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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 units of )w2;asydb pxl(mz(m+ 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 tz xghy98; mt rsa*. izol/n;i1hat 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 coi)o8 *pj9 c0cpqmd4n xel produces what kind of change on the induc) ocx d9jmppc0 q*4e8ned $emf$, 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 producw udm2vl mz3p8hv 5.3nes what kind of chamn2p3.3 wdm uh z5vv8lnge 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 ozh;vtq42n5;j x( a wyof a loop of wire produces what kind of change on the induvqzn;jh aty25( o;x w4ced $emf$, 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 fieldj( u) pzqu)mo:y7g uh: 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 conductoryu+h; z)-g6z bf:emc;s7dddq will be that w) b-y 6qdd 7em;hu sgczdf:+;zhich tends to produce which 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 f,7f- 8oqkz/33k qe*ym1d s weyt3euoon a horizontal table. A bar magnet is held above its center with its north pole pointing down. The sta31 w,fq y7dy 33szmq of-eo *ukteke8/tionary 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 flati9*rn fqkq gxq1f41 sq;fl -*t on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches 9ft4 rnq*l* i1sg-qxkqfq;1 fthe coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a tablrp9n/1 hvrdoc.cs .(i 2cd s*ne top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current ins.9ch1.sd ov */ccnrr(p id2 n 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 levea 2sq7 hq48/qia t,4x yzj7axrl table top in a region where the magnetic field vector point4tx sx ,aqq48 jiq za2ar/y7h7s straight 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 ho hehwq5nm;,1 mc /ef.1pa:jhtrizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in th:pqwfe he.tc,;h mjmahn 1/ 15is 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 ho 6jx;xksgdase81 ) -zgrizontal 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 viewed from above, t jd z8a;sx6egx1g)k -she 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 nyzbuv8g d zv47* ,o+xtorth pole entering first. As the nortbd x *g4vzvy87z+ou ,th pole 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 angw**u2lt: q 7epq .avzauv t*3qular speed about an axis whose direction can be varied. In a region where a uniform magnetic field*w*p3aq.zvtq l7 *2euq:t uva points straight 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 rotat h; i4tbjv3+po(rxc m2dt-7xked at constant angular speed about an axis whose direction can be varied. In a region whertxhx(m-3ti o+7 ;bc v2jpkr4d e 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.8pl;jsxw1 mlk6)3c/ si ojz;y
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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 s0pah(kh7/up 00ue*nge /ho( vovod2hat 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 magnetic fielvq)o +fe83 pntp zq8c.d. 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 eav5 s:xcfo 6yigh25gk* d:z4p nst-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the poteyfc k5 spxd*o 6 h:ngiv245:zgntial 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 barsf m wlm17y98j rotates at a 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 tr3q nhblpue1c s ,qkyt56cm;77ansforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The f :(zjd:r0wuwy lh6utg1qu 1e;requency of the 0 1;:16du:thqewgwuur zljy( $emf$ 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 u1eqda( e70,vxo6g6y6j b vz bosed 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 jhrpmw 6(ok,/2arm* 7tz/yhqthat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the primary /ymg . 8ecxq*scoil then it is a*xm cy8/.g eqs

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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 m:ldq( 8.j7f 0jvvmfnwore loops than the secondary coil then it(j:vf0. vw7n mdq8j lf 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, theb4 33usww9 kpshksru.)6 k7j i 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 circ7wso9. xp,fc 0g flpg8uit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery 9))quyaf *d8 cqlekv+ of constant termiul8v9dq)f c*)y +a kqenal 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 connected in series to an xg3h 6l+uuv h)9hr: enideal battery of constant terminal voltage. At the momexhl+:3u9rv)e6h h ng unt contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance Rfz ti :cy17es; 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 indu* sqpfr,3s*h 6m6 uqyjcbkgah(a+5z +ctance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a bxv60pm 6o bwdfh+knrj397bznt uws 6f2 7) ne*attery. The time constant for the circuit reprk6t3 7 0)x6 pzf meb 9dhurn6snnw7+o*fjw2vbesents the time 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 connected in series to uy;w 9v5 .j80qb fnqzja battery. The battery is suddenly removed from the circuit. The time constant for of the circ fb58uj9jwyqvnz;0 q .uit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the byihf5ym42 ,s 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 tw w(7d2l7u arwh9cp s6o an AC power 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 c g4:uqk o1+nd*z ark*ronnected to an AC power supply. In this circuit, the currentkq*k1d raru: z ng+o*4

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance ixhb*2 jzb3z a+ w0;jsfn an ac circuit changes by what factor when the frequency is trjbh0bx3zz ;* +wfjsa2ipled?

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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 induq: kf*cc a3nr6ctor is doubled, the inductive reactanc 3ar6:n*kfcc qe 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 zerf a +b;n3tz)euo, the inductive reactance of that coizne;fu)b +a 3tl

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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 supply. In this circuit, gp 3+ 23 kflrbbohd9l.pk+hk6 the currehk3+2 +l fl6p.3 bgbrko k9phdnt

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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 circuitjgy s/i,fko gq92z;f nt-(q9g changes by what factor when the frequeogq2,gtj9f;n qzifk sg 9(/-yncy 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 aujv8;1wsb1s *8 jm uxrhp f7y3p) 9efepproaches zero, the capacitive reactance ofx hj8*m fv;j713 e)9sbp1sfe wr8uyup that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and8ea1-kat7c la igj3 +i capacitor in a RLC series circ+ae13ii7t-a j8ckagluit?

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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 definja95vj) 7cy5 7hubkaced 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 impedk . at;m2g,vgbnr8+sgance of the circuit increases if R increases. When+ntg.ab,svk g82r;g m 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 inc6t; ej p h4 9g,xf*v;mf4rvjnxreases 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 impev bd1z z8py.h2x98qdvdance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both douv1wvw1g-e e(uf p as48ble in an LRC series circuit, the resonant frequ11 fe-4vvwew( g8asu pency 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 /d nqhc (c61f2sl*kba7yezovii,e7)by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs wf5:c,a 4 uk o;ft)y/zwnb 4oz/qujjf6hen

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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 o:35p+ fm:o)ahl+g ya6t ondfqf 0.20 T. Find the magnetic flux through the loop when the plane of the loop and to :gyn3 5m +)dh lq6:opataff+he 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 magvt d,s t(wr38mnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and mtt(r 8w 3,dsvthe 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 radsifsk tj4x +1/ius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plank1 i+ft4j s/sxe 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 is redth/6 w8d9we-kyw):by hq g xy;uced 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 f+o)hak d rc(2erom $4.0 \times 10^{-5} \; Wb$ 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 sides 18 c j7gc j1cet;m)m. A uniform 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 averag1tg; c)7jjcmee 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 and an a6vw(7:sporpxo53 )gh bd4xw 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 a co*j;a)3qf5f;zldau b8wo-mnd 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 sgaen4 l-k ttq7 6124c yjnbzir.1ic/opan of 60 m flies horizontally at a location where the downward component of thi 7-1/e lai4jg4nt2r otcykn q cb.6z1e 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 angulaqz:,+r 0scxu sr velocity of 2.0 rad/s about a verticur ,sqz0: sx+cal 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 jwo./w 8n5obp 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 ov7i8ych4ji z6 f 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 loo5 cn0gh*n0t/bay /cojps on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, w/gno00nbct / 5acjyh* hat 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:)6wkmpn7 6 jw6*w wuz 2nxn+txkk,ej 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 simplbxev-:y0va4)ivfm g x )q/+gqe AC generator with an output of 12 V maxiv)gg vx qq-y:abevx4/)f+i0m mum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generatorae, d2j8tb7 hg 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.he(65 vm0m xze00 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 resistance of 6.00 W. Thrjf2), kjrdxqi)x w21e motor operates on 120 V AC, and when running at full speed it generates a wxi) 2df) j2jx1,rkq rback $emf$ 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 resistancdt n f0 l5tgp/33bjv+igo7k7be 6.0 W is connected to a 24-V power supply. The oper3/in37ggtb+fbtj05v 7p dk l oating current 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 resistem cc:t fj9-uxa9g7i 6rc9 sr6ance 6.0 W is connected to a 24-V power supply. The operating currenx-rug 6mc siacecr9f : 97j69tt 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 xfc1umijfi) -v n:/h) resistance 6.0 W is connected to a 24-V power supply. The opera1hi) :-iu / fmj)cfvnxting 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 be6 ,-w ;p92kp )mias*aaeztgvoltage 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 q7 gpyu1- kn,om tt(x,flow in the secondary. How many turns are in the seconu7 ytkm,tq-,nogp (x 1dary?

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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 necessa.)beb sgw9i79 l mstu/m7.c pxry in a 110-V primary if the 24-V secondary 7g7pb.)ws /9mb.tc msle 9uxihas 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 2kcs*p:nfcf+ pi+ , yd/000-turn secondary coil. If the current in the secondary is 3.0 A, what is the currens+kn *f:f ppi,dc+c /yt 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. 3sc*rn 0une6u Assuming 100% efficiency, how many amps at 24 V can fl3nr 6u ucs0n*eow 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 7500 V at 10. 4bxk6tbq;a (wyz1 n;f0 mA. The primary coil operaf(;x4bq6 wn1 azk;tybtes 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 coil0iji8q9trxq29a+u2xc jw s1w and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?0wuw1ti9i2a9xxrjc j qs 82+q

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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(z8tnq h-qhu :ukpw4wc7)rr+ 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is pre -w z)tp+h4(q8w7cn:urqhrk usent in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turn tya)b kc;3 )2amcaka-s. If the input current at the primary is 100 A, we can expect the oact2a mc abak;-y)3k) utput 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 p*z*w 3edm 73ueqisc4has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the outw3*3 m*qisud47 pceezput 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 tra a6qv2yuqc7 ul/r/f+zb )euz/nsformer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect /vufzuc2+ ab/ze y 7rquq/6l)the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. pa 2f l4:w3m 6jk)psqqn xp-bt*3tqvl)ss;p, 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 the primary has 200 turn l*v3ksspp4)lqqp,tp:)t; b nwq6-32 s mxafjs.

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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 Vd4n 96apfpvp3 . The voltage is usually stepped up to 4p6pdpf 9 3an4v500 V by a transformer and transmitted 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 cur2o x4 ygi+zjd0rent 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 percentage power lost in the transmission line if the voltage is not stepped up.jgo0dz +2yi x4

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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. x ( lu:vm9wg1bp6q+a tA generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with q :mub+lgp1 x9t wv6a(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 tota(66mbpr nr im*l resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer im(ibnp m*6 rr6s used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power wouljww d*c4 3eg522owskq d be lost if the power were transmitted at 3000 V instead of kcgjqed24 wwo2 3*ws5at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmit)+1 b q9eqb bjbkru4f0ted on a line with resist 1qbbq9jf0 4eu b)k+brance 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. ti yfpk 1st23( ,ottk) (syoe: How much energy is stored in the coil's eksy12tt:yifook t(()s , tp3 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 6.0e cc2w6-rv i0t-W resistor and an 18-H inductor. What is this circuit's time constant? 6ice -0vrtw2c

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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 the rms8ro9 v i-bst0v 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 current3 o74n+ie mlt vkv.c,j?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resista b7i oa(62dnp10 npnlhnce of the lamd(ann6b7o hin1l p0 2pp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is t6m7cimd3.97r zq pk cuhe peak current through the res 9ku 3rdmcm7zipc7 6q.istor?

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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 acheikxo2 wy3 7hxdqo 0i- 8sy3, power supply. What is the power dissipated in the resis2iio we3yq7dskx 03-h8hoyx,tor?

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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 u q fa sb07p;cta k4.g(trj)2xis $I = 0.80 \sin (240 t)$. 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 edx3,*nho pdv12rwn- 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W :nt/ n (zlmexn+ul,2m 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-mH inductor at 60 Hn,puvl1gn -a+zpl4.zs(y z- qz?

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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 re2bj0co- cca-8a0eqz4lfhue6i 6ww . n actance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive r nxlwl;pkf-cd2 fsm(*) y*.u ,kvko4keactance?

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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 ab-tnrya 5 2:xq56hqdj t 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 whyk-k d n63gv4zurm/ufzj;p 0.en 120 V AC at a frequency of 20 kHz is ar 0uv;4kmzyf/n.zgd36 kpu-j pplied 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 through a 2.50-mH cofh( ts+mkt 4j2il 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-mF capacitor a-j n8, gqstadh0f-xh1 t 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 ncyz .m;aej5:n1 f l(igeeded to have 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 capacitor have a reactance okf -.0lsq2czk 69o6aq; h*rlz c8oxtof 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capak :3ff5w8bi2ho 7ka yigh +(gx6r g1egcitor be 100 W1b hwfyggk7kegx3ghf5 ia8 26 oir+ :(?

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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 x9z509sxk9 a dxte: k.eijad9through 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 an ac series cir o++utkqds3lgk+ ra;415jj ;djyx q i/cuit with 12.0 W resistance, 15.0 W inductive reactance,d j3x4a;q uq1l+y5oj;jt r +sk /i+kdg 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 resis+t 4(2tgk nesstor, 20-mH coil, and 1.0-mF capacitor are connected ie n2tk+g( st4sn 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 e9:g7;fedpb q resistor, 20-mH coil, and 1.0-mF capacitor a7: dfgep9;e bqre 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 connec *nbr2u/ln2j) dxe3iczb f;g c,5.bhjted in series with a 20-mH inductor, what is the impedance at 1000 Hz?35 cun x/d;)b ri,hbnljg .b2*e fzj2c

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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-m:v)qdan 4(xrf8q:ya2xe v ob2H inductor, what is the phase angle at 1000 H4xrq d:fvy e28xa)v o2:b (qanz?

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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 wue *)a* l)w;7-t znk2qgniixrith a 20-mH coil and 1.0-mF capacitor for a to*uz-*iw leqxtk)r) 7 ign a;n2tal impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances i,sthomo2/ny b8rdxt /p j+ 6g/s needed in series with a 100-W resistor and 15-mH coil toj2 t /+hyxm o gdps,rb6n/8/ot get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 9zrcw)v yi+jt 7*,s cq5000 Hz for a total impedwr*+ zsj)cy9 qvt ,ic7ance 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 10v z/iokm+24 r mls0hl.0-MHz for a total impedancek04orl0z/hm+s v mi2l of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-m5ckdvkzaa9dru,/4+ -k+heki .v /m54dn b afzF capacitor. What is the impedance at 1000, nc+afm/ a 9i+4zkdhvkk.kdru d/ - b5ez4v5a 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 kHzock5u0(t yo1 v for a total impedance ou5 y ok0ctov(1f 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a p9uq ey99qbt cgc8ag cw50j2 ti+b8 m ;vq9bbu(has99j8ag bttcgb q5b+yq9ibvw0ec(mcu8qu ;29e 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 nexq83yk0 wu yd3eded in series with a 30-W resistor at 1.0 kHz for a total impedance of 45 W?8q wy ydx03uk3

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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 t6*1 iwllta4mxhe phase alt*w6ia lxm 14ngle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.016lk(r /yo3o4wpu, 4brwknaj-mF capacitor are connected in3 o4yk r6ko ,w w/ajb4r(pn1ul 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 capacitor, js+)7 u y l2kzhd(npg;and a 0.350s)(nuldhy;gj 2 kp+z7-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 r;ovq-hci g-*g dtf0 fja. ii9 mco.+i*eactance 30 W, and an inductor of inductive reactance 30 W are connected ci9v*ficoi.q0+dai- h t- .;fm g og*jin 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 ci0; yuq2,z*bd azx b8nlrcuit containing a 50-W resistor, a 1qu2,* n blxb0; 8yzdaz0-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a 8 549r;hsoq b8;e kecphpzb6ephase angle oheeqb8s4o 5;9ck; b8p przh 6ef $40^{\circ}$ 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 whaxq0u0h-pm1 chrve4g1s2ip m1 t frequency should the circuit be driven in order to have maximum power transi0042cgmpvxhp1 1 ue-h1s mrqferred 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.:iq j)br2* bnk0 W resistance, 15.0 W inductive reactance, and 10:iqb2jkr n*)b.0 W capacitive 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 a(cs 7wz 7;srbsi/bl8 xdim*c -n AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and 3ujja 1)7nm acuvsf-e5w 3t(1asrk (d a resistance of 30 W. What is the power fac 5 -jm31ratun)swfvs73u( da1jkc( ae tor?

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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 a 5 k85qhc:*3ifiqcjk )l0-W resistor, a 10-mF capacitor, and a 0.45-H f3k8q k*icijclq:5h )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-mF2 k5chcel s)k oar(m1 2rw.tf) capacitor and a 15-mH coil in series? t2h)r2)we5smafok(kccr.l 1

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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 freqt9fd (k ubrmv p71w8t, )2iqm:sjkx ;x,yjk-uuency ojs7f(tm;:xik2j tdb9k1kqmu u ) v8- x,r pyw,f 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 inducp *p5cv:i au;gtor for a resonant frequency:puav*;ic 5gp 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 30-W resistor and a 40-mH coy y d) qgl5xduz(gh1 -c04 2ckpj93yvdil if tl 0gpkuz1q c9jv(xy -y2hdg4cd)y5 3 dhe resonant frequency of the circuit is to be 1000 Hz?

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