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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 flux ewx(vt1t7 n40dfen14o jc2s*e6bua u7h g- jl rxcept

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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 tb) uyqzrb*:sla5 z3g 1ue/h+ihat 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 oropv (vy-: 6ll :atjk6f wire in a coil produces what kind of change on the itp-ojr6 (vl yk:v la6:nduced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wz w(rtxpm4 ygd /ookbt9q 3,39ire produces what kind of change on odt(op3tgzrb / wx43ym ,9kq9the 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 chrek le)4 e+3laange on the inducedr+ek)ee3 4al l $emf$, 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 ma/eht7xum 9 z )+u* )xsyx7hjyvgnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conductor,xkzr 9n5 9 i-yqkix7bczpu58 will be that which tends to produce which px9u qiyk zr ci87z,5k5- xbn9of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizoxndx5u oiuj.l,( 6* hh lx*grfyf- o7/ntal table. A bar magnet is held above its center with its north pole pointing down. The stationary maf*on.6x h/*l lfidx7(r,j yx u-g 5uhognet 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 horizontalril0bi rdb01.tsh ddb o3 6j(q *sat-* table. A bar magnet is held above its cabbdtqso jr30d(dt-6h sli *b0. i*r1enter 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 poinodobvc2 l)y,vz alm o0l/7,t6 ts lo2l t lo,7zv,do0 6 )ybvcma/straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region u. ( );ly)z;rvvxa.iwwef o 3owhere the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the dirl3a ye (wu;w ;))fx..vio zvroection 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 rmt++d1+i4n 1*fgd d rfc.nrp(zx q* lz8r(dazegion where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the f+rxz(fdzqtz 8 ** rlp(i d.cdr+ 4an11mgdn+induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-y0p9gts; :r*f7ndej6rwc k ; gincreasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above,rtg9c7rnd; s6*0e ;kw :gpyf j 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 poleaz kl77.xpov7 entering first. As th7.lpz aox7 k7ve north pole enters 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 rota)i 6qfuxby;e7m /-cx xvwa-t. ted at 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 7vuxx ;a.m ct -e6yfw/x qi-)bof the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed am (hd 5*3upucdbout an axis whose direction can be varied. In a region where a uniform magnetic field poin* ucm( 5hd3pudts 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.bk:u o t9gh;lpgvr0a4w*; x,b
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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 uy1bk l 125oa*env3cg 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 vt* 7z4tzv02msuuoin4y 2hfia /82ey/ f2yekfield. 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 northward0, gu 7 -vidsg18obbt crc9iv/ at constant velocity through a magnetic field that points straight down. Make a statement cb r7v,cgi0i t9bv/18o- gudcsoncerning 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 mr9lz nlck 7ow7hsz* *8lbc17at 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 transf54;jf;k+o/jf j9 v sf yvexgz7orms

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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 revolutu leiciv -vv )b+12*hqions each second. The frequency of tle i)v1hvcv +b u2-i*qhe $emf$ 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 degaljqg drp5,g/ ei-d1h 74l9yvice 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 da0hu1if;18mpz(nvf; szi t b4evice 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 mor vh+j e0g4mpbz8-kyu1w 6y1tfe loops than the primary coil then it-1vbwuhetk 86ymg p0z1 fyj4+ 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 contaie5f/d)yzl*pm x j;irp,u.f t)ns more loops than the secondary coil then it/p)5 ifyjdtpr f*. ez, ul)mx; 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 inu s)5s7s uyy;fx8w;beput

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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 circuit qfnv9iyr--1;bk4j*k )i gvqg6z0n k e,

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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 )iy *r ib7979u74ii kegrk xuqan ideal battery of constant terminal voltage. At the moment contact is made7i u7r9iqyx)k gi* 47ukire9b 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 fdcl. ij-z(+i;nmavkj5y 7 -nin series to an ideal battery of constant terminal voltag-n5l7fij( kdvzm;-c ya +.ijne. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistancekhj4*eb. fgn l2fon0; (8d 4y.yoapci 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 re.nn-siba ;; gpsistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in seriesjl/-k3 m09ce je c-pkr to a battery. The time constant for the circuit represents the t-ckmj c -pl ee30r/j9kime 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 i :hxk:.9exn,-jtv b yos suddenly removed from the circuit. The time constant for of the circuit reprex y-vnoxe::t bjhk.9,sents 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 h* d2pkmyo(w6;s nura0ave 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 connected to an AC power su32)lvcnb2 m3ljv+5 s mw icm:bck-js 7pply. 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. Invr +o6+ jd rn4q:02cr9 vqjssi this circuit, the curren64vr rvc+q:rj 02oinjs s9q+ dt

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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 what factor when the f62r;z1uk luuysz fr+4 requency is triple sfuuu4 2lyzk6r+1;zr d?

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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 inl9p(li2;eunzi 3g i/ nductive reactance of thnliip(l9ne3z ; u2i/gat inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero,: ajdc6 c0j5gjh50nyg the inductive reactance ofj0h 5cdn60 ca:jg5 gyj 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 connecte8h goz. aiy3i.xdhsg7+0fu3t d to an AC power supply. In this circuit, the current.83 hdioa0hf i.ux+zgg y 7t3s

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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 changebnw,p uezl a2 oxk,kb*u ,y30*5c.pzls by what factor when the frequency is tripley * o2cn3,x0z*uwpp.abk kbu el,l,z 5d?

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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 approaches5kqvj: 9tjh9 woo) tg) zero, the capacitive reactance of that9o hkq9tgjj:o)5vw) t 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 capa,z2i(tto5d ds+ ag l5qcitor in a RLCtdosag+iq, z5d(tl52 series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC cld3-q0wmj fw5dry2m(p+wb2 vircuit is 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 imep xca*n n9-p kac3d z95nip( 6xp2mx;pedance of the circuit increases if R increases. When is this ncmpzp(35k x ax- a6d2n*9pnic px ;9estatement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of thryj:l6v4gg-brg m*d8pl 4 -nx i4ke +je 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 ci;j3 e kywzd,8q5b7 llhrcuit 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 bs xg28prc6teqj 2 k3osa;2z*sa/zss9 oth double in an LRC series circuit, the resonant frequency of thato98*2t/; 2sajasz sq pgk e3r62scxs z 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 resonance,hr,mo2 m*no3n

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a serie*-ycm- ,p tmp3t nqnv1s RLC circuit 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 mag+ /se0jxlc j2onetic field of 0.20 T. Find the magnetic flux through the loop when thejslj0e c+/2x o 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 momzkm mvu;27y4 wa64gm i (ii5(c(bfy is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpenzim 4(oig ub vi((7 6cymya;f54km wm2dicular.

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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 fx42pl lyhpn:rtpc. n4s p;s430 /dpg rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when trnhtxdp 4p4sf .pylg0:p sp; c3n2/l4 he plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjusty gu-zwsen0rc2h.2e.6 , rp joable 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 chxks t3 (13 dkde-2 xrapd)2fphanges 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 sv5ji.b*o,7y, 1 ghskhy (b yn8 xuruo+quare frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly fromyh.,ni7xbku yjvy,o8s5oh +u(* rg1b 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 wic;x ;;/lqdul)4vjgghg:xt d) a2p l,f th 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and areaciyy4) vk)x tuv ./t2b $0.20 \; m^{2}$ 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 sp(6hsoxb aot4,ao1s tt3sm;6dr8kd6 w an of 60 m flies horizontally at a location where the downward component of ther(soo66d ,msdt631tkx awbo 8 htsa 4; 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 rotaf8p--x 3 )woniklo aoxt.wk;)tes at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while inpoko)k- xoat) l.; f3inxww-8 a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional3/cd/ h j*lzxay9j5in area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns , /j;2oaux-en psan- vof 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 jej dmd 9:.oom7h t7yw/5bo2g 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, whio5gdm:d 7ob9yth j7/e j2om. wch 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 of ulsz wr6 x)8mbz8 q)w,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 plm5:k4 dx)zpto construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the ro 4pd5xz: )mpkltating 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 ax;8xnpu-,8+kbow g jgenerator 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 ope p l w7qco,h6o-t jo14shmvg61rates 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 ,6a00pf-wsh1 ec zecs motor operates on 120 V AC, and when running at full zw-c00ps 1 c6 shef,easpeed 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 conrtmna,d +q4 w8nected to a 24-V power supply. The operating current is 1.0 A. Whaarq,+ mw d4n8tt 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 connecte d8r75ir9sp- t9qmdgzv (;uzqd to a 24-V power supply. The operating current is 1; uistzz-rqr 9mdp d597(vq8g.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. 5(k91i d *yuny *gcogyThe operating current is 1.0 A at full speed. What is the back 1dgi *(n95 y ukygyco*$emf$ 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:jmz o av+8-c*4 hg alcbpnu8iy,il +; 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 toh5y fp)-fkc9g flow in the secondary. How many turhf )kp-cg9 fy5ns 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 neceso24myns5 wid3x mj1v :sary in a 110-V primary if the 24-V secondary h wdxvj 4ny25:1ois3mm as 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secondary cot .a7xk;i.62lg aqtvkd m;:apil. If the current in the secondary is tqxa:6i v l.k.2gkatm p;;da73.0 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 transfoz d95msa r- 66gmry 9;iphq8ryrmer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondh5gy968 a 9sd6rymqirpz; r -mary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of2jvx,xfpy*3 0rri)z*zu;ah; j j.yo o a neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 Vu,2r)j*pio axv;z oj fjh x.y0y;3 z*r. 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 transformerz8pkeynn(p539 ch gk, has 60 turns on its primary coil and 300 turns on its secondary coil h,nnzk(8ckye g35pp9. If 120 V at 2.0 A is applied 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 s .g 2hjuyf vi/w): soo p)d9d.qgod-/on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is awfd:d-p9sos/o2y. h/dg i)qg. ujo)v pplied 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 transfo)6ypcbj(v9 lxrmer has 100 turns and its secondary has 200 turns. If the input cu6lyp )b 9x(jcvrrent at the primary is 100 A, we can expect the 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 secondr, r3jyvxd9urpe)h4 1 ary has 200 turns. If the e,j1vr d4r9r)3u xpyh input voltage 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 secondary has 2 cxxor));f/ te00 turns. If the power input to the primary is 100 /;oxt) )ecrf xW, 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 current at 120g rk8x.elecq-4 rrm) gf( -y2a V. The voltage is usually stepped up to 4500 V by -y(q m ce)f-8e4xlr.kgrgr 2aa 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 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 voltag d); fkdy t;i.f8x2adz udm.2we 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 y;fd)xudf kd2 mt..d 2i8az;w 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. Toifmufi4 mnw2c9 +.-zbq :-qqhe voltage is usually stepped up to 4500 V by a transformef-wnm qoqq4 . m:ui -2ifzc+b9r 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 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 jm9d hmm vn oz+cd pq7;/.9fn*of 0.60 W. A generator produces 100 V at 70 A. In order to .mqmvdpnh/;* mz9nf97+dcj o 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. v ho:wzeq 277aA generator produces 100 V at 70 A. In order to reduce energy loss due to w a2e: q77zvhoheating 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 an3+1( pzsp:,kvdycv.fme) g i 6-W line at 1000 V. How much less power would be lostn,iske)+ zyvp(: fdpc1.v g3m if the power 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 +xt3hznw;w,lq2z dpg/ y5:/k( dj zsl 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 transmission is not to exceed 0.010% of th h:dgj3qlx2w zp;+,ltz y d/5s(wzn/ke 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 stor )nhzb-cc5n 1e2+aaqo ed in the coil's magneth1+a2noeqb5 -cn)zac ic 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.gucj3 gn0 yd(md )k71-q2zgkl What is this circuit's time constant?y 17mukdd-)g c (zn0g3q 2klgj

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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 x 791o uz/eu1sucms)jr 82jnxan AC circuit 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. vf59ozqo( 8; u4yny,dvk7xzt 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 fmandr*jz9 dz0r.72 zoutlet. What is the resistance of the lampr7*ddf0anzr z2j 9 .mz?

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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 pjyaob;e .9y2 6gl we+xeak current through the rejx+y9e2.byeg6 aol w ;sistor?

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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 is the pod5,n6 x xpqvyy;s6gw 0apq2,y wer dissipated in the qgx0s 65vypp y;q6, dwayn,2 xresistor?

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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 rz7x02vmo -pr jesistor 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 resisk+4s szynfhhm6-6 ;z5ghzj3g tor 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 isv6m4rd9 *4qj vt( aidw $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 60(qo f;yi2df)f9( ;wkulwag l1 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 10*/hcq3n7j d rrk(dy (h00 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reactance, psv wn+uuvp2sp3wwacq*b/l4 z f+*6?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 1000 Hoh: b5xi+3lp rz?

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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 frequency oft)d ,+otixw )l 20 kHz is applied to ix)iwd ),t lto+t?

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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,2)uptx9awc i1-l5tleg n* 9jo 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 capaci+(.y jelgxr e.tor 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 capan 5e/k;nh7jbhle pq;5citive 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 capap,a iucirqw2 47u*rn ,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 l3vn s0 8zkq sl54;:qea ql,aa*qt//vny4tm bcapacitive reactance of a 0.010-mF capacitor be 100 W:lam ,tens vkaqqlsq38yvlqt 5 n;b/44*0/z a ?

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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 1rf67yiyvxy59,b-z )wc yfpy-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 u2 +nkbxa/)ucac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capaciti+2 b)/a xcnuukve 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 impedanns 1djy7p/k(r zm vcap213lc+ce at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capapmc 1rdkznc3v2ja slpy+1/7( citor 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 150 i oooiryae,h* 5,r66giz;ay0 n,6ipo0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capapyi,;ii h,on6r 0*eoi,a66rzogoy 5acitor 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 connected in seriesf gl+ sqs k+;k(5eo;b,qt l5or with a 20-mH inductor, what is the impedance at 1000lf+ etq, k5grk (q5boo+ ;;sls 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 conneciwnq6ks. 77hcps 4)ek fk5jm)ted in series with a 20-mH inductor, what is the phase angle at 1m 77jweknshqfspi)ck64 5). k 000 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 ckq5l-+a6 rjqww1uhb : oil and 1.0-mF capacitor for a total impedance of 100 W at 1500 : kw q 16ajl-+5qrwubhHz?

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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 yp:jk. sr*1wf2kj2yqu ll+ z1with a 100-W resistor and 15-mH coil to geku:yjqk1p z.*2w+s rlfy l2 1jt 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 em/:yzm9t n6h 450-mH inductor at 5000 Hz for a total impedance of 40000 W?z h9 etmyn6:m/

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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 105v 7pkhdphksf2v7-+nf*ir h3 0-kW resistor at 1.0-MHz for a total impedan 752ffhp hsphk3vvi*k-r+ n7 dce 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 i p26:i+0 r,w0 *psj+-wsiiuvu3kl uepohxol( n series with a 20-mF capacitor. What is the impedance at 1j vip p(0l s+2hiw+x0-,eu rp6ookuw:3l is*u000 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 wt-x/ ef3v/s zmith a 10-mF capacitor at 1.0 kHz for a total impedance of 45 /xs fm3t zv-/eW?

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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 capa lbqqy+,gcs ys1tmz7b3 a(:e-citor at 1.0 kHz for a phasey3t,sb1q a ec ms( :7q+gyz-lb 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.x )g4cigb *1sps)93a0uprq gx 0 kHz for a total impedance of 45 Wi*pg )0)14 gcspx x9rsqaug3b?

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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 1d;jpz2 h3t*g8 c2lp lj d.+n.tbuwty /20 Hz. What is the phase angl2d ;j/l t+ l*p zc.tb3w.2duh8 jypntge?

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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 t4 dzz6,i k)mbHz if a 100-W resistor, 20-mH coil, and 1.0-mF capacito6k,z ztb)id4m r 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, nbtse)w 3pgg*3b gf8q86w-i9dan h5h a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms ct8 h 6 sb 8neh wb9ip)5*g-fqdnagw33gurrent 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 c/ s*zq3:pmw gmf kua*+apacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series t* kz:aps +gwu/f3q* mmo a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC cir0zi6. tp ny6facuit containing a 50-W resistor, a 10-mF capacitor, andap0.zf66nt y i 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 nyiya4ie 5x1w +ecessary in series with a 500-W resistor for a phase angle o4iia1e y5y+xwf $40^{\circ}$ 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 = 10.0a ujnpq k;q4.- mF. At what frequency should the circuit be driven qqap.; njk4 -uin 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 asmqv8ezzix*+ 2pyx2,9x : rrin ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is 2pm: xyqvr,9izi zx s+2rex8 *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 ane xnzgrkz6i-c7)zf;- AC circuit 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 resista fljafclyegwt5 (m;gx9; . c07nce of 30 W. What is the powe. cf 75;ct lagf;(0yx9jlemgwr 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 c c9sbm58mj*lpj; rq6e ircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inducq8j9;bsej6rpml c5m* tor, 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 a0+i(0*qz e sv,bv,3f1ng 5 eovrx hdkjnd a 15-mH coil in series?0(xv+15egefdvj hvi,bns 3,0 ro k*qz

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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 hekus3ub)8 9g1cjn( l a 4.7-mF capacitor for a resonant frequ3(leu sn19 ghc ujbk)8ency of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for y ncb8gpwq -0(a resonant frequency of 1000 H- bq8cpnw y0g(z?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a q*h1hxhq 7-oh ;+iy 4mm-hu ts30-W resistor and a 40-mH coil if the resona-mh1+q*7 h omhsh4-i;thuq yx nt frequency of the circuit is to be 1000 Hz?

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