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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 e)i; c0 ymel/+hm3(gox.ek)-ugndsui xcept

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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 hminm hvpp7.t9-b hh.yh9g 6 32jga7k 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 producer)o qe b6)xc2n3ibzp(s. ,lp4 jgg+u os what kind of change on the in2ino 4, e3.q zx ) rs)gupb(po+jg6lbcduced $emf$, 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 th uzx(3*b+ i*c/nzgfdsit3 s; trough a loop of wire produces what kind*xtb3 +gi t zz*c;/3dns sui(f of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change 2r7i 0k64ugun helksxnji5 + 4on the induced 5rknns e4g40 6klu7h2+ix uj i$emf$, 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 wc x;l(dw,i dgv06qp;c+rk9van $emf$ 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 t+e1pxb8n,i (qy)* xfqpfrd/ conductor will be that which tends to produce which x 1rf/ 8qt(i, ydxpbe+n)pfq*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 horizont /te g06 m4kiuxw,*u djm7y*gbal table. A bar magnet is held above its center with its north e*4 di wxtb,m 7u*6/ygumjkg0 pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magne1sec f5j .g(pyt is held above its center with its north pole pointing down, and rg.s5 e1 yjcpf(eleased. 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 vx vwo )b,sq*e:ector points straight up. The magnetic field vanishes suddenly. When viewed from above, what w:bs v,e )*xoqis 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 gt4qcm , 073clr wdlb5 wo,wl*.jpxg 3a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewe0 wr7dm4wlol,gbg 53txlq cj3*pw c, .d 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 top in a region where the magnetic fieldnbkbn s z0.7i;e+.. z-9hrt5x i8:pnq rmrspv poi7nzr0iqxb95r p mpvs8rs ;. kht bz+n:n.e-.ints straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasin)6+qq(*sj.uf tra aawg current northward. Two coils of wire wa.+ar(uqta*j 6fsq )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 o4j)sh 47 5c) q3kee htrdz(rtf slyc, cz*l;/df wire with the north pole entering first. As the north pole enters the wire, the induced current wi3 lde s rcs/)h)eytd(t 4l5z,rhk; cc74q j*zfll 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 iv (1xjs0vgnnhr/.u r (crrc1p9 *rp6 vs rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be(1(1c nrn *g0hrx9vrvc /s6vpu .prjr 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 wvt6 q/kqr// u xw1oo7zire is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down,k//qqr1 ow7u/6vxtz o 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.1t1s9z0*mqela +fhuz . to fb/
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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 tyiux4 ;a j+a, i0b m9v(vkgq.uhat 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. . epblk;ss8v-/rqpf : 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 direction) id+x6qvg t.hb.s v,tn* s moved northward at consn.vtgd+v6x h *qts.,btant velocity through a magnetic field 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 consta fmp gsch6m q. bxv(/raw(0e)3: or.unnt 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 transfq.1f+o 6f+fw padh3 k2gn- idlorms

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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 throuwp9n+vob) rn/g6:m 5 . kmwnlogh 60 revolutions each second. The frequency of tho56:rgo nmlkwwv p). m+nb9/n e $emf$ 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 t -phe.5i :caito

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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 devf-/75yz6wmm 1zhq lptpo i3+t1c x;bpice 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 contains0l:/pwq, frw(kz -wmtqzoy* 3 more loops than the primary coil p, zykmr ozw*-f l/0qq3wtw:( 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 zg5 ggh;zv*, uq7dd x4coil contains more loops than the secondary coil then it is a*4hd5d gx zg,g;v7 zqu

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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 po hkwk.oam 3o w+9k.a+fwer 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 resonam -yz sj-8rcsft1cqx8 6 ;q+otnt 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 connectevfhzjwas j0 *s:8vyg6xo23(e)uv5 omd in series to an ideal battery of constant terminal voltage. At the moment contact is mado)x 5ajhs zs 80*g (juyvmv2v36ew :ofe 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 indaq1sgdurq0 lo ym j44)/of 7-iuctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the vol0fodu/gq qim)l 4j7ao 14-yrstage 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 resistance R ioo91; h/lyltrajduw4rh4 / i. s 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 resist7o6 vfmtkp17p ance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a batte sjaik0p;grpb0 q4kd ndv*934ry. The time constant for kab*rjq pd gns44i ;30d9vp0kthe 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 inducnr5* iey61-lrt mo6 wztor are connected in series to a battery. The battery is suddenly removed from the ct ro16m-eny *il5zw r6ircuit. 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 same units nckela6l2/0aw5.qkzib m0wk5 x 2b )e 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 ci h6p+v,,ot:hdxyf;xj rcuit, 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 conner h5 wi-,7tqulcted to an AC power supply. In this circuit, the currentq 75ulri ht,-w

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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 .xrp: v mj(fkh)d ;e1cchanges by what factor when the frequency is tr :(jerhf;vcpx). mkd1 ipled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the inducb 3y)u tfve(du 0urtbs5h7 .h9tive reactancbb0 53(r hsudu)th fyt97e.vue 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 t n),mcs.uh-shzakwnb; (yi7 3wkz :a(he AC voltage across an inductor approaches zero, the inductive reactance of that .bm ,3z)-n w;a(nckhwhkaz si (u:s7 ycoil

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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 circuit, the2nfo) (jt dgy:i18xd y curreno2d8yni1 :fx (g) jdtyt

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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 q4 s5u4ykgf j)j1 xo5zby what factor when the frequency is triplekgjyoq1 juf45zsx5 4)d?

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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 ap .m (egx egk 99rdx/u)2yx7pmnproaches zero, the capacitive reactance of that capa(p9n)e/m7xd e9 m.r2 xykxggucitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor * 4j8imh,j t3sysn3 d2st t6+st2dc tjin a Rs2cid4hmsty,6 3t 3 s st+tnt2d*jj8 jLC 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 as w /d d3ep)fk3zjqcj35$\cos M = R/Z$, 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 impe8,9. i*cok.wcr bgocr p/as)g jj28eadance of the circuit increases if R increases. When ijio cj.8eog/as r b*ar8k.9,gc p w2)cs 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 circuit. The im):+:d q. tiwo ne5uvzx*rizvwd u)o57pedance 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 yx*ppp :v3ij.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 bot uvsomuc* 5(2nfso + 7a(4asjth double in an LRC series circuit, the resonant fre * vcjs5u+au ast2(nfm7s4o(oquency 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 resonance fr-3 ,.q(ek/fneosoouv ;;yd,

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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 occ -j egr-,b)hpxurs 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 l3sh mhcgo e tk6i0+9g8 x2ya-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 fielkos + -62m ty8hgchgla93i0exd 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 radi d a+f ql7;p:c-rgabk.us 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 mag-a .l:7a+pk;bq frgc dnetic 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 at0*; tgug..)dc tzxcd uniform magnetic field of 0.20 T. Find the magnetic flux through the loop dx )ztc0d;c ggut. .*twhen the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single 98iz g/vji mq+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 co1n.b vtb x)tf,il changes 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 si0k 8gh9y.s; io9i aduddes 18 cm. A uniform magnetic field is applied perpendicular to the plane of theiisd9 g;yhka d. o09u8 coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire wie( 0,o t.bproja)g +r0ay )ulfth 15 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 and aace9;0f z/wwyncf.eo6z ; u0 yrea $0.20 \; m^{2}$ 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 6)kmpqjmv m5v (g1b :rati 2*8m0 m flies horizontally at a location where the downward coj*gvmr )m qkpm (581: tmiv2abmponent of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a coa mpl*v)w 159c nuga:-lvvp/knstant angular velocity of 2.l)1cvlvw9vn / gp p5 m*:akua-0 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 a +o;x8e, de9qeotlr4 hnd a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns oo7pr5qn uy2 c-r ue--;c cdc+8b6mmx ef 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 recym;nh2b0i b 0dtangular 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 0dhyi2bn b;0m magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of (ym2 y,i h6yov j85spkarea $0.090 \; m^{2}$ 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 wi /f*co h09qcx;rwq(g( +rfq /fwbqt*vth an output of 12 V maximum when rotated at 60 Hz. A mvoh f0cq (gt cq* (frw/9frqwq +x/;b*agnetic 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 gened.- 8 g(x 9ptry(tllyurator 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 6.00k l :lf8l/qtpjcu6lc,10 eb-.vj v4tw W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor mipbv+7e wq8/p8k rr0a *;88b clwiyvhave a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed i *bmr8vr wppc iyv;88a l/wkb8 e+0iq7t 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 power suppdi: v *w1bcjjlpc4;6 o*ka9 yoly. The operating current is 1.0 A. What is the start-up cuoly;pj:aic*k j4w*bd 9oc6 v1rrent?

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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 resistancec:-dejr1x3( w,bh ql z 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A (zl,-qc 3:wrjb1d hex 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 internaufvxl-styb9ba pd00 a7qpt -+ qy2.800thsjy l resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back0 2bfutahp0l-7qtqv 8ybj s 00.d+t9 axs yy-p $emf$ 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 n nmhl, z8w06dveeded to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in thezx 36)j b*l9u)mh /wwi9bzdae 7ekfp0 secondary. How many turns are in tl9bk /we 7 ))pxfzejad3 m0*zb6ih9uwhe 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 necesxok s5i jrps+2on4a4jb z ;(9ssary in a 110-V primary if the 24-V secondary has 1004o+ i9ss2 orj xzs;p4n(bj 5ak 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 2000-turn s6ah2jld qg 5s*econdary coil. If tqdj5a 6h s2gl*he current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% efficien0/7gaf 3r/kzp+xx j 2p4dikwscy, how many amps at 24 V canrkkfx0pj2+4 z / 3/ xipgadsw7 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 providesf4 d s.j g1pizdiu)cal6/6hdg+r ,u:a 7500 V at 10.0 mA. The primary coil operates on 120 V. What 1auigrs+ .uhpdg d,6 /cdal4zf)j :6i 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 300 turns on its ser04c7zpr hk )-tgw7wc condary coil. If rw0thz) 7 gkpc7-rw4 c120 V at 2.0 A is applied 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 u0mi*ua gxfo)34lg m/its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied tmfmo3 g*)0ila uxgu/4o 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 transformer has 100 turns and its secojkged-: b3n (sndary has 200 turns. If the input current at the prins -3k:degj(bmary 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 secondary has 200 turns.lssdzk 1g6/q yo0 yk)* If the input voltage to the primary is 100 V, we can e o6/gdslzsq)ykk 10y*xpect 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 turnsvpa-aztn8mp q- c:s32 . If the power input to the primary is 100 W, we can expect the power output of the secondary tot32nmap 8p: zsv c--qa 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 126pzx-ehp w :l4y2evv+ o.+-l8x zvaoe0 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistanc6ea:pp2x.- e+ zz -lo4e +vv8vw lohxye 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually u1**juxcp)x ;ro i7 l suz64tmstepped up to 4500 V by a transformer and transmitted t;xoi4 mutpu1r) 6l*xs7 z*cjuhrough a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V.kgz5p wmm8 f)b0toz nm3 8;cl- The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance)p -f8wom lmmz8nctkz b350 g; 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 0.60 W./o qlgj (r *pk*c7730ix npst9m7looc 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 *lcpi7gsl(n poo7 ctjoqxm0*97 kr 3/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 509*tzb8nmsoe ) km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a*o mt8z)9eb sn turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power wouldk2(dk)q0xf jb z 2zop1 be lost if the power were transmitted at 3000 V instead of at b 1dxz20)k( zqkofjp21000 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 iu.g r5m -,entls 440 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 transformer if the power loss in transmission is not to exceed 5,lmugre -.t n0.010% 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 stoxwn: l1f ze+z2red in the coil's magnetic fiel:n+zz 2fwe l1xd?

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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 contains8m o (4/px ;kwjz:mr 6- (pjmhev2hhji a 6.0-W resistor and an 18-H inductor. What is this circuit's8zm vp-oj: h(jimr j(kpxhm2; hw4/6e 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 uwfa0*29pne8uw5 i se in an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the pe(0ct .f7 lad1b cjsao8ak 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. Whatbh0n0*, *jbnm ydf, fh is the resistance of the lamp?yf*0,nfjh , 0bd*nm hb

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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.d wuta6061ixsc eimt8.*3f y s What is the peak current through the resistocw* 6ts6 .y0a fx3ustm18ei idr?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply /x1sulpcodjlra)g-:8 q21sby 7. pdb. What is the power dissipated in the reg8 sb1-27 d:poyu x.ablcdqp/jsr 1)lsistor?

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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 e /;du6( 30ovmy ud nmho27ksg50-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 50-W resistor isb/d5.ypn) jma ab5-d w $I = 0.80 \sin (240 t)$. 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 resistor iydb -5to8*v eu74mjn8u q 9tyfs $I = 0.80 \sin (240 t)$. 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 at 60 Hznmlc44 eku-b+,2j:lf4 urhc kj zdx--?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1000k v 9v8l.7dp0apr gbj: 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-md 5i4uv : ,vvyb-lf-aeH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inducticvsulysk2g 1;f ;/h9 n)dm5uzve 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- yfnwa m37 f7vkjs9n:+k9cze gid 6y+2mH inductor when 120 V AC at a frequency of 20 kHz is applied nk7f: +i e3 yc29 w796k gvd+fsmjzynato 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 2ox*zq e0m q,o0.50-mH coil due to a 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 reactancn: 9vlq-;flm oe 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 capacitixizd7 w75 /ezuve 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 g:my;m51 wmrl have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor bez( 2mq)ff.c4o/xjxc s 100 W?ox ff cqcxm2szj)/(4.

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 5. .p) tfg7;0qdgjvs0dr 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, 15.0 W i 96ymljqcwvki 2rw xc(-/8g 0x/uav2enductive reactance, and 10.0 W capacitive reactance? - 86wqvlk y rjwe/c29(xmx2/0vaguic

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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 at5(srwx 0ca 8 tl0fyvk,zted +( 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connec+etw5sr8((y az v0dxclk ,ft0ted 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 a4k r+-iec8ta nt 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriesae-+knt i4r c8?

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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 i-apl5 yqst8 ql*9rf3n m ;rwa/nductor, what is the impedance at 109ql5- r at8*wmyrfasql p;n/ 300 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 connecte3mjuc 18qv*9 zzvx yo68n1yzw d in series with a 20-mH inductor, what is the phase angle at 1000 qxy6zm 93*8 nzovvzjw 1 1yc8uHz?

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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 ci 2vah(xu +ql1prcuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W atq(+l21 huaxvp 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 capac4ui3rz56fzagn ( zy x(itances is needed in series with a 100-W resistor and 15- zy(n54(u63xaizrzgfmH 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 umqw :k e77 /lmt08ltiseries with a 450-mH inductor at 5000 Hz for a total impedantq/0 :umimk877le twlce of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1 x2o n6qa5b6eb.0-MHz for a total impedance of6xbbq o6ea5n2 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is xd,b+v+ 0x .en(d1 al lhkaxt.the impedance at 1000 H0vt.,xlnlxea d d(x1+hb+ a.kz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz f8i pk2,du7h fwor a total impedancehf7wu2k,d i8 p 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 wituab9xbc2s n2 ,h a 10-mF capacitor at 1.0 kHz for a phase x anbs2bu9c,2 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-W resdgyrw uy-(46q pkj1/hm:3 on oistor at 1.0 kHz for a total impedance of :ohgdk3p61y/nrow4 qju- (my 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 serie/tb3y0mr j9,jug 6iso+c sr3 os with a 100-mF capacitor at 120 Hz. What is the phajc6u ,sg it+ ob0ojrr33yms9/se angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and))fz 7xsis(j*q q rdr0 1.0-mF capacitor are connected in szi qr sq)sxrj0(*d) 7feries?

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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 resistoz201 qw:w7hcpvzr ju:0 xr0ddr, a 10.0-mF capacitor, and a 0.3 hd1p j00u:vz7rr wc d2q:wx0z50-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitornqig65x qw2b+ of capacitive reactance 30 W, and an inductor of inductive reactance 6g in+x w5qbq230 W are connected in series to a 110-V, 60-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 RL2.r1ip0l;scpey9ck y4bpqt n.2 ,i to C circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inducto ipelr ,. 4oqtk91pncyy20t;c ibsp 2.r, 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 aqw*w.+o h8s ob9u x-pphase angle ofu-aqohs x .w 8ow*p9+b $40^{\circ}$ 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. A krwn b 9-:h2 zcx;rhmj.b+5hht what frequency should the circuit be driven in:k ;+bxbnhhcm59hjr-r2wz .h order to 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 outputqyav 6/8 ;c,;-n njrroww p.:0wpbd vq in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 qbvwpov p6 .na r nw:,/r-; wdq8;yjc0W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of andnq ry:j+ 1770gdpihg AC circuit 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 impetw) vnyzt e/e5 mi8/z6dance of 60 W and a resistance of 30 W. What is the powy/z)5eie/t tm v8wzn6 er factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W resist;ef6, wsek+g pq;ttu 6/xdvh)or, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz;fedp+qs, ;wt/ 66kxeh)ug vt power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor hwzv1e5 ig,( e+2guwband a 15-mH coil in series?,uw2e51+iv(h zeg wgb

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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 serie6wbd2 8hskk ano))xj-.u ijv,) 6ubwvs with a 4.7-mF capacitor for a resonant frequensdh)wa-v6.o6 j vw, uj inb)2u)k b8xkcy 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 nenym8 ug0c .13vkx)a t+xvys, ueded in series with a 3.7-mH inductor for a resonant frequency tucv axx13)0vuys k8g.+,ny mof 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 resistor and a 40-,ljaw4(i k+1e jsxh+ cmH coil if the reso 1jxw hkes ajci(,4+l+nant frequency of the circuit is to be 1000 Hz?

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