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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 /+r9de 9:vigtc fg k3qmagnetic 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 inductiwxjyx7*h2 mhch z+; s1on 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 loops of wire in a coil produces what g/k4hp 80ral15k 0yz6kjounf kind of change on tky6l 0f 5 ahnk4puo8k/zr10gjhe induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through)cy+ 9an5 kbhf a loop of wire produces what kind of)knh 5c fyab9+ change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on the induwdj;y m z i usq2j7 8..7t4vvxqp.m+gwc..du7m.iqqmsgxj7jp w2zt8 v wyv+ 4 ;ed $emf$, 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 frjfe-o bq8sh h9s,gc-: cdw7)ciz5m9 bom a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of ang-. *w+ab qt9ps. k1elbnwzw+ xgg7)h induced current in a conductor will7 n*b .etw .zhq+wsagp9-x+gwb )gk1 l be that which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horiu b6qhfq5:h u-jnu-(izontal table. A bar magnet is held above its c5n:u6hb-uhq uq j f(-ienter with its 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 horizontal table. A bar magnet is held above itsph k +v9gqt6u :8ijp1le bq-5+ hbsogir+)u;k center with its north pole pointing down, and released. As it approac 8tsquipglhbrp u +- hevib 65k1;k q+g9)j+o:hes 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 u klb-+qyhtd4m-345 +dhabnp magnetic field vector points straight up. The magnetic field vanishes suddenly. Whenkh-t4 hbp- 3yadb5mul n++d4q 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 the magnetic field ggbmo l0l9i0b tl6 )w,vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil aslowgmgl09i) bt06 l,b 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 tomnhns5 fqi24np /r73+sfyg)+wiz j n+p in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, +4 npwiq5nyi+g7h )ss/n2mr fn+3fzj 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 a, f2l+-gss12 kxnd-n6mvc xxand carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the ig2 axxmcl-ndf6v,n 2k -sx+ 1snduced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north poubzb:*7iof/6 ziqj(a1 kzf;ole entering first. As the north pole enters the wire, the induced current will be (as viewedf6;(:o j/zaz1zbi*f 7iboukq 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 bd fxvcv )6p6nzf075a an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientatinv05 f)zv7fbd pc6x6 aon 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 awqha ,(4eu8-mlvke*0s o b vefjou ,yd;b/z3 :ngular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight f;*m,oy:djve0o8 4ze b ewqu(/ s3hb-,akvlu 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.ca q0 (msptn yn+)b)-ovsvxv f; lt8)++i-vo d
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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 an nhgtg,e)ti44bkem288u . d pu$emf$ 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 gm7th 8bk;br4magnetic 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) 5 w2qiyhf6.niu w*,l dis moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acrossfnh dlqww yu i6*.,i25 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 aot tqd- *0c3uukq s,- 0;tsxio constant 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 transg/y on6o5,tuw forms

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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. The fx ;)soy4xru;grequency of thxusx 4;og);ry e $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a devic lwdm* :gvk)*je 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 de*3g s ) 1vra/wvvxr,jovice 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 loops eazu f.e85gv6 than the primary coil th6ev8aeug5z f .en it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secondary coi .2v6jj*k 9xry)i:qt*gvtw u el then it is ttrw96kj)vujv e2g *.*xi:q y 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 inp*50pwdvv3zdcd 4g3 4ta+ dys sut

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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( v7c3 6jqfunq circuit,

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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 cwn2h( /c7tzfronnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistw t7/rz2 chn(for 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 w821rvt k n*amideal battery of constant tewmktvar1* n28 rminal voltage. At the moment contact 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 wit l9 -6, apqm+daz(i;l,f ve,mmck.pjkh inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is conneca /sf3h/zo p tkawwj.:-p(lg1ted 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 series to a battery. 2w wu.xzdyhft8)c g:nv7c n; /The time constant for the c/xwctdg 2 ny fu7w:;nvh8c).zircuit 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. Theo38 tfm)cs)ev battery is suddenly removed from the circuit. The timem8vo)3cef) t s constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units exceptnb:5tx 9bqun: :

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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, theph,h-1c:bt9 j3 q dzfmnxzh/8 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 6x4 apt 1nh,3chp 9uqvAC power supply. In this circuit, the currentp6, apnh3vxcuqt 14h9

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactan aib; (ehj7-hyce in an ac circuit changes by what factor when the frequency is tripj;yh7 i(ahb-e led?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the inducti4aj9i0yfpbpsr7gm x * j7v: 2izq08a dve reactance of thatrpi 7gx8 iv 0 dp4s9*yjm:0zfqab2ja7 inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage acro+ ud)+lrsxcf *9 ex/imx.r1mbss an inductor approaches zero, the inductive *u/r xmlc++1fx reidb)smx.9reactance 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 cugm 1e,ijw(-4lkg4 l unrrent4 wkeiun(,g jlm1 -lg4

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive react s+meh l-x,,f. ma+ cd.bc:wceance in an ac circuit changes by what factor when the frequency is tm -fd x. :bl+e we,sccc,ma+h.ripled?

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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 approacheq14 bx vdk9r(ns zero, the capacitive reactan4( rd9qb1 xkvnce 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 inductor0y2cx upgp ,7r and capacitor in a RLC series circ2ur0p gc ,py7xuit?

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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 i:kkj idlko56 ;15 whbps 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 or3;kim/gi8isvwo ; m/f the circuit increases if R increases. When is this s3si8mk r/v ;iw;/oig mtatement 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 impedan, )t,ghe*u)frljp3 ghce 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 io 9b5ha0x m/r (ug+lkkmpedance 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 zy yhnn x2aab88n6hza (-21ykan LRC series circuit, the resonant frequency of that circuit 8an86a (-y2k za2nyhbhx1nzy 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 bmtjqk 3t 1p /p(dvku+f3g05pdriven 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 circuit 64usrtsj*zo (occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotatingsy1 h;uhj e vrs7-;jk5 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 parsh;vy7 -1;5rshjeuj kallel.

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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 magnetcpb,o8, n4liv60qlju ic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop a,lb p c 4v8i,q0jnou6lnd 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 fieldm, rxl6 6 p*p*6haq5tjh/cnh b of 0.20 T. Find the magnetic flux thro6*n6x6hm*/p bhjl5t hqp r ac,ugh 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 area of an adjustable single loops p wg.n ; atcd6x66z)50afala 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 c,yb4 y(o)r69pe 3u bwodw1q vjhanges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cm+gdqiqgy -:*-gw ef2 t. 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 av gq:-wt+ge-d q *iy2fgerage 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 ofheyd*)-m;xugr (tpk: $0.40 \; m^{2}$ 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 areq;(/ ctu n8r aissjwnc(it.4 )a $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizonta : -q2tfuxbhq+lly at a location where the downward uf:q -2+hxbtq component 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 iablx97q/d0 pv7ab8o angular velocity of 2.0bqldi970ap xa7b 8ov/ 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 croseedfk9 cc/t-(puhj6unb(q:3 u 0iwr . s-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 ofcim/n(fh/ 8 -+saiwwu 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 armaturevj04opu dggb38::voij s4p9n . 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 i is vjngg8p:ovpdb4:u49j o0 3s perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of w 1nila5+h8 wrlire 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 c zxk8r1ohb n(ejk)-* zonstruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating co zhbj1k-x(*k)oe n r8zil 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 maxi*w8fqe : u-fw+1vk gmx+ k5wldmum $emf$ 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 resistant yf18dn(f,uace 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 mo7cls ,19m 98prt:gub-px xpj ptor have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it g8 pmu9 gbpj rp:1p7, txlxs9-cenerates 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 zef5du3 5;l u:s30 vuwlmw8ttresistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up current0wdu 3sm53uu;fzel tl 8:wv 5t?

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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 conne8y p):gt:nthacted to a 24-V power supply. The operating current is 1.0 A at full speed. What i:pn8 )yh tgt:as 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. Tho-0ce hbrgha 5i2vi :1e operating currente -v1obir: h5ia0c 2hg is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to jzj8bct vhb 8t;.nx: lf+* tp;-v-xpm 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 a3.t:c5amzr sfogc.- causes 14 A to flow in the secondary. How many turns are i.sc r t :zg53aamo-cf.n the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necex(az:abzv 09essary in a 110-V primary if the 24-V seczz (b9:axeva0 ondary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000.g 55xp/4ybmlia1hn8ol/x k c-turn secondary coil. If the current in the secondary is 3.0 A, what is the curre.41x5oxy/c 5phgal nib8l /kmnt 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. Assuming 100% effibexy99ntof i9j37 9dsz7ezr g,** hjdciency, how many amps at 2493z rdeh9o7*b yzf*9 nj e7jdxis,t 9g 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)n ezh wf2(xs( V at 10.0 mA. The primary coil operates o x(wfe2nsh)z( n 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 transformer9;ler+k ap5c2kh g w w-a3q,im has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the w-3w5 ;2a+ep,klg ia 9mhrcqk 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 turns on its primary coil and 300 turns on itsw3dj j4ohk+ ,rel (h/r; hawo6 secondary coil. If 120 V at 2.0 A is applied to the primary, what current;ao4/d( lr, r o+6k3hwhehw jj 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 secondary haui8arl1e tj er*35w+ fs 200 turns. If the input current at the primary is 100 A, we can expect the eli 3a+r8 rwjufe15 *toutput current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. Iflndc)a )6xc3d q -b.fr the input voltage cbf)xn-3d a) rd cl.q6to 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 secondac9h ovg k+87q*lyezx :ry has 200 turns. If the power input to the primary is 100 W, we can exp8hcoqk +gxl79zv y: e*ect 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 120 V. The vollx+8lh/sl p 3mtage 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 thex3p+/ ml h8lls 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 is usualk2w+eqzi.3-acdw 80x k yo3joly stepped up to 4500 V by a transformer and transm+qyjac kod ww.io3xk23 e-z08itted 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 stepped)s2jarodi c ;9 up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percen s) icra92;ojdtage 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 kmr22fj duk7hy g7sc*.b long 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 voltaj2k7y2h*.rc d fsgbu7ge 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 resist4wfd+l/ as( whance 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 is lhdfwsw(+al/ 4 ost 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 l o 6fuxla9qrp2 r9me4/ine at 1000 V. How much less power would be lost if the power were transmitted at2m6poa/qrxfl uer 499 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. It is to be transmity.gazfx (9ps+ted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if+zp agsx(f.y 9 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 of6go gmch t9/36zpr/qb 5.0 A. How much energy is stored in the coil's maz gphbm9c/ 3/6qorgt6gnetic 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. What is t tlw qr72p.n4;(gyjunos 97zmhis circuit's time constau 7(jtz.gpswnmnr7 ;y4l q29ont?

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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 the tubp.q9lz*1d 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 ino 5b9;w9iqcvito 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 inj+*0 albpmrv j-;kzsse5/ yb 1to a 120-V AC outlet. What is the resistance of the lampjpe+-j1y br lm *ba0zs;v5 /ks?

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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 thek4orwf l: ot+*7xee5u peak current through the resistoke etf*4 ouw7l +:xr5or?

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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 1 .k*ijsa3ah: ki4hft lc5ul 5.20-V ac power supply. What is the power dissipated in the resis.hsafl53hk*cuii . j 4a:t5kltor?

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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 50lgm)n b- xcn (-fp8m)h dz0pz5-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 5uxz8 6pu+hj e50-W resistor 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- hq432n9 tf*diy f*msuW 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 inductor+ :wlo3-ul e;l6bvd at at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1000q7 gvr 7jzus-yd,;mm h2xq;p1 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive re6)tu6y0 i*nt,az etmk.n ek q3hxr5s4actance?

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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 100) sxe4xlrmlxv8qjr3h jt 37: )0 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 when 120 V AC at a freque;2 :qreuvrw0f//tsw wncy of 20 kHz is applied w sqw :;/frr0 uvtw/e2to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz5lm/6b ybhg2s 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 reactskckxxj*+54p zqbt -q q*.s.fance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactangq;q2xzn *r;6axvqk9 ce 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 ij1 oen zoa79lzzk 24(1mb2r rcapacitor 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 reactance of a 0.010-mF capacit7vzzwt52/x9 3fkprla q,q 0j8re+uflor be 100 W/vp3ewj7 fx uk8f2a, r l 9q5+zlqtzr0?

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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 cap.3mt,tjmksg.8k.w xi acitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 63 trk h4:hd4hz fgy*:z2wi ub12.0 W resistance, 15.0 W inductive reactance, and 10.0 W caph fhtg 6w4*bh4zrzyuk ::3i2 dacitive 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 ie s0; q3sb+sy/a/yvdl)tb a -of a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conns);-d //ob s vby+3lstqay 0aeected 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*8p j ng2a,l81dclb *fsnddb6 if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor ac8as* jdnb6 p,dlbfd2g1l8 *nre 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 inductorx hf : z o est*4njdtz7f/v-lv150z.ec, what is the impedance at 100sfx eo* 4dtzzcz 1nl75jvh.v0-:/eft0 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 thf8aqng.x;v4g zox9;asd ,8pf;xf 0ry e phase angle at 1000 zav08so8x g9d n;ra .;p;f,xxqff4ygHz?

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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 20-mH coil and 1.0-mF c v3vw.cnh86j (+dh*m+mnwybaapacitor for a total impedance of 100 W at 150n. v+83*+ hd6cwyv(b mnawjh m0 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 capacitancjsxot2c g:*95h n ua a ;xol60ql6ncd*es is needed in series with a 100-W resistor and 15-mH coil to get 0 *at*sh6ljodn;5oa xc u2lc: qngx69a 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 inductor at 5000 Hz for a t0g63w0 .djqvqz sqp:total impedance of 4q z .30gqjpvds6: 0twq0000 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 seriej)tspcui*8:k(j ,u( lm g*lo os with a 100-kW resistor at 1.0-MHz for a total impedance of 150 so8 (:, mu oj llcg(*ikuj*)ptkW?

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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 imped0a1 u4xkb h2saance at 10k 1ahx2 sab04u00 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 au 72pm.jnlz 3*ns/j- x6m pptxz4u:dqt 1.0 kHz for a total impeda:x2p3qm j l4 .mpn-txpj7s 6/unu*dz znce 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-m4)uka: qjlgwcp d 9v.)F capacitor at 1.0 kHz for a phase angle of l :ja.pg)v)c94k quwd $40^{\circ}$?

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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 +-fzt-v7abz* u7ixri total impedvi fx*7 z+ui-ab -rz7tance 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 thj *.prc9mjtjli6+p- re phasem*cjp 96jr r- ijp.l+t 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)(g .v u q;lf1yslcnm1.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in ser11 .un;my fq(glc slv)ies?

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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 resi3kh q2 evozfls-d ux/r 8x,;o;stor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 1;o3v d x2r;xz,fok -lsuh /q8e20-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, anq)nsu i7.x6k nd an inductor of inductive reactance 30 W are connected in series ton6sni). kx7q u 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 sa p ;kdx:hg1 ;mpq 0.df4,znfferies RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 6pmfpqf4g.:;hx1n0 ;,d fzdk a 0-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W rt uk 1)z ww:ql4-twqs/esistor for a phase angle of1 4kwztut-/wwlq) qs: $40^{\circ}$ 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 x* so:n0 (9zb.b dtjmx= 10.0 mF. At what frequency should the circuit0x zxm:bbo (*9dsn.jt be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit withl g6pu 6ssq9/ o(vahz4 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit iaszv6os gpl(/ 496quhs 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 cij -x*4(kaso6h9d t c u2+csjc7rptt-i rcuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and +a jfy svuf06y2/7kp ya resistance of 30 W. What is the power factory yvu j72p06ya/fsf k+?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit contai/4*vyt i 5a/c+ jdhvsfning a 50-W resistor, a 10-mF capacitor,iftv/y4/dca5*vsh j+ and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capa.pl bc.x3w ,nkcitor and a 15-mH coil in series?w3.,.xkn pc bl

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is need lueht,4zyx 3ek3xg - a4du-(yed in series with a 4.7-mF capacitor for a resonant frequency ofx3 yg4eu - d3tul -k4(yza,exh 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 for a resonant ehf *ua c**h iov+p)bno9. ml.frequency of 100 al*nb )f.o .pv+mu*i9ce *ohh0 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 s r 5 ;hsw/c55idwwczg.eries with a 30-W resistor and a 40-mH coil if the resoc .5iwr d/h5c5 swg;zwnant frequency of the circuit is to be 1000 Hz?

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