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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 ajt7:ripv,wz 2*j:o.y64+ hf uvmdbpwre units of 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 statesqxy(a/e zo1m8cr1t +b 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 what kind of c*8tky: 3 -p-qyh3nd g+yhep+wwo6ij m hange on the induced gh * w -e -+36 3y+kqhmipypj8wyod:tn$emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire produces hb*4b)foa9 *jr.(ld/ zyvxnj(jt 6guwhat kind of change on the inducj9 voy t( bu*xr .ajl(g*/hjzn f4)6dbed $emf$, 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 pro; t)cbsrq3u,d, fsffx(h*2 efduces what kind of change on the inducedd)*etfuf3 f xc2 rhf,,bs;q(s $emf$, 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 evkw+b :vuj b)h -nde)ryk56, 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 dire5*chrqe .i c)8xd( zrr4wnw4s ction of an induced current in a conductor will be that wh 4d 4z(w ciq)rrcxsnwer8* .5hich 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 flat on a horizontal table.acwpua -li6/ 8 A bar magnet is held above its center with its north pole pointing down. The stationary w-iap8c/lau 6magnet 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 heldo4k)1 2iep ovsoi1o tcdk,5z6 above its center with its north pole pointing down, and re6zotd4cp5k) ,oioiv k2 1os1eleased. 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 field ve; 2nwoindmx+:))b mszx h1f8octor points straight up. The magnetic field v: b woxnf8+1n;)d s2m xoi)zmhanishes suddenly. 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 regio, coesoc0,zcx: nt/r:*.kizxs02f l zn where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. Whe*t,l , r. c/xefzxo ss:coz0kz:0 2incn viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table+ joa91zj4j ym top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the directimy 1 +4jazj9ojon 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 h vbk;4u3 8zvwhorizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire.3 vbwuv;kh84 z 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 first. 1(hxolke i we e6d7*7aAs the north pole enters the 7a*ke 7e 1xie6l(dwho 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 c+qqccnryhumy t / .t8 ipf36-icpv:6) onstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down,c un6:t8 rf.+m63qp)pqvthy icc yi-/ what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whosenoq05vgvbr/vll2 ,l6)c0 na s direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if theqc0/ l0 6g2svrbo)ann ,lv5lv 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.e.. 9x *2 u*hdrucaiex
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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 t *40h (onqhy4 3os/ azlxcq1qehat 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 fie (n2wf pkcr3m/ld. 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 tl +mhf.yy z/a6he east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a stat layy6./zmfh+ement 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 conam0;wuwnd.n + e6 ez/haph (74idxuf)stant angular 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 ,w(rpswtys+spm00 w 2transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotatenx3:3( tcar gjs through 60 revolutions each second. The frequency of the xng(a3 rtj c3:$emf$ 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 us)7 p6qqvaz/oq 9 duy3ned 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 dndb x5j9*w,h*s p oj p8 :prv)(f j;5mqcu3nhlevice 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 co cuvtl4nxp w2zm24/+2iq u8 gantains more loops than the primary coiuu 2 l/2 tv xwpag48m4inz+c2ql then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary c- wy8zy ydep:y(5*bi5d )ywsf oil contains more loops than the secondary coil then itebwy8 -iyz*y w)(ysd5yd: f5p 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 po1fvk (om+o(nsi1l oc)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 +dklx3 zk1hzbh21py2 circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected3do:e+n/pq: gr7l jvu in series to an ideal battery of constant terminal voltage. At the moment contact is mgd/oue +p: lr:n7jvq3ade 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 oy )eiz; uh7 *ren7v(zconstant terminal voltage. At the moment contact is made with the battery, the voltage across o )i;vun7(zerh *yze7the 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 connedoa ho-(qyi--wv1pnf g9j89i cted 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 tb l7p0 dt/ 5wssdx2j6fo an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. b4sqej. 0xv:d/jkr- v The time constant fsb:x-jevdqv / kj.0 r4or the circuit represents 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 connected6 e-uncku,klykf1f5/nj ; bm1 in series to a battery. The battery is suddenl -kcum uejfnyn;16k,lkf5 1b/ y removed 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 sams8qdn+ f p)6cce 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. m2se;9r:r,.nch2p )atqjqhq On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, th*2elz s,vyabczza f0:jy(w7 *e currenbfaz* vw*ysyj:,7e0 2( lazczt

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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 whak6gxo +z z2:ps)wdj2 g:01i9 pjmswzc t factor when the frequency is trip+1c::gz9po wxz2)gz6jssjkw2 dm ip 0led?

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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 doubleddm5y j.zp*d+i5t qnca4dth +:, the inductive reactance of that inqh 4d:*ip.5dn +ttd+mjy 5c zaductor

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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 i f* cp,(myr)odnductive reacta, * c)oprd(myfnce 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 circ..zogr/j3jj) nb h+ utv t6alv7)xma5uit, the current.rog)zvbjh/l3ju6m +v x5ajn.a)7tt

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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 freqtxahzxb*p2 c *x4zzvt, 4x-.duency is t d, v xab2 thxzx44z-*pc*xtz.ripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the capac2mwea;,b kg9o itiv29 ,b aewkgm;oe reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of th k fn :fg0(8dqsmkw.4x5rnv8 se inductor and capacitor in a wf :sx.m4ndv8k r( nkq0gf8s5RLC 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 circuit is defined 9yrv2+(oh; gli y48 lx ewm7khas $\cos M = R/Z$, 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 incrakg )twc951+x9yrbt/mb hbl 3eases. When is r9c3mbb/g l+5 9bahtx)w k ty1this 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.ovd9*n* t3a yrc.kv7q cy*xn 7 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. The impedance of the circuit incp*f rgnuraw5 c 36i,;ireases 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 m+h .qolo3/p4j8pl ircapacitance both double in an LRC series circuit, the resonant fr lm.ji+hr/ o8qp 4lop3equency 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 voltagp3i0,y pqa* h)q cgreoyhch m 885r/0pe. 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 ac)pjw *kd ;0eoccurs 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 unifor)gbgm3(1;h ml mgyitefu 2c+7m magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane cgey7)ihg 2t+b3ug(l ;f1mmmof 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 rotating in a uniform magnetic field of 0.2mfz br.-jm ;/k0 T. Find the magnetic flux thr;zbf rkmj/ -.mough the loop when 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 magnetic field*sc y6s;mitu0tf0ho ( ih5j(k of 0.20 T. Find the magnetic flux through the loop when the plane of the loop a; (k6ystuhj5to 0fhis* (mic0nd 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 2;i 1zmi .xsycof an adjustable 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 changez-lxy7-znp. yu5 0ictt*h )mxs 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 wi,-xp p7 t j5khz-jm/op6wfkf() vygn/th 200 turns of wire 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 0.50 T to 0 in 8.0 s, fi, jg5mf hp-f)w tok7 n(jp6vpy/k/xz-nd the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area of ff:w- nyrss4 u6ezgj e++:m/*felk5f $0.40 \; m^{2}$ 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 an q.0q/2 wo y-naow2guvd 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 location 3qecqae 4. m,dh(q 1m w(i/i+b(sexz kwhere the downward component of the Earth's magnetic field ihz,/ kqqc 4maxd s1bmeei. (3i( (qew+s $6.0 \times 10^{-5} \; T$. 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 thvs2cgwjz 4dsa)k(h /7 at is 2.0 m long rotates at a constant angular velocity of 2.0 r cga(z7k/2)4swj hsdvad/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-secj a1eyzpq+de h 1lv9s ijqm*a;cl:*8/tional 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 10r3.5o( hpvk,5( fvaw mtpq ,bg0 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 recta(v7zj;mv va* 7dm0x*.cov gmpngular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, vpjvvmx (vd*; mzc oa70.*mg7 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 consiyt p8-n *thha7sts 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 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 generator with an output of 12j:htb5, d2l mg V maximum when rotated at 60 Hz. A magnetic field ofl:,b g 5jhm2dt 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 generator with a ml-2del h4q b92usdbr5aximum $emf$ 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 moto/v(/2cyeu4atmdj3fpm t v8k 1r have a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motognqzb0)0 e8a ljul fi4a9b5/ hr have a resistance of 6.00 W. The motor operates on 120 V AC, and when598ae/ njflbh au l00 gb4qiz) 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 powva)o/a y8s7 6r 8gudfjer supply. The operating currs7) duvfj68ro/a a8gyent is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24* ss p x7kc-l-ixk;pf1-V power supply. The operating current i7ix1*sxkppk s-; l-fc s 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 resistanceb9sx(t 3 *pyib 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at fubity9pb(x* s3 ll 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 5dodmv i1u-. (yxwh8p primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the nvdf q8j,w( ilc w;f+1secondary. How many tudqjf ;1w8wl c(f+in ,vrns 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 man2 u.6m iy2normy turns are necessary in a 110-V primary if the 24-V sec6mo 2yn 2r.umiondary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turc. 9hv+qeuc -g.trn)on primary coil and a 2000-turn secondary coil. If the current in to-g .vtcr.9qc)e+nuh he 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. Asi7ti0r qzr hh9a0(bt; )-oc+e d8qjo/ ;bbon ysuming 100% efficiency, how /r -0cdtobjhreh)+;qayib79to 80 bqoz;in( many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transfa1m0; ueskkqgq,l9jq;4db 5vsn a n3ij8-z.mormer provides 7500 V at 10.0 mA. The primary coil operates on 12 . mni,0naaq9 zj-8ujg 5qe;mq3 1 bkslsk;4dv0 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and xg.xq7 cgs3+hmwej ox2vc05 .zsdn23 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, whav0j .3qz d3s5xhm2wg cc n+og2x. ex7st 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 turns on its4b sa4sd jjk,3 secondary coil. If 120 V at 2.0 A is applied to thss jj4d43 akb,e primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200s6vu dmp df8w5q1qi 41*pgf0b turns. If the input current at the primary is 100 A, we can expect the output cm5f1sf 4uqd p6 ip*10dgbqv8w urrent 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 secondary has 200 turns. If pk:0e6vu ucbb(9.tq f ds/df0 the input voltage to the primary is 100 V, we can expect the outpub9:fcvkdtb6f u( d0upqe. /0st 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 tufy* pkmb*r0 2frns. If the power input to thk *prm0f y2*fbe primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage-0xe2gpy06 o om2hq ta is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 6-2 2gpo0q0 x oytmaehW. 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 voltag7z(3pq tn k,8smin 1xye is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W.8y ,3m 1ktqzx(ps7 nin 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 120 V. The voltagewt( xjm (0xuck)s bw*/ is usually stepped up to 4500 V by a transformer and transmitted through a power linuj(tw bs/x m(0kx)*wc e of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of -y1ojc8p .xuilm hr) bx(r 14z0.60 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 c xb-y .)1x8ui (1rmloj4hprz 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 resistance of 0.60 W. A generabcmy6)7a4v m y0oge4 ator 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 ratiobm v4y7mea4o) 0g acy6 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 )yr,r j+kkaa)a 6-W line at 1000 V. How much less power would be lost if the power were transmitted +r)kayr , k)ajat 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. I-r:zw(tgw(0f6m f7pm s y-vdzt 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 thmtf-0dm pwfwz67(y:z (rgs -ve 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 5.0yd3lqjx , fpoh:i5s-8o -go 8u A. How much energy is stored in the coil's o-y8o x5sd fi :p3-ujl8q,ogh 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 containsf6od uioe ;mj) f2k az59(yz3p a 6.0-W resistor and an 18-H inductor. What is this circuit's tioi;(dyf9aup2m6ez3okz )5 f jme constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 120 V?v bojs6; :m1s) kqz0gzdf-bd+

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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. cgt;)-n9k3 hn3ocdb t 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 resistance of theq4dx.5llkty lb.2gw - lal tkbyq.54.wxl2lg -dmp?

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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 120ucc x * 5nvwcp.m7p5,k-V ac power supply. What is the peak current through the resistocv,* pck5 n.5pwxcmu7r?

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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 avg + ga/7l)q))u(j g soyxnz s4b7.tzlc power supply. What is the power dissipated in theg)zy)j. t+sb4 zg7l 7x/)ulqn v(gaso 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-W resistor /) ubdj zg8j;bis $I = 0.80 \sin (240 t)$. 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 t2.kmg: dqsls+fht1lpf4( q. 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-W pbl x ky,.bs9 curetya93jbsf.4 +2s 2resistor 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 mjqd/dw j(c l (r03c,.ezaly/ a 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-mHdh4hx bob 4 s/kgm;,b1 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 sind ()6,ws;2ciaj2t ms vd,hW 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 tdmkuqrb f/va 035z:2 reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequenc o rk+st5w5w+my of 20 kHz is appliekt mros5 +5+wwd 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 e f7e+qiw c0,pmn5x2wa 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 capacitive ao/2z lrv3/twreactance 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 have06ht pf * 3xqw2mm,hue 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 a1 t(gkmo2:p5 p ufsc*m 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 bdd 8gvhg ,c,i9e 100 Wih9d8,, g cdgv?

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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, p i,,jv gwq8m(d2;7g;i.vpm xhrim o-mF capacitor 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 d-r iwrm3qt+:12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacqdrmi-r:t3w + itive 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, an*z musrbu inr 1d3)0.dd 1.0-mF crird 1s)znb *0u3dum .apacitor 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 Hz if a 100-W resistor, :k ukfie-i588la f5nz20-mH coil, and 1.0-mF capacitor ai-kfzenuk5a: l85fi 8re 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 ix)f4-zbi)6 lxq)yq ahn series with a 20-mH inductor, what is the impedance at 1000 q ihzl6-qxb))4xyfa ) 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 vajj 6yek*;+b opdk/b,+1op ha 20-mH inductor, what is the phaseov+jhak pd1*jok,e6 ;pbby/+ 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 neep: uxt+zngs2vxv9b0 (ded in a series circuit with a 20-mH coil and 1.0-mF capacitor (xvxvsbgnu 9+0t:2zpfor a total impedance 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 followilod8ci l u 0q+qx ga qd9r)6,rs,my8.wng capacitances is needed in series with a 100-W resistor and 15-mH coil to get a total q.d sowg)x0,r 9lyr+8d86qulmi a,cqimpedance 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 5eq;d;5s hotra total impedance oht 5s;rde5q;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 wi cbns3r)3bpv-th a 100-kW resistor at 1.0-MHz for a total impedancb sb-c3np)3rv e of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series wit1v6tjx,i z:7t )x*szkdy wrp1 h a 20-mF capacitor. What is the impedance at 1000 Hz?t1 vzd* 1,t:rsj)wy 67xipzxk

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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 suzma- 7zb;g2ml n0two:gq-/ueries with a 10-mF capacitor at 1.0 kHz for a tota0zu /- 7mn: m-w gt2qob;azlugl impedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0nl+pkiy;4q qo2 t,zd) kHz for a phase2ptn o;zily)dq+k q 4, angle 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-Wdx ) ( beihi hrixp,3o;bg+r+9 resistor at 1.0 kHz for a total +bxdre(9+hi irg ) phboi 3,x;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 capacit .-c7nr/inru2o5 axog or at 120 Hz. What is the phase ann g urxno72/5r.aci o-gle?

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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, v p:vs9.2aect 20-mH coil, and 1.0-mF capacitor are connected in s2v s9c tap:v.eeries?

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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 z16d uroi:v5f:fktj ho pg771resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz pow gf5h 17u:jfdotzi7kp6vr: 1o er supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of +m-,( y kbjug4y:mrde capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. W: b+jk u,yrmm(ed-4gyhat 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 seri1ii/ufh bec-z k7dy0f9ck 85z b 7gnp8es RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H induct/ f58p yuk-8 fk dn10gzzieb i7cb97hcor, 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 necessary in series with a 500-W resistor for a phasv vuo.g7,vru2dk y.3w e angle of,rkdv.v7 3gy2 uuo.vw $40^{\circ}$ 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) 6dia6czw: honf0td4 mF. At what frequency should the circuit be driven in order tot0hoa46i )ndc z: wdf6 have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15.0 W a7b, zp,l1 waninductive reactance, and 10.0 W capacitive reactance, when the circuit is connectedn,1w7,b paal z 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 naey n.ga-anu 6(72zxcircuit 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 og)dnjs3l6+f e3 tm* cresistance of 30 W. What is the power fn j3)6+ d3f ecs*tmgloactor?

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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 10:gjjc,vjznrk6 m.pcircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz pow 6mnkv,j cj. r0jpzg:1er 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 anxl c v(5enmgwoj(p+ +;mm *4edd a 15-mH coil in series?ecl;w4vnmmx+( ej+(g o d*5pm

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for2+icm o b* h-kgf.e )yqcmd4x; a resonant frequhx.yfmcgbe;* kmc4 +odq-) 2iency of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is nee0wh5ko ysqt,1ded in series with a 3.7-mH inductor for a resonant frequency of 0 y,h wt51qsok1000 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 muq9kkizsb 24n( st be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circubn( z2q9skk i4it is to be 1000 Hz?

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