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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux except etm2gfk/04 jn

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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 statf9o yg*xmmfc.e o 80 z9wgdw:s,xf)k (es that 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 weu7 2oroi-. yrj47xfp.tq 53k vj sjg8ire in a coil produces what kind of change on the indt32-s pfgy 7v 7 rjeki4qr8xo.j5o.j uuced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire produawy1ywwgf n l125tpyue7 b q)b(k 9f:-ces what kind of change on theyw bnuf e1w71t)bw qyfl9p a 2:-(5ykg 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 r*gj7tt;6ts9 dlyqp 1what kind of change on the induc; ytl6t1q 7r9 gsdp*jted $emf$, 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 magnk0 y -nnxw6g4b5ui9og etic 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 jam m87gs7vn9 of an induced current in a conductor will be that which tends to produce which of tj97nm 7gm v8ashe following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magne acyjdo69-*9aix(-ens .f )tsi9l p myt is held above its center with etna9dy iyc-).9jf 6s 9isp -m*(ax olits north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontalh8*w3pf2igpo x 6 yr7m table. A bar magnet is held above its center with its north pole pointing down, and released. As wxho8m2p ypfg763*i rit 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 where the magnetic field vector:xpuwgjg ; *uw(/w+f n points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?fuwp;+nu gww:/(g jx *

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic field vect wfd//(2zf lnm9h;m gjfqo+6eor points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the indh9n zq+;2ewf6m o /d fjlfg(m/uced 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 where the magns/ 2wig.jf 0 re(ea-bretic field points straight down. The magnetic field dsr./2 -f (0arebgj eiwisappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-i/7x(i3h+ 0zqon)sbohuorxm0 ncreasing current northward. Two coils of wire lie flat on the table, one on either si7 z on)x/qh 0o0x+umb3os(hride 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 through7r5 vm.cliym1is q - (ldsj)m/ a loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed from a)(s 5lrmsl /m. cii q-jv7y1mdbove)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed absoyamvcb0 *92out an axis whose direct v9ay*mc2b0o sion 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 consxk v8r mm5kcri.ex- ;;tant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rok e-;cm.58i xrrv; xkmtation 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.14mospgqx ;olairjl6+f8x) 0qmvq6+
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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 pdyn+5sg:7j+ f ik(7tsnx6d x 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 ma9 op.:p3lk qcpgnetic 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.kc0 - i0atxqc) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concernx .it qc0ka-c0ing 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 cons(z/2*esi iqip tant 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 tr ,)a24c jiozik6q5 gypi71aj sansforms

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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 seat.48uxg6. ib , arimwcond. The frequency of the r84.wmx b6i.ai autg,$emf$ 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 g )n i e24wu8ceyp:,+ovclv1fto

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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 tquv 6m qjpr8;;w568q y.ns esnhat

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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 coei9;n u6/lxqjjmz ,y 9il then ,yl96 jjmqnzi u/x;9 eit 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 coile+vj0s u1+h-,8 d ijkhmd5u, wdaz d23epzt y9 contains more loops than the secondary coil then it5h,em9tv+dikz8 d0,w s3e2 jhy azdpudu+ -j1 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, theru- 4ii mh9my* 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 circuit,b7k 9soce n-exp)y2gt.i(eist 2s +4a

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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 ideal battek )gyx/vmvc5s0lo/he 0.7 pkpry of constant terminal voltage. At the moment cy e7vv /mpsok0) .5plhx/k0cg ontact is made 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 in series to an id8loiu 0hp4+wveal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acrh0+ou4i v 8wlposs 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 in),xfn cp2bt 62vwpq4lk b4zt-ductance 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 res32p sgz),rszq jkdtyyovi03r f 9)e2-istance 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 conned*3)9xh.c yw( xaejoncted in series to a battery. The time constant for the circuit represents the time required for the currenon jyd*x wc9(x)a.he3t to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a btbu8nqr3 y9n r37,ikgattery. The battery is suddenly removed from the 3iktr7un8,b9y qgr3n circuit. 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 hav // mke( ptxz r/ 1qacwkin3u3:icfq2v4ags (4e the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the curren3 cq:orp 6d7kmt

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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 t6l z,clzlr)p /sr2ts -b d,r-uo an AC power supply. In this circuit, the currentb u t-d)zlslsp,rrl/cr62z- ,

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factoy-d 9mwvja:;kr when the frequency is tr:v w;9adjky-mipled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubledct5u6o 2,gfs8cjbf v 0, the inductive reactance of that ibu8fs0c fov6j,5gct 2nductor

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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 approachcaewe m 5v(g1(es zero, the inductivevwmg5ce(ae( 1 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. In this circuit, the cuh*lcv5,/30l0 f ,fs eqklv1tany)nl mrrelv q/y fkvst*)e ,mnc5f0la0hn l,13lnt

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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 changeg6prv -n8b:* n +zynsn)3lkwh j,a i1ns by what factor when the frequency is triple8ni3-w nvar6hsy k *1,)zgnl+nj p: nbd?

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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 capac815s n/;-jl( jjhozx0pn1 cpnb.qtgq itive react ;c -s xpnj81bz0lgp o/jnhq 5tq.j(1nance 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 inductorgwja l(0a+o(p and capacitor in a RLC series c+o(agljp0w (a ircuit?

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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 circuitu7led9k;z7i0l5els) ,+ kpud 2 qfmjx 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 int.77 e mje twfiwk2y9-creases if R increases. When .f-ej w k9ew7tmt7yi2 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 circu 5/n cmkzz43nuit. The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit increases ikcnt; if ikep:2 (s(p mc*j)l byc.t+:f $X_C$ 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 capac pp+u0oyq/mz; itance both double in an LRC series circuit, the resonant frequency;0zoqpy/+mpu 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 /f,z 6jk agtzz 6)f4yvan AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs zpknyc d xg-28k(+j)fmub9- fwhen

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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 of 0w zhj04) h8zz j brf6aii6f;t..20 T. Firf8j hfz6i 4)w zazi.6;bj ht0nd 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 rotatixz- gn mqfd p:x/x99s8ng in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and t9: xf/nxgds 89pzx-mqhe 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 roz)i uoua,2gk4cxzvt17,+cha95woq u tating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the mqvoc47gz,z)t +1i a,u 2hoxuk5cua9wagnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is)k jcvx5 (6rww 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 tn64idc kjd.0e dslr.3dp p:;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 20rv6al/ * ,q(dvijc *pb0 turns 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 uniformly from 0.50 T to 0 d (lacrb,6vpqi *j /v*in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area of 83 aiv(ia;0zp)e3 ie;y wjaj f$0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns sl5 1r0w9::9ga sfk+ sgqwhbvand 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 flies horizontallykyuw x-v;k9a7fd.f ;e at a location where the downward componeeyxw;u.9 vk -d ff;ak7nt 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 ve9ow3 eh0iy :n7h-fo/tb q5kcblocity of 2.0yecib: 0oq573hfwhkt/9 n o-b rad/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-sectional area 9(g6 yw0jk djbq6meb3of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire) xicw8e+md6 m 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 armato. mta rw7c0d1f(x0 cwure. 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 p 7xfwtrd 1c0a( w.m0coerpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of arf np;gul95l 7j*2uimoea $0.090 \; m^{2}$ 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 simknkae9j8kk3-ea p b14 ple AC generator with an output of 12 V maximbak43k e ep8k jak1-9num when rotated 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 gen lke0 /+5/r vylooe;hbc /u.bterator 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*r8 ppe5i vap6qle,j0 $120 \; V$ 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 res*n p mcclj:vp.3pk6aibm5 o7f+9q ,hsistance of 6.00 W. The motor operates on 120 V AC, and when running at qb:o. minj9 chm*pk7asfp,l3v5+p c6full 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 supplbskws*pa46n4l:e 2 rsy. The lkspns246esb: *ra4woperating 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 phf+2iu (qrfs jv,nlr; iab:7*ower supply. The operating current is 1.0 A at full speed. What is thesnju2 +*fr,i(rl ia7qhfvb; : 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 43 ig;wg+op0eht7lb: hwio. kis connected to a 24-V power supply. Thko7 p 0go w 3+h.t;eg:4ilhwbie 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 transformqt7 f rghd.s e-w;(9eq7s1bcbx w( 9ouer is needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes m mfgs(m+onwu306(eg14 A to flow in the secondary. How many turng+(6mu 3f(negm 0swoms 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 amdxiib 2 1ys/ j hb+ hw2-u-8qk,iz4wmany turns are necessary in a 110-V primary if the 24-V secondary has 1j-diw228 hwx -sby1 hi/bak+iuqmz, 400 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 coijgfk9x z 2ird 19aga(y ;fmj f;g,1h9ll and a 2000-turn secondary coil. If the current in the secondary f g1rjh,9 fy (9;gl m;dix9jfzaa 12gkis 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 transformer. Assumw rug33s3 d,it4f+c.gk0qsnaing 100% efficiency, how f4w+a 3nq ktdg0gs3s3i.uc,rmany amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V alf( )8y5 vav*c;g- an;wnnr p g84rmnht 10.0 mA. The prim;g(c 84h my)afnnvr*a vp-n8g5 wlnr;ary coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary conen sr tm2lk+4 h.4vb1z+ ;gnqil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is rgse2mnlqh z+nv;k4n. 14 bt+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 tur )ra/7 fv(cza.6yr ntxns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?aarnz 6)xy(7c .f/ vtr

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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 secondaryqb:n.35.;t yd6ly6 o hprtcde has 200 turns. If the inprt.pl:n3;yyt6 dd e.h5cbq6out current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns ahoagt ugw.0(+ x pc8x9nd its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect thouwagx(9htx.8+ pgc0 e 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 seco6l/ g,tlu/)+u0 hm xot,n bigtndary has 200 turns. If the power input to the primary is 100 W, we can expect the powobthn+m/)t /xlli,u 6tggu ,0er 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 120 V. The 7 8zlx liqi vwqn ./+xv1aqi ue17k94zvoltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0qvx1 i49xq/uq zki w1+ 8n.llziea 7v7 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 il r5x,;lb(e7qf+o teo s usually stepped up bto7, o+lxr;qfe5( el 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. The voltage is usually std n 5h esv8)fep a1,xsx58dn/uepped 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 not stesd5un,v) hpxnef sx5a1/e8 d8pped 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 lohzs wvu n*gm)cqk-1a 0 wp/9fy,gf8s* ng has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lowczyha-gg** /,u8n p )skfs f10m9vqwst 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 longg+sw mp w/bdq(j;0 i2t has a total resistance of 0.60 W. A generato/p(+;jmbigqtd0s2w wr 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 pn s4u k *6 yzy) rq-hbt1nded.;wmybfg2p70 f7ower would be lost if the power were transy4e d*dsnh7m2 br0.-;6zu7gnwyf fk1 )pqt bymitted 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 440 V at 20 A. 7sucy cn ,ky -o,qu7i3 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 theyqon3-u yu,,7s cck i7 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. Hogv3 dgb)is 17hw much energy is stored in the coil')7hsv igb d3g1s 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 a9)f/4qc tr xxx3:h zxd 6.0-W resistor and an 18-H inductor. What is this circuit's time const xqxt )r x4cx9:d3z/fhant?

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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 tvd ,fv2tgwmg2 ,uw- +3 j-cdfwo2 de/phe 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. Wgowj8xk)2j/db .x g 5 xus8;ycf.fl5s hat 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 int rv/;f) mlz7 y fh*oebfgt.oz0n :s3;fo a 120-V AC outlet. What is the resistance of the laf ;zo)0 br* mf7ns tvgz;.o/hyelff:3mp?

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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 conne 20-jwvh7 serbcted to a 120-V ac power supply. What is the peak current throug0 7wsv-b2ejhr h 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 connecq2i mzi ;ayo 66p2xw.hted to a 120-V ac power supply. What is the power dissipx.oi6z62hm2 q w;paiyated in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is7i; r 1zfui82kznga2 m $I = 0.80 \sin (240 t)$. 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 resisto v.s21;xg6 gb5yyzjt cmf.b 6yr 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 resrird ihhf + zs*4/d x: 0eqau/.t0s8edistor 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 cwjea7 ztgj289co f,u 1)40tvj8f axoinductor 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-ev8qbhv m rb3n 3*se*.mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of induig rn(2m/o4ha.zul7-giaa 2 m ctive 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 reactance at 1000 Htke ;1rqy*.gzz?

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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 induqk h8q+wb5u+ -5ngjk cctor when 120 V AC at a frequency of 20 kHz is applied g8-kj uc5qknwbq h+5+ 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 thro b3-.znk,o5roo/gcr gugh a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive:k,kd*at v.1jvvl5 mzksa17b reactance 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 haveaq gi zj*/biva*-q og;,v,* en 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 )f gc dg3h3lp:etgy 2ul(2qp5 a 10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive rea(-oayywk r- 5mctance of a 0.010-mF capacitor be 100 Wy5 -a(- rywomk?

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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-mgsnshj 19act6;:9ofbvf 6tpm3. p 1hlF 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 akfgs*r).qy9ze , hd k5n ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 Ws,) ryk*zkd9 5 ehgf.q capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH c1ohajq/bwe/l y)pvsg b*nlk4s/+v 89 oil, and 1.0-mF capacitor are con/p9hnq/ va)l1vb+eo* g s8b s4/wyk ljnected 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 1508 zpp0cgph8 r:0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are:zph c80r8ppg 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 i10c xn:ol1 lb5dn hg-is the impedol1nxc i -0hbn ld1:g5ance 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 connb40(s hzg aau3q+ya.rected in series with a 20-mH inductor, what is the pg 0ay+.a hr ab3uqz(s4hase angle 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 in a sea4qf *: zcjo* -ex zd0seee*+x+ rdt;hries circuit with a 20-mH coil and 1.0-mF capacitor fz+: aeh*sdc;efxe-xz*dtj* r +o0q e4or a total 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 sery1cve/,y:j,.u.rekk4lvrh ; ktikn )z;zr b.ies with a 100-W resistor and 15-mH coil to get a total impedance of 1 ty.zkeu e, ;hvcv;r)j ly1nk 4,kz/r i.b:.rk10 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-mHn+51 ho6ewzfogaqh8qr*xd1 ; inductor at 5000 Hz for a total impedan+g;aoh6q8f15qx znr 1*heo w dce 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 puesoyb(d6 q+c h6zz7 . ihzkw6*iq/te2t in series with a 100-kW resistor at 1.0-MHz for a total impedance of 150 kWk6h2cd zqb76 th.zeoq*y w6e(zii /+s?

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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 the impe)(qpgs -z:kqwap+q o22hrkxa (brk w,k3)i,rdance ak(qwgprih2osqr: b3aq-kk,x()k)ap z ,r w+ 2t 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 1.01em)6 q naray.dwb;,g kHz for a total impedance of 45 W1ey. b6g maad),qnrw ;?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needx9 kfzo qgh4vm+x2-b.je 3 5deed in series with a 10-mF capacitor at 1.0 kHz for a phase aeg 5-ko +.9j4h x32fxvzmqbdengle 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 resistorv,e;gi )t b 6hurs3sq: at 1.0 kHz for a total impedance of 45 iesr;)sqvh,6u:tgb 3W?

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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 12ks3mi9 di.w/kli2e s*0 Hz. What is the pha3si/i dk9 s* wmleki.2se 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-mH co6eyyd qo) ie61z)8; u0 uwcmonil, and 1.0-m1dui;6c)z q 8woe0ym yen6ou )F capacitor are 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, akcs57q s l*zn x.4us1m 10.0-mF capacitor, and a 0.350-H inductor. The circuit is c 5*cmnus. sskl 74xqz1onnected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and aboo( (kusz m9 0lg3oje( m6+wfn inductor of inductive reactance 30 W are c0 9 f ko+( wzs6obe3ug(mmo(jlonnected 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 crzs8y) nv +2attd qb23ontaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power sz b2 +8n r)t3yqv2datsupply?

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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 r b4;crv1)bh bphase angle or4b vh;) brb1cf $40^{\circ}$ 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 mF. At what freq mj9ppj tp0 1(uwc gi*fpzg8n*.5r2dauency should the circuit be driven inz(.2 t0w*5c *j na8jrmu9 pfi pgdgp1p 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 series circuit wih15 /e0yltv ehth 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the ciry1e 0t eh/lv5hcuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit iw m6 ju4tmuy*lxm 4vuu /i5cr;;9 )yeus $63^{\circ}$. 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 impedancrw.eefd; ev l j07)m-be of 60 W and a resistance of 30 W. What is the j;m ev.e)rlf7de0b-w 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 seravrnj d4.9 6v guhfkve;jt4q 99i2 /pjies RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power suppljqvpjkv a.i94vj; /eg49fn2 ur9h6tdy?

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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 capacitor6e)lv zp-wyho: ys-jy kzh3 +. and a 15-mH coil in series?+vk)e jsp3 zho6-:y -yhyz.wl

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capaco.q m2nv /fy/rgu c5l5* x/otxitor for a resonant frequency of 10 kgx u.2*vxootm/ lcr / fny55q/Hz?

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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 i v5iwf1e ; b0op7 cz2ba,rf.kyn series with a 3.7-mH inductor for a resonant frequenpbcie7aw ;ff1byo2,0v.zrk 5 cy 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 ao/s x v3n0s:x/pfs9 oi 30-W resistor and a 40-mH coil if the resonant frequ 3:op/sox sfnxi s90/vency of the circuit is to be 1000 Hz?

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