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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 m+skl6q o+ dsq5agnetic 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 sts 0adl9w*xs,m ates 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 7tm z)qrv 0ww1of wire in a coil produces what kind of change on the indwv1qm0) ztr w7uced $emf$, 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 2l6* gte8rpjw eu-nw3ts pf )f0 ck*6kfield through a loop of wire produces what kind of change on thef p3 0ksketlu-*f2cp8nr *6g ewj )tw6 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 ofyvv8ek /pn 7/l a loop of wire produces what kind of change on the indu/ ylkp8ne 7vv/ced $emf$, 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 field2oz l;aic.lme7* 5w 0 rzn.jqo an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conductor /rs f0.lkz+lhwill be that which tends to produce which of the following effects0k.sfl /rl+hz?

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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 magnev ;+:gdkhl3hz4zmk :rb8:des t is held above its center with its north pole pointing down. The stabzdm zh+;4ked v : rhg3k:8l:stionary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is 8ds ffq*mfb7c5pkd glt )p9 ;s *x7lf1held above its center with its north pole pointfk1pfc*s7 ;fll 7gd58*p)std f 9mxqbing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic fielrq nrhxt3 0nev hvo/7; q8vn*6d vector points straight up. The magnetic field vanishes suddenl eto7nhrv/;vq 0hqnn6 xv*8r 3y. 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 v ujbfgt2g+4k*2w 3hukz +bidn,9i o9 3 iq6glthe magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the ind+dkuq 43 hgvk9+ tog2b,n*2ji3wlib6gfz i u 9uced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table s 7v )a57v vqpd7uwcch68he6x 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 t6 ahw7q e8vu)dsv6c 7ph vx75che 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 tfquwh9s(-(0ps htyz/ able and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one s/q-(h(y9tus f0h pw zon either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pollon08zi3bez4ju8gr1, c i2y vu g0e,de entering first. As the north pole enters the wirlz,30er b4 evu ujo z8,g2n81 icgiyd0e, 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 whks 5486kp pybmose direction can be varied. In a region where a uniform magnetic field poinps5p6b 4mkky8ts 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 angn mm/jebi *96 6qkn-lqular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straighn-b6lim j*ke 6qn9/qmt 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.eui.9 vcr4 2kk
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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 thadac.qa6 s+)iei0 un;ut an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. p bgk3+nzj0 z6 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 diruxli ,v.qf.-s obxf k6 t3nc0 ,ch0cz5ection) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the ,00i5qtu6x,of zs-fnblcch3xkc v ..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 angulsz aeqv((d uw 1u41-dmq)tk;av y7r6 sar 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 generatodfwns 5v;,sn*r transforms

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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 eaf 3mk-1ujzw ;pr4rh4rs wk.*i ch second. The frequency of the ; .k1rj 3wh-4f*wr4 muzrkisp $emf$ 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 u fa)rd2yy vpt0y -.se1sed 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 deun7;/o9)i ypwdm6s movice 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 more loops than thewi lxoh) -n.e+ primary coil then it is ai eo-wnx.h )+l

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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 thanhol ,jxpn6e0v /9 -ikf the secondary coil then it i,n6/e9 jli-xpf0kohvs 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 i az+(sz ,(jcj59(z huqlp kpt)nput

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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 circuit md .)x -y-jgoluw)3rb,

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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 3j. 0bnr 4kfkcconnected in series to an ideal battery of constant terminal volckn34k0 fj. rbtage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of consve.6 ws-hepz*h/9vhy tant terminal voltage. es 6yez.vph *9/ h-hvwAt 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 resisti-dx5*3honl,s)q 5on 1 yqq uiance 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 resistancm jv 4bunet359cph7) de 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 s q s9qfhh7p*c1eries to a battery. The time constant for the circuit represents the times qq971*cfhhp required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The battery *q;vrugkhg/ +4.sec t is suddenly removed from the circuit. The time rqg;uhc+g et 4s/v.*kconstant 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 hqiajebkcb,w4(c-n 91 c+vrura( +sy 0ave the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the currenh3lasf j 9qw495 rn/yxt

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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 conwolwza 6su8/-nected to an AC power supply. In this circuit, the currenal- suwz 6/o8wt

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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 frequ /8ez*bx yk6lrency is t8 e/xr 6by*kzlripled?

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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 doublmv1) ;wvwlq3tjy:i cm7ev1 , ped, the inductive reactance of that im1mq :vy e7i wjlv ,);tvpw3c1nductor

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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, the inda r b6+y2nw:pnkqye5 6uctive reeapyb5wq 6:+ n2kyrn6actance 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 conn4,xa(y 8w8ex r -maqkiected to an AC power supply. In this circuit, the curren,m - kqi 88axae4xrwy(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 frexvo8mxn/f h7 5 v,xa,uj9xbug4jj9x9 quency i xgn,jv m9 axj4,x9uxo5/97hbfjxu8 vs 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 Aeehhtvqkl.5qq(0mi m 9z6v 4)v)u hu9C voltage across a capacitor approaches zero, the capacitive t6zkl v4 uvqhu9 )(vqqehi5.e0 9 )mmhreactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle b,j + cq3qi3bzretween the voltages of the inductor and capacitor in a ji,q3c b+ zqr3RLC 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 RLCq9zjnv txhs0 pni ;smm j*-8;. circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R incr9mg(: 0cwbv/t(ofuibw / u v3zeases. When is t/owcgi0ztu (/fm:ub v3 wb9 v(his statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increbb;6w q4u ;bcwases 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 increases pe)p btb-n3x b87g *kgif $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series7nc h6+tdw:lm circuit, the resonant frequency of that circw nc76mltd+ :huit 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 rg3 +cznnkq ,3AC 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 occur6ibl r*mrrg w)pba/lh wm 9iqy 0h* 2xt8n/,y+s 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 magnetic field o) h dff6ow.3ltf 0.20 T. Find the magnetic flux through the loop when the plane of the loop and fhf6. )wotdl 3the 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 0.1s8q*)kh i8wa k0 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 magneqks i)8wah8k *tic 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 uc y814gn9exn qniform magnetic field of 0.20 T nx9q1n84c yge. Find 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 sin3u85yqy dr p;7o1idfngle 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 changesx e* prssz4e5i;.en1 h 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 wir +m;mbb ;d(ucde on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from mbuc+(b;; m dd0.50 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 o-i2c kg uo13b15 turns 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 a y: eqqqckw 0jcec1u0x .st8m7q 6t67qnd 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 loc ijpb ex.8ml5u3)ue*vation where the downward componen mu*li x.ebu5 v83jep)t 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 ivuo+nx0x 3 sw;f:ta+es 2.0 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 constant magnwue 0f x ;x+3satn:+voetic 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-sectionalnf r8r * qow 91bg1gmlnqrv8pz h(18*i 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 wd+9f kvys 9t) fbwh*;p5ikz+fire 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 b5u km3 ,yrsqg eakkyn2 8a3s n9gsw 7m9k1;g.its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magwanky ,98es ku nmy5s19m37;s g gb.2qa kkr3gnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 tn 7:e. a9byuvlurns 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 con2g 2t6nyzfr6nk v0wm/ struct a simple AC generator with an output of 12 V maximumkw fnn2gtr26y/0z v6m 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 generatop 0)3 ;vgk8dyqowp9 2 o.zsiynej7b-pr 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 on )us1,dctejh vgs4u04 $120 \; V$ 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 resistnq aa9:; -7kvqw(4litk owhr4ance of 6.00 W. The motor operates on 12wi4a7l- 4a q(knv:9;hkrtow q 0 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 intern ,kx/ 4rvkn j3).sig0 nuzl8rtal resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. r3jsi8nv 4.kr ng 0/,l)kzx tu 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 conn3yyzb u-uo+1+bm516foj fos mected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the +uz65y- sb1juom m1byfoo+f3back $emf$ 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 connecte +7dlzzh1 io6hn6h kd5ug:,atd to a 24-V power supply. The operating current is 1.0 A at full spehu +k,z1th z a o:l6dng5hdi67ed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary vol2o.f; lg7o2d lr i1iratage 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 prima( (wg9aqgc,)vsa8fd:0domn n ry of a transformer causes 14 A to flow in the secondary. How anof ,c0(admg(:svdq8 ) wn9gmany turns 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 are necessary in lm) vb7;md2ema 110-V primary if the 24-V secondary has)ldv 7e mm2;bm 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 261lpvdut fygi*d74a ( 000-turn secondary coil. If the cup(*lgu 4id617tfva dyrrent 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 flows7n-. jkyp 3uba 6nm;b 8fxef,t in the primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in j3ne, .ap-kb8f 7;x utbf my6nthe 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 providg :*)fws hwxmux /l 9fwkm5:2-suma 7jes 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primakmmhs-ffj m/9 :xlws5)w72axu:gw*u ry 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 itnl+ 2+ye ;x;d clkj;t k-6ehsys primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is-+c ;+ex;l yykk e; hl2stdnj6 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 turns on its f -4y j8eh7tz(tixzb0hqnc7 ,secondary coil. If 120 V at 2.0 A is applied to the pri04czz- jy(ef8hbqt77,nx ithmary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turnst v8pa) /f8 ewkbqq s4h,**usp and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondary af)pupshqt,s 8*k /evqw*48 bto 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 secondary:cx4r9dr* u;,ognql05 xgk aw has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secow94 ao*r,d: x5 nx0c krg;qulgndary 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 n db2vb+*j u2xhas 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting fri2u* jnvx+db2 bctional 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 1t3 a/dxjws+z. +ned: h20 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 num dn+/tas3.h zw:+xed jber 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 vz.tx +k48gackab/e)i //u cafoltage is usually stepped up to 4500 V by a transformer and transmitted through a power8+fkcgztck/u4/aa i. eb /a)x 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 current at czpxld,,i:nt -7n rbhx sy*1*120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line oftsbzp y1r nx -,h7:,*dxnc*li total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a p.y1 fg+k(drd4;dk2ialw x6ttotal 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 axwi2gr.yd+ tdp;l4k 6 kd(f1 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 line 50 km long has a total resistanc ta0077 )fzfuv+*2ucaowwwffe 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 percentagef u + zvw* fwfcf0aa20uw7)o7t of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power would be l r.g5 yq,:ueag(.hxvfost if the power were transmitted at 3000 V instead of at 1000 V( xhe5qafu. ,:gy.vgr ?

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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 44c)lhz3 :2 bq6epq d94 vvrpyc30 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transfo c p34h )yecvq2pzbrqlv3:69drmer 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 stored in the vad6 uka*ap1. coil's magnua.v akp6d*1 aetic 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. Wrd)80zc3k yrchat is this circuit's3)y8r ckz0r cd time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltai*u+/+rbap/sw.6fhh gu v8 ubge 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/kxk*qe6 3o ca AC outlet. 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 resistanc.lld 4/m mw*r0:qkn e9rjog :je of the lamp0 q:m9r w.lr*ke/njjl d4 g:mo?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is p(wurfo m z) lq+wf:+w82)lsvthe peak current through the+(pfzlm+8r) )qf2www:uvlso 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 +1 3j o, w 6i0qjz*iryldhya6c120-V ac power supply. What is the power dissia+cdi 0jiw*,yj6lh6yzo 3 r1qpated 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 50-r5lb+5gjb4hfpx 4 3m lW 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 xtsri6 k5/v9+o-5c 4 . gf2.u( udqjotsuhztua 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W6/ ,hsxynn x:l 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 a )25dh ixp vfa)p8fq:y 0)ijwtt 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 2octs9: ap+dr7 .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 z/j 3f*b7 imhcW 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 inductive reactance at 10z1k ttd1qpufe1+ 6;ec00 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 induccuo9 pcz - /)do4)ak) aogw,nctor when 120 V AC at a frequency of 20 kHz is appliego/ooacnpkw cc )z,)4)d -ua9 d 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 so maznfj;rd w/6s:2x.f urce?

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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 capacifv c .yy6/fjfy;l)cv w2c w7dhj,6m -htor 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 reactand 4+.au)1epu-;wszgij 4tghm ce at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a r0-f,btzvl 3yi2 cs)xz 6c)ahmzte9 *l b,n2myeactance 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 cau5k9jcv v8rj(v: uvc+ret) 4ypacitor be 100 Wvv :r)e( tv uu59krjv jccy+48?

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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 capaci/41 xokjo/les p*wr x9tor 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 resistance,p;8smlnuy ttsa 3oe1ja7 8p t794xa-a 15.0 W inductive reactance, and 13ea a4tsnpx7a-ma8t 7ypo89 j; 1utsl0.0 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 imped6elab+v 9tyn2h q -ox5ance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mFo antqxhy+e-9lv2 b 56 capacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 8 c8wt*tf (sq.md wr.uHz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor ar.wfw . u 8cdtr8(stmq*e 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 20-mH induct 8jaj- 7clkxn(d p5qf6owf t8:or, what is the impeda 7fl ak5q8fopntjc8(wx- j:6d 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 oe:l3 vv*blvtk 81c8pv02ffw (vb5v2xjr, lm-mH inductor, what is the ph(fv28 vfbm5ore p3x0*wvv2, lv8c tklb: jl v1ase angle 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-mF capav2wr +mb6 o.gicitor for a total impedance of 100 W at 1500 Hz?.2m gi o+vbwr6

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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 s:l,d;hch9y s c+nmu:r eries with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hy;cd:h+uns:l h ,r9 cmz?

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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 indekc 0v .imqb4r iz,;:guctor at 5000 Hz for a total impedez:4miki, 0rqvgb ;c.ance 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 igfzv.kd+0u7 b n series with a 100-kW resistor at 1.0-MHz for a total zf.+ kd0v gu7bimpedance 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 in4 vf*-hmym nk .aif67e series with a 20-mF capacitor. What is the impedance at 1h* m6eynfavmf-.47ki000 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 10o98h 1 nvo 8oual0l)zri)h u+z-mF capacitor at 1.0 kHz for a total impedance of 45 W?zoz 98o u0)v lhhln8 +o)arui1

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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 ayek t y r6oi9i e/qptv+jv7g f62.//rlt 1.0 kHz for a phase anyvt 9vi /g6.7jkrr+ f2ieqlo6 /e y/tpgle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1k5ita3 f-zqo 8.0 kHz for a total impedance 8k5toiq3 a-fz 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. g4aqt.vpu 1ka e 6 u-a ap,f.ffjr8+(fWhat is the phase a-(fk1 gaeut+. 8f. a,64pauapfv jqf rngle?

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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 resx li;0 zv5drmmayr+3n5v66qdn1 xm0sistor, 20-mH coil, and 1.0-mF capacitor are conn0r d a5+xqvm r l15m mi6d3nznys60;vxected 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(qh+x3hij4 feo*g g k) of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power suppl g*oi fhjk+4 heq(3xg)y. 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 capaciti(ehlq p4ynzc 2*y)q5ove reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What cuo e)*5 4ylzp(yhn2qcq rrent 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 angle7 - :fmk jlle2zh*e*: yejtz( sqso29x for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when c2ol tsfx7:hzl ezkye-2s9 **j mq:(ejonnected 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 necessag ugq,xmf)+7xqnhm 3/5ubts wdh 7( rp88mk5xry in series with a 500-W resistor for a phase angle of s)d, q 53xfq8px75hgxrt +k (wg nh/m8muu7 mb$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frxhni5du gf drs 34j4/bu1h;8bequency should the circuit be driven in order to have maximum power transferred from thedi;bujd8r4b1g h34s x/f5nh u 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 x(ox4 m/k9/lezclpk9l )vryhssp). ) an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit ioxe9(z l).9h/y )vl/kc mkp4)srspx l s 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 cq / / fped37jc6hlk.ohircuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistb-4lwwwisv xk )3p (+bance of 30 W. What isplswivb )-k3b (w4x+w the 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 se ds/mph10mchrc4j cu.-3r 2f aries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when conne1 u4 rrd csjm30c/ch fm2.a-hpcted 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 frequencycye;s**js t7q of a 1.0-mF capacitor and a 15-mH coil in series?yc st*q;j*s7e

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mmz6 ts3hmn.qlb z5 9p3wr o96bF capacitor for a resonant frequency of wbshb l6zm9 .zmt o533 rq6p9n10 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 frc(/y:o nmgqh /equency of gc:(hno/ mqy/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 wi8b)2 tus fdergio60h*y:,nq xth a 30-W resistor and a 40-mH coil if xt :rf 2b*geq6suoi, y8n0)hd the resonant frequency of the circuit is to be 1000 Hz?

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