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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 un:,al: bvvv9jzits of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that th(o w,p8r* gadee $emf$ 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 w: h134z(. hdy /jpqdcxe k.ftpire in a coil produces what kind of change on the induy ph zk d3ted..:1/(qfphxjc4ced $emf$, 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 wirvjm 77ikvvg)ab 2c1- z:5ri are produces what kind of change on ic 7bv-:)1z5jg 2rvaiv ra7km 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 o fg4)ex,3 ,v)xq awyipf a loop of wire produces what kind of change on the induca) ey x4)pf, wg3ivx,qed $emf$, 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 magne:su .gw1wxni 5tic 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 +(82bnkrs 1luxfo7 g a- fd e46qowr)llaw, the direction of an induced current in a conductor will be that which tends to produce which of the following 47r18rslaf n xd)u(eo6g-b2o +kl qwfeffects?

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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 .fi4ydwv++q1pu7q(z; zqvu yw z:j5kflat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed fryuzwwpi;5 v.z: vf z++jqdy1u (qk4q7 om 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 ;. b *h1fwlus)tvf *bbits center with its north pole pointing down, and released. As it approachesfb 1f.bvb*us;h* w)t l 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 tabl2jy7bgi)8 ju+ eh pyc3e top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this co b ie3uy2gpcjj7) h+y8il 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 w+ticu0ea ,6f yhere the magnetic field vector points straight up. The magnetic field suddenly grows ec+6u0ya, tfistronger. 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 top f,,9bob gpyt.x;lk3 3ph se )sin a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the,fps gx3;bbtk3 ,s.hoye9 p)l 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 ossllqis )l::) n a horizontal table and carries an ever-increasing current northward. Two co:iqss))l:ll sils 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 loop of wire srd-.gvgz/:r dt7 t.,q kqg-lwith the north pole entering first. As the north po:t.vdq-g g 7s/k .-lzdtgr, qrle enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constandgjqu;w -a 8vop2bg79x10mm2wsys0 q t angular speed about an axis whose direction can be varied. In a region w9 s7mm81ag0pbqg;- xwqs w2d2ojuvy 0here 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 consayl ,i(q / 6:wc:0kdd)va 9 lloh*izqztant angular speed about an axis whose directio l:z wd,kiv h(zac:6iq/laqld)o9 *0yn 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.wg kh(*9s.tov
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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 an 2lv, c/ +*rk)wzwd4p g(t wdmm$emf$ 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 magnetickrp6/5fwffe 1 field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved v/(i 3p365iqpi 8rjili p8 kpwnorthward at constant velocity through a p 3 vp5wqiji(kr/ii 3li68p8pmagnetic 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 angular7c jp5 ogl g4wvczi16: 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 transfor1fl8jj4s n l:jzx;y 5rms

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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 fe *qgaex5fm5-4lsm (mrequency of the e-q g4a(*5l5xemfmsm $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device usedcjc:a9qk3t :p .9l; 4 praochs 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 ufk;euzjdi+ - lf y0(+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 second75:g tl f,+bsxl7xqspary coil contains more loops than the primary coil t7qs s7p:5xlbl, g+xfthen 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 contains more loops than thv cfe1;0u42 d0erw bvue secondary coil then1wuv f e0ur0;ev2 cbd4 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 input1p:7icotoedc ib /0d7

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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 circur88gw, fp/ 6.f, hom vjkq8tkg.0gpq uit,

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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 constah /s /gh7h2wovc(j +amnt termiwg hocjs7(/ h+h2m/a vnal 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 connected in z0 0m49tq o(l5xbsh1ypx) ndlseries to an ideal battery of constant terminal xltn9 510)m(ho pzl4d 0sxyqbvoltage. At the moment 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 resistance R is connected to kib2pejcd, t.nn8t7*:fy6m ran $emf$. 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 n,q/zd u 0wfe te2:o/kL 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 const i( w p)qxt(fq,ix*km ih/9q5gant for the circuit represents the time required for the currentk),5wqitq i/x hp(m(*9qfgx i 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 conneci,2,2 2mizlwz ciwvs5qnx3m 6ted in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the z,vms23qmi6 c2iw2nx5l w ,iztime 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 ep* c -;e.lmh+a corss8xcept:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On thismp. k -h sd v,m3a/w4r*ecs ;n4qvca;f 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 thi,znpp d9po9(ps yk2 ;zs circuit, the current kpsodp,z 2 ypp9n(9;z

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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 w kqixcn30m:t w : 9vap;h87i-lb7tm)xw. ozkt hat factor when the frequency is tripled?o.:x-tptlimc0;v k7 a 7bq 39w xw:)kmn 8ihtz

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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 voltagb5qf vl oa e;9w+f,hnw( 3iwg.e across an inductor is doubled, the inductive reactance of thagfw w;(5 +faw, qnvh9i boel.3t inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, the indup/sivxw jy-8 11b6c cfctive reactance of that cox jp1-1s8 c ifv6/wbcyil

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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. cvx k,.ycohge,r*g2c, xs:5 q In this circuit, the currenhkg,2 q, 5scxcoy ,e*g.v :xcrt

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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 eh4ay bgd 0uvxl6(o 2)by what factor when the freque0v xu6dl)oyag(e bh24ncy 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 /z d 0 4ni2en39nyujlwvoltage across a capacitor approaches zero, the capacitive re9uin d z 34/l0ye2nnwjactance 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 bethq6moa; rdu36ent-u* ween the voltages of the inductor and capacitor in a RLC se3thaq; u6e-rmnou d6*ries circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined ay-zz0 ) tb*bjz0 eun4hs $\cos M = R/Z$, 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 ofw v)fs8krkueusce* g60(r4b6 the circuit increases if R increases. When is this statem8ruke*ug4s0(wv6bc ) fes r6kent 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 increaqh .5(q/w ; mgg;dgktqses 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 impedan5d*5yu( ;zqxm,w :rmih.j lgq ce 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 xy6 v*ea4qbd8the capacitance both double in an LRC series circuit, the resonant frequency of that circuit wil*yv x6d48bqa el

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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 d)rcrm a1-c;f jx k;4kiriven 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 series0k wv l8;6e/) dgcvcuz RLC circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotuu1om 5qkqhb 4p.lf3 *ating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the m.um5q kq4olhb3up1 f* agnetic 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 a( bk8kpn :*camagnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vecb*k(cnka:8p ator 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 magnetic field of 0ars9x5 5b9mx 1ic lana :.kxg:.20 T. Find sxm5a gx:b5ac ak1 9x.:ir9 lnthe magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced +1u xygm/g+ks 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, nugcr7**gr h 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 wifmk4 6:y1 6rzwbm t5vjth 200 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes unifor wm614m56z:jt ykbfv rmly 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 vgx2y7g n qtqgd,5z0-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 andbvubf ;v1*,1put lph2c3q k4y 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 horizontallyc13:x rpvmdfia wid4 6; )o9qw at a location where the downward component of the Eida ;6iwm3)qrv4 9 xfow pc1d:arth'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 m long rogfa2*owr uono2. 0i+)b)dk5vcczd 7ytates at a constant angular velocity of 2.0 rad/s about a vertical axdgkz* wcyoru7c)b 2o5.id f0o)v+ n 2ais through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-zidk-8m6jtia*b,p r ) 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 of wik i 6;,abdx5i-vm-4 *rtymnsrre 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 rectat5(vau9dm(aa( mp rj+ngular loops 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 pdu av m+(a5(t(rjm9ato the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 lvc wvntq6u 6*po ;f4: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 constry6,j * w)c lwx gvs-x(ki/gea;uct a simple AC generator with an output of 12 V maximum when rotated at 60 l,k/e;x-vcggs x)6*(wyj wa iHz. 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 t.xinl)8m hi8lh. nq+ 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 motorb7.c01 -*0 peezzuj ff9))tv zejeguh 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 hac/dx1p eoo)s:,. bjfrgd 4(zeve a resistance of 6.00 W. The motor operates on 120 V AC, and when running .jz eedo )(foc 4d:rb ,sx/p1gat 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 6blx m5lt z(l33.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up cumxl zlbl(335t rrent?

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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 t+ v1nqt2v5dhwp1 ,ac 6pf8g-1pf udco o a 24-V power supply. The operating current is 1.0 A at full speed. What is thehgn,61+ w5pu8pqo1-dvdc vpa2c f 1ft 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 connecteyfa)8c 5 hf/mauv .bx1d to a 24-V power supply. The operating current isuby5)/1xh8.afv f mc a 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 nv- t cgp4qyp/4eeded to 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 primary of a transfonaeuf-40 c0(hn5zvpsrmer causes 14 A to flow in the secondary. How many turns5z npefa004-(ush cvn are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a (kar21; 4. sxaxkludl110-V primary if the 24-V secondar(sl4 au xk1x2.alkd ;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 cuymax+;qz 9 )k) oz1-xgsl,xof a 500-turn primary coil and a 2000-turn secondary coil.)ugxxqczakm+- 1) ;,9z oyxsl If the current 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 10t6xzg6xy0tc++upzii ze) 1e1 0% efficiency, how many amps at 24 V can flow in the )1zzig660uett xxc+yez i+p 1secondary?

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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 neoniyb)hx zy no2d vv)61 f-z*t8r sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does thd*yr)yzo xv62v8zb-n1itfh ) e 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 prim+ fedhaq ar1y4f3/m 2qary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applieda+q1 ey3 fdrf2/4hqm a to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turrfou 5ka3mp3n*1q4ans9 l1msgc ; +e jns on its secondary coil. If 120 ou5mf1lk3cp9msan 1q *; 3a+n4j resgV at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tud3)j3. bebxd60e3ju wmrj0me rns. If the input current at the primary is 100 A, we can expect the output curr)b333d ue.jj6md wrbee 0 mxj0ent 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 turns and itvas80cn52o;: u :q kkz+yznly s secondary has 200 turns. If the input voltage to the primary is cnk lsy:z0oz25;8u yvn+a :kq 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 1, 5c;pgp f/kbj00 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 frikgjp/f p5; cb,ctional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current a+s. iyq u3xmf fn6pucg/)7 ki;t 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 theg ip.fyq 6/mnks7u i3;f +)cxu 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 120 V. The voltage is usually steppf9dh5s(v ph(i ed 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 d h(5iph9 vsf(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 Vj)e7sbl7dh gw 4k4 vl(k/+h*mftzzp7. 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 lostll74v7d)/ek+(f t phk4 zs7w mjb*gzh in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A ge6 8p lzo7 jfqaiweb*;6nerator producesi p; wj6bfze7aq 8o6*l 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 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 ck r/e/v mum6)qb/fh4l5lsv4 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 is lost when the f//musb 64llqhev) v5/ rmkc4 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 10ke3n.xt uc:ulrc61f(00 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 100c1ruelcn.:3 f(kux6t 0 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 tuwgh-slh-i ra6p: q:: o be transmitted on a line with resistance of 0.60 W. 6ups r::-hwa:hi-qlg 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 z*fw( xmd*kb4 0ocrk2much energy is stored in the coil's magnetic firkkc**boz4 (xm fw02 deld?

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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 in4x7/ ov i6z(mbv3suvzductor. What is this circui4 (zvumoi3xvv zsb76/t'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 inug(5n c1lxdw * 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 thepmf2p-hw f+f1 ,z xvv) 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 resistanb u4 .zlr0y5lsce of the lampl blzr5 0y.u4s?

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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 suppl0neste5h gtix.4 -x;yy. What is the peak current 4g e eyst0.h-5;xtixnthrough 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 ac power supply. What is the pf, r x-;ngk+my.bqjmixvo- ; t-ym36eower dissipated in the ree+o 6,-x;txqv; mjm bfginmyr.--3 yk sistor?

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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 r4ct7b +:hes tq4xt0nresistor 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-Ws)x 9uiqv7c :s2.,x0 po1xm k n,qerunq7h,yr resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resisuv) h5r h1/rndtor 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 i1sz)bvu8tn 79 foaao0nductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1000 Hzf8;trl 68rugz b7(bs k?

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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 1 rmoe. 9 du3he+2zv(df4.0-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 fpxsr794) *5)k gewqz gak/aqu cae/2l+4a arfor 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH induc w+gz75lbe92 t7wlpt- wxmje:tor when 120 V AC at a frequency of 20 kHz is applied to it?pm bjwt7weewt:gx7+z 5 -9l2 l

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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 onl-kv dd:w+az* q/tc.bs 9 .ka 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive re l *kgnds-*xetis btl:p.:;d2actance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed tolhz07u/*7lu-vfqw)xnw ,h tm 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 capacitor have a react5x+l q /zzkv9vance 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 capacitivjvn xdihyw2 s59b 6.q:e reactance of a 0.010-mF capacitor be 100 W.x5jdq9wvs :i 26hbn y?

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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.dtk+egnel- xmd3 )to+c,m x*8kto bg u3. t2l-0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 Winny2 koo9 f -te:;,ob lv9yn* resistance, 15.0 W inductiionol;9 f*teyb- ,v2kn n: y9ove reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH c+ov:r mwexq wt/ 0t58ioil, and 1.0-mF capa qt0+v8t:i wwrmx/5oe citor 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-Wv /6xbre 0ru1i resistor, 20-mH coil, and 1.0-mF capacitor are connectedu 6i ve1x0rr/b 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, wha id. a npi*oz06::vbp8 cs2nwyt is the impedance 0 p:dczy6o2w.:pi n*n sia8vb 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 inductor, what is x*m+d--gfqz nj5cgi .;k f pr9the phase angle at 1-jf9rmf d*p;gn iz-cx5+kg . q000 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 needeb hjv wt6c5aq( +hwj9 h0m.wi.d in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at(vwj.0 waw5 jhhc+.i9thq6m b 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 see ti(sp pm;u+vjd fn/h3y+(k5ries with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 20+35p+ts ;h /ne v(juikfy(pm d00 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 f2/h /jtkx z8b450-mH inductor at 5000 Hz for a total impedance of 40000 W/zh x8 /tjfkb2?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must8vtkt /1z6 ioq7gby a/ be put in series with a 100-kW resistor at 1.0-MHz for a total impedaybq z/it t76ka/v o1g8nce 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 jxm /yh:04 bo1 fodkrdday5 +vuh-7d:a 20-mF capacitor. What is the impedance at 1000 Hz?o105:o adv+rk4 - jbyxmh/d7:y ddhuf

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needeqnw a.x5 2,bpl(y)r mkd in series with a 10-mF capacitor at 1.0 kHz for a totallk )n5y,mw a qxp2b(r. impedance 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 capacitor at 1.0nfhqb v3d1 fpe/ -:hg, kHz for a phase angle ofdf,v nbhe -:3 1ghqf/p $40^{\circ}$?

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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 int( j* /iqit a13n dim)lmga0(y series with a 30-W resistor at 1.0 kHz for a total impedamn( tjii iaq)gd/ m10lay(3t* nce 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 witvje7mw): ca(upyy/g; h 4 6rgevoe u1:h a 100-mF capacitor at 120 Hz. What is the phase aj uvmpw/u) 47r :ogg1ce6eey:hv; ya(ngle?

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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 Hqa zk.g0d/en m7w(jd5z if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in se7ke05dgmd.wa /n (jq zries?

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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 rebb) z; ; +echtj(rqvt1ona9v:0simo*sistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. v1 jm h:teo(qbt;90+nz *;bcr os)iav What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capac5*tkv o6b 745kumic etitive reactance 30 W, and an inductor of inductive b7 6*umio5 5tkv4etk creactance 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 serie ilrhhlc-m61 9; )gseqs RLC circuit containing a 50-W resistor, a 10-mF capacitor, asg;h 196lqc) irm -elhnd 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 mx/d (477f n-qjmh x0d.afesja 500-W resistor for a phase angle of (0fj/xna7-m edfxm 4h q.7sdj$40^{\circ}$ 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 = 200-mH, C = 10.0 mF. At what .fl3wv9yhrvu08 ) om ,6wltnxfrequency should the circuit be driven in order to have maximum power transferred fromw.m,tnr63l hu wf8 yvl v0)9xo 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 circu 6bwj(ibp6v 1rit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reacta6v1jpb bi6 wr(nce, 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 cir*yro/ :m3jt0 ,yfoy iiuit l)7 hr.iu,cuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. What b6, xnnda/4 kjn y2y6; fyn.rnis the power factor;ybnnx4 y,/akjn6 nr d.fn y26?

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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 containan 8rym9t6 ro;q8vodv/*i :9z ntm1buing a 50-W resistor, a 10-mF capa ot :ya9t;rvn8zom81 bmurv9*i qd6/ncitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacit3fk h6o8ch0xh or and a 15-mH coil in series?hc0fhoh368x k

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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 mg)9;c8-yvc6+dg;su w laroe for a resonant frequeno y; u-cvlm 8+c6; 9)wsgrdgeacy 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 ind)e 9;kke3tea (ub5hz ug: xtv-uctor for a resonant frequency ofu ;:k-k xz5bae3hevg9t)tu (e 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 place i-2 s,r3yn teymmpl1*d in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 Hz , pt-smy1lem3nr2y*i ?

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