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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 arpw*ndl;ui6 f7: :gusl e units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that td6f q ry0 u7;aqqh4sbo:f)n9zhe $emf$ 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 loop:nx -x vq.j o*tdqbsb l0gv/12s of wire in a coil produces what kind of change on t .v l/ 0vjb-sq:*2t1xnbdogq xhe 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 q79 cw 5:a2ii(rsbalm the magnetic field through a loop of wire produces what kind ofc aw 9l5qi 2bm:sar(7i change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind oflso7 q;v /7ay6 geoe3c-ay5hp change on the induceys6a/q eo7; oca3-e phgly 57vd $emf$, 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 magnedu7fw zwp4/iyq/ vg ju( c.:j;/2xct ntic 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 *29lq: gkjo6z6dj e lwinduced current in a conductor will be that w e w6q:o lg9jlzdjk62*hich 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 s;xd: om8*mx6q7e 2azin my i1cck.p: on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet i 6ioemd: ;xnx2ap8 qc. mmy*z17kics:nduces (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 hortf zx9 jfq.t+ .bstzw805ncvks)e5q i;o, :wwizontal table. A bar magnet is held above its center with its north pole5n:x c5tts zft k.+vw,sq 8 z.jof;i90 qwbew) pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top r+0g/bam zt*u8dz01igbc* r0ut3a- *mktweein a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above b10a- u 8z*imzte*keb/0a +0dwgmtcgt u3r*r , 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 to3r)z if+g.suo p in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the directio fisug z3+)o.rn 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 tablo: ewytz-/f w9e top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in tf:zw y9/wet-o his 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 eve8dyp c w2j)5fj/h0wlm r-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from abovjjh )w 0ldpfm2yc8/5 we, 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 poerze* s izaq((* 6wa7bb6i2zxle entering first. As the north pole enter bw2i6zzexra*eq6zbai((7 *s s 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( dzu7z0pa ,hz speed about an axis whose direction can be varied. In a region where a uniform magnetic field points szzh7z0(du ap ,traight 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 cons4p/e9x 1lq av-kubk7,xg b u5ztant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, wh ,ku-v k/5z7gax qe l1uxpb49bat must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.* t/9cba0 8vc l vs*6n7czbecg
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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 t k7c5m8es7 j1pi5hi van $emf$ 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 mar*5yro2( bkk wwn -jst b(k32oe cr/h.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 th;/a;t 3gf(q cpiys u1ae east-west direction) is moved northward at constant velocity through a magnetic field that points t3fcsp ;;qu(aa 1i/yg 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 constant angular vjo69 l7ly m j-)1rnp 1ioy.amaelocity $\omega$ 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 transftt19yb mf-rb0q v ei825bkp: xorms

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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 second. Thvol2+-s r vp-oe frequency of th2ovop l+ rv-s-e $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a devicec1ect,pm4at o8w n m79 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 ks*cq z*aggq6x,pj 6o e1 06ilthat

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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 cuhp)2x,(g fbb*nk k4i oil contains more loops than the primary coil then it is * bbu42xip)fgnkk (,ha

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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 t.z66oa5mm soq:f j -ohhe secondary coil then it isho 6oqj5m fzo -.6ms:a a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the powexj4 rm/(kjg8 tr 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 circuit,l0sfcn vgm:f 3u *3ck hnpk62(

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an idea8 w cnnq,jnx7mvs4 b36l battery of constant terminal voltage. At the moment contact is made with the b sm6xwn bqcn3j8 nv47,attery, 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 are3.hattl(bp 7w connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the t h7bt3l.p (wavoltage 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 av23ix o 4utgllz 0,m0snd 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 resistance R is connected to (s /* vaeyy.znvjt5, zn,6/a: awjrs ban $emf$. 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 bam aa g4bm)4(flttery. The time constant )g44m(aa m blffor the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor aukxl /o /nfr.19ttxmty(i6kpwj5 ( v6re connected in series to a battery. The battery is suddenly removed from the circuf ut(xo1 nywr(6v /lt.j5pikmt96/ kx it. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the samen*nf 7c 1z ej;8lgy:jm 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 circuit, the curr a(lv lt+zh+e*ent

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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. In this circuit, the culirojvq 1(1vk9 rv)y7rren9yovi71 kq( vrv)jl1r t

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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 change,6hf42qysd lps by what factor when the frequency is trip,4d 26lyshpqf led?

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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 is2+x/xkfzm1n( :em kwb doubled, the inductive reactance of knxemk:xfz1m2+b( / wthat inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, jwd, atv69:euthe induct 9v6wja,d:uetive reactance 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.*k nqnyek3q;fs ,2:gi In this circuit, the curren iyk:2 q;,fk3sgeq*nnt

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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 factor when the k8hx px 6:w+ehfrequency is tripled?p +:ehwh86k xx

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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 capacitorz zz:x-q .r0o+ax cll) approaches zero, the capacitive l.o:q)+a x0czzlr-zx 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 th7uj/bblx7zx mgew /+m p +2w6ze inductor and capacitor in a RLCm m u+w 7j/ezzbwp6bxx/l7+ 2g series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of anxn tu,0 p8 ;k-s -yg-jhmy8ut1n*ywfh RLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases i.ahdv;is* b,ddap , 4lf R increases. Whea*;as p v4iddldb.,,h n is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance.a3x;en hcb 8 e w*sl/os5r(vq 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 circ90 j uo3:bkeieuit. 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 capacil y+sifz7k.szdrt7 dc)105wd tance both double in an LRC series circuit, the resonw s7+tfz.drcsiydd0 51) 7k lzant 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. At resonancz7o(*v )vr) xq hl6dvwe,

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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 akck7f:g l0odu25+jscircuit 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 uniform magnetic xj+;pz s0oz f2field of 0.20 T. z+;sxf 0ozjp2 Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.20wh zt)44( )nxoq*yo l ghmdlc .;w*6fm T. F *qgz*6lc.xlf4m(m 4)ytw ohodwh)n ;ind the magnetic flux through 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 innistj9aa/61 5ghi(u.k (igcju) b2r y a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an anglen(rhu ta1 yui/g.cjb(jsaki 9gi 2 6)5 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 is reduced fro3zf0a ef2b 5g4du m0d1q fuj(um $1.0 \; m^{2}$ 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 coilk4.q9i 5bfrij 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 fram+,i/vze a5+ xg rweec5e with sides 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 zvi+/ e, 5cew5xg+arein 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 turnsnv :fwrm .75ghjpz(- d and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns an1vigmxj 4.)jr d 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 g1orc:c2s8d:cys*h l6iwgu un8e *s*ys/i3 f 60 m flies horizontally at a location where the downward component of the Earth's magnetic field isr1/2* y8 wcf6gs3ducl8 y*osigc s*h: en is:u $6.0 \times 10^{-5} \; T$. 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 ,temn-r/e 2yu pnu5,c angular velocity of 2.0 rad/s about a vertical axis through one of 2/r5tmnu-pn,ee c u,yits 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 5(iywbq x4nvy1 *tj+s)0 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 ofg( 8hyetj.:u; -w3mw7m eqaon 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 armaturedxus.hco s 4b3kp m-ts0,9.8bps i/bu(ywu /d. Each loop is 12 cm long andps.,b-xh dc.(t u94b/y 3bi/sp8m0w su odsuk 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 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 6pfja10b9t, lv1y ehnwire 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 cun b.c/)v ly(wonstruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is /wn(by).l uv c$100 \; cm^{2}$, 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 gene8kr8ucbdo+koi8s8 n ( rator 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 operates on evc,4lywyab8l-d uyfg00s2 3 7w b7tg $120 \; V$ 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 d5x h*5;p9hq z zz44w5maga;keovtd/of 6.00 W. The motor operates on 120 V AC, and when running a*/5zhxt 9pd;5mak4ozv hdgzq 4ea;5wt 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 to a 24-V power suppkmry1. mia3)t2las 0e ly. The operating current is 1.0 a1 y2mk3r) ise.m0ta lA. 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. Th,ab- tg :skwd,v1luad4,l3v he operat34 agubkw:dv,,1 s l,-adlhvting 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 internalbooucxc t 71mq)5(m4n resistance 6.0 W is connected to a 24-V power supply. The operating curno qcm(u)xb 4 1mo5ct7rent 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 needeh-zm,nvdtj 3gy ux+ (/d 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 ablg 8dkac7s w -d9k,ue4i,3 kiuvp)1h transformer causes 14 A to flow in the secondary. H8dup-i1ickk)e ,,vslk9 b hug7w 4d3aow many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turnsx;h94ynwfi ai 5 9chf- are necessary in a 110-V primary if the 24-V seconda 9xn4 -ia hfw;h5c9fiyry 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 200 d l :i47iho,rixgl f6c(/ cwx8,v7pj5y +xdhr0-turn secondary coil. Ifc6x/hogf 8i:7jy d x(lr iv5+7hpw,dixl,rc4 the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a troab. lbo4- 8cdo.* rpjansformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondary4b.ola .-dj8poc *obr?

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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 o;h;ae -wmmqik.vu9bt a4,u6neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the w64i.;qkehmtab- 9a;,v om uuprimary 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 tbc/ +o+pw6mcxq( 2m)r)a npoyurns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primmrcy/pbpc)6 )o (o +x2 nawqm+ary, 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 itshfpp y*gj*,orq ;; dt9 an6t,h primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current ip*fpqr th 6jgh, n;9 ytoad,;*s 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 tra2 wmvefnz+.h ,nsformer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we c,+2 mwhen.zvf an expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200*n5 p(,n,tt g shq1 e)ytok+cv turns. If the input voltage to the primary is 100 yvp*5,ntk g+(h) sc,netq1 ot 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 turns and its secondary has 200 tu:rchomkf bm,: 4yzn0dh5 - 7l/aik84wu(gcdjrns. If the pm dl n5d:0:4z(r o-h/,m jib 47yhkf8akucwcgower input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 12f.0uo v/ u9td7;yqbgj 0 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total 0/.f gudu 7ojb9yqvt;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 zqn6tuw(0bp;m v5ei(;zw (xkis usually stepped up (i p0znk;zm eqww5b x;(v(tu6 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.

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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. Tsj q00b 4zw4buhe voltage is usually stepped up to 4500 V by a transformer and traz0 4s40uwqbbj nsmitted through a power line 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+o0ml a/9qf gd 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 100:1. What percentage of the original energy would be lost if the transforf+o9 l a0m/gqdmer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has kto)i(vk5* ;v hvvqah zo7b2*a total resistance of 0.60 W. A generator produ*75k2i hahvv(*vqozo t ;bvk)ces 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 egq 2.u0x1i qgless power would be lost if the power were transmitted at 3000 V i1u. ix2gq0qe gnstead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator p9nh; yf6 2fjch ew7x8;,zsa lis 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of tz6wy 8nh;9ea,2 hfl pjfs7x;c he 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 cu30xgj *ki9eln rrent of 5.0 A. How much energy is stored in the coil'0ijxnk*9e 3l gs 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 6.0-W resisl mrbksm+- i nz 2iwbu oi-n( s9d75/97r1ntiftor and an 18-H inductor. What is this circuit's time 7ud lmz 5 /r-+nitnwi7mnbik 1sibo2f9r9- ( sconstant?

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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 esw,z xyk9w,1the 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. jv0eb c0v8k( 9zvay)mWhat 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 AC1yk4pnrml :l 1)d/i,c xqi4j + c/cljqvmt,/l outlet. What is the resistance of the la)j, m/xnp i q/lvm4,:ccdl4qlyk 1lric/ jt+ 1mp?

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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 connecteb,r 0eo8i-6 lr al3r. 4junezud to a 120-V ac power supply. What is the peak current through the resistorrierzl uue-6 r0bj8o .4a,ln 3?

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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-V89wo ,jwo ms69* egyt: m6itjh*e(pca ac power supply. What is the power dissipated in the resiyjgw*me 8p,stomjhcw a(ei:66*9 t o9stor?

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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-W4gq nb-h+ q)dgh yu1w; g4me6g resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor 7j- iul,mbhqg8(j6f jis $I = 0.80 \sin (240 t)$. 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 50yv xb(ax +.qhv19u wp.-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 1ozmb88 w9m yrj(-jcgi23vr7o+9 qkz e .0-mH inductor 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 1000 ;yr uy;cp7d)kmftp 0pr1 8/nzHz?

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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 h,s.zy r) wrwp1(3efks ave 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 ne7p 3yu f .u,p,iv,ltnvcessary for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH induyt -c6oc9j7 egvu w4ag :;q;ki(p ewz(ctor when 120 V AC at a frequency of 20 kHz is apct(qvc 9y; wkgip(zagu46;- woe: e7jplied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60(;w c2vh-xhfq5 a5 ocl.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 reactancg(o -;c ;p0kl:bzsqaje of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at 10 kHa vig:nx 93bxy*(oq cq91jzz3 z?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance ,j. *gok+3uhhp ()ko tlc 9xgmof 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-f.h 4ut0ja a-qmF capacitor be 100 W?jq .f 04uat-ha

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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 u( hjoj*v 8yhcs;3g (gthrough 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 abjdqb)y 7amam4 5d9 h6n ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactm)mbh56 y 97jq dbaa4dance?

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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 w .gt (pxm+cb1at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capac+.p gmt(b1 wcxitor are connected 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 resistorinl/zi 75k qgyo (9n pb6w/ny7, 20-mH coil, and 1.0-mF capacitor ag/l7 oi/n5bk(7z9wnqi y ypn6re 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 connei-l s scgm vi4g)a sk0.tz7lh,kz:g+9cted in series with a 20-mH inductor, what is the impedance atlvik9)7 .0zl k, sgmz gtsah 4:cis-g+ 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, whb6m0yv35:nbwa jey 5dac83kf at is the phase angle at 100jf365 :dcne3awbkba0 5yy8vm 0 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 299n uowwy+fe/je kt(;0-mH coil and 1.0-mF capacitor for a totalk(woe ;w9/jfy+9ne u t 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 capacitances is needed in serydm0g;thyeak 9 cvqgi;+ g-(5ies with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 200;;vhq5g m(-iyg e+ gk0y 9tdca0 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 b6/g 5tp2) tcash uf8aa 450-mH inductor at 5000 Hz for a total pc tb2gt5)h6 us a/af8impedance 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 resis8q aa: r+hd0ndtor at 1.0-MHz for a total impedance o0hdarqan d+:8 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 series with a 20-mF capacitor. What is th (c ,byyl glwgzy(n;*0e impedag(*(0bzllgc ;yn wyy,nce at 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 with a 10-mF capacitor at 1kqq2i-x.eb,ukimz n i n82x2 5.0 kHz for a total impedancei8xmkxq 2i,eqnu2n.z2 5-i kb 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 withw8igc8w*rd+ l a 10-mF capacitor at 1.0 kHz for a phase angi8wlr g*cw+8 dle 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 ne;r+g r1ix6qsln v0sg tzk66b3 eded in series with a 30-W resistor at 1.0 kHz for a total impnrs rk6b0 lxt36z;s g6gq 1i+vedance 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 1.3fy1:xbysutaz+r 4b 00-mF capacitor at 120 Hz. What is the phase ztf+3x.uabs yrb4y:1 angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-;ev99qbt4yn g7mab 0tmH coil, and 1.0-mF capacitor are c99bg;4eab0q nty7m vtonnected 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 j8n w::pl:o3a pjiqen6;cmf .a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is thep3:n aj 6;:c8me.q fn:jw plio 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 (4j ,j;pq*x5m xibki -w6m efd30 W, and an inductor of inductivejjkx (dq ii*pw4mb6- ;,fmex5 reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a ,)wr1qh/h .txmd hsd150-W resistor, a 10-mF1dtdh/h. r,)m1 sqh wx capacitor, 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 a 500-W resist9f8t gakd48)bbh b6 qzor for a phase angle of 4fbd86h )qgkz b 9tab8$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L t*z,)(lz(t,uu(4 z nhj imooh= 200-mH, C = 10.0 mF. At what frequency should the cirth, *hl((o4,j )nmo(z tzzuuicuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac serie1muzcvqte14) nivqllr* r9v gnh9 nuk82,(k +s circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power suppl1lr 4n *evu8l2hnr q)gckm9+vuni9tz,v(1q k y?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit iu6dem/68l vur s $63^{\circ}$. 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 60zayijzg0a fw0c9)u3n :mmuof 30 W. What is the powernwj0 0 gaamzuyc0)mfziu963: 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 ser0) ek g2e. so,pvmd,d 2nd:szyies RLC circuit containing a 50-W resistor, a 10-mF capacitor,) :p.,dn,0o2yzs dvme d2 kesg 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 frea vkd.:/)*cb9 kka5v2/gjfs xgqd ba,quency of a 1.0-mF capacitor and a 15-mH coil in series?s5gkvc dqk.dj,) /*:/2bvgkaabx9a f

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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 ser,7jc k 0zgj5mnies with a 4.7-mF capacitor for a resonant frequency of 10 kH j5zg,jckm 07nz?

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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 resona5*2oqx 5ye t jqpp3s*nnt frequency e5yxnt 3oq5pp*j2*sq 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 placed in series with a 30-Wnmm).gcnk2 f5o2c w ,egnp78p resistor and a 40-mH coil if the resonant frequenfk7 .p2)c wg5e pc 8gmno2nmn,cy of the circuit is to be 1000 Hz?

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