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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 flux e1 rt6.rtdptnelp-pxz6f5 8 l+xcept

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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 ind sqkdf0abz0- e/5am 0/(:hxhiae -jdzuction 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 of loops of wire in a coil produces what kf:7gn64-ozge xz6 ncjsh j*7rind of change on the induced -rf:7jez 646g ozgnjncx7* sh$emf$, 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 pry-a zj8*-d jchoduces what kind of chang8-dyha zj*-jce on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wirra kwfx bd-;hibxn4a:; -a44ee produces what kind of change on the inducewed h-fk;b:4 - 4n;xaia xba4rd $emf$, 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 magoghv a qfy1g ud25y9rvs 16,ykbpz 54,netic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in d0wipeljs70,+0bab 7 xgxs r3a conductor will be that which tends to produce which ol+3 07abwrxeisx,pb7jgd0 0s f the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A 5s xg4 t1l1tqlbar magnet is held above its center with its north pole pointing down. The stationary magnet 1ls lt54tq1x ginduces (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 horizontals;x63 mypqf2zesid(1 1dwu j: table. A bar magnet is held above its center with its north pole pointing down, and released. As it ap ;x e3s:fi1sd 6d(pwj21zyqumproaches 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 tabl-.*dn 0wcbrige top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above gnwc-*b 0i.dr, 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 the9l-pdd35*rat .zqexz ghj8ak j (-9sp magnetic field vector p(dh.p9 zz qgrjj 39s-lxa5ad*t k8e-points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the 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 2/a so)kh5djutop in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is t )ud52kas ojh/he 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 li1h fwh9qixlv;4: ccv-es on a horizontal table and carries an ever-increasing current northward. Two coils vwlvc 9x4;i-hc1hf q: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 loo8x9tr /k4zowlny +az7 p of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed fot 4 9zwrxa/z nl+87kyrom 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 abu0 hyky5f3+ g1w g8ljqout an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orie10hgq ukj+3gy wfyl58ntation 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 whosem)avj ;b+3k:i2ktv0 xooca26 rxhhs 6 direction can be varied. In a region where a uniform magnetic field points strta sri;m2 j20ov hk)o:h 3v c6xa6+bxkaight 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.u ch-wj;gc:pxs1d:om((q(d b
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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 thmsjaome) 04n ve (u(g1at 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.fwnaino8: 6/aao3 z d7aa oy5; 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 bs ogegd+.b50gze,s/59 v zqhc6 r xm9the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning th9ez5 sm og 0e.,x9v/rqbhggz c6 bs+5de 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 ;tfl 986l+ir .xse 6cvbfen-yrotates 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 transform toor, 7geuoye8 2nj/0s

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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 revolutiot,jx*:r6mev4ris 5 b4m jznd* ns each second. The frequency of tbmv46d x j*tjm,ren*rz5 si:4he $emf$ 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 devfv:nyxi/0 mi+t s f3m0ice 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 de 0.bsu 4vgz6zevice 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 mo zb(*4vhjf4s)sh 5o zere loops than the primary coil then5*zhf e)jhszv4s( o4 b 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 primarid qpty:25a x-y coil contains more loops than the secondary coil then it is axti :5 q-a2dpy

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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 b omd0uy4uk;,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 circu p2 e*, dl.vo:t-zxwxc7 iysn*it,

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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 ku 4(e wbdtc3 cl*z:5bconstant terminal voltage. At the d45cz( 3 eu *:ckblwtbmoment 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 av)y-zcps 8: elre connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the v vez cl8:)syp-oltage 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 inductance9sr-; r1iyt yilnv6s. 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 inductance L and resista5b0 xu fhwborg r69a72nce 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. T3 d0dpq. w*larpi e/o;he time constant fo0e /.arldiq p3dwp; *or 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 connectetgs ;c:f 1lte2d 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 decrease t;seg:2 tfcl1to

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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 epgcy,)ndh gju-s7 4o/vbn/ 5 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 p/ jhkg*kn1n(c ower 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 a(y/c: r r mq4ibbxc8.supply. In this circuit, the currentri. c:xcra8mq(b/4y b

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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-tqr w. o,yyp lfb/+: hhlr*.q changes by what factor when the frequency is t:/- q,yhlyhq wpt obrlr.+.*f ripled?

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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 inductive 1wq bwd,g k/m(1rm-b grg1bk/m1 (g, dqb-wm rweactance 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 approac1hier 8u g8vl+hes zero, the inductive reactance of thaug e i18+l8vhrt 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 connec zv.:zec;a4 l0-kee weted to an AC power supply. In this circuit, the currenw:;v0ekeealcz- e. 4 zt

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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 pir kop+;c *z;circuit changes by what factor when the frequency cpkri*oz ;;p +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 zero7 n eg:dal+ d.o(de l6h(/onfv, the capacitive reactg/eh6 old:(an(7. oflnev+ddance 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 jigszo33zxgm k+ /-tvx/5; lh capacitor in a RLC series circuitlggvxj sk i3ho/+/-xt5zz;3 m ?

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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 defiiz8 11 ybg3l6f:jngmkxymq9*hi 3 e 1tned as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R is *rn7l8jc)hrp.w k7uncreases. Wher 8hnrspkj).* 7 lucw7n 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 inc.:x jguwg 3ps6l ti:q)reases 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 imn0l39embyd 9 dpedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circui 86lpfr f+ht7it, the reson7tfh+f r8i 6lpant frequency 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 appcr(ke2bct 2 c 2/sxa9ul .qq1flied 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 circuit occurs whe l1nbp5jbs ,un 3tm-.fn

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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 r:;ma1uj8zwpg zjc 7q)-rzc -aadius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetpa)w --c8q zu;m1: jarjcg7zzic 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 m is rotating in a uniform magnetic field of 0.20 wov)f 2bjj,lz(sh+y eh-t2:p T. Find the magnetic flux through the loop when the plane of the loop and the magnetic )lj-vh(o fzh, 2:ytesb j+wp2field 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 magnetiyt x4k detub9+,h)92lj/ n3 vqgtw:mqc 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 a3+ n4)k9b thwmty/j: qe gtqd9,2luvxngle 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 areap e wf; d6)82vmwmf;mj of an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes fru +-fgjhs i*4pom $4.0 \times 10^{-5} \; Wb$ 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 w6ly v skcm;59vith sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the l9mcy56s v;vk 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 nalv 4hqd9l9hr0e/e9 s71dxkn.0ixs turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns yshyz; /f 9vd:csj esyy2r:) c*6ki0 iand 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 horizonta u 5c kx(58a(tuffo p*lb4rl1llly at a location where the downward comfob(l u kr l (fculp4x5a85t*1ponent 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 bar that is 2.0 c*/hrxpu-:chzp5-fhe u 0+jim long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while inecpz -cjru 5hx:0*h iu h/-+fp a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-jsyye2tu/3v.bo l7cdb u4 b36sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wiaii1 i4 vao y0jr*5j6lre 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 lyz h)nxw3k5705bk3 r0ba f4dq(xmzu 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 to the axis of rotation, what will be the maximum output voltage of this gene0(bdkn 5hxzlrz wybq a3m 47)5x3fk0 urator?

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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 of wire of arpm+4/: j rbhdt(uhe,rgaj5,rv:ay 7 mea $0.090 \; m^{2}$ 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 wis; mpy1gda zue jd2/j:6h to construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotatmpzg/;d d2j a1u:6je ying 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 a4rhrfb/6.ux1a9vo52e)s z 9 qh lej tv maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor a ,6yb/ y7yfaxyj4d j;operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The mo:m*pgc)4d b8 0fnrievkj h bh,b ;e-7rtor operates on 120 V AC, rh:,vf7*0mjcb e n k)pr8; 4bde-gbihand when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal rese6gjam2bsbeek7c;e-03- oumns c 92 aistance 6.0 W is connected to a 24-V power supply. The operating current is e bes ae9asg2-;u6-cmkm2cbn3 j o0e7 1.0 A. 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 rjo xxcs9.b0g 4) zon*mesistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A .4bz0x ogxo9 n j)mcs*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 resisty3g-sa 9ve;dxa6l 8h xance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed.3asxd- hae l;69xvgy8 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 tn4f4* gb lucae3px -p.o reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn p8; lte xzyp) q4zjan-(rimary of a transformer causes 14 A to flow in the secondaryl8x az t(;4q- )yepjzn. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how k,q :om hba )hgku/y14s/f7gcmany turns are necessary in a 110-V primary if the 24-V secondaghm o:u,qk)/g/hcbk 417 syaf ry 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 primary coilnwis 3ejtix9 t(k/4;v and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primtjs/k nv( 3e94txwi; iary?

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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. Assumgqidyd)w x08r(hf7qc0 u0,fhing 100% efficiency, how many amps at 24 V can flow in the secondary?0 u0),xiqhwfrg 78q 0fd(ych d

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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 signgf *lzvvboh.5q ;5w 1b transformer provides 7500 V at 10.0 mA. The prim zb*b ;55 gvqfl.v1owhary coil 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 otkuske(xm(g9ec)e34(k .k z 91efz qsp ,r: bdn its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the seco p 3x4:m)sfk1( ezdk(q9zceuk9,rbeg se(k t.ndary?

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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 6 ly bz:tl 7wqh/ m)zu;q4uck-;0 turns 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 lw7ch q-bzymuq/:;ukzlt;4) is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has wabtj6cma y) +vd7*w(200 turns. If the in*7dy 6)+tbvwca jm(a wput current at the 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 qs1x-7x 8p9iop.te(q s x-xehtjcq 2( has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we q9cx p(.s821pqs -tjx7x xe- iohq et(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 transe c)u;mwjgee6pge0 (2former has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional ) 0 2pcj;6egmeewg(uelosses)

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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 voltag.g4*mmtxz) /gma uy:8udoz -ie is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary m:zxudu8m/ m)-ig . got*a4y zif 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 wdj lg4mv7kh-l fj+8;lz26du,(kls lcurrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power lgwu -8j6ljllfk2(v 7 dz+;m,sdl4khline 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 ;.+jds)upuht *m zyz. A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if thu.jud. p*z;myt+ h)zse 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 rp7m- ercwjc;xom *2 a1hxq 42line 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss 2wceror x71qhpm a*4jc;2x-mdue 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 used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A0uqeyexj+fg 7j((n* t 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 tje+ e(g*jqtyufn0 (x7urns 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 power would be lbb)9zel4 /ou iost if the powe4e)biu/9 ozlb r were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It w 834-9wolxt*/c qd3 dcfz kbjis to be transmitted on a line with res d3 -l*cwwkq4j z /ot3xcd8f9bistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is st qfwoaql1i0ty 9ds.q6*. rh 0pymi6m1ored in the coil's magne1h 9a60o06ypfl*yd.t1miq srm.w qiqtic 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 indylwekdxy(v-- 30 h sv7uctor. What is this cire-kd xsy0ly3v- (7vwh cuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC5ka mhe2 21wch 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 chga/ +c9ah 6c; nay53fykt5h 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 outleks4kw 4z0,vc,bs1fl w d hgg/7rft77it. What is the resistance of the lamp? gslsfhi4 z7,kt1bcd7k74wgfw /0vr,

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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 thebfo pq2:14ihj peak current thrb2ij4:1o qhf pough the 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 xxa1c*r*10 3e7/- fih mqybclmfel /i ac power supply. What is the power dissiph/maei 7llcb1 rxfm3 q*ei1-xy *cf0/ated 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 resistok2co e0g;yn 0or 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 res;z93 salo zmzov9s -e+istor 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 : +w(p r5klyva50-W resistor 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-mH inductor at 60 Htny0 tq5bg8)l jdrc ;fu:/ k.iz?

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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 reactancqziwt f:bts6ia k +t)vg0op 02 *g6re2e 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 coil have 1 mhq6hr2(+ i7sp(iyza4.0 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 inducd2)mzlrv 9)l xhh xda- x6:*em3 g d9ryjh8n*stive 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 V AC at a fop+6iko 3p ;edrequency of 20 kHz is applii ;p +3pkeod6oed 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-V, 604q1gqabn-g7/m x* lor .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 ocj)twmu914 s lk8zj4 df 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 capac -z- +.obevqupr(t4hu itive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 120/ s)wbt94cya nt; *uwvide8r .0 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 b2rj;8xd 66kud ayr6w capacitor be 100 W?wd 68bduyx;2aj6r6kr

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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 0.001vwxa8 q spb-sd33)be a(;gd .r1/vfar0-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 r diai+7t6md ;12.0 W resistance, 15.0 W inductive reactance, and 10.0 W car ;7td6idi+ma pacitive 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 imp0hi.zhb h, r5 okgic+;edance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitorg.+z5ibr ;ohhik0,ch 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, 20-mH coil, am3- ,9v athbfxnd 1.0-mF capacit9fb3t,m- vh xaor 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 inductor, what is oj y / qqs5( vfm2mxl+.rog7r,the impedance at 1fqyxrrvls7 jm g, +oom2(/5. q000 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 se id** v jhhfz(ssr6skof 7ws/:q i4:b;ries with a 20-mH inductor, what is the phase angvfhb*sj :*s/;zdio(k7 6:q4if hwrssle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circu )rwcp0y tuc(xiu; eo29t cn6.it with a 20-mH coil and 1.0-mF capaciun occy(;xcr )6t.i 92puwt0etor 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 with2xowh yi)unz3y 4vo ,0 a 100-W resistor and 15-mH coil to get a total impedance y04 v2ixohwu3n oz, y)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 sip c 30+qg;e 9yernr0eeries with a 450-mH inductor at 5000 Hz for a total impedancn+9c i;gp ee0rqe3y r0e of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series ws347) z k5l+y tbeblv3 xc+ehiith a 100-kW resistor at 1.0-MHz for a total impedance of 150 k z)xc+53 yil4bves hb3+kel7tW?

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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 cop:ai gcx8b3w 72)f a)mn78q dh/segwvnnected in series with a 20-mF capacitor. What is the impedan8n87qc)/gdfwb2va 7axw i3hp)g sm :ece 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 ntd;tc*; u;ak ozb 1x.eb(nt0d eeded in series with a 10-mF capacitor at 1.0 kHz for a total impedance of 45 da1b;*0tek;xu dn;t b(.otc z 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 capaci2ig1/8nvdupd.ko w9p,e ac: l,yzat 6tor at 1.0 kHz for a phase angle of tva6.algo iy9 ,zu d/ 2:,wcpk8np1 de$40^{\circ}$?

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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 k: . 3cclcn;0j9k fpuewith a 30-W resistor at 1.0 kHz for a total impedan;9jc nk fpc:cu3.kl0ece of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is the ph/ pe*)ervp sn/ase anr) *p /vespn/egle?

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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 ,wk7q l9q/h zoresistor, 20-mH coil, and 1.0-m /79klhzoq qw,F capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consist:3qi* qvgovpd6n. lb1f(.iui s of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in 1b .i *.p qdvn63f giluvi(qo: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 reacta qvmh)ex89(3ao6wg cbnce 30 W, and an inductor of inductive reo mx3wae hb()gq 9vc68actance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W ree dg8bdot idov7h9 d.ru, r/81sistor, a 10-mF capacitor, and a 0.45-H inductor, when connec7,db9uhti erdd 8.v/ 8orod1gted 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 phase( sjpoy3cm 424debi,g angle ofiojc(p,2 4 mb4 3ydseg $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 20;a5l -yxf t95n pu:rko0-mH, C = 10.0 mF. At what frequency should the circuitpoa;-59nkrtylu:5 x f 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 ymrep96re77 uwith 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power su6umep9 7rry e7pply?

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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+/0dcw d +ykpycxo6 1ifh *z39hy ylh2 circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistanc 23yx4 2vz2 as2s cmobro3zra5e of 30 W. What is th223rym2a szvo4xc b so35azr2 e 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 fact17 nd9mvajo ,;ka1qbg /dp(tlor for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected tjpo;d/glkm 1(9d71 ba an vq,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 capacit f1*zrx .sbr n*-giia;i fix1)or and a 15-mH coil in series?fa*f -si.;xg i*)ri br i1z1xn

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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 capacitor for a resonant f2v:fzn(w9ybgb p x.9urequency of 10 kybbx( z unpvg:f2w99.Hz?

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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 inductej1 aum7sr+e haqfl3d v5cw+1cn,) b+or for a resonant frequen lrsm )ed7+3a+b eh11nfjq 5u+ wccva,cy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be p5kc1l 6j9ssh ylaced in series with a 30-W resistor and a 40-mH coil if the resonanty 1ls5sjc9h 6k frequency of the circuit is to be 1000 Hz?

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