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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://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://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 r . ii wnzv-4lqfhb2k: k+iw5(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 thad+pv--5l1) 8:n sojzaqzx fqst 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 off0(hda 9ws4 c:j:qu aa wire in a coil produces what kind of change on the indaf hj0a4q:d c(su:aw 9uced $emf$, 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 wiwvwd:6s k 3pg2re produces what kind of chandk 62 gwps:w3vge 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 zkdu3eg4 ke y34zb 7m bpc3 kl;e,:d0kwire produces what kind of change on the inducec0 g37d4dk4bk3z,be3 zuylkemk:e ;p d $emf$, 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 fieh1bb)3lg vq3 gld 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 curro oohetw5w o(t p u/x aa1uq.(2s+33uqent in a conductor will be that which tends to produce which of the following 21 t/sxuop3(w ho qoqau5aw tue+.(o3 effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is heldkmbu8s. qq 8gk;vkq3* .a7yac;1u9xpy 3tlrs above its center with iskqt c;;q8ymk 1u ls8auyrq9abpgv ..3*k73 xts north 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 b +(8 bpr(*otu4/bn,dgn cxyxu ar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling matou8+c p4drbgbnxn u ,y *(/x(gnet 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 tab9mu ,wp6 okaew p6qw 5h5w2ji*le top in a region where the magnetic field vector points straight up. The magnetic field vanishes sudden 95 5*m hupjp6kowi6ww,2qawely. 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 in a region where the magnee.5ckb6, qvlatic field vector points strq 65ea .kbvlc,aight 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 horizontal tagkv/).3u wnft ble top in a region where the magnetic field points straight down. The magnetic field disappet)f .vgnw3ku /ars suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasing ckjt.y8gwlli+1 xz) q,bu7 k/znx)+ hj urrent northward. Two coils of wire lie flat on the table, one on either side of the wir)j+z b8,wl+/kuq. ty)in zgjk xh1x7 le. 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 ckmobsfn*h didro.aqh1+cx*- j/ 5mkc; 1x:0 first. As the north pole enters thhdx+m-fkccoqbr.jdo1c1m; * /s0 anx5i * hk:e wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whose,k3m3xgx tw+2kzw )lo direction can be varied. In a region where a uniform magnewx3m k2)3,zwog+xtl k tic 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 cons+w). k)lq.a st8yavi4wsd w7s tant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points str+ .wksi) awqy)s ts8vd .w4al7aight 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.,h4e x :d 8dl*+qyhebfk.1hjy
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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 t2z4opttn rr6a3-*vu3 xgd ml0 hat 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 urr6e(:p nsa yeq isgz4 zrlbw*8365+a magnetic 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 (ori1b0t / dfpy pq1 h u56wr8vx:9tlkh5fzented in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. yb5f8h9z/fk p xhpvq1 56rdtt0l:1 uwMake 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 anguladgg )rkw9f.;f1oy(p6 yrtbm(q v+ y*g r 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 try;guo)x uf0y41) *sui rw ju3kansforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotate 8pkx3( ors;p tele p;6plk)0ms through 60 revolutions each second. The frequency of t(8plx6ekl3 s k;eo rtp;0mp) phe $emf$ 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 v4d1jq:yn wf 3used 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 d o3p/f;fjh*bq evice 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 th gh;tvo 84j1tt u7qg3he secondary coil contains more loops than the primary coil then it is a3j qtthugh8v 4;7o1tg

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than5jko3c 7 sjdvm tqc:-. the secondary coil then it isjj7- o5vdm3:c.k tcqs 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 in wm:7;uhb :6+nsks txqnnpv .sw.4; vdput

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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 circyh /1b2o 4-fp9zb8qc0k gy yqhuit,

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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,l wjlghe 1rg7538h jp series to an ideal battery of constant terminal voltage. At the moment contacjjreg h5,3 7hp1wlg8lt 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 ideal battery of coz*-e0 g g,dlu kccgj40nstant terminal voltage. At the moment contact is made with the battery, the voltage across te u0jg g-l4d,zcgck*0he 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 is connehk0 7v.oz -geected 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 rez)n wwcqw3m 4crfh417 sistance 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 i fj/h.ky pl5fq6657bzc 5tn q+b5ucop n series to a battery. The time constant for the circuit r5y bnf u+5cpo6p 7zc qh 6qt5bfkjl./5epresents 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 seri;(s,vxs)scm,i.bl rwd*kchn /* oe5ves to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the cur.c,o5v(cse*i h) rdnks* lwmb;,s/xv rent 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 unig4zff+knb6yr 8 ej1 -xts except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the currws+t 6p..fdg lent

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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 pow.ewnv fea0t0d -7*i+ op 3nvhoer supply. In this circuit, the current*ho df 0e.in-w7et v +oa03vpn

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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 what factor when the frequ0unj .oal) soz00qu:l ency is l:. )z aj0uuo0q so0lntripled?

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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, the in)rca7f sk:4twc vpjl07wh0 b9ductive reactance of that inc9r ):t kc7sj 0 hbwl7apv4wf0ductor

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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 v5/ivaaq /a-q*lbtp: poltage across an inductor approaches zero, the inducti5 /*vt lqip paaqb-/a:ve 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 circui v(yuo9/v2p1j3 l.yjblp 9nfc t, the currentlv19 jv u/p . (n29jolyfyb3pc

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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 +e( /0n.qsnmgwmw k5yqe.7zaz qu;u3 circuit changes by what factor when the frequency is tri 5weaz.s0w q mnym;n/(+ueg7zq.u3kqpled?

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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 llo 0-v ud-4oaacross a capacitor approaches zero, the capacitive reactance of thdul -v0-la oo4at 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 m ta3uun t imfr/.,n/(in a RLC serie/3 tf/ir.na ut( mnu,ms 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 g uy7 uj pf.d1ba)y-v9an 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 circuiz92wf.ag y8, cm04 ez+xk 0iogt)lbert increases if R increases. When is thisltm0yec zk9 )ao fg0g,2z w.xri b+48e 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 oxu774ubb ip( circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit incw1z9dgre/ 0 hhreases 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 capacodu/ myz)kccde* * 8i3itance both double in an LRC series circuit, the resonant frequen) dk uiecmdzy*8/3o* ccy of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC r9:t.t s,ggnr 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 o 0kfw 8rpd; vce.x2cz9ccurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnek /omg7 /exh6jtic field of 0.20 T. Find the maghgm6kje7/x / onetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotj +5lw* wkt6)x 0ggjhuating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop wheg5 jjh)0*u xt g+w6wkln the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform maj0b7;7/r ct v)maeklpf z /xi-w hf8*rgnetic field of 0.20 T. Find the magnetic flux pefcw-*ki/j7)a/z8;0rfb mlx 7v htr through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced fbpq/; zu1i4dfrom $1.0 \; m^{2}$ 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 chqsd:jo4,x he4 anges 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 s3tn eh7g , qoigv w0i149fn /4dshtbus187pwwquare 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 f4vhwt09ong d u71h i tw8bewg/,4 is1q3nps7to 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 turnh0.d 59ls.qdwc :jntis and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and 3mjq7uk-u (fr k/sc4 carea $0.20 \; m^{2}$ 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 a/re1 cf7vxx -at a location where the downward component of the Eartxr7/cev 1af-x h'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 2.0oda79vn ewoe0;0e.h m m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a conste vmno 9. e0h70aeow;dant 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-sect v*(qqdc n;by(0d7bjdional 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 oktsq:wgc c+ ez99v c7: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 rectangulark3 irpeqk,(jp m 851xc loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis paral kk,mq1x 5i3(c8prpjelel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of awzq - )*lpkx.0oe4dd 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 co()o ibe9m80o txjq0cmnstruct a simple 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 area of the rotating coiljmibx o0c)eo0(89 mqt 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 maximbf y;nazg(*dx-g iy)8dal :8r,cn7 pmum $emf$ 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 wz -(n 2)5 uenm ,dubf+x tlw8hyo2z+r(z s4zuresistance 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 resis*avjqxh551( ji 1rrgs tance of 6.00 W. The motor operates on 120r5aj(qx*h j1 1igvsr 5 V AC, and 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 connectep f:;qr2dv0syxrg.hxw+ v*cc5w 9m (yd to a 24-V power supply. The operating current is 1:;5rdcxv w 9(y hrsm.g2 ycw*0pv fq+x.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. /tqqn+s- t8)k-p dtly The /n-ks ty8) qt+dl q-ptoperating 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 mye)d/na+yx34e mx4 w;co9v r to a 24-V power supply. Thm ;3)yye4/ rdwmx cx+n9o v4eae operating 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 ne33wtrh, rrk1a eded 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 primaryaztzm j8m 3k53inms- . of a transformer causes 14 A to flow in the secondary. How many turns ar.a5zns3j8 -mmi mzt3ke in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primarvrh3 tv5 d-jc;y if the 24-V secondary hacd- j5;3v thvrs 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 2wxgk+/:r,g glcgnmgf *b259s*8fk,hwk cp 0g 000-turn secondary coil. If the currengm25/+c:f,g,9xb w8k0w lks*gpfg g hckngr*t in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% (8hcmcl w(uz*20yckr efficiency, how many amps at 24 V 2y mchrlkw(c(* zu08c 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 signh1 ds ,w;f; z7aaeacs1hmh(jkug 5g*) transformer provides 7500 V at 10.0 mA. The pr7a fhzahk ge;(u*cms5 jsagdhw)11 ,; imary coil 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 flbj 4uy66*elsfy r*, primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present infy,e6l6j* byul4* rsf the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its sgy78yon-hul+ s/gyn/ econdary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the seo/u sg y/g+ hn8yy7-nlcondary?

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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 2001ht6mlbwaq v*5;vy) v turns. If the input current at the primary is 100 A, we can expect the output current at * th)bm 6wqyl5va ;v1vthe 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 transform0,6ng0 lsz7yccntl y3 ;emml8er has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect ezg3yn 6 ml0l7t ycc m,n8;s0lthe 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 ttjoa)lr q5w+/uhcc5i88 *grn m. 5ripurns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting furrto/ wi5camr5 *lq+8.gjp 8c n) 5hirictional 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 1207o-l(g8 i;:ugebzr7k w sek s/ V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a powe(: ;kire/egz8skbo 7w-s7g l ur 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 voltag7yftpl s q /-jwa9j*idt.d05be 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 ina ytd7*qi 590sjb/jl- d.wftp the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usuall(r7ww/m5lch . x7lqs ly 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 thmwlsr hwl57(l7x .q /ce voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A generi knq2s5zq nt;-1 coy/ator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission ln /z51qyto2i nqkc s-;ine, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission b(efk , ;xqg e(d25b/io*v8s jx jt-trline 50 km long 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 is lost when g xqf 2bxeo8i*5, b;kdej(s /v j-(ttrthe 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 w2 ta82fmn( s +312cihuotobq at 1000 V. How much less power would be lost if the power were transmittewt+t3qo 2nou2i fsch28 a m(1bd 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 20m*7 f;gd2sw3wqv zlrj;.i6n p 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 power loss in transmission is not to exceed 0.010% of the oripi2;qsl n6d wv .7f*mw;jg3zr ginal 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. y(/ 1 lj6qsqpxm oek/10l dk9oHow much energy is stored in the coil's magnetic fieldqj k dyx1e90o6s //(pl1olkqm?

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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 resiste.xa;iq p6h ,i ppq-v2or and an 18-H inductor. What is this circuit's ti p;. qxpav2eihpq6- ,ime 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)8qyb*yxe3-5sp 2rtg ws3 jiq AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the s(it1a v +ix)tl3w eytm 92qa+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 1., xun8xx vva)20-V AC outlet. What is the resistance of the lampxu vx.va8)x ,n?

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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 powerk (f851f(bl.fpq8yn(ao2zz+m*i mn8t u kcr g supply. What is the peak current throulqkc8zg rk *mp.a fzubtf2mn8 8 1f(5oy +(ni(gh 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 4gjo7y; pmz /:-mwi9j* taky wac power supply. What is the power dissipated in the re9wm7j/i4*ytm z a yow;p- :kjgsistor?

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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-k2r 9h;onhbk t6kj(1tW 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-W xzuc-j ipui) +d7 1(fzresistor 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 bl nt()ait 3vs5ia75j 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 az4+jskeb dk j34a21sx 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil atzm 2lq5::7;vgqd;m vrb x5grq 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 x pt58mb .1cnm14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductytyhdrj r3mo2y1+2h se(29bu 1y3u f g :c5narive 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(p8ia7w ke3z y a frequency of 20 kHz is app78yk( ipe3wz alied 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-V, 60.0 Hz /uusb3sfa2f wk q1j*-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 at 102r7h x,cfssz dc01w. q3c)dv o 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 i bq.9mwvbpcz1z k9hhg 8g 6,7qs needed 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 -d1*frozz x z-b17 hapa 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 be2cl db20e40vkyhj 9 fgx4 q-kk 100 W? 204xdqlgf0v4e9-kk kbycj2h

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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 capacitor at 1000 Hz 7eh /k; 7-wrt,ukgeho. yn-mp wua41dand 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 resistance, f)z j(fz48 ,ip:w ky3ohizx,+ tkpi4s15.0 W inductive reactance, and 10iijkyso4)(ihzk,w f,+p8t zfp:3z4 x.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil,uq*v0pjkx ifvls-vsu :( (d8z.(zfp/ and 1.0-mF capacitor are connected invdf(*i .v8zq /plp( fzsv(kuu-:xj0s 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, an qyd44 ,t47g:zjum 2c th+jjkwd 1.0-mF capacitd+jtk2 :qcjt 4mzy h jg47u,w4or are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected l5 8op,g6gbf min series with a 20-mH inductor, what is the impedab,8gm5ogfl 6p nce 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-mH inductor, what isvw uobp2eh))ee0nl,u.4 k b / 7neu5px;;gk hz the phase a wnl)z euphe o; bvxn ee52,u7).4p;g/bhuk0kngle 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. jti :()uoonw-mH coil and 1.0-mF capacitor for a total impedance u:.jow oti)n( 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 resisto w;h8o5-t(/)2w qkza zec-d7koce gqm r and 15-mH coil /-c5owdmwkqz o7-e;)agkc2tz8qh( eto 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 ind:)if-zin3 j o series with a 450-mH inductor at 5000 Hz for a total impo-z:3jni d )ifedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for a t+ x,vjavt89 4 zamei,aotal impedxa4ja zm,a i t8v+ve9,ance 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 connectukf jk (*5aza, hab h.wy*8i9ged in series with a 20-mF capacitor. What is the impedance at 1000 hi( .u a*f*9 ab5ah,ykzgwjk8Hz?

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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 cr3s2-u5gdjscapacitor at 1.0 kHz for a total impedj25cudr sg3-s ance 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 kHz for a omv vqxda*:;rb 8 :(*j:ay lyztc*l:lphase r;: zb:cdt*(*vxlm: : qaavoj* yl8ylangle 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 withrw /l*;(swr8)tc7sdv;d/u w qxpc0 pv a 30-W resistor at 1.0 kHz for a total )t duwv 0 pwpsd/xvr/lswc; 87cr(*q ;impedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz.zgktn6vew*3m a4a 2b: What is the phase angk4: t*menz6ba2v g3wa le?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH c4 fd3 8i,ygkr qoq9z)ioil, and 1.0-mF capacitor are connz4kiqq y9o,fgd38 )irected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, af 1gln py(5t+k 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circ n5y f+k1(glptuit?

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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 cap52i 57lfad7pjb8zzz4p hi ve-acitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. Whale7ai8d2i z- hz z4p5bf7pj5vt 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 res8o q2nw;(lflw istor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power q2 l(;ww lnfo8supply?

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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 phas rdj h9*,)jv,ifx f es5/,ybywe angle of hyjwf */j9,)evsfr ,xbidy 5,$40^{\circ}$ 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 = 20doroljw6w7f 24f(9 gl o-i/ku.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maxiol7uli d( owf/4gf 69kr o2w-jmum 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 se1dnhka4.kzx8np .9* f k7 duqpries circuit with 12.0 W resistance, 15.0 W indu4 fpn89.q uz .xpdnkkh1*a7dkctive reactance, 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 is okxu e/ in7p+b vv 7uzik+)t04im)d,q $63^{\circ}$. 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 hmck8nlvbc )w47,lhm vhq36 lg ,alqv h9:tt+/as an impedance of 60 W and a resistance of 30 W. What is twhl +l a,/6ct7k9b8 4,gt m3 vh:mlnq lhv)cvqhe power 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-:4g rpqq5do6anzpx +k2 bs,n 50-W resistor, a 10-mF capacitor, and a 0.45-H i-n:q,pz akpn4 6 d5x+o2rgbsqnductor, 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-mF capacitor and a 15-mH coil in serip/8 f re:xi*bm6+.1a ciw sd g cjw*b):wju+ynes?cfp 1:b+)xrg iw/ei6m*c: dnabuw+j 8y.w*sj

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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.h2ewq4mo,v9 t7-mF capacitor for a resonant frequency qevth94w o, 2mof 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant f2h/mnl7sn 7 wurequency of2n lsn7wum/h7 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 a) u/- wpx2yldqpax53be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 15/q- lpx apaxw)ydu23000 Hz?

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