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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 magnel iia0:-lpoxwpa2ew t:. 7 m4etic 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 stateuvf c5bqt /8v4jm2sf )s 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 i6 )+- s)rbq*g ggwfjt w2gq sxb;wre0-n a coil produces what kind of change on tg bq)r )fgqjt0;2w-s + b6g-eswwgxr*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 magnetic field through a loj.jl2m 7h 1hg lym7hsa+9az;mop of wire produces what kind of change on tg;+hms77laly hm2a jj1zh9. mhe 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 oflo 8jdj:t;*,r+ aylvg change on the induc*;g: v djly8,ljtr+ oaed $emf$, 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 a8i+7b+e6cbnc(yyk0 r fza7jz magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's lawt:lb vutcr4h,8b0- z w, the direction of an induced current in a conductor will be that which tends to produce which of the followingwcv0t4zlutr:b,h 8 b - 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 horizontal table. A/hk )oiq1r7 :xujl fhyt1 7nz4 bar magnet is held above its center with its north pole pointingou)zi1q74ynf: /kx7t1 rhhl j 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 horr/ju 70jtu /jiizontal table. A bar magnet is held above its centejjtrui u0j7/ /r with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vector p 1;pe: sjopqw769s.fjgu od0 ioints straight up. The magnetic field vanishes suddenly. jefp:puoqs ;w0oijgd9s6. 7 1 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 levee 6pe tyr/b.sk58nu6o l table top in a region where the magnetic field vector points straight up. The magnetic field byuk6n.o/es 65 et8rp 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 top in a r:x.r4k3w ew zkegion where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced currentzr x.kw:4k ew3 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 horizxit ;q(t0hz g:ontal table and carries an ever-increasing current northwa;:xt z (h0tiqgrd. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the norz20*osh u0we pq)ll+fp-sq 4dth pole entering first. As the north pole entersdl4f -zsu w0le q2spho)+qp0* the wire, 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 constant angular speed about an axis whoseh +5zqf3fagpokgo7 2lt gk (4) direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's ax q7l(hf4gok+kf) g t2pz53ogais 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 avfpt/h c.c qg9 :9m.eangular 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 lq/ h:at.fe cv .gpcm99oop'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.8e1selkzp: dgn*+ 4r ew3 f*ae i6h6gy
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that aioh7ce/s9q: * + k/vbmim*vlsn $emf$ 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 c2hjww2kdhk; nw;2 p65tj7jza magnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented vv3dp7m1h,o j in the east-west direction) is moved northward at constant veldh 317vvop, mjocity through a magnetic field that points 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 c ujb fa9u 6w8485rtbwq6arax 3onstant 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 tra1y3tr9/ sj olvnsforms

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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 60iu.(7mc:z;-qxr v r ng revolutions each second. The frequency of the v qirz-7. u:gmrx;n c($emf$ 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 uss gp(cjv*/im1 ed 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 de1m;a:aiuvv1gk k dbh 2-04lawvice 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 than the prjb p0+ tnmd 2y6k1ble(imary coil the0pm t +k6nebld2j 1y(bn 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 0)+ q;jklusy.b-n6jtsgb z-gprimary coil contains more loops than the secondary coil then it is jgsy-gl nb; t +ukbz-j)q.6 0sa

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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 powe p-k,gha: 9-to:xmu y3olco8 ir 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 resonank/r zi6rqvj e z 7n26p0-mh+ib(mike.l/2qjnt circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ide5*s quf0w lfx5 fbz,es) fh26hal battery of constant terminal voltage. At the moment cu5qlbh*5ssfwf2e)f, z0 6hx f ontact 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 ideal bat8k zepqqkb8aa43g0 m7 tery of constant terminal voltage. At the m4mp k8kba78z 3gq0aqeoment 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 L and resist bo: e*lpjuaepu9h )7;ance 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 inductan7gj *8zdykk7 zce 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 induc/ .n11ph0cwikln2v ll tor are connected in series to a battery. The time constant for the c w 1cvl02k. nl/plihn1ircuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The battery isf rc+7igsm+- . r/ vtdkelm*0q suddenly removed from the circuit. The time constant for of q0drsv7 +kmtl -e*/rg+.f cmithe 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 hqdyr 6o*v3 of l**bqp5 i,n3hrave the same units 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 connec3bx(uageq0 e1 abanz;u37g2vted to an AC power 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 /fug7ozq q(f/ supply. In this circuit, the curren q(of7u //zqfgt

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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 circ1qd25, y) 09 axz dasvfvrqjves658ucuit changes by what factor when the frequency is 6y jv095 qssu) q zfa8vvx, 12rddec5atripled?

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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 doub:pjqu t0nu1v 6led, the inductive reactance of that pqn 01:vuju6tinductor

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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 approaches zeromy1ba ;g0s4 t-1 8jmpf zy2eld, the inductive reactance of that coy;-m 1f 0s24dtaym1gez ljpb8il

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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 con,lfn;6 k puunxjj6wpdeb1 - 0;nected to an AC power supply. In this circuit, the currentle6ux 1;pnwupfjd 60jb-k;,n

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when the freque. a0a3x z jno7p(8ojyvncno. ajx7jzyav 8p(o30y 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 capn9kh/6rj rxq alxh1-4.gzq9kj r1 n8+bpeg n0acitor approaches zero, the capacit1n9xbk g q+ha/z0enh -8k6gl91 xr .rq4pjr njive reactance 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 betweop;v ydl+7k9o en the voltages of the inductor and capacitor in a RLC series circui oopdv kl;y7+9t?

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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 w1(ej 3fd+as)t fmn2fis 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 inc9dd+x agao3 )qreases if R increases. When is this s9ddq oa +a3x)gtatement 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 impedancx(fkt jsae0+8+ muyt 6e of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit y d n)lmcfh*r o6b:27uincreases 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 douej(dx095zcxo om1 (fuble in an LRC series circuit, the resonant frequency of that x e 9zmjxfo(o51c(du0circuit 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 bq tv:-bch,pq69t4oe xy an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circh ru,2ha6y-ox.8g;l4: uyecunz;nse uit 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 rzn1)4 70k n az4(orulwojmp)s otating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field v u)4wzaonjnp7 )zs 10mkr l(4oector 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 rotatinglzk7 v0j 3-lcf qw-,lb in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop an fqc-zbj 7 wll0kl3v-,d 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 unqefkpva01x7 -a tn 48tw3 (8uan g*zhxiform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle -gq azhaewn0kxp31* u78ft (a 8nvx4tof $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced frs00s xg mojo)wg+;m(0kn00 m/ oky lml/bjx4rom $1.0 \; m^{2}$ 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 c :kfsnnux 9;5foil changes 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 )nf40dq p1zc0xyrcyn 5uz* 7t square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly froxnn 5*0yzc 4 7yc) 0drzfp1qtum 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:pdj 4nptga(: h m+2vr with 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 an 4j;oir -+yv*jaihc6ykj5 oaa5(r4nrd area $0.20 \; m^{2}$ 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 horizontallye7h(e3wp wpoz, o1j.d at a location where the downward componentow p 1ho,je7ze.pwd (3 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 tha:w0 jv7k q9k,z dj9lmvt is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic f dkql7zvv:m j,9kw 90jield 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 51g(bqdy+/ ri xe6us 96ujw9av0 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists o;o ev1 q)npu x+m2-yprofm 29ff 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 rectangular loops onnj02ww5oaqr a- pad 7 6b+rjt( 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 T, which is perpendicular to +(ajoaa0 5q wp w76jr-tbr2d nthe 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 o+6nrwxf 7)fr zf 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 V , r7pt5i yhb/cmaximum when rotated at 60 Hz. A magnetic field of 0.050 T ic5 rty,/b phi7s available. 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 ge 8bx 6d w+wl gwohb2zf*6mrqq.g-;9munerator 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 of 6.00 W. The motor operat) 4y .,rvttuqkes 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. The motor operates on-f hor.n(v 7vs 120 V AC, and when running at full spe fh sn7(o-vvr.ed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is /jey/oej) x-k j;7: 3xbjp5kxv1gz mu3yxoo )connected to a 24-V power supply. The operating current is 1.0 A. W;/)z kpe )/:yx7b-xjex3m o 5uvjxyk31ogjjohat 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 resistance 6.0 W is connected to a 248cf vjzizk s8;-v-;ba -V power supply. The operating current is 1.0 A at full speea kz-z s8j;vbv-8f;ic d. 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 is connected to a 24-V gix7 l22; faag8 eb1wppower supply. The operating currentlb x72 g2g8i;1pfwaea 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 n 8 +xra8e mh016kkdqheeeded 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 transformer causes 14 A to flv fh 0fcm5k ,;yb5:buvp3sqn9 ow in the secondar;p kq :b3fvcyf09mv,s buh5 5ny. 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 necessary in a 110-V primary if tyidh:q hl+n29 he 24-V secondary has 100 turns+ 9q:il dhh2yn?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn seihu 0q5bl1hw/ condary coil. If the current in the secondary is 3.0 A, whatqhhb0/ iw l15u 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 100e u3z.z.+a 8jxin:nem 4) josn% efficiency, how many amps at 24 V8zs.:u. jxee4m nojni+ )z3an can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA/0k0ewv0kv(skisi 4+chl z e(. The primary coil operates on 120 V. What 0sc(k0vhz eil /ik0( sew+ 4vkdoes 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 s5*fziqa+y1amy9h 86 id+map turns on its secondary coil. If 120 V at 2.0 A is applied to tm m pz1hqa 96*++a8syfy5 diiahe 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 300d2kj p9k2j- o*v1burz turns on its secondary coil. If 120 V at 2.op j-1bd292zjkvk *ur0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turn xe fp- /fde-r1t)gf)gs. If the input current at the primary is 100 A, we can expect the output current at the seco- ge fg-etx/f )1p)fdrndary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 20d tc c.as8s/xb9h2blvz-ij05 0 turns. If the input voltage th52 d0b is8ztca.xv-sc /j9lbo 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 hklybxn 6h le4f(kvk(/(;; mh its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the sebk4hhxl n( k /k(;;(my6vlehfcondary 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 is usmq ds2h.1 koq.ually stepped up to 4500 V by a transformer and tro2mq. 1 hqk.dsansmitted 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 i7g0i4vezmd dd9-dr.o s usually stepped up to 4500 V by a tdid-v9 4gem. 7r0 zoddransformer and transmitted 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 cu:cib8k8: m(jq 34cw ogymnz*q rrent 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 percentage power lost in the transmission line if the voltage is not steppedkcbci3:4g( * m z8q qym:n8woj 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 resistance of 0.60 W. A ,hz3q) u;1bqtmzjcm/spw/t 3 generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be ju ;hbcmq3pmq) / t3/ szt,1wzlost 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 l7 yq-h.ho9ox7b 8ku rod 0ary;al;e 1aong has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce 1oyr7aeqxbuh0aol; y8 ;kr. 7ohda9-energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is 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 1xomd yz7chy,9n/tc, mbc*,fa 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 1000 n*byxh, z,,fdt7 mmc /c1yoc9V?

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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 Vvaxhq zyc5*0, at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in trz,h5x*cy0q vaansmission 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 curreliggwe h63i ii+0;a2dnt of 5.0 A. How much energy is stored in the coil's magn 2eg3da igi+li;wih06etic 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. Wf7tp;gmli l+ sa/3:t91 crnykhat is this circuit's time /3ntmskai; g+yc:l19t rp 7lf 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 volth0 mh*. tkhf-gage 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. What is the peak 1b)7k1nc +e:brp:zms 6kjhim 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 placafoh,:8s uev 5ed into a 120-V AC outlet. What is the resistance of the lamp?hs u v5:,oaef8

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peak cur 9xx nnc9 t,rhuo(i6w/rent through the resistor?ht6w ,rcx x9(ni/o9un

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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 ii9mt )8*fjq8iq f1rxts the power dissiq1i)fx8 q*t rm8f9j tipated 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 50s,m:3p g:i eqj-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through aoq-- rwn uufn;y(nd9, 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 50-W s+os6 vnyc 6ovx2ifl); hzs.u:mk4j )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 1zl,9gxw/ p:*5zw q4bqrynv .yez zs11*k3av y.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 inductive reactancemkxct w 5*/jy/ 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 c9d;h.ba vgyef;p:9tp oil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactanxm8 kz/2aag k;ce 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 at a freque+)495 tbl du h+essnhyncy of 20 kHz is applis9 l n+)4bs5+uyedthhed 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 ten + d.z8emm gtqg+w;;hrough 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 10 kHqz3,*r /jao9xq:qx6d sb 5ixt z?

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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 5(56opg2b ljry1jc m h+0 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 reactanceeh 28harb d6)b of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be pffr3 .b.*vpj100 W?pb vfpr.f3 *.j

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF caqvq;;z)yc( *xsobf ,s pacitor 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 s j rxud2(8ncphi5*d5aeries circuit with 12.0 W resistance, 15.0 W inductive reacti2ad8c(5h rpj dn *xu5ance, and 10.0 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 19 lx+ld4u(rahu- p l(a500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF d-4a9lpra( hxl uul+(capacitor are 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 ifo6p d1 hdr m/;u:ww+rp a 100-W resistor, 20-mH coil, and 1.0-mF capacitor ar u6/hw+orpd;1w pmd: re connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mHjmo+m83+/ e vxh* *weg4novi+o) gxak inductor, what is the impedance at 1000 Hw / ag ov*g*83jhokxe+xm+eim+4)v no z?

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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, w,cd-s 2p61w *okp*w.o baon eihat is the pw1b6e* kcpo*id so2 nw, po-.ahase angle 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 n+f nk9y+giov5:b/ zcseeded in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impzb+scn/iv5+k 9 foyg:edance 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 reumkvn uw;u:g t7rd5 ,rpi;;8 wsistor and 15-mH coil to get a total impedankp;5;: uuvudtwi8m rg wr ;,7nce 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 :lfep23ek7 gxl 8os5r5000 Hz for a total impedance of 40000esx2:8lg l 3rfep57 ko 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 resist*qz7-; oj/wsr ( jyyndj 8tip1or at 1.0-MHz for a to*pyir78ywjods; 1t jnj zq/-(tal impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in serin lpvra* l7 30)cd da:jh(/+c wlird*xes with a 20-mF capacitor. What is the impeda aw*73j c0)/dli (r+ l*:vr dxcplhadnnce 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 wip8,y3v,gc7fvrecr j2a vc 0+ qth a 10-mF capacitor at 1.0 kHz for a totarv78jq,v+ ,30ccpyrc gfea 2vl impedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for aki1m rkqw(q/2i3 1jr s phase angle ofrj wk2/smii q1kq3r1 ( $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for a to +( wuvo,l(ep)uvs p2ytal2w v()p+us(you ,velp impedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series witn9ix fnru9f 0pe/0p y4h a 100-mF capacitor at 120 Hz. What is the phaseye4 9ffr0/pxun 09pi n 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-mH coil, and 1.ogn- zzb l+4t90-mF ca9zl4o+t -z bgnpacitor are connected 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, aa f8nn/h:)zvsm 9;k1b-o kfhz nd a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit9nf sf-zko) bz hm/knv: h1;a8?

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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 capaci zyqu:: hot9 /-wm.rzjtor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What curre-om:wzzyj. ut/9q h: rnt 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 resistor, bko2:,s.bhx;jk 5 qel a 1 s k.jhqxk:;ebb,2 l5o0-mF capacitor, 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 reslc3hjl3pus,rn* rb-oq 4hc3 . istor for a phase angle of - 3r4c.ocjlrup ,hqs nlhb*33 $40^{\circ}$ 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 = 20.08;a)bpe 7xg eav;zy2l W, L = 200-mH, C = 10.0 mF. At what frequency shoul 7gyaexz; 2b8ap)vle; d the circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit withlb r 9*fp8.+stievig 0 12.0 W resistance, 15.0 W inductive reactance, and pv0tbrf*iel s 89 g+i.10.0 W capacitive 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 ns dj 57f-z2aucircuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. sxt2uw jgzx/ *u6t73is0 ds 0hWhat is the power fa6j0 sdwu2t*zix0sg hstu7 x3/ctor?

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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 ly0gj1 12 bbztseries RLC circuit containing a 50-W resistor, a 10-mF capacitbgl01jtzb1y 2 or, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coi)0e+ s*krlosp 0gg7hc l in series?kp0+l g)rh co0e*7sgs

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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 capacvx3;h j;ug:l- iu v/pqitor for a resonant frequencyuvv:u xilh;3p; /-gqj 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 ser)t+qvxa /;t6yuste/qies with a 3.7-mH inductor for a resonant frequency tua/s tx+q/ev 6)yqt;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-Wkjp.r3t8qsl- resistor and a 40-mH coil if the resonant freque8q sj.r- tkl3pncy of the circuit is to be 1000 Hz?

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