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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://autoconfig.51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 80，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://autoconfig.51fly.win/test80.html  教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。
 作者: physics    总分: 142分  得分: _____________

答题人: 游客未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flvpphz-t:mv0 /o il7 nb2 kq;0xux 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 t ;eqjj df+g6*dinbc+ *hat the $emf$ induced in a loop of wire is proportional to

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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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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number j sz*; rrn795doacej 9of loops of wire in a coil produces what kind of change on the indu sd*c7e9j5ar r ;z9onjced $emf$, 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 pro0;do t.*yrki, 7avnswduces what kind of change on the inducewi0ytr vk s ;n*a.7do,d $emf$, 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 oqmvzpx b b7:,0f a loop of wire produces what kind of change on the induced b vm 7q0bp:x,z$emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic fielo jqne: cgx,.9(9nt jld 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,j7ir wx -xyb6d )ee09b+okm5 k the direction of an induced current in a conductor will be that which tends to produce whic i9bm wx5e6yekkdo+0j)bx 7-rh of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held ab0 ru7bc+hrj .a mif.z9:y3 gijove its center with its north pole pointi.g zm9 7iji+ rc0.3rbaju :hyfng down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal tabmz )fu hsm;ls 9,e08fjle. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewe jl),9f 0uhme;fmzs8sd 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 fiewbvpm(wo* z+ 3ld vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the ind3oz w+(v bw*mpuced current in this coil as the field fades?

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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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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 magnetic fiela k4faep6ypey c9l,8x2r08vf d vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as 4 c2x08alfy8v9r aype6 fk ep,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 wherlc*d9dqa ,x 6ye the magnetic field points straight down. The magnetic field disxa ydq* ,l9cd6appears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-inc) yei qpbb-a3nmt*8+lreasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. ln -+p)tq3 y*b8 ibaem 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 jrb 76gfpv d)z)fxvlb:(uz;. of wire with the north pole entering first. As the north pole 7).:xvz(zu rbj)fldb p6g; vf enters the 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 about a9csxcbses .3*g ;1k fon axis whose direction can be varied. In a region where a uniform magnetic field points straight3ss 19g; efoc .bc*skx down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated cxi2*hue*f5kr+- s ab( psqx7t g8o3 tat constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axiaftq(*ss*u3 +chxr 2 etkipbo7x- 85gs 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.7xiuj 6j )p1vx
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that a ivsy.(pj o:1jn $emf$ 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 magnhlr 79kif:ij0dq;6n petic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the e;t3 itakzc d9). f,jog(xg/maast-west direction) is moved northward at constaoagt; gkaj(3/i)9mc, t .fdzxnt velocity 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 constar kz6t+5myf 6mnt 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 7 2 t3u*hwq/2 +9wfxt1ih2wxskclnadzj6*xrtransforms

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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/ diy k.cajy 74q*my-y through 60 revolutions each second. The frequency of theiyk4 /-y 7c dm*ajqy.y $emf$ 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 dxei/ /a9p5fgf8rliudr ; ;jo-evice used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device *a uc4zdxq/,k(9 wy,m(mtyuu 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 containnbe/,: sg fx:ns more loops than the primary coil then it is abgex:n f/:ns ,

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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 gnxzt( .h j,awl.12ox contains more loops than the secondary coil then lzoh(x2w.,jtna .1 xg 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 powesmpl0jl7 no3o e92b5g r 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 circuq 7h 1uacic)t0kht29 vit,

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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 ankmvhe/ q 40kadc.:2ez ideal battery of constant terminal voltage. At the moment contact ihm.ekzvkd2qe4c a:/ 0s 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 connectepe6oo( l 20wwwd in series to an ideal battery of constant terminal voltage. At the moment contact is made w20olww(o wep6 ith 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 inducta6cipmdr3vj-x4-2;x7de pz nj; . mjs ance 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 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 djbtp:ah64*cw jr) (a)fk2 noR 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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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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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 s*if+ 2 af4fvzberies to a battery. The time constant for the circuit represents the2 4 i+vbf*affz time 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 intcut3w bw3s9 f8tp:c84g. gqp ductor are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represqgpusw8:c. 9 tb33 4tfpc 8gtwents the time required for the current to decrease to

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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
教师可以抽题组卷或一键复制本试卷，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
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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 xxdc.n(67i 4zm dddq (have the same 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 power supply. Oc so,smk ivn/38wh1o8z ht4 x:n 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 sl,vh,c7f+mu(yx avugur6 p q65b)q +yupply. In this circuit, the curren6b,u)(uq hv76pgx u5l, yryv+a+mc qft

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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 9enk ;lid; (u deo;v-yx:dbv:what factor when the frequency is triple -(:xdvyiknbo dv;l; de;u9:ed?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor ijfik -;g7(i fns doubled, the inductive reactance of that i jf-inif (g7k;nductor

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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 inducto9n4fleq rd* -u,u7pufr approaches zero, the inductive reactance of that coi4u7*, rup-qf du 9nfell

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power suppsg o jxr (hx+rfl;0 okr:07.usly. In this circuit, the curren 0.k o;sso+flxxu 07( hrgr:rjt

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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 factawj3s43 o 4yxbor when the frequency is tri o4abyw3s4xj3 pled?

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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,sr,yd9rx0 h 0r )ynki capacitor approaches zero, the capacitive reactance of than90,yhsr,) xiy d0 rrkt 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 a5v3hns*yvx y gu- )3jpzw 3kq)nd capacitor in a RLC series ci)z*)3 snkpjvy-y3 h w35xvg uqrcuit?

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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 as4-j c b/u(ogvg ld4xk5r) cq3u $\cos M = R/Z$, 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 circuiteltl*)*; jul y g5l3ho increases if R increases. When is this statement tre*) gu35hl*;olyl tl jue?

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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 impedi w(/zup 7lf-pa4uy;eance 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 impedance of the ciwt1 px3iem v5 d3sp+z3rcuit 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 inutia.0ewbm6g,qi- nr; (dr ap1d x*i8 an LRC series circuit, the resonant frequency urdi gt(*ni ir6d0-wqp.a e1;8xma b,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 byqt h6w 6lble7.1i9or c 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 circotn8yo-p6jgv92p g (iuit 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 roefmgxy :r*/ i4tating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop whe:iy/rg*fe x4m n the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fif7n/rebe;oq, -(t s fj jmo)/ield of 0.20 T. Fin (tr)m /-nbfo/je ,fsj 7q;eoid the 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 radi4c g;9cy* wdpqyl)b9 jus 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find y9lpcdj y) qg9;b c*4wthe magnetic flux 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 adjustable single loop 1 env4f9h sy3lis 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 coil chan2*0nrzqd8u ybig-ahr )n+ 7gvh +z4d dges 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 framek b( cj yozkodo+dy2ua7b41(i6l :4tj with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane ok okaj1 bui6 zdyojd4 :(tc7lob4(y 2+f 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 wit5 +/0i jhbf1)oqzkb foh 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 ai r+ ko9 izhkeq16hdn hml(aw *67w,y9rea $0.20 \; m^{2}$ 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 fl,/ 0i c.fs xr7c*rgkmcies horizontally at a location where the downward comporrm/7 ,xks.i cc0g*f cnent of the 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 2.0 m long rotates at a constant asfi ha q)u4z(-ngular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fielqif)s(ha4- zu d 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 anckgi4erzd zk6h.) 7za-7kr2f; 3-fv.rmvod l d a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of a*4ycy ob+ shn+rea $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangulaba-l(y/ q0zaeqxe,+ d r loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about az(/+-dea0aq bq ,eylx n 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 consieo;ag9v 1 c 9sxijl(h9sts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator w/.x go5x(nhc4s q5 )gfxw (rgwith 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 rotatg)4oxfx(c w. 55g(hr/w gqsnxing 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 kn7,tigstrz 1 8t2mo/ generator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The mvl2+r,5k+ pbeep+s r cotor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operatesf.e9si z t)656sw zli+zey fc:4r e6qn on 120 V AC, and when running at full speed it generates a bt + f 56sl c)46 ne.9izqiswz:efery6zack $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected 1izpzcp*5t* /rf- sds to a 24-V power supply. The operating current is 1.0pp /*zd f isscr*zt1-5 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 connected to a 24-V power supply. T-wc.,zc j+ okthe operating current is 1.0 A at full speed. What j+,cc-kt woz .is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power suppa/q5ccxjf68 rre x2 (mly. The operat(fcr8 c2r/qe 56xjxmaing current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltag kzg;wu /0+:pthnpmx )e 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+fs a;.mc0.jgode e6) rv s:ck 14 A to flow in the secondary. How0 + k:c)djeoef.msa6c g r;.vs many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 11kimk ou+( mrzyf/:p ;-0-V primary if the 24-V secondary hasm mzpy- ;o/k:fki (ur+ 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 zs1.wos ut(7s-turn secondary coil. If the c (w s.otu17zssurrent in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assumin/g9nbdd ;rv9)/c 6 nzhg8ym vng 100% efficiency, how many a/bv)c 6 drh9ngv/g;mdzn8yn9 mps at 24 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 provides 75gbjx 44 ,,hv fyf3lm(j00 V at 10.0 mA. The primary coil ov (hxg, b4fy m,jjlf34perates 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 tumca (k55xvf f:rns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is pre:v f5 fma(5kcxsent 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 tuz.-zke7d5ss; in9g mw.ov q*srns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the second;o- k m*zz svs5.ge9dsiq w7.nary?

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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 seconvf nt y163k6(tjcxjt4dary has 200 turns. If the input current at the primary is 1061t 4 xtycvj tn3fj(6k0 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 turnsj ldt1pbo 3,*c and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expelp1cbt*o,3 djct 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 hasil rdb/:l -1hs 200 turns. If thes-: bhlli/ r1d power input 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 uwd58csw7 kcu0 0i:zz/8m whf120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if them7 f:wki8cdzu 0 wh580usw/zc 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 z y9) vhtgy8 )6loyg.;m-bcccusually stepped up to 4500 V by a transformer and transmitted throug) vz y9b;6comt -cy.yc g8)ghlh a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stuis84u iv1wd: p/o5kxepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find :x1 58vous/dwipku4i 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.q-afo7q :hhm 41 femeulr+3sm( z5zy- A generator produces 100 V at 70 A. In order to reduce energy l e 54hsme 3a(z1+q:l-huo f7mmr -qfzyoss 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 5sutm:*3n57oxwoa5g xo mej 4e d7c* ;z2.cfuc0 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order3x.o :ze oeu*7oud5x4*c ;fct72 ns5cmmaj gw 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 at 1000 V. d,cc m 12ok0hnHow much less power would be lost if the power were transmitted at 3000 V instead of 2d1oc m khn,0cat 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 -oh7d dj/w; lx:r:ys.2c : 4 xrperfyobe transmitted on a line with resistance of 0.60 W. To what vo yy7jxlr oxrs/.: f r42h:d;pco w-de:ltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in the cbj3 -fn/7c rqkvo0xb,jt5w s9 oilkbo0c7f,vn3 xt59 /-w jjqsrb's magnetic 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 inducdip*,auy32 vwtor. What is this circui3vyuaw,*p 2i dt'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 circu0kkwh veg (;i*9yr., sjorg;mit 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.12c 8,zbem s/cy)eoabxw ie1zlr4 t(- What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed/*gdthlch+1n k)s8rnwj4-c k into a 120-V AC outlet. What is the resistance of the lakt)gj-d81 n hr 4sc/h*+nkcwlmp?

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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 powerq44wqpudw 7*h5nu ;kte)s 5d x supply. What is the peak current through the ree5 x uw)du5*sqd kpt4qwn ;47hsistor?

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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 connected6 x-/ drj )(2tuo7vsvs:h yzjd to a 120-V ac power supply. What is the power dissipated inu27 vzd)/rht6:jjsvx ys do-( the resistor?

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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 res ocpdhqyzh;j;j 9q)jf3dp)2a 7 dcy 4+istor 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 alkpy2f1(r) kw 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 jnr)2(t62irf j ) jdsf+7ztcv a 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 a 1.0-j g g8q6frc x4x.2mmg+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*gaft + (d3thq1uj q6f 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 havc/ 4e)ijog9na mck+ r9nw* 2ffe 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 aqfywm4j+uj4x28 .ap at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor w m11mrhx*8liv m 0/agw*vmkh;hen 120 V AC at a frequency of 20 kHz is applied to ilr 1*m*mva0 w g8vhk/m mx1ih;t?

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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 te w.e k- p7g0v;tyye6do 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 4.7y.b tubn nntp6zb9eo-*((t x7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at 10 l:z 1g3nyjg026 prhk pkHz?

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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 capacitor have a reactance of 1202a:/rup-z smc7;li jx0 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 capacito8jb jp+ q sat-y.5pt-xr be 100 Wp5qj.8bp-sxt yajt +-?

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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-mFd a pcw1osxxa(+fg5/2 capacitor 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 circuitovlm *.b;fz 8 :fdemq8 with 12.0 W resistance, 15.0 W inductive rom8 :q.lv;fzmf* 8bed eactance, 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 9f//g qd09 cobdj0vvowo . 5ria 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in so fc/v9ir b05j90vgo.odq d /weries?

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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 100f20l;ajrlwkg5 1- f qcwz/i* o-W resistor, 20-mH coil, and 1.0-mF capacitor are co-j12fgw*lkrq0lw/a 5ci;f z onnected 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 connect ggi)fu6((ly ged in series with a 20-mH inductor, what is the impedance gl (y)ig(f6guat 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 inducpbi-,bnmh b(je pl -6-.q+qkr tor, what is the phase angle at 1000 Hkeb.qi+lnp6- pqb,bj-m-hr ( z?

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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 cirhoza/1 efb;4pcuit with a 20-mH coil and 1.0-mF capacitor for a total imped f1abo;z4h/peance 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 8ke zgc5w x.r)o3q:ghis needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 1105w.k qoe g )grczx:8h3 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in qw m -,eeh*ld7series with a 450-mH inductor at 5000 Hz for a total imped,l-eqwd * he7mance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz f0u( mu)i nlb( v1euhmfe4gl9 9or a total impedance 9(4i 1fumeh0uvbn(lm9u le)gof 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF zcziu vl.m8 1*2n/. yip.se sccapacitor. What is the impedas8.y.z l/mc1e*u.icin v2 zspnce 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 1.0 kHz for a totg r2/u*n7fw pmal w2nm pu/r7*gfimpedance 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 capacito0 44rdl :21opxmzir c nx3rn3nr at 1.0 kHz for a phase r:n2 1dxnp3 4l3nmozcr ixr04 angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in serihr4(-4je; lwh8 lkjm jes with a 30-W resistor at 1.0 kHz for a totalwhjlm-l r4k8 4j;jh(e 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. 3t,50vccp pfp m5 kmr0What is the phasevk 0,pf5p m3 cp5t0crm 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 cois96stz1 yxx1c (, 5chyav1yxpl, and 1.0-mF capacitor are connecteysht 9(1vxps xy61y 15 czcx,ad 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 consistx yp6 t: 3i l1nna1dhqxl;()tbs of 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 x aht; i6b:q)11x3nn dtlypl( 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 reach7 etwb0*,)v l sxbzb-tance 30 W, and an inductor of inductive reactance 0lxt-w7 zbb e sb*)hv,30 W are 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 circuit containin ss5,ck.84z fe0vhprl/ ace/q pm8ey:s2 uzd.g a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, whm/ z cqsc0lp ae8urhs .z,ypdke5./f8:2ve4s en connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a pdebz 5f*ejoq;an*pl35 k- 1onhase angle of d-ejp l*zak35 bfo1;q5e n*on $40^{\circ}$ 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 mF.s66u0l phnz7r At what frequency should the circuit be driven in order to have maximum power transferre7l6 n zhspu0r6d 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 ci 9p(h9y hskwd*rcuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive read(h*ph9k 9yws ctance, 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 cid0l;l/cu2 al omhy2-c rcuit 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 and abmj xa;s2y*w**t 7yfg resistance of 30 W. What is the power fac a;mys **yw7tx b2jg*ftor?

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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 faso +l/gzi7b2nctor for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, anngosb7 2l+/zi d 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-mFzekln 6t.e7l 0 capacitor and a 15-mH coil in series?6e e.ltn0zk 7l

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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 ndgr 2*nkyy(aq2mq v ;srd/,* in series with a 4.7-mF capacitor for a resonant frequency of22/ym g; raydr(qnv,s*k*qd n 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant /rw7 fpffvffaa lz3+1 6pa)-o frequvfr 1aapaf6 )+zlwff-3fo7 p/ency 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 series with a 30w5o1yprkjrjqhh 4 :duafc-d 9*yfq.6 ) lks+5-W resistor and a 40-mH coil if the resonant frequency of the circuit is r oawh6fhkdy-s1)pku+5rl fj.c* q:9qd54j y to be 1000 Hz?

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