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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 l4 wd2lxa) c ll+:k*kd(lk0jhunits 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 * zuq v6kj7g si.px 7f39huf7tthat the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil producbf 87y1ax6 beikk8c4jes what kind of change on the i8fbcb4ek1 a 7yk 6jix8nduced $emf$, 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 me v0k)+1jlwjwu y as87agnetic field through a loop of wire produces what kind of change on ts w7v1e0a)+8kwljy u jhe 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 produces3xboyhg9 w8 n) what kind of change on the inducedyxw h8no9)b3g $emf$, 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 maxnf65 8ms1 dargnetic 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 ulp1. 1w wz6-o.tw9+n3w ekznidnz0qinduced current in a conductor will be that which tends to produce whwwi0np6 u-z9wzk. qnd1onwt3e.l + z1ich 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 horizonta6kaqde2tp-uq m2vx )u5 wc .+xl table. A bar magnet is held above its center with its north pole pointing down. The stu-6k. vu+5 q)mcx2detpq w2x aationary 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 horizon7y*gqq b,7wzmq(mj y) tal table. A bar magnet is held above itsqbg(yy7wmj m*7, z)qq center with its north pole 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 in a region whe6 j/3 s tln9o+ klajiucj,:5mrre the magnetic field vector points strjr,m9 k5j +nl:lic3ot/u jas6aight 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 table top in .lnp.qq 7 qpp8a region where the magnetic field vector points straight up. The magnetic fieldqqppln .. 87qp 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 region wherequt1y )x h buaj14shhe 2-+b2r the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direchh1h u q2yxr4b sbt+jue2a-)1 tion 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 lie;bq 6 , ypw7m: -)ad:+ayqviflfw8fo5b g )kwes on a horizontal table and carries an ever-increasing current northy:f)wf+q,l bqigkafwbe)p7;aw 5y-m8d:6v o ward. 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 wixo a-*nzm0.pal8gk*rth the north pole entering first. As the north pole enters the wire, the induced current will br*p. x*lkaz-ma0 8gone (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 rotatedm )sp54ahl1 /t/pqzpl*twysl28 r(p ab l, :ik at constant angular speed about an axis whosealys/,tmqstp 1lkl*4 bhz():85parpl /2p w i 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 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 angular speed about an axis whos *:58cb-gaeisc.cu q odox0od h2r9-de 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 indocar09id ug .xo25od:eschd -c -q8*b uced $emf$ 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.j b lj)rx/jmvx+n /g67
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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 thlkq8fh +q4m10: z1gdo 8dbq kzmohv,5at 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 fie3fwa fv.k,xq i 9racno/;h9k 5ld. 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 elk5wk rt9:9hreg;b;v ast-west direction) is moved northward at constant velocity through a maglr; btrk:;h5gw 9kv9 enetic 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 constant angular velo3xcv6h91 ey jncity $\omega$ 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 trad2uj9 /*rjig2 4d9xd0n ufgl 2xvy w8snsforms

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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. T.s g x6asa3gj7he frequency of the s7sga .gjxa36 $emf$ 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 tosjh35 i39n, nav/d/ uy zh+nik

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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 81 ywam4ppaoe k(u0: cthat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the primary-x e a)oeqyh5, coil the h5ey -xa,o)qen it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than thaq hi9,g5 -hqoe secondary coil thg9 5q,-qao ihhen it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power y ct)tjhu+n 4h(pu3;3pig2xp 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, kofp 22hsu;h:ggq 1a9ijh:v ,

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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 indugg ase,ttw:0+ ctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made ,esag +g0 w:ttwith 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 in series to aiwy z3o- +amr k-x(ih;n ideal battery of constant terminal voltage. At the moment contact is made with the battery,zy rm;+ah3--x iiw(ko 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 wi 7-q;xadua3etp 8/ o eyu(r-bith 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 resis3/cu2v per remb-;9cz tance 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 ina ;f. zhlx7h-5e5 yfv syyop2* series to a battery. The time constant for the circuit represents o eh-7syf 2l;xvay z55p.yf*hthe 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 w): xfe2i.l6*yvb.ciwj cj 0gare connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time r2ej *xg0:c)j wcbviil . 6w.yfequired 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 haveuj(j z+a sib(:u tjmbhr,orsyy0 ,**; the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supzz z jzjas+2k: vr-*5qply. 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 3.guh-(w er)su9fm+zwxp l:rto an AC power supply. In this circuit, the currentu : - m.3w+prgz s(ueh)rwl9fx

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance iw) z0n7 o2pkqb8c/uupn an ac circuit changes by what factor when the frequency b ponuk07wp u2c)z8/qis tripled?

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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 indpnk jw/e836nkuctor is doubled, the inductive reactancnnkp8 / je6k3we of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an indi66hcq1:cssj2l 2v c) fvof;g uctor approaches zero, the inductive reactance of that coil l6ic 26 fq1cfjs;:v)gc2ovsh

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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 si66itg y9a8rc upply. In this circuit, the currencia8tr 66iy g9t

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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 dxok1q fp*fsdl, 5 y:m4u-tc1dqxe 5/an ac circuit changes by what factor when the frequency im5y e f1 *-fsp5dt l xuxo4dq:dcq1/,ks 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 capa3kxl9v df3j7m citor approaches zero, the capacitive reac9 d3 xkvf3mjl7tance 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 capacitor in -a)dtka y0 9e, z7ijwia RLC series circuitw 07tae9-akd)z, yiij?

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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 defined as ;zevfi ux:woa3(hn 8edi85c,x6l ou8 $\cos M = R/Z$, 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 im:k x:-)3cr, ccqg xluncreases. -k:lcc:q um3,xgxr )c When 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 o :lm tz0a8b syt8y,l8yf 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 circj7ukqg:3j vp ;uit. 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 b3y+pu,)ugmkk8 qf*, xx u,hjdouble in an LRC series circuit, the resonant frequency of that circuit fmgk*hpxyu)8kxb ,u,jqu+,3will

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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 appliedc22w addsy6svou,m g (:vfh,4+iykj: voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a serieshj 2 te:zv1vgw ;-)yx6 r* 3jxbatr)nd RLC 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 uniform magnetic field a,biechhtj *.nwk,(y sz, :-f of 0.20 T. Find the magnetic flux a-n(,c:zhe, h jfitk ,swb*.y 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 finx*+ p qbch/8t0 qbqy8eld of 0.20 T. Find the magne *8/py+x0qnqqbb ct 8htic 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/ mytf5 xz(bd6 is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an anglx(m / bdz6tyf5e 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 adjuvc 0x0-*c 6hiwbu kh1 f3+hsaestable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changej;a ( wzcc2j,os 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 n8f5dfy7 j67yllnw,m of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes unif7lm87yld, f 5jnwf6nyormly 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 arq3+.ak 9mb/ q qutbxg-ea of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and are6i r vg mysw,lo+y9,x*a $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at d84v1 zttciv5 a location where the downward comp vt5d1 t4cviz8onent 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 rofr qj1qw+a wgl;d vk7 :6pkt/*tates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magne jvr*gq 7t6/pkwkf+qdw; 1al:tic 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 ;5iwdd1 at-m vcross-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 turne. j6u8ilqs3ss 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 itrvb4y08h:unnc h1pl1 s 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. p8yvn cb0 urh4: n11lh 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 hks ;k.76urtw,af3xbc vs *.k 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 sim3.j 25 sirqadu/c50sjj6i4f .dmjf9 0w kszzc ple 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 cofsfrci.0us5 2a5 .wj4d3k j0qd6ics z/9m zj jil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maxv//f;2( q, nkmcjlnwv imum $emf$ 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 opk,2a4x,*y3dthv qu zjxw0 ch )erates 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 s byj1iy-)3ni 6.00 W. The motor operates on 120 V Aisny )i-bjy13 C, 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 to a 24 :bytw 7*3j sn. 3al7yocxkwa--V power supply. The operating current is 1.0ya7wbxy3c3awos7:*k- l t j.n 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 su2p6 4s jyp8y-v9wm vzd z(rhr8pply. The operating current is 1.0 A at full speed. What is r -shm z(6djw82pyvp 948zryvthe 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 4kfcv8 j: 7s10m +a*bknzxtuhresistance 6.0 W is connected to a 24-V power supply. Thsu0vbf : zk4 1kxjm t8h*7c+nae operating 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 to reduce a primary 1o/s a+d0tzjn 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 secon dabz9z1 cb kobbf:4)4darc4dbo a)z49:kbzfb b 1y. How 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 turns are nece c l+wii7 )65t)m87z aof:eotr rykw8lssary in a 110-V primary if the 24-V secow+:raoo6w)78fi l)mkc5 8ezy l7ttri ndary 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 consis/c(rigg(6 6j .mjhd,z pme gt5ts of a 500-turn primary coil and a 2000-turn secondary coil. If r6( jc d/gg m5.tp,egihjz 6m(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 p ol ,hoevbpj- 3l/dw1+rimary of a transformer. Assuming 100% efficiency, how many amps 1w+ldv b/hj oe-,lp3oat 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign trab)pb,tbc ;rl.1d30eba,udt 3j x wgr6h/mjc -nsformer provides 7500 V at 10.0 mA. The primary coil operates on 120jm. b/6r3ejbul,tx,d -h)1 tp3cd0r cgba ;bw V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turrl wy2.r 39 pkvk)zy:jns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is lzyp9r.vr2j k)yk:3 w 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 coi4nr9zs(zh uc94o vei(l and 300 turns on its secondary coil. If 120 V at 2.0 A is appliehvsrei(n9zu4oz(4 c 9 d 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 transformer1 i.d +ncwgz hzm8p s5g;r,a;2rc+zt t has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, 1 rtcw nz;.;p+z5dr hg s2a,t icg8z+mwe can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secapgn;i 2* hrrzhz0 605+2xkhp0qdmotondary has 200 turns. If the input voltage to the primary is 100 V, we can expect o52*+txh2z0hiqrm6pkr d0p znag;h0the 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 20mni n.2u-7q*syc 4hkz0 turns. If the power input to the p-q 2yk7i s.m n4chnu*zrimary 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 o )d7*iqst erdb.szk 4(f 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 in the s d. ertkdib(s*zq74 )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 vobpxsv a6id1 y3v/hyis4,1bd /ltage is usually stepped up to 4500 V by a transformer and transmitted through avsy4pya1 b / id,shdi1v/6bx3 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 vo9kjt4h, ,g zywltage is usually stepped up to 4500 V by a transformer and tran g,4t9yw jhz,ksmitted 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 a total resistancesbjy b0mz48u fd7(rn) 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 z(j4n b7fubdm0)s r8y of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a ja9jmc59v ,jx 8l bob;total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heavj9b,o5c9x lbm 8a;jjting 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 wouo o-)wopwkdngw,30e ur-i y+.ld be lost if the power were+--e3o) wrk iwu0w.yp,gdoon transmitted at 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 generator is; ajt2x.f yl+e 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.et2 +;yfxjl 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 storeg3 ug1ef( v :d9c0ijtcd in the coil's magnetic field 3itccvuje9 dg1fg0(: ?

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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 inductor. ffn;(in qvu56 What is this circuit' n5 fvf(;nqiu6s 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 f4rpvy8y78t1 8eqkx g in an 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 into a 81t tn,igjmj v;n9lb nrh5qg (6 9mq/p120-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-Vp0.fea-mdd .2v wn0rnzv v+x2 AC outlet. What is the resistance of the la0vderw +n.2xzf0p2dmv a-v n.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 is the peak+ (fi2n9z- p2bz*chn6ypubsio 1 c*lx current thri*npohl21c(u*-+y 2 i sbp6zxf 9bczn ough the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ay2 bd:kstpmn4bh/ 5nnf8,)v rc power supply. What is the power dissipated in the resisn2hmybt8vks/n :,nf)5p4d rb tor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor iw 3mqg lrjo67+s $I = 0.80 \sin (240 t)$. 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 resk ba)5)rum aeb3y +;heistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor i: j9xvlfhu9y 4c vj -wo6kg.b,s $I = 0.80 \sin (240 t)$. 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 y xfx.,zqjca*cm: 8 )1*zb ymiof a 1.0-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 h-i+2u kp fu2jds4g-c at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reactancl 0)fiiyr.1v xe?

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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 reactance hol+;f3kv(yi30gr+yh *mrrn 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 inductorxp9*mezd:: vb6ep m+f*s. sdfh. (epa when 120 V AC at a frequency of 20 kHz is ads*d .m6pp+f h zseefep:9xm:.a*v (bpplied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz source/1jkkq+ o hpl4/ 4smdg?

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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 ca oo8i8ri9: gol* u1xfaz y*(gipacitor 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 nee(k 5fy.7p;k7yswttcz ded 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 reactance of 1bm mppro2s 4.l3x lm4b2og*/f200 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 0.01i2hw w-il56 f f1qais eu2d;9p0-mF capacitor be 100 Wedf;qhsuw6a l 2 w i5f12iip9-?

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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 capacihu ,k :xkei)fx)m /mk4a: ;tyvtor 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 rz8k csc0a(gnh f2; u+gesistance, 15.0 W inductive reactance, and 10.0 W cc (c0akg8hfnu2g; +szapacitive 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,q1q-1 m c)/ei rj06zdsqixbm/ and 1.0-mF capacitor are connectqb mm0/qci 1jzr1q)se6 /x-d ied 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 angle7yd*f6 lwu;jh at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacijhwdyl;*6 7uf tor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is thtw:65fz d /8rocyn eq(e id5/zr8o (ftynq: 6cwempedance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connectsm0 w qbv eq/vfafm/8l060. uhed in series with a 20-mH inductor, what is the phase a0swq a0 f v0.qb hf6m/l/muev8ngle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed i 6v 1dsn8psua7n a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance os67d1 a8spv nuf 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 series with a 100-W res: 2h 1 hgiu7peb3ofg3nistor and 15-mH coil to get a total impedance of 110 W at 200uo :h3 n7i 1gbe3fg2ph0 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 induc) k 8uj9yimi3 ul8e2ly0 lmsi-tor at 5000 Hz for a tois3i-y)k ilueuy2m9jl80 l8 mtal impedance 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 mustfn+tfh -vb ,nw2jn;) e be put in series with a 100-kW resistor at 1.0-MHz for a total imevn-w,nh +;j )2bf tnfpedance 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 cap bef pqhq3*pz1cqq/tn 3zbba)g+ .5*xacitor. What is the impedance at q bb1 qq)q3ah*ze+f/pzc5bx . gpt*3n1000 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 1b50yjz u1cl oxl 33ihvy/k( 3w.0 kHz for a total impbkzcwyyh30iuox33 1 /l jvl5(edance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for tp6m9c7 .nsrpvg .txk mx9(x)nc c9t.a phase angle ot (.s 9 .cgrpn9nmx9cmc6. ptvk)txx 7f $40^{\circ}$?

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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 resieta9ty icz4 wn5e565 5)qchyzstor at 1.0 kHz for a total i a5qc yzwt6yhcet )4einz9555mpedance 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 ( h,p(t:waqn:xzspb 5u)n w.z ;yzo3m120 Hz. What is the phase anga y:wtb .nh:npup5owz z(;m sxq3,()zle?

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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 6).olzt ye0dplj 8-wl resistor, 20-mH coil, and 1.0-mF capacitor are -zy)6jdpw0.llo8l te connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF prgd *5ftv) ffr*p9i8capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V,* r9f8*f ) pvpgf5tird 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,e*a 1qh zk cd. 5k(pwn1dk/)fj a capacitor of capacitive reactance 30 W, and an inductor of inductiv(wj) n511zfheapdqkkdkc */.e 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 circuiuxl n67l kj(.pt containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connexl6k .unj7(pl cted 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 necessary1er/eu tc y. bu6uhg w24ii:g. in series with a 500-W resistor for a phase angle ofh4iu/ .be6wr ugcy:.t1 2gu ei $40^{\circ}$ 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 = 200-mH, C = 10.0 mFmmhdks0j898 mh13*zler+ kb k qz(1zo+lf nx/ . At what frequency should the circuit be driven in order to have maximum power transferred from ts+9jzfel1lxk+1rhm q8 3*nzm(/zk0dk ob8mhhe driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resist /s520m j(ulewxd f5lwance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V pow0 l5j m2(d uxwsfwl/5eer 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 cirafvxd2 1 jtmlm1nk.)wa83d *dcuit 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 30 W. Wh jt6 4ff9bgusnr:5 -kjat is9jrk sfb:4nfutg- 5 6j 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 series RLC circuit containing a 50-W resistor, ac6,iumuu09ab 4o+mj2(o n h ad 10-mF capacitor, and a 0.45-H i4oacu(huamom i dju02b ,69n+ nductor, 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 capacit/2(, sj ppemoefusb6+or and a 15-mH coil in series?u,jeef 6msbp o+sp (2/

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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 serie9r, oa qw6p4jrs with a 4.7-mF capacitor for a resonant frequency of 1 4qa6r9ro, pwj0 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH induc jv1 o .vez7;erc*vtm9 ,lv*oltor for a resonant frequency ,9c;lej zrv.eo1vomvvt l *7*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-W resistorqz, i+x0jime*a g 8n*t and a 40-mH coil if the resonant frequency of zj8ganiq ex* 0i *+m,tthe circuit is to be 1000 Hz?

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