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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 ared 34 2l7m4muvr2qjxil8ib ne, units of 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 inductio* gk5pob4k swoh f)d3;n states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil producep5y/3r 7bu(rvn dzc d:x2zo/ zs what kind of change on the indur/zzd xuy2c prb3z(v:7 n/5doced $emf$, 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 thron -jn30so4tfd8 wpnp*ugh a loop of wire produces what kind 0jp4 n - nsf*n38wpodtof 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 y7vg n1-8x/x( xb ncurloop of wire produces what kind of change on the induced bxux 7 8gny/ 1vrnc-x($emf$, 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 magnetbo q6 9 gclpkv5;tg4sg+z :ou6ic 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 gh-c5gq+. yyj of an induced current in a conductor will be that which tends to produce which of 5gh+ . -gqjcyythe 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 hrzdsk0l 274 pqc +(5 supv:hrfzrk6 2n kss)f;eld above its center with its north pole pointing down. The stationary magnet induces (when viewed kr;sz u r4knzs cfkps05(rd26:s2v+h )7fpq l 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 flaq+pyfx94 f khfhhv 453t on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the4hk3pfvh9 y +q4 xhf5f 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 vectojw8 z48ir7zv lr points straighz 7r4v jzlwi88t up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the masww7v ;zmz1(r-ckb;0dk0p z s3g:qh ggnetic field vector points st1 zr 0:h(qspgbz dz7sg;m3-kwv wc 0k;raight 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 magn, /qf8b 9dnsz4u6gz,oc8sj(a 3nwl kmetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the idjw8n 6z kcl9( s8sq3,b/, ngfmzuao4nduced 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 horiibgt:vdk+kiy+v t ( *zv.6 fx(zontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When view +zv+:t f((ydvg k.b x6tik*vied 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 u+mn2d kv:h;y entering first. As the north pole enters t+d ;uv knymh2:he wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed abokeelltr k;t+q(0o*n5.2 vntq-ekn . c ut an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, vlkr+ennqo k5t2t.. ;k*qt( -enec0l what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at con d 5fb;,ek;fztstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field;kf,f tezb; 5d points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law. j bng68kve2( magc89 xxaq 6wyo+,s(m
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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 t;h+c/p zjd+ 3jjhg:i khat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a mcoa 4ne; -r:q( tt+jhxagnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented y*4rrjw3 j3c bp(t;fifqkx-8 in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the pjb4qk(w-3ir *t3ry;8 fc pj fxotential 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 p1 mw tnu/u8n+constant 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 trf7spt/y 5v q*fansforms

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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 revolutbc0k6c ,x3 8/1nj:p6ugbu xbg l7cyi bions each second. The frequency of t07u ,l6j p6/xku cn1:gciybbx3cbb g8he $emf$ 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 t;t fc72/iedhwo

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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 devicehm)*gsj il*dne 03 b1k 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 sec3 2 eoh8nvi6hsondary coil contains more loops than the primary coil the ovh8 3e2shn6in it 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; lo7)t. ecfwhrp*o6f;awi6 i contains more loops than the secondary coil then ifofw ia opcth .;7;*66rl w)eit 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, thikk+j19(jtw ;mfww9 2yay pl/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 d//ydr) ,xhhoa3od-o l1ghmtwef5 ;5circuit,

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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 sernbq ec t.j n q/6u:3y.mhv:3dries to an ideal battery of constant terminal voltage. At the moment contact is made with the batnd/ mby : .crqe6hn33.utqv:j tery, 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 conl; *,j1+.eyqrnnpy zpnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the batp,.+nr;nl e *qz yp1yjtery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to an;46y im9+udhldpt9wf $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected (88jr -a vagkw .gky1s4l a3ksto 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 7t,19odw b)d pu4kcdk b,gk u3in series to a battery. The time constant for the circuit represents the time required1uk7b4kk9b c w)ddu,pg 3 t,od for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The bm85ws0 -uvtk.m e;3tyl oyn 6jattery is suddenly removed from the circuit. The time constant for of the circuit r w t3ms j0ky.vy6oem;-ln58tuepresents 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 ;-2akefd* an nsame units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC powc, x6 nfdh.r0rer supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply2u: 9,v q vkisjb*uxa,. In this circuit, the currenkvx2:9s* qj a, ,uvbuit

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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 m-dl1*0 nx*fjsso4ch by what factor when the frequency is triplec1 d4-*j f0 solmxhn*sd?

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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 af15xoozi0 s, dn inductor is doubled, the inductive reacta fs510zoid ,oxnce of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage ac)msr/yzbl,k2c)dr dax7zj 78 ross an inductor approaches zero, the inductive reacm8cza/7 )kr,rb2dxj)dz yl7 stance 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 tet 5ml/o8u+d ro an AC power supply. In this circuit, the currentdr/lo 8umt +e5

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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 w- ugrpfoc95hrwa-,e6p m f,f;hen the frequency is f 56wa;- ,mo -9hcfuprpre fg,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 thfp7 m)y/s cej8e AC voltage across a capacitor approaches zero, the capacitivc )fym8j/ps7 ee reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of( s0byjwpljn .p/+4sh the inductor and capacitor in a RLCpjw0(h /4y sp +nbsl.j 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 mc t :65huived pmj:ge8sv,95an RLC circuit 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. rx pco;(6 ltlqu6zn86 The impedance of the circuit increases if R increases. l(8zxur 6ql6cn po6t;When 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 impedance of the circuit incre a rq/kui5g.g6ases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of ydqu/6xnqzh;8jg uj o 5ji 89lah110tthe 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 rnu c,6t jjhb42 05iqean LRC series circuit, the resonant frequency of that circuit wil6ut5c0 h 4jnri,be 2qjl

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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 re57elz1ib 2v 7y (vbarbsonance,

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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 csrs;hd w/udrs oy0oq*j 154w7ircuit occurs 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 ox;qq ;va2ck6d (w nbb(f 0.20 T.x(6qdc anw;qb2b;( kv 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 i g2n eqrxcla)g,rw50.s 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 magnetic fiel52 nxg0r rg.q)awce, ld 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 rad *1kto:taxa-lbv4o p 4ius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic 4 14x bp-oaa:tkvo l*tflux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an tw8xcux.3ihsbz :/ 8p adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coaa73gax .;b3lvm-0p syaxa /lil 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 siy2;4yy,g enb : p9mcrldes 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field y2e 49pm:n y,lcr; gbychanges 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 turnlosyot9 fnn95kr;t gcz s7b7k03 h) y7s 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 anduv;ey 6+tkc r7 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 location5 ::es+m/o1xwh joag x where the downward component of the Earth's magnetic 5x+:whej:m1oxog s/ afield 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 wkag08e5n7d zrotates at a constant angular velocity da ewg8n05z k7of 2.0 rad/s about a 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 ar.6 qi9xtgf cq(ea 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 wirezt.x;k io1:zbly)sh: 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. Ear*k t6,f2 rkogch 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 outputgr r6*kfk o2,t 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 o5zc0*- oqw0gr ins o3xf 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 *nx7mnt976l djxyz)jycf/ lw8 t*7etwith an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is y6txyt*ej 9lj7 fd7/c78nwmlx)n* tz$100 \; cm^{2}$, 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 maximumi :rkm yf60,7 m.sledd $emf$ 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 6yt/hl2gcpjme4a:n 1resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistancel 1rvb+ jzzf4 d4-s5me of 6.00 W. The motor operates on 120 V AC, and when running at full speed it zfz45+rjd-mevs 41bl 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 6m;uwv8 v pjoz 26yre76.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the s;owy6 86r2 vpj7umzvetart-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 sj9rn ry; i72kwupply. The operating current iskry rn 2;9w7ij 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 h-6g u ppzs9q/qh/ jrv*;ry z.resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is th. /h9rjvzq6;h-ps ugpr/yqz *e 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 90m, l b(lble)i zqjzu8,ubk4voltage 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 flow in thibw gidn7-/t 1e secondary. How many turns are in the d ni/i-t1wb7gsecondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V hc(v6,;maigj primary if the 24-V secondamcjg h i;(,av6ry 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 p8l v7w65v 9 f*vukhorlrimary coil and a 2000-turn secondary coil. If the current in the secondary u8k vvl6hv lf* 7w5ro9is 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 t+r1w*f dyz y89)k l p4ktait1she primary of a transformer. Assuming 100% efficiency, how many amps at *4r1fty a k)p8k+ tswyiz9ld124 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer prry5u:fu: ; jkfovides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does tr5:fk;u jfy u:he 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 32qhp*jd(y6b t 00 turns on its seconyq(j ph6d* tb2dary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 tu uaf1e pp);q7jrns on its secondary coipjup);ae f71 ql. 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 100 turns and its secondary ha uk(ch- fzsg3/zu58p rs 200 turns. If the input current at the primary is 100 A, we can expect the output current at the seco-r58 gfsz( 3zh/ukcu pndary 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 ands*m e w7/ylo/k its secondary has 200 turns. If the input voltage to the prima/7k wmyes*/l ory 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 turns. 23x lw8s;umtc1vh3+qn m hi8s If the power input to the primary is 100 W, we can expect th;ns mu ts2l8vm 8c331qhxw+ihe 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 stepxk0o5bez.e 23qi 7ygsped up to 4500 V by a transformer and tr5 k ziq x.y2og730sbeeansmitted 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 120 V. The voltage is usually stepu8 -yud0wxt 14kfzj4 dped up to 4500 V by a transformer and tr8 j w4zd d4-tyukux1f0ansmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of curr9cw):l1w rblxent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance xc bw l:wr)91l1.0 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 lin9da hbda,/ll;n)/ jm2e0:d w ctj gm1ve 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. Iemg:j /d/9m;vwa 2,b ) 1al0 cdhdjtlnn 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 long has dz .0sp6sf 4j) grow:ik4y5 c )7v)xqlsqcpn ,a total resistance of 0.60 W. A generator produces 100 k4r vw sdq oc)s 7:qjnl5f)4ypizc6,.ps0)g xV 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 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 -,))fugn vurxb) y*zfat 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 1000 V?vg *u)yxub,r f)nf-z)

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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 transmittedlmahw x/3 k/6j9,zgu2b6 p3rja2 noe pt1zua+ 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 transo+ej2/3a 36 rnut6 k1ubmp z2x/jw l9 azg,hapmission 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 j e8py6 enru2oeld.ewx ,5a03A. How much energy is stored in the coil's magnetin6,ele.j pe23x5w dea80uoryc 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 resisto;gyb*/(vh ib td3,lumfay.rby4 dc(;r and an 18-H inductor. What is this circuit's ta3hdf,y(t b(;y ycr. ul v/*4bgm;ibdime 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 in5k ;4sj/hks i febww,2 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 peak x-e7u 0zq6: v v)l,pmqg0uohgcurrent?

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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 u8n7w2l ;ufrjrfxz*n7 .ns(d;lbzh 6AC outlet. What is the resistance of the lampbn;l7hu;nw njl 7.6u8zx*zsdf r(rf2?

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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 jl)z9.i/ zl4)l y oa vb0b*b/y4amegw. 5mv ovpower supply. What is the peak current throm )lz a.. e4b/ ly5lo)04vbvjz*aiowym9/gbvugh the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supplyu9u 3; ozni-n9mud-yuok,;t2*rs hce. What is the power dissipated in the r mnu;,9 uceoz9-hi-*ntsu23dr; yko u esistor?

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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 is9l h0d)q iz j 4+vam.+qcc.yik $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is ( ah*,h(y 58pkzzirol 3 z0va+bz yjyw *)p(ex$I = 0.80 \sin (240 t)$. 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 g gk0mb a;p s6-cm/t5ca 50-W resistor 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 aqywlcr jc:.1.5 5wd.a nytc,*uf2 xoa 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 reactance of a 2.50-mH c9hx:i (:jfbj4e ct5a:eyt3troil 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 14azl e2o)q; my; gorfy2byiq+fp*00 6x3mop0g .0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reacta3x . 9 ejop-a)s8,nbxywmjr8knce 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 indu.xyxdw8k-eo (v:4 asvma.nb /ctor when 120 V AC at a frequency of 20 kHz is apx4y.onwsaavx-k/e d. v8 :(mbplied 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 thjb5dj4 uj :jr.ass++krough a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7:z b4q.2 naiyw-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to g nw gm3:ose2;cu;vpp5ee:: w g6b7yqhave 50 W of capacitive 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 10-mF capacitolizyna -;7l 10n hdr6ms4j(ror 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 reac8)ktu2jvf/x *i b)sn mtance of a 0.010-mF capacitor be 100 W?kxuv *fi bs2 m/t))8nj

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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 capacitor1x x)qvn47q qhdm- k6p 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 W resistance, 15.0ro li,wu(q, :r W inductive reactance, and 10.0 W capacitive reauwqorr,i:l , (ctance?

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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 impe dyu5v6l9/)8u8qzqo *vskv zhdance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF c uo9 v86q/)s*yhzkuqlz 8d v5vapacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil,+t oo8 )zk0 z)0ntdx9r q1cpbz and 1.0-mF capacito+1 8kx)bd09r)t0znq ooz tzpcr are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is the hdbf-un,p4 gri ;-: asimpna4, rid;p-gbh: -sf uedance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductih2mv/-4 n o)-idbwfn03 b x,xc.lazxor, what is the phase angle at 1000 Hafhv .ndx)mwx-3x0-bl/ io b,c4 z2inz?

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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 ak(c.r6a qq+6 ao5 mcbr 20-mH coil and 1.0-mF capacitor for a total impedance of 1rcca+q o( r66abmq 5k.00 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 a2)lw bk +jy6kg 100-W resistor and 15-mH coil to get a total impedance of 110 W at 200 kk2jw6by+l) g0 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 serigthz*c5/08fus - xilues with a 450-mH inductor at 5000 Hz for a total impe l8xugiz0 u fth-/s5*cdance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW f(xoiy5-zmf 0y1 g 1pwresistor at 1.0-MHz for a total impedance py (wyfim-10 1xogfz 5of 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 ser 3 yv)mj xmnmvy41l.91-dxbl dies with a 20-mF capacitor. What is the impedance at 1000 Hz l)ln djmm1 4bvxmy3ydv9.x-1 ?

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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 1.0 kHz o-dwch 93jvd/k qtb4 0for a total impedance tvdb/4w ohk-c 9 j3d0qof 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 withv9o ;v5 duqoa/g0cji:v,1wt z a 10-mF capacitor at 1.0 kHz for a phase atgc/9avooujv5,1z:v i;wdq 0 ngle 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 kd;tzz2x f0r9b9t+: np obr5twith a 30-W resistor at 1.0 kHz for a totalro5rb9 f9tztnxktpz +0:d2b ; 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. 05 dn;1sa1xlpyix8 pj tu+d o6,hps7z What is the phase angx 7s 0sx;ltp1o5ipj p+1zdnuh6dy,a8le?

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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 waoe. 6a6t tc2o:w zc75.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mFc aetzwt oa6:2c.6o7w 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 a 100-W resistor, a 10ur1fvbi2 f6)z e yr 3,e1re-qo.0-mF capacitor, and a 0.350-H inductor. The ci2q f1ue)orz6 brevi-yf1 3, errcuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance pm1xze1f)g .ds :o wg(30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. Wh.eg( wp1xsd)f1mg zo :at 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 resisu81m q ,u1eyystor, a 10-mF capacitor, and a 0.45-H inductor, when connecsu11u e q8ymy,ted 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 resiscao l+;zt)p22lay4 z ftor for a phase angle ofz22l+fa ;ly ctop za)4 $40^{\circ}$ 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- ayx7l kwc,b8k+ta /j+z /all s*:zxs3mH, C = 10.0 mF. At what frequency should 3:8yza*z,jbl+xcals/7kkas / t+wlx the circuit 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 12.0 W resistance, 15.0 W an,a7 gdw59w+t k7ruzinductive reactance, and 10.0 W capacitiv,+u7r wt9w knaad7z g5e reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit imxef9vge0 9i- s $63^{\circ}$. 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 impezuq;*j()*,sqlbu x rxdance of 60 W and a resistance of 30 W. What is u)(lus ;rbz jqxxq**,the power 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 s/5qgrq0 hep8i(rthc 0 eries RLC circuit containing a 50-W resistor, a 10-mF capacitor(0q/cr8qth i0gh5r e p, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mswfsrls6q q/l wt-s/)zf-s : /H coil in series?/t lw fsfq :sw-)- s6lsrq//sz

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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 4.7-mF capacitor for a resonant freihd0;t/mibn/ *n(d v)hj ):ij7q b)i rdu ljg(quency of 10 kHzh /():b v* ijili(iqbj0)trhg/ud 7m)jddnn; ?

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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 irs zjnjxul ..8s -/l;f,yhuw1 nductor for a resonant frequency ofu.yxj zll/8,;uf. n 1hrjs ws- 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 4 z3+vfo2qo8 jb0-mH co+ b 8o3ofvz2qjil if the resonant frequency of the circuit is to be 1000 Hz?

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