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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 magnea;t jj ig4gj() n4os+d *m2codtic 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 )hd/l,fghg6qw 2 +utdthat 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 w 8c.wgm3db2ch y cq1o1y (ik5oire in a coil produces what kind of change on the inducedo 3c1do qw1ykbh (85cyci2.m g $emf$, 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 producxn,tsn x,ur 22es what kind oux,rs t,n22xnf 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 pri -0h63x1fvf4;(pn6u7j3j7 tg d nvo smesmthoduces what kind of change on the induced j 0p6snj vt6h3u fei4-7x 1omvf3gm s;h ntd7($emf$, 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 m 9 5zw4:3a4yg a)q odnw)cfitaagnetic 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, thi d.ghudm 1bwm z9.;f.x*.lace direction of an induced current in a conductor will be that which wh. 9 g ;lxdm.u*a dzb..ic1fmtends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held aboveqt tz+cd. x2o2 its center with its north pole pointing down. Thoctz2.d 2+qt xe 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 howj. , 5q;d*m h qla0rlw(1ngcjrizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above1.*0jldwlq ;gj ,h an5(qmc rw)

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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 1fmx4g.fmrzft qf6;z * xn*v-vector points sm4f6 ; xzn.fvx- z1fq gf*rt*mtraight 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 a region where vj fs1 ()uvbyt+ 8di1 ezi x1r6-7czsfthe magnetic field vector points straight up. The magnetic field suddenly grows stronger. Whe7 r)z6-11(te+vjzfs fb i s8xic1u vydn 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 /f :z*ykva/pgi)2jbxdvff u8tjz4 ; 7top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of thdbkziv;f7yt) jv /:fu pg 8j*f4a/2zxe 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 anu rdnw*z++ ;kv ever-increasing current northward. Two coilsnr;k *++uwvz d 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 througn v8 sk (grpt4a r*hmi53k2r13u( rmpjh a loop of wire with the north pole entering first. As the north pole enters(r2a3hr8spk5rku mj4g v mnr(it*p31 the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about 6kmn;c1 ibdd,an axis whose direction can be varied. In a region where a unifon,dc6 mdi; 1kbrm 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 a5shc9dxd wlkeq;6 (e- xis whose direction can be varied. In a region where a uniform magned6c5esx(e9 wdl -;kqhtic field points straight down, what 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.c4j,8 w,ur +oi0 yac/xba3onj6/g ejw
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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 afe azwd*i0u12; zo 4qen $emf$ 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 ic0ap +ot*zi74o/ ciyfield. 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) is moved northward at:5rr 8b4ih lnk0unp ,u constant velocity thl 8ubi0rkr u:5pnh4 ,nrough a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant aped l 4l (9wxorfsw.84 hr5en8ngular 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 trpj 3 flud;v,i2ansforms

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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. x((+d cmtde.x6 ewyx 6 The frequency of tht ( +.y6cd(dmexw6exxe $emf$ 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 devicy3 s;yo+/ : p4wncnhvpvk7gu3 e 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 deaeaa2wq87-m6 j42bi u,zsx0gd ;qk olvice that

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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 conta6pc)o f08z9ubwqafh5 ins more loops than the primary coil thew)o apzqcf6 f985h0bun 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 co8yifte 9g0nbmww 6c1*b j5 6clntains more loops than the secondary coil then i61 8b0 6bc *9fwwl5 yegjcnmtit 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 7kzq*okf+gz / 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,1p6j(f3- r,jn) n4 dglzr2ifd a :yctb

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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 (bsfg- n5h le+series to an ideal battery of constant terminal volta5+flbseg( h n-ge. At the moment contact 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 inm :j+.k e;ylcpductor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the indk;ym e+jp: c.luctor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and mj3b b9fbh851hf4 xwiresistance 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 j h:./q ejv /q+mll.vbR is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in se )sl0qq,x amnsy3;5mg ries to a battery. The time constant for the circuims lq0sq 5yax3,n)m;gt represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a batterfb1nftji:7:g ,a6+ y8yuoi9y bs:m rty. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required tiy rm:b 8 b+y1 fa:t7fgnjy9io,:u6sfor the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same unikq4s+9hju1h g n ab*s.ts 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;lw kfqlo p*fw2i6 5s9k,-ynu an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to s32ktr8uy u4j; sl ia8l/l 9zzan AC power supply. In this circuit, the curren 9 24s88ji ztu;urlklszl/ ya3t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactan9eyrca2 bo d5sf.to (yo*wbz2m /p0+cce in an ac circuit changes by what factor when the frequency is trim wdz(2brsf5yoy 9ec *bc0 t+ 2oa/po.pled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the p+(ntyur 2zets,t1 f1* e7aweinductive reactance of that inde,t1 t 2us +z refenty7pw1a(*uctor

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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 approacg;i lq*j, 6/ uoyax-ay(v6x *s wzt5rahes zero, the inductive reac(i tu/yv;w,6 s z r*6ao5xaj*gly -xqatance 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 pi9 ah )v0)cf(isd yd1mower supply. In this circuit, the curreim1fdays cihv )9d0 )(nt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactancema9edu8lauq6dhv:f / q2 e84j in an ac circuit changes by what factor when the frequencjh ual82 / 4qfeudde9:86qv may is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of thej7pmmy9ts*g (eon.+ c AC voltage across a capacitor approaches zero, the capacp*j+ng y (.7ocsmm 9teitive 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 betwee xg6l4:q;bgu xk, mp2bypi)/bx*e7 zgn the voltages of the inductor and capacitor in a RLC series cilx;7egixpm bxqb 4 g ,6uybzg)2/*kp:rcuit?

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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 ci zkz dx6 50u0)dhhbdf+rcuit 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. Thsdn :qnoxdg(m .nc . g8s4+q)fe impedance of the circuit increases if R increases. When is this sq.gm+ (onn)gx n:fscd q.8s4dtatement 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 i53zx vtdrmymu3w : x:(mpedance 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 inc0p9c1rvf+psva8 (rpcf 90qlereases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an, y2xd bstx2 lg6(s(jp* )grdn LRC series circuit, the resonant frequency 2dl2 g(ts*yn(6x,jxpgr)b ds 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 )8ta glzr *fj* sh-4ypAC 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 occut;fjb:q xald ljw8.8o.(wl9mrs 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 pr 3n0pfi:gol.l6ct55fo r3s field of 0.20 T. Find the magnetic f5s563r .r3pfftcnpo :l0o gillux 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 rotatitz 8m4qu/pis h 50 s9z3scmpo5ng in a uniform magnetic field of 0.20 T. Fiz 8s m 9phi qz4c5/us0o3mpts5nd 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 in a uniform magnetic fier5 ed0 (v6tobat /5kskld of 0.20 T. Find the magnetic oak0( k6v/t trs5bed5flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional a tj;fxx6gy*: lrea of an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes fro,n*,5ablt swi /3jaa2ocs3udj7p r6bm $4.0 \times 10^{-5} \; Wb$ 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 squ0lnt0s y2f p6wnvuq70 are frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly nvswpn q 00 f70uy2lt6from 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 area7 hnr4mhorxckbk9 h3q*5 z57n 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 arlx(*kc.ul0spnyyy93u nw45 - t yuw: hea $0.20 \; m^{2}$ 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 a8 k ku+ijurb;1t a location where the downward 1ikrk 8;+ju bucomponent 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 cobm ka3 z/0dkw nnzxlw-a/ q4 mdme5:1bv5:n .wnstant angular velocity of 2.0 rad/s about a vertical axis throu1- k a5:d4nz/ .vkeb5 zmw3andmw/0 bm:xwqlngh 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-sectione* vjex8qc 5o8al 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 1dvcjs797) v sd00 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 armature. Each loh 5/:x xwq td ;,dnj a,6mika/ok:v.oiop 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 0.3ko x::/iad imx. ,5vwjtn,oadq6/;hk0 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 tuv .,xf iikqt41rns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator k08 ;gmu3krx;ien7/amtbzi*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 thzu0ktxai*i; m /; 3e7n gm8brke 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 gt4kb .liz)) gxenerator 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 resistancez b0x hk;,u .9i1 zj)tqiim)lu of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of151 z )si;v*n37z m 1 yxnkvw(xelbuyz 6.00 W. The motor operates on 120 V AC, and when runn *ey1)vx ;zn1xv 5n1 bim(ws7yzk ulz3ing 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 redh r urclf-sx/8g6e1 )sistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. Whatdru 8lr16cefhg sx)- / 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 supplmr( yo ,ph8q5gy. The operating cuy q5r mhp(,o8grrent is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply.:7d iamb i jmjz*.;ol5wey -2v The operating current is 1.0 A at full speed. Wiy 2jz:l7jv*b a ewoimm;5.-d hat 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 voltage o.ig 26bvvi-/fow*fsd 3 n fnz6f $120 \; V$ 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 ,yh5 8t0viww bcauses 14 A to flow in the secondary. How many turns are in i 8yt,vbh0w5wthe 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 necessary in a 110-V primary if the 275ar1.hnmp h+w) wjuk4-V secondaryrp)j uh+7wk hn5maw 1. 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 o sxal, 80.0k:itlsym8c h tyo(f a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3,oh ta8i.y80cm0 kxytl(:ls s.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 t0s wk t sws1gy;iy/adbf3oe+0zc7-7g he primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the s/bi0a1d3c77- gswg;s ykeof zt0syw +econdary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. Thx-scke5: k3h ze primary coil operates on 120 V. What does the primar 5ekhxks-cz3 :y 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 hdwxfs9 wrnu(,y* 62hyas 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied *xf(y 6ynh ru2dw ws,9to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 tu5 l7-ug:oiow svt8qr 1d.2 z2tikg 3msrns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, whatmd r.o:u7g q2i5kt8gvz2s-tos i1wl3 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 transform4hke 1gnxl a02er has 100 turns and its secondary has 200 turns. If the input current at t0 1 xg24eaklhnhe 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 turnsu x43 zugey,g/ and its secondary has 200 turns. If the 3gg xz,4uu/ yeinput voltage to the primary is 100 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 d t7yh;l9;9xae.y*.zls ktuthas 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictionalu9xed stt.7*ht ;klz9aly;y . 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 voltage is usua83dw-z+i4qkn6w gx pm+k 1nqw lly stepped up to 4500 V by a transformer and transmitted through a powe -q8x iqzk +n wkmwgpd463w+n1r line of total 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 currekl. b0ckrjan.vyktq 1p 80ea4h)19s* naxst(nt 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 percentagjn a 0bx 9.(k14env t)0. cakysar*l8tshqkp1e 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 c8 or-jb ; sjs5t9vf40m moctitl,-ja6 urrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a pjtvl jr9o,t-aso;m 8i0sc5 bm4tj-f 6ower 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 .z az9 f(pt(horesistance 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 voltap (ha(tfz.o9 zge is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission lijh6w11hrox,gv o .s-kne 50 km long has a total resistance of 0.60 W. A generator produces 100 V a 1rs kh,1jog6owv-h.x t 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. H(84tffw zi npopouv45-;.vg sow much less power would be lost if the power were transmitted at 3000 Vp (vn-4o8tgf5;su vzi. pf4ow 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. It is to 6ip 1rj;wl9dn /g le15 -hi, qo/iequkbe transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped eoi/k;h-61i l/e5 w9 ln1dqgu,r qj ipup with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stof8fl(;x rsh 7mred in the coil's magnetixfm fs;h7 (8rlc 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 resistor and an 18-H inductor. W5i 4my-k6/iibf*f2vt f+ lhy that is this circuit's titff5tbkv*h yfm2 l+ i /46-iyime constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC ciz kras-1ba4e9l0;0 zlbkxsdwt2 r 46lrcuit 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 120-V AC outlet. What is the peaiqqb q,j1r *6u(o+jw pk current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. Whanyb/)fj t. d9vgra2 g)t is the resistance of the lam.t )r )vd ga9f/j2gnybp?

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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 pea(y :zgaqxd) z6k current through the resisz dg)(xyaz 6:qtor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power suvd72mit -w7//bk ):v y ngdhkupply. What is the power dissipated in the resiskdv k/t:ygn27)bh /wmuv-d i7tor?

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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 resyae k ,/7;/fpdj +ijapistor 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 resist.w;h2u gdt qendy6l86or 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 rex7t y ;/lffr;8ow/m nqsistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at8ujuq sv0g 3of*9d y t/k(kng, 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 101i .o -vd0pssivhl6hkz 3r5e* 00 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 inductive0ni )i6cwudj5 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 15x:0dayq k6 uqx- gk8c97 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 inductortdwszx3p -/2 /vm,*fkfgv9 nf when 120 V AC at a frequency of 20 kHz is applied to it?-2 v fm/n9g k/swdtf3z*fxp,v

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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 ()u hkfye r1s9due 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 reactance of a 4.7-mF capacitor wx ,5 tub /+mby/(lwdpat 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 50e cv3p*fu 7es1 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 capace :;waf 1.ypzhfg5 fd8itor 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 reacta, :;mx wca-yvdnce of a 0.010-mF capacitor be 100 Wx;cvm,y wa:d- ?

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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-mFwri+j).nqbfrawb, cr01+0srpfr9 2y capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an a/mdc rf,/ /rrz(w crw7c series circuit with 12.0 W resistance, 15.0 W inductive reacta m/,/d/crwcfr7 (rz rwnce, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil,wq:f54hvh g9p-fe zvx2ps 14 z and 1.0-mF capacitor are connected in series?4vzf4v 2 xgz19epfq-s w 5:phh

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20- tc 6s;b/7htvtmH coil, and 1.0-mF caps/6b7;t vtcth acitor 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 /r0l;qif52z bejntc7 the im5072tqrfj l/nieb cz ;pedance 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 connected in series with a 20-mH inductor, what is the 6lcw8 dbfj:8s phase angle at8lcs :wf 6j8db 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 series c7qol 5y+:3g(k :qj r ufaomg8ty n3pe)ircuit with a 20-mH coil and 1.0-mF capacitor fyj :5 r+(qog37lyf ogt3m8e:n k qua)por 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 series with a 100-W ,9y2w gih ktv+resistor and 15-mH coil to get a total impev+2wy,k i t9hgdance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inducth j+nhdys 60x7or at 5000 Hz for a total imped+ xhh6jys 07ndance 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 resistor at 1.0-MHz fo54xkkqzwa7qm;vepy ph 9 .* )cr a total impedance of 1k pwv ;qm.xychp*5) 9a7k4ezq50 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 a1g4,edpxu ntl n 10v5d 20-mF capacitor. What is the impedaexnug11pd5v4n ,tl0dnce 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 needs:lw,f oizs(ey7) b;giae52oed in series with a 10-mF capacitor at 1.0 kHz for a total impedance s,: (es)5lo;iaofeg 7 w2ybi zof 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 ftw 8l0 czvc ul5d:+6vu 4vrw:in series with a 10-mF capacitor at 1.0 kHz for a phase angle of vctwzr:f6luv u0 c:v 8 45+ldw$40^{\circ}$?

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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 resi. w*x+pp0 lbkqx vn44istor at 1.0 kHz for a total impedance of 45 W?4 *4k+.0nx vpx blqpwi

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is the ph9d;qjb-ustfy;. rx 2v ase angle;xrv;fy2ju9tb -s.dq ?

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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 a0nw 8kfiej+2wnd 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected i w2j80new if+kn 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 yjz:;7y1 yr1gt0ppjydjb u +2resistor, a 10.0-mF capacitor, and a 0.350-H iy1y p1j jpgb:yy r7+ t2ud;zj0nductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capw, t mc;p2i-qaf9jty2acitive reactance 30 W, and an inductor of inductive reactance9 t- m;ic2pa2f tqyj,w 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 50-W resistor, a be67g+r5*/diaj qw +e 7jurlx 10-mF capacidrajxli + w7+ eerub75j*6g q/tor, 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 nen1rfhq1 l/s(n(t:ex xau1l9 fcessary in series with a 500-W resistor for a phase angle ofx/e1qlfua1h1(xls ( :nt 9r nf $40^{\circ}$ 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 what8+vyb8p c r hq9(t0d. w2idmns frequency should the circuit be driven in 8m+d t9 indcwyrh 0 82p(v.bsqorder 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 a /b i*8b8pe pn*vah d:/qqsv)ftypb1 5c series circuit with 12.0 W resistance, 15.0 W inductive reacst /yq)vv p8in1p*f pqha5b bbe: d8/*tance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC c*c- 3qkjpyx :mircuit 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 f*xd fw+-o. ecmlgk -fbo55nfgo9 9i(impedance of 60 W and a resistance of 30 W. What is the po (xo -fw*+g-elfbof9 fk c5.md9 ngi5ower 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 circuik3h4czbvzn2* z w+ z.n:gr55k6amq fst containing a 50-W resistor, a 10-mF capacitor, and a 0scz :3zb nzw*ngr.z6 5f +2hk5vmkaq4.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor ans-) k0f ovq w1oq5hb2hd a 15-mH coil in series?1bo20hqv-wf soq5 h)k

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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-mq-3d;n-8sm:6 gyzxwv f/g g2dviij9rF capacitor for a resonant frequency offr3d2isw;g-d-q i68g 9mg:v zv/xjyn 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH sip gxh4su3p x:9um/lc:qf8) inductor for a resonant frequency of 1hcxum89suq ixl:gpp fs/4:3) 000 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 9adhutb*t9*)jin3u ) mq ;ixoa 30-W resistor and a 40-mH coil if j)*iqxmt )h *;tan9b 9ui3od uthe resonant frequency of the circuit is to be 1000 Hz?

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