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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 80 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；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。本试卷的直接作答链接 https://51fly.win/test80.html
 作者: physics    总分: 142分  得分: _____________

答题人: 匿名未登录  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 unitsj :61i hj3 x idez6iw0wn65kgc 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 induction states that the9e5nynexb3 )lao h dqems 6*i8l)m , t2nv0s;c $emf$ 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 produces wham2:+q.qsc v- ey,e +z oyiui;amgmn8(t kind of change on the izy;+eu qme2cny a o:s8i,. -mgq m+(vinduced $emf$, 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 prod 0g3llr ii9l7zuces what kind of chanrllzgi397 li0ge 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 produces what kind ul1e3ct +ndufq *e e72rkj;2 xof change on the indu*je 2uncqtl17;3u2 fe rkdx+ eced $emf$, 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 fh3jifbo:0z8a7: mgr6r t ;iplrom 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 current in a conducfwp 7w/d2h 7fwtor will be that which tends to produce which7f7f/wdhwp2w 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 dw0qzq ce72 b1magnet is held above its center with its north pole pointing down. The stationary magneteq7c12q0b wdz 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 o22 y vlu/1lwzu2*zjtp n a horizontal table. 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 viewed fr2y2pl2l1 /uvtz*zu jwom 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 ft wg./i;oxq1t ield vector points straight up. The magnetic field vanishes suddenly. Whenqtwt/.;g ix o1 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 rvdipvx sv t.melk 7lt;)+ 3u4-egion where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When v. ;xuv7lksm4 3lt dt)vi-pv+eiewed 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 5 nv:/ydj o;kdthe magnetic field points straight down. The magneti5k/ ;yddon:jvc field disappears 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-ivl6wg,,xqa+n05l9k7 intlh)kt k 5kwncreasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. Wheh5n+l5)w,ga7kkq n0l,x t96wk lvtikn viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering first. eo92eigp 6t i2t*kiq( As the north pole enters the wire, the induced current will be (as viewed fromt 2(2iipqok*get ie96 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 a wahz-8p pej73bout 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 lhjp-apw7 38 zeoop'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 consta1 ge4ns((z3dsh fhnp)nt angular speed about an axis whose direction can be varied. Id1hs(sfh 3n)z4g pne (n a region where a uniform magnetic field 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.g x:wz)22+ ejah7xcio
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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 81ria5v(*o +gyxa m*tao6ruv awy,n) that 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 magneticu .s +u,f oqdi z4k2 d 6i;cc4qd16ebtlrhso(1 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 east-west direction) is movk.znqhk, 2 1-9svcxg ted northward at constant velocity through a magnetic field that points straight9 vhg1tkqnk x2.scz ,- 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 cd egd(+mr* 9of/y,:zimgv r a:onstant 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 q1qh/rw3(yx/s/c ( mjvs xr6etransforms

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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 (qnfwy w7x2 s5revolutions each second. The frequency of the7 w2 (ws5xqnfy $emf$ 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 5/d wjjlf) zz9to

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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 thaw)xx v94fsgycq7: j 2d4xd ,nit

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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 t-actj6ov;zw l5.ns7xxg0:-e )e evo coil contains more loops than the primary coil thto7 6 xzeewtxg)5c0ljn -. oa-;:vve sen 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 contains more loops than the secondaryspzecw 7 jpz5:u/s5 ;t coil then it isss; zw: tcjpzu5/ e7p5 a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power in6 udm 9heiba58put

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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 circ-lnq h)9)4k mtvzovj 0uit,

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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 inductory3s 0*gtkj7 6lcifk;/g p .ajc are connected in series to an ideal battery of constant t3kilt7ys .0p6* cajkf/c ;gjgerminal 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 connej )m :w(i(q,t s 9hmowtf*pds7cted in series to an ideal battery of constant terminal voltage. At the moment contact(imwsqtt oh(7fp,dw: ) mjs 9* 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 witzcv*azs7zg5qn 7/ey 6(xv,rk:x o b7qh 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 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 resist4a zxmyvto ;*.ance 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 sd py3naa+ 6gk)3k+zuueries to a battery. The time constant for the circuit represents the tk a+z dknupyg3 3a+u)6ime 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 connect-.9 e/r ahfmb:f l1hd ugaj,2ped in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represdh/ ugl9-2j:are,fp hf1a .mbents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units excep+6 z,;ud o8l4nz gnwyct:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuifcg+ ;v/)+pu o5wavxyt, 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 s(-sk pnclp3l 9shp*7yeb9 vz /upply. In this circuit, the currentlcsk3el9 p-sp /zphb (ny *9v7

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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 bziq77v0 m ev,ly what factor when the frequency is trizvm 7e0 7,lviqpled?

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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 inductolwjzwxf,f-vjx/ 5 g( * :fgl2ur is doubled, the inductive xv5jg, f/u2x (lw:lg-f f*z wjreactance 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 across an inductor approaches zero, the indut-d4oas 6fct 48t5oalctive reactance of s 5d-4altf cto84ao6tthat 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 pyy0r2nyli77 iower supply. In this circuit, the currenn2l 7yyr i07iyt

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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 when the freqz,u p7v4ke g)huencyh7p)ku,zgev 4 is 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 the AC voltage across a capacitor app+i i1sgs(j (u*zrlk)yp 7 ry.lroaches zero, the capacitive reactance of that capacitorllp7*.gykuz1)si s jyi(r+( r

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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 ofx( i 7c)linm8g + hgm1+xil1ho the inductor and capacitor in a RLC series circuit?ico g )+mgln1h7 hmxxl8( +1ii

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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 circ jare+./vvvo-dm5u 2 yuit 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 circuit increaseap/j.tv;/ ( tvs:hpyh8d m9ff s if R increases. W/p f y8jsm /t9p;f:(.vh hvtdahen 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 in0uzb24rm hxv:8vokph w6* gnd gu3i;5creases 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 impedance2fpxv41rtszwkol4 3 dl2 c0 i4 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 theh q .:aer6 8sq gkk8jnhwj*61o capacitance both double in an LRC series circuit, the resona.1: ajnq8sqr6hokew8h *gk6jnt 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 that is driven by +;bxx54 apxuzan 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 RLCjn,a/p 7 qnvw( circuit 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 dx q7g;pt 36jduniform magnetic field of 0.20 T. Find the magnetic flux through the loop 6;g jqd 7tx3dpwhen 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 rotat8h+ oemf )b, /lkmfyr ko rqdo8ox*97*ing in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of th+x)ehmf orm*8q, 97ylofo bor 8/dk*k e 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 ndyj f 8axka2ry2t850 ok,o7mby9 ;ax m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic y 8daooxk2;5a8fb yak9 0 2xy r,n7jmtfield 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 anzd2 hkh rct8i3rj(h(4 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 coil changes frota6,;:x6 igkqk8 htag;ipm( wm $4.0 \times 10^{-5} \; Wb$ 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 2-b rcn7ofnl5)8d2l6gw ce qf;00 turns of wire on a square frame with sides 18 cm. A uniforlofn7fn rc2w65c8g e;qbl d )-m magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns an.s;o6gje91-qsy:iwciv0llk5 cw e 9g d 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 areo -2yelwc.6sd a $0.20 \; m^{2}$ 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 horicom /h6.5ck nyzontally at a location where the downward con. y5oh c6kc/mmponent 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 bx1dha9(h*, ydj:txq,)f* t )ikpfzm x ar that is 2.0 m long rotates at a constant angular velocity of 2.0 rah*j x(qpt,z :am1yf) fx9)hxd* td,ikd/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 loopsp 9eedar3:l( raup 6-c and 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 obbf,hagf2 avqq9oo /+h 2/8uwf 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 rectangular loops ohwck nmpw(x .tf74w1a jl0q8-n 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 uniforw7k48 .a(ftjxmwqp h wnl-0c 1m magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wnnfz 08,2pcg zire 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 generat,; rg0un6vltsu, ij/lyx 6 k f2/y,zdcor with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is jfkzx26g,,/u rynl6cylisd0,;v /ut 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- n7gj, p4xnjr 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 rn32/bzi : loulesistance 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 resi-pg q0s8/ ef v)iok b.o82afj gpkj9.jstance of 6.00 W. The motor operates on 120 V AC, and when running at full 8sg qp-opkj0fe /bjv2 .8fj9g.)ik oa speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0hj,hyk h u63y1h2 iz2z)pf 2as W is connected to a 24-V power supply. The operating currphu fhz,s )haz 2yj 2h62ky13ient is 1.0 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 connected to a 24-V power supply./9 2a/ubl7rhqe,0 ezk- qsm3 k(vfgny/mzt f1 The operating current fv1qlmr /e 3 k/-fqag2z(t /m0y7z9nhsukbe, is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power s5 kinu + -/uwry:l4lebupply. The operating current is 1ywr4u/5uin :bkle l+ -.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 nqm* 7 vnh7uz)a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transform 8z-/ekrl5y9 xley;eier causes 14 A to flow in the secondary.;exzre- y5i k98ll ye/ How 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 1vkhbm 184j.nx10-V primary if the 24-V secondary has 100 tb xnk18jvm.4 hurns?

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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 c e5ybk.sk bhp v5sw48nn+h1 5koil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in + v.8en5451s hwkk5nbbsphyk 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 ia zk:*r l;kgm8 eavl.+5gv jf7ep a:5en the primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the seco5kgj: e;v+gze*8: plalv.7m akeaf5rndary?

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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. The p mic.o8d30pprrimary co 83.0cdiromppil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its 3j 1d..rzkxeiprimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage.d jr ezk31.xi 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 primarmp. ;mq p)n;ady coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what curr;am .;npq )pdment 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 secon p(fggm :qzy782qwp3c8scr;mdary has 200 turns. If the input current at the primary is(rw7g: 8spc z ;mp 3mqcqgyf82 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 turns and its secondary h( d63dkm tun t96 0*ocyrrgqy9dg/yugs,kt6 5as 200 turns. If the input voltage to the primary is 100 V, we can expect the outnk t(dgc66g gs k*/yd 9d,rm tuu305ryt9qoy6put 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 transftxf )*8q wme/:bzaii8 ormer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the seconbez*mf8i/q x w8 ):aitdary 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 curreni86lxec *y0 hft at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the sc0f h8iye* x6lecondary 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 stepped4szpm61g3vs a9wh. by up to 4500 V by a transformer and transmitted th1 bpyz.6wsh 4gv9 ams3rough 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 vojok,fhiy qdk;u53 oh 8)ko7 y4ltage is usually stepped up to 4500 V by a transformer ano5yuo8 ;y d3k, )qo kkijfh74hd transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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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.n ng1y c2jwlg, nj5yd)g j,d i+gl0.l160 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 witl jnyjgl1cn0) n,g+jd. gd,iw1 5l2 gyh a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 9rd. bf/ajig2cg:m:x0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission lin.9:ia:b/fxr c m gg2jde, 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 ri :tvye*p9)b.z nok5 V. How much less power would be lost if the power weey z)9n :vor*.kt5bpire 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 betpmkvv*yu91 r5f: uj:6 wc6y8vs1 iue transmitted on a line with resistanc*myfc8uv16u:jw yeivrp5s9 ktu:v16e of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of 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 sk nvycy3h fo)+ ;,n3aytored in the coil's magn)cfo ha+,v ;3y ynnky3etic 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 1 )k2 ,xhlyl7i9y0 xfgrlb h(s(8-H inductor. What is this cii0h9s(l2l)y, hl(gyk 7r xfx brcuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where tnrbg;g: a997l icc8ko he rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak current?u+6 if t3 xzt71xjbjr(

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. m b jle+ pf+)gdn10to5dx).o oWhat is the resistance of the lammtodo+e)5gxnjo.0f1 b )l +d pp?

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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 c zi+x3ka9e y/jx;m un5onnected to a 120-V ac power supply. What is the peak currekj;53nzyx+ueima /9xnt through 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 supply. What is xudwms z0j lmw*k)s,48 ;x*lyz;( n hkthe power dissipated in thhl0zwdm, ; zykk)m4jxnlw;x8 *(s*s ue 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 resistor ztq8w 1-f6:*xmpk kmw is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistow 0gtlo g3.fb,r 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 p / +2fartp2ttn qh:8nj6oy5xresistor 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-mH indic8.y r1pipd98.dy p buctor 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 cf3.j18nux btzoil 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 cocfc.c,on9; jkc)c tys vo 5*7jil 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 15,ty6ba +xn- qv7 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC a xy .;)ere5;6otxfc so rs3p7gt a frequency of 20 kHz is applied to sf. poy7;)c3 toxg 6re5exsr;it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V,pi,9*isj(cqzo ,r/om)d5yw 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 capacitor6dco:z5nhko: f + z8xzl39dv u 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 reami57y9koz l o xudl6 a9mu6,x4ctance 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 c-1zk khd-j-* kan mi8uapacitor 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 capacitiveki+t yk7 xp qdae69e3) reactance of a 0.010-mF capacitor be 100 W?6ty)d+k9ea q i3xkep7

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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 thr2wxt:2k: qp jwpxm05 gough a 0.0010-mF 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 anlu+.hl3 l vb/d ac series circuit with 12.0 W resistance, 15.0 W inductive rea.lh du/3l+lv bctance, 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 100-W resistor, 20-mH 5u mw ldavws2)u3 q83h75 yfqtcoil, and 1.0-mFva5u3538d f2w u q l7wsmqh)ty capacitor 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 -mwjlkx wva:a3hrmej3j ;9;;8bm tf ;resistor, 20-mH coil, and 1.0-mF capawt:xw j;m3;; 8a jml jah;mrk-ve9f3bcitor 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 is6zbmc iw+l(w . connected in series with a 20-mH inductor, what is the impedance at 1000 Hz mbz6.lwwc+( i?

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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 wic+mrist+86 cktfvos92s3 8g;t cln t*th a 20-mH inductor, what is the phss+c69tg 2m8ictv*kolc 8r 3fstt +n;ase angle at 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 serpr)ab5f jj) 7mies circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 Hzb j)f)j7a5r pm?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a -qhunrp7 2:h h3f urb(2tfb)n 100-W resistor and 15-mH coil to get a total impedance of :nf uq2hb)pu-nhrth b3 27(rf 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz fort8s:z )rren2 vwdap) +jy.m -a a total impedance of 40000 rn-t)z8ay+. rwvasm)edjp2 :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 serieg d96xmus+1 a txdxvh.+ xzcx 91rs;b8s with a 100-kW resistor at 1.0-MHz for a total impedanz6;b8 g1ur+h9tx9s x+xxdvd xam.sc1 ce of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected ie+ vk t+ bcs4v1a5nx:sn series with a 20-mF capacitor. What is the impedance at +a+4t1sxkv nse cbv:5 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 seizgw9trr:a: t2yc+ :ys8mdx 1 ries with a 10-mF capacitor at 1.0 kHz for a total :a2 gixr91 t z:ydm:8wrycs+timpedance 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 nee(b ,1 awf1cse ghsd47b ndh+5l(lep k4ded in series with a 10-mF capacitor at 1.0 kHz for a phase angle of(d+,hs4bk4fhg albe5nl p17 d1 cs(we $40^{\circ}$?

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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 al 4r 6t 8 zw0 f)k:udw1yulhktk4(pp(h total impedance of krl1zk wlf6 yptu (pdh(04h4k8: w t)u45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is the phhi5w8 ;pbr5v1: bdtspe (6wxmase ang1p;hd5i5p8vwb b: e(mxwrts6 le?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, an skm 347kz 84n1ujpvi9v(ubt gd 1.0-mF capacitor 83m7ij44kv1u pv gtsun b(z9 kare 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 10.0-mF capaci i-n(1+ lb;jw wil5gcitor, and a 0.355b ;liig-jc+w(lin w10-H inductor. The circuit 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 reactanc 6fde6/bwf. . yfwlq(ye 30 W, and an inductor of inductive reactance 30 W are connectedlfqw b .de(fy6f 6w/y. 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 containing a 50-W resistor, a ujshq se36 u(310-mF capacitor, and a 0.45-H inductor, when connect3huj qssue(6 3ed to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase anglen,n5 29or hqv-irj(jx of hvnj-rq r(,2xi j5on9$40^{\circ}$ 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. At x.m so:nz mep/: 6-tnspwnfwn+ -o8 g(what frequency should the circuit be driven in order to have maximumso no:(8e nmxw.p:swgzp-+ntnm 6- /f 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 W0369(vesp: pcx+ -snybsqyb l inductive reactance, and 10.0 W capacitive reactance, whe cs p vb:e90xp-6lsy3 nq(sb+yn 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 c0 a ,+stx*iq8mk nesv6ei+a.nyr +0q gircuit 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 a resistance e ukhwf*;w2u) of 30 W. What is the powu2k;hw wfu)e *er factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing g87a+lb u7jkft6i6et hl e::na 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?+e6bj 8:nga u77klft6ei: htl

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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-mFx;9z /y k3ywxp capacitor and a 15-mH coil in series?9;y/ zk3 xypxw

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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 .grx*fbpv ky 8 )tyegm1hto-4ck9 5x-a resonant frequ k cehgpx.o9 -x)y54tgmy8r t1vfb*-kency of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with hy4dd4 so zl /27ay0wsa 3.7-mH inductor for a resonant frequencyoy4 0da y/swzhs7d42l 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 se+ a,nr tcq8:n7hpawm8ries with a 30-W resistor and a 40-mH coil if the resonant frequency onpah8 7+:q nwtacr,m 8f the circuit is to be 1000 Hz?

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