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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 80 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。本试卷的直接作答链接 https://51fly.win/test80.html
 作者: physics    总分: 142分  得分: _____________

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux excepzih)b ,( ulxd li*k87zt

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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 inductiondh369; v wdlg f-du0jy 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 of wire in a coil produces+rlyzq k+q: 3 saexp(6 what kind of change on the inducep6:x aq3krqlz+y(se+ d $emf$, 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 a5 iyft7 .l( pzign: -xvxq8wq. loop of wire produces what kind of c . p.ix(f7n i:q 5gv8t-qyzlwxhange on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on thev p4p8 6e9r:5jis ryyz induced v4zyyi89 5s :r6ejrpp $emf$, 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 do0bavwcv::p96wyf(1 y c o 0uan $emf$ 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 ofkhipu ,8ekm1/91 pi. h.yx mlc ,rvns. an induced current in a conductor will be that wu p,1 i .1p8.slex,hcmirvm/ky9h. knhich tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat2 y*hsj;pv /ps1br w)l on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewl;p)v 1rb*s hys2jwp/ ed 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 5fn pv4dc05mo 3yuw s9rss3o+above its center with its north pole pointing down,mv ws ydsup49f+50n 5co 3sro3 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 region where the magneti.)g s*yxhta)k+e 8muuc field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the 8) gyumkhe)asux*.t +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 kkb/6di ja( ss 3 :tzemh6z9f0table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this a mb69(zkhzif t0js/ edsk6:3coil 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 tu 4wys*46bsw b-/yq yhhe magnetic field points straight down. The magnetic field disappewu 6/4y yby4wbsqs* h-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 c2 o0:nb*xl f9,udgoc table and carries an ever-increasing current northward. Tw2o,9culc* f d0b oxn:go 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 w):izgtb s9 ysf)g(/,a0tvg npith the north pole entering first. As the north pole enters the wire, the induced 0 )s:nv9b(a,if/p)tzstygg g 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 wiid)i.gtakrdlsw ,q 0 c/ 42 mgrw9y5+fre is rotated at constant angular speed about an axis whose direction can be varied. In a region where awf 0mrc2.d+9 5) agws,4gir tyldik/q 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 const;jl6m0rf45n/am yvsl gf h,;b ant angular speed about an axis whose direction can be varrl ah5ym6;f;f bg n 4mvjsl,0/ied. 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 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.6d t)awt(:1k-xipcf n
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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 an ea65wkhsa ;g; $emf$ 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 a6 nd gd(5miiyr2q 3o8d 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 (oriented ifpl hngdzb fq)0e- 2)nuv 6mv +lm-u0(n the east-west direction) is moved northward at constant velocity through a magnetic field u0qlhe zm6 -mf0(p-bv vu) dn+nfgl2)that points straight 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 velocit+uyeo8m tinvxa) .q)2 8,gduby $\omega$ 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 transformsd1) a 6csf(oc -vs9k6.gsfcuq

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotatl,3,tfik1mfagu-z 39 2crdqf es through 60 revolutions each second. The frequency of the f1u29iqrc l df,33mtk fgz, -a$emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used to(y)zh fqkrwa u-y7a3znp c47,

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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 devic;2dkt)1hky e pe 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 contains mor iyvp/xck met: 01(x2eupa/l1on,6kk ao0;nv e loops than the primary coil then it is aokvn0m,;/iy ak t:(p20 xxpn 1oce6kleuav 1/

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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 thanl+f2vnk*l+hz the secondary coil kz+*fh+l 2 nvlthen 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 pobw, k7bz8flec cy,fx -6 jv6tly e9i/pi* :ao*wer input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant dn-mzq2/ ut. dcircuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal batty b3.5b:a1 pm hv6e ngawauh 5cx3k(5pery of constant terminal voltage. At the moment contact is made with the battery, the voltage acachg1bwan mpe vbxy56 (u.k 3:p ha355ross 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 conn 8c+0bnydd aeiw92 b,-s0nvusected in series to an ideal battery of constant terminsen vb i,wnd2yd00+9-c8bsua al voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and re bffcl :vylh;qju*5e0sb :g 4*ok2r y0sistance 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 resistance R is connected baegv + s58q-0h;kqa fto 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 connec9:;s8pl;h hm1n x gxjqted in series to a battery. The time constant for the circuit represents the time requ8xmhx:h1 g; l9sjq n;pired for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a:/ucposi6f. t battery. The battery is suddenly removi. fp:t/u6osced from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the sam n,x.,q ntn/uke 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 mgv z oo/7.(0dfb 6cbht *+2qjyyoi5gAC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is conneci 2k a; d30sj w;1zopstz7*w alzdyi,pjy0w97ted to an AC power supply. In this circuit, the currentip,w d;yy0so7i1z* s jw a2 wzjl37;tpzd0ka9

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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 a+2 o:klvmr; bfymmk37 c circuit changes by what factor when the frequencb2 3mly v 7okm:;fr+kmy is tripled?

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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 volt- l vd*tn,r2rrage across an inductor is doubled, the inductive reactance v-drln 2, rtr*of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor apl.) n+e z wjs2px)+lzwproaches zero, the inductive reactance z jeznx.lsww)+p2 )l+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 8 p;+brid5wm 1hahfks/mo/51muo4 m m 9eahb7connected to an AC power supply. In this circuit, the currene osakmm/hp9r duomhfb;wh 1bim7415 ma8 +/5 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 tho06l 5 h evgpkm20k1vge frequency i 2ve0lko k56m1v h0ggps 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 acro/x 5i287z gmu,jbr.r a met-mhss a capacitor approaches zero, the capacitive reactance ofz25r/8ma mtrhjg- .xu m7b,ei 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 c;z*qa 5ob.car+ a 2q dqf-hr zs 5w0p.ni5h,qiapacitor in a RLC qroq d c5z* aq.pw,a;s2qbi.ahzf-n h55ir0+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 ciryut -d0o4y/iql 1f/6rasz, bs jmb7 -kcuit 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 oj jfn5 ebqm. we2.u)8the circuit increases if R increases. When i j)ufq . e.owemnb2j58s this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circu,t,odrqw7 ud( it. The impedance 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. Tz; anwb/dd*n5he impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both doubl+8.1u lwu dgjle in an LRC series circuit, the resonluw +.jgd18 ulant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At r1c s lk,iab2n8p-tt)q*vrc i-plcm33 x8pb:desonance,

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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 w+i(duuhca) ) :9 rk6sfgzrz*gi nt74when

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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 radiutx 5t 3qj7;uave+m(vo j8vn1zs 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 fieldv3 xtzav5je nmu7o1jq8t+;v( vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a unifor :xfoae t2y+k7m magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetict:eo +aykf2 x7 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 0.2. *j cz2o vz-.dul3jx:unmst10 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 arezx:2vt.jsnmc*.z3 2 - j luodu 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 ad qc:frm59oc p,justable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil chan,(n.fddj cd5bges 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 square frame with sides 18 cm. Az/iu;a ,fhmw4q9)h+jed wzyg2ym l-1 uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the i2 9iwu4-)m+gz,mlwh 1yj qh a/f;z ydenduced $emf$.

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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 anc(xm;*tw 3y;q swlq 2mskc(xxa2 n/m) 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 are gixh-e63.n ura $0.20 \; m^{2}$ 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 horizp3 4- tkceh*jm xdsx1k- ev((kontally at a location where the downward component of thxx*4k1 h( -md(p 3 cevtkeskj-e Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angular velfsb2-v ry m;1 tauf/n.ocity of 2.0t.ufy1sva/b; r-mn f 2 rad/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-se +)cmloic/jky h41c1 yctional 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 consingd0a ( cf4e;usts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each wl 40f ufpq+l 9c+ztm;loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which iuq + fmpll;z 4+c0fwt9s 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 ard*7peq, w4 v7+ oseybfea $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC genera60v d no0h37o mtk3irntor with an output of 12 V maximh nk03t0 vi673do mronum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generatodnvf b)2tc .1vbw7a+or 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 6.00 W. The motor operates onz*v6j2:s m3mss bzmb7 $120 \; V$ 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 moto5f 0lh crg vj/.9n:oumr have a resistance of 6.00 W. The motor operates on 120 V AC, 95 j/r0c ufvl.og mh:nand 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 connected to a 24-V gi)lw)f2 xd3 4gue .d7ttf u)cpower supply. The operating current is 1.0 A. What is the start-up cur wc)it)gf 7e.u2ftx)uld gd 34rent?

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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 ro / 2: f dmnw1b:j+crv(lac1lto a 24-V power supply. The operating current is 1.0 A at full speed. dmw :rfr ao: lj1 +(cl2nvb1/cWhat is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supplywld1 ngntt(h g018 gn0. The operating current is (h 0w 8g0gn 1t1gdltnn1.0 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 pr*em(o,m n )l+ oprvbot29*s foimary 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 ae )5avnr7yeh/wj- s0u transformer causes 14 A to flow in the secondary. How many turn e0h5avw)/ ys7rjn e-us 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 a )dnr(a(2zghp z d*f,cre necessary in a 110-V primary if the 24-V secondary hasg*zf ()pr2nhcdaz (,d 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 )6c9k flt7y3clu.8 *i*ekj)xs rdgl rprimary coil and a 2000-turn secondary coil. If the curreneyfcdl3c7*rl l9sx k8t ij6k ug))r*.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,1 s8h .sl- fiy1sq9yh(hmlca a transformer. Assuming 100% efficiency, how many amps at 24 V cahml1,fas1y (sh9ci s y.-8qlh n 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 10.0 mA. Tht)hvvq3b i0l8qi i: x v,z/pu5e primary coil operates on 1pbvv/5h x3lv8iti iu),:q 0q z20 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 o4agauh2(.w h60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is appl2auw 4h(g oha.ied to the primary, what 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 300 fihj3bij*7xz 0 wde9:turns on its secondary coil. If 120 V at3f*x i d9z:ij bw0h7je 2.0 A is applied to 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 transfo ktz29iqy 9iwq/.bsj 2rmer has 100 turns and its secondary has 200 turns. If the inputz/.9b2i s9ki tywjq q2 current at the primary 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 (m2f)iiikf0o secondary has 200 turns. If the input voi(k f) fm0ii2oltage to the primary 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 turns. Ifg66s1cnk06sq/ frafu the power input to the primary is 100 W, we can expect the power output of the secofa6fsr61/0qkg c6usnndary 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 12anni.1x :8uxr: a1yg)0ct vuo 0 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 201 aav. n8oncxr:0:u1g)t uiyx0 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 s*uv+n z18g db(wx qg)lvj3.h 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 l8w n) (zvx3g gd .hbvulj*1+qsost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually s. zkv gkl(1s/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 insk zv.l1(kg/s the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0e4a0/zo (op) w0 r*efnok8jym.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 benzjfae*o yok0)ep0wr(8m4 /o 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;jl hzlfzk6y gp-+50 e km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy lzfh5 ylp zl-0+ke 6j;goss 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 6rlw1/(c()aui ud88 itfsx gy/ z vp9:7l gyt/o-W line at 1000 V. How much less power would be l)uva c/9ix(/ldlf:syu (tip g 7/o8z8w 1gyrt ost if the power 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. It is to be transj77pob3gm 3vi.q*uyxmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up o3 .y b3x*v7jqipgu m7with 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 vo/ ikksq.n qz t90n7:qmmj8 +stored in the coil's.i zkkmo0jq7: /qsq8tmn+ vn9 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 1 d8o +.5eihj,gr oyx5k8-H inductor. What is this circi8k5 ej5xh ry,+odo.guit'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 rmx fjbgk*8714jj 6v1kf5oi w jls 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 th;gqz; h3n 9iv scza3/ae 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 resistanj o r0wx4a mo(0ewb(o8ce of the lamp?b8m (4o o(ejr0w0o xwa

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supplykjlr u* i))8zehm 29fciw 1p7g. What is the peak current through the resiu1ejhr9ckfzl7 mp g )i8*w 2)istor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected tod.y57b a*ki f6 fjyfv; a 120-V ac power supply. What is the power dissipated*;5 afj y.bfi7yd6kv f in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 5 u)g o-ep /otvr+.it)o0-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 a v6dgo.4 zk8ximm5 8o50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resisto7yc :v0h kohr-0o27r:fbag qyr 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 induct*7r;sumc;1 hvrzq x r)or 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 r0n8g* omat bs5eactance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W on msm l*u2a2v 1js73anh)lhd.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 W of inductive react56i te,wp5y3fd 7 kfvnance 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 aa* i(+my- yqsvt a frequency of 20 kHz is applied toy(y+ vsqa-* im 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 yeeo7cwkf e+ k77yk2:110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitike+ mxvw1 8ad).f hj;yve reactance 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 capacitive reaqp d:h 74mpx/dctance 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 0u7htwz5t f eymc5/ 5la 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 capacirp :ezujvs6vjvq83;8 (ut ub* tor be 100 Wvv8;8ejjtqr: s*u3vb( uzpu6 ?

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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 capacitoq48z 4ds xf*jk3n c1vyr 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 resis3vr)w7pay k1 gtance, 15.0 W inductive reactance, g)3v 7kpyarw1 and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 1x0/y t3w;g xcu-b+pbc 00-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in stg c/yucp-x30+; bbwxeries?

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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 resi08ep *pjbu urpj/16db stor, 20-mH coil, and 1.0-mF capacitor arj*pr0ueb1jp68 / pubde 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 in series with a 20mo):kf m)cuv) *msif1 6asb /j-mH inductor, what is the i1 sv fi)m6 b )aojfc:m*k/us)mmpedance 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 sey:. (;lapfiaqx9n x+yries with a 20-mH inductor, what is the phase angq p9ya+:lfxn. ;yaix(le 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 nj7ovebt: 7anz/h(3kuh;f) tmeeded in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total imped)3( h7 ajobe knzf/;:vmhttu7ance 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 serie7biv ogo )+i3os with a 100-W resistor and 15-o3g7bi +i o)ovmH coil 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 for a to 0zrph1 qx(thn4ew/zbh5/ni:tal impe/wbh0pt/ q(zi4r ehn 51nhz: xdance 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-kWf* dxp5 n. 85hci43ybycl7e xj resistor at 1.0-MHz for a total impedance of 1505h d jclx4ey 8byx7*ic.p3n5 f 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 c*mvbyp2yc 4gc2t t-9 a 20-mF capacitor. What is the impedance t4yc2gbc9m-t 2 vp y*cat 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.u l0 orhj,e6x-0 kHz for a total impedance ,x -ol ejh06ruof 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 capacitdfnjg5hu*1y 1or at 1.0 kHz for a phase anglfn ug1*hdy5j 1e 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 ecq;f8) 4ji qzat 1.0 kHz for a total impedan4cif 8eq ;qzj)ce 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-mfub:lh +9 2rwwF capacitor at 120 Hz. What is the phase bl:9 +fhw w2urangle?

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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 and47oo i -iqxe)u 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mioiq o 4ex)7-uF capacitor 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 resistor, a 10.0-mF capacitor, an 3w q97prswvr9d a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms currrw9wv7qp 9r3 sent 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 olkf3hmv p;l-7d w,/b yf capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60 wyh3v-;bk/l mf d7pl,-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resistor, a dv:fumhuv ::410-mF capacitor, am uv:4fu dh::vnd a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necdet: cpa4d s::bc-evslf0;d) 3p x9w cessary in series with a 500-W resistor for a phase angle of ;0xsd4:t pl3 dfc:ev-a w d)ecs: 9bcp$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 q4uj tf6tcb1y f) ukn)925pc7id9qhy mF. At what frequency should the circuit be driven in order to hjyict)hqtn9u )d9b 1cp54 u2y6f7f qkave 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 sy ln1ry9sz -6:nc0sk circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactazskyyn -:09clr6n ss 1nce, 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 cir avwn/2 g c8q6oke;4urcuit 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 oflah5 ocra;5 dg6jz8b . 60 W and a resistance of 30 W. What is the power r;d. j c5z5aabogh6l8factor?

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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 resi xduu. a293mqe 8xg+festor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a daxx932emu8qg.+u f e60-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 fretpdua qk58 hn8 2*nzqcbhao,9 p l7b-,quency of a 1.0-mF capacitor and a 15-mH coil in series?-8qadlpta zqoph,c985n ,2nkb 7b h* u

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needqlto /m0 13epyed in series with a 4.7-mF capacitor for a resonant frequency of 10 k1m oe0yq/lt 3pHz?

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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 fre gx*ev ag6*nz6 )sdwstm7z(i+quency*d+)m gxt6 nas7g6wviezz * s( of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W rblq:wxa(wm/l6 o9t2r esistor and a 40-mH coil if the resonant frequency of the circuit is to (lxqbrt w: al2w/69mobe 1000 Hz?

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