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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 mpl(nci6 ,nr5 t2uam0cagnetic 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/w wn7bzt9 1rst2wu7r that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire innhy:0n (n):q wz,fnzc a coil produces what kind of change on the induced 0,nc nzfn(:w q)n hy:z$emf$, 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 : -ic/: ph3voca98 enq,ruhow of wire produces what kin9h8on-wop a,chuc :3i:ve/rq d of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire p xr3lp4 c9q1fr6 e:fc7z)suqdroduces what kind of change on the induced drp7cx4:)l rc6 q3qf9z 1sfue$emf$, 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 field 7z)*o q-x ;hrz5ca fvkan $emf$ 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 conduct wisgb2yf oz4n.j 6m)9or will be that which tends to produce which of the following effec4izs gno)f w2m6b9 .jyts?

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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 rty1;9y1gqhxs tc2 w .horizontal table. A bar magnet is held above its center with its northxt1;r .2st 9 qy1wychg pole pointing 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 table. A bar magnet is held above its d5gzoor. 05rj center with its north polegd rro5z5 jo.0 pointing down, and released. As it approaches the 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 table top in a regiod-2ehr0 4 w5 bcolze5mn where the magnetic field vector points straight up. The magnetic field vanishes su 4r20m5o5hbe wc-dlzeddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top iz 5c m-iiaj:5wog2vp vc*n +b4n a region where the magnetic field vector points straight up. The magnetic field suddenl 5a*cgjn+ibom 5zv-pi4:wv2c y grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the mas+ks 5s;tx ikyy66y9+qg bw5tgnetic field points straight down. The magnetic field disappears suddenly. Whebs9xt5g;syk i 6k+ y56qy w+tsn 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-in2g bq k u7czj6jljgv*zk/e2vn,m)/( gcreasing current northward.vuc*bkvq) z 22jg zj6n ggkl/7(mej,/ Two coils of wire lie flat on the table, one on either side of the wire. 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 of wire with the north pole entering fir9:mfm+rhu hn -e- 9ntsst. As mhfmu9:srt 9-n+e -hn the north 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 constantdu c8r0a5b7e 2;zlhrm angular speed about an axis whose direction can be varirh;rmde2cb7a z ul805ed. In 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 zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an a;sec3+g)sb9z dn7dg qxis whose direction can be varied. In a region where a uniform magnetic field pog+eg 9dn7)qbzs3 ds;cints 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. imsvh 5i+5 jrpfv 2;m.w;da.j
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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 ths id;6y6l,njgsw:4 caat 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 f(3qqcgz) pz g6ield. 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 moved 1q2gd2 u0bbizce v48n northward at constant velocity through a magnetic field that points straight down. Make a statement concerninc8vugbdb1 qi220ne 4zg 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 constant angular vewi; d ;(g4ojwvlocity $\omega$ 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 t3 *.hwyah os 5guai-*lransforms

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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 pr u2xh 6-x6dpwz e-2t60 revolutions each second. The frequency of t 6pe22dt-x-rp6 whz xuhe $emf$ 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 use2wa87 amr1/n-a;o y(r alxxjzd 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 /6 +kfu ;)b(tnbqj2pj.u ratithat

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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 loouovp;cd3 0(zo fzou)+ ps than the primary coil then itouoo;+ p)z0v cf ud3(z 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 mogmxn(:5 iqrko7gf38 cre loops than the secondary coig7cox (i g5:rk3fnq m8l then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inp nh) -mr b2kem2 pqi3pzp.p1z)ut

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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 cirey9i nq3fp7w1d pc9tn5kw4 )ecuit,

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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 se iw2yj;qi9vv18lr n 8jn0tq7 fries to an ideal battery of constant terminal voltage. At the moment contact is madeiilrf9tqn;j0 2 8 871nvyjqwv 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 ideal battery of constf) rx sqdmt2fm4;,k(e7a(t nsant terminal voltage. At the moment contact is made with the battery, the voltkxt4 qe7 2)m;s tma ff,(dsr(nage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R i:xv1j0 kswod max5 rtt9q/if( tq335ws 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 R i4/mz xs 18iwlqg: w0vvwpnh z5j*z*kguxi,:) s 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 ;htu)kji or e/ dm.:m66s7xae5)ycc nseries to a battery. The time constant for the circuit represents the time reoh5 e) s6umt/ 6y:7r;cac)xd mk.ienjquired 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 tt+5y wahwd y)ao9cpr6h -,c*fo a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the 5f,9h odwwtya+h)c6p* ry c- acurrent 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 have2o (*nh n6do l8kmr,db 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 ;5astfeae iv;2:6ohx supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuitpid 8ktv177 p4/ngwv8hg wi2d, the currenp1/iti7vpw48d v7g gkw8dhn2 t

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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 cimt5 kue n7h-98km-xnvrcuit changes by what factor when the frequency is tripleh5 n-v9m8nx-kue mt7kd?

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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 is doubled, th 9q)nrt nz 8qv5pqbh)4a0w4re e inductive reactance of that iz w0enn))44 hp ar bt5rq8qv9qnductor

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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 indu8(91e w dwsb,h g3uwrxctor approaches zero, the inductive reactance of that cobwux3r1d,(8 we9h sgwil

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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 tzpd4 jhue*. opb uu,5;o an AC power supply. In this circuit, the curren jo 5*,h4.ppz ;udbuuet

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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 fact;p 5;qj +5yv t(+,7wqfhvnxpbnhy2dd or when the frequency is q5tnpj7h d nf v,x;wq+py 2bh(vy+5d ;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 acrov1 hor63r466 m lzil 6b2yxph *8aoticss a capacitor approaches zero, the capacitive reaz lphr2 13t6v4aycx6iho68rlo b m6*ictance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor in a kcqm- yout04u*ovq 8 :RLC serqmy kuvq t8o:c* 0-4ouies circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of uf(sf/; g3 f s;b*9nie1w dyxcan RLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increasese(mdy1 (hm3p yjo,esb*9f ug8 if R increases. When is thi mds(ygpef9oy,b1h 8j m* e3(us 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 im p7-u qox b41esk76gvopedance 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 *ubwsy*1-da h9y q0co 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 double in an LRC serilgc+/xz)r 0hip+snh;es circuit, the resonant frequz;xr )hnsl g/i0cp +h+ency 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 driuc gkm;;lfs s )w*j+*fven 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 RLCw5sze).sy8l1 d.h 9f.q j+7xdxvhvjl 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 rad1afme9 buzq0y/ys ra k/+x-8c9jt ;1rs mki0nius 0.10 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 field vector ar9y+rim 0rk1c;y-sf k xt0s/a1uz9b/me8 jnqa e 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 field of 0.,cv-bq, ,e2za7 jjcesc 9wk2n20 T. Find the magnetic flux through the loop when the plancj 927ze k,,s,wbj2q- cen acve of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is9l(.o u4hbi4 ue-cnx9(t zodt 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 field vector xd(bl to-(9.he4 4i9czntuu o 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 :l9+ (q gtasamloop 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 cjczj njw7k1 6rr*/g+boil changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a squam+ s+.h(9b 2dlzgo aohre frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T hm dgo+a+zb .l2 hs9o(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 and anrrs1+vt frc p7 ;sp1e*r*g2uv 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 aren(wvg:cnq;y eo.1vv nnp66 u+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 horizontally at a locati.lt-i4(+xjc h1 dwyq8 iqz;uk on where the downward component of y8j;.(x tlu- 1iqi4q+dkhzcw 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 b re:q-npq9*jde8.h-sy-r b qb ar that is 2.0 m long rotates at a constant angular velocity of 2.0 radysn- je: hde-rqrq-b*. 9 q8pb/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectiy),sqqt( -lvnonal 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 100p j29i7obf ;bq t4vypf:3ub j4 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 loop4atf k9zq6 ro-s 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 magneti-troza4k9 qf 6c 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 wire of arh:l cwwas55 05v/s ,x8rnpnahea $0.090 \; m^{2}$ 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 65rua ro;.g akAC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil isra ur.g;oa65k $100 \; cm^{2}$, 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 v,;w h j -jb0w,vs)5:idrfdjtgenerator 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 6.007hxt - 8kg9tcpdye r*1 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 mgl2v1 ff9ge , wd:+nl*dcem.gotor have a resistance of 6.00 W. The motor operates on 120 V AC, amclf fg:,lw d1g9 *ee2+ vd.gnnd when running at full 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 6.0 W is connect2)fnmkl cywtqp ve.9 /04rbb ;ed to a 24-V power supply. The opercqm yl) ;40k2 9tnfe.wb/vbprating 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 resistance 6.0bk+2lzrg v vjfy(s c*x9dys)k3p 1q21 W is connected to a 24-V power supply. The operat29qd)3z+y1s 2* 1gxjs kcf brk v(vlyping current 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.:sqr d9p(yj ((iitjdzgal 81 power supply. The operating c1qdpairyijd9 g 8s ((:zjlt .(urrent 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 pa9gahy+zgi(9e +i0-lf + ckytrimary 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 transformer causes 14 A to flow in the seca1-lb p5:x vql53yzok ondary. How many turn:avq3z okpl5xb- y15 ls 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 arevt :m32u s d/*yy*iwbo necessary in a 110-V primary if the 24-V secondary has2* uw tbvd:o3s* miyy/ 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 q smgtn85)z4 iiloy*.q x(3 jeof a 500-turn primary coil and a 2000-turn secondary coil. If the current in the seciq 3gtm si5e(ny*)o.q4x8zj londary 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 tran 6hb rhmkksb /h1(;pultv )t6)sformer. Assuming 100% efficiency, how many amps at 24 V can p1b/ (ht6vsh r6 km)but khl;)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 7500 V at 10.) k,k:)fkyi 7(ts8qrdcoocyic57 0h p0 mA. The primary coil operates ic:sc7iqo0,y)t5p) ckk 7(yro fdh 8 kon 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 ojm);5vb /ogfbm( kex6 n its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is p (5bo; f/ ebgmm)6jkvxresent 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 ha vv fo eu7 xogoz(;3)h5+a6cvhs 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied f7gh+xh(v 53aoo) vveuzc6 ;oto the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and mqdsm ;y(t8dw.3mj dsg4;5nb its secondary has 200 turns. If the input current at the prs;t.mmg s(d3d4 jbydw q; m58nimary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its second(-57wfm8g rzf eo fms-ary has 200 turns. If the input voltage to the primary is 100oe-wfgf mr8mzsf5-7 ( V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. (wlzb u7*pf y1 *luz6y f0pv4m If the power input to the primary is 100 W, w z4* yf(m bpf1lyp0u wl*7zv6ue can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is ush(ktpd kf:7w 2i4j d*aually stepped up to 4500 V by a transformer and transmitted through a power line( ajkwdi: *4 h2tkdf7p of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The vns1 bd2ch)f vb61dneu 9x7a 8coltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the perchb7n 92cf1 a6x usbe8d1nvc) dentage 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 curr/nd*wx2 eq6vpk *xbp;ent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power li2kxxp;* /ned6p q*bvw ne 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 lo(dh(c fjty7b3j 32mfjng has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformerf3d j2m7 j(b(3cthjyf 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 54w 7z+zvr lnt6avbyope/.16 h0 km long has a total resistance of 0.60 W. A generator produces 107eh wt/4zoznp 6b.1+v6 r yvla0 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 is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How ,/c lefy(d2qveswo8 9much less power would be lost if the power were transmitted at 3000 V inwo(d 8es/ cl vy92qef,stead 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 generatqs*deo.z e 2sh9+udvvsv6 98tor is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the powers*2s8t. 6vzqd+ 9evsvd ueh9o 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 carrie.(yn; ey a5.wecvie5 gs a current of 5.0 A. How much energy is stored in the coil's m .g5; y.5ywvecna(i eeagnetic 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 ejx;,jwpfpe 6; o+sw+ki r51o a 6.0-W resistor and an 18-H inductor. What is this c+;,wj;f6kiwor5jp e pes+ o1xircuit'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 the rms voltage is 1c )7.juzug.o f20 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 cu*c 5ygde/phmzmo k5 6 0ett)0t -xih*urrent?

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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 outl,(f idqfb7h7j et. What is the resistance of the lahd77 ffb jiq(,mp?

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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 connecteumdf-:-t:w /jjgyt0ji.to o;d to a 120-V ac power supply. What is the peak current through th-fidj;ot t j.m:0w: jygt- u/oe 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 thejm2xm jc ;nc,b8.0pyb power dissipated in the resis cyjm,b.8bxp2mnjc; 0tor?

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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 ocdos py6*8vb :hq5;y 50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50- ovtkhfqm va b8:ns0 5:8o*sp)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 50s.zmx5z ec 6 t3( ugvk1:e0hep-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-mH inductor ct zq g9 vcfz0cl,n6 m.w3-x1bat 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 coilfctmt)ju3c e;)s+13qe3 samj 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 inductdif7 k 7 h4vfufx990u fabz61oive 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 indu 36kjw7; 9ygmqjy st)by de:0nctive 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 whenn7u)gbhomjj dp6/i8/8 vro+ p 120 V AC at a frequency of 20 kHz is applg87 +m i8onvjbju)/p6 h/ pordied 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 coil due to a 1 s9 -j38ujfv/pr1tg.ngarc-)feydz /10-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 c5po )7ba0n.qzne 7: ebt :wqatzxw1f+ apacitor 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 r:0 +eacd )4bu cdxpn-geactance 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 reactakjj)1y1zov g1 :fzp s3nce of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactv e 98rfpa:0ulance of a 0.010-mF capacitor be 100 W upr :9levaf08?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitol6gta vn g 3 ex**hdm b uu-pct+kj5v-a;h.a,0r 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 circuicpgcn(m y5+zxt,57 m p3meq8 ht with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W c578cqz3m xgn,te+hm cy pm5(papacitive 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 coil, i *uewp)i(xx a:x 77zcand 1.0-mF capacitor ar(ac)*z i xx7:wip eu7xe connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20g kl vv749-tof,pix:w-mH coil, and 1.0-mF capacitor areol ,tviw 7x -pg:f4kv9 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 rie;uq;x :i9;yrs /o fconnected in series with a 20-mH inductor, what is the impedance at 1y9xr re;i;s: fiqou/; 000 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 serie +/ssgn 0adc1cs with a 20-mH inductor, what is the phase angle at 1000 Hz?a 1ccsnd/s 0g+

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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 circuiqhtonfp d93le k,lda)fj-7)* t with a 20-mH coil and 1.0-mF capacitor for a total impedael9*a-)f 7jk fo,3ql dd)t nhpnce of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W-zdgn gft47 b3.* jsmy resistor and 15-mH coil to 7jm4btg nz -f*s ydg.3get 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 ipwx3v(9n7z qon series with a 450-mH inductor at 5000 Hz for a total q3(pwo z 7nv9ximpedance 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 pu/: etnqv, )zzefew z),t in series with a 100-kW resistor at 1.0-MHz for a total impedance o )t:e/,)nzw eefv ,zqzf 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 sexvtyot5 -jx.wu a:3s 9ries with a 20-mF capacitor. What is the impedance at 1009 xtw y-o3at:u5s.jxv 0 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 foizk50y m x8k.n ,jbia-r a total iizx, mjk bk8a.5-0ny impedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHzz7syh-)j6(ksi90tba9 xv 8uu q n7b jj for a phase an 7bjb) nja-sz suuqjy9h 8x6(kv t70i9gle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz foyq56gw9,xlvd r a total impedance of 45 W?gvd9l 6xq5 ,yw

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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 pq ai, mcwxn+-slg+j(4hase ,ixmg(csaq-4w+ n+ lj 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 resise r: (frlu;gu0tor, 20-mH coil, and 1.0-mF capacitor f0r ugl ;uer:(are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W r5sqpc9k9el2lqo m)hmq :n, 7 aesistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power 59pmh:l ol7)cn msq2 q,eka9qsupply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and ano2zz ::d+o u3jegzbg2 inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circ+obuo2jzz3 gg: :2edzuit?

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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 (xklpo0u e;9 llgp9m7resistor, a 10-mF capacitor, and a 0.45-H inductor, when cl l ;9pu ge0mx(ol97pkonnected 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 500o *uhym(pl32g-W resistor for a phase angle of oyg*3umh( 2 lp$40^{\circ}$ 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,kg7) 59 zre7tmx)rx viir.c8o L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order tox7xv)m9)kter.i o78 zg5rcri have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15.0 p2rx(mo4 o4na W inductive reactan2o4no(4 pamrxce, and 10.0 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 an AC circuit . *v5kaoia txqz15tkv8 4 +oussf/vq6 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 resk* yqvibh8:z( istance of 30 W. What is the zv*8bq( i:yk hpower 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 a 50-W re qw5z yn5et*l(q 3;lresistor, a 10 tnq3 erl(5lq;5* yewz-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant freque 4e siwvm/wfo;ynlt4 ry40 p72ncy of a 1.0-mF capacitor and a 15-mH coil in series?w7m i44yos/ytn p4lre;v2wf0

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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 cap ,/dwmvd6j 95g,utqhoacitor for a resonant frequency hv/oud,w9q5jm tdg,6 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 a 3.7-mH inductor for a u1,jxqr jy436c.cvp.gq;ht y vdi(b; resonant frequency oh; q ybv.6ity.cd3;4rx,v qu jc1(jp gf 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 pla q) 1xn0ae0(pb:ccq:z.ttn-wk9 p vbaced in series with a 30-W resistor and a 40-mH coil if the resonant frequencz):n:0qka-9 av tqxpnpb0 c wct.1 be(y of the circuit is to be 1000 Hz?

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