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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic fluxmg:1wh4r:+i4dcn dm f 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 inductg obbg.zd.z39a le+( 6q6zd eu,f9nolion 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 kind of cha*f qco5ogz rbwr- w8..yt7a7lzo:p8 unge on the indow87 :a.q o wpgtruzz* c-b5yr7l 8o.fuced $emf$, 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 oftbe-: i-rce*q:tr w/l the magnetic field through a loop of wire produces what kindttci /le:qre- : r-wb* of 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 chac 36vdw7lbv:vge kk 5op058eynge on the inducedo wv65 ckg05:dyk vv e8be37lp $emf$, 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 fiel;i.uvm 9l lddqsw 6g6,ldj+/uk )sf 9xd 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 an induced curre/e cwx8h v 5p)c*c5bnlnt in a conductor will be that which tends to produce which of the fol c)h 5n/ excl5bv*c8pwlowing 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 f;m e yd,ey+v4glat on a horizontal table. A bar magnet is held above its center with its north pole pointing dgdve,yy4+e m ;own. 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 ddzroil ) e w8*nt-1x8its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when vie dx)zr1 ol8-*8ntidw ewed 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 magnetip9i g-afzv/v:p,(dwx 9 w:dk hc field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced currewv9-ih,z f/x g9pd:(da pw:vknt 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 ;ic;ukss qxde v: 0a9)magnetic field vector points straight up. The magnetic fiels vuakd)is9 ;c: e0q;xd suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table to/s umwre;,n (lp 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 induced current in this coil as th(rm,nl / sweu;e 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 t7a p- ,uut(ph)u/ f rr2c5chccarries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewedrr-cu 5h/ u)upt (7,h2cfaptc 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 north pole entering firu-0);*oiyvshkj bbp2 st. As the north pole enters the wire, the induced current will be (as viewed from abovehs*0i)byjkp;ov-b u2 )

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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 g.2w 6ucwu3kz 1:irir angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points str3kg:iuri rzwc. u26 w1aight 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 const zv32v ewp/x yqon9o49ant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the i4/ wxqv3pz9v9one oy 2nduced $emf$ 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.kbv2d5 u s4*go
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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 thasxy4r52 d p4kst 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 *mi94a 0ade6 /y(tn oh dku(zbfield. 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-weste- nw)+piop8g ic ,fz1 direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced -zoig)cwn,p fi1 p+8e 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 constanw4+zsvpjvvq xag :xcabw 4 ./rt+q5 65t 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 transfomn p 4,n7p)yr/0eigd urms

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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 u(au(tqp8p7 s revolutions each second. The frequency of theq a ut8u(7p(sp $emf$ 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 deyft.f(cavl/ kp10t 3 vvice 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 devic+ y.iprg-8ts se 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 thaxvh0 +q+em9t8mvc3r in the primary coil then ri9e0+x v +mmt8cv3hqit 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 contai7x 68vi3i(mo)lzybtons more loops than the secondary coil thxiblz 67( vi)o3 8tmyoen 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 i3 hd4wh rj*wyz2h7xz4u *g4 npnput

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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 resonanx nndn*z9juh8/ rs8i. t 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 inductl(9frd.lt n*dor are connected in series to an ideal battery of constant .9tlrld df(* nterminal voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ) tz t, n/0.k+vca,br 4gzmfcsideal battery of constant terminal voltage. At the moment contact nt,s .k cz 0m)bgzvf,tr4a /+cis 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 witryfwch5jn4u+z 9vm,f -8 dbw+h 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 con8g(2g0 km0kpo6b c kcxnected 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 seri6hqm7 ayb-dhdti4+ 3q es to a battery. The time constant for the cd qt6b4yq7+h-hi3 d maircuit 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 connected5: a*ykp6 1phveda)nj in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time require1e5vy j kaphd) 6apn:*d 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 l ok19rbh12 r,w p(bgaunits except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the cbzq wm9,h8 fz3urrent

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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 cnb x xb8* swfm8*p;ue5onnected to an AC power supply. In this circuit, the current8xwxp ms *85u bnbfe*;

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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 6d jox30 ox(lrj.eq1yac circuit changes by what factor when the frequency is .1l3jeyo0q6x(d jr x otripled?

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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 inductivlz-u0)x-dw efe reactance of that induct0xw ld )e--fuzor

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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 voltage8*gemt 4zrh8f across an inductor approaches zero, the induct*re h4g88t fmzive reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an A6p2uuom*9 h2u hkrd;x C power supply. In this circuit, the currentk9humod u62;u *hxpr2

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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 cirqq3 ijl5i2(xoiq ,8u2dryq n 7cuit changes by what factor when the freque( lrxy,2 i8ioqq 3iqq undj752ncy 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 approaches zeroldh rii1lpafvz6d2b s:c;. 4 wh o;l30, the capacitive reactance csh0 b:owii zv.;l3drh6fa;d 4l1 pl2of 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 inductor an07i* k5a *vkttfntvk* d capacitor in a RLC series circuitv50ak it7**vtftn k k*?

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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 4(e2 okvf s2ywc xtdldq*n9,2is 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 increa/tv(-* lhkdfa ses if R increases. When is this*va-k(ld t/ hf 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 igp5wbh g l; 4lu.,t/5a ced0ffmpedance 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. Thf6cxv*r1 dbi* e 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 beyfui8b51 :k ,vf7th double in an LRC series circuit, the resonant frequency of that circuit e,iv75hbb1ffuty:8 k 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 applied voltage. At resonaf,2 .f(b o0f h 9frote3mbonm2nce,

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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 circuitj61g+q0( 7rxyl bam zi 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 rotatiran+(gl 1+gvczkyn9t6,ge/ ul wu9p1ng in a uniform magnetic field of 0.20 T. 6ulgz ++/ un ,ncra19vg1kt(gw yp9el 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 rotat7(en 7 i bpgug2m4,suwf9*t luing in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and(mib wnu7* pe f,279 luugs4gt 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 magneed5elpn* h7)b(u1rq s tic field of 0.20 T. Find thndu 7*q es)br(5p 1lehe magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area on1boi cv0+bu )f 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 change5q 1ahv qw2bv9.ip5 a;qkm 8pws 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 sidsfyn2a :l1pm;xq6 * jbes 18 cm. A uniform magnetic field is applied perpend p:sn 6*mxf2q;yjb1alicular 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 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 cqw /p) :vos*2btt+ybv 1(ay 7fjxs0t 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 +rv 2(lzgvx6v( .yhbjarea $0.20 \; m^{2}$ 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 +fbbr.g v1m7lu3 h h/nof 60 m flies horizontally at a location where the downward component of the Earth's magnetic field i /lg7hbbh 1 .fvm+rn3us $6.0 \times 10^{-5} \; T$. 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 acr(hvd4e*d8q7 nm d 0l constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant maqm4h7en * (c d8vlr0ddgnetic 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 areybq z:k7l ao* 3md)i6ua 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 tup);-w xbk0:9 dir yfwbrns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its .k5ska0jk f h3tpmb 1(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 ft.bk1 pk53s jk(am0h 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 100 turns ofxhuz-x.5 eg9gko:c a.zcd2vq1 (:fur 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 aia3lq + fv;,+dnak)(crg ;gnw simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available fqnagv;3w+kl;d,nai gc ) +r(. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maj1 w.fktc frb3 f79te;ximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. T c--0h/ tzb w;-6, keud uuhsr5d3ztnahe 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.n; pfk*bw -q0d00 W. The motor operates on 120 V AC, and when running at full speed it geneq kbn0p*d -fw;rates 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 resi:mimgy3 a1w hn wx2;0;8ucrglstance 6.0 W is connected to a 24-V power supply. The operating current is 1.mg;l1muchg8y;rawi 3 xw :02n0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resist7q zq5tf0xn nnto6-gh1 s,l i+ance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speedqo,t hf-i7l5n+ tqn6 1nsg0 xz. 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 resist, nf;8b7hbgv jance 6.0 W is connected to a 24-V power supply. The operatb,hjgnv;fb 87ing current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed tolx mlk/sd: (+jq wxgp/w;qd 98 reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A tovp k+ xc0haet0qn2.b,i*jc qty-m)a4 flow in the secondmq4n) .havta pkj,2xi+0*q 0ycet b-cary. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are nece q 4 xlihemr 8e (c7m)f7:bj;e2ygdqhrf+ 60xvssary in a 110-V primary if the 24-V secondary has 6b x)7qdf:h+qixrcve;ey428m0l f7ermg(h j100 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 ay(w5lh8+tmkrg 6g fufk,y l. ; 2000-turn secondary coil. If the curren5 .rkggl ym,8; lw+uhff6(tkyt 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 transf1,-5p qb hfwhzormer. Assuming 100% efficiency, hpq 15f,-bzw hhow many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign trans anr9f.l7epjh0wnf+ 1former provides 7500 V at 10.0 mA. The pre alp791 . fr0n+nfjwhimary 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 onfpc x/g886f jd its secondary coil. If 120 V at 2.0 A is appliedx6f 88g fc/jpd to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coheq139/h9j im 9ody joil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what c/9ijy1h9em j oqd93ohurrent 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 has 200 turns. I)d77i.s0l 0aie6sl 4zbsxmauv u: g83ch* xjmf the input current at the primary is 100 A, we can expect thal mdcame s0 08sz7l: bixv*jg.uih4)67 xu 3se 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 secondary hadmu5s*q g 8r;us 200 turns. If the input voltage to sr5gmq* d8uu;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 w9 rh3f2m;kz gits secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of thek 9hfw r3zgm;2 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 voltage 7gme v5w7hr.:dm a*ti ud1sm*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 primary has u77d 1: m 5.i*vsghmdtewa*rm200 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. Thir:utpwngat i7p53ao** 5 *iue 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 percentage power lost in the transmission lineuupn :iwg 5r5**atoa 37*iitp.

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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. Txp)yi1 -y7 yuuhe 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 percentage power lost in the transmission line if the voltage is not stepped uyuyxpi-)7u 1yp.

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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 ok 6s;hw/h;iiof 0.60 W. A generator produces 100 V at 70 A. 6ih/i; wh; sko In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be 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 gene c) k j(h o3axbw-uwpm;(g0h7erator 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 10w m jo7-c)p0ake;h3(gbxu(h w 0:1. 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 blr07v jv/t(h hk+f d(1000 V. How much less power would be lost if the po k/+ 7fjhl(trd (bvvh0wer were transmitted 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. It is to be transmitted4p)l7i k(a gc)bpaarznx(b1o qf )5s /ql)s2t on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if o)li4l1)r atfb nq)5bpsa) x7((apsk 2qgc z /the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in the c;8v tpiv:1 y 1xpbfe5qoil's magnetict 5fv1 :ppx;yqbev18i 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 induct v.n*)v(ef6pmf k g:.v)jdhnpor. What is this circ*dmk.p6fjv gvnn)e h)v( :fp.uit'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 circuit where the rms volbh9;g: *la 7d74zp ub if,ulimtage 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 inte8 z+6yapjcm 4gp: c.ro 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 resisyglg l4vlx8eu --j6sz f 7t9/htance of the lamp?v87l46syt9-lj/ezlgfx h g- u

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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 sur3vxp4 b;r1:lxo-adx8 i(yd zpply. What is the peak current througi;add:ry8rp3oz l-(1 vxx4xbh 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 conneu zswia 30qu4jmhp(:nd98 dc4 cted to a 120-V ac power supply. What is the power dissipated in the resistor?idjsp3n4mqh48w :0u dz(c 9au

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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 re +apbp5gka ,f8sistor 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 resia7 n lfo y 1rk)pe.z9:zh1jg+bstor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is c(d b/w1pp sm9v; eld.$I = 0.80 \sin (240 t)$. 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(gvj9jsh :0j d2i.j cx 1.0-mH inductor 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 inductiv ptuct9) w xn,(i7/c6ybd lt*we reactance of 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 a7mh0ge d wc o1myv6;3c 14.0-mH coil 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 inductico)+ ),tnjbmjve 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 wcjsbele :2d*1 h*o(q a 60-mH inductor when 120 V AC at a frequency of 20 kHz is applied to ithqc1 2j**e:(oblds w e?

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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 Hz so )q+hii-,2g6ncfxzy;75mhss dyd;rx0g a(haurce?

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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 capaci9oa jzgt0(i:ufd qij ,gx 6l*2tor 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 capaamx wvi oa6yqjg84tmr )2f5+6 ldxj 05citive 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 *y;k but.vzbn0k1h z4b 0yre 1a 10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency willake(x.lxw42e-)pxr52 im n oz the capacitive reactance of a 0.010-mF capacitor be 100 W?zr-(ox5xi 24wkmx )e .2lnp ae

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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 0.00 y,*;c4dl3zq(cdl,l6g vyz w r10-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 circuit with 12.0 W resistance, 157;gi geg2uvngxw7)d 9 smo5gmzt6 5m3 .0 W inductive reactance, and 10o9w gim g3mg 7gv u;7 5e6ntdz2sxg)m5.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 1oy:fp gm0c4v(7z 7pww 7lfij 500-W resistor, 20-mH coil, and 1.0-mF capacitor arf77 y p5p:wvi7ocwjf0m(zg l4e 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 10iq5f, v kmc,*h7+xjx uwgac.8 0-W resistor, 20-mH coil, and 1.0-mF capacitor are connected h w7uqcc5i,8m.f*kgvx +j,xain series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, wha u3glqews c+: 4wr1z,.hk) ofkt is the impedance a,e) wou: z1g3q4hrls.k+fwck t 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 withqr n6.gm.u4lesazs /2 a 20-mH inductor, what is the phase angle at aus .e2 nrsm6gq/z.l 41000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF capa y99mjd5e9apkm 9*s2xx wv- hvcitor for a t 99*-dwx9paxv2v 9hmjyk5emsotal impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series lyjqxd00 2gxs 8sjk9/with a 100-W resistor and 1qsd0yg8jk02lxjx/s 95-mH coil 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-mH inductor at 5000 Hz foak5 8jzl(l ;l6vm e-ear a total impeja(ke v 6a58lllz-e ;mdance 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-l ,i8q yto7im with a 100-kW resistor at 1.0-MHz for a total im7i my8o-qt, lipedance 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 connected in series wit/3i6( eq+t bnkuzn0bph a 20-mF capacitor. What is the impedance n+ p0q /3(neb kuibtz6at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capac*d 25f,:/p tor(uyscgb r aa ,qyy8+fgitor at 1.0 kHz for a totay/ga cfr+r sg o:d8p(t,yya 2*u,5fqbl 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 s2fdyxphz ,7.**id(ljzym 1ub* gej b5eries with a 10-mF capacitor at 1.0 kHz for a phase(15 bxgmf d7y* .jbjyhd*ezip, u*2lz 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 fo i/:iq:vh ,ulnr a total impedance of 45 q,niu/: ihlv: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 capaci4)qcbf( frdr8 d4n3ga/q1wns tor at 120 Hz. What is the phase anglrcdsd)14qgf 3(aqrn n b4/wf8e?

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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 resistor0o + ihp/r1pb*yd:w x6c afys4, 20-mH coil, and 1.0-mF capacitor are i/*yo+1a4 f06pdp bh :wxs ycrconnected 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-Wh,/lc x oe+nosncv r(33t4ex/ resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected toe, 4s /no/rce3nx (lhxoc3t+v a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitiveq9dyaa 02f*33z ;ass4 j typga reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 114dptz y;aa*s2 03jy9faga s3q0-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuitm u9(cnh: +6zv 9omkun containing a 50-W resistor, a 10-mF capacitor: 99hv(u cmom 6n+unzk, 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 with a 500-W resjgo5n56.oja)s kcz hqkp; 6e.istor for a phase angle oj 5;56epoz 6haj )kgn.qs kc.of $40^{\circ}$ 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-qnedw2m 3-zg9 mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the dd-z e2qwng 39mriving 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 outpu7/ cph.tv5hyb;vhf2 m ir7uw+t in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W 2hbuph7t;yfcv r .7v/im 5 w+hcapacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit iu vd*.18utnm zs $63^{\circ}$. 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 impedanj6.k7gvcps4p ce of 60 W and a resistance of 30 W. What is thegsc 4 k6.vppj7 power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W resistor, a akhjy1z 5o765zvst lyq t7s;. 10-mF capacitor, and a 0.45-H inductor, when conneca57 1zyytok6s zq 7;ltjv5. hsted to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH2:j8p or) / tq/vxzizm coil in series?:)ip2 rx vtzj8m qzo//

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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 * 85xbfriz: z + gu;dzgn8t/mx30jvwe4.7-mF capacitor for a resonant frequency of 10 k8;ggw j*ei0mx rvtf8: z /z+u5zdnx3bHz?

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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 f4 hq9ae 60wbhq16 vanxv7 x+rvrequencqx66x4 r9eh n70va+qa1 vwbvh y of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 4wg4c5sxji x h/ad:;a40-mH coil if the resonant frequency of the circuit is to w;x/dx44h g: j caia5sbe 1000 Hz?

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