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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic fluxujo8ek0 cwg:*7spz-pd-p iq/ 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 that v1 jtc- t/yhg31;wrmfthe 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 ofy5lqjc -ufr ;: loops of wire in a coil produces what kind of change on the qu :cj;-ly5rfinduced 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 o/wkgtxdt7 ( o 4n; i,mbzab4l,tje5y,f wire produces what kind of cha(o, ,, nidt7tw;xelk54 b /ztmg4ybjange 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 bl/ .qx aw6u3fa loop of wire produces what kind of change on the induu3q6.lxwf b /aced 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 field 0r,s7 t5tv5pb v6axujg ana)9n 9xp7van 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 ind 7p6vjr1nd 7aduced current in a conductor will be that which tends to produce which of the following effects?7j7d 1 var6dpn

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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. A5a9bo w e-zx wv913s1spa x0zt bar magnet is held above its cpxze1swaw -s9v 193boxaz5t0enter with its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above iq2srao +.cspe (z9n b qa/,,czts center a( ,qzb/s+ cce2r po zqn.as9,with 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 top in a region where the6.mnqpca nkxi etv(g ,h*(6pukm)i 4 / magnetic field vector points straight up. The magnetic field vanishes suddenly. When /(pq.hk gimecku amtn66pxv*n,(i ) 4viewed 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 where the magnetic fink b ivjwm tz;0uv;)cx1wzz7 b1:ql4. eld vector points straight up. t0cb; 1nmv; 14qu7il:vj.b ) zwx zwkz The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table t9htv4-mlr8 )lq;wyt gop in a region where the magnetic field points strtg q;)lwl9h 8- yr4tvmaight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carrie4m pakxp seo05jkxmq; (-8jn4 s an ever-increasing current northward. Two coils of wire lie flat on the5j4 4xaojn8 mqepkpm x0k- ;s( 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 enter*lhjx)gvcstq, j e:gsj (h3.+ing first. As the north pole enters the wire, the induced current will be (a:tchj sl(q)sh g+x3*,.g j jevs 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 ab5falqvug:*k0w lp7kem7 9e i8out an axis whose direction95ke0 *wlifa8mpleku :7gv 7q 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 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 *fgyc,n/7z g :llhskjc3q um*(dx v13 about an axis whose directicjg,31u*3lzdh/ lx( qm s7: *gcny kvfon 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.+jknw0 6s ik3cd7h q/a
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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 thathned./ix y1bl z;(j -j 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 field. The or/la 0u0s tx0emf 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) ise4qs 9 .omq4eh1kg 1ij moved northward at constage o9jqis41h4. 1mek qnt velocity through a magnetic field that 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 constant an3t z(npdft, gv9eky92gular 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 transfo1v8hks4 6dzzbw:+6sb g stva3c) *l1nzlgi6h rms

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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. The frequesjaz(t 091ryj l 3jidm58fx i9ncy of the 5f rdiz3y a8x90 s9m jl(tij1jemf 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 dea 2-qf5p+tuh mvice 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 th3t jq)9 gv9kt2odj-0 jz)y n -pmwtol9at

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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 secondaq c13s52 v cd+otz8ztkry coil contains more loops than the primary coil thet 2c1d5c3tvkz+ oq sz8n it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil cono5lpc * e6+yaltains more loops than the secondary coil then it is ae6lao*p+y lc5

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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 pozikg ;2f /pe,hwer 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 resona nm-q2 ew g-4v *qzwdgh;c8zw(nt circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery o8b e7q7v 6;ps-4ywxbjsx um *nf constanv- jx *e 6xnbq;sw78my pb7u4st terminal voltage. At the moment 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 conne8rk xlkk)i 0k)cted in series to an ideal battery of constant terminal voltage. At the mk rkklk)ix )80oment 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 ruyc:r 2o 9hi3:-cz bhupw3z;s.gns( jesistance 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 z is/px 6jwq. d/uxd,3 hh83gwinductance L and resistance R is connected to an emf. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same emf, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The,nx2 rqrd.b0zvt+xc; tno r(rx c00:y time constant fo:r,yo+v 0 n tqxz0rb( cx;.c0xr r2dtnr the 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 cond4rqig p rytb 6w1ql 417k x3k(rulu8(nected in series to a battery. The battery is suddenly re r4qyrw6tlk3 7 iu x1dukr8lpgq41((bmoved from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units except:qv./ao 9 xmvg1l3sxf )

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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 1dkzv4i 8 mphzy03qw;y1 yhsum*j-y 7 power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this cvucbn wlbof 7x/3xuebk1 +679 ircuit, the current b+9b 7v3 u7belwf/un xkcxo61

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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 orm3v v6gz;o(8ox.mm when the frequency is triple r 38 m6m.vgov(xo;zomd?

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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 8 . sid3jw w o8.dwln 5fq0ce7qm4d1devoltage across an inductor is doubled, the inductive reacte.d37ewwcfn5qsmw8djl id d 0o 4.1q8ance 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 + ky3eye1x-rs an inductor approaches zero, the inductiv1 se-kxye+3ry e reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this ygg 3c f.dyvp2absvr;0 7y.x/circuit, the currentb;fv aysgx 02.yvy./r73 cgpd

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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 c h h)89kkvbmn:hanges by what factor when the frequen bk8vh k)9mnh:cy 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 volqmqzc x0,ws5)-bef;ctage across a capacitor approaches zero, the capacitive reactance of t z -0sfq;c)5wcexq,mbhat capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of thz.:8 7f;zcwd;dk2nu : j sztcse inductor and capacitor in a RLC series ci .kdz;wz z7dtc:s8:s fn 2cju;rcuit?

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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 defined as-y 3w)sv3 47bjwc ud2lqbtyg+ 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 owkk (2-feh jv3f the circuit increases if R increases. When is this s (2fjkvek-3whtatement 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 circuqg h00itf +t7wit. The impedance of the circuit increases 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 impedance ofzhsh1e 6o-c i1 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 series m1s3kb,l g :tj f2.aggcircuit, the resonant freg bjfk,3t s2 l.:gg1amquency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied volta8py l9wfu)jgpj*s9;0ghg dv, 6o)klr ge. 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 ) ai :pomnd*g ;q05qslwhen

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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 m is rotatjs vf/**+fpjf( ;wme ting in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of thjmf/f*(v sjtew;f *p +e 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 m is rotating in a unz a,uxe.. f)e;pfmcd5iform magnetic field of 0.20 T. Findfe c,ud ;.pza.e xfm)5 the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10k)-9p.tsjh2 za x agx z)2m7hjr2er8d m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loopgxzarrh.x 2 etkd 82pa)jsm7) j zh-92 when the plane of the loop and 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 adjustab)vk+tk3jau9csk9m h6qa) yy 8le single loop is reduced 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 co +6c *nf9uxp;3axvy1ycny 8 jxil changes from 4.0×10−5Wb 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 with qh3v+ kesq7z.f pnym88e 2a/xsides 18 cm. A uniform magnetic field is applied perpendicular to the plane of thv3hqpm/ x+y7nqk8az .e8esf 2e 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 ;pfv n601sl dlsg(l57dhyiq/ ( hdry5area 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 are l 5rpjfv;40kba 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 horizontar *agl 2dhi9k5c,-a etlly at a location where the downward component of the Earth's magrc ehl2kd9*, i5atg-a netic 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 angoka .j /wya 6j84qvk 4yy yh5kyt(n(:vular velocity of 2.0 rad/s about a vertical axis through one of its ends:tya yya 8qwonyvhjykv4/.4k k (j5 6( while in a constant magnetic field 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 ;8ntvpfasw 9*;c8je .qyncp(and 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 consistxvt8qez:clq 45jmyw3 is+z+1 s of 100 turns 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 lo;va91gn 9av8m5 m2bh fdz q/erops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular t ad8b;5gfvz99q12n mh/ amrevo 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 10:f0isv0ct 4jkyb4e hk oye1:. 0 turns 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 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 ge. k ch qohvlek-drs:* vm(t/60nerator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area kvcqk(dme*oh-sr v/t :0. 6hlof 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 generatogkobz l.s:.eonzx 8f50s; vpgcq,q3;r with 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 resistance of 6.00 W. The muw4v(,:u dfdfun4kkr c*j2j(n wj.c6otor 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 moto:hi lgfgo ga0h 0il:29r operates on 120 V AC, and when r0iah9 hgf: g:i0l ogl2unning 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 connected to a 24-V power sx;llrqtu 1g. ,9 zbrme:u- w8nupply. The operating current is 1.0 A. Whnul1r gt-bx,;w .l :9zrmeq8u at is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connecte)d 5d,n0ndo eqd to a 24-V power supply. The operating current is 1.0 A at full speed. Wd5dn)0e,dn oq hat 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 conne59u kaohl pvwya 0 x.0ni2i)g170d:wvl 1gqxfcted to a 24-V power supply. The o7o w yxl x)gqv2hdlnw510 vg 1pi .ki0u0aa:9fperating 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 vof q3 u5zo:6ys +log/56i fhgscltage of 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 causes 14 A to flow in the secoi 8jp7rlrx,1 a,.tgot ndary. How many turns are . otjatr71,gr ,8plxiin 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 idqze,rpg fm/.a4 *v6cf the 24-V secondar6gvceqdz pf. a* /4,mry has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn prixb.u w, ;.iytyr:4 bie(m2pgnmary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, whatt.uibixey2r( w: by,p. ;gmn4 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 prima (7vcaec *3ko-h0nho(hew:pm ry of a transformer. Assuming 100% efficiency, how many aw(e3c h(koh :onv*am- ech07 pmps 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 provides 7500 V at 10.0r7ey6f hi //ib9nm- xf mA. The primary coil operatr n/6mi 97/- yxheiffbes on 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 turns on its s8ac eixv4*xi 4econdary coil. If 120 V at 2.0 A is applied to the primary, what voltage*a8cxvexi i4 4 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 tur fdv:rb4w5 onia3x( 6), c9xroatej.g ns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is pr)i59bo, dj63w e(xva t xg.4c narfor:esent 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 transfo9dkd)7 j 9 5y/ en:)v0rd8chazxktqtw rmer has 100 turns and its secondary has 200 turns. If the input current at t9 yawtjr )7 d):0 5dknc /98dekhqvztxhe primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turnsb9e612q719w,s m lai upensem and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output vol es, swni 9e79 b6e2lma1pumq1tage 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 secorm jq5+ 67a 8rnmc2budndary has 200 turns. If the power input to 6c8daju+5bmrr 7m2q n 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 60 A of currentf7by.e cuc+tw(hc-f)k j2 a 3h at 120 V. The voltage is usually stepped up to 4500 V by a f73)aj ktufb+-c c2h(hyc e.w transformer and transmitted through a power line of 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 bi f ah:.rpp8z1/nor-of current at 120 V. The voltage is usually stepped up to 4500 V by a trans hn.8r ppbzr- :a1i/foformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 Vgk*ofs4a6 al+d bxqb /rto(ogbh+p.g,)( ap: . 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 t(/t,la rh: (gf.xbpab g+o+a)6o b qkpsgod*4he 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 resz*qg e39l c5f32mn zjsistance 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 energy would be lost if the transformer were not u 39jcn gse mql352z*zfsed?

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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. Aw6l/nu9 8- gzj(t:zguv rj (kn generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission lingu-(8/:zr (6nvk 9ulg t njwjze, 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 -t8h+tec*v sjq* jqb 5line at 1000 V. How much less power would be lost if the power wesv b*t c+tq*jq-e8h5j re 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 tr 9u5( pn,fk6h37) bbtqt;z wecwno 9qbansmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with7b39e;9c h(t qb u5 fnzbn6kw)ow,ptq 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 stozh r /q()ed6yvred in the coil's magnetic f)hey(/v6zd q rield?

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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-Wo skr2zn v323r resistor and an 18-H inductor. What is this circuit's332snz vkr ro2 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 thew2 msu/lm.b( g rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is 7qd34v7w*u *cslcwr 4m vs8axthe 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 outle7qtlobi+ .4lqnmqf ef3(d64i p-m 9 czt. What is the resistance of the lamq 4i4qc+ nz9b7 -(eitfmdfml. o3plq 6p?

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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 apytie(iwh8 e;p (t9 9nc power supply. What is the peak current through the resistor?i(;nh9eet i (9 8pywtp

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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 pgh qw c,o hc:6zu0c,k1ower supply. What is the power dissipahzu:w1cqc60 ,g khoc ,ted in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resist/sowh3;s 6v hj wa1r:nor 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- (nwnwl-( 0kp;6h wrpaW resistor 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 tub 9k1so80ie a 50-W resistor 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 inductor ac 3*yn1adg+ e mxiqv .4pc)ow8t 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 r:be7 twon 26e hqf*tz)eactance 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 14oi7eh e94 ur)q 44iqdh.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 1bpupbo -fxw0 -xr4 u20000 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 12kbv p5t y5/xkj9 urxf+h;du750 V AC at a frequency of 20 kHz is aptjvrukkx fp575b;+x dy9u/h5 plied 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 t h)-7yr: zbqwbo 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 ;9) rhou l:5es9e jd,awjrgq0reactance 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 ith7lp6qbw(y*2/ ( jhfz wpot0s needed to have 50 W of capacitive 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 7vcd kz59nc4ecapacitor 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 reactance of a 0.010-mF capacitor bt219uov ;f rrde 100 W frvd;oru1 2t9?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz axe 59rj8-nz vekpra9bnrdxo nr m)1.a42y/ 0dnd 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 ang/u:bok fj3y8c 6ihtvey 1c5) ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capac gcu5 y1yhvoek cj) 3it8/fb6:itive 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 )h nzvs1v+)xqtoj4i3 , and 1.0-mF capacitor are connected in seri)q41osnzx i3vv+t jh )es?

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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 f 2ri 6 hv*mgk 49mkh0*:xxxro100-W resistor, 20-mH coil, and 1.0-mF capacitor xxi 2m* rrx * 46hv0mhokg:9fkare 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 conep9oq)r8d5tntwo o v71yi6im0uz+7h nected in series with a 20-mH inductor, what is the impedance at9ztv6np m )7r7oo0iq58 d1ywhuie ot+ 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mmmt:3h0 8qkt rH inductor, what is the phase angle a8kmm0h rtt3:q t 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 ut;zhb)9 (h+dh5y wh. yw,lfl-mH coil and 1.0-mF capacitor fo(;bw5zu. lhthy l,df y9h+h)wr a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the followingle oi(mseaz6 3d*o;*v capacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impevmis36(e o;ea* ol d*zdance 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 4a:/jctu+sz1p0,l qn 6v+- bfm unh nq550-mH inductor at 5000 Hz for a total impedance 5 zf+lm 6/:qv c,b-pan+uuh1jnsqn0 tof 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 atpo1 k+dj5x (,ydoyiy) 1.0-MHz for a tot1ody,(op)y5dxi jk +yal 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 with a 20-mF capacitor. What -7ue jr6 fgqop.vjfw:106qm r is the impedance at 1000 6of j- wrgq1rjm e7p qu6.:vf0Hz?

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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 capacitor at 1.0 kHz for a tota)x-m(d+n vw pgzvoc8rr p75j*l iw+(7 8p*5xrvg mz)d -n cjporvmpedance 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 +d fdh0klor:/c w ygu7/p*v+ d10-mF capacitor at 1.0 kHz for a phase an y pfkc+ o:+drd7l0*u/d/wvghgle 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 needey/ dfs(8z7f05bku evk d in series with a 30-W resistor at 1.0 kHz for a total impedance of 45 vyb7udf5(zekk08s f/ 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. What is the vrxb2kfy 715ck:826 vyhtptw phase b w2kv 1pxychrtk 2t678 5vy:fangle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows aw)txt :5 pgy8rt 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in srgt:yt )p x58weries?

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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 consiststbv :o7r .lb(7yyj22jrk( zbz of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H (bt 7bj :zyvz7k2(lbyoj2. rrinductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor jq-lxhlz33/5 s, ;y+wp dmkukof capacitive 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 +upz l5 xm /3;dqksj,-kw3lhy 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 fo yqb:p5 /c.)/jx3ozuq +xfrbbr a series RLC circuit containing a 50-W resistor, a 10-cjqubfq3 )x.xyz5 /r bp+:/ obmF capacitor, 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 / ) 0h :pmvjk.mhu s:33dnxibffor a phase angle o:jifhk.um :hdx )s /n3mpbv3 0f 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 = 20.0 Wt444gjna hz mzt1d0-)8wi gv c, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to hav gdzt 4w0v4c)m-i81n 4j tghzae 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 serh0awiib ) b-,6rrm9dries circuit with 12.0 W resistance, 15.0 W inductive reactance, h)iw9r- d,bri ma 0rb6and 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 AC circu- p 63+ew;r/z z.f:zl 3ft/oacbpfaxkit 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 impedancdu-79ug fp hio e.obh8d. 4uw/e of 60 W and a resistance of 30 W. What is the power f./.u gdh u-p fhoi948 ewobd7uactor?

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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 as, nse(ll-ze9whca5sb :d9 )d 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a ssle(,5hwdd ns- la)cz:e9b 960-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 31uow.; avgn x k pqc4g(thx38of a 1.0-mF capacitor and a 15-mH coil in series?p31x.wgagu t vh38okq4;nx( c

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capy)+dw y2/( s xdpopi(bacitor for a resonant frequency/dydp x+2bysopwi (() of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resona1:w wi zv79u mv6ygkg)ft1ec9nt frequency of 100vgv7z6e f1 yw k: tg9um)91cwi0 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 plozx k994nptn *ba3 h.yaced in series with a 30-W resistor and a 40-mH coil ifyk4nno3bzx *ph.99 t a the resonant frequency of the circuit is to be 1000 Hz?

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