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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 ofghj 9nljnm 0;) magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states th41vcp ) dfd:t4-bfpjcat 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+d4my 26o i( ztnlcl3uiknq;( a coil produces what kind of change on the iz (tk4lo;2(6 qmlu+3c nnidiynduced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire pr+h 6(s ausnl/poj99cjoduces what kind of ch 69c(nljohu ap+j/ss9ange 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 wif9krco8vni2y4t/m n ::uksa8re produces what kind of change on the induce o9r2fk ask:i48tmnu/:8yn vcd $emf$, 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 magnetit k rm7;ublq,e9ocy.k,+ r*+4hmfq sqc 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 direc xft52*m-gg-8 jvkl xbtion of an induced current in a conductor will be that which tends to produce which of the xblmg *- k-xg 8tj2fv5following 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 horizdddqi;t 328fxtn4b1u.l . mcpontal table. A bar magnet is held above its center with its north pole pointing b..d tp tuidn 4df;8mc32x 1lqdown. 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,zwp(0gir56izuyh(bx dxyc/ x9. 5 ll 8a6gco flat on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and ya g6(z ixdx5r cw/,0(8o.gi96bpx clyhl z5ureleased. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magne+r wn2id (hj1 t1-z k6cmu1urj*ee.wr tic field vector points straight up. The magnetic field vanishes suddenly. W6rrcmwjkiue11tdzw*(.+u2hen1 jr - hen 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 whe a, xt;pcgldya 71,3mxre the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced c 73maay c xg,1d;lpx,turrent 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 4fdj 6qzj gkx:z;1jo .magnetic field points straight down. The magnetic field disappears suddenly. ; .j4qk1fg jx:zzdoj6 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 table and carries an ever-incrw56 3ixovt3 pyeasing current northward. Two coils of wire lie flat on y xv3pit36o 5wthe 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 wirvcbp 64t7 l(gu13d;jgowu 5 efe with the north pole entering first. As the north pole enters the wire, feg4lwd56b 7 pu3j(u;c g1 vtothe 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 rotat3l7;s kx4okw eed at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop4sk 3lke;x wo7'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 rot/ a16vtg rgd9yx5u- u09 tdf9v)kcestated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, whg1rudsc9aut y6xdg/ev)0-tk 99vf t 5 at 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.sckg( w/7fc 9j
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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 tr .w9ct8rh 5hthat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic fielcv1e/bz a7 w+dd. 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 (orie8co wz: mi9 r+5rqg(ignted in the east-west direction) is moved northward at constant velocity through a magnetic field that9o(g w5 rcg+zq mii8r: points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a .+ kuyiy0g hcpi*py u)1rp3 408etucwconstant 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 transformvt0 1t*lb-qmn v.r 8tms

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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 ta 1rx5iv1no3iskvq )t s82 zx*hrough 60 revolutions each second. The frequency of then 1s trs1zxi3kav*qx v8 52)io $emf$ 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 de 2g4aanp(xog i22kxli on.x ,9vice used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device .vtwy+7r.pp 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 c4i5ry:krx: iyrx ;eg.oil contains more loops than the primary coil then it isi r54i:r :xx;kg.eyry 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 y)zj )mgpe p.7 vnl-wbh g1.1ythe secondary coil th-eg1.wmh yj7vbpg)n1 y)zlp .en 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 izkf 33a36xsj cnput

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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 cir.v-qiyki1h( u* edyg2cuit,

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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 tc+vo//a*qh; xohqz*c o an ideal battery of constant terminal voltage. At the moment contact is made with the battery, ;q/ xo*qzco avhhc+*/ the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are i9vq;1 y2 , w2gkx7xeej9v, brs.iojg1.wcut connected in series to an ideal battery of constant terminal voltage. At the moment contact is made t7bxgx ,j v2q91gw1kv; j.i. iweey2sru9oc,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 ca2l*ljuqm nnp347v4p+ tm -ban $emf$. 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 an hb. :lnlcl6i 6qrh k-f3(jm:md 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 towquy+ q+rp1 z7piv .9q a battery. The time constant for thew+quy p7.9+ z1qqpv ir circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in ser;yv:nr c w7stwgy* :+mies to a battery. The battery is suddenly removed from the circuit. The time constant for of the cisynyrcw 7:m*t ;wv:g+ rcuit 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 haveerip*l1:w5 m b 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 this circuit, thex u(i0b58;6ztts-e k4rsdcxb current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In thisk08,j;un3tixbnc /m f circuit, the currentcn/xmj u;3n ifk b08,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 circuit ch5m kl9ri4z ,bjanges by what factor when the frequen9 b, ir4kjl5zmcy 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 across an inductor is doubled, the inducf6m()yfr3uei8z u .tttive reactance of that inductor eutf6ry38tiuzm )(.f

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approacp szf2.f dz13jhes zero, the inductive reactancedjzs2p3 ff.1z 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. I5 pl 5c1..cq ; urmywbouj88gb;gb kg2n this circuit, the currentb8g;18j 5;mo.cug.ck 5b glrp yquw b2

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance ib*erdez g69c * ,tejl7n an ac circuit changes by what factor when the frequency,derbg ec* el7j6 t*z9 is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor appron/wv)7q0 atv taches zero, the capacitive reactanc) n7atvtq0/wv e 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 betweenhu kehldt( )80+jwbh3tw75 th the voltages of the inductor and capacitor in a RLC series circuitjht+t ebh()7tk 0wdhw5 h u38l?

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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 -0asq8yk)v jekw:p*(affyr3p5z 9 dm RLC circuit 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 impedance of the circuit increases if R increase;an lvsp -lyf -q 1t4r//iwa du.nq)k*s. When is 1/ a - ny4lqdnqtal-*pwfiv.);usr/k this 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. :u 4me:o8wghh 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 impedance of the circuit increasetig(ci88 a g k1bnl5j:s 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:l+yas-jnk 1 d)zh+v8lkld (m both double in an LRC series circuit, the resonant freqn( l lvhdkl+-kz18ays+md:j )uency 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 drlw z7e(z1 j/vktb 1)laiven 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 RL;+uogvftk . h( m7gtl2C circuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fio1iq9f ,afdx t5pu6 7oeld of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are paraop xqa9 ,7of ud516ftillel.

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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 + gvc+i2f9th juniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector a g+vj+hct9f2ire 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*rjf7*5 dm0x; 0azkwb v6aapq a uniform magnetic field of 0.20 T. Find the magnetic flua m *xp0;5dj0 qazbk*wrv6 f7ax through the loop when 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 arpjrj9nvi59ug;kapd48/ : c ty/;s dofea 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 cnm dbo,i;ff7 )c)v,p khanges 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 sh)yz2fu1o u1pquare frame with 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 v f2)ouyu1z1p halue 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 a6egz or*,i oavt 75v3fnd 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 arz t qa m b;1tgs0v0cpfpu(2z/(ea $0.20 \; m^{2}$ 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 )5fk .vy63* spkvdeg ma location where the downward component of the Earth's magnetic field i s*k5mvy6)vfd k3 .egps $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant 3y3rm4 c/ elllangular velocity of 2.0 rad/s about a vertical axis through one of its eny4l l/ e3r3mlcds while in 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 lpwo 1u*kr+ 7agoops 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.c((5gm ionl s turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loo1tl7: kseqj/ tp 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 perpendicjs:t/71ek tlq ular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns ogzlg3p+:d * akf 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 genex.5xhm +hg4gr7jnw dj6yx0 ee0//w/ea h q 1qcrator with an output of 12 V maximum when rotated at 60 Hz. gx4whj.7qdye0/n jh1eeh q5gx06/m/ wcxa+ r 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 gv17x p26ycw(zz4rgg+toer) generator 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 motorc h.ms0mnz4 3 +qiqw4m 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 resistance of 6.00 W. The mot8n76g3 a unmyzrqnz2 bra556 uor operates on 120rm6 5 n68 yu7gzabar z52q3unn 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 internx.10) upkd4 e5belez ial resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is )0pxbiz d 1e.euekl54 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 r;eivtp+9f s r-1 *xx acy:kd,desistance 6.0 W is connected to a 24-V power supply. The operating d;x :i* rf +dx-vap9c1ysk,te current is 1.0 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 renph eee4:ycr:-)p t;gsistance 6.0 W is connected to a 24-V power supply. The operating current-;:he)ye:4netr p pgc 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 a pr ,4asdomea 2whi6ix7t 99yfb8imary 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 tkf8.yxt0 c7 azransformer causes 14 A to flow in the secondary. How08f7.cky xtaz 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 aretid0v -kwd 4 y)ez.s4a necessary in a 110-V primary if the 24-V sec4d4a iy0 tkzve.ds-) wondary 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 ofoel1 hvl*, b e/zxv; )skp:aak24p 6tn a 500-turn primary coil and a 2000-turn secondary coil. If the curea1 z/lh n:;* oxpek,p bt2vka)6vs 4lrent in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% efficiiucig+xs2 62y p7hc4qency, how many amps at 24 V can flow in the seco u6s2yg+cc47p qix2hi ndary?

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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 pr ct4r+psl)9 lqovides 7500 V at 10.0 mA. The primary coil operates on 120 V. What dotc) r lspq+49les 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 turns on/ rrldgn 3gg-i6* ;nap its secondary coil. If 120 V at 2.0 Arrn* a6 ig/p-3ggl;dn 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 itsd8ot , zt)zxi;zb;2 lw primary coil and 300 turns on its secondary coil. If 120 V i2z otz 8t)x;db,wzl;at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and 0ktax*g .qmxdmo4,:u8e 8h sr08qjrw its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current 848at m.xhr: ms g*,dor xwqkj 80e0quat 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 seco8e pn *d5knm8rndary has 200 turns. If the input voltage to the primary isr 88k ndep5mn* 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary v1 p ,gi 8ftx j,-bn-zee:x0afhas 200 turns. If the power input-xgtef,nab :i v8,e1xfj 0-zp to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60nqat 9kj3mp kxd*)w8*b /pfk7 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line o/j*)ak3bpm7n8k tf9 k qp*dwx f total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of currentluk8lx9 (cy69 adz;7 hdmyqdo cw .-7w 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 percenc.dhcqm79yakd9ol7 l w-8zu (yw ;x6dtage 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 currbbmdb s 6 /:a10m0z9kfzh os9ment 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 percentagz9ssmz6 d mba0k /b9o:bhf10me 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 5cv8dcp 6.e+vvi 1o:jh0 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 turnsoje id ch. +v81vvc6:p ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A geneuo1q34,i m aekg- k)gwrator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost whe3 1wg-4aqie u,k)kgomn 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 100)tw(v+vxmn d2 u6zc2b0 V. How much less power would be los6vw)x c ndt v+mub2z2(t if the power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be tranzr6t lqj 3o06zw,wm x8smitted on a line with resistance of 0.60 W. To what voltage must thwx l0rtq,m636zjz8 owe generator output be stepped 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 .v q rxl6tl73tjy6xf,current of 5.0 A. How much energy is stored in the coil's 6j.6y rtlfq , xxtv7l3magnetic 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-Wt.)augy z wnxi5m j9,y7q0, qe+c.vu j resistor and an 18-H inductor. What is this circuitejvuz) c 7.n,yy,g+ q w.5x0jmuaqt i9'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 (u;not*vui(0vk hr6 g nuts *17adr: uthe 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 iv 9r9)*olo x/db1cmofhmhp+3;(nud -V AC outlet. 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 the/rpp/; b bp8(c ;azjoz laj/ozb/;p;c z8pba p( rmp?

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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 t)rttcd6yjo9 p 7wts98he peak current through the rts 86 jot)yp9dcwt7 9resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supplf5,ameyjpqgp ww)x4*1 1tl-y q+ 8 cyiy. What is the power dissipated in the resisyw,1a5pe*qqpt)l1+g wy8-yx4 fm c j itor?

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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 5m tfcd/(qm(zv)hwo7 ;kg5 kh* 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 5:x+f;eyup2ao3o776om c(r k iv7,vu dvkt h.u0-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W rcti+l79iun 6 kesistor 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 1z)lo2w+ ) uo ukw*z;f,jkz eo).0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil uiz beae1c9n-;r; i*rat 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductipa* ipw++yk tq: o8z6mve 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 dt7x1 b iygkd(o i3:bi8qe-2y for 157 W of inductive reactance 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 why5 *arv;,s d iz74.wljiy3 ehten 120 V AC at a frequency of 20 kHz is d *j7;aw54 .yl,z3iteiyv rsh 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 through a 2.50-mH coil due to a 1*,gcz m go1 5fbs:c)h juinavr*3 x+xe(+9oin 10-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 capacdteglxs( 9( 2ptdh.n17iby*nitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capauvtwf, zq(on )46zw)qcitive 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 reactance 2x 4iiiac 6id7egfrs0yl5 af8+g y7) gof 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 0.015x(zk6 q(tyhl0-mF capacitor be 100 W((lzx5tq 6yhk?

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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 100sya:1pojm 1sd)m47z-rs er6 c0 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 w5b;dq:xdo ng *z(y5ovith 12.0 W resistance, 15.0 W inductived5; g *y zqb5v:odnxo( reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil,. hab*f2y 4bk85vtvqs and 1.0-mF capacitor are connected in serieskf4ah2.*vby qt b5 8sv?

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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 100-W resj0n2 qa htaagg:lsf89.k8h, p istor, 20-mH coil, and 1.0-mF capacitop hg2: a.akf8la0t 9 hjsgqn8,r are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is coet) sqo ) hxw13zmnb*nye-*d8.atyt(nnected in series with a 20-mH inductor, what is the imped.** )(hn)a3x ztw - yndtyqm e8tsbeo1ance at 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 (s0ge + e/lxzhin series with a 20-mH inductor, what is the phase aez sx0h+/le( gngle 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 needed in a series circuit with a 20-mH coil and 1.0-mF capayc4gmq55yd( xcitor for a total impedanym5q(dxg c 45yce 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 ca/;3oyfo11b9im vwq v)ezqk9 ypacitances is needed in series with a 100-W resistor and 15-mH /13q9y fb1)iym qookzvvw;9e coil to 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 in series with a 450-mH in.o(nxou jy9:)ueg u,d ductor at 5000 Hz for a total impedex9:uguo)oy.nd( , j uance 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-Mv*ncdxiqj 0))j es)1dHz for a totv*1d0qc sj i)j )edx)nal impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series wir3r n)l3j6 w*lukj5j- suc/iu th a 20-mF capacitor. What is the impedance atlnr)-j ks3lcjui /* 365uruw j 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 capacitaog/y bi(zw/p/l-q :gor at 1.0 kHz for a total impedwg (gq-a//i/zy ol b:pance 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 -liidg.2 ajt3 j g.p5ea*n.)-ckpg sb10-mF capacitor at 1.0 kHz for a phase angle of2j g a.p-l*ng cd)ts gp5 jkiia-.eb3. $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is need 8kmyu4vmy8px 7s/5jyed in series with a 30-W resistor at 1.0 kHz for a total impedan84y7m/m vyjs8x ku5py ce 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 jo9/icmveewp8r 6 0 n0at 120 Hz. What is the phase anglenwj0om/09p8e erci6v ?

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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-mH6q m1jzeea 1f*.or xysh:vn6) coil, and 1.0-mF capacixs6 1j) eo: .anrqh6z1yfe*mv tor 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 rex 66erbposg -syby8)wa;l10xsistor, 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 bbrw 01yog)sx yas- lpx686e;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, 10 dt4vc5 zonxand an inductor ofcnx d1v5zot 40 inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC cve coxdaslt;b)sjh ,t .-54 7uircuit containing a 50-W resistor, a 10-mF capaxut.- cs7jsdt e ;5ov,l4)bh acitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phaeb 02*6mx h)iq.hgkp:ha3 drwse angle of .) e:3rh*2kidxb qmghhpw60a$40^{\circ}$ 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 =(lzw hv z+zm/83s;ezh 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred fro vh /3+zl(mz z;s8zehwm 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+pv.jbcj snhj99 u4-z series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V pv-b9cnzs.j4p h 9ujj +ower 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 cirke ss/b(dmh8+ cuit 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 re8v8 -f0x )t6vea 93sbsbzggrp sistance of 30 W. What is the power fac9s0 vra6gpzebbfx8ts g38 -v)tor?

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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 serieiu97 k8ptgi0ee3f clv /4fq+ bs RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H indui /kufve 8cl p4fq7b+ 03itg9ector, 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 15iq06sm( c)sj7x;nu0t c1qg j p0cvsh/ -mH coil in series?0 hj0vxq;( s 0/ 6ntj7iqsuccc)p g1ms

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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 seriesxs -0)wpw l5zw with a 4.7-mF capacitor for a resonant frequency of 10 kHzp-wsw0w 5 lx)z?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant fre+uhd:y) xor.e quencydx ey+ur) .oh: 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 rpx 0et5ptiu5,hmp; *with a 30-W resistor and a 40-mH coil if the resonante,xrth;5p* ui0mpp 5t frequency of the circuit is to be 1000 Hz?

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