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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 areo0ej ebe* trw1( z0zc1 units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of inductivd1 -zmlws) j6on states 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 lolt jhk; vyp5qsqc9f d(/t5* j7ops of wire in a coil produces what kind of change on the induceqy 7k*lj;t(9c5 stfvhp /dq j5d $emf$, 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 fielrgy2 psocvlt8(4f,wp(x6r7bd through a loop of wire produces what kind opy 4l v(6,cfrw 2gtpx7srbo(8f 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 o7 m9i2z6aogd wire produces what kind of change on the inducz6ad 927gim ooed $emf$, 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 magnetic f)1 6-;rw*l qznzf.x vu5al dhtield 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,wj 3.ra.bm(yk the direction of an induced current in a conductor will be that which tends to produce which of the following em.k .jabwr3y (ffects?

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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;go -wh 0vlra6:qb j7a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when 0j6 7;h qwlvrbo :aag-viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal ta tmhe::v ao u8-;sl2qible. 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 (wuv aemo :2hlqis t8;-:hen 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 t j9cag61-. axo urd 3vmk 2y o/b5rrzoks0;oe+op in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in +/gsj0eo3 k 2mr ov.1orkbcdxzaaru6y5 ;-o9this 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 to8e, 2 lnwq waa45evolu*gej9qd8 w4x, p in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, wue24,gn9va8x ql ,wqje8w*aod4w e 5l hat 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 t bo+ uo 6pxbnk80l8aa0ms27xpop in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the indp+a 8b lo0ks2nmubx0ao7p 6x8uced 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 y 8 2ri,/hukstcarries an ever-increasing current northward. Two coils of wire lie rt /hu2kis8,y flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the nor/gqaubw 46)efj7/p59xsk g mrth pole entering first. As the north pole enters the wire, the induced current will be (as viewed from gubk ef)r76/sp4 jwmxqa g9/5above)

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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 speeo.7+w snqb0xk d about an axis whose direction can be varied. In a region where a uniform magnetic field points str wb0x+n7qk .osaight 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,xq7q sob w,) .a a9,cedoflg8 about an axis whose direction can be varied. In a region where a uniform magnetic field points straight)dgqbq f, lw.o97o ca,x s,a8e 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.kr wrb)m 4l1(v
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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 ttgq6ad0 (y hdz3)7tmf- b4wpwhat 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 lfeqd i 4w9r/e,x 3/67wvgw 2gytlo;vfield. 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 d(, xursg;wm ;qirection) is moved northward at constant velocity through a magnetic field that points straight down. Make a rq; g,wmu( ;xsstatement 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 ve 6b::f7dy/m bb21v 7v6r hhmzdbo zuk2locity $\omega$ 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 transf 9 cx/pjzuc t/ pno6+6nfrc1oil7.0z morms

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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 revol u(: /qil1 kdii)dr6xbutions each second. The frequency of the /qid: ixli)( 6d ruk1b$emf$ 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 usedv vjdp0x5j1mn)u l y,ux9+rce:20qaw 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 devitn x b.ll007bc3zsid)5sm :bzce 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 contains more loo1sywz1zi4x kdol t i922fp h5:ps than the primary coil then ity19 z 4solf ix5d:2h1k2pw itz 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 prif0 :u gdwwfq)a7si4 r7s3zd:nmary coil contains more loops than the secondary coilz 7dqn3u40:w s wra:)sfifd7 g then 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 inie)/5)9qovxs p i8hyl put

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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 circui:g r ;a:9oinaft,

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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 con9tia vl l+)k2bnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acrli) va9+2klb toss 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 seriesdiz;ipbexx ;s0 t- )a4 to an ideal battery of constant terminal voltage. At the moment cob e4 ;si xptz0;x-i)adntact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R hz;6stve:7sz hc6 :qgs;na;wis connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connecl.uk* cg(jf3 3w .dvddury) -hted 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 invygx)p1.9eoa91j1i ge bmw:s series to a battery. The time constant for the circ e1) jv1mwa.: gpxo1egs i9by9uit 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 battery. The bat 1t 7d36dzdrhl wq-:4e:qvi1q*h sgtqtery is suddenly removed from the circuit. The time constant for of thes7qt rwdv q-3q:lh1q1gdzi*e6t dh:4 circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same u-6/pxzrrcp;pur 4 bi,uw2.jb nits 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 ubn)qmhaqk). uwvc9j9 ;z wil+a/q +1power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, th9zu2gmxz oc(gn:9r:c l8-,v kc;y bwce currenzz8o : x(:rc b,mvc9lc-c2;k uy9gwgnt

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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 foap6 p3su7cao0d7 g:g;yn5uractor when the frequency is trica 7;pg3oan:up5 od6rsg70yupled?

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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 i gb: 45ksk- jihwcuge w7evc*dq 3q*r5x4t/ g6nductive reactance of that inductoew/3i4v xkgqs:kje c*w5 r6dqu 4g 5t7gcb*h-r

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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 ;c vjw7zom6gfg 9kn1*AC voltage across an inductor approaches zero, the inductive reactance of that cofgnc v k j;z1g69*mw7oil

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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 c:kv.2bke p/fy: ct6 4pmal7s hurrentb2ay hektlpcp.7 v64/m::sf k

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor wheacqr1 v a 2e1fzlzt+8j j.kr,7n the frequea ,jvt8ra71z jz1kec2f.r lq+ncy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor apprblx7db e9oq60 oaches zero, the capacitive reactax6le0q b7ob9dnce 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 ak)o3l m rlj2q) yay- j1qm. t6)nbg/dof the inductor and capacitor in a RLC series )g 2q)mlaj6t -yrmod1qbk )/ alj y3.ncircuit?

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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 defio0l *s k6;ko-lha /skwned 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 circulu bno++9em c,it increases if R increases. When is this stat +nbemo+,lc9u ement 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 opy*ywnrv4 v. 4tox54vf 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 circ iz.h4/ i caz5 b57bw)moqfn(d bp6ap.3y(fwwuit. 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 double in an LRC series circuvt57exj 0vgx;b6-h9awkju6 ou9oft7it, the rtba5vg h;90xfjt9kj -w6u u 7ov7e6oxesonant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circujy/ naaw3e, .sit that is driven by an 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 cd+/q/bi u7i b /8zdkmqircuit 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 rifn(vw:cc(zy e7 ej 99adius 0.10 m 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 parallel(nwc9c 9f jve:i(7zey.

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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 *pz1 xb2ssln/- c6dbmfield of 0.20 T. Find the magnetic flux through the loo*nbpm2/xs s1 -zbl6 cdp 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 du b(.t 2iia.vmagnetic 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 anglvi2a budit .(.e of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced fromv:y9 5hj4m o)elk8ep y $1.0 \; m^{2}$ 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 from izs pjs1s8) mj+ vx80b$4.0 \times 10^{-5} \; Wb$ 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; l 0 meq((ntzjvyxcek zz2dh15 679gp 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 in 8.0 s, find the average value(mvn2kglqxpth z95z e 0yez;j617c (d 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 a x;j.bt4m23jgw ni)c15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and a/bpy13n ll9, wo1. vesyhsw* nrea $0.20 \; m^{2}$ 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 hok)apv utx:,c4jn:a7):d thxw mwg-n4 rizontally at a location where the downward component of theana4 w4x:)um- vg:dtkwh7p)cn xt: j , 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 long8 a, pmd uk):7fff0 :bn:mw 0j l-laz86efvewt rotates at a constant angular velocity of 2.0 rad/s about a verticaffjtu80e7mp - 80la :6:,edmfk:)afbw vw znll 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 dd y49f4:o1,cbushw;xo bb;o loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of a xgqto;m45f f6rea $0.090 \; m^{2}$ 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 loop is 12 cm l s sa2y:l8mz/song and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long y8salss2/ z:m side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of c*hfj b2cktpc1 dnigw 71* f12100 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 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 cxjupkubk8 )ez , ew+9+onstruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rot+x9e,kzk+eujp u)w8bating 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 generator with a maxiw8mtsxx,)-+z ,b kkup 9: )ch rzy2npkmum $emf$ 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 me0n:kw* jtld4otor have a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC mo /pg(x in:2fsxpva8s 2k/n ez.tor have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at fullxn v2.s8gesa/pin :f x(kp/z 2 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 fu 3 ko:dij0i+to a 24-V power supply. The operating current is 1.0 A. What is the start-up ci+j0 fui3do :kurrent?

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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 resi r( f1wrucqj5 9v2(ibzstance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is (vbzr9qi1 fc5(2jruw 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 kz.c2 ha0p+q c24-V power supply. The operating current is 1.0 A at 0.+pqk2hc zca 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 pr )qevv*8vql.fimary 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 c w0;p b6w+,yz qew q83yduv/paauses 14 A to flow in the secondary. How many turns are in the secob8;+vewwp0d /yzaqu 6q yp3,wndary?

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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 24lm2l))hug4(y6bh t ef-V secondar(h ht2mg )4)6 llyfbeuy has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and j+u(hdd4*1j w/wk dx ha 2000-turn secondary coil+d *d1(dw4/j xujkh hw. If the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. A 53w) wsb283yyjwgwzassuming 100% efficiency, how many amps at 24 V can flow in gw5aw) wyj38b z2yw3 sthe 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 trl 5,ed 181)sw kimsbpc1gu n3ransformer provides 7500 V at 10.0 mA. The primicnkd8ugs31msb 5l1p,)1 w reary 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 coil and 300 turns on its s/2b.nye (txltnbc qxl w9 1-i;econdary coil. If 120 V at 2.0 A is applied to the primar2y(e icb;xn-.t lbw/l9 nt1qxy, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil 7+cp 7tzkl6w usa gc,0and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to thecgcpks 0t6z77 alu +w, primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its sec+xuav6y/3 c uj.s(bgqr1 w+) a,brwzhondary has 200 turns. If the input current 3jur( 1zu/ qxa,w+w + yagbsr)ch6b.vat 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 and its secondarth.1lemy+dsa: .,9so*t q nzuy has 200 turns. If the input voltage to the primary is 100 V, we can expqy. nt* +1s9ulz :.s,aetoh mdect 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 .6ku4bpk c gmgb7 :wknqq p*)5has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we 7qk64b mp:ubqnkpgc. w5*kg)can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at upl6 hq -ui,5mk 8tdq 4.9zfcd120 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 secondary if the prim,6 i.dqk8954 h-pfquluzt cdmary 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 is uon0m k0,qrga633ame8e a /hau iy/,zxsually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Findy0a,q u/m oiax83 enak/063e,arghm z 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 cjzh-ev, (8.tl4xvh pjurrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted thro.lx p tev, jv-h8(hz4jugh 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 lon s/ng+:swrf1m ,/u evww*may, g has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energem ,fa w nw,vwy*1s/m+ r:/sguy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the 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 total resistance of 0.60 W. A generr 4yymm(x,+2 .,j yl gyqnn6txator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is steppedlmny,ytx .62g+mx( r j4yy,qn 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. Hoo+ft+3ilv2ut 4 si4h cw much less power would be lost if the power were transmitted at 3000 V instead of ali4ct vtf+4i 2s3 uoh+t 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 u 6jluyl+z;3e:6 tghl at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission6t:y u3jhz el;+ ullg6 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. Hc tx 9(ej1b-0oc17 e1fgi bsqeow much energy is stored in the coil's mai1 tbq91-0x ejg7b e(fcs1c eognetic 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 resist-g)j pe f:b5wnbs7b h,or and an 18-H inductor. What is this circpbf - b:she,5j)7n bwguit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC cilv0 m9nb)qcn g:b* km j26p6yhrcuit 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 iekv 0oczt8xr8:1 srs-u1g1 :phw-eiento a 120-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-V AC outlet. What is the r5 imyr1 p/zlx/esistance of the lam5rmpyz i//l1 xp?

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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 supplyyrgt5 2ne /yc.ouyp.inc (9i). What is the peak current throu95tciy /nc y.u(oge y.r2pn)i gh 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 120-0q )ukh0m8f wsV ac power supply. What is the power dissipated in the resm80k )0sqhw ufistor?

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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 resistorjr2-s9 pa;3:jlse.*mfnqism 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 resistorn q 6k1sa1h2hc 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 (9, qeaa ev 4gkuo/sov-q3 z*(:g lnld50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH i2pav-n-afi-*u0 kd 4 emocp0vnductor 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+lgz 21; pb6qtgx 4nsbaqkw8* 2.50-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 s job249v)jnu( :ulty have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 10e+nt-:ou rmn 800 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor whe(hf r+8rmhg)bih,ht;e e e;,rn 120 V AC at a frequency of 20 kHz is rghhi h)rmb;e,8 +eft,( ;ehrapplied 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-hzx ;lx/6wj12h9 )plm hnax5y 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 reactance of a 4.7-mF capacs-d8 swkqm5tmfe+ wlehe(.xo k )7 s5(itor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capa7ii-fxl avh -e;d:sm*citive 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 q*nfai5j 7u55ey l v:nreactance 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 reactance of a 0.010-mF capacitor b +e +sub+,xsbse 100 Wxuss+ +sbb,e +?

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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 capacitor at 1000 Hz and 5.0;j6u5jju /sam :oj )gc1ke d8q 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. ,r4 ydpir yuopmy: 0 .8w)tm2n5lx,mg0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactanyr mo:d,0lwm)y px ritpu4ym2,5g8.nce?

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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 coi9tc ak;fdj*h / t7c,kdi. gxs(l, and 1.0-mF capacitor a ij.ddca*9h, /kcg ;st xf(k7tre connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-ac rs,8z+f 46,pgbnbqmH coil, and 1.0-mF capacitor are connected in seriez b6n4prs agfc,,q+8b s?

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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 inducq* /o;,y3 r*h4q8nncdkwjcyqtor, what is the impedan4h,* nw/q;r3y n8cdy ko*qc jqce 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, whgds.z ka:msw40 c 2da7at is the phase angle at 1000 Hzw02s cgd7 4zaks. adm:?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 2)op;f- r vpjqo9om8.k0-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 15p.qoo ;o)p k8j9r-mfv 00 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 resistor an:trw 2h+4hmiw s9gqd /d 15-mH coil to hr s4q:t/wih+ w m29gdget a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH indug2iipo.blxv9q z/6 2ags ,oi4 ctor at 5000 Hz for a totalig/ ,p.s2oo92 4bliavz ixg6q 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 must be put in series with a 100-kW resistor at 1.0-MHz r+lfs7 dnkw(9zichzgo:d 5 /- for a to -w (7: k9z/ zro5dihn+scfgldtal impedance 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 connm.9r ojpqx)r 0ected in series with a 20-mF capacitor. What is the impedance at prr 0qmo. j)x91000 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 1.0 hn9jhk1y2p13v myya4*xypx2 - )lmygkHz for a total mjk1g h3pmy-yn pa1 h2y)v9yy2x 4xl* impedance 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 hiu p2 *,cjh-dat 1.0 kHz for a phase cupd*,2 hj ih-angle 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 resistor at 1.0 kHz for a to q(w9fo6 pkiq5tal 6iwp5kfq 9oq(impedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is thvq0h+ xv 2natcj*r6 ;le phase angl;0h anv6q tv x+cjlr*2e?

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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 b)o*3 1gkyoswresistor, 20-mH coil, and 1.0-mF capacitor are connectedbgwok3*1 s )oy 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 capacitor, ,4o/a:huhos va/fw 7k q)kt9 land a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms curk: h /th4ou l9wav,ak)fo/7qsrent 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 capacitiymyyj ;+s *)qo /zjoj.ve reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What cur *+zo)/sym j;oy jjyq.rent 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 containa wsfyex0 kulk)6z, 5*ing a 50-W resistor, a 10-mF capacito5e sl)wf6*x0 zk,kyaur, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with05rv+sk7mvjmtxz j :4 a 500-W resistor for a phase angle of r:+x5zs4 t vkv07jmmj$40^{\circ}$ 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 = 7d .u+al do;jk200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the +jdu l.dao7k ;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;y7 *gid k*ayc ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circ cy;*ga7dk*yiuit 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 iss:va8j 16d 1ljfet q,s $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit z1p fei6g9tte)/9qudhas an impedance of 60 W and a resistance of 30 W. What is the power ftei/dp1 t99) fegz6uq actor?

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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 r*flf tenkv;df2 g;(5 for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and (5k*ftv2rf ; efgn;dla 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF c9 :s// fjkoasq;bq2 snapacitor and a 15-mH coil in series?s:s/ n2bqk/ 9af;ojqs

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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 capacitor for h(o vs+(/.7 dkilgacca resonant frequencg+lc(( oa. 7cdhv/ksi y of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor f; xlb32j tz2ni:ewrz)or a resonant frequency o:b3lj2 iz; r)ex wnt2zf 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 resistor and a 40-m;k7:h8uor l x(x :e g.r-epqpuH coil if the r :7ploxeq :ue8(h rr. pu;k-xgesonant frequency of the circuit is to be 1000 Hz?

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