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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: 游客未登录  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*gj f0ikxz *;y are units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states t4sr (2(pgaz lnhat 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 kindamf-3pr,g1 -adp +o9h*z qdvt of change on t*fz9d qa grhpt,3 mvd1-a-o p+he 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 mau+uu; fdu2.o agnetic field through a loop of wire produces what kindu f2odu+;ua. u 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 changej7 ;wvjjk2 ln1 on the induceknwlj;72 j 1jvd $emf$, 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 he,h ,9lsjt 8 0e3wwzlfield 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 iqgcv.t/ 58rj gnduced current in a conductor will be that which tends to produce which of the fvqcg /. trgj85ollowing 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 fw h p;hoo(pb(3lat on a horizontal table. A bar magnet is held above its 3b(hwpp (o;hocenter 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 hu: ;d7vxx;rjvz: .f lg r8o/storizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (whe r7x/;jd8.uz:tl s:xro vg fv;n 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 sg*wgnzw - vbq ozv.. snea-(lxo753,the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the se(75sgo-. ez-gvs*xbnon, .wz wv alq3nse 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 magnetzrg9f c6e-yw;pa( f1u ic field vector points straight up. The magnetic field suddenly grows stronger. When v (9u6 r1cef;ywp-a zfgiewed 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 top in a/p6 xdx:b4gwag.c()i v+hyjd 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 thi)4yc hdd bxggia6: w.vj(/x+ps 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 horizontasj6* p1p.4sb9fcd; m6me ptcm l table and carries an ever-increasing current northward. Two coils of wire lie flat on the tamb pcjc*es4s6;fpmd19 pt. 6 mble, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with thklbb) ;kiq(,l je7 go1e north pole entering first. As the north pole enters the wirebjo) gkqk ;7lle,1bi (, 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 a+8zcbb s5k2uy6a tl 6xt constant 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 ax6b6lxb+5 ua8 2cyztk sis 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 constanf bmo)lm+r ;wqx ek800t angular speed about an axis whose direction can be varied. In a region where a uniform ma m0 e8 xok;qb+lfw)rm0gnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.f3xzt m6erj30
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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 t5m 6j0uio be+jkb /iv;hat 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 fielu-a+uuq/8ey( 0tw axsd. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved n dpu -(dpu(hul /()s;u q+olsrorthward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential ind(sld/do; ( lr-p phs+u uqu(u)uced 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 l(ps,ub80*hch n4 xya at a 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 transfo*upk/um5 2askd2 ffnv)0 ss) 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 revolutions each second. The fr8yl 60plxp,a wequency of thx8y,l lpp a0w6e $emf$ 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 deyj .(d5jg hhn5 r wnq2x4dd8y9vice 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 device tlck7wbi m-13rph +rk.hat

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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 mop,a g:*iqprt ed-u3k5ytgj0 *re loops than the primary coil then tj g53*arg itquey*-d0ppk:,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 second ;.;iuszy xxb/uhh/+ k/o2ybcary coil then it;o/ 2+bchi/b; /yu zyuxshx. k 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 power4aot. g*cjz da,r5i uqu08c7jmty 5a1 input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant 0uxawvful2gx . b8b0(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 inducto-vh i(il+rgbx8n5ilm , s ww6-1z e;lbr are connected in series to an ideal battery of constant terminal voltage. At the moment contact is madelw (il -b,re8m5sb-1+h vixnwig; l 6z 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 yd:lmo stxs trj0zh1j28n/bf9 h5*c7ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acrooy tz7cj91nmsb8/hr5 ljsx20hf*:dt ss the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R tp kn)5dftwbk u,3u3763fia pis 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 resistancm4a.vh m6.kdqe 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 conn 8lvtxa*, oqhc6p6:cckn l.l0gy)9 t kected in series to a battery. The time constant foo v9c*t 8q.yh,) alg06:pkc l6knlxtcr the circuit 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 td;b.q) mq u ;msgp-s2mo a battery. The battery is suddenly sm)p2 u; .;sd-mqqgmbremoved from the circuit. The time 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 excek*usnhc9 tk *( fgnc89pt:

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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. ,q/ ecnzcwq 0. 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. *ut8eev0hk )f ,sm+ vp In this circuit, the currentfu)eps* vmkv8 +,he0 t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by wh*8et b ombq4)jpx5y;kat factor when the frequen xq*by84mbt;p j)ke 5ocy 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 is doubled, j*6ekcb6 db +vthe inductive reactance ofd+ 6*6 vkjcbeb that 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 t7ds-5qei 5gn voltage across an inductor approaches zero, the inductive reactance of that coind5sigqet - 57l

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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 t3n)g6u6 /lgyv 0pqxpghis circuit, the currenlvu)gx/6gpy3nq06 pgt

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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 )g,np09adu,7wmkodfan ac circuit changes by what factor when the frequency is trwdpd)0f,u,g7 k a9 monipled?

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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 caub5/ .gcrefd8t3:u pg pacitor approaches zero, the capacitive reacctb :. g3fu58erg/pudtance 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 inductor and cape o*np.unp zblzngt*.;1xc ,7 acitor in a RLC series c7. zxnbu nl*ppt,1ne ;*zgoc.ircuit?

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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 definz 1e s0ephv 57ihtb:0/.ygks qed 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 w6sngi56kd4gdrh d ;-tgri h *0cae: *impedance of the circuit increases if R increases. When is this statement true?g hrn:*d6k rg*40 i6egtah 5siwcd d-;

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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 circuit increases if 3qmtfva; y ,-y$X_L$ 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 y4,jl y5jh6ibu+cf3mimpedance 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 n//fh3kjciiulu3 8;rcapacitance both double in an LRC series circuit, the resonant frequency of thfu3r3 /h;luki c8i/n jat circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At resonanceqb,h1dx2oku( ,

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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 cir3i*h;rr 0su33e ombjwcuit 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 rotating in a uniform m7fqi.u v3o88ptpkux.z u64l gagnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the3p7g6 tfvu.8zop 4kiux8.luq 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 rota 1(r b3:hfr,hcea opt9ting in a uniform magnetic field of 0.20 T. Find the magnetic flux through the lra19,ro( f3: tph cheboop 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 rotating1;z7z 2ia-ln4mcb9zhjahq5 z in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetici7c bqj459z2mhz-hz l ;1 naza 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 singl1(vyr(.g -1 cdgr4zmkgi7 lg he 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 changes9 ipxr5v mrrq:ya+61b 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.vp)2y,y7pqyy+y s:zak4 m ,zj A uniform magnetic field is applied perpendicular to the plane of the coil. If the fie2s+pyy,4aqjp, yzmy)v z7y:k ld 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 turns5lm* .j*o+h(a nocbas*6cpzm 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 araol* g6qsd+tis9 c68rea $0.20 \; m^{2}$ 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 fliee8)k8ps6xs m3pvx3pnk* j8 yh s horizontally at a location where the downward 8mh36kpv3 88*xs je)xpsnypkcomponent 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 an(3y urhhc0 kn2gular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant mr0u c(yh h2nk3agnetic 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 of7c w/e1t b8qn noe)w5:.jmgce $0.25 \; m^{2}$. 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 tu/mvz9h 0tja6urns 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 armat2: a d+/ k8u-ubiw4r(p4uhe+ec wsqwgure. 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 is perpendicular to the axis of rotation, p bi (g e82+dw/q:+crwkuh u4ew 4s-uawhat 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 c ps5w r)tykzf /2b p8.po6r)hjx *4hsturns 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 output of 12 Vik 39 +fh3dhlyyj0i /v maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area +i j3 3dik0 9fhyhyl/vof 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 generato itjpp6f6ef7 f5)0u qpr with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance ofk-:hpb4 1.qlsf,p sm h 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 6.0:z*or zsmyjq ov6n*(,0 W. The motor operates on 120 V AC, and when running at full spzo o jn*(z,ys :m*qv6reed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6di0pjofqc /8 3dv)eq-.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the pc3oqv0e )8 jd/-f qidstart-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. a p+2fmh-itcpty bl(3fj -(s tr6h:8gThe operating current is 1.0 A at full speed tfrs gmcah+ y:f2bj8i-p -h6lpt(3 (t. 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 rwf p3 mqm,2 b.(r, e+z1bguvbeesistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back vu,qbz3.,embp1ew2(g +fm rb $emf$ 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 yt19 em3 mj1nfuw g*+ )tr(cmoneeded to 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 transformeroq*5fp- i ar,a causes 14 A to flow in the secondary. How many turns are in th5o,a*p- ar ifqe secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary ih1dwf7-ll) fc f the 24-V secondary has 100 turnfl)whcl-1d 7f s?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists ofnafnr4;h (l o, a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in n;fa,nl h(4 orthe 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 1h(u5uzap4oz:pmi1v of a transformer. Assuming 100% efficiency, how man:zz4511vpu (am iho puy 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 transformer proy+a yy 66c0axnvides 7500 V at 10.0 mA. The primary coil operates on 12 yayc x6y0na+60 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 tur-/j -3ci-mt5 p, l) 2qsnl2fucdvhbg pns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is appl-h5g-pqmjbllsp)c, i 3cnt/v -f2 d2uied 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 turnilry0t0cq t6h j3/h+y s on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondhqty+0y/6l rj t03i hcary?

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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 transformexrg c/j9z,f- tr has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output currentrgz, -/jc xf9t 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 itxqiy ayo3z(: dlq o));)bhe v1s secondary has 200 turns. If the input v1vh)b:ia 3el qzxy);oqyd()o oltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secid t8f que9g:)ondary has 200 turns. If the power input to the primary isdtg9eq i8u):f 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current5 s.+,gzkkqid+cor 0cer u/fjum 0x65 at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of tuuk.0rgf+ ec5sdjmqxu6rz +o/5 ck0i,rns 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 is --2u pdaiqv;susually stepped up to 4500 V by a transformer and duq ;vsai-2- ptransmitted 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 i3 y5*vsv mewy aujlo59)p q-h ow/1*khs 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 o9wlh3 qjvoa/5 vhmky*ywe-u)1 p 5*s lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistazhlq9b vl7bi3 )lqc05z jm*4ance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce ehbv0zi7 bz54l*9almqjc l 3) qnergy 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 resistan02scv( ku0hv3nqi *vqce of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy luscv (3*nvihq0v 0kq2 oss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-Wfd6o1* vnz z ( vr0(dxic/tmf9 line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of att/* icmf 9on1dx(zf(06 drvvz 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.(f7o ldjxkhh/6o iea8is qg5w -m4*2y It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output b5lfqmkyg7 /(iosxe*- 8hdiojhaw462 e stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is s )5db81x hxwo0w5moqftored in the coil's magnetic fiewx5 wf8o )bh01qoxdm5ld?

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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. Whalyq tni .hej9wk,ff*w2z ) ,1qt is this circuit's tiq,j ),9.t *n2kiewzfql1fw yh me 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 circ33jyek kp/5 9wo0wt;u z rw)oluit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. Whab1g xkb0b o,a4t 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 theb7z syam; *d-p resistance of the la;- dzbpy7*ams mp?

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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. . uur3gh+i3+ o cz/7xznjnucpscy: v b :g)58yWhat is the peak current througniuc3cgc vbj zx.8:z+hu)/ gp 5 s3:+yry7uonh 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 connected1w xvxg. 9dbe; .x8qse to a 120-V ac power supply. What is the power dissipated in 9ev;xwsg 8eqd b.1x x.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 re 9bi w +0bw ltrj1b1n07ncgg/dsistor 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 resvb::yd l7ba77izpxuy8qb- a9 ;jyuu9 istor 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-t 2bxcabg(tq1u7 +)7x l xq1urW 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 ru -so:e;sc47msu3 uu-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 inductive reac+ 5j:uzwvnyum9ke -tt4fdo z:6(;d rqtance 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 a 14.0-mH coil have 14.0 W y93u:e, lgs 7kabe3uh 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 foc l6/e1s9ams-0u k5mrqr oqc-r 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-md p83h;s *)xqfla .kvpH inductor when 120 V AC at a frequency of 20 kHz is applied t8 lh .3d;fvkppxa q)s*o 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 t. sn1qj-ts qw6aba59 ub ;aln;o 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 10 kHznb* 26qwdr*rw(z lbi +g(,eqog h2c+e?

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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 ofzdp 1g-wjp. kv/t,4p, .jci50 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 capaz4.8iy y( 0p wafyjlu(citor 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 0.01s-y4q. z:pdskk72z oq0-mF capacitor be 100 W? kzz o2s7yk4-d .:spqq

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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 ;eofun)l7 p ;g+n:dlr 0.0010-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, 15.0 W pk(mxk6)-jkh n9n v9ninductive reactance, and 10.0 W capacitn v6 x)(nknp99mkkhj -ive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil,awurdmk0xd1 takcs,--m9bp3 ajw )/ 6 and 1.0-mF capacitor are connected wmm bd1sa0tauw- xka-3/d6p)9 ,jckr in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.jdne4qh93wiy5gm .xf z0:d- ki h3c -v0-mF capacito:j9hv qd w czxi4gdie.3n3mh f k-0-y5r are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is cprju bv,f ;2ffr4 1p4lonnected in series with a 20-mH inductor, what is the impedance at1f4 2ujlpvf4b;prf, r 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 with9; cbj:ijf+ww a 20-mH inductor, what is the phase angle at 1000 :;9jb wciw+jfHz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is neede,buw 6 4a*zarvd in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 H6ra *,awbvz u4z?

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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 1h 2d:nn3jsl tseries with a 100-W resistor and j:l1 n2st3dnh15-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 l/ :3pdwkf4s c;w an;/vnogr9 inductor at 5000 Hz for a total impeda4/kwp gc9ov3 rnwa;/;f:dslnnce of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz f/*2, d2f w-ovjyie9gk(;t:se f wiyvn or a total imp :fo w, y/jdev29ifst(wek*-n 2iyv;gedance 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 witto),2wbky0j wbg1 dp1n 6uk:a h a 20-mF capacitor. What is the impedancw knw1t6gp u ob1,:2)a0kbyj de at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitoxoyq17 lx(i+,wz8iur (qxda8:8dk8-zwyd b d r at 1.0 kHz for a total impedance of 4-x8lak dxiw8dqzzb d: dy+(wr 81uxy8 i7,o(q5 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 sealv xm+w fl;32ries with a 10-mF capacitor at 1.0 kHz for a phase mal+w3vf l2;xangle 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 af)b5 dw2yprnwvmbo.2 2s 43z xt 1.0 kHz for a total impedance z3xfoprb2smw .wdb5v n22) y4of 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 isy y,y/y.m9bw o the phase/9,b oywyyym . 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 5.0 V and 1500 Hz if a 100-W resistor, 20-m 3s+v i;ba0glnH coil, and 1.0-mF capacitor are connlg;vi0 3ba+n sected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor,nps. /zod 7kb+ and a 0.350-H s 7z/odp+nbk.inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance aynb93mwz52 *midzg5 /nnnsp6c 4+cw30 W, and an inductor of inductive reactance 30 W are connected in series to cn+z 4w2binwa/5 c m6g3yn n 9p5zsm*da 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W r1g .b .k nn*iz7-zdu1m 7iojgzesistor, a 10-mF capacitor, aigj don z.u11 bg-7zkm* 7izn.nd 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 nece8d y,jgq twgj4jdvg:1 gn1t 5,ssary in series with a 500-W resistor for a phase angle of 8dwngd5,t1j4 j,q1gy gtj v:g$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF.: q7ddx*ivy* m- x.qyw At what frequency should the circuit be idy*vx xmd:w -7 .q*qydriven 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 outpu )4:suf1 +0 s) 7yy)kmj awctkt(ccfldt in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power stl y f c4)w(+ c:sdmy0f)kjuact1)ks7upply?

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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 i / t fr0n-o6;bjub-durs $63^{\circ}$. 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 30h93o-p kj gq8e W. What is the pow-3pg qhj8ko 9eer 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 )2y ; pm+mceercircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected tm+ye ;)rc m2epo 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 crt-wmg0dq /115-mH coil in series?cqm-drtw/0 g 1

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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 amgr 3a/q g(b3f resonant frequency of 10 kH/r mggbfa3q(3z?

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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 ind7aq rc 7(hn0uguctor for a resonant frequency ofc0q(rnu gh77a 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 -8cit) s+hlfband a 40-mH coil if the resonant frequency of thhb8cl sf-i)t +e circuit is to be 1000 Hz?

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