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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 80，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://51fly.win/test80.html  教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。
 作者: physics    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 uniunz.5hq/ 9f -kd(wlry)iiu )5a(tgmsts 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 il ,ox0otcn+z /+g ,oothe $emf$ 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 wha 6 4 4uygok+hdio*l2kjt kind of change on the ih+ 4ld ou g4jk6yo*ki2nduced $emf$, 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 v6ixn6kz. x q-of wire produces what kind of chx 6xi6z.n-kvqange 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 wire produces what k6 a.iq3d7 sqgr4f-dkwind of change on the indugw6a3dfq .rks 7q-4 diced $emf$, 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 magneticj6lwmsm0ry)v qta9d *gz32 k5 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,+e lap5 ozhk;4 the direction of an induced current in a conductor will be that which tends to produce which of the following effects?5za h+e; plko4

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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 i j*u9zo7;qel7 ;0uwz ilq-pwhorizontal table. A bar magnet is held above its center with its north pole pointing d 9i;7j7 0-zuwquo;lzelqw ip*own. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abw 5a1wyw 6bocr8:ct 2nove its center with its north pole pointing down, and releas1w6r:c2wto 8y n bacw5ed. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a gud 6u, h-z*lwtable 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 inul6wh- d*uzg ,duced 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 regsa85r7 op6:37uo*cwhmte ywfion where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this cw:y658p 7hroe 3ua7so t fw*mcoil 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 in a region where the mq r6k;1b4rzlfg(prjwmjomr.;p n w0u. fl;99agnetic field points straight down. The magnetic field disappears suddenly. When viewed from above,w(9u;blr pmqwr6. rkpr o 0.9f l1jzmnjg;4f; what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increas1. oqmw zv;ov+31l cgiing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the o3lgv+ qvciw .; o1m1zinduced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole enter8ol* jhm.msi ,ing first. As the north pole enter .,mlij ms*8ohs the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis who gyg(yrb e4r z872(ahgse direction can be varied. In a regiob(2ge8yar 4 grhz 7gy(n where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whos:h*7( wph5vmjt h0kate direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orien7:0wtjp hk(*hmt hav5tation 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.nxn:i,b7f72 l) w qimkhom78x6ik hq7
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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 an1l lx:l c;nbn; ri8rt(nnu xr/etw ,)5 $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. The p v(g 2o rn ykztf0+eb5//u: qq2gn9ws$emf$ 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 movedvv5zyhf +prc28z3 2qy northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potenfp z vr2+25zvcyyh38 qtial 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 ro3 8:xg0ehdn)v5wx sfctates 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 transs(3bi +.avb efforms

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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 revolutgn/ja*s(ak/,p4 r2 crgl6.e . fpiox mions each second. The frequency of the ki(sl/ag er.6c f*p2no/,gjp mxr. a4$emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used tov6lal3kt j9 (6qod3p b

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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 dv 1ontgd,)4je evice 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 loops than the prihc.e- rlaua 4u,aw(u0/ zpojx/ +f-vsmary coil then it is /aauxvz u-p4- ( ewju ,aocr. /0fshl+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 the secolp y:*rcow(9qox8 j v5ndary coiv: 8pqjy5olw(9xc*or l then 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 powere :jz i(yv,6oa 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 c law*u4/sfin 9k px5.gircuit,

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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 con2 u1i/z smo5qlstant terminal voltage. At the moment contact is made with the battery, the voltage across the remio q25uzl1 /ssistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of constad ( pymu/7pd*bnt ter*my(udb7/ dpp minal voltage. 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 ideo:kn5 5 5w9yrwhz8ss 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 resistance R is connected :5wh y * kabatu5p;s-ito 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 ar o1aawc6j+d+ / zgzo:je connected in series to a battery. The time constant for the circuit represen +:6agdzo oczjw 1+j/ats 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 connected in series to a battery. The bad c, kh56n2 ebycra*i*ttery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrecyc2e6rbk,*in a hd5*ase to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units except:m3 c guu,8 wpxt 7kgir*6no8/f

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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 supplyjf)k*)ssrj6fw*z 6nnwddso 5. . v8pe. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the curre5r w -8psrpnb;b,4utzn4 -nzrtu,8s rw5pbpb;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 circu-2itxttrw +y0 u viulb25v:i) it changes by what factor when the frequency is)y-xt0t i+l2u i2rbwuv i5:vt tripled?

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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 vogc vt;f6 hg42hkcie9)ltage across an inductor is doubled, the inductive reactance of thatkith e42;hg vcg9fc )6 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 kg 78 ho).jbc/x0z vckn ct -8jxqj(/gzero, the inductive reactance of tjj n xch.c c-b)gz8v/(t70qx/8oj kkghat 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 con h+t mb-jwqgm .7+8hbhnected to an AC power supply. In this circuit, the currenmq+hbmw8+ .7tj b gh-ht

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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 factor when the frequc j,vs; jv :pi-y1yh34p6rvw uency is y,hi ; yuj4:jpv1w6p3sc - vvrtripled?

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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 appcidb9 /p5s/ry roaches zero, the capacitive reactance of that ca/dc ry9/ipb5spacitor

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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 4v(r1r)c3 ibs/vi+wdxtb)p i 8) b zpk,iiy ,aof the inductor and capacitor in a RLC series circui 8(isb iickiy3)/) p4bpa+zwv xvdi,,1tbr)r t?

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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 uoh3(w 9wqd nl8 *n/t0v, h rkj+2giakas $\cos M = R/Z$, 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 increaseg7s3m) qm4kx um cs3w2s. When i 2w 3ums43kxs7)mcmgq s 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 impev4 reodxmu: vu1eyf / +nmf1a o-,z9l+dance of the 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 circf216qg8 2waf 19t qgvejz id3iuit. The impedance 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 *t :qt z;gn:v))qs bkoeh:aa .LRC series circuit, the resonant frequ qa:sza:tob eg.;htq)) v :kn*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 driven by an AC applied voltage. At resoxmy2o., p5b 8 nv69 sk3ytugfanance,

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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 whvh 0wn6a3qpiqj dh7q9k8(/ )jfaz l0q en

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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 ue :t+,p,s pxmnniform magnetic field of 0.20 T. Find the magnetic flux smx+ ,tnpp, e: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.kkj*7e vxdq 2(20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fi dv2kk(qjx7* eeld 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 unifor,ri 6)fv;vt -qz,a 8 j0meyacrm magnetic field of 0.20 T. Find the magnetic flux through the loop when th; tv -ai8 jar,zmrq,f6ecy0v)e 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 a84ygc5m xszfn( rs trjq)n30h wk0;s2efu,d0rea 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 changl :ndw uuy/i i2td6w )sf55jl*es 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 v84ce db2elok 8(h*ho on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. eo 8 hlvc dbheo24*8k( 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 turnsmz a39n6aql t9u 8ao:a 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 /yqzpj:mt 2a;and 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 x )*p6cy +d0n +siurxgspan of 60 m flies horizontally at a location where the do d) 0+6*gyurx+nx cpsiwnward component 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 m long rotates at a constant angular velo i /hi4 pd m2m0eg wu l2sbfqg-.h8f9vv9x0rv+city of 2.0 rad/s about a vertical axis through one of its ends while in a constant magn/8ug29f+ 0ixs9mv lv-wd. vh f4qi e02grpbhmetic 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 crmea , caxng+7b0z0eo6oss-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 ttm,ompd 68kdv xb7;+f*( mmyof 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 $emf$.

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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 lo,1b7b gqxv*dhop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. 1hqbd7* bvxg,If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wir7eq uw;fi d.lei6.ss nab4/,gy/xu:ae 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 Apkf 9c(7( wgqvf7 ct wt:hz.xudw)a02 C generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the afcwx)da(0vcz7qu.9 7 (:t2hw fg twpkrea 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 max 0vcy+rmpjdbc) dtj cmn+ nqs1l4 4/(,imum $emf$ 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 motorn(47sf pks2;qwol. ug have a resistance of 6.00 W. The motor 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.+ht k7g5zehc900 W. The motor operates on 120 V AC, and when running at full speed it e7h9g5z+ hkct generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V plxe izh/ 18pal4mmx(0f(os y(ower supply. The operat(1( a0xmpilheo/l zf8(y 4xsming current is 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 resistance 6.0 W is connected to 2 cjie*) vb 5pmx5b.ira 24-V power supply. The operating current is 1.vmeci5 )j2b 5bxrpi*.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal 8..- yx ovffe+j+ez/1 cncys bresistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 Axo+ne+c by f8/sf. 1j-ze. cyv 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 primksb8bj6 :wiu p .a7/pt2.rdczary 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 transformer causes 14 A to flow in theoz(wzec w0 ne -s 13nl,r8)1kggp4ple secondary. How e zw p-e(pl3lo8gk0s)e1g4z w,c 1nrn 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 maoulwbpiyam rx313*j u-2 :5d any turns are necessary in a 110-V primary if the 24-V secondary has - rx1om2 bi*yd3j5:ap3wul ua100 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 primar-a7j9 +t dk4nfxxc+sef 5h3 tty coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in n95 s3tex- fkd+ t7x4 +fhcajtthe 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 tlnhd 2(,ql /zehe primary of a transformer. Assuming 100% efficiency, how many amps at 24 V canzh,e2n l /q(ld flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil ofvp l 5in7v3m 1mo0h4gm6fh2jq)z(l ox a neon sign transformer provides 7500 V at 10.0 mA. The primamoj 5zg(f17 i hmohx3qvp0vmn2)l4l 6 ry 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 w:;s,*28qbjkp /adqcldf h8u turns on its primary coil and 300 turns on its secondary 2k;lsj*cq8 ,ubdhwpfq8:d/a coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its p2g+ j,adt4fj primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what cjg d,fpa4j 2+turrent 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 20r1+ (bogkdsp16 nu4x**/ s;wj fx ejmy0 turns. If the i1j*pgy* orkx;6jb +(xms/ e w ns1uf4dnput 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 has 100 turns and its secondary has8d.hn ii 4uv(obxq2 vq0i 6,os 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the0dqiquh4vi(vo8 . x,s2n i6ob secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 th k3g scg7n)a5urns. If the power input to the primary is 100 W, we can expect the power output of the secondarngch)7ka5s3 g y to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of curjd*9 fuqxz1z 0rent 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 number of turns in the seco9fj1z u0dx*zqndary 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 12tyq / yfj0ny7je5ef7mz/ n ,i10 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 transmissionjm/y/,7y0jnf1 q5 yte7nezfi 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 i d;p2gb7*ue8*0feyhh6afax8io+kh ms usually stepped up to 4500 V by a transformer and transmitted through a power lihde8f;h+ g7x pbyeuam0hfi86* k2*oane of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. g(* *e+tfinazh4jo x. 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 it*.nhj*axg(4oz+fe 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. A geliu3wta. q, xo9qr*2vva . nr/nerator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the volrqxu.,o r3*i. l v vaq/9nt2awtage 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(hbd e3wuf 4r o /)vqpj7(sop,-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 j qb u)w3ps/(fh d7ep(r ov4,oV instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a linel95; bc,kh0abo gn jq4 with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer i90c;nj b hloba5gk ,q4f 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 +yf c(.fz:fi 4m0 cki3g2plp kA. How much energy is stored in the coil'(i.zpff:0 +c3lmy4ckkpg 2fi 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 inductor. Wh* 6b2g;t ylk -eyitx5vat is this circuit's time constagt;y v6y2k*lt e-5ibxnt?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage ist+w*wq fvc)a9o2;v 1orh 9ukd 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 oy) pcd1spa xd(.9 ud8vutlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed intob w/ 20wo)g1o9 ,pugj:gsgf cj a 120-V AC outlet. What is the resistance of the lamgg9j/o2wobw 1:g)g 0c,pjufsp?

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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 supplq) p65/p+qm 0fpgqv shhf 99ixy. What is the peak current through the resistom 0p v95hxgp) fiq/qfphq9 +6sr?

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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 connh 6+e.j,fup hr*ao2kxected to a 120-V ac power supply. What is the power dissipated in the resisto*,huax.ofh +2k6r epj r?

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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 resistorhbssahtjkbkt 2k;ezx34 /+ t:2 m1w/b 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 50prx ixy, )t/p)5n4h:vf ganj) -W 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 resisto akxzj+ 0fr;8adtr;k) upc3n 9q9.wzfqua4y;r 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 Hzo3rjl3-pp kw: ?

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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 reac2an :b 0p;/ y6 t/ agjexz5yfp,pn8kbotance 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 14.0mr5 q6semta+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 nece8fh4:u gt(5 -nalno 1l6+klg smacv+ dssary for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a )d ba5jc+bfu)k(bz m- frequency of 20 kHz is applied to it)bu+)5db m -cfkjazb (?

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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 at zdva03; ane:pgt/b; 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 reactance of a 4.7-mF capacitor at 10 kHz?1e* i t9f)3hg)m(df dmo *g1aabscv k.

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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 o:v. rd)67g0)d7vmotc kierm1kh )i scapacitive 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 * hgr888 i thkern94i,b1 bgkfa reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be 100 uc z kqim6gi 6g9qt9 kb6ca*4/Wcz9iagt6cq 6 g /*9mqi 6k4bku?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor atj pj,m9vk4-1x-nq 4 du4:ml f7mho wmh 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15,54tiv t 4gk a8vjekz/.0 W inductive reactance, and 10.0 W capacitivev4 5 vit/4zejk8ak gt, 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 Hzxes0vbl 2 y)0pgk6/lg if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serieslkp 26y bxeg/0)v0lgs?

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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 resie -5v8lfx0n justor, 20-mH coil, and 1.0-mF capacitor are connectefl-ej 8 0vn5uxd 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-me a:pna4ql lk-f1(re 3gt: j;cH inductor, what is the impedance at:4k- ntree; a1gaf( l pclqj:3 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 /wjx a3q)vxr7a 20-mH inductor, what is the ph 3)/ 7xxjqrawvase angle 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 seric4 niiv fg3x8gigr62s8i(9 ytes circuit with a 20-mH coil and 1.0-mF capacitor for a83g2it68ycigi fv4r gs (9xn i 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 caeiqv xvqo+n0u ;/h4 z.pacitances is needed in series with a 100-W resistor and 15-mH coil toe+4qv/qv h; znux 0io. get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put insty i 7kz0)zv8 series with a 450-mH inductor at 5000 Hz for a total imzkyi78vs )tz0pedance 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 1i( m-t.szmg)btx1ejput in series with a 100-kW resistor at 1.0-MHz for a total btst 1mij(-1.e gzm )ximpedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. Whatwigw xcc* fb*twb(mz+.vl+ k*g 5 ng:- is the impedancem xcgzw*fbt+vb5- *c. (lw:wk+ gg n*i 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 neeo4v. +;jycgb hcr (1kj,d;qm qkxk-/hded in series with a 10-mF capacitor at 1.0 kHz for a total impedance o hcq(.rdk,;cj k mqv x+1j/-;g4kyohb f 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 1.0 kHz for axdsz7a ,)gob tz,:9k i phase)dg,,o7z9kst x a:zbi 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 kHz jklds uxwg9..5/ l+ n+)n i,xzsf1vmvfor a total imsu.9 xn+ xg+zj k1v nlvlw/).5sdim ,fpedance 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 1p vwt+kmj n6 mg;e6*fk07kefa 100-mF capacitor at 120 Hz. What is the phase j;we*pm66kmfgtf01knk e7 v+ angle?

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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 wxg9a1n.:fj p9a)y dk Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capac9gk9d:jfap y n)1xw .aitor 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 consists of a 100-W resistor, ai;n9k .-c gwshvi32p/1rsq xx 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 the circu g93-xiv1i2nxpqw /;sh .csrkit?

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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 capacitivei(+ sq 5fcqm2 msdoo28 reactance 30 W, and an inductor of inductive reactance 30 W ares( 8ommi2o5q 2s+qfdc 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 cont 8s9 ajf+r3+lehub 6oujc4n2taining a 50-W resistor, a 10-mF capacitor, and a o ju3cb rnf 2has4+e89lu t6+j0.45-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 wir 2wa;o 99nou6z;qyh*i;im eeo90mf pth a 500-W resistor for a phase angle op 69 m9efoeiozmqu02h*9a wo;;nryi;f $40^{\circ}$ 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, a2:jk8dr1qk asj+h7 3 0b drmiC = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from tharjk 2i h7+d kbdsj:8qm01ra3e 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 seric0 kom,g2mi /hes circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V po2h/ cgik 0,mmower 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 circuib ),(g a sewkj-ic5)+ok qpg(tt 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 impe,-1jv8bctefv+3 bao4(s w haadance of 60 W and a resistance of 30 W. What is thefat ,wcab1- voea( b8sj+4hv3 power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit contalaqs58 hd)*ud i 7b *)d,ereieining a 50-W resistor, a 10-mF capacitor, ai7 *dr,ea)eud85 d *ebis)h lqnd 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 capvb5;cx8ac *xg acitor and a 15-mH coil in series?5xgxcv *b ca8;

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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 for33)cb *mltlsepki1 7a/2u vlo a resonant frequenc 1loip*u3mlkb/al 327cvs )e ty 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 withbbt,gg;nb wnu7ks: 2g1y7*dz 2wvkm * a 3.7-mH inductor for a resonant frequency of sk:,n;d2u*gm y172vggwzk*bbb wt 7n 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 placed in series wi p(cqdek3+dgo rqid0+4ro wc 4p3c8i 0th a 30-W resistor and a 40-mH coil if the resonant frequency cpdkq +30c44 cd80+3 rrp(godweoqii of the circuit is to be 1000 Hz?

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