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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 my29qpfy -n l.)xwu /yiagnetic 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 inducdyyk*1 b uczq3wm35v7tion states 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 ofyhrrawt1*/bz +4vp4e+e rs m* loops of wire in a coil produces what kind of change on the induces*ar4rhe m+ be/+1pw4yrt v*zd 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 produces:5fu 1x jzd j9w2yv6vr ilp37v what kind of change on the inducevj7v ru pw163z2:xidvlf9y j5 d 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 prpp()+2zd, x3jn 0v : vfmwp4zm dl+axnoduces what kind of change on the induced fwd0mp4v3 vj ,m :2zdxz(apln) ++nx pemf, 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 field pesl5 p; qtdb0i;gs45an emf is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced curro/e)5 d vmefil(sn/q+p:my jg 2k* +bqent in a conductor will be that which tends to produce which of the following g/y++p o5vl2q)mmse/bej:( nqdk*i f 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 is)6l0s6d jd ,j2ll1xgt8hkm k c held above its center with its north pole pointing down. The stationary magnet induces (when view2j c0m ls8 dlg j16)6klxkd,hted 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 liess j*q9yx:ydj. flat on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from ab*:s9 q.jdjy xyove)

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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;af/enj3 cbr/ region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil br ;c/jef3/a nas 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 9tza3gm8zv 1ag/p ,vere 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 asa8t/1 e9pg,zamv gvz3 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 whereh54rux)scd ;h* k n pf:-scf0t the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from abovu*):f-hkp; 5 ctssc04 frxdn he, 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-incregjav1 68(w0(hu uv vflo:lm8 yasing current northward. Two coils of wire lie fla1u(wv ov6fgyjv8h8a mlu 0l:(t 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 n8h-xvgk4 0mmc90 2 i)qky ybtof wire with the north pole entering first. As the nogm0n mcy-y)hb08i4xk 9tk2qvrth pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed u (j0 xf ;w0n/o ;wmzyuc;-wymabout an axis whose direction can be varied. In a region where a uniform magnetic field poiwuzmn f;/j-yu x00(;oc;m wwynts straight down, what must be the orientation of the loop's axis of rotation if the induced emf is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whopf)/.d hp7 ,h6ibrcsose direction6phrf./7,dpob h ic)s 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 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.yi:8b b.o32j c vbvd pay wsd,,1q*4xx
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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 z s)bi/ek-3 tsan 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 fieldkeu; qgp:0(kih o0xc2;g *. t:occurmn u59fo . The emf produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northward e9 k3zhjfc;hq+ (w ;dkat constant velocity through a magnetic field that points straight down. Make a;kefkq9h(+j zhw; 3d c 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 angulaffat (+tbsh f1()949vg u:iqf+eddsa r velocity ω 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 t)fa;(xtow:3d fwhn4 *yjorjyg *:.saransforms

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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 6v 8lya)2osdw* 0 revolutions each second. The frequency of thew*lov8da y 2s) 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 t( hp:f 58kxjc,d7lzl so

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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 devi:k9kr i-q2plg ce 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 lox.f;zwb t*.t1y ga uz,ops than the primary coil then it is agy.;fb,*z.a z wt1xtu

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the se/*vurernv6qr m+ 0tv4condary coil then it is *v4vr+v/ r6nm0e urt qa

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, theyt5o z+4wyht :z ea44d 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 cgj50ri )nrm+)0tybh wg dr:*ur4t /vo ircuit,

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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 conn r3es/uz. 3plkected in series to an ideal battery of constant terminal voltage. At the p.3/zskler u 3moment contact 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 are connected in series to an ideal battp4 o0c*9yfoteery of constant terminal voltage. At the moment co4*y 0otefpoc 9ntact 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 aah)w) k2v4 wdand 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 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 inducauqo5)*qvqiyem0z 2f,4:gxc tance 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 inductv o3 q/14lvhxfor are connected in series to a battery. The time constant for the circuit represents the time required for the current to reac ohq1 3vlv/fx4h

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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 battea3rld(p1r8h ary is suddenly removed from the circuit. The time constant for of the circuit representsar3(r aphd81l the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units except*kdr48r9k* hrg(ca mb:

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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 circuisw,m k9.l -+qblvzf:dt, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply.x9;howpjuy8bw3 3e6 / nee4ky In this circuit, the currentpeuwejy ybn8h/ kw36o3;4 xe9

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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 fdl-ais3 +up -f.pygg5nc3zr 8 requency is trig+l-i f8y5pscrp zn ud.a3g- 3pled?

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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 indu,rb73;lv7f z20ejwrl h f79w*p utupgctor is doubled, the inductive reacta0gfp3;7w9l 7w7 l*uh,jt zrupreb 2vfnce of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, 8rtuz9 z0u57 g x(vlbdthe inductive redzb 7g(u 8v9 xl0rzu5tactance 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. 2e k vcwl/.h3xIn this circuit, the curre 2.wv3/xkhcle nt

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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 wha pr+huczrqv51s ( 4n4 yx:)exst factor when the frequency is tvh+r qn(5uyxe:4xsp)4sczr 1 ripled?

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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 approacgs w/ a4 +0;+tl/w r8gsspna qojon0:ches zero, the capacitive reactance of that capaw804sro+s+sqltg ncg a/onpwa j: /;0citor

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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 volty:hgr3.h d gd)/8m(:ft rsew hages of the inductor and capacitor in a Rdyg8w.mf:r/ ts)h ( g:eh d3rhLC 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 b7 d5rr5dq/ opar3j .ydefined 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 p8 e0 4ot; c7swvn/skqR increases. Wewc n4s0s;t/v78oqpkhen is 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. The impedance of the circuit increued dild 8 q2,.fla317o e+,ckkz rpy.ases if XL 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 2ftyy: lvaw.7impedance of the circuit increases if XC 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 seqo2b 3st9yamr y251cxries circuit, the resonant frequency of that circuit wbqomy 2 t1 sr29y5xa3cill

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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 1lezty.w:f8 gi,p7 qsvoltage. 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 circuit occurs whe+uf2a ciweo5e) 4y+ fdn

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of 4.0×10−5Wb 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 m7jn1o ) frw(bw xyyd/. is rotating in a uniform magnetic field of 0.20 T. Find the magnetiyfwj 1owr7d xby()n /.c flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 oegykp k3d6i 6, v2a)(ewdo6k0 p jwf6m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop anddf66(3p2oea, idkegpvokw66)jkyw0 the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnkaxaax1xnj(tjo )12x j .01 esetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop 1 x)aa(12x1j xxja no0.ktesjand the magnetic field vector are at an angle of 30∘.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is redufic/j/m h9 k/uced from 1.0m2 to 0.50m2 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 changes from ,z :b8)vesl8ye+zc vz4.0×10−5Wb to 5.0×10−5Wb in 0.10 s. What emf is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame kjs.730 1g8) xv6kdbcewzv uowith sides 18 cm. A uniform magnetic field is applied perpendicuk0be 86jkoxcv7zv 1 )3d .wusglar 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 an arn5dkt3)45v/uku3go5mr b(b,cnwfe f ea of 0.40m2 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 m (c pu f.bqm5ipl5-mosi,n:0 area 0.20m2 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 whem0 rlj0z z2w9 gzeb4n/re the downwzn/9bz lj r wg02e0z4mard component of the Earth's magnetic field is 6.0×10−5T. 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 angular veloci2p0a(rxyl *q-2 nilpm.e1q a qty of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic filqy l*a.pqx ai1-02eq m(2rnpeld of 5.0×10−5T. 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 andh at27+b9c0 xm6ht3o jg,bqz h a cross-sectional area of 0.25m2. 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 tuhl9np0 p4r 6pom-( dwkrns of wire of area 0.090m2 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 lomz)nx/evgpyn 0c+ /t4ops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel toc+yz/ )ep/n 4txv m0gn 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 turns ofwotbi; ezd +kn3 84* b8)uxseu wire of area 0.090m2 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 generator with an output;/,fuz7 0d *lnf/ m+eemw 4teuhpu)n i of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If iw+ed/7 )h u*;un,m fpee 0uz m4f/nltthe area of the rotating coil is 100cm2, 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 w:pci)( meofm y2//ozxith a maximum emf of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of 0.030m2, 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 resistancw,km:jso( fj;e of 6.00 W. The motor operates on 120V 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 motor operates p28hqlr j0,52jjiasmjx a8 - eon 120 V AC, and when rj jajq5mshxp2j l0rai,-82 e8unning 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 rotl/7k /szi v5esistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up cv/izl k 7/ts5ourrent?

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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 resista2mq(x ; g1eh bnua*i)rnce 6.0 W is connected to a 24-V power supply. The orqmg(xeiu;12an b)h * perating 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 resistance 6.0 W is connected to a 24-V power supplyriu . golx2/qft*ln ez006 j7b. The operati2nzb7 0q/60. uj*grlf tl ieoxng current is 1.0 A at full speed. What is the back emf when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltage ofyl)6+9:tn wctuk xzz;kh** ln 120V AC to 6.0V 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 causiqgftaf7pv (jg,mnxj9 c:0+ 4es 14 A to flow in the secondary. How many turns are in the secondarg n0,:i qfxgt7fp(+cjmv j4 a9y?

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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 24-V*9yi4,/i r;syotxx zd secondary hasti dx, ;syyi zx*9o/r4 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 pr/nx 3azck9i8b imary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, w 3bnkz ai/x9c8hat 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 ire/dm ir88 +hotj0eh;(5xcg nn the primary of a transformer. Assuming 100% efficiency, 5e0c ixon8rh r;8m j/+e(gdthhow many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon signgb6hyb )h6,g vt7zu 5sn)0qtl transformer provides 7500 V at 10.0 mA. The primary coil operates on 120gqz,lsvb uht0 )g5tn )6y7h6b 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 turns on tvh2tsm*0raapqoj g2.,d:9tf -wvu 4 its secondary coil. If 120 V at 2.0 A i f*,vv 2jtdmwphtt qag 0:2osu.a-94 rs 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 300n4u9 wkehpp4(+eagt( turns on its secondary coiegkphpt9a w n (e(4u+4l. If 120 V 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 1n)qdckp7*w4 c00 turns and its secondary has 200 turns. If the input current at the primary is 7dp 4*qw n)ckc100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a tranhs3a pigf-)1 ci5hoz *sformer has 100 turns and its secondary has 200 turns. If the input voltage to the primarys5gc) 1hpa i zo*h3f-i is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns a3t swb72r)w pgra /jw,nd its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the seconda/w)sw7b3ag 2rtwpr, jry 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 u0sbrj3e x (si(j(r 8i6qz;ypvoltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total3y rre(qxp0 b8;jzi(s(s6j iu 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 :m1kdz gv(nmq4 /t;mi 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 qm1 vtg;4/nmmd zk i(:in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The * ,fc lppe2j,w22 pwlavoltage is usually stepped up to 4500 V by a transfora2l* ,cl 2pwe2p fp,jwmer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. foq. .h6 l:dqz A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, th.qhl.d:6f zoqe 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 50tnnvmv,229)z a (gutk 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 transmisa2)nvtukvm, zg9 2t(n sion line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at5rya4-l xgqz-yu 7kf .ch6h.u 1000 V. How much less power would be lost if the power y65 xakqlgu7f hh u.4r- -cyz.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 Am0m*8r p mlno2fn3j* e. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformefrnn *om30*pmml 28 jer 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 i7 mb)ihq0 o:bps stored in the coil'sb qbp:mh)i o07 magnetic 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 fo6 (nm,b6v)a.k v* cprh .dtxd,,fqea 6.0-W resistor and an 18-H inductor. What is this circuit's time,,.v d6k,cnof *bf6.xq d )(e atrmvhp 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 voltag 9ac xe.6-fvxqe 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-p4r eo+h(i.q cV 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 tik7yl i akz6,afnn/pd x0)* -lxi5n4ohe resistance of the lam ol6 /nfxikny-i7z kna54i 0x) l,pa*dp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the bj9:-i b sl t8,bxnk(zpeak current through tht:9kx l bb s-z(jib8,ne resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supplf3lz 5zy-vhe r,n k awe;9)ja6y. What is the power dissipated inl6eva kz;hj an )wy-539z e,rf 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 5k g-pznu:+pv9vjs nde4u6 -g l ,28qpr0-W resistor is I=0.80sin⁡(240t). 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 resistorfh*q n- ebz8aws7bc8cous -92w fk;9i is I=0.80sin⁡(240t). 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 a.fi8)t99 ijh2qsuu v is I=0.80sin⁡(240t). 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 3-e2 ga x7zzjwinductor 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 inductivexr6prkfqz:np w0xf8 u 5, p2-y reactance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH co5i*voo q f5yf6il 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 neces :tkwqu;ovv2kqd4q ,mk o1d05 sary 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 when 120 V6g,u /aa)hqg x AC at a frequency of 20 kHz is applieaag) ugq,x /6hd 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 ontyco .-wq)*txya5l; j2g f9a 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 h pml-/-r+*qojwwa h -reactance of a 4.7-mF capacitor 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 capacitive reactance a8w )xa1a x:vhut 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.lys*9 xnoj5)xk9 iocce 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 reactan a:p /t;o 84.cyfwkcibce of a 0.010-mF capacitor be 100 Wf;:/.8ica k4yo wcptb?

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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 throughjx9c7a d bwx cwtxy )wa xs,h(b1)h 4(rb)ou69 a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 1h -i7 wabk227fz6yz,z/ s rv6e u4izcj5.0 W inductive reactance, anwkf4h6i6 cruza2-j ,7zs2/z zvy i7ebd 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 resis5hw zdv 2;bu*uib4s6ptor, 20-mH coil, and 1.0-mFvsu d hw*5 2iz6;bbup4 capacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, fx85j/zxw sh 2od 3d/f20-mH coil, and 1.0-mF capacitor are connected 2 ds/xwojffx8h/53d z in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, w wr+//jh-ag xhhat is the impedance at 1000 rh x+ /gahw/-jHz?

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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, what is the 1 3jdr758ir2a el fjaephase angle a l7jf eie3ra8ar51d2jt 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 ;wzm9 x d a;.nljxq2t a(hx81x20-mH coil and 1.0-mF capacitor for aa1hz nt xa( 9;j.lx;xmd 2x8wq total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitandw 2 rmqsl .uf)t/:gm6ces is needed in series with a 100-W resistor and 15-2)fl s/6wqmg :mtr u.dmH 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 pud ytk.u2nd-a cxulb+ d)f: 7g5t in series with a 450-mH inductor at 5000 Hz for a total impedance of 40:gdaxn uc5l ky2.bu7t-fd + d)000 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 resis ciz9gsbd9 7f9*c*u yytor at 1.0-MHz for a total ig yfzcc s9*9d9*ub yi7mpedance 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 with a 20-mF capacit 1i7ed4sl3hb bgm,mx1b) ipt/or. What is the impedance at 1000 Hzdp)githxl11 b mebim7b,s/ 43?

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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 oq d4y1e 3 hc9vx1 )er1t;eguwa 10-mF capacitor at 1.0 kHz for a total impedance of 45 eg49 )w ;do 1x1hy3r1ceutqveW?

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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 seri/p* fiy mj 6sx4d:s5cjrkm 1,ses with a 10-mF capacitor at 1.0 kHz for a phase s fs:rmpx6jy,5i j4 *mkd 1/csangle of 40∘?

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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 re-lclo j 5+ysqwjq,..msistor at 1.0 kHz for a total impedance of . moqlc+wq jyl5-s. ,j45 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 10 nty1rbi(; p,qdc6eccp1c/;b 0-mF capacitor at 120 Hz. What is the phase angcr;tc6e; dp bi1/1cbc, (ny qple?

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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-mH coil, andxpx y -iu9,i.e+lfu/zc3ayv ; 1.0-mF capacitor are connected in serieclx,v.yuyz3i+ui fa- e/p;9 xs?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuitlt3vq6 jb)-rl 4ooo)i consists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-Vqt3jv loo -)i l)b6or4, 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 30 W,gzzu hug)x0 yz( :q-0o and an inductor of inductzz- yhz qgx)0( g:uo0uive 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 ang.e o1s,4mub qxle for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connectedubq ome4, s.x1 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 necessarg,up 1,l0 dmvdypn7g (z8 akv49 afq/xy in series with a 500-W resistor for a phase angle ofq,,zv(p0dm u8 d9/k4glvagf7nayp1 x 40∘ 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 = 2p 6y bw+ubw;;y0.0 W, L = 200-mH, C = 10.0 mF. At what frequency +wbuw;pb;y6y should the circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power outputfgs.jxqvnju 92,s5a2 in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, ann u ,x.9a v2sjg2jfs5qd 10.0 W capacitive 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 ACwp6dar4790hhz ad6sv15l-bv l bv .ca circuit is 63∘. 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 impeda rbczn;7cz yw:6re ay// f+)q9inev:ince of 60 W and a resistance of 30 W. What is tcrcy/z 6b i:y/naw 7+rq vei;9 :nfz)ehe 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 containing a 50-W re6(pj5c 7 4sru06g7jrx qphqv4w)xn 17 dym gessistor, a 10-mF capacitor, and a 0.45-H inductor, when er06j1s 7p7yx (du7ggpnrs) cm 6jhwx 45qvq4connected 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 frequo4r7 w je.qr8sy(hok q fr*8j *cd3hh:ency of a 1.0-mF capacitor and a 15-mH coil in series?hqoq:k 8 c7 4rwfjh3rrj*s*8 y. ho(ed

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4 peodupsv07,2o4k y/h.7-mF capacitor for a resonant frequenopsy7d pu20 ,k hveo/4cy of 10 kHz?

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本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
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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 fow/h/59vcolt5fb- nf hr a resonant frequency of 1000hn5tb v/9w5fhocl/- f 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 andhr,* ;pzw0tkm a 40-mH coil if the resonant frequency of the circuit is to be 100hwz,0k;p rt *m0 Hz?

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