, uaaop+vwj6.jcproduces what kind of change on the induc+, i+cp ).av u6wojajwed $emf$, 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 froj/rj-+mn jzqo*i(, d m7c wrf.m a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced cus6 nzde:.5xc sludd/)t c(kj- rrent in a conductor will be that which tends to produce which of the following effects?)k5x-c . s/d:(nejsducl6d tz

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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 magnq 87maco-v 2qk:d(ixnet is held above its center with its north pole pointing down. The sta( c n78 k-xm:iqaov2dqtionary 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. A bar magnet is held abobtpr 7jy82;odu zi+:aqum 8 d+ve its center with its north pole pointing down, and released. As it approaches the coil, thebtrdd:88 +ip2z+u7 u;a qy ojm 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 w n19uf+a:s wa krkk8a-here the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in t 89n1 kskafwuk+ ar:a-his 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 regi8qjo* wz .ebd,on where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the diree.wb8, dzj* oqction 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 ho*-bq7f - lrl,rm*,pm6keria erizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappeak r*a-q7ml,briper*le - ,fm6 rs?

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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 carrv-czg9,(h5i7zux)x a wy7 u3qnkj5 rcies an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from aboj(vqrg kxc7y75un)5zh-3 iwxz9 a, c uve, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering first:u pewl0ln3oow,pn, 119g bhq. As the north pole enters the wire, the induced current will be (as v0n, 3oewp ,l1h l1ubwp 9gn:oqiewed 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 angula 74 j2up0v1ufbxakg 0sr 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 rotafxa4usv k107bpu 0jg2tion if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed abom xcfkn mpoc- bzq0(th2//)-yut an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what mustnmc0mt2 )y-ofch kb/q - zp(x/ 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. f:ur-wq 7/zx+ ol*jjr
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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 abxx(*bo 7n5u en $emf$ 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 fi.lt sq6 56ufzaeld. 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 m ccii9 9s;:+b+wm w1esf*sg1n zfof( doved northward at constant velocind+w os m gf9 f(c+if 9z:wic*e;s1b1sty through a magnetic 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 constanl2f;5ai.z.u2gjtppgga1vq ; t angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transformj . 0i(j+h 1/qomjbhmcs

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frequency ofqgpg07zq91he j gm;tcl-gw ) 2 th;gh0mlgq getzg- cj97 qp w2)1e $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used th3,jdxw ( -cxar 8sy9go

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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 dev(g17ki7r +lo.e ji jas- dk2ttice 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 loop0x qhl)9: g2 n9gk nu,j;ifwfgs than the primary coil then itxgj k liq9nug2nhf:gfw ) ;9,0 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 contains more loops than the secondarlbt:pn-* rardh8.ank* 6 bc, +l/snkvy coila tn*p :/n6r,a* .dk l vrc8h-b+bsnkl then 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 5brq. gfa0s e+power input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant cir r /zk4sjc9 zu)i,6vpbcuit,

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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 connectez)zla5z36 vk+a je h0ocxm 75kd in series to an ideal battery of constant termina6jhlkk5zz3 aczx)5v + oma0 7el voltage. At 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 connectm2iehdy-2d+ x+rhz - med in series to an ideal battery of constant terminal voltage. Atmy hr-2d-z+ m+ie 2hxd the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connecteds1wlti fncp 9 51da7 v9b06mjy 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 witx+gb9x ibraz;o 3 i; rb8fr.x*h inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series tou1x;t qn3vg cza;/n7w a battery. The time constant for the circuit represents the timexguc3/7avnn;1z;tq w 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 c j-s1 uy;m:fjeonnected in series to a battery. The battery is suddenly removed from the circui-j1uy; f je:mst. 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 +li hk9/ g;lvsw 7)fs.u3mv hxunits 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 thmi m24.n38vbm7:,c8rfi tu d yt(cvndis 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 con mgldry3gm4gs+2 3xo:nected to an AC power supply. In this circuit, the curreng+o 3 24r3g:dmy mxlgst

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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 c-nhrzb z7jf w 68b cd8 dw13ptx)s:kj5hanges by what factor when the frequency iskhp8:w3b5d r)jdjxz8sw1 ct 6 bn-f 7z 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 vowi c2 fj-r2t8wltage across an inductor is doubled, the inductive reactance of that inr28wt wif2jc- ductor

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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 induvqz xyx;pp .bgs.idfs6fy1z) 1 n n336ctive reactance 1 nys fnz6;f)i3b3gpzx1q.x.6spy vdof 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 ln8 **:- n o tnmmr-z0mpspw(fpower supply. In this circuit, the currem pnm *(swln0 *:fr8ontm-z-pnt

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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 acw,th4w+ uq.(k6euz/dps)v vr circuit changes by what factor when the frequency is tripled+4epk vu(d. 6 r/z)hus tq,vww?

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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 ru5ag h( 6k6po3g; 0gvacku o6a capacitor approaches zero, the capacitive o k63aopag0r;guu v5k 6gc( h6reactance 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 v;h umzo pch**2oltages of the inductor and capacitor in a mhz2h;c* *upoRLC 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 circuglg * zm-2ajnvb1d+ 5rv: lt9syo4u8eit is defined 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 oyk 2ww./imv, ztk1v +circuit increases if R increases. When is th 2ywt ok+mwz, vi.v/1kis 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. 69,wmiejo ;emn eqk*5 The impedance 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 ib+j gc4:gb r,*up; cjgr f:2vtmpedance 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 j- k6no8fg:cv double in an LRC series circuit, the resonv86o j-g f:nckant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit t(z93f d1vwvi / qcpvx8hat is driven 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 r2 e jwz4u a3+(kxf(zjoccurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.r,d/(q ;5 w*z5mbhox smzp (wl20 T. Find the magnetic flux through the loop wh omp5w;( r5m*zz( /lbd,hwqxsen 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 un uwj qec4470rhiform magnetic field of 0.20 T. Find theuer4h7 cq0 4jw magnetic flux through the loop when the plane of 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 magnetif8 zu-c47i xvvc field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the mag7u 8c -ix4fvvznetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is re 8-iiey) mrk(uo l8zxf(,npe,duced 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 chan( vhuit.1 +pqm3.tnvt ges 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 5zei* eg5rf );cun7 ccsquare frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the ccgc)7f5; eeizr5u*nplane 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 with2 msz hl ifthk8.6bngs9d22 :dmre8(h 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 a9u:.lcd yy i3znd 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 horizontally at a loca)z ci;kit21 shtion where the downward component of the Earth's magnetic ;k2)h c1itszifield 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 fzh2sc1n +p n )e,d+nna constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constann,2 + sn zcd+enn)p1hft 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 area o)h+ xav5csk9n 9 bm,pif $0.25 \; m^{2}$. 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 oufz e4p0q8sepglh7 7k. yl+.nf 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectan (f 5* 6hgct/z3yv3m9zwchcd07opb py gular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of fg9zz c7y5y0 6p/mc(hv*w c3d 3photbthis 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 hdv j848,z/hw:klq ak100 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 generator with an output of, c) iiil1ne-3gvrz*s 12 V maximum when rotated at 60 Hz.cig, 3 rez1iilvns )-* A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maximum)l yz v .:5o z:fwen5;c-avm9fva8sb4zwt5ar $emf$ 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 operat 2hw,.wrvc (zrgqh;p1es 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 6.00 W.;d6 sz, a7dwpknvc(n: The motor operates on 120 V AC, and when running at full speed it p s7,(6 :wddnck;anzvgenerates 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.g2q)g+kznbsivpbx-7. 1** we2u cyfs-ieh d connected to a 24-V power supply. The operating current is gbs.nie2 xv.fic1u *7)*zeyhb-- d +wgpqks21.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connectexk67q3j(s yjm*4dhfm1b nab -d to a 24-V power supply. The operating current is 1.0 A at full speed. What is ths xq- f1ymd763*jkanb( m b4hje back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected .sd 4qbzc pi c/ajls7my92:e6to a 24-V power supply. The operating 2mzi e7cqs4s y6:c.p9bld/ jacurrent 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 to reduce a primary vol1q du6r 6d(pgmtage 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-turn9m v9yloumjns9*8 n(4 axopz 3 primary of a transformer causes 14 A to flow in the secondary. How many turns are in the se znm 8xy3lou 9*p m4(v9naoj9scondary?

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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 areb ;6-feb7bq5+kyafp0 7joa;,xlrgbi necessary in a 110-V primary if the 24-V secondf7,6i;;qbk 5bjlyg-+a fxpr e0bab o7ary 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 seconwaz r5.m .hth-dary coil. If the current in the secondary is 3.0 A, 5hwhz-tm.a.rwhat 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 transf4ecyi :3(oxaq ormer. Assuming 100% efficiency, how many amps at 24 V can flow in the :cqea4yx(o3 isecondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. T:n f3xgr4nvk 9bz);bo/g-zmz0ubj 2 uhe primary coil operates on 13zgn r;g zf-vbb z0nxm9kuo2: u4 /jb)20 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 30a)v g9aqib1t 9ef1pqgd4 4n :b0 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltagatgq pdb4)1aieng91v4b9q f: e 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 pd bk8juk*4r5 krimary coil and 300 turns on its secondarru*jkb4d8kk 5 y coil. 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 transformer has 955duuzx m0s.izl:tk100 turns and its secondary has 200 turns. If the input c 5 ts05xzd m.u9i:uzlkurrent at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 tu7fhsk.po;gbgr,sy-h5 o0jk /1j gas7 rns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltag5 f;h1spg/gh-o by7kos kj.rg0,j as 7e 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 :mb0(r-g w.a ag6ljm kr1m3euand its secondary has 200 turns. If the power inmkbwl0g(m: 6a3rm u gje1-ra.put to the primary 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 at 120 V. The voltage is usually stept rmbn+q3 0vbjg 5p7w(ped up twbg( b3 5v70rtqmp+n jo 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 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 12 n7dmotg 0tu-z+l.oj2 uc .dad.rdn+30 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line - 0u+td7.r.uc+o ddnmt 2jl.agd zon3of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepped7d2ufv, i urz/: gz9b3t szg*r up to 4500 V by a transformer and transmitted through a power line of total res b 9 z7*ugvtzdi:3ru2gr /fz,sistance 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 total resistance of 0.60 W. A 0 ix:4)c0wyxgd y:vq ggenerator pr)g :: cgq0 4xwidxv0yyoduces 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 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 loqoflt c ;9cij ),;xbz)0 ccxb5ng has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transfor 5)x;ojcfbtxq9ilzcb,c0 ) ;c mer 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 ms5 frh 8pw:h(lxzy/g 7e4p7 buuch less power would be l(yhurf4g:b5h l7 ep z/7sw 8pxost if the power were transmitted 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 to be transmitted on a linefx/gl2)mu kil+nhzf +z(t 47 z with resistance of 0.60 W. To what voltage must the generator output +)2u 4(/+zkif mx zll7gt hfnzbe 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 is stored in thc5jan 0 pyu8cxx(go73 e coil's magnetixocgnjx(c yp 53a870uc 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 resistordhtd m+ iz8.3(tivm4 d and an 18-H inductor. What is this cii(v di3 h.t8d+z4dmmtrcuit'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 volta*; g btua;xmip; a.pcak ;htq))4-jtxge 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 tp -7.zqjdytlb7 .xf;o he 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 llesnn 0l.y*(bx x,6 uinto a 120-V AC outlet. What is the resistance of the lamxxllbye . 0l* us,6n(np?

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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 qpb4pa-- ligt)x )ysb 98wgvfgb:;v6 120-V ac power supply. What is the peak current through the resistlg4i:p) w689b-g;s -fvv)b aygb xtq por?

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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 supp df,l(n5 hxe(hl8 vkh 6fnmg:*ly. What is the power dissipated in the resist,n l f hhl6m*(vdng: 8he(5fkxor?

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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 50-4mm63,sov ev 0rhbpfs:ybo 9 5W 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**nleo.zm1wb 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistsuwr5 h295 c hj+uhbt7or is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1o-cgr7 7jk0 0 voy/4w yd;ut3ub;ly0asermj1.0-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( l+ (ub3 d0q)okis0wy-mxinh reactance 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 have 14.0 W of inductive rbcs( i5ai(7t (k7xjhlrd b;9 weactance?

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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 reactap x* 1, 8efn6phvgjk2ynce 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 ibp lhqt) h.: q;siwk:9nductor when 120 V AC at a frequency of 20 kHz is applied t 9l:hhqi b;)k:. twsqpo 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 tor2e t i7qane38 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 ja i3p dp.am +if1il1l; :9hvycapacitor 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.jrpy //dbtz c/v/ts9 reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a/6 cjbego k+gryb 43y0 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 reactance of a 0.010-mF ca2hui b /2.dawh:r,o25akw+lltfo * w xpacitor be 100 Wawrb .5h i,ohafxwo lwd2l2: u 2*/+tk?

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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 Hz and 5.ca2-dli6p *fb0 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 resistancejo g3hlhwa 0576jnuyam), awb66tt u., 15.0 W inductive reac o jlta.)3uh6g,uh0nawm ajy5w66bt7tance, 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 1004uw(+zjh:wu,e w0 uso-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series,uw(e+ojwu ws: 0z4u h?

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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-mx l0 ,p8:s6qf ec 6uhycdhv2e;H coil, and 1.0-mF capacitor ac:8vc hpu,f2he y;d6 lx06qe sre 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 induc so dw,4f5c tcei5yk /5sish))tor, what is the impedance )wtc55/sc4)oifk,dyeih5ss 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 wit-ipm/er .2h5( dhsndwg)nr o 5h a 20-mH inductor, what is the phase angle ati w )-rme hp.or2 5n5g/nh(dds 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-mH coil yi ;d0s2 /pd-fgj 1rjkand 1.0-mF capacitor for a totadiky1;j/p j fs-gd20r l 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 serid+qj 7 5c:ep -yfmeattjik-/: es with a 100-W resistor and 15-mH / tjtckeaj ip7+de5y:-mqf -: coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance musthw:8-b4ir l 7xnopi;j be put in series with a 450-mH inductor at 5000 Hz for a total impedance of 4:n8ox w bjl-;r p7i4hi0000 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 -a uzg coj265x (sfd o)u5p+i*x y3k;.hhbhedfor a total impedance of 15hdyog; 2*.uixz53 p5 x6)eh bkdcf +sahu(-jo 0 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 capacitorh1k g(nj4.csm . What is the impedamsch .n4(g 1jknce 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 c/vzb e bct,9(fcl /j;in series with a 10-mF capacitor at 1.0 kHz for a total e fcb(,/b l/ctz9 c;jvimpedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz f6 h+o8y+d9reigkaq*z8 vk3 fbor a phase angl+rk*fz vqy k96g83hoibdea 8 +e of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for a totaudor(s:+1 a/jtyczdwem- 4 . jl impedasyt d dj:zju( m-oe.4r+ c1aw/nce 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 caavub5zm(grd q vim)t+ei m60f q2m;/2pacitor at 120 Hz. What is the phase m2tq(irv umv6q bzia2; mfe+md0)g/5angle?

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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 1500bewi ;fee36/a jk cie 1d+u.y: Hz if a 100-W resistor, 20-mH coil, and 1.0-me +ey. ebu:w6 1kdifi;ce/j 3aF capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of ilyk/q;ge5 8p a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rmspygk/lq ;85i e 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 30ntw gzm6 pt 8uyk9r.nah nq6yy 51+.j2 W, and an inductor of inductive reactance 30 W arezm6g 2 tw5.nqhp6 k8nyruny.j9+ty1 a 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 for a series RLC /b xrlfac+d,hja /mcl:9c*z-b vc ab.o9u,5s circuit containing a 50-W resistor, a 10-mF capacit-dc*+xfcllajbbu :c sc.v,/ob9 / rhaz,9 5amor, 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 withs+)1ms-e-q6zoz 9pk m5yhs zf a 500-W resistor for a phase angle o5 -6) ymmhskzp s-+z1se9oqzff $40^{\circ}$ 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 = 10.0g9g /g,hdsvm1 mF. At what frequency should the circug/9sgd1,gmv hit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12rd 5layr84 i1dbm se,0.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reaceddi,rs lm 415 8rayb0tance, 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 p5ocw/,8*w + d4zbdn ,0z1sf,blzler lcuh8e AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W 1lawom:cv gv (hkjp 6mux3-5+and a resistance of 30 W. What is the power facmukom 6j gw:1x+3a5 l vc(-hpvtor?

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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 cubv. n.+pqsf;t * e:hqircuit containing a 50-W resistor, a 10-s*htp. q+nq .;bfe:u vmF 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 gh2h y4+;a5fid qzfl +and a 15-mH coil in series?4a q+ihd h ;l2f+yzg5f

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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 seriesq -0y .n 5bdwoc12axd;/0 -xdkexiiiy with a 4.7-mF capacitor for a resonant frequency of 10 kHz?c 0x yxa w ;-ie.5iqyikdxnd b1-2od0/

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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 res3x.e*nk 0ye5* e/oqo+lpvijp*q45m m r)npga onant frequency ovanre+g* /npyq5*m0ip*o )5xq3.l ekp 4e omjf 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 s:;i344 bnekhzxs38 gflt al-coil if the h tgx ba83flz:i3l4-;sse 4knresonant frequency of the circuit is to be 1000 Hz?

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