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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux exceu7a 8e uiu:aj+tt. o-+faxcy)pt

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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 stah)(kge5fl pox-8 ,kqx tes that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire i og /r/f)oa4c.+s) bfq74w9fgaa rgbxn a coil produces what kind of change on the inducedxsb ca a9 fbf //g4oraqr)gof)4.g +7w $emf$, 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 m m5 69jvhhs:qoun0sf ,agnetic field through a loop of wire produces what kind of change on5:q6 fs, v9hosjhn0 um the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on the ipqu*is(koimckc mx3k8 04.d79b)z up nduced cqdb( xc 9*u3 8km4szmo i7i0kp.uk)p $emf$, 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 fib(i*f;ca)le0 d67e5ocwajq i eld 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 direction of an induced current in a c6vdq8 pioo * :1bo ys(itct)r7onductor will be that which tends to produce which of t(o8i1 :qopt67y )od*tcis bvrhe following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizongvmwvre 4dac:;4 1.xj tal table. A bar magnet is held above its center with its north pole pointi4c1:gm.vw v4x dej;arng 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 isfus agvk.v jmvqo;)m9 /qm 9/ i zp4ev7yd(9t9 held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when v/djoiya;9)gfs t 4vqv9ve/9qzk 7mmvpmu .9(iewed 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 thl4 f2p 8s5 zc nlc63sd*ohnxg(e magnetic field vector points straight up. The magnetic field vanishes suddenly8szg*c2h43c(no s5nlpx d l6f. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where tp0p6;-x s wzwdhe magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed fp0zdx spw ;-w6rom 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 tab5kywvavdi a 41f77ey1 le top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the1ai75dkae471f wy vvy 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 everac8-et x27)s a(cb:oipw wuor3o+* aw-increasing current northward. Tw: 2c)a-rwcwtab(7es8u3 o powxo+* aio coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop2/ ys9adin g*myvt::m of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewen9/* yiavtdmmg2:: sy d 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 about aolg7o 7gpxmmve i/1+vx9 m 81bn axis whose direction can be varied. In a region where a uniform magnetic field points mpgl1g71 oxmi 8v9o7xevb /m+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 rotate9r plxr.t-x- i9xdd wu.+ yzt*d at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points strai. d+rtlurx *yi-x-d9pwzx. t9ght 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.owhlf799z4f)hb(q cvry3uy2
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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 icz mggo2 de2 jjc/t3))4 waci k35id5an $emf$ 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 fie :tctyb8xq :2sdox69 wld. 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 directionjee74 n33cnw-nejh se7u3p0w1 xw av:) is moved northward at constant velocity through a magnetic field that points straight down. Make a caep3:0 3nnew u h7w1-w jesvnej437x 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 rotat6zgu)h ;* bfb1wnhbvkb1i 1a7es at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator tra5vmyj*u .-n qa pd):monsforms

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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 frequenmar k)*48gvnncy of the am)vn48k n*gr$emf$ 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 dr(6fv/ ;2:wyxl t khgsevice 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 d3* lr s,sa;lit . rjba*(qt72*dkpso bevice 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 znzg bus2 (um1i+ wb4-loops than the primary coil then it is mzw4z-(i nub 2 gsb+u1a

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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 primaraye v;1ht-i+u s9q n(fy coil contains more loops than the secondary coil (teu;+yn1a qi f-hs 9vthen 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 i3s. hxp;u2eyubkl+ m0tdw z81 nput

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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 circuit,mu), uo qmcl12pla*e)

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of conmihf jkkxp)g4vw 61 hcc7,a03stant terminal voltage. At the mome)kh 6a3fwxkm jpv7g1hc40, icnt 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 an91-iyt scbi-au 0e f8d ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inducti-f1aei-uc t sby d809or 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 wito we6(.3bhw hq;ha0f jh inductance 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 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 + eeay1z )4bxminductance 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 time vmx ,*z po7 jfbrtf ;5-v2mq6i5xrv0t constant for the cipj 7fm,* xm2-6zvro5;5v vrbf0qtx itrcuit 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 inducto;(q x o;uh10u/yst/js6 m h zvz,*5z:cwpl aqvr are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrh1a c5;,vxzsl/z j 0wt;ump hosz :q6/(*vquyease 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 samlp*;aisr j0 y/e 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.ww ,70hqzuxj4 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 connected3)wj5(1 fe qfqpm d7zgl1fy: ) ecfty* to an AC power supply. In this circuit, the curren51p)7 qyfw)ezd fcj*m fly g:(tq13fe 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 changes by what factor when th3a3rx3 ez yil9g1t d/w4nk hv*e frequency is tripled 1g/439v lx z n3wyrt3dehi*ka?

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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 indus;zzfy,3 .nj-5i zy3f t-iqmfg7 je a8ctive re; jfiyqai7 m53-f -ynstz8 egzf.3,jzactance 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 A 78(qpl vk d/u2 qjszq03ngqndz a7n83C voltage across an inductor approaches zero, the inductiv3 v37 (a0 nsq8/pzn klz nu7qgjqd2dq8e 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 circuit, lfn.hi-rip 65the currelh-ii.6 5pn frnt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what f+sjce 9:b.oaqxtkd.0jo( d gc -i: t2oactor when the frequeoo.+9txtj:-j i (a0cqogd :s2cdekb .ncy 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 approaches zero, the capacg e1p:o(hqtn v i4p9p0itive reacta4q 9o1vihgp(0 ept :pnnce of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and caae *w)cfc0 w z).ljozth6c5gb: vgo79 pacitor in a RLC series circuf)lo :czozc.t)5*gjv7 ecwa690hb wgit?

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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 definqs9v4 mus;r 9iy)1 :aqmg ghb,ed 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 circuit9ceps,lg;0 3fs x bm:p. The impedance of the circuit increases if R increases. When is this st g9 lsmp3xe :p0s,;bcfatement 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 br.2dq6x )uz othe 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 thexz. a0yx ( syd;k2hz5w circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both4yc wloa.vv9qqs8r/ /r/(wmet 0os7 a double in an LRC series circuit, the resonant frequ0oaq7cq esr/mv w.vy wl(or 4t8s9/ a/ency 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 drivewj/7xz 6/oglwu lfx/.bv/k+s 2 djv2 dn by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circlyh 3; y(rbbjuwx/e; i7dj08 b(zks a6uit 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 field oflx 8dc4ip z8i6 0.20 T. Find the magnetic flux through the loop when the pz8lcpxi i8 64dlane 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 m is rotating in a uniform magnetic field of 0 ;p5jpqc- yxdzhy6;3 l8wr l4s.20 T. Find the magnetic f;83sy hcl4x yp6; p5rqlwz-djlux 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 0.10 m is rotating in a uniform z y/kddo8 lb-2magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an ang-z dbodk8l2/ yle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced fr)vu-za :)mk u ib*o6sld8 na6g2cew8mom $1.0 \; m^{2}$ 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 coildgwu ;h)30 e ha 8xrpc*8tziq* changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cm. i2a 7 cg3gk o pcm,*9sr,f0jluA uniform magnetic field is applied perpendicular to the plane of the coil. puacjgs2g* 9il,7o,m ckr 30 f 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 and0;wrggg3ob7 x 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 ando(o;6 tdj k7rq area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location wh. :wny48dof twere the downward component fnot y.4wwd8:of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. 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 bari 6itf+gdi(t* bq ;znk2 52wyf that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fielfyb6 *it2 iktwgnzd+f q ;(5i2d 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 generatorkit35jh9 *jqnwu/7m m has 50 loops 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 turns o;ylb. u/ogxk 5d fd7;suv-1iff 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 lj. z- )cqaiovqa:8p8w oop is 12 cm long and 8 cm wide. The armatur8.c8:apzva -wo )iqj qe rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, 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 consi;;8s px :o)mxbxi. nlists of 100 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 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(i-a g:s tug 5cnv tiza-ua9:4 with an output of 12 V maximum when rotated a59 svtu--a :t (4auc:nzaggiit 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maximum lt pr-)ie,*cl*e ;ml(gi+y jsfvr4;b$emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates on o4yyk 2cbj0.a$120 \; V$ 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 gvp+f e n5p.mo-wqodf u8(w a1;5x zs0motor operates on 120 V AC, and when running at full speed it generaten wv5.(se;opw8 qfodm xf+z -0agu 51ps 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 supply. *f y3gtbk)plahda/uvp .y.uy* )37a bThe operating current is 1.0 A. a3)y.h/.u y 3pkl*da b)p 7uvafgyb t*What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supp iyk5,aw9k0w jly. The operating current is 1.0 A at full speed. What is the ba9akjw05,iy kwck $emf$ 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 1 koe36scio)w supply. The operating current i)6co w3 se1oiks 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 volhnyj/bel;;1q* v1xpvr +qa.a y4 a7vrtage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 pdmpqgd*0nmtue u -ky ;h4790A to flow in the secondary. How many turnsnd*t hpmudqp7uegm00 y 9;4 -k 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 man9a )gux ea6 wo,s*a(hqy turns are necessary in a 110-V primary if the 24-V seconu,*gas) xwoh ea6a9q(dary 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 consis8hxl7z lu1guc-p 4 c(tts of a 500-turn primary coil and a 2000-turn secondary coil. If the cur8huct g-7 lx (l4z1cuprent 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% efr 8d6ae;j ft9sficiency, how many amps at 24 V can flow in the seco rf;8j6ts 9adendary?

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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 transformew);vbas sr/e5 r provides 7500 V at 10.0 mA. The primary coi5;we avssb)/r l operates 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 secon r-c27t,rkfb mdary coil. If 120 V at 2.0 A is applied to the primary, what voltage is pre r,r-m27kcbft sent 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 coijv /p+9wwbi6ol and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secob +/6wpvo 9wjindary?

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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 sqrw z4gfpr8*/- ,offq l+/dl 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the wq+48sr pfz/dr,l /-fl o gqf*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 transformy fd09stqrpn18n i 4dvxpe*65m(h j1x er has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect pm9x 1p(rheyxd4q06j 18*id tvns5 nf 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 transhgx6l,+p qw afaa8e86 vj,0lkenfo59former has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power outppa+hq6llff8g68,ek ea0 ,oj9av wn5 x ut 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 ofpyxec ))ya8w7+v9 sn q current at 120 V. The voltage is usually stepped up to 4500 V by a transformer a8w7vyxy c9eq) + ans)pnd 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 of current at ej2oynd ax-7ros3 r0.,4db js120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in t o, aysjrs40bjo.e- nd2 xd37rhe 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 voltage is ususj 2j4ufz7: x+5rbyje5 to9neally stepped up to 4500 V by a transformer and transmitted r94jej725znxe:+ytj uo 5bsf 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 hd ob8z 1.(b(gg1cteqh 8 fo+a50 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 turns ratio of 100:1. What 8of bboh1 z(q1t 8+e( cag.dghpercentage 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 kalvy aan7iiwt;6 )2/fm long has a total resistance of 0.60 W. A generator produces ay7i aal w/n)26v;i tf100 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 when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less powee+tobx 6yeg6r2k j65y r would be lost if the power were transmitted at 3000 V instead ok66+2 gyyrbj5t xoe6 ef 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 transmitttl14-q ia** wig pxmr0ed on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a traitl 0q*wa r1 igmpx-4*nsformer 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 4r qlpcs:p4,g*,gbhu 5.0 A. How much energy is stored in the coil,pq,s* r 4ggl p:bchu4's 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 a 6.0-W resistor and an 18-H inductoau7g(u sjn9 ;9 d,tbg dih+4cvr. What is this circuit's time constantsu td(b jg,ug7;9ia +n9vh4dc?

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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 volt0jvqxe x2r 59azq1jkei lntj: d-5k 30age in an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is gdxd- 1a, dz)ok7iiv9 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 ofx5p9d y7hrxhy) bol:9b: y-lk the lamrd ly-)b5:yo7 y9hb 9xklpxh :p?

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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 10kg hibzk xe.(o -t9dm uka31,20-V ac power supply. What is the peak current through the rt,g9 o1b0ika em u3h -kz(xkd.esistor?

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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 supply. 54 af4uz6 rc oggpo*y9 What is the power dissipated in theu4c5gf94 ap*zorog6 y 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 resis9 oakia6xdlkr* f(1:ik(ek g7tor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W rnw6j 7op2h uqz1zo14sesistor 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 resist1.knqk+ 4s s3j0gqc4a vtget2or is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-ceh w;b;-hc(ef*1 zcz 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 d(kf4f 3.aeeb2.50-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 wilax7:.kgck2prlq0vv/-2v zf kl a 14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance 9 a*5,oowemk+ f6t cusat 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 kHz ise4 wv0 v*be,w4oa 1jqy appliedw*0vje4 o41v way q,eb 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 110-fzw 6j)9ae*hoV, 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 3)x a xf(vjjiu k/v7p24.7-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 5wfq mx(n 46svneeded 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 capacitork-s/)qn+1c8n ajr nijtr /) hk 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 6mfkly3tg . , 97j+ewmqvs7y xcapacitive reactance of a 0.010-mF capacitor be 100 Wvwf 3x9.,l7ye+ 6y m jtk7mgqs?

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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 thj*sij- ak0 uw8 qz-b3nrough 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 s60fx qa(:gncm u5a8 , bnrrz1geries circuit with 12.0 W resistance, 15.0 W inductive reactance, and 6( cf:na5z10bn mgur ,arqxg8 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, and 1. yirodrzrql2,,xlrj371s: (m 0-mF capacitor are connected in:rrs3 l l1y,zjd rir7(m ,qx2o 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 100az7a7 zm7v-jq-W resistor, 20-mH coil, and 1.0-mF capacmv7zz -a77aqjitor 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 connected in series with a 20-mH ind4r +glg*1t+k .e*atuz6 pfqn luctor, what is the impedan6al rp1+.uk*l *tn g+4f eqzgtce 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 in series with a 20-mH ing 5lfzvd81)sz ductor, what is the phase angle at 1000 8s5zlz1)df g vHz?

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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-mHff(mij p1 ouc .f6l(o6 coil and 1.0-mF capac io((fpfmf .1u oj6c6litor for 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 following capacitances is needed in series with)vwki;xs(,zm a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000vx)mk(,w siz; 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 withd- nupd 7uoo:8 a 450-mH inductor at 5000 Hz for a total impedanceud npuod8 7-o: 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 i9s3aoscq)v h:-puz iv-vu -/on series with a 100-kW resistor at 1.0-MHz for a totaco9o:-q)3- svpvuih azv s u/-l 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 flbx8 l*+t*rm3ep wc-with a 20-mF capacitor. What is the impedap38wf* r+ ctm-e*xl lbnce at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.08 97-bb7 vgvng/v1kd gmuzj,nu ::eez kHz for a total impne:,u9:mb nz/ vgv7uvj1zge d- k8g b7edance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF caq/zm *7z,scu)olmn fj3 k7 y+nii4t*w pacitor at 1.0 kHz for a phase f4zcns3wli nty )*7j/z,m kmqo*ui7+angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHli89 m5nuc/fi8,kr-n a(kg h pz for a total impedanc/-h5(98mfgp ncikalrnu,ik8 e 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 .zif3)6 vhvkqz 4b(ptseries with a 100-mF capacitor at 120 Hz. What is the phase anp3h bzv(if t.vqk6z)4gle?

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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, and 1.g1wa0* l,ywzc0-mF capacitor are connected in serie,zwc0 *a ywg1ls?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0--+; l t5rjbel;oefno7mF capacitor, and a 0.350-H inductor. The circuit is connectfont;l+o7 -5er e;lbj ed 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 - ftr qp9k45dbcapacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in ser- 9f5 trbdq4pkies 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 circuit containing a 5c;8zgotgu , l+0-W resistor, a 10-mF cap+ ogtl 8c;zu,gacitor, 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 phaset hmt*la1c8+ -bbf (yi angle of btayt* l1fc(bi8m+ -h$40^{\circ}$ 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 = ol1qmc8q yp+ 0bqla 9*20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the 0* 1qblaqmc8 poy+ql9 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 output in an ac series circuit with 12.0 Wz.6 0nt acbadq8p n/(n resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when then0za 8p.cntq6 ab(d/n 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 An a e1ml/ a.(zqby:x4gC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. Wh +(yqv,hxvl8lfy; ) 46 hsr3 qrrd5cpfat is the power factor?ry6;q8(c+vfpr3) sy 54hlhxl dqvfr ,

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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 resis j, ao;je7(ad.wdp:gztor, a 10-mF capacitor, and a 0.45-H inductor, when connected7 ;gj(j,wdaae:. zd po to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in saj-n3pq9 e,zyeries?- ynjq, z93aep

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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 vqvkez3h6kw:7 dte4-yibgy; pmy:cr .6 3q,h 4.7-mF capacitor for a resonant frequency oy c 76riyvedqe3;:g6:t-hpz,4y. kk h qv3 mwbf 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 resonant frxu ) rumcm:/byxskek g r)s;9.d- 06mqequency of 1000 x)-9 scg/mkeu )6. qm;xr:k mdsbryu0Hz?

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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 seriel 0vcb ct64s8:yle*ys0n o z*fak;.zps with a 30-W resistor and a 40-mH coil if the resovt lpf *n zy48o*:clas6;ysz0b0.kec nant frequency of the circuit is to be 1000 Hz?

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