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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 eumwth(pgv(hzsj 1 :8 *9k*rfof 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 that trrg yahj ( )c6(d,;gyk; +iri5elcg m)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 y(fsni21)qrut7;c *6pvet*x l.nqm /o, gvomof change on thtqcmnq.g 2/*(*t7 ;,lpuni m 1 vfor6v)soxyee 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 ;nsz. (zz-v,egtljpkxp*f /4 field through a loop of wire produces what kind of changtz -/jf ,lvskpe4z n*z(. px;ge on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire pro4+;1avsqvmdq)o ya m6duces what kind of change on the inducdqm+4asyq ;a1vv6om)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 fromm5ea 2 t b*av s6k:geuuaw/(e5 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 dg(mr4r 5ji )jld/:z deirection of an induced current in a conductor will be that which tends to produce which of the following e i:jm(gz /ed5)drjr4 lffects?

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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 is he mqfw3i0.4nqx:f 0 hjwld above its center with its north pole pointing down. The stationary magnet induces (wh wjfnxqw.mqfi3 0:4 0hen 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 held above p-p4ko: kh)p bits center with its north pole pointing down, and released. As it approaches the coih-k:pbpp ok)4 l, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vector po: 4duxwg p 7cofmr*g63 *i+2f grttvc-ints stratrt* iucxmd: o2vr3 fg -6*gwf+ 7pgc4ight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level w5z6,pgv83z nfi/ moi1gf)m8ps po /s2 jyx/a table top in a region where the magnetic field vector points straight up. The magnetic fieldfmp138 ) p5gz/x wysjp ai2o,m/gvsnf8/o6 zi suddenly grows stronger. 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 r. p eti5/r.j0-9wm l4yzl enogegion where the magnetic field points straight d rl l o/w-4m5.izn.j09ypetgeown. 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 horizon as3 /fz:ocid-tal table and carries an ever-increasing currei/f3zc :ao -sdnt northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pokpc4 *, fz ny(;w+cqnjyj3j(wz ,v3i ale entering first. Asjnya3vwnjk4zj((;+y3 , zw, i qcp cf* the 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 rotavb 8rz *;:4kw )ls (+psdhcfczted at constant angular speed about an axis whose direction can be varied. Inkw+:sb dz4zcl v( h*fsrc8p;) a region where a uniform magnetic 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 rotated at constant an+.8k :9et g ru y3.q3brjogejmgular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what mus..mtou39jygqe:jrk8 b g +er3t be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law. 9s isn/+gl55bi9y lnw
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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 anc c.j(rm2hr,r $emf$ 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 macmazzxci1y+3 -(bpo0 *gpyo 6(k ,:zbmuon5p gnetic field. 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 .azvza6 v/ 9b5o5kknn) is moved northward at constant velocity throuv 9a5k anv.6bn/5zzkogh a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a q gpfbi.7 ;9ddconstant 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 transforkk i :uds:rrl (9 ilc- :on(gun,o3-bhms

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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 revolutions each seco5y l 5ajqa ()ggcu)ti8nd. The frequency of the au()tg5)lqa5j yci 8g$emf$ 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 dev 8qciq8ng c63yice 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 that u1)p;o7(czg o0ih m7 qdnjf6g

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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 sefjdqs4bhi +i4 ed.tgvk ,p ..,h.r,hkcondary coil contains more loops than the primary coil then it ishf ith.+j i,v. 4rdbqkg..es ,h4,pd k 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 loops3axaz 0;lu4o x0mz cy. than the secondary coil then it zo.za4 l0 0cy;xx3aumis 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, theuhdj612+o*8l asxtwbnx ov: / 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 circn ji-ust x6x;oi8 3a;ruit,

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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 imyhe7,-uu q)jis3++un r-ywfn series to an ideal battery of constant terminal voltage. At the moment contact is madyq +)-m,w-3suf7u nuejyh+ire with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected i3ea 33nd8rp +ldrax (g*nja) bn series to an ideal battery of constant terminal vxaj g e3drn)n d3 b38pr*(laa+oltage. At the moment 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 resistance R is co*ymcn ;d,5s vnnnected 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 trlli382-shpwith 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 resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The timmh;uqaam3 s2h-0. ci he constant for the circuit represents the time required for 2ma q.ah3u;i- hm0hcs 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 -:gr hg+/arbyare connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the curr/ ggby:a+- rrhent 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 haxf q7b5 akknnf t223t6ve 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 po0cz )njca 3ukq*uj2t/wer supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. Iqd d e,;5x2xntn this circuit, the currendd;x 2n etq,5xt

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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 c;r pv;pp d (k;ybp79qgircuit changes by what factor when the frequency is tripled?yp kg9v7p;br; ;ppdq(

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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 vol y;4h. xoub4pabk / - jj+/zulil/b1yntage across an inductor is doubled, the inductive reactance of that ind/b -o/ujb.+u1yi j yba 4;lh/zknlxp4uctor

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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 indux yyq*(u.f2d,rlefi4b5uk7 4 app5 s dctive reactance of that coi,24eyadkb5uyq 7i(pp f5fr* u.d lxs 4l

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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 tvpfisr ah qkv-4mm/+ a9l4 ;z-his circuit, the curre- a ilzm;svf+/-4v krhq9ap4 mnt

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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 civ1se-;y*pqa sb .pxa 1rcuit changes by what factor when the frequencxb vyq;aa1sp1e*p-.s y 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 capac*kdy v1oj9+ zufw.(l3iizlo9 ji9l9iwz. y+*kud o13fzvo(l itive reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacixx udvf1fm8f (c;+iar a+(te0q9q k 8ktor in a RLC series mvfce aqd+kta1(9;(xfirqk08x f8+ucircuit?

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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 circuy5 el gkbz/-(uit 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 thd zp k:,ushl1p9m2v xu;rg-r2 e circuit increases if R increases. When is trdx;hs:2,- 9p ugvr1um2lp zkhis statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the cw lxyzt)m;.)o5 fb lz;ircuit 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 e w nh:f0+hle u+hc/2bcircuit 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 cap2*xp+ jrz su: xxa q.w0m2h,wt/ate,facitance both double in an LRC series circuit, the axhst., mjt : x0uerz,xwp f 2q2*/+awresonant 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 by an AC applied voltage. Az/ od w)7u)th:wn-rmlkwtd0 *t 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 RLCt jp 1n1ag(il3 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 radiusju5 lw.yt/3vm a9nnx/ 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find .vu/5ya tw n3lxj m/n9the 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 in a uniform b/cvbkpb7 g/3magnetic field of 0.20 T. Find the magnetic flux through k /b/vbpgbc73 the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fielbwo u4.-zw jg kc21o.ad of 0.20 T. Find the ma1wuojgkb aw. o.- c42zgnetic 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 area of an adjustable siaowu04l* ggw*ngle 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 cn6ik;o 8xokxc( 4(vgwupri qbp2 *7a ,hanges 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*bem 8d ybj0o 86a*xlf sides 18 cm. A uniform magnetic field is appldfa68exmob lyb0*8j* ied 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 agq d oxp r6ulf 7o;g ca;1p/+5hw07(skolifq1rea 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 aqnajx3f)) e7nyjya8::w n/o tnd area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies02q pcb6n4rln horizontally at a location where the downward cnc6n q0 r4b2plomponent 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 constant angular wz3k.:y4iz r- waitv0velocity of 2.0 rvai wy0-4i.r3z:wt kzad/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-s8oxvg0)n sn 9mh+ze6mectional 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-ls/;j s5rt*ur peg b4 of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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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 * t inuaec 9,tfea*4gn 4zvi)3armature. 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, which is perpendicular to the axi*)9g vnuz4iit*e, ec4t a n3afs 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 12a an/ gct.apwire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an oubp 0- +a5lwpr )jzka.stput of 12 V maximum when rotatedz )s-l0.b5rjapkpw +a 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 gener1s s q+dal4y3k:wck7tmck2 m; ator 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 gth22db,w4f v ezz7g: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. The motor operaufwv7q9rtwpj16q+ t :((rpi ftes on 120 V AC, and when running at ful jt:7qr(1wir p wq(t 6v+p9uffl speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply.g ,p fkb(,iiy.u;agz8 0nt(ml The ope;8nuai ,. z ily b(pfgk0,mt(grating current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. T+ zg9 -(uc7x sey2yq3qwu a9qkhe operatuaqy(z sqqcgw-9x2u7k ey3+ 9ing current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. b d.2ui;p(li6ykp9-h ar kem9The opera9.;ba2k9i-pmpr 6uylh (e ikdting current is 1.0 A 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 needed to0;s y 6tnl5av a ra;uj7(okw;t 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 transformer8j4a1 q 7hqq qno3wg)h causes 14 A to flow in the secondary. How many turns a34n71qg8 wja qqoh qh)re 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 necesfk5i2w q*f8j s8wm g4u*8lx qysary in a 110-V primary if the 24-V second 8fm5ywk j qs8x4i*8u2lqw* fgary 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 6zc *5w*pfp3i h+pnp7bps cg, 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, whaz * hncpbp5spf3cp*w7,p i +g6t is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primat(b 9be 6eiiq4ry of a transformer. Assuming 100% efficiency, how many amps at 24 V canq6b e4 bi(eti9 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. lecn7jw1. f*y The primary coil operates on 120 V. What does the primary dra *1ny.elfcj w7w?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer:-hud3o2nn ilkip. t; has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primarinlt hn-ki; pu:3d.o2 y, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 txk mhv.v,4sf 9urns on its secondary coil. If 120 V xvs 4fvkh.m ,9at 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:m-ezxyt ox6/ turns. If the input current at the primary is 100 A, we can expect the output current at the 6y- xxe o/:mztsecondary 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 kijp 2tds )74gsecondary has 200 turns. If the input voltage to the primary is 100 V, w27kigd4jt)p s e 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 turns and its secondary hak t5jbc cl7buj46)c7ks 200 turns. If the power input to the primary is 100 W, we can e 7tjc75cbjl6 buck)k4 xpect 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 +jetd h05.48mmc ak;n6g tw msof current at 120 V. The 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 turns inw8c4amgd jm0k.5+hm 6;stn et 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 yx;o-3+1v cdwg:ox5. .s:emeia ulz ycurrent at 120 V. The voltage is usually stepped up to c o.zi: ulaxvy. +mx1 wy-edg3 :s5e;o4500 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.

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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 usg08 u c0ciy4luually 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 nu00 cg4c yi8ulot 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 h:+/ yzkzx 4zqgenerator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage ykzqh +:zz4x /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 wupp4 c (3lrzju4jif* ; 8w-jy50 km long has a total resistance of 0.60 W. A generatorl f3wj48- uu z c;j(ij*4pwpyr produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power w h.dqj8ygfr xvsep,;qp /,fr b*d 1+:eould be lost if the power were transmitted +;bqfd8ph,/f s:. gryd ,ej pv*exr1qat 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 gene dxvc*a.bevg*8ey m/;rator 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 generatorm x;degyvc*vab 8.*/e 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 energy is stored .kdmdo ln/7l q(*) pcfin the coil's magnetic fieldlnk/od(*dm lp ).7fqc ?

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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 contakun1l: vzkx -.ins a 6.0-W resistor and an 18-H inductor. What is this cilnku x :k.-1vzrcuit'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 rms voltage is 128 3q savmt:)yv0 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 ouyesh)fea-e :: t35t;nptxwf 8tlet. 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. Whqla4m-z,c 11 qlm ;ji4yval7hat is the resistance of the la;lq-y h j,1icq7l4lv mm1aaz4 mp?

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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 is2rqox ho9// akgj6ipy6uia 9 cbg./q8 the peak current through the re89g26hiok yb ga6/qijp u9ax. c //qrosistor?

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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 power ( :mr;clnbq 0j 2hue1qdissipated in th 1cmrqq0hb (n;:uej 2le 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 sgf m4u mi*:hkm))3ul , e5bsbo hj8s.a 50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-q9 li. jfc x:w*05xiupW 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 re *xp -utl -qqxrf-8zi*p s9i0esistor 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 Hme k//;tdf:y5 y cas: e3ijnm.z?

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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 2.4k q1yk k y:squ9;bs767 hacj.bb+j cu50-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 hav6yge7c8).(ergrpo8 0f ysryq e 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive rea/ar2-nv ifup:ctance 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 frequency of 20 kHz is+ (3niuude jxvab9 l6: applied to i9e3vl daiuxn+ :jbu(6t?

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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-Vdy82ljt.f iuz; (xul* , 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 reactirb3bf */*hmi ance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor 2 hefn7+h4hxeis needed 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-mF capacitor have a rp9r a/ k)xhe13mgin+ueactance 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 willa1l/i*x8y6 w0z;lxhqfien s 1 the capacitive reactance of a 0.010-mF capacitor be 100 W?x8/0l6ei anw ; xf*z iqshl11y

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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 zlhhtb+rmc3dl-a:m c5 .ec;5 a 0.0010-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 ac series circuit with 12.0 W resistance, ,7mgw8 p) zxeaqjw4b un*pcn33h ,xz 815.0 W inductive reactance, and 10.0 W ca3j48an, 7pwhunz e)zw pc 3*q,gxx8b mpacitive 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 r -ji4gz86mnz8 hh:lusesistor, 20-mH coil, and 1.0-mF capacitor are co6hi 88l zh:sgj 4uzm-nnnected 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 coic(7y br** jhztoz;jkxrhdfq g y:,;49l, and 1.0-mF capacitor arx o*qkbr*h fcyj,4; : g7tz; zj9(hdrye 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 in series wi vzvg ,bs)-3yath a 20-mH inductor, what is the impedance at 1000 Hzy 3,gv)s a-vzb?

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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 207d)tf,hh,8 3oeyn3y9d bhkp b-mH inductor, what is the phase angle at 100tk,p 3yd)bn938y hohe, bfd7 h0 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 needed in a series circuit with a 20-mH coil gaspb8n-tk , 2and 1.0-mF capacitor for a total impedance of 100 W at at-p , 82nsbgk1500 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 needew .q yccccbj-m*wljyos .h).5 3fik;ywc 5 5m0d in series with a 100-W resistor and 15-mH coil t hyb* ys ;-0mky5ji)fqwjcoc3lc 5 5ccw... wmo 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 inductord ba+y597c87) +sdynr m al(i:x oytmb u4n;xg at 5000 Hz for a total impedance of a7myiun4n )xgbxbmad:r+ lo t;57d c(9 yy8+ s40000 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 1.0-MHz for a ag o(v,wx4lb.sm;(rd total impedar;.( odwam (s4gvx, blnce 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. What is them 1qfh*i8n 5nb impedance at 10n81fq 5hn mi*b00 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 wi/5kzcl jn0ha3 th a 10-mF capacitor at 1.0 kHz for a total impedance of 45 nj5/k achzl 30W?

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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 :60yw.wtfjmdrh o 0n7537hzcovetc; d1t c/sa phase orfo1/y7 wns dcw0hde hm:0v7t; t56tccj 3 .zangle 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 re4vo2 (ywv+/rfa14b2mcie)vc; uu qlb sistor at 1.0 kHz for a total imprvv2c c;b4me q+)b2o(iaufv14 l u/wyedance 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 at 120 Hz. ;wi6wtq6q x.eWhat is the phase anx ;.6iqq6 ewwtgle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1ot/sfw /:i v9g.0-mF capacitor are connew9f/ /isvto:gcted 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 resistg)y*rccu,-z 5w3 yfl o0uu1f7mq tq g.or, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connuy*rctc35lzw o 0q1ufm.-7u ggy f,)qected 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 ca5pjw oza g gonv7,m0nad9 y6+*pacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current* j76n go5mzd +wnoga,v0 yap9 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 RLCcj0xuobc 92wfq: ww+8,.w opw circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor.wxbc f wwc,2w9pw oj:o+u08q, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a pyepgx,8 q:g 0s5xsd st)n x0y(hase angle of 5dy) s 0xnxqy(pg ,:0g txss8e$40^{\circ}$ 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)izsws0* 2q mv.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from sz2 0svwi*m) qthe 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 (u; vypo9 mqf)g qr-3ze-nymk e5h+z 9series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capac9yq-539)heqz (ke+fp ymnu mv rz;-goitive 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 A.j19vlielqyf -zl1+t oc :;opC 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 6xnm,znn/ 1va 53 fart:0 W and a resistance of 30 W. What is n fa m1t3rna5z, v:x/nthe 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 series RLC circuit containing a 50-W resivuhi e6fi25a3 stor, a 10-mF capacitoeaf2 iiv536h ur, 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 frequenc y33imx;+uk o);wlgjssxd(q0y of a 1.0-mF capacitor and a 15-mH coil in series?0)3+gqixw s;sjd yx3 ko( ;mlu

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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 ser85x2zfmccdw/;5 dva5* d2 k la:lb zcuies with a 4.7-mF capacitor for a resonant frequenc25*b:cczf l ad2c85adludmzw/ vx; k5y of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in seriesx ye ij1m8j j60* bcl*rk2d*qd with a 3.7-mH inductor for a resonant frequejx21 6li*ke 8 0d*cy djbqmr*jncy of 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 placewfg gjj9 e4 .6wpz(l5kd in series with a 30-W resistor and a 40-mH coil if the resonant freque.j g5 lez6j 9(kgf4wpwncy of the circuit is to be 1000 Hz?

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