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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux exce rp.8 1sjprx( w.hpr;xvof h99pt

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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 inducti r qlyx-25f:f/5stxnron states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of0t : vgmv-riiq:0tjc 45tls9n wire in a coil produces what kind of change on t:r9jimnt:c0t5 0g ils t-q vv4he induced $emf$, 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 produceu;ke4x ex//ig*tl7rw q( h(dms what ;ewke*u /gm( lxdq7/t4 xhir( kind 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 ofcc6+ i0rikvqt w7h-g5joskl00u7k )j wire produces what kind of change on the induced l0q kh0)iur7j+5 vwj-og cti70c6 kks$emf$, 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 masj krk4- hfi .dgdiy5n d03)8egnetic 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 la 8xck91v 9uyt2 v) ,,/u hqggzmvhe5dgqqh3 q7w, the direction of an induced current in a conductor will be that which tends to produce which of the following effects?xghgq) uyuv7 q1ghq /k,t2v8dqv9z, 5ec9 mh3

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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 hv;8:0fqay)vxxx o7og orizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary aqvoxvy ox: f)x0g; 87magnet 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 bhb nzo ts/46)is held above its center with its north pole pointosn )46h/tb bzing 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 tably v 4dwymm1q7sc;jimj :f3. n6/kbi *7kiem5he 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 cur mf i;vek 4.dnj/sw6:icq 73ybmk* h51im7yj mrent in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic fiel3*-gy34dk vec65jbpqddf * i06oc bvmd vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the dirvcq 34 g6j5ye3i -kb* bmd vp*0dofcd6ection 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 tablehh ra+ (e (4uuq27ijcnx3lkm) 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 this coil as the fie (qx4+r )u(heu72k l njmhci3ald 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 + zb0p90rkqe (hnli/zhorizontal table and carries an ever-increasing current northward. Two coils hbz9l0/0q+ z ker(nipof 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 nou aw4:hhlri97gg8 o5 hrth pole entering first. As the north pole :rw8 oha4ggil hh59u7 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 an q m cixroux2+59t1pz-gular speed about an axis whose direction can be varied. In a region where a unri tcu-21xmzq5p9x +o iform 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 anguzklc--- aeu(slar speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axic-uk a-l s(-ezs 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.b2 hkfhnq3zu2po4 1 updc3h, 0
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that a e6njh5:vmp 9k0t hf9hn $emf$ 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 magnet,q yk1t-f bkvfq/.o 2yic 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 dire ,a7ybbofk*85co b/ey ction) is moved northward at constant velocity through a magnetic field that points stcy* e85,ofkab7 boyb/ raight 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 constant angular velociur*zu:cfqa;6 hoo)9 n ty $\omega$ 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 transform ++z0xpwxiu.5- ox p8c gb3s0vq9vurqs

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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 s evc;xgu7 ene8o61 ,tuecond. The frequency of the;17uen tgu8,e 6oc xve $emf$ 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 us24bst2mr6rq4 2 y+cjlgy +v8k1dicueed 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 dev03 1feeu+ jyhsice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil c8bt7i 3etry n.ontains more loops than the primary coil thenb7t8riyn 3te . 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 coif;)*h3rxq;/rc5 ra kv:gxdrcps owm x* xl;6 ,l contains more loops than the secondary coil thenca*lfvr;r: xw/xr )5xm6 ,od xkqhcr;;s 3gp* 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 pe3u vk;(ikq 7wdnz*8mower 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 resonanftap+59p8 gd 2i( ymigr* cb8gt circuit,

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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 tonu4(letq qjx7;;h ( v6-0ts ( imsqgqg an ideal battery of constant terminal voltage. At nxt ;is -qtjge7uqq(sv0l (qh;6(g 4mthe 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 idealm3rkm h*z r rv n8g+mr4(8bdv rw)kg;4 battery of constant terminal voltage. At the moment contact brgh )vkkrmg34rzdr *; v8mrm4( 8n+ wis 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 wit g2lgid -df;-ph 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 rp cwcd-c d.f+xa)w/1 k0k r.l (nnkue/esistance 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 battery. T2* g /p hau3m:4t- t9nr4vkk,pdyjpdghe time constant for the circuit represents the time required for the curreny:k*mg th tn 3ppdj4/2 ,u4gv pr9dka-t to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The ba 2lfm0rh4j5 yqttery is suddenly removed from the circuit. The time constant for of the circuit represents the time require m5yqfhr 024ljd 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 k/fdaly1sx.n3 w1 n2 fexcept:

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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 circ.0:lbpu xse7 uzcx :y-uit, 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 coyvx c.k. k(tc hc4gc)qc+)ez(nnected to an AC power supply. In this circuit, the current )qy( cgh.tevcc4cz)cxk .(+k

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by kt4pld7 ykk /f643nld what factor when the frequency is t7t4 l/ld6d nypkf43kk ripled?

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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 yz n1qv*4)fhq AC voltage across an inductor is doubled, the inductive reactance of that indfhqv)y14*n qz uctor

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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,4pkqz my/5pb,y c4pg2x b:3 oj the inductive 43moy2yc4zp bk ,/g5 bpxq:jp reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circocc: lf60zzq +uit, the curren : 0floccqz6z+t

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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 f6+pyi hc ilc01a31wl0 rm-l wjzej(r)requency isi l(y -6apr ec1w30+l1j0ilcmwj hr )z 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 capo3hdx pex4-dqma*+,v1)edfu acitor approaches zero, the capacitive reactance o+x 3m,ed4xev)*h dduo-q1fa p f 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 theiis sr9 m:pe329iozb( inductor and capacitor in a m9s ribeo: ii2zp(9 s3RLC series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC -l:( m:i g8qjaryxz*2kikxx0 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 9m8l17lk*yo rsb/tl s n 5niy6impedance of the circuit increases if R increases. When is this statem 6l 95oyk1yrm/7*nibl sls n8tent 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 increases i;g yjky; hn g*dt+;,lgf $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit gd6 li;.sha*s-/d)sy0xx q z kincreases 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 inm65t )8 7c asuxvzim*r an LRC series circuit, the resonant frequency of that circu 5 i m)sx8m*7rzvcatu6it 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 driven2k v0v cku2w(n 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 db2qmrdx0 5 5ewhen

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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 rota.l43 qcx9f8ks 2n1yz wpmovgj 6(tkj1ting 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 are parmng6xq.83vcyl 9 w4jk(2zsf ot1pj1 kallel.

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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 *pxhtg ek;x +qnqkvl pp7 (*;5magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vec xp7lvt5p ;+egxp(hqk *q*k;ntor 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 is rotating in a uniform magn/ +szof8053 yovecbje h;sa 3ietic field of 0.20 T. Fio 35;fe/8bysj 3a+ hciezvs0 ond the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable singley6(:r vcf tfu-)id-be 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 from 5dna0+e n mbut,8rin:xgw8:z $4.0 \times 10^{-5} \; Wb$ 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) ,gjyojj:bv* sides 18 cm. A uniform magnetic field i *:jj)vyg o,bjs 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 tur ,xz.l vui h8w.h6p/lrns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns annln i.r fk,fkc -bs*/,d area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a locatiosq,9l mg1j o*in where the m*9jg1isq ol,downward component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 b awc7n*4g1w qm long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant1b 7qgac4wn*w 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 crossg;g anq2y8- 1s o+ rbwz)bduw4-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of a4t.bmhm3( lr zao2i n4rea $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armatur) i,my 4k8o3qi1q vc2liw: j5uoleuq ,e. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to 5ou y28,c4)elqu1ki3 i,qmwi qlv:oj the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 15rah bzf + ,o( n8 )faev,vgiqeb;8z-t00 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 sim*9c ob6dhdly az(00w wple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the zlh(0wc *w a9d60od byarea 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 a maximum wu 2nat -1 6x3jpjsoqjviw60jq;+eq:$emf$ 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 2.ttp;*ojcnb 5*9g/m mqd ysfa resistance 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 resistance of 6.00 W.mv7pd xtnscn6vmc2-n)/5m8 e The motor operates on 120 V AC, and when running at full speed it generates anncxc7em sv5/mn-p26d mt )8v 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 connected to a 24-V power supply. T2ykgk/vz;a,0 /bfja8 yw 1bklhe operating current is 1.0 A. Wha/y k2;aakjvz8y/g bfk w1 0l,bt 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 suypep*-9hmg g -rpf v er,/d2p(pply. The opefvd* r y-p/9m,e g(re2p-p pghrating 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 7 5xrq1,jijjdx6i nyizq 9z9.is connected to a 24-V power supply. The operating q 719,xijzidjxy .i5z 96nqrjcurrent 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 nrb tn5xdd9/wpu+ 8wvvtr5)+ needed to reduce 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 transformer causy -caz+zvq8z5k/ep z: es 14 A to flow in the secondary. How many turns c+/ :zp5y-8kzvez z aqare 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 vo :.fc.ve85y/4jj u3fbpy b oin a 110-V primary if the 24-V sec/ev.3f.yo5 focyb 4 bv u8j:pjondary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 5 xls i4n9y.carkx7s; 000-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the curren7 clx y9xs0ksn 4.a;rit 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 th n.se8 gzgc2ptnz4btyby8t1z /; bv12,*ds ha e primary of a transformer. Assuming 100% efficiency, how many tz/tg,;b 8dhyntz1b*a1cyep 2 n2bzgv4.ss 8amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer pryijj( fr:s 42p.w wz;rovides 7500 V at 10.0 mA. The primary ;f:i.y4 r(jrw2zwjspcoil 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 primary coil and6p8mgh/aki2l3 : ecgmk5nc (z 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what5cg nekcki:ah/m3 6(g2pm8 lz voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300sd 4u0e5w1 -5k 9dusckkkvwv/ turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is presvsd55uw ksv/9uke 4ck0- dw1k ent 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 turn-xy- mop4 k*qb.c1qr .jjt4hhs and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the o..41rj4bp hj-h xq-tqkmy*oc 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 has 100 turns and its msaqh+frx q s-/ qasx /4+/zjleg0 76lsecondary has 200 turns. If the input voltage to the primaryqasax-j s6/x /+q4s+fl7q z0 hm/lreg is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 t(r.9cu6bx naxv5f 1y surns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictifn69sbyx1vrx.ac 5 u( onal losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepped /bhe-rs )2 5;sjynzg nh1tpu6up to 4500 V by 1zt hj s6;5g2- usrpn beh/ny)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 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 is2 bwl (es (yqquwdac 1e50.x6k usually stepped up to 4500 V by a transformer and cu2qlw wq ebae0yx( s51. k6d(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 currm;6 kzx,9mec rent 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 ifm ek6,c;m rzx9 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 0.6a8okx 1/tdu- zkym/a(0 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 origin yaa 1om/u t-/kxdkz(8al 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 0.60 W. A gqt5 v(r0ql3h i9l7 ecqenerator producese v70hc (lr9t3lqq5qi 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 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 linec95/mfcvkii: k dq0o, at 1000 V. How much less power would be lost if the c,vdq/moki50fi 9k :cpower were 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. mp60k j j6p4jsIt is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be steppp6 j06ksmjj4 ped 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)esf w6)+9mvsk 8 amqx stored in the coil'smm9x6wk)+asv )se f8q magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. What i7+nstsd8o1l ,o3 paqas this circuitas ts no1o7l8+3,p qda'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 cirbez( ce(cw/ ,(h2mpoh cuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC ou9quq - hz+xvu uv:o1:5 m;)miey3ii(6wsctrztlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the reslfq:w rd 8w zie/((h ary9r*l- 1q3ljqistance of the lam l il9qhrlrj(er/a81 - *ydq3z:wqwf(p?

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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 //wdksi 7lgh;9co * :cgkt9yoa 120-V ac power supply. What is the peak current/tkg c9o; 7oksgd y:/*lwci h9 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 supy1z9xb(pbpu85d f 0 gqply. What is the power dissipated in t (ppxb5b8 0u9d fz1gqyhe 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 xmj u uc9jinjas-h56c9 (()zp,w4 j bua 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 e llxrzu-nqf;y5 p 3dt1co21hlt zt5:n.j/ 0v 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 q f-ckg0d2u2pa 50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor +pn +rlpfj 8h-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 coil at 1j3r7ujit29w n; .8 tx71jwoe per2bav000 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 oy; lu7jl bn-j;f inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 l;rs tnc:+w5k 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 at a f,e8 bo uu3eoqqaigw-(- - )4l .nfdv29rkmicnrequency of 20 kHz is e rqu w9ielmo(q-dvkang-cbnfu28 ,i-o34 ). applied 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 110 stsf /3td8gd2-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 rpj,kd iv vk: b8 ,uq8rt.n;zgz( 4elf+eactance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitivx,ogy.ksl*z+;m 0xqz e 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 jzz/q22j u1qd a 10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be 100h rr ,lh41izf1 W?h i f4hr,11lrz

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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 capacij:n xp1a 9y 7.eydxt9otor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W ref.k v.; 3rbvtcsistance, 15.0 W inductive reactance, and 10.0 W cap3b tc.kv;f .rvacitive 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 coi:vfeb g71aboeaxb:jl( .:r9 bao* s 4il, and 1.0-mF capacitor are connectedvjabs9e:xr( 7lbg 4 *: boi1:obaf e.a in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0s-+ y:an j/mlpd6zo d)-mF capacitor are connected in sepsdy-laz:nm6+ d)j/o ries?

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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 connecgos)t r:j+ai/)i zkw1/leht2 ted in series with a 20-mH inductor, what is the imped2t/izlk/hrt w e1 s)+:ai) ojgance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20--s skzdv 7dq/an(j93jmH inductor, what is the phase ( ddza97 s/3s-jjnqkvangle 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 series circuit with a 20-mH coil and 1.0-m i*re,llvg7 .aj.s(ldF capacitor for a total impedance of 100 W at7je*r v(.,l llsadi g. 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 followi;zz*qswycg0j z h s/j il7(x48o vx2.nng capacitances is needed in series with a 100-W resistor and 15-mH i/v8c (zssj*7z20nxwozql;h4 yg .jxcoil to 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 5000 Hz fop 0;lp+o xbiy-:d ;wpfr a total imp w-+fipdo;;pbp0xy l:edance 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 resi;9luwq:bc htk 0 3kgc;stor at 1.0-MHz for a totatqbg : l9h;uk30; kwccl impedance 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-mF capacitor. What 68j; 6( ip3y+ lmeeqdwoz0mdbis the impedance at 1000 Hz?y jowzbm;+0l d(i8pdem 3qe6 6

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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 9 1*fi:qb5v0u a7wuazugw d,y kHz for a total g zw 7 0ub9ufiad1:*5vyauq,wimpedance 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 bxq , ou:1sqqzeov/0a2 )cq+ lkHz for a phase anvl2: q,+bz0aoq q)u/1 xose cqgle 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 e,fthq/zue45 de - /qdseries with a 30-W resistor at 1.0 kHz for a total impedance ou4 /,z/dqee5 etdfhq- f 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What fewi(e8ai7/fiso(7os 1 z ug, is the phase/gewsiaifz fo(,iu771 o8 s (e angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 2 a5npz7l8- s5vz ihdv58w/utl0-mH coil, and 1.0-mF capacitor are connected in seri tvav ldp-z z7u/85 85hslwin5es?

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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 rdv kge;4vka); gv :vo+g i6wk.esistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuigd;)e: ;gv 6wvvk .a4k+iok vgt 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 capacitiv0 lq 8qjomq/kx) gn*qji9o84a e reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. Wha8q)ol4x nqj *gi qj9mq/0ko8at 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,x, obks;wb ode/.e(w. a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-kwsx.e /. boeb(od, w;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 l lzxulaa7: addqg: (r96q,v0a 500-W resistor for a phase angle ou0l la9: ,rqz:q dax7l6d v(gaf $40^{\circ}$ 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 = 200r9e67 r6cgqvb-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferredgv6 9reb7rc 6q 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 14rl+erjmh dcx (;jo8 42.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connecter4l4 x(cjerj; omh d8+d 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 isj/f ,z- etf-mhk/;qg5 xhif/i $63^{\circ}$. 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 ico t/,mcl-m4 fmpedance of 60 W and a resistance of 30 W. What is the power factc4fc ,ml omt/-or?

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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 containingo2ze i j j gt7;vce52pc0)v9lj a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a5jl9)22iecg p j0vj c7vtzoe; 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor1dwrj+ao d (h7 and a 15-mH coil in series?o(r7dhdw a 1j+

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is naly (g k4* l/zy5nocv+eeded in series with a 4.7-mF capacitor for a resonant freque*+ylgklzc( v/45 onya ncy 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 inductori+:lo3j1.z 2rt h arpmtx b)k* for a resonant frequency of 1000 r:rhtzo2t*mlx1)b+.a ip j k3 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 cs))-kp7o iiwp4 frl 4soil if the resonant frequency of the circuit i7w4fi)- pss4pri lk) os to be 1000 Hz?

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