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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 magnetic/agbr d7: w0sa 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 that4ke3p (tyu3 gy i0+md tial2(c q3yhw/ 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 lo-,/ l5mm ozgetops of wire in a coil produces what kind of change on theg etl5z-, om/m 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 produces wyf.* yrg dm/:sq.rzw.hat d.s :m rf.rzq*yg .wy/kind 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 o xir20h6jxca2 f a loop of wire produces what kind of change on the induced hxic62xr j2a0$emf$, 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 froexg/9 la(khls u;.iqbacsq;.pzd) 58m a 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 conductox :gak (mjf.1fhh *sh)r will be that wh*f .fm):jkh hs(1agh xich tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet 1y:vn67+vk s p jt/0 ei.xboynis held above its center witxkj/t b1+v60: y .piyesvon7 nh its north 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 magnet is heltw s pw95ui:wpd*;j6vd above its center with its north pole pointing down, and released. As it apprp5 www ;:s*vp69ju itdoaches 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//x(m4thrwan2 n99 nuh1jy1eg9ckr c the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed fr/kaw1 h9/h4(jec9tmcxn ryg nn912 urom above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic field vec1nl.zoy i,qe vf8v4+/e9e z rutor points straight up. The magnetic field suddenly grows stronge ov uriye9.q8fzn/l+4e1, vezr. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a rg pw i9(7hnf*jegion where the magnetic field points straight down. T7gpni fwhj*9( he 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/8mj4pc l( ysm/pcr.g and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the inpc.s/gpym8lr mj 4(c /duced 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 d33b xogp9ao i, 8 xp42 /mvt/embnxh)a loop of wire with the north pole entering first. As the north pole ox9 hvanpp38bdoix2/m 3/) 4t,e gm bxenters 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 a tl (spd:ne(:lbout an axis whose direction can be varied. In a region where a uniform magnetic field poil ((t::edplnsnts straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant aoy(t y/yzdm7j205wxbys tnus5 a5q2 ,ngular 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 the loop's axis of rotation if the i0,5m(qw2ba/ tyz st2yn5sd 5oxyj7 uy nduced $emf$ 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.3c mgy2 a 4q nf3g3s(sqksraj +d*x/b7
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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 tqsrcg/urx h6*ev3t o94sd(t*hat 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. Thehac z11)5xts c $emf$ 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 northwa9ky(y4pyrcy2uxl ;f 9 lgn2k w03pe m6rd at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential inducegyx2my4( 9 9lyw 3re2 f0np;ckk6pyu ld 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 constor1n5hm imvb4st-bg tm); l ;3ant 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 transform 70vdtn2f3ip2ys *e cis

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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 revo6nilk* b)792jfcf amnlutions each second. The frequency of thelj6n2a)fknfci b9 7m* $emf$ 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 trd*oyrpq)c7 t-.rn hi/tj4v3o

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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 sqnd8h p)0.+2 zkxlo:xxg7n xthat

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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 cont :mn)(cu-mcm+ wip* khains more loops than the primary coi- cp)mhikmcu nmw:(+* l 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 coil c5( /wjsae2hiv ontains more loops than the secondary coil then it is as(iv he52w/ ja

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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 xlc.6v taxv8 . jvw41xt/1iplinput

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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 cijb v8l t9)2x5u+py u,yv/(cts ;mdqugrcuit,

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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 arvy36x b*vr m .xlk4aa dzvm+,9e connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the re . r6*a dvla9mkvm,vxb+x34yzsistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an o . -2tq) t0eftvf8kxy0bf;(*iq zq dhideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acros; q.(of h20ydzqt *itfeqb8 -t)0vkf xs 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*jm(0 lnpyedb b3sbeo+ r-uaj:0;,du ith 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 resapt 3 o(wjsvebg66y k 98p-a:uey8)geo2 cr8bistance 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 bat(nrzywk/s hqd:3 ( jrepkq 281tery. The time constant for the circuitep wy/ r2q813nzqrs(( d h:kjk represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected inz v6vo)c+hbf2 series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circf2c o)v6hvz +buit 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 unitjes* 2n ( )px2f+b,3zx xw 4wu,cmgdzts 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 circ udo 9 pzsop3pdb10g31tyh h,70)jewfuit, 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 con2uk *u0ewg vg+.o s o)cm;,dysnected to an AC power supply. In this circuit, the currenksu vo gc)m;2u 0es+g*d wo,.yt

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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 cnfcd5l pf 53p8hanges by what factor when the frequency is tr5fpc pf8n5l3dipled?

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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, thoj b/;diuq9l. e inductive reactance bd;jo ui q9./lof 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 approacvt3e0f95e,cs 4 /yh ybdj;ozzhes zero, the inductive reacttzyde ,b4c0z ;fvy9shj/3 oe5ance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, the curr(o-hna ax5gls9zvq: w )dmb51b4 /ekxen5wh- 9) sela51(dx qznovk:bba/ gmx 4t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor7ma;cgx nzoos186l1id. vm8ph2k r+l when the frequency is tripleddim l nx8 v7m+1ghsr 1 2p8oz.c;l6kao?

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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 approacheswp 4q8q rfsn;/ zero, the capacitive reactas4 w;pn8 fqqr/nce of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and ca- tiv2n 9;r)/k4 kbchh bhj7cxpacitor in a RLC series circ7h;ni v4hjr) xk2t /bh k-ccb9uit?

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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 de.t(m; vypze ir(ai-x 5-g d*nvfined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R increasej2 z7h xanl9lme2 46ies. When is this statement true6h i72j e2am ex4llzn9?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases i-jd j a7hpxb3/f $X_L$ 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 c)xe./faob6tx 9w5nd circuit. The impedance 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 double in an LR-my2:xoq-3 vbd nneg9C series circuit, the resonant f2b-d:3nvyng -ex omq 9requency 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 voltag /l*on9 *bzd.vwzfr u;e. 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 RLq/e lqtvhu6 ,ufrj,t 0j+h-v.(v zux +C circuit occurs 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 un vhti 2(+kj1d2qvmmg*f3lqet.e)44t tb 4q lxiform magnetic field of 0.20 T. Find the magnetic flux through the loop when4jbq.i1dhv4(2 24lltve q3kg+txqt*)mfm te 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 ra -,ikwr0c4zmnn ji q1m tsnn6(df( 33tdius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the planewrt(f i6qd3,m30-n( mcnjiz1 4ktnn s of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating . fbql:p i)+k*csuh*wu+t 9ns in a uniform magnetic field of 0.20 T. Find the : cui** )puw+n+t. q9blhkfssmagnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional areafejf5q8d 5 4tn /:4zj mdt8;tfn bztp+ of an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coi/7g(blje-d ut8(gvi o l 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 s8d*mr, li)uo;wit s9dides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced )ilt9r*iuo ;dw,8 mds$emf$.

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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 ofwgh q *r1ua7*,aa ucv+ $0.40 \; m^{2}$ 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 ar1sj 9.k+)+0 divaubby 1bempes5k, ssea $0.20 \; m^{2}$ 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:bz;x ig(d5 rm span of 60 m flies horizontally at a location where the downward component of the Earth's magnetic fi;izmx:dr5bg( eld 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 lon dbj*nj+r3 +o 0yeeuh-g rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a conn rj+bh+ee joy30u*- dstant 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 generato ypy 8n8be6 (t-5yefwqr has 50 loops and 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 of wire of area,pa 2i uncje mda63rrhet 1*07 $0.090 \; m^{2}$ 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 it ohdiqbt ify)+8ga/)r/ 8 6se x8k-rnps armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T/rye 8id8r oi ) ftxhga8pbq/6-)+nsk, 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 101mbsaj2ku tj vfr )sbq66z*a0che9;+) cv +yz0 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator witht-i zd8 ngpc wrs7))b, an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0dzgnti scpw),8 )-r7 b.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 gene 8od5-n;,u b)ejltp 4 rfqe*d ls+eroiz)2bv5rator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operatesbts(o3pw e a9ybq+n.- 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. hnr8xqx c1z0:e lhzz2vm 03:u The motor operates on 120 V0l8u3:nz0exc:rv2xzmh1q zh 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 resistance 6.0 W is connected tco6sh5k jbv2rg9q (o5bfy,xja8b.q8 o a 24-V power supply. The operating current is 1.0 A.ohbv. 8q6g(b52c8 q aobj f9rs,jy5xk What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power suppp( yex; dki4; 5 xmzb(sj4wk-mly. The operating current is 1.0 A at full5dimb4k-y sj(x z;x;(pmk w e4 speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 c1gw*by/lw,q W is connected to a 24-V power supply. The operating current is 1.0 Aw l/yq ,1bgwc* at 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 ncc(v+ hw6g*2v-k n hmrpi: cf+eeded 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 secon3 ish ywur7z sb0b.5+qdary. How many turns are in the secon5w7i sq0usbh 3yrzb.+dary?

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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 nvtc/bw,9r5gif the 24-V secondaryrc/bt9v5n ,wg 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 consistsfnc)qgh( s;vj)+x mb:s* e(vx of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the cf vc x( b)xnmqjhges;+)*vs: (urrent 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 1;id63nu ,yyob0gj ev:00% efficiency, how many amps at 24 V can flow in the bndg6: vu30ieyj;oy ,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 10.0rk fel69 ;k5tr mA. The prima ;6kl frtek9r5ry coil operates 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 67 ud( bg*oard*0 turns on its primary coil and 300 turns on its secondary agod rd* u7(b*coil. If 120 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 sydgmm e)32r mu 8e(pdd0et)) g( d,uk60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what m8te dug0e3d,k())y )eusgm(p mdrd 2current 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 sb zf2ah 20g0kgecondary has 200 turns. If the input current at the primary is 100 A, we can expect the outpag2z 0gbfk0h 2ut 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 ha8(q:u,y zgymz s 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expecu gz(y,z qy:m8t 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 transformep/ ol2ip9-nd ur has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of th/ 9p i-pnlo2ude secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. Thes 4,n 9 w43azbob8 c9ex5oj2jgg y0ocv voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turnsjsw4j a9n 3bx0oyc2zc o4g5ogve89,b 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 vo8dih)/hn qme ;ltage is usually stepped up to 4500 V by a transformer and transmid/hni;h q 8e)mtted 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 Vu;ahs i*1hbr: . The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power *aishh:br1 ;uline of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a tota- z9ccvf8ab0aob 84 oo(2 tmadprb*9 ml 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 u*obd08 98-arob pmbtmc(acvzfa4 9o2 p 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:: qomm9fcdr y56 ,nx1d9ngdy line 50 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 tdr9d91dq omgm:, yyn5:6 nxfc urns 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 .+0;zc* nx4g lsmkc xfmr.p h06-W line at 1000 V. How much less power would be lost if the power were transmitted anz ck;srgmfh.c*+ l0p0.m4xxt 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generatohzuh2u,s-9 glfz 3, nfr is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the g,u 2z shh93ngf-ufl z,enerator 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 carriesilstv)02sqtr4 /s vkz;4g *qx a current of 5.0 A. How much energy is stored in the coil's magnetic fie g0) k/sqq;rtzt 42i4vv* slsxld?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H i 5d1sm)g3qni znductor. What is this circuit's time con ni3 s1)gqmz5dstant?

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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 akq d,p*ufu:.+ qx9 vokyf+0rj n 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 iv :s j1p;fj*8qcs-4 d uud; u79hqam.yj 5ryppnto a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistaqv;ow 9wsq*vootl 58m;i4eh7 nce of the lam4o 9wmh;wv;v8t7 lei 5q ooqs*p?

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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 akk6nk1r.d sa86*+th cs tkh /e 120-V ac power supply. What is the peak current through the*th8k 6 ktrsean+6ksk/ch.d1 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 120-V ac power supply. What is the ;71zdx( y/rxyli iv bx:k0wp7power dissipatv b0xx;w7py1 lxi7:kyzid /r (ed in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 5yz+bq9e ;hpy69fhi 8 q0-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 a7aq c 2hy (z)d6l6zge50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resist jua* hd(f9ilhk,.g8s or 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 inducjhul;(g3d bq5lp qr-q..el-vpl 5is.dr7 7qitor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at f 3ha n:rug;:wyqv pc/l9t b:51000 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 o8v :/j4 z r1pulwx3dgrf 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 ckrixu),-6s8*effzp 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 94zs w3gn o 13xi9vvj17seu** ryumcn inductor when 120 V AC at a frequency of 20 kHz is applied to it9wovxj7r1sn3cnus*9 *iem u 43 y zv1g?

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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 rwzxzn7 gg53pb 5pb;flx7v 2/-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 of a 4.7-mF+- l:nq4k72vwlbq iv t 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 capacitive reactan mp/mmi my*ddz7ot,1l bm84 .ace 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 reactancw25u1bzuh7i u8k 1)qii xy3 jle 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 capa 53dpuf-tz 4fssx.5rgcitor be 100 W? sgs54 .zd3u fxprt-f5

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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 an ywu),lmj1 bj-d 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 Whz3a 8ipg -d9i resistance, 15.0 W inductive react ip g3-h89idazance, 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, 20-mH coil, and 1go nsq we825j3.0-mF capacitor are connected in serieo qe5gjwsn2 83s?

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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 resis.:87k,fko 7.l u3juujlsai2j i lvxy;tor, 20-mH coil, and 1.0-mF capacit2iuuklai,jj7oj 8 l37k. ls: .vuxy; for 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 connected inm,fep it vp (kc+/b-(trn-r6t series with a 20-mH inductor, what is the impedance at 100,ef + in6vm--bp(tk/t( rrpc t0 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-mHb j8gm/ sqo vf-7ap4r6 inductor, what is the phase angle at 1000 Hzgvf sm-r 8 pq/ao47b6j?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0knw4n39z1ulwbb + zz2-mF capacitor for a total impedance of 100 W at 1500 Hbuw3n914 wz n 2zlz+bkz?

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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 seriegt- z(vaj49 xqy- ;mpws with a 100-W resistor anzv (pgtqw4y;j-mx-9 ad 15-mH 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 with a 450-mH induh b qv8u 9bep(x+fbd:c2yotd,p,2vv o8p x0f5ctor at 5000 Hz for a total imp02, d8pxx 5houfqd8 c2b vp,bt pb:f (eo+vv9yedance 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 r lox)n5pf)snucn- e ,fuh- :9fesistor at 1.0-MHz for a total impedance o5 ponenhnf)c)l f s,-x9f-uu:f 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 p.pjie01eg t:cfxu2g i7t,i 3t0 e)yhseries with a 20-mF capacitor. What is the impedance at 1000,.e)00x7pgpf3i: tt1e i ecg2hytu ij 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 id snk+r5-sek9 a4eut0i efrs ;+h;s v;n series with a 10-mF capacitor at 1.0 kHz for a total impedance of 45 e ;+h;u ; reks0e-sa5+f4dsvr9 it snkW?

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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 uum +i6.a.i ehkHz for a phase angi+ uh. 6imue.ale 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-e-l1gb6l 3*m rsy:t lyW resistor at 1.0 kHz for a total l 6 ls*egbm:ylt31yr-impedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacith:r 3o,2n8q ldxk xth/or at 120 Hz. What is the phase anglehrd x: lhx/n83qo2tk,?

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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 resist++ z g4sixadvsc:f+1vor, 20-mH coil, and 1.0-mF capacitor are cc:ad i+gf+s xsz1v4+vonnected 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 jfn4d 59cx+oi a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The f 4i9+do5c njxcircuit 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, and ano gxsh*2u5iqcdqy55 ; inductor of inductive reactance 352dh;ui5qso ygq5 cx *0 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 seriesz af7p9h0m 1eq RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inzm0 qaphe7 9f1ductor, 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 nes p47 7)lksribcessary in series with a 500-W resistor for a phase angle of lpkb7s7rsi)4 $40^{\circ}$ 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 We bd8. 2vk fiz1is ./dp:arx)auxhn:7 , L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have max:8)a:7zkpr dnuhie as i.f dvbx/21x.imum 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 3 9qg ks)i,,gky b4d;zzua8sxcircuit with 12.0 W resistance, 15.0 W inductive re 4sa9;8z k,)zks3duiqy ,gg xbactance, and 10.0 W 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 an AC circuiy dsz)v x7vr0xb-7m ae)ci:5nt is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of ( y8pi )dq)nnn30 W. What is n )y)8q(dinnp the power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a seribw ( (r ajvmfxi040 phl0u2teuaz4(0oes RLC circuit containing a 50-W resistor, a 10-mF capam(x0 uahpa4 2uj zb0l4revfo t w(00(icitor, 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 capacitor and a 15-ox zg/3p l5k8fmH coil in series?xgo 5/pz8lf3k

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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 in0k: b e2ks:ajqim a(y5 series with a 4.7-mF capacitor for a resonant frequency of 10 kHz bkky:i25( e0:a msqja?

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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 resky*nda3-;jz 3. ee wptym5et6 onant frequency of 10*eywtm e;k-65p yt33e zj. dan00 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 bsj5 ekss1uz:u4b p27a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to b41puje57:s 2k bsus zbe 1000 Hz?

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