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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 游客未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flgwfmn d/5ugw t(38w2 lux 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 state9.6fma ypb2ngu b3xo)9gm )kl s that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil pp* 2p)un/q hpsroduces what kind of change on the induce/quspp*)hn p 2d $emf$, 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 ml/ psa9anyy7hl /y0.c 4mlw4a loop of wire produces what kind4nysma9a7lp/. y ch04ly m/wl of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kindc, c:cby9odmt8r- vz: of change on the induceycb8vcorz:,:m c 9 td-d $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic fiel gqdgkbny7.twu9342 ad 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, tz+uff+ u8rdc0k;ne c7bl gy:5he direction of an induced current in a conductor will be that which tends to produce whb 5yuz+;k glcrufn: 0dce7f 8+ich 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. y;b *b;gl 7ffzA bar magnet is held above its center with its n ;blgf* ;f7byzorth 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 horizontal table. A bar magnet is held above i*m1sj(s:.7 tqdk q turts center wus qkd:1t( s7*. jmqtrith 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 to m.ocz/hpi+ sq8ah;s0n(0at vp in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above,/ioz0 vns0+ca pqah( 8s.h;t m 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 wher06j,z 8bghc ssty3.yre 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 coil as the z yt,y8rjbs. c630shgfield 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 ths7+yobu6 )mhbe magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced) 7b6uomhb+ys 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 j.7:h6p5ahd gy xmsm 4 ((yjlzcarries an ever-increasing current no xmdsy z.h(g4 5a6yhjj(lp:7mrthward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering first. 3iny.e91k a izxj3b,o As the north pole enters the wire, the in xkzbyo91j,ni ie3.a3duced 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 abo 4gxzcdtq8tctl- s/:hwr1r 6;ut an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis othzxdct;t s1rqwgr6 l- 8:/4cf 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 a l+upgq5ic23qn axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of p2 5iluqqcg+3rotation 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..tv 3*7bjats p
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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 th:vnl50,5cj d gwkij i:at 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 magne h56 f soc435rzaqa4pstic 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 tujd7ia7aio 5w31wx- y he east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential indud - 71uwy jaioa357ixwced 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 rot-iv/u bk5e uupicb 279ates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator tyr(/k9ni b):e4uk icq ransforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. Tj-0e 2 ouitob,/xu gj+t5kf9uhe frequency of tgje, 0otu-bx j+ku5/9ofui2 the $emf$ 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 use /v t1qs tjpm.:jsp5l*d 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 s e.f.wx3m (:s jho fyhcs0(a(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 loopsnlhpb i0*3sr-y .-xx595. pigqfeub)5ro ika than the primary coil then it ip i9yn*. h-rlsubgfe5b-ix ia55x.op 30 rk )qs a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than t(puk+ vi af ; br:i1hz.3kmpiv3k o+n;he secondary coil then iz3pkkbf a;: vhi+ i.(;pri un+mkv1o3t 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 ppgttnjab0ga (vs6n 3r( a;qipq::5p9ower 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 circmosc oq ,n br+5)w*v*guit,

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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 segqsryc9 edn0( ; ,lk*g-rl 7ftries to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across trl;,(ggf *tkecn9qs rld- 0y7he 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 ar vmdv9*j pszyog (/j/835 fvgnhk/yf0e connected in series to an ideal battery of constant terminal voltage. At the moment*8v szfy/9/j5nf0h j/k d(mygg 3 vpov 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 cs)vj- wg( uib iwk+mow4mcod;:. lf+;onnected 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 resistance+ ajxy ipwajcr *mem0 2*7x) h:wgu,w3q+ckb/ 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 *usk(7i )xlsp4 mein 0series to a battery. The time constant for the circuit represink u sime*0ls()4 7xpents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The batu, ba7j5 2;ly)mikc mttery is suddenly removed from the circuit. The time )ku;bia5m jt2l cym7,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 followingi oc0;(:qcym)q o ,mjc have 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 supply. On thic(x/3:( iyewi qwfs r1s 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 connectf:z -*;sfkg iyed to an AC power supply. In this circuit, the curren fi* gk;zy:f-st

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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 frez *acp:s.pqfdf/sb 0qwn9c2n e,1 w23uvq6 ryquenca3n d w vwf*qss6rc9 q1. :zecbu2,yfpn20 p/qy is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage acrb+ocqi4jdr11bc.: / zmgi(r oua0j8qoss an inductor is doubled, the inductive reaqc1(jca zrq +4 o b/jubo0 dr8.1ig:mictance 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 6e pqa hw kvqnf.k8)i.6-z; suthe AC voltage across an inductor approaches zero, the inductive hqk8)zwei6kq;-vp. usaf 6.nreactance 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. /6pbh eib3 rbsr)2u g; In this circuit, the curre/2bpb 3r)s; e u6grbihnt

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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 inox7)5()zvwuz e8syb) tn * gchanges by what factor when the frequency is ngi(ve8)) 7) o xnsyuz*wt b5ztripled?

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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 approaches zero, d( d a,ly.sp v(3qexj1+xid *athe capacitive reactance ofsl,y(vea x.pd(id1q a3j* d+x 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 betweenblnvhgccb1 d 78c:.(a the voltages of the inductor and capacitor in a RLC serich:b bc n1vg(cl 7a.d8es 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 circui,ccz :.os;faa+qo6. z ixvvt/ t 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 imq bp u91flj6h,pedance of the circuit increases if R increases. When is thisq,fl9uh 1 bpj6 statement 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.l. nb*6fq2rg9 fcw+ ap 9xs:bpdg:7sd The 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 imped tvb-/glrrq81 s4vge 5ance 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 capacb31o,x6a krqritance both double in an LRC series circuit, the resonant frequency of that circuitr6o3,a1r kbxq 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 circhi+ c8hl h-x7juit that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuivqf ,2v j(hn5lo l88sdfv8w(bzmhe66 t 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 magnecxl q.a+ 3 6m-nu:a4wwsvbgw 1tic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fwul+3 .a xbqg v-cmw sa:w461nield vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rota 9(9mla5+ 6*akfkgbno gud(a2imca,oting 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 perpendiculag9 iaaab9l +n au,k2d*m(cgo (6f5o kmr.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.2682 m0-v znu ihr/zipx0 T. Find the magnetic flux through the loop whhrxv08uzmi2n i 6/z-pen the 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 arlbtmy/ ha+u t) 5/k: n:rgrfp5ea of an adjustable 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 changeoc7uz f s;uu/ie75+psln0fd.s 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 sdf, stua3h o/jd0* ku7*m 4blyquare frame with sides 18 cm. A uniform magnetic field is applied perpk,ydt7somd ja**uhu 0f4l /b 3endicular 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 ypsh/ siajk*0d4g4/ q v (qag;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 axkff9846t kg vnd area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location whe t (dr;3j nul94jic1kere the downward component of the Earth's magnetic field i c tnd413ljiu (r;9kjes $6.0 \times 10^{-5} \; T$. 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 mb,sr*z5wnfp h+l z/.g 0 kua6y long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in 5,b 0l*f6 u/zgpyrkzs.w+ nha 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-sectionaljjy3o k t7x1-;a+-ob0 sxc sno 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 of wire of ajv4 1p prcm2-mpr(f 8b)s 3qwqrea $0.090 \; m^{2}$ 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 armature. Each loop iuvp-9j*d8a 3gmrmb r9/s(sk q s 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallelss99arqu -pkvg(m/ m*8b3j d r 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, 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 .,vh+9xdf,(d j occ ,gcd ag3rturns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC gejns:,,nj mb ;5qa1soxl0xs p-nerator 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 rotating c, ,axq 0xpl-nsmn1objj5s;: s oil 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 maximpozz3 ku6 +s0 s6e4vaj/vymd;um $emf$ 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 v:g8.jn- ahpy resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistan; p).wjwl3cfyce of 6.00 W. The motor operates on 120 V AC, and wy3).cw ;fpwl jhen 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 connecte:zgek6)i 0ou id to a 24-V power supply. The operating current is 1.0 A. What is the start-up curr ike6o:gzui) 0ent?

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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 m/ 1g vv38gwbfW is connected to a 24-V power supply. The operating current is vwfg3vm g/18b1.0 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 9camxpq0jnwc,6 jp* 9dt :cw9 is connected to a 24-V power supply. The operatinq9a:wc c9mp60d jtw* cpx ,jn9g 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 needn) 9x0ggxn jf) 8xf;heed 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.ez pwb ltbg1 o e,r)ks65a,i8 to flow in the secondarybw1,z,e5pa rg.6tl eb 8isk)o. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary ifupib1;bx k6 f. the 24-V secondary h.b;pixku f61 bas 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 coi +b:qya7r rjj)4dl 3 pdjr3u2el and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the prim r q2ej+lj)r3d:3jprabd4yu7ary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 10003m ode.z 0wcz% efficiency, how many e03.dzz 0mcw oamps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provideslz wl -e6u9k.s 7500 V at 10.0 mA. The primary coil operates 96k uw-s. lezlon 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 turns on its primary coil and 300 tul( ,davnm+r ijimc10+ jj+t(krns on its secondary coil. If 120 V at 2.0 A ismr1d+ +ja ml0j, i(i( ntk+vjc 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 seconww+u;o1o5 i uodary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the 5;o iu+ uo1wowsecondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns h5evx,d ffo/ -and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect/ ,hvf5-xdofe 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 sehgn+gaa,.62 pkh /upo condary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the hno+/p,6u.gkp a gh2a 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 200 turns. 1o5 i)uek1e *qf dj70oef pvdgiq:h7-bq: nx5If the power input to the primary is 100 W, we can expect the power output of the secondary to 5*o7g7oh:bd:i1n)u idqq f ee5pe0jq k -1vxf be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually7xn a8 sq-)h0ntwd g2r stepped up to 4500 V by a transformer and transmitted through a power line of t)hn87-w02 gnaqdx rtsotal resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stephj4u 60/wa) uhs nr7xyped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission s urujxw7n/ah 6h40y )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 Ah jve y;jt77f* of current 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 tvje7;jf*ty h7he 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 liry*( pq( 9 d6d:yuuiqlne 50 km 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 turn(rdi9 uuydpl: q( q*y6s 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 resx)+q/bbcb pb2 y16sgkistance 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 original enexkpbsbb2y/gb1cq) 6 +rgy 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 less power would c6a ruzzp). ywhe98o 2be lost hca y.9e)p zwzr62o8uif 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 ;p+s8ve ckwi5to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be k8v pi+5 sc;ewstepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored i)i vyr 8cw6vq/n the coil's ma rivv8c /6qwy)gnetic 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 k0f9 dsvm2d t7an 18-H inductor. What is this circuit's time codk7 9d2t0smvf nstant?

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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 circkstj5/ a*2r;*mvdph4ox dj t*uit 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 outletxjdkdx;ur)9( . 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 og9vw5 / aqyy:;p ,p:rqqclx, outlet. What is the resistance of the lamp?ycq/w,po,vxqa grqlyp:;5 9 :

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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 isnxc (gvt.dh-z o+ ;6z q.mt4qm the peak current through the resistor?o-zmq +4zhtcnm.qxvg; .( dt6

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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 dph /o*qxlaf3y df 1v(u;k7j 3120-V ac power supply. What is the power dissipated in the resistor?d(a1ou vhdl7fk f3x 3;qjp*y /

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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 5 l dmzwae nph/*6z;3lod/5mi. 0-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resg0p m)cg9/ iymay .x5cistor 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 isjczx;2tu uz2:o: x+flh p(qoj4gh5;s $I = 0.80 \sin (240 t)$. 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 Hz?j l7yd+igg 2 :3s9turg

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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 1000 Hzu19,k gepr-w hcrta,ssc9ii, 4f j5+m?

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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 1bh42vlt6uf2 ((wng: wfk+n lf 4.0-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 rv dehl*e+ad,:eactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a fresx2dkm 2 bp3,nquency of 20 kHz is appli2ndp b,23xsmk ed 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 through a 2.50-mH coil due to * /k ze)pfpbt9q6u*0d 7pi scga 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 1.f9,3 d0n f0j+mw* 2jdakl.kyb qaa vn0 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 capacitivepit -x bfeu7 (,wo/v1g 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-.+vas0uya z:n sw3)3ht.guck 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 capacitive reactanceh xg)ro.ver o-0 ws2q) of a 0.010-mF capacitor be 100 W?-. 2g )xrevhwqoso0r )

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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 capac vbw*vr22wb4 csg/8of8.k b07 n1jnqll8zfnoitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with nxi-pxbaagg m / e(++a* f33g7mxnaa :12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance?a / fa* axa3a:7gbm+nnx+e-igxgm( 3p

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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 im56zzzt5dl 3so5 ujeas l9,lk6pedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?d96 55k3zz5oalze l,6st sluj

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 8 ;ih u8hmfmc egg8/vhi(l2. m100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?lm u/;(hi hmmi e.gf882g8c hv

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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 inductor, w5r ud:er/)kjlhat is the impedance at 1000 Hz rud:ekl)5 jr/?

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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 sepsw+ m k 1r+4w)+8ofzydoom0eries with a 20-mH inductor, what is the phase ang+1eosd+4ok8 z mmyf )p+w owr0le 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 needm cus3prg o-2 r5pi5y;ed in a series circuit with a 20-mH coil and 1.0-mF capacitor for a to5rusp om2rpiyc5; 3-gtal 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 capac jc3aiw e5tr-6itances is needed in series with a 100-W resistor and 15-mH coil to get a total5 -a3ew tci6rj 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 witcf zmqtxb(,dn:3;6ah/ ;2 *d t ttjwgjh a 450-mH inductor at 5000 Hz for a total impedance of 40000 z6f2 tg a;*qjjn bdm3txhc,/wt(t:;dW?

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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;(n yenfpkk(g an ,3+k with a 100-kW resistor at 1.0-MHz for a total impedance ;ykg,3naef+n(( k npkof 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-mF capacitor. What is th+um(tzwxlm6. mh: u 9ce impedancxul9 cw+m.6m (:uth mze 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 n)ra5hyqj qf 6s;b3vjoo:, g b)eeded in series with a 10-mF capacitor at 1.0 kHz for a total impedance of 45vya; sboj6jrg)3h:,5)o f qb q 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 ikpwvbfm1kl19:ua 7 1-mF capacitor at 1.0 kHz for a phase a b911kp1am kwli7 v:fungle 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 1s ly -av :7ra.30lafyg.0 kHz for a total impyrsy. :ag 0l3- vala7fedance 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. Whaz4h3e+l,k s7ol 1f g+6lqnbrzt is the phase angob ekr7n,l slzh+qf+6zl4 g13le?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-hgj8nw 5j,,zbty l.:c q2o5ctmH coil, and 1.0-mF capacitor are cztyt gjq5woc 82n :l.,bhj5,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 10i: vi( zb i,x,25loafc0-W resistor, 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 current in li c5z:2biv (o fx,ia,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 cs3etha(8j0vx apacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circui8 vts0(3jxa het?

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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 serieo7iid 2ig9- yxq57y fjs RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz poy2qi 7 id f5jxyigo79-wer 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 necessarl 2aja2ncxa:kghm/yh 511;to y in series with a 500-W resistor for a phase angle of nc :oka/1;ght mx1hja5ayl2 2$40^{\circ}$ 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 c-zpkxdq2(9d. At what frequency should the circuit be driven in ordeqz9pd(x c -kd2r to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15.0tfq43lm hb-7o cbfn4 a-j13,x)c ecr g W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supplyb1a )nr4 -lfjc,geh4 xo7-bqc 3tcm3f ?

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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 inb5 ,d0tkkmwx/:pygx-7pr/ 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 resistanc, vb :dp0yacju6 )v/ake of 30 W. What is thk6 )vcabu a,jydv:/p 0e power 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 circuit contagstia19:( e 7i quadq/ining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz powera/ tiq(e u19sd i7:gaq 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 frequencyp0:-,wttbnrq8 *:awz q3 dugz of a 1.0-mF capacitor and a 15-mH coil in series?0:b*w-z,qr dqtnzp wt83ga: u

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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 seiw:j re:4x( tqries with a 4.7-mF capacitor for a resonant frequi(4 xw:r jt:qeency 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 8yo+x*k*+u inl dhw w0ffg8*xin series with a 3.7-mH inductor for a resonant frequency of 1000 g duwf*80+xxi*kwl+ fho ny8*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 ga1 wm;5uq/ zpt2: ffg o*xjt-series with a 30-W resistor and a 40-mH coil if the resonant freque 2ft:o umatqjpgzg1 ; fx/w-*5ncy of the circuit is to be 1000 Hz?

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