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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 wc0e(l2we- 6 6kfz2j,jtfjfpflux 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 mk54 1nhy;eg86y*q 6zwgfoxd 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 q/ 1pzr7s,n kq v i0gnj/x/aitkl67 x8in a coil produces what kind of change on the induce t7k1qq x8/vnxi,g6/ lk/rz ps7n0 aijd $emf$, 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 fi j wk2d ppwo69e*m1fj-eld through a loop of wire produces what kind of chan1 wd6j* wfm2o9 pkp-ejge 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 klm;e*3l*-lzu a 9opmxind of change on the inducedxp l*aeullmm;3z*o 9- $emf$, 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 magp ,qq454+y6 wg4hi9 r4 nr*xstophp pznetic 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 in3.i1fm/zcpj )ult y6 -s jk9dg a conductor will be that which tends to produce which of the foli9m )36kl dcu1p ys/-j.jtzfglowing 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 bar e1bk klwt47w 7magnet is held above its center with w7k4b7kl we1tits 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 horizond*20lvy8q) pbj z , e4q 5/uxn(vqgsoatal 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 (wx8dsp ,zvo*jn a/elvu4bqq gy250 )(qhen 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 poibsklvg7 ,/p+xqdb8z3 nts straight up. The l,+g qxpk3v b7 dz/8sbmagnetic 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 wher nrv 5su93r.o*xvi p(qe the magnetic field vector points straight up. The magneti.sv3piqxuv9 *rr (5onc field 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 region where the magnetic field 58ia4ks-vqvzla 4i, 97rvjz k points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as th-7ziq j5vl sikvav4a ,r4k 98ze 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 carrierz02-t8iinw w s an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circlestzrw-w8 2ni0i

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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 g9a/mbd;j v.i north pole entering first. As the north pole enters the wire, the induc v bd/9.jam;iged 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 jkt- 3cv(4jj 6 xwvw :ahx6/a9inx*kwis rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field pointsvca v(-awj66:x9kiw*n/ 4jx t j3wxkh straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotatedd;cl+f,zhv ,p at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what muh +;l ,z,pcdfvst 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.3l3-x;xkhtq1y df a+n
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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 thath5-1liqaf3x jr v5g 88lwa3is 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 magng *t3nu1 6a6plmyho-vetic 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 in 9 0 ix4ihb+cx k(vp.odthe east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Mak +pk 0x4bv9(io xdci.he a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular velocityyvv b;w2sdi)/ 0lg9ur97ng ww $\omega$ 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 tqfl b(0fh9ssk) +r)brms

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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 revolutia5q6-34 f zz -hg8inyxehz o(oons each second. The frequency of thef45 a-- z8 3oxieo g6nqhzzy(h $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used-bbfd*7iz ;wp5 uvmaru74 +lz+ash5e 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 devicqssi f72dm y uq+ 9+phob9g2c:e 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 primary hb(vk 5w(-fx b7 p23dl eromb9coil then it is a7kp-wo dm9 hxlbr(3eb (5 vbf2

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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 secf0ojs5 *r6 evwondary coilvw 5jos*e60fr then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power iy2dkvf, nbo/sfsrl u-0(kf 51 nput

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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 resonan-nred5 1yug.a+ oivi l-tta.f*q cj (7t 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 lj8mg4 ( 3ee-5lfihpn series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistor 4fih 58lmlg ej- 3en(pis

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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 seozo l;w 7yv;b9ries to an ideal battery of constant terminal voltage. At the momeoo;wvb yz79;lnt 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 resistance R is co6 fv36pn rlkun + yav2nx5g51pnnected 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 indy(8q qmysc --uf+(xa puctance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in sery; 3ik xpac/b5ies to a battery. The time constant for the circuit represents the time requi/bypi5 c;3xka red 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 battmseas d, au752 k(gvr:ery. The battery is suddenly removed fv2es7ruad , (g:akm5srom 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 unir*t: ;g:q(okq:ij )uxja74 2e srjomq ts except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circd( z)n vkfs;2kuit, 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 pob,tg 5dw +le0rwer supply. In this circuit, the currenw+ eldrtg0,5b 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 circu,k k9ukkp)yt0 it changes by what factor when the frequency i y)9kk0 k,pkuts 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 inducto2hx-y2c(0c kn l:bm e4xgwn-qr is doubled, the inductive renqb-2 c(2 gwc4x-k exh:l nm0yactance of 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 vo6puwpqpf35n -*1 s4 ino*cxxa ltage across an inductor approaches zero, the inductive reactance of that coilp3iqx1cp6fnx ow u-*p a4 ns*5

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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 sup4gyj;iwu z epgi /+/(wply. In this circuit, the currenjge(gw+; y/ p/i w4zuit

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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 cyhop5.n2c7 +d)) tgx ajmyny(2* ak/u 2e vmqqircuit changes by what factor when the frequency is tri 7ajgh( u 2qy)25meyv * )kno.ydpmx/2qa c+ntpled?

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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 thzy(/)mytmw99 7xfd xfab+* ole AC voltage across a capacitor approaches zero, the capacitive reactance of that capacitmtbmx+9 zawf/7 y(d9ly)xo f* or

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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 volt,iqd u+c*jexc 2 s9 oy11itpl8ages of the inductor and capacitor in a RLC1,ci9*eycjiuxo tds8p 2 +lq1 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 circuit is defin-yzug azrsz*-mw:81*: dsgd3-svk ;8j apr tved 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 impg4o8qh8- kk7ruo0d ju/zh /( omb1csoedance of the circuit increases if R increases. When is this stateq0d8h j-hzukmug/178 (4oo k/ cbsro oment 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/vbt+j .;upl4(cydnb impedance 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 inpc2 va o, q-o(qm6vfc8creases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an 0uth- hshfv8bcpk5 1; LRC series circuit, the resonant frequency;sbf0 v5 k1uthh8hc-p of that 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 voltag vjc,k34 db4d-*edzmr.xj rs2e. 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 cir1 dps1 9k c;j/r pvr48am,ggpocuit 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 magnetic field of 0.20rwgyamd* r95 /bl* :rm T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parawr/y9mar* m: *lgdrb 5llel.

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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 rot6 gyl/ek7x,sl2f pt etu;+b4ety(xvmd,8i 6c ating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the ex( tvce /yl;4ku e , fl8pgdyx6bt7,+smt2i 6plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in q r 2+)-yr*mzh bfjla2a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and th*rb+2 m-l zah)2q rjyfe 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 adjustable single loop is reduced from saszm+g+xau on7 q k,2y09g, m$1.0 \; m^{2}$ 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 chang ud0 .the85zoces 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 w+ c4f ubwrm02sith sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average varc2suwmf0 b+4lue 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 tur6ju n3jvy5 *bjqfeh .a 7fwa::ns 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 artmv;sdn*fsxv /66+c, xq7 joqea $0.20 \; m^{2}$ 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/oi/ *lpx;vua of 60 m flies horizontally at a location where the downward component of t/;vo ipu*lx /ahe 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 bpigz 3iq*s:9jrebh35db8pru ,4 g k4 car that 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 dkr3 4pu 5 zp c ej9r:8g*ihbq3,bsi4gin 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,cej ouc2):t:/7a;pafemm )l r cjdm+p.;aar 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 of 100 tu ea)q7tzi*yyyc7of : py9akm94bb m9;rns 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 arma:0gtuy,*ku+fdvjx d ygt s/29ture. 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 gy 9*dg juk,uf+sxy/:2 t0dvt0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 1fhe-3 jc76fv q00 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish v 3 qn fdkkydd 8;xhmp5i+2),oto construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic,2h3q+ 8p 5xkf;yokimdvdnd) field of 0.050 T is 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 generatorkww8*jun*ln .y j42u4 g hqq4d 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 operatbi d*05,la x. pzdz1jres 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 hcgq w5/mfr:.5 f2fjbmave a resistance of 6.00 W. The motor operates on 120mwqgbc .jm5f:52 rff/ V AC, and when running at full speed 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 connectejq n94anila (rd 8)o2pd to a 24-V power supply. The operating current is 1.0 A. What is the start-up currer oq(jdnp8l4i29n a)ant?

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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 connv3 a 8atdmr0b(3q5 bqrwfnqq+;y r) 4pected to a 24-V power supply. The operating current is 1.0 A at full speed. vdw t5ba(+r0fb48r qnr3mq yq)3apq; 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 t3gtr g.6 qkwn7o a 24-V power supply. The oper rg w3t6.n7kgqating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce 7gb2 e6fl n5jkfwfsl*t.zl*x 1 qnu82a 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 fhpn( h36wum, mlow in the secondmh wh 3p,6mun(ary. 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 nebdm0efc g0 *8mpi.:7hfnqu m(cessary in a 110-V primary if the 24-V secondary has * h7ugm8em:0( fip0ncbm dqf.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 tv:u;e m43a;0az k t1/w1ooint)cyydsecondary coil. If the current in the secondary is 3.0 A, what is the current in the primary?e1d) ymicw3 nyta0t ;4u/zk;:v1otao

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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. egz0 5t6fl)hyAssuming 100% efficiency, how mante0zyg)5 lfh6 y 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 signm),gvij.k+1 : jhsvd1 /zbyoz transformer provides 7500 V at 10.0 mA. The primary coil operates onv:zz gid+jy,/k1h osmjb) 1v. 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turn vz,crn(a;2e2iz,:towa zb2 v 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 voltage is present in t oa,r(n2ab c2zze v,vztw2i :;he 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 3n7v4e x) ysp.whrjq2a,o. 61ita+fha00 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is preh+ 1x aaj.ehy2i.)q4,o6s7rapnf twv sent 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 transformerhtlo /xn,2y9 i aj xz:a-xfo*; has 100 turns and its secondary has 200 turns. If the input 2oxtxa, hfx9 n* il/ao-y;z :jcurrent 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 tu 3ljn m 6uxtfy-teq 3bm4e98j9d 7vz6mrns and its secondary has 200 turns. If the input voltage to the primary is 100 V, w emnu8z9detfmtq69j lym6 - 4j7x3 bv3e 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 haf (z oq/h;nq2cs 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondar qfnzq(c/o2;h y 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 amk86kp(svy7 g,vhm0 it 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 turns in the secondary if the primary hs pv0i86y7 kmv( k,hgmas 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. Thvf,ksmfqt4i(9 (gv m;e voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1g9(4v(sfktq ,vmm f;i .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 currenfb6du3m8y iz;r z5*alt 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 thy 8b5l;airmd 6z*3u zfe 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 of 0.60 W. )9vfx.n 2d dhmxbu 5f: A generator produces 10 5.h2)nufxxvdf :bdm 90 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 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 resistanwg *e:xi9vlji;vgy 05ce of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmissioegx;iv0lw i*j5y:g9v n 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-W line at 1000 V. How much bron)p 1)w 3+/wgckgs less power would be lostgo1w gw3+r k )cbn/)ps 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 generathzwehl gw;w0 c8 e-)go2kx9:(t-xgh q or is 440 V 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 transmission is not to exceed 0.010% of the original pow x- z;2-h wghhkg)ceoglw(ex:8qw09ter?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in the coiljq/1+qyz yd)z's magneqq/y)+z 1 jzdytic 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 6.7 -m;;fjh) zej/l cpeb0-W resistor and an 18-H inductor. What is this circuit's time constan 7l;bhe)z j;fe jcp/-mt?

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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 w*ob+yczke9 d*z,5e 9hgahx 7 ghere 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. What is the ful+u )k7 uv :y+), ztxl ql jgvc,76r6+ndepcpeak 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 2 6o5 o6,aucpknhi-uzinto a 120-V AC outlet. What is the resistance of the la- 5 i6okch ,6op2auznump?

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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 i ) tz+t v*og/31 zsmbdhjmedl,3; w3na 120-V ac power supply. What is the peak current thrw v)1;3 hbj3,/not e*+mtmlizdgz d3sough 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 connected to a 120-V ac0u o )g0koql:w power supply. What is the power dissipated i o:go0)klwu0qn 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 0o6bx)4f)/ /pj+ial ki izatiresistor 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 resistoy3t 9:- z1rn jcavv7llr 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 se-kos )tqi8mi. 2(gs resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH ic4od3t; .bu-w tqk 3jmnductor 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 reactanc4ei: ze5bh8wgm2 .2hq osa po: 1sqga7e 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 1fg2pjwcvl)egm /4 6ir48qh3 a4.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactanhan*gqk5 g2d6)xu- o vce 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 wvwa /6e j4yq*V AC at a frequency of 20 kHz is applied to iw qw6*jya e/4vt?

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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 a2wxpjit(/ yy +,+fmj h 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 1k-brfj j8h4g6 e :qzh40 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 capacitive reactance at * d9g9l5v edw/u(neex 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 doap3e70rfz )h9idh*fch 7yhj8 es a 10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitioe l:gkdb(.29zk i,dive reactance of a 0.010-mF capacitor be 100 W?dz(: bk o,gd ii.2lke9

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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 capacitor at 1000 Hz and 5.0q(-*oxbvo3 r:3hwt eof )(bct 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 serieorn7i0h. 4x kspr357cnj5ka us circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacinnockr5u7 3j.pa ri05 ksh47x tive 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, 2chwde) /+4dga /lthg 80-mH coil, and 1.0-mF capacitor are connected ihdeh)d/8gc+ / tg4w aln 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(lf dsh5p1r hb)73tdg7h0q w a Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are co t7hrf317bgd5 hsdhqp (aw0l)nnected 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-mH inductor1ea o6as 9: cntfui1(ddt; oeg8c2) ws, what is the impedance at 1000 Hd2t61nagdo:1fc cti wssue;9 e (oa8 )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 s)o:iv k n2+1nszv*xx ueries with a 20-mH inductor, what is the phase )oxz*ixn us 2+knv:1v 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 neexw:g5dtw.q l +ded in a series circuit with a 20-mH coil and 1.0-mF capacitor forlx:gtd+wq.5 w a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is ecphm;yy5mrrwjba/9 r- 7 dwm/do9 (2needed in series with a 100-W resistor and 15-mH coil eom2/rwm-9rr5bdy(9j;dpyc 7 w /hamto 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 5dkor7xd j2(f6e hdcg3w cz+;in series with a 450-mH inductor at 5000 Hz for a total impedance of 4 k57drd ;jof+dg26e hxwzc(c30000 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 foqkdemxru:g3h ya a)/ .c6g+6wr a total impedance ofgea.w6kq6gcr/ ahm)d+ xu y3 : 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 with a 20-mFd2wa 3ud/cth* n4/rf3 fq h*zn2fsaf . capacitor. What is the impedanceh3 f4zctwh n2*// ad .fffdarsu2q3*n 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 newg0jei5 kll:,eded in series with a 10-mF capacitor at 1.0 kHz for a total impelew j 50gkil,:dance 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 uvzeq*/+ yjaueo.4xp4o(2+rklr 3 sl at 1.0 kHz for a phase angle ofr3 lov zjl4a 4k+/x.+eourye(2 *pu sq $40^{\circ}$?

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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-xx0ze6yh1 p;+x kf6 z6t+ fgauW resistor at 1.0 kHz for a total impedanc0 z e+txuk1y6g 6hx6fxaz+p;fe 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 with a 100-mF capacitor at 120 Hz. Wha)erj/sh 7 w:cmu/vvtixui.tw6;2 et +t is the phase angle?s / tuwt:v.jix wh27tiem c r6ue;/v+)

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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 resis+f n r/tpyfbu 8d/,,iptor, 20-mH coil, and 1.0-mF capacitor are connected /8nfr/b,di y+ fptup,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 1r)0o+ h2j 9svcz+b) zbnde xpresistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. Whbz)s+ onb90 1xehjv2zd r+ )cpat 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 30 W, and an (ac4ze 5 l e8xy(x1x2 )jjqftsinductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows(x)(eaxqe x4j cfsl52 jty1z8 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 r7cacm w tqf +*-yuddc)q; ,yy72akph7- scnt1esistor, a 10-mF capacitor, and a 0.45-H inducto7yfsc,*q1 udtmcnycqtka +cy7d2w;-h ap -) 7r, 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 seri.4zk x gcqg3)tes with a 500-W resistor for a phase angle of gx3gkz .t c4)q$40^{\circ}$ 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. zc3qd.q/8 s (thuble35 -noqo At what frequency should the circuit be driven in order to have maximum power transferred from-dhl bq3.nt( 8zcuse /ooq5q3 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 wixy-7 +c qkncv(.w uwc3th 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is cnv (7-qc u w+wc3cx.ykonnected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit is l6.1ilb iiw-:fin g5c$63^{\circ}$. 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 impedancen,mll 2utjhur nrt/ - c77j+t( of 60 W and a resistance of 30 W. What is the power factor?(j/m7rnu,l2t rlcnju h-7tt+

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W resisetjxif5swj bpue. (h; kt( vovs,0. (5tor, a 105iu v((j. t( vpj eh. k5w;bs,fe0tsxo-mF capacitor, 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 jj4 9s)bubl/p15-mH coil in series? pl /j)bsbu9j4

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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 cag3la 6wu 9tzy(pacitor for a resonant frequz3t6lw yuga9( ency 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 induc;l6o/gip f9d: 6lih kitor for a resonant frequencyi9lkfp/ lh;o:i g6 6di of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-me: d /5qe79sbwnp8 iicH coil if the resonant frequency of the circu/eqc peb7ns8iw9 :5id it is to be 1000 Hz?

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