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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 flux8ezc+ m)mm7rxtr pp.ns9.z9 r 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 tha5ilhskzxpnrw(v6rh -+ i0q 9n0zi.9yt the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of change bmi*5c;1xtd qon the indu 1d bc*tx;5imqced $emf$, 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 s-2grk5td)p8pv vam4 a loop of wire produces what kind of change onp) -5g mdvvra248pkts 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:1gk b/ bpmbrl.x l2zf,d 7v1w kind of change on the indu zxb 1, b7vrkd1l/glw:m.2bpfced $emf$, 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 removedhq-fzhtz1cx cao9.yk(9 t(s7 from a 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 law, the directibbp 0tert 1i7f( b8h.m hyq8z4k55gqoon of an induced current in a conductor will be thatmeo(k bi1 tzq8 0y t5qh47hr.b5bf8pg which tends to produce which of 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 horizontal table. A bar magnet ,5s:ws n4tz/wni6 rvp is held above its center with its north pole pointing downn,54w s:t6pw/vsnr iz . The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held ab.0)k rzdap9ud jm15au ove its center with its north pole pointing down, and released. As it approaj)r9dkzm5a1u0u ad p. ches 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 mc0foa. oy*zc;j :bh g7agnetic field vector points straight up. The magnetic fijg7c;.c*ofzoybh a : 0eld 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 px/ 5kph .69iq3u oi.eod0pnnwhere the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this 6.xq pn di/0ikpo u3.9ph5no ecoil 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 mk7l9+x1nf9zta: amc wagnetic field poifc+:ax7n zm9at9 w1kl nts straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the 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 tabpvpj8zo:8y- mle and carries an ever-increasing current northward. Two coils of wire lie flat on the table,y8p:v8jzo- p m 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 north pole entering first. An gc7xgl4;h(ee 6 6m:exi(scos the north pole enters the wireg6ich :mgxne4c(o( x 6;ls7e e, 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 abou n+cjo p d ra; ,my3pj1qukp3x+d*+n-tt an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientati*d+o3 njpu+y3 ,amn xp1j+- ktp;c rdqon of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axieqp x3*9xi l2bmtnb6m) 6w f8 :lko8vxs whose direction can be varied. In a region where a uniform6) i3bllx en*8qfx:m9tx6pb kvmwo 8 2 magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.j,ne: yky50lr
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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 an (4xoqnz;i5ib$emf$ 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 magneti p.ej 9dr.ztyt, x:ty8c 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 the east-west dm-ap +v. an(psirection) is moved northward at constant velocity through a magnetic field that points straight d+sn.p(a m pa-vown. 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 constant angul t/quksive0oqdb* ,) ;ar 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 generatoiv t.t)6ww6sg9t de)u r transforms

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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 throughl-v0e8a l1yxd 60 revolutions each second. The frequency of the-al81yv0d e xl $emf$ 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 ewx/kn)sn* b)vy 9t x-to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device that9w* mmuclc+1 jdz ;ph7

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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 containsfg3pb xw, yx3:y1dpe, more loops than the primary coiley:1y xbd,3p3p, gwfx then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops q zw 6wf: +z2v*je.lmsthan the secondary coil tm j .lsz +vq*wef:2z6when 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, ther+:.m+ugh, mvuuf4 fa power input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circuita7 h, xbwv6 :uyu.(kbm*q-xh p,

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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 ideal battery of co/u ;9r+0ao l npxqo4wenstant terminal voltage. At the moment c p 0;wln9qo+o/u arx4eontact 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 arew3xz4ym n0:l o connected in series to an ideal battery of constant termi: lxn40o3yzmwnal voltage. 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 resistance R is connected to anua)g ntj mlo(3u4p+o1p rd )t2 $emf$. 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 i35oupyc1ok x. l)u;r1dr5 +p+ cmbyginductance 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 series to a batter 7ogp9c6zk84 8alyq ny/1zpe4n2mn gwy. The time constant for the circuit represents the time requi94gyn17n/ap6ncz4z8 82mgqykw epo lred 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 in22qyfcqgdqij;2l *g6ductor are connected in series to a battery. The battery is suddenly removed from 6dql;2*igqyfqg j22 c 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 pa0(hk k3mdn7 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 pow 3gps,lfcox 3v2zqw*0ec .uo 1er 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 susxb i53zpuwk7 g-rn08,b kyg (pply. In this circuit, the currenb5k -n8u 3pw, gkbxi zg(7ysr0t

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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 thecouu1;umq84cwe3g m kr k1p1 * frequency is tripled g4r* mue pu1 3mkoq1cc;8uw1k?

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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 ind9)c*hnm( -8s -ps(5 stdpexdohwv:kbuctor is doubled, the inductive reactance of thatod(x -5 b8hc*)vnpkst hsdemw (:-p9s 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 inducto;aq x:kj4rjhuh )p1;3aebr8y x uth66r approaches zero, the inductive react the3 hrb;p1h;8qjky:6rx)j 6uu4x aaance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In,7ry+ b1uri uc8ffkpffe75pro 0l7n0 this circuit, the curref 7bufp,r7 ue+rf8pr l 51k io07n0ycfnt

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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+ vb6 n5vtzf (xq-+grajo 7j+s frequen+jvbxjs6ftn 7g +r+qv(o a z-5cy 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 acr niib 3u6ezhgs tt5+x30q8p g+oss a capacitor approaches zero, the capacitiveg3gpzuibt65+e8+ hqs0ixn3t 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 between the voltages of the inductor and cap8tk,es dt;j5r+ytt-e acitor in a RL+ts;tee y5krt 8,dtj -C 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 definedvne4o43tx6k iat of(:sc1lp4 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 increases if R increase: imy)e vhp*p0s. When is this sta vmiy)* ph:ep0tement 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. T wb4gc 48tq b aequ(*5on4k:qshe 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. Thl,jpra: b:mk yglxr(m 07m.t 4e impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuit,/,/h g tlw4 w.plh jd5/psnm2o the resonant fre, j.4w/st/dm/ l5 pop2lgnhwhquency 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 voltage. At re0a1xhdz x*7 to5mi+5cywjw2usonance,

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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 c;neuge7.h1- c5m(l1z f ymmqb ircuit 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 magn0pq a3 ur,mxov:0o jlc2::mbmetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the lqm:ux 3 m:c ,lab0ojov0r2pm:oop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform mar( hh3.-mru:y8g*v ak ;xymzngnetic field of 0.20 T. Find the magnetic flux through the lha k-u:xz r8ym ;g .m(*r3vyhnoop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m uiohe6; 9,ji 4 ttzadk/(gjx -is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane ofij, -g69x jeo4/zhatd k tui(; 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 adjustable single loop i9 q mh;x-3,blo+eah kede,v.hs 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 cha lh tw-e.)kydhz1k ;tk:*a3 bknges 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 fra.m+r 5*v dnvdvs ;2vxsc. oew3me with sides 18 cm. A uniform magnetic ;oc.e+mvdnsx 3 dv *vv.ws2r5field 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 value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and a zz,j.yn0 pm+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 awi i9n o s14ok43tf4syrea $0.20 \; m^{2}$ 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 fl7juw/n; j-,c ezy.h sxies horizontally at a location where the downward component of the Earth's magnetic field iw7/jh;cu , jzs.xny-es $6.0 \times 10^{-5} \; T$. 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 apb; g.0 i:mxjcwc83k 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 mmw0g3;jc x8k cb:p.iaagnetic 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-sectten: jwj(hwm5o:1(u5b d zx ;j+au,woional 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 tur2/p6 -dhr mi :)uj -nqctn 0kukfpd.gteg12a6ns 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 itv.wlk h:0/a 75c5 i;piuw woaqs 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 the axis of rotation, wha . aikaq o: 7vpic;wl5/05wwuht 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 wxu-*q02usb huar rf0l6p.e(xire 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 conyor6 p-zugcwq9r 38g0struct a simple AC generator with an output of 12 V maximum when rotated at 60 H zu 0rcr8-pg 3go6qyw9z. A magnetic 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 generator with a m3gp -efkke/ rki+ x.yim8*f4k aximum $emf$ 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 opy/ f9 qxs/)nfqerates 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 moto ye5lykb8iay)p yl7m y .a05q3r have a resistance of 6.00 W. The motor operates on 120 V AC, and when running a5l yiael y8y5p.7ayyk0)3q m bt 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 conne)zng. uiyl,xj-y hu19 cted to a 24-V power supply. The operating current is 1.0 Ai)x uul.yz1njyg9,h-. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power stf/3jy v5yl0tupply. The operating current is 1.0 A at full speed. 3jty5l0t /f vy 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 re1imne3 p xvjvdb 158g7sistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. p8ig53n7x 1jmbde v1v 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 a primary voltai1zc2b( a +jqkge 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 ak-f flrvk.ucnf:d)0/. . sxxtransformer causes 14 A to flow in the secondary. How many turns are in the seconnlx /vrufd s)a0-ffc .xk.:.k dary?

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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 the 2j,ucia )n 7dre;y*xb )4-V secxn e) j,;bi*aydr)7ucondary has 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/+kn*t;abr97q cvrp hpi:+o t a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current t*+9;vihp p/k+ :ra tnc7rqobin 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 tr,m c1g x3py9ulansformer. Assuming 100% efficiency, how many amps at 24 V c ,p1xu3 g9cymlan 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 aqw gs 8izo 72;dlsjj9hq0 q4/z neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primar78h /4zozd2w gq ;jsjs q9ql0iy 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 turn9earuq.pg e 1g-uo:--4vbp p ts on its primary coil and 300 turns on its secondary r :b-ap .ug ugpqpe14t9-o v-ecoil. 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 on its primary coil and 300 turns on its secvqab8( cwf:fk 7zt 3m+j-f0j:x*uyzqondary coil. If 120 V at 2.0 A is applied to the primary, what current is prf z*act 7:mj(zf q8bf-vwqxu : +y03kjesent 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 tuvs + ddd+rr)h+rns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the h d+rr )++dvsdoutput 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 10lpwz.+crtt)/ u *kkvb dm o*ctjf))4 10 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the outpm) *pj)od 4t)cc*zwk t.u+v tb/r 1lkfut 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 secondwbd4 - g5sar6xary has 200 turns. If the power input to the primary is 100 W, we can expec4 rsxd-5g6wa bt 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 120 V. The vol)d1s76xz(j k awj-exvtage 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 tur z )s7w-1jk6dje(xaxvns 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. Thegc l/94inzn e1jyl7s;yha ;z8 voltage is usually stepped up to 4500 V by9;c;l e h 87zl4n/asiy ngyz1j a transformer 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 current at 120 dv.yv * f.9exzV. The voltage is usually stepped up to 4500 V by a transformer and transmitted througfve9 *. yz.vxdh 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 asr fmx)nbn(0 7gafv 15f(vx/p total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of a1v rfp07n)fg(xf(v5 bxmsn /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 si;n)q 1o8jb4r bz:do long has a total resistance of 0.60 W. A 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 origi1z8;db nob)q sojr:4 inal 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. Hmdc qh)3jf h7*wgr g:,ow much less power would be lost if the power were transmitted at 3000 V instead of 7c3 j:)w d,mfgrgqh*hat 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 traq6vlm , yn,f7huq zk/sg 11yo+nsmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the pown+s1 ykfvoul 7/ yqqh, z,6m1ger loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in ,rasviv20atx9w:xj4 2oie / fthe coil's mag fis,r ev tva49:wxj/aio02x2netic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H induct *2 c/37eqrgo+.vl.c pj ylin-t2rxrtor. What is this circ lc. lrrjy+ ig*-x op27qv23/centrt. uit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 120xm:a2/k* 5bf8lt ymnq 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. nec(x. wsz2-7 j aqtok:sf0z 5 What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of q,25i x k20c i4fkb;xgg l4zlythe lampq,; kl0 yibx225c4k4 zgfligx?

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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 th.n . w0( y.agumwvwd,ce peak current through the my(g wnvc wau0,..wd. 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 12oui,-pwqq:n7 ts 3uh i/7b0 t,zmdrt/0-V ac power supply. What is the power dissipated pizq/uo7u,0s md:b/ rhwn t-tq7 i, 3tin 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 resizx 2s,,8l evlxstor 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 re,6 n cmyl;m1:w 7dktxnsistor 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 an0dbgr3u a55-W 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-mH1e pta*m7 z4u*;sf x;biks,yb 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 reactance of a 2.50-mH coiqkuy bw c0+l((l 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(ru y 1xqfxwyc ai/w.+x jz9)5 a 14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 1000 Hzyms u gux/mhs r-sqc447nz3dj1,(: a +njuy* z?

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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 ins.g/aw 2bpta: kxkn (tf56gs/ ductor when 120 V AC at a frequency of 20 kHz is/26g fkp: ab t( ag./kn5twsxs applied 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 thr3(nasx6 r5 gohf wpk11 ws1 v9)c/ekrbough 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 atfk)eatqg 29mprw+6t9 ; uu(xg 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 capacitij5c6 52*oq gkt*l9fw n owpz3qve 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 reactan j0f3c3gr dyp9ce 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 1001oarw ,94k ana W?1a,awk9a4 o rn

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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 ad- .mib v.+z+xg yd/oac(v)r(di t (gond 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 serptxz ,*l6wk ;l iiuc.6ies circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capaci;ulck,.w 6tiz *l 6xpitive 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 .6flc gqr9zkp;w1p 6c6h7qu o100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in s.r7o h;6q6cf6wpqg ck l9u1zperies?

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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 19-- b hi27mdnx;bxofi 500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor aref2ibi; 7hm 9-ndoxb-x 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 conn zq;- n46+ajlp(wpksfected in series with a 20-mH inductor, what is the impedance a6jzk(nqf ;w + -ls4ppat 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, whyvjpa78 , cbs0at is the phase angle acb,vja7 s8 yp0t 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 needed in a series ce.h ot i3.ad/vircuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 10i.at3e hdov/ .0 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 capacidtg)/ mpem,vj3p),2*kpq xqbtances is needed in series with a 100-W resistor and 15-mH coil to get a)dep2p qq) /vj*gkm tmxp,b 3, 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 wit/;a07ruzi wb mh a 450-mH inductor at 5000 Hz for a total i7 bazi/wr u0m;mpedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz forwa7kr 3ru2qwc)*p3px a total impedance of 150 kW?3pxc7a ) 3w2rkrp qw*u

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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 connejm 4-t17zotv;s7qg f5qmg,6c x 7w)ank+dvolcted in series with a 20-mF capacitor. What is the impedance otv +z -ljd kmca,mgqt ;oqx7f74s6v) 51g7nw at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF caf(b/ f-d 4fzlxpacitor at 1.0 kHz for a total im4 (-dbzf /xflfpedance 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 ;a sd5 b+11ygdmb hp)pat 1.0 kHz for a phase angle of p)b5ash1bypdm+g 1 ;d$40^{\circ}$?

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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 tl, uem4byh,sj( 0q8v yotal impedance o y8lyejb ,(h0su,v4 qmf 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 100-2 5*k,cr o bq//hmhbrimF capacitor at 120 Hz. What is the phase an/ir,bh qo5 *2kmrb c/hgle?

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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 ifuz m e oemt.dp2pq:*q4(md:m.gec+x, a 100-W resistor, 20-mH coil, and 1.0-mF capacitor .zqqd* p:to+xc. (m:pee2emum4d gm, 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 urgm-x ,zum1vdn8t44. blp+)6 txjg dc,lo .g10.0-mF capacitor, and a 0.350-H inductor. The circuit isx,mmog)b -8.4cg +1nuj trzdlgdpxu,6l . 4vt connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 309r2k 2s y. ju9hr2r58bufz bsp W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 622zfsp8yb s52jh.r ub ur 9r9k0-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 se:+j,92vlec xt 7qr9ezhok6 n kries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to7l9k62r 9zcjteoq,eh+ k nxv: 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 necessar /9yv4n ljzpy1s(d*saop4u c(y in series with a 500-W resistor for a phase angle of( py1 *pv(dj9 sl44sna/ zcyuo $40^{\circ}$ 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 =1i1zjbhx1 j4z7cb elph8nn+1hkog4 p1-iv b 6 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have mznv416io4e bpl -1+zkc1hxn7h1b1j ip 8hg bjaximum 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 unh :mzj,pf+a+eo.j w- .s*iqin an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W c:.j*zo,n h+i+ j wapu-smq.feapacitive 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 circ1 o vcec*6 sjl:f*bh+ b.kn0mnuit 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 resistvduxlqse* m-;18l/br ance of 30 W. What is the power f1/e llsd 8m;-b urq*xvactor?

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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 Rk/ c6a;ye ri-jLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when co iarjeck/;-6 ynnected 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 coil in series?c9n7m-btgacx1s5q0 )9 lxcc a:tt j uccxt5+- usxtj t5:)caxtt9 9-1n0-7bcxl mc+cq cgc a5

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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 wix rn:268bjjn fz;jg* mth a 4.7-mF capacitor for a resonant frequency of n j 6n zm:8fjgb2*j;rx10 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 w)xq/fxxt 1y1 n14k hg7cp*p xdith a 3.7-mH inductor for a resonant frequenyxx1 x*p/1k1nf xq)7gph 4tdccy 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-mH b.en7 yv8 .okzw: km3rcoil if the resonant frequency of the circuit iy8 r:b o3k wn.vzkm7e.s to be 1000 Hz?

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