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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 +n 3y up8b,u ax7y0wyk evi8g3.j*hi dunits of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that tht i;41t)er ttoz5i/9qeqt ; tue $emf$ 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 wvn 4. hohl+3ryzg (iw4hat kind of change on the indu4. i l zohr3n(g+4yhwvced $emf$, 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 jas02mcq/fl-p(76 ndbe)q qx of wire produces what kind en-q /c)lpxd qf02ms6a ( 7jbqof 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 wi3)dufa oemlk+7i.c9k re produces what kind of change on the induced d9im 7oecf3u+klk .a) $emf$, 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 magn qv.:ed :l y:czyj:r)getic 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 la0vk :k 8y/r .kb.ey 9p.dlazrfw, the direction of an induced current in a conductor will be that which tends to produce which ..: k9dyfezklrrk0. yb8p/avof 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 horizont kec0c 3 5a7nqjlsla7w s5go;5al table. A bar magnet is held above its center with its nl5q53n cgs77ejs0 akw a;o5lcorth 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 tab1mmr. 7ebvgl.le. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling mv7.1 mg rbe.mlagnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vectd7 hj4i p/1ozjor points strozp47 hj di/1jaight 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 the magnetic fie2.0 2purncg 29eyn omcld vector points straight up. The magnetic field suddenly grows stronger. When vieg2n9nr02y e op.mc2cuwed 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 h(fbvere r -(v ) ip,m4r8hzuz6orizontal table top 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 induce (i6,z)8e(h mufvb4vzep r- rrd 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 horizontad xxjn)dc.t*3racr/ ye a2:w6l table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed2aw*cry xr cd.xjae6/n)t:d3 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 67n p dnao5qh) ;3rfyxthe north pole entering first. As the north pole enters the wirey 5on3pdha rx6fq7n);, 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 constantl5q 0rj cd;an1 angular speed about an axis whose direction can be varied. In a region where a uniform m0lnrqdc j 1a5;agnetic 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 axis5mdrcukt5 a1 pmf8u,e*5yj0g whose direction can be varied. In a region where a uniform magnetic field points straight down, what 8r*,gpu acfe15k0 myd utm 5j5must 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.z4 7q yjyw-ag31f0wu 8p qj;xr
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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 th6a adk6n05u .-v01tr ih )kuzf fv +kosna(ka;at 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 field. Thqde 3x:--a/nczy0rks 4sbq3 he $emf$ 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 u7 ogfzu he)j4e6cd.5in the east-west direction) is moved northward at constant velocity through a magnetic field that poi.5 edcog67 euz)4jufh nts straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular veloci( lc 51g mb)jmcjk+r*sty $\omega$ 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 transfoy*2: alzu9j bmx q93nyrms

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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 frequency of56wxez1 y lje.q xl0x8 thelx1y xj6 l.z xewq805e $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used tt*.r av*ucyh -co0cf +o

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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 devi4hu3 -vw0il7juae btzp1 uz88ce 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 3x2 dxdb41a/xkl-uheb4n v)bcontains more loops than the primary coil then it isa b 2-ebn4uvx xlbx4h /1ddk)3 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 tiu ekuya- li1 +qx9e*(han the secondary coil then ieilikau( x *9qu-y+ e1t 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 e l.6)4or 5y)rx egdgeinput

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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 circuitljri/w2m7+;bb:r fl6 x mg9pk ,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a* -pw ;fzb:u- e ila5r*0hq(zqh4qparn ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across thee lzpq( a rp0*q4ha5-;* hzbufiw:r q- resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of constax2gn x.c0w9mlliej (8nt terminallnl cj2(ie 0.x 8g9xwm 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 with inductance Lb,y)n przw.:s :x;fdk 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 inductaw-78w zjrlrv 2nce 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 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 batoj ecp(dk8e xr76w-*ttery. The time constant for the circuit represents the time required for the current to redj p(8e*cro-7wt xke6 ach

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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 x5s2+ ocofc7e/-lwrwi:g2a j connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents 2+:cxcoojrla- 2g5ewisw/7f 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 w9nl kuynhy+9e-m/ 2ia*h:wqexcept:

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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 pfp6 9t3ayby w)iit-4n ower 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 circu4+e(rldg .wccu i4/. u k0eidrit, the curren4(/i0dd .uigc k euer.l w+c4rt

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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 bv4b1up ympy4.q:i r g,y what factor when the frequen ,yu4v1g 4:.qyippbmr cy is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is88uq ydwjyk 17 1*gew7jzlc-m doubled, the inductive reactance of thac81 j7ljedyym*8wgwqz u -7k1 t inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor apprq ik3 )rd70yz-atiy5vuzl: ( ioaches zero, the inductive reactance of that dki(z537i:0- rql uvay)yz it 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/jy zqkf*0 3eb2j risid) 7-va this circuit, the currentf d/jr7 i3va 0) z*kis2-jbqye

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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 18ojv tmhy6f(q:8qjq what factor when the frequency is triple(vtq1h8q6: yj qmfj8od?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zey 3: ;2,6zo eto o 3dd.yebxihlw4cui8ro, the capacitive reactance of that 4cioe3yd8 6l:,ozt2 e xuydbo3;.ihw 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 betweg3 65bitk.e160*u b wdtdcuwaen the voltages of the inductor and capacitor in a RLC series*.iwub5acgkdu b01td w6e6 3t circuit?

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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)z;olt sw3s1ceqr 5;x defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases ifwlm0 x9eeo0.x; sl*bx R increases. Wlbx ;s90x 0lmew*.xo ehen is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circl:7bj e180qhwrxi0q m fx)6qquit 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 vhgy 3ct0v690cjy--)yalcar(1 j *o h6osnmzincreases 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 ci:xo3tds3v0phlf+ / dxsv8(z lrcuit, the resonant frequency of that cir/ vxfdpshsz+t l8(l3 v0x:od3cuit 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 AC appligc t ra.b ;lpf(ly2w,6ed voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs wh1pbty67 81rp )zipmsjen

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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 isxm 9-ypx7xy25 uzf36bnef5 sn rotating in a uniform magnetic field of 0.20 z n55-e72y9xsuyx nffmbp 36xT. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a unif9s3dg djak,)t0+rkzut)xyave d,5+m orm magnetic field of 0.20 T. Find the magnetic flux throem9)vtxjs d, d,a3y5+ )dakzktr0ug+ ugh 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 fyi)d+ 47yez )2vrorzk ield of 0.20 T. Find the magnetic flux through the loop when the plane of the lz)+r7rydez 2 oik 4v)yoop 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 ar+b*) qdgzxvdsnv0m (:0 dafu) ea 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 chrsc)1nn bqr m-,)i3 m oa:c,huanges 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;mjsh d1o(hz4zb q5 k8 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes u8so 5 ;md hzjhkq4zb(1niformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with gc3rln1g-v t;15 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 eh*y:hucn2o 98rj;kparea $0.20 \; m^{2}$ 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 horid (uz1kva57brlna 2 6mzontally at a location where the downward component of ana1l2(v rzm65kdbu7 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 co(n(b6c4ahx)kcgv me/ll ( t j,nstant angular velocity of 2.0 rad/s about a vertical axis th xjt m(,neghc/a4(clkblv 6)(rough one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional area ofd q2fwi( 9 1wzj 7ejndm7+ql0y $0.25 \; m^{2}$. 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 consist ed78g- adu wp:e1dx bs2a-uo(s of 100 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 rectanhar,0hhbo pyn20 )vw l8x .5ifgular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 Tyir 0f2,bh 0o8xnl a 5.h)wvph, 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 1*v6v i ry- vqnh,ajj/;00 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 construct a simple AC generator with an outpudx6q3+p1 skmrt of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If th1 dpxrmk+qs 36e area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with ao61yvji qte67sagv 19 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 havetx 6f f5 gb5t/kyq7jpkk-w n86 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 motor have a resistance of 6.00 W. Tt 6 eds7pn sz/v9hr4av+qm 59vhe motor operates on 120 V AC, and when running at full speed nma4rzh e69stp9/v+57dvqv sit generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V powervsy nw 2a;b29tla t.r9 supply. The operating current is 1.0 A. What is the star 9twryl2t92b va. s;nat-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 6lh59naiz;l 7 ac*+jf d.0 W is connected to a 24-V power supply. The operating currh l7njzc59l;aa *dfi+ent 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 ic*a3a wgc k fz g)h5rw9x9.n m hwey.mwg90:;ps connected to a 24-V power supply. The operating current is 1.0 A at full speed. W 5gz.h* km0)wr9ng3wx :9fg9whpc awyc. am;ehat 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 pr7idc .txl (wu5imary 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 prigt kd4ti5 /ad , 0tvtv/m,/qqgmary of a transformer causes 14 A to flow in the secondary. How many turns are in t5g 4mtv /tvkqti/d,t0,g/da qhe 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 maj,o. pt/,k.b se ape/z4q 6vgwny turns are necessary in a 110-V primary if the 24-V secondae4. ,e.wkspzp, b6/ oq/a tvgjry 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 pr17ftg3k ii11m:p bqrtdp +e /uimary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what1/7fttk udp+3iqb p eim:1g1r 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. Assuming 100% effiz. d.kkioy-lq ;.jq2v1thb5 hciency, how many amps at 24 V can5k qliv.; ok zd.hqbyt12-j .h flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. The pl*.bw8d x li,pribl*dxpl. 8 i,wmary 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 turc i0i 2qj4zx-owt9 l8rns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to thxiz 2qti8-w0rjo lc49e 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 its s(q, 9uck 2qsppfz y-/vecondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the sekq(, zvcpp9squ y2f- /condary?

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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 sotss460(5 c8jc4 qy 18vxwqcnb wjs3r econdary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondary tov6j jrcw4n1s 345t(q0 s8yqocwscbx 8 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 transformevi3zm2j9c yg(5ck j/ syu4gz :r has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 Vyg3vm s/j9y zuck 4(g2iz5cj: , 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 has 200 turns./ s3c0a.e, wt h*fixxl zg4vxz*0k(no If the power input to the primary is 100 W, we can expect the power output of the secondary t3.xtf x w*lxc0zv g*zoke /i4,a( 0snho 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 vol *i/go,vg8jl r*a 4nfqtage is usually stepped up to 4500 V by a transfori aj,*n/o*8 f gg4qvlrmer and transmitted through a power 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 current at 120 V. The voltage invw /7yb56,9iqbrag/d rdzq ;s usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the trvd9 /5by nz r6;,d7q/igawqrbansmission 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 4at r dy1v7+dhu -q:gkusually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped uv1-d7yta qug: 4+hkd rp.

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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 resistance of 0e+ou m hfj4d+0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, thfm40+ojehd u+e 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 lf p*qxjv)t 5 z+r,p6krong has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original kpjx)p+vf 5 6z,qtrr* energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power would be szv+w.1ce m6m n:mah l .;8esl)r/ga clost if the power were transm 1sm aw:malz+;mr6nv c8.gl./ehesc)itted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. vvj q oz1m:n+ulc)8+f 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 v+)nq+: ov8 c lm1zjufa 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 cuiz(a;q)lx or)tbl .u 5rrent of 5.0 A. How much energy is stored in the coil's magne)(irb) o ul;z txqa5.ltic 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. W;n5x h;jo 2-rj5x whuihat is this circuit's -5h;wnx;5xjh ju o 2ritime 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 circuit where the rms voltr5/-kk h i p6*f4pbewtage 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 intonna/*xg 4 9ccsqfo, 2g 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-Vl bup;v5/exf: AC outlet. What is the resistance of the lamu e 5f;lb/:xpvp?

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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 sup5bg mi jtv+0v,ply. What is the peak current through iv 0g tbm+,v5jthe resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What k.tuo0sha ne5+62 xrsj v)f 2xis the power dissipat65nr2esv+0.ksx f hjtxu)ao2ed in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is ld ,-fvt/l82jkjoyyy gmp+72$I = 0.80 \sin (240 t)$. 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 fj;1;xmzn3 71p oipp:*v;qx6uwljpd 50-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 1y5976gqivb8) qioq 9whqz pe50-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 i ojo*n n.dt,)dnductor 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 3* gl p9vs5n,59wb x0/vvzilesi g8jsof a 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 havk pm/hmsp 0oa7k4,- oee 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 necessayd r3 m7 2;,wkuw; 9sg9yaxufpry for 157 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 inductor when 120 V AC x61s,.-hfi 8siexsc xat a frequency of 20 kHz iscifexs8sxh-6.,xi1 s applied 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 1r;,ep 5wgrp/k xuht;through a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at rlo0a24re7q)mux4 xl 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/q7 agkxbw.a*-r g(rqjs e3 dq(c )pf8 have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance , 2dktxt(-dlhsgx (5uof 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 r zjuu x*ironej9 :k /mg60k26 zyb(c7eeactance of a 0.010-mF capacitor be 100 Wr27ji* (k6okm/ge zu:y xjbnz 9e60uc?

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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 0.0010h yhk(rm*j;+ g-mF 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 ac series cy)sdfw5 +uzmf7avzl k+t 52 ,dircuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive w5su 2d+7fyzl zf,td)kva+5 mreactance?

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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 csp eq6.1l+ mj nol:-idoil, and 1.0-mF capacitor are connected in sjpde.:s61 nm+qilo-l eries?

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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,/ hw10 9s6u6r 8kikvakv(s bok 20-mH coil, and 1.0-mF capacitor are connected in i9/rwkvhuk(ss b 86ok06akv1series?

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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-iotzw ojwq185mz+* b 5mH inductor, what is the impedance at 1+w 5q1 w5 8zzbomoji*t000 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 ide m jzr:2zsg,jus,8zpt(t; twvq:f2,w9z*r s the phase angl,*ztz tzes2 j2r9w ;zd vg(sq u m,,8:pr:jfwte at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a s;a4- wpbe1 itq-f od:+mrken 9-r3qleeries circuit with a 20-mH coil and 1.0-mF capacitor for a total impedanc9p13n qi+rberfe-kq- ;-o 4ta :eldmwe 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.1pwnu,o u9o2kum 2zv resistor and 15-mH coi2p kuzm,. 29vouo uw1nl to get 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-mH2. n-pss)u)vgazp c 3i inductor at 5000 Hz for a total impedance of 400g)csa pu ) pisz-n2.3v00 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 12 yjhki44xxfxasr: 2put in series with a 100-kW resistor at 1.0-MHz for a total impedance of 150: s44 1k2a jxhfxrix2y kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is the imjqs, alhg0g:mzy )e6 3pedance at 1000 jlg6s )ayhg,m3:zeq 0Hz?

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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 withd .b b g/id,xric+3c)o a 10-mF capacitor at 1.0 kHz for a total impedance of 45 Wrbi) cx,co3. i d/bg+d?

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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 cap8yu2ez)y pe0n q /tuk0acitor at 1.0 kHz for a phase angk /y)et0zpq 02nue8 uyle 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 30f)6+/ kyatw7lip ivew5y93oq -W resistor at 1.0 kHz for a total impedance ofye vp iat)o /6yqf3iwwk95l 7+ 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 the phyzp ;.6merll adz/+ w6ase angledam./ l;+re6yzw6lzp?

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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 dl,a esx 4r+w3V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in slwes +r3a x4d,eries?

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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,wc;z+ 75wi;;4ly1jsvrze ylj and a 0.350-H inductor. Thizyr;5ywc4+w v; ;se1ljl7 zj e 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 capacitorv qo+s0gkbl-( of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power s l-0sbk( vg+oqource. 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 5n j 9no,fjmf+8hhjnr..ad/ ; s0-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power sus.f8jfjh .ojn,a h/r9m+nn;dpply?

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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 z 4tu6 axo ldzfm2s-14500-W resistor for a phase angle ofa4zo ml162zux td-s 4f $40^{\circ}$ 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 uzc vhg9l9i3l nm p/:4= 10.0 mF. At what frequency should the circuit be driven in order to have maximum power tranc 39 g 9lpz/mhlui:n4vsferred 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 with 12.0 W resistance, 15; c5knfkatcaur6:4 wo0 591wfiostt. .0 W inductive reactance, and 10.0 W capacitive reactn9o 5 cf:tstck;wrao 1tai.6u4f 50k wance, 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 circuit is1 5xhtbgb x/ 7rfbgw8* $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. hewxd:e -3evn,a) mq5 What is the power factohd3q,w5a n-m veexe:) r?

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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 contcq+47 1,eaid+g1b zc upd0ysyaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz po+gze1qiuydc y7c0s dpa ,+1b4wer 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 dg ;zbx,/si86(7wvw -knx yxs1.0-mF capacitor and a 15-mH coil in series? dx x bxw/k; si,vwz8y(7s6ng-

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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 a resx-metlg0h0v3v1 gd+h onant frequxl h +gv vg0e-m01h3dtency 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 for a resonant frq; gi(m k-u*toequency of 1000 Himtqu-k( o g*;z?

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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 win4 af2rnb 9 i(r7hnbd5i0auh3th a 30-W resistor and a 40-mH coil if the( fub r9rh 43bai7ni5na h0nd2 resonant frequency of the circuit is to be 1000 Hz?

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