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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following ar2bo3p 736qt 5 ayi)5 crmwlvjve 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 states whh6pizp h. v-/*puks /ezwfm 5:i0v3 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 change on qrhi-zaf t/ )f6fz*s.pn 5) jvthvfj -q /stzff z*6iap.5rh)) ne induced $emf$, 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 fop7b: *n*yy9vq;bxgyxgj: c:wj gm(+23d kf produces what kind of change2g *g(nbdj9wkcxxp fm3:bf+ :yvyj :;7y*oq g 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 diameter4v /s ;;p.sybnef lh;k of a loop of wire produces what kind of change on the induceds sklb ;p; .n;h/y4efv $emf$, 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 magty9bg cocc pk x5 z)h 0,6x7s,8hca*kznetic field 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 a.l1r 6 fw.bonnn induced current in a conductor will be that which tends to pw6 n .of.lr1bnroduce 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 horizjwkun/tuv hl0 3c( )5hontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed fromuh( kh v/0wcn)l5 jut3 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 hbi7mj2br6 r5 ecb .l7uorizontal table. A bar magnet is held above its center with its north pole pointing down, arum27bb7b.5jlecri 6 nd 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 v x: ym/gr97belrav pl,4 9t)qtable top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of tl7 re/ymb9gt qx,9:vpr a4l)vhe 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 tabl4b-yaqb-ohht(h*8ix r lsq0 2e top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed fromqla( bhy4hi0q2shbt*- x-8ro 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 xm m nm/pf4(e07vqmu- magnetic field pointsq- m xepm(mnuv 4fm70/ 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-increaskdmmr83 a57:5t4glers3z mprglp y26ing current northward. Two coils of wire lie flat on the table, one on either srmar8 pys 5zgpgr teldk53l4m6273 m:ide 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 pole bnq0 kdhxm88:ey.y 7s entering first. As thhy.x8yb 0nsq7k edm:8 e north pole enters the 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 rotrtpcm wh1t; . gtw4m(qck43dpeb 0. ,yated 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 the orientation of thwttt0y.4q h1 b(3ce4mpkrp, m;wc gd.e 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 cowy xubhv69 k)(nstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of thev x 6u(kwy)b9h 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.6) nv3wtbpx7c
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that an e +;(zn*hx6. awsw ep/qhxaf0 $emf$ 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 fieldz0cg a26kl j r3)(xnh:. rj7)tlhkrql. 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) is moved northward ap03n ff8 lar)iw+-cuue sduw q:,,n8q t constant velocity through a magnetic field that points straight down. Ma ,rqp+e)8 0ni cf-ln uswfd,au8:u q3wke 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 ) :7+ctwflywd constant 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 transformgf9 npimiag*l4 km/:2aqqy;-s

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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 reh i/ n1p1n79uk hnll8gvolutions each second. The frequency of thenhhl/lug8i 1kpn791n $emf$ 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 tgg 1 mngo))js5o

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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 deviceozyjtno+r/t8d8 ;l( z1t:crl 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,s-y*p*)msqekjricv2 2o k7 a secondary coil contains more loops than the primary coil then it )io* s-a7qr2y,vk2ckj*e pms 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 coil contains more loops than the se;y /2h7v klmlf4op;yqcondary coil then it ih47o ; lyvqmyl p2;/fks 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 inpu7dyzs2alw) * rs/dq+v t

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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*.9waf5l: rrj ql (kiu,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of cvqqh3c0hh qm *5;js;nonstantvhn q03h*5mq ;cj;hqs terminal voltage. 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 inductpt6z(e 3qltf73yfvm(or are connected in series to an ideal battery of constant terminal voltage. At the 6m3f ty3 f el(pqvz(7tmoment 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 resisf9+4mhy p gxlje,+ aw4tance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected n 48quuwjc.z ;6t8ssa 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 sez:a3;kr gp:iy4bxo2tb 1 j ;h1qpwb9pries to a battery. The time constant for the circuit represents the time required for the p4: ;1:hy3zwr1gapbo2j bkb ;p9it qxcurrent 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-z3b:oew9r 54 v t dh0m4zu)ceusx+io a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time requu o 9xiwz-cme50r)4 sve+b d3hut4:zo ired 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 sbq4i,4 h ygid;ame 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 sup9 9guq jbo7lc9ply. 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 con-10x s *(cubbd+yz7 tbotp u;tnected to an AC power supply. In this circuit, the curren+-t*0sozt1c yt (;ud bpbx7u bt

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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 ts d.v, e0uffur:wt )r1p3s;ywhe frequency is tripledr01wyw3u fu.: vr dest) ,sp;f?

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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 doubb 3-lc zmna30f)i;hlcled, the inductive c-) c iaz3nhf ;mll30breactance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, the inducqagr(09 fsas *tive reactance of thaag0* 9rq( sfsat 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 supl yyj,xard)t,v (:+h vply. In this circuit, the curre) tdv a,yrx+:hy(v,lj nt

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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 cibers;h9d4pjypw :3 /e) ts8avy7gqs, f 5xg3brcuit changes by what factor when the frequency b5)xb7p/ h;:dwys9ergspg3 t 4y qajs 83,vef is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the capa-f34a( h;g 8 n)ofx b)zhqafzvcitive reactance of that capacit 8 z3hg)z-xf ob(;)fa 4naqfvhor

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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 in a r*ma:*; rbxlkRLC series rlb*m ;*:rakx 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 circuiivhbcj y*0 q3i5aw*hz-2 m -kvt 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 y 5pme6 5lzb2le+x 00xsdfqrt3-ti2eif R increases. When is this statet35y ebsx2mz idt5epfl062exlqr0 +-ment 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. T 8v4pt5mwqct im0dl0s -w 5(gohe 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 increases i/p6nlk h6 byq yi.00noaf,8gkf $X_C$ 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 sy.4cujh.g0h geries circuit, the resonant frequency of that g4 yh .cu.0ghjcircuit 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 au2j:j iq6uiq4n AC 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 occ9(pga*yk a.o rurs 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 magnetgwt3 jpav(+5t l*/losic field of 0.20tg3/ap l t(o5s+*vlwj T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating sb zd+ 7glhy4iri1to)ed1t/ 6 in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpe4bd6is71)g1ld/h erit o +ytzndicular.

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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 ra xm.ipq8dqu*z;( af ,pdius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop xa fq 8i (pu;mqp.d,*zwhen 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 n;/zdyxt pk3g+..q hten /h:hh)kxx0an 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 qkc wg58h6j**g l ,dlochanges 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 .8a-ikqb* ; uhs6o5qi0 c,6wf fzzmiuwire on a square frame with sides 18 cm. A uniform magneti6fm hoc0;u.q86u f zi-b5i i z,awq*ksc field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the 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 t)q-i)fyiy fp;ae,,a jpb)0fwith 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 area2k *9 5wcu1 dgclgxo0t $0.20 \; m^{2}$ 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 60sx2v)vq(ou:6qg 0dv d4 e4qec m flies horizontally at a location where the downward comp4 d(4qdq 0vo qxeec)sv6g: 2uvonent 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 n : h6;d a k1.qlj(ta9kdlvr*gconstant angular velocity of 2.0 rad/s about a verqdtl n1 a 9vgkrh.lj; 6adk*(:tical 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 jzc 6;-ojf-38 tiu 5p vu4x9;a sidshucross-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 tu hp8r10hu jo9arns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is 12fa;uo mfe 3 vm.e6+d*ao7 zld( cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendiofm(udvaea7+. o;*6 mzl3d fe cular 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 1vygj vy0tt 9pd7(y9(t0x 0tyn00 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 cwbea+m215ap,t p2b76o swdv vonstruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic ppv we17aa25+ 6wmbdbvs 2,t ofield 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 rum*w 4c3 zk tu7txr2/generator 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 n73/pjdgfe9, 4roe lu motor 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 motor have a resistance of 6.00 W. Tjaw8s.j ae2u9) w+; o orzzic,he motor operates on 120 V )z2j;+wrjioza .s ec,uw9oa8 AC, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resis l jm(p2drmhd9 q;o e7nemv68*tance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What8( dve*qmm62le7 p9 ;drojhnm is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V pow9m4w)5c4 mq4c fthf h jy7tc7xer supply. The operating current is 1.0 A at full speed. What w4ch) q c4t jhc7mt4x9 7mfy5fis the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-gl)z v*sb z8.kV power supply. The operating current is 1.0 A at full speed. What szv 8)*g zkl.bis 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 ghw iux+r*81 ilkqd-ao466affr w m) +is needed 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 the seconb4-jo d71jnl- so ku9xdary. How many-7jdno9 j4bu-osk l1x 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 a 110-V primary if the 24-V kprr5gbwf2+* rpd0uu gnc(.u d:p8 rd e+ q)b5secn8pwq 0u (gubbrc.k*2+r)5ud 5gd:fp r ep dr+ondary 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-turn primary coil and a 2000-turn secon fn/;xl9bz mwnm mop)27ix61y dary coil. If the current in the secondary is 3.0 A, what is the current in the primar62m97nw)zf1p/nlx bmmy xio;y?

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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. Assumay*hvp6s73 sping 100% efficiency, how many amp* ay6vs sph73ps 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 trans*ge5 pv (,x2zgljx s/sformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary dra lsxvg*g/zp5j e (,s2xw?

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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 5/tx2m ,lhdooturns on its secondary coil. If 120 Vlt dm/,oo52 hx 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 tc,f9q s-mdb7lurns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied- fs97,b cmqld to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turnmf6)zz 5bol5 n*vo(vfm 7/jpg s and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secoo ogv6m7pb(j*zm5/ 5vlf)nzfndary 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 y8a5j moyf33j turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secj 5o afyj338ymondary 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 transc)a9if5)u v5zy x/o 5ta(re arformer has 100 turns and its secondary has 200 turns. If the power input to the primar)oia(x5tuy vra)f5 ze 5ar c9/y 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 isnxc ( 5rz rl:pzj 11yq25s9xcurrent at 120 V. The voltage is usually stepped up to 4500 V brn5qxzs(j c:1295 ylprx iz1sy a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 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 id09 ,neyw xh+grc)l ob9, q8a120 V. The voltage is usually stepped up to 4500 V by dab9iw)ho0 rq8y n9gx,ec,+ la transformer and transmitted through 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. The voltage is usu5nthbwatbp6+: .)wvue 4 wd5cally stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not steppedtcbut 54 )p5wb+wwn6aehv :.d 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 resis iop89 d-7vgdrtance 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 stev9 io7g-8pddr pped 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 gen2y* d u1v9qjf-qt3ckke ykx 8;erator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, t 9k82c3;e1yvq* x j kqkt-dfuyhe voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-Wdu w5-flf ;u1idn* +fw line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V insteadduudw+lw* f1-f5i; nf of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a linxjh) ,;2e8tg/y*7q z; se1 rnsijbi ale with resistance of 0.60 W. To what voltax * y,tsig j 2rhn/s7a;zq)8lbi1ee;jge must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energ:jmo +r)ha/ vpy is stored in the coiljrm/+o:avp h)'s magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a i,kz+ fqwg(r)6.0-W resistor and an 18-H inductor. What is this circuit+g,)fi qrwz k('s time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rrnq 2vl7s)y fk42f hf4ms 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 tdc3mbp.w ; vu*he 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 in(*xu. y.djyc9/ms 8xk(dik dito a 120-V AC outlet. What is the resistance of the lampmxy8. d(jk*c9d .iyd /uixks( ?

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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 the peabr-mkc ,9qn ;zk current through the resi,bq z m;rk-n9cstor?

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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 toyp k2el:3 vov3gc) *jt a 120-V ac power supply. What is the power dissipated in the resistor?to3v vyl2)k:gpecj* 3

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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 resisto eghs1/dz6u/i0nc.b zr 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 respdxx)bsqx9emrx q - do; 0-oh7 rc;5m1istor 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 resistor ibd-hl -sf ri:fa: i6;cs $I = 0.80 \sin (240 t)$. 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 60kpfk8q),4) ueqzum1w6ow, an 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 inductive4tan)5 rb /bu 2g1jev 34dldva reactance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have rfb(:k:e3 g utvde0 ;uzmwm7 /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 necessbq)n3hksz mrl p -sb,n;j /s5)ary for 157 W of inductive 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 frequok2) 80 z xgnq/2ggl +yunklm1ency of 20 kHz isu1 )lqggn28k2 +xokmnz/ lgy0 applied 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 sourcembu rd:ga lj3w+:4xwz :+shaw/r6 y7j?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor ats*m4j2cad b0 d-a gsx2 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 reactanctc meu4 zr29-ve 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 reactance of 1200 /ws;gw.ts /9z e0mjex-pzo1vW?

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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 reacy *nck9 w2y,hfvw*t :ftance of a 0.010-mF capacitor be 100 Wh2w:9w,yc*n k *ftfvy?

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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 0.001bp 8rcy* -dxo(x/+ozpyh rc(*0-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 o)cnwi n87nuc9f an ac series circuit with 12.0 W resistance, 15.0 W inductive98niwn7 c u)cn reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 2a/ xuvnp.f00d 0-mH coil, and 1.0-mF capacitor are cfv0. 0danx /uponnected 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, 20-mH cjs+ye 6;*r crboil, and 1.0-mF capacitor are connected in serier;cbryes6 j+* s?

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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 sl03*t+8fvla7a bd vybr:js 7 aeries with a 20-mH inductor, what is the imped0vy 7:3 7bajadav s*t8bf l+lrance 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 wj 7++wfns7:fh2phuek 8 * bxt k*hf9gf-mtvt+ith a 20-mH inductor, what is the phasf 8++9e72 bfxt-tvj7uk*nw sh:phf+kt m f*h ge 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 needey)/kvw2b/qk t squm))d in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W2/m kubk/)))tv qyqws at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-2da5zmcc gbu;68 iw)k W resistor and 15-mH coil tg bd;cu 5iwac)6 z8km2o get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor fe vab4i6r5e3*j gwf+ at 5000 Hz for a total impejg va3b64i5 e*w+ fefrdance 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 k/ gie*kr) bh q,2hgnz2hm.i*put in series with a 100-kW resistor at 1.0-MHz for a total impedance of 150 kW2 kgnzh,r2) *ghh./i e *qbimk?

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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 2*u s*wc9+c h 5ngbhkn10-mF capacitor. What is the impedance at 1000 Hsw*5huchkg 1n b9+c*nz?

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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 seri)n09 pr2wuo mk ddhmgi ci62;0es with a 10-mF capacitor at 1.0 kHz for a total impedance of 45 W?)dkup m i mwn6igcdr209 o;20h

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for aiga4 fc02 rgq/ phase agr/ a02qc4 gfingle 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 resisl7t0bzh2iqge 6: xv* gdq28 mztor at 1.0 kHz for a total impedam6gtlb0*:x7z2g eid2 h z8v qqnce 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 p:yicc jlakd : *33ix+daanf7 3 +d)q1uuaeg,at 120 Hz. What is the phase angl7c a:1c ux 3n* k3j+qd dga+u3lady),f e:piiae?

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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 1500s(z lmk4* o6t9zjlw qj4+luvr( 3pe8m Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in (o4svpl jl9ql( 6wzm4jkr+3tu*e 8zm series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a ko7epf93b t8:eld7a x 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circu7d axtb9kefe38o l 7:pit?

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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, addxks rebx vcr9 ya..3xv7c +)d8*g.f capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 d39ag cr7x8ykr bxdfd sc+vv.. )*ex.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 RLC circuit containi*vt3 kx ,:zf0bj8hq ufng a 50-W resistor, a 10-mF j3f :h8utbz*0 xkfq, vcapacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary i, izlo om82axz(k75mwn series with a 500-W resistor for a phase angle of m8xilom k7, 5zzw(2ao$40^{\circ}$ 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 nv+-pd3,f -rhuxio+y , L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have dhfi3-v+u-n,rox + pymaximum 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. uwn0pne 51iplcm7j7 n+ p)a4v0 W inductive reactance, and 10.0 W capacitive reactance, w p)jn5 l mun+p4wpn77iv 10acehen the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit istozimsu+;6zv/ b 3e4g $63^{\circ}$. 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 rexdx;m5fxe ;3p md :pp ilm+3,vsistance of 30 W. What is the pom 3d xx+pl p5md ;ef:3vip;,xmwer 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 fogls4 myi /0 )ztgl0;f68zpvyar a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, /l yg6zy)mt0fpa4z lv; s0gi8and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coia ) 7;-e:gh5 sbujwqinl in series?7he nasu5q- :bwg;ij )

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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 for a resonant freq8 yj7 mio5n+qouency of 10 k+8 nqimj5o y7oHz?

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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 inductef/xfa1 )+5o1mwf aoaor for a resonant frequency ofw a51axfemo1o/f)af+ 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-Wiq) /e9 o* q4dcv5dzca resistor and a 40-mH coil if the resonant frequencyde59viq)z/ a co4*cdq of the circuit is to be 1000 Hz?

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