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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: 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 9e3 by+c)zz a1tjd ;hwmagnetic 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 that th/ x12tor:gq(1bo :w.jdlm xv he $emf$ 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 x b.i*v apk)ju-4k .tfub15rxhange on tk 4)r*xb-5vkb1pt x.ufj au.ihe 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 +2t-ne/ b/tks7x qki bmagnetic field through a loop of wire produces what kindqkb-7s 2e+ixttk n/b/ 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 of1n9g fbjgx/ 3t wire produces what kind of change on the induc 91f3t gngjxb/ed $emf$, 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 rxhy5(*e 9ftd magnetic 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 an induced current in a conductor w(6j: ,oi8yxswyc g1liill be that which tends to pro col,:iy1 ij(8gs6y xwduce 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.bo, (uu )x el,9cr3rw)gx8yo n A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from aboy(o orlb)3gx9ue r,wn ,)x8ucve)

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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 isxdm 7 -9;9sgdjvd;ch csf0d -d held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet ijds dd;9s f;- 9mc -0dhg7xcdvnduces (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)6 yy;c,i(u*cvfr vdv region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field f 6r vv*c(uvy, ;cydi)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 tofs.vx;/7 lhr kp in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil a hl;srfv.x7/k s 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 2-m1ni+u zhl; bih olux 3;a,1cxiqo)the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the dirca3uhbixq mxoll; -1 )h+ ,iz; iuon12ection 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-increasing (*jw niq8gz gn2ele(;current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from8ien2w j* ;z( g(qleng 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. A.g8vafym5 x j3cwgbu3qk c;;o fg;/wt+ ;x 0wos tqf5 uw;tg3gvg 3; kb.; x/wof xwcymo0 j+a;8che 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 rotated at constant angular speed about an ax) m 9kdvdrg7hm9 q,cd4is whose direction can be varied. In a region where a uniform magne9d , kgv)d74cmmqd h9rtic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotah 4lkyz bzjqhyj..t i* mhj8u +3hg*5-ted 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 orie*zyu b h8gjqz lkjh5m+y3.h4h.-* jtintation 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.+ 7wr78hc+l;ksyqj zc
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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 1adv eg5r4 slb 7k;9dran $emf$ 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. x db07)f)fyc t *+ cqdjp2dup,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 direct3x-r7d)3jruu-fpm.n jbr m/ :msm c3z ion) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerm) :mrz-mfj 3u/ 3d.rr- cxs7n3bj mupning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular velocavi6fuo9oka7eigxt: )87 6 bk,omav/ ity $\omega$ 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 transformskrf5.3seacg g-dhpb 3fm+)w.

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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 throucdi-c c;b+p*ht(0 mohgh 60 revolutions each second. The frequency of the t*p hm co;c-(dh+ibc0$emf$ 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 devq+2 /f.gt edz0h fl zcs7gg1,qice used 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 device)3lg m1tbe k hn0sg/ fgn*3(zg that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains mo )pc;;navk1 b 7jp 1 , :2xca4kcdooagny/t6dnre loops than the primary coil td;aat/k: kocyco1 ;bv4xn)c 6, n1ga jd2pn7 phen 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 coil contains more loops than the secon)/m 7sj0f5,urbh 8yy4i3u8sqsde oa mdary coi4au/b887 e )0qsjsuio ym,y3rmdsh 5fl then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, thet2 qn: x;8fecr power 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 cim b;o ,4qbh0tzp:*kgy qg b-:urcuit,

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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 szb- z)-.a ksbderies to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the redz-zabk.s- b )sistor 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 in 8vzl)wjbxxa:v tq j3c h*a((,ductor are connected in series to an ideal battery of constant terminal voltage. At the moment conta:bht(j*zl)8(x x3jaa vvw, qcct 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 *w;ahr mll2 w;with inductance L and resistance 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 resisi h2j 4, spna5* eim.rjca2,oxtance 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 inducti+* 8p9;nf inavmq-on,qga+ qor are connected in series to a battery. The time constant for the circuit represents the timo; v pn ,aifmnq- qiaq*ng+8+9e required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The battery is*d)u(rxy qye xf ;1 -gwc-ojg9 suddenly removed from the circuit. The time constant for of the circui o;*xy -j gguy(1xc-qe)dw9fr t 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 ay2:ms j a9q:nhave the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circi(2c(*byn h .d;ec pwtuit, 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 pog18gidg0 0h3f;km gj gwer supply. In this circuit, the curren3 dg0f1h8i k0j gg;ggmt

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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 g;pn4jx,p.h7ov,o1mfg 7n fi what factor when the frequency is tripledjvnfg. np;o,1,x74p 7 ofmi hg?

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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, thl+b6te4/gke gnp72qre inductive reactancbe n2l/k46qeggt+p 7r e 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 inductlu1 7r)r odvt3or approaches zero, the inductive reactance of thrt)u r17d 3olvat 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 p eglx:.d m1zy-ower supply. In this circuit, the curren mzdy1 -le.x:gt

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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 w4rfhk5 , 3 *uma1pspckhe ko.4hat factor when the frequency isef14h3aku 4o 5pm.k p crs,hk* tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage acro;( xgob 0piki(ss a capacitor approaches zero, the capacitive reactance of that ok ;ip0g (ix(bcapacitor

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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 inwdbl;1mvngj r n3(o:4 a RLC smo(r gnbvn 43:1 djw;leries 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 ah;x qs- lfbh7l44;) qzzggp6defined 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 ci)g l6 a-d cxgl69dmog7rcuit increases if R increases. When is this statementd6lg7ma 9c- )xoglgd 6 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 impedq 0zf4uti v jr4y2zp93wh 1jc*ance 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 impedanchc *x0vski9f umd;.x9e of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both db1cb).s :o pzvouble in an LRC series circuit, the resonanp:cz.) bo1 bsvt frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven 002a7sqsii qbg 5:pyt by an 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 oh- noop86d12h1ums ocrs j9)h n+lg:eccurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fien x8oy. piqvz9 ;iq5v,ld of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are 8i qnv q.pix9,;y o5vzparallel.

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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 o,tg (7.;w 13sc/y obgstid tyxf 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fiel,t x 3/7t swygc.iy(odgs 1;tbd 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 rotmv ue61r9/bfk ating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the lou 6fekm1/9rvb op 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 loop(f /tgmg(uyh8be* zh + 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 chang,xqo-qui x;5 hr izzx7).e3zces 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 cid5lp4n hrj0jiuw pf--( 2)twire on a square frame with sides 18 cm. A uniform magnetiiwp5r- 2lhf) u ntjij4-cp d(0c 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 with 15 turns and an area oc;qqq) 28y6i6 ivwbki uv+uq/f $0.40 \; m^{2}$ 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 ar .nf,lm b56zxoea $0.20 \; m^{2}$ 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 horizontall.okw x9bhl,p0pwu1ds5h:a awh8 4mo(y at a location where the downward component of the Earth's magn1u4:5bw 9s.m( pwaxdl0, wakoph8hhoetic 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 rotate1 i/np014y bs mevm0bt*ngg78ty l2dm s at a constant angular velocity of 2.0 rad/s about a vertical 1sib en10gm 72p0/8bmm 4*ltn dyvytgaxis 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-sectional ,s/4w jc*nowoarea of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of w:bx :xr1f8za26 ea mqrbd /h,kire 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.2i.vo5 spr+ a,uj;qu ahie +m1 Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm a roh, iuu2sqp. e;j 1aaim++v5bout an axis parallel to the long side. If the loop rotates in a uniform 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 ar918r. u ndhhwuea $0.090 \; m^{2}$ 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 wisftxe57 w.(yv*geqyrr i. k: :jh to construct a simple AC generator with an output of 12 V maximum when rotatefjvrky.g 5 q xw(e::tir7*e.yd at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator wda g+k )a7ty+dith 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 h3 y,r6ryta3lcsr ;hu5.i u4za 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. .ym v/i u*i/+u7gg2jd.b csvz The motor operates on 120 V AC, and when running/y ui v ij*gv 2s/+u..7cdzmgb 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 j;u jc;d,9usc).* wixenpj*+-e owg s)*m sebresistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What ispdc mug*unewjs*-.c); j) s+9eswxj i ;,b*e o 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 power suppl ;b:vja5flz*/ h +xbqhy. The operating current is 1.0 A at full speed. What is the b;hf5 q/h l *+b:bjzavxack $emf$ 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- e6- riw3md2ov .us9psV power supply. The operating current is 1.0 A atssv e9u-2wproi .6m3 d full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a prim le8n8omy bz/(.ju3rlary 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 tr(ajfj+ lcq 79 9;3vxb0vge dvoansformer causes 14 A to flow in the secondary. How many turns are in the secondary 7f;xjbd9 3+9(vlovageqvcj0?

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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 s fy0gxmx-f-b iya 4-pjat)2p*econdag-tb*a xjyf a)f ixp m--0yp24ry 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 secondaos 2)7 namia4sry coil. If the current in the secondar27a4siamsn )oy 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 ; eph,blqgwmr 0aw6 ()the primary of a transformer. Assuming 100% efficiency, how ma6)(pw whq; bm0r,legany 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 transformer provides 7500 V at 10.0 mA. The p84e/cmow r:;llts dv+rimary coil lt/; rw:s+oe c lvm84doperates on 120 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 300 turnfio) (s4. 2 ncdj8bhdfs on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is prechjfd4( fn d)bis o2.8sent 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 tul)a - mvfxry;c1li(+ srns on its seconday l-) ic s+m1l;(xvafrry coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 th 4j/zz5 dprdfn:h6t5 urns. If the input current at the primary is6p5j:htd f5 zzh/d 4rn 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 transformerat2-8-5lspl v;uoy6 dz1 g obv has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 10zg5ulsovt2;bl a8 doyv-1p-60 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 am3tsg*3orj1u m5ogv dh :h )+turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting fru :*vor1a od3gm 5mj) t3ghs+hictional 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 ;on mt7f5 *ehhm88rao voltage is usually stepped up to 4500 V by a transformer and transmitted through a power lim85moha8n7ef h;t r*o ne 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 120 V. The voltage wi15:pvzox7 + d ewo ;ci3+gyhf7w+aw is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistanc+ i+xo:owyg;ivzd+p5cf 17wh7ew 3 awe 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 kz/q kr y;8+vc*(o w.ux:k msnky:8bvvoltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find t.kv:osk8wy/yb+ qm :zv*runk8x;kc(he 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. A gend-.nwfvl a6u*s)a 0n) ozt1th erator pro -n))*swh toal1f6danv.zt u0duces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would 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 kmg91m qjkn-xltw f1 -5b 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 turns ratio of 100nkf- 91jq-wblm15x tg :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 100mhz 37b **ojvnu8i*fljb7cy, 7a2tpe0 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 100l*o zu3p7j ,87ca febv2 hb*m7yti *nj0 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 44m)6 hun04c-g m 6jcbez0 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 izcmhe cb4-jg 6)6u0 mnn 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 oo k4jzly(m:z wj+wh0l(d*iz ,f 5.0 A. How much energy is stored in the coil's (h*i4,z k(jd0w: z+jo mywlzl magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6 x;c yijxdlgnnk4zany 5j, 4 07+nh8:h.0-W resistor and an 18-H inductor. What is this circuit's tix7j: z8+ 5yg,lnadn ;khji cxh0y44nnme 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 Af m(j0 g7y0hmny-u7q-jhqk8jC 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.wacx37c23u mh 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 resistm70h 4wofg hy1ance of the lamp?wgh71ho40f ym

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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 n i2q 2i/cefam)u7j(rac power supply. What is the peak curren cajqi/2 i7(ef2n um)rt through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 1 nz)c,(8 qdafl20-V ac power supply. What is the power dissipated in the resisda(,)cqn8 fz ltor?

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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 resisto5;emf1 v( bp;;zsnfhz) ( bttjr 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 resistoym 3go rkx:i xex678-:vcspd8r 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 57+x(jso9 xgd8ofa y )ndmax94r+xo w20-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 60 Hz?m5( 8dcmu3(o hvb 6vbl

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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 oye1 rw; ,3dfliwlh8c,f a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductip+e5*pr uwu2 vve 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 157hfgfl al1:777f 7erpj 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 indzlu0p4 v*.5bqfzxioi +q (* gyuctor when 120 V AC at a frequency of 20 kHz is appvoiipx(f+qg*.y4q5 ub z 0 *lzlied 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 11yp1x95k oip zcj9ma /vg1 cx090-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 reactance n(ui+ ourr*u ib +2u/rof 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 neeukvp(5 f+9g 9 2otxygc u*,mtjded to have 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-bstbu; t nz(ipgt8128mF capacitor 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 be dapt( yd7e5 -r100 W5-e (tdp7 adyr?

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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 y685ma(4 9eo tjojmbi: w,zmo.0010-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 b d.b-ar;bx64hoxl8 kgd5s-93fadp n ac series circuit with 12.0 W resistance, 15.0 W inductive4bp8l sr x9 abaxbgfdo -hdk365-n.;d 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 100wt . ;iz (gfrbj4(u-vv-W resistor, 20-mH coil, and 1.0-mF capacitor are connected vzv4 .ti-(fbu ; jg(rwin 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, 20m p7ck 3o pw2(o4:k(feyqzzls )7s0 tr-mH coil, and 1.0-mF capacioy 37rwp :kk0f7otsq)4z(elcs2pz m (tor are 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 cow +;a0o:xp/nas9(jdk:z6c(b z vyb d n cdke(9nnected in series with a 20-mH inductor, what is the impedance at c ; n dy z9a(b:o: (p0kdaebz(c xj6vn/s+k9wd1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, .*dngq+u7zww what is the phase angle at 1000 *n w+.7wdzq guHz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil ixg9y 7dk9,mvikzmg n)5 / w cwc-;b-kand 1.0-mF capacitor for a totx d vwwk- ,/imgymin b 9zcg9-k;7)kc5al 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 following capacitauigc*du8 ii nv8(ib0 8nces is needed in series with a 100-W resistor and 15-micvu d*8u(i ibn880ig H coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series withuaq6- 3.0m dg :ud.3apprnvkx a 450-mH inductor at 5000 Hz for a total im.kpu 0-:vx gpdn qua dm6r3a3.pedance 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.axb9wel837ra7r tb8f a /jeq.0-MHz for a total a7x tqfa/arbr7 jeb. 88 el39wimpedance 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 with a 20-mF capacitor. Whw9r+sig da2q: iic68zat is the impedance atg +rz8 dqc9i:iasiw62 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series withbmclo 8avh: ia8 j.6jm, ;vk5/wf elu6 a 10-mF capacitor at 1.0 kHz for a total ;lhu8.ojcvwma 56kvlm/ i,ja68b :ef 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 atkqj/t)/e)/ p9 8e frqlvnhj: 10-mF capacitor at 1.0 kHz for a phase athevrn //:jjq) 9f8lq etkp/)ngle 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 3i73wu b/ e5:/cmckwx-qfokz2 0-W resistor at 1.0 kHz for a total iwxko:e-7cf/ub5zwmiq c k 23/mpedance 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-mFu0b76kp sc*tk)q9etih ini;4 capacitor at 120 Hz. What is the phase 4 kti )husk7qpci* t0;6b9eniangle?

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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, d.3 nunap* 5fp )p l9rhx/,xtb20-mH coil, and 1.0-mF capacitor are d .3) pblh r,naun*x/pxp5t9fconnected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10s p,2/lf6. hsb tjme1o.0-mF capacitor, and a 0.350-H ifljo 2ps6 es bmt/1.h,nductor. 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 capacitor of capacitive reactance 30 W,b*z**uuem ,em1pg7 s l and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What cu ue* g,1zup7mm*slb *errent flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a)3ocfj 09vojm zvns1- 50-W resistor, a 10-mF capms3ovz1jn -c j9o )vf0acitor, 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 in series with a9x xt oegi,o;(:e nz:(vinmd( 500-W resistor for a phase angle ooem ((o; ,(9 nixvgt en:z:ixdf $40^{\circ}$ 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 =afeoj x3.h e2/9x*lga 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum.oahe*/f3lx a g2x9e j 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 outputipw2r gg54l 09-cg.wgk/f m8lxj+r tf in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connecte-j4f/ m0l gf 5 li+g892pg crwgxktrw.d 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 4/2z)dsw nw y6c, hyktu .sx;9ucjj,x;cpq(pAC 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 impedance of 60 Wq+wksi jd+ 4b/ and a resistance of 30 W. What is the p/i+4+bwj kds qower 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 cons 5fv2o:eq:ryiu(; i4od 2gvvtaining a 50-W resistor, a 10-mF cov(y;vdg u2rf qov5is4::i e2apacitor, and 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 caa6jj4 ucfxwdtbw . f9 .06k-zxpacitor and a 15-mH coil in series? wf9j6.k wtca0bzuf . j-xxd46

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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 freq:k.zh:wo ;a mkuency o wm.; zha:kok:f 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 needed in series with a 3.7-mH inductor for a reso e;s84ogc e(b;jeao+qnant frequency of 1000 Hz q se8o4ojea(g;;ec+ b?

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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 sekh-sck :9dzyd.ly/l8+i 9e l wries with a 30-W resistor and a 40-mH coil if the resonant freque yl.liz9kd+kd he9:ls8wc /y-ncy of the circuit is to be 1000 Hz?

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