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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 except*lbih pv 9i;gkm46x4 c

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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 the euo(13kafm 8rv1rakh/nx p )3$emf$ 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 wir czqw3 +/+ 3.;ooaxofgzog,e ae in a coil produces what kind of change on te .,wox+/ 3+;fzog 3aozcgo qahe induced $emf$, 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 strengtnqfl) 4mcq5b4e f q-+ih of the magnetic field through a loop of wire produces what kind of change on the in 5q)ic-e+4bq nffqm4lduced $emf$, 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 ofo gqgp; u0-b+3ofwqo 7zr2pj*npm2xh8nm 6/w a loop of wire produces what kind of change on the indu h-; o7+/ojzpmgnwo3r g* pxu862qwf 2nbm 0qpced $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic fn,bnx1l2 aj7yrv8l) r ield 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, tr 4d:/ hd; dtaya pqd1bd/yt*6he direction of an induced current in a conductor will be that which tends to d a:dtyqadrp1/; *d6t /dbyh 4produce which of 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 h;83t0jf xuti horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viextu;if08 j ht3wed 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;c ;cg9 cem9du. -wt5rmk7dl40)xbp nau9eoy horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it ap-ry d9o mk t uc90xbd;cmw9)caep;.e4l 57gn uproaches 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 yahs.*9 g3 3 sutd1pvea table top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. ug31y pvsh.sat9e3*dWhen viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region wheress*um3exz: r- the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is thxr3zm* -eus:se 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 in a .e.frnibjue *s /6i v 2n*vw8nregion where the magnetic field point eei68vnsvr*f . nun 2*jb/i.ws straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and u(-lohuz9 mj( carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed frolujmoz 9u( (-hm above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the nortf5) vljdue 3dxfs7 e.2ju-l ;jh pole entering first. As the north pole enters the wire, the induced curjv3 ;-jlf 2.lf7d)ue s jxdeu5rent 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 ,y(l p5;0a;qwo, s.txyr i ocqan axis whose direction can be varied. In a region where a uniform magnetic fsw ia t(o o.y;,c5xyp,qrl0q;ield 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 cgesfo)9eqe0o 1)t1mff,d*r jonstant angular speed about an axis whose direction can be o0etfe*) g1 ,f)frm1sjd9e q ovaried. 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.o e;a8xq5 eek/hnn 57b
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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 thapcgz a z .f7q*c+x:*ict 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 mag jg1l8uyl;x/ ( r2qj sp2a uppr2pc+l7jh)ta4netic 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 direpybkwmqq/4lke 4+z /x2 zod38ction) is moved northward at constant velbzp443 2ey / qm8xdzwoq /+kklocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a consfj)8q bl6jd(e tant 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 generato b2oh18 ir9 )jcu:ryinii/.ns r transforms

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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 thq9z8m *dzb9xx n27fujrough 60 revolutions each second. The frequency of the *q xj99 z7d8 mbufx2nz$emf$ 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 twvi5 el c/8x3ko

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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 tho;f -2 1tpazviat

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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 primary k8+4( xlxl nmzcoil then it 8x( lmxzn4lk+ 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 the seconda14gcyfq bwq ,;zr9d(bry coil then it qc9qz d(f1;by rbg,w 4is 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 pow38 h 4t. q jxh6uu6p)wtadmq5ier 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 circuit z;e 8c0pwpdp b6jg2;z,

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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 dfslity) 5ur+8 .iax83mhsz(*cu e8van ideal battery of constant terminal voltage. At the moment contact is made wiv.+ieucz d8a8 uylsi)m8fhr(x5 *3ts th the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery 0 d9vvf:lkm )k- . dr+u1jwthqof constant terminal voltage. At the moment contact is made with the battery, the voltage across the indu 0k m9w1v)+df.j- :tqkrlv hudctor 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 v(z) /.b/owmtj2+ fgpk-cx)p zycb)zresistance 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 resistance R is connected;e m+epm2 1.yzoktfuq/+ x pa* 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 bag7f ik l;p3pjs 8(vyq.ttery. The time constant for the circuit represents the time required for ti.s7k8g;3 vypq(p jlfhe 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 s k)ews9 )7 *feuwr5ofaeries 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 wrf)seo ke5 w*79 uaf)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 exc4ivhwub7/ov1 n s fn/)ok5wn 4ept:

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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 this circui+,t tpyzjzh* p1r4y+k34q jpb ;8kub5hoya.u t, 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 a ;(1c,o xxhtsqn AC power supply. In this circuit, the curren1,qh;oxx (sc tt

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactanc8r c*0-it ey o-xc5ddte in an ac circuit changes by what factor when the frequen-eccdirt*0 x8-toy5d cy is 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 voltage across an inductor is donbtd0:koh7j, d1rvq ryi4r :2ubled, the inductive reactance of that indu:2jktrvy :qnh i1od70d4,r rbctor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the a f:+njly 3tnn,3zpw3AC voltage across an inductor approaches zero, the inductive +3pfnjt:wy33n ,z anlreactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, the cuy6f7kj5) qlvr m2zt q4rren6l 5qz2)7qjr mkftv y4t

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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 wka7d ijw/;lu2 hen the frequency is /al uk 7jw2d;itripled?

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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 capacitowo,2o9; ap-pdl yvc6 jga )qr)r approaches zero, the capaci)o;2g6 vyd lc pqaa),9pjo-rwtive reactance 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 capaci1:cs+v7xkvt/k pq8k 0 :ewahgtor in a RLC seri+hxk :pv :w ect01a/kq ksg78ves 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 definehblk z b8/uln:9.m l;p4mw i7gd 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 ce i8tcp27 8glkircuit increases if R increases. klcp 28 8ge7ti When 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 circuitn a,n8+ +efudb00u) zkcge ji5. The impedance 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 circuit. The impedan* kmtj .) s yu5jf4m64b7iqrvwce 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 circuit, vzvgrs3 b.i )1the resonant frequency of that cirviz)rb 3 .1gvscuit 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 vohuhw,o;7v;z p zrd9 unxf m0 a2s3 c/al8khz-3ltage. 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 circub*g-a g3wd gg2it occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field cyle.v+r qkzflbo1,nq5 )a-c 9i7e t3of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fielc,qt1) z 9-ealef.oy 7knvr3q5+ clbid 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 ju5q qywlpuxlw -.bnv*,f(blt mm, .+f:dm/ 7 0.20 T. Find the magnetic flux through the loop when the plane of the loop qtmm d/l,.7m.:l j(qx5u,l - ww*pyvf+nf buband the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radp1x7z;(2 dp su e w.qh/p3sp97depeqnius 0.10 m is rotating in a uniform magnetic 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 anglze7sq/ dp39nped 7peq. wxp1(; u2hspe 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 ofw adgcs+*:zur3r,cz72 h ik9f 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 fromy ;: :et1wj.1epz8fnpmcb s f zy.-b5n $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with 9.ip 6*zge .pjla+rzlohj,38pr3omi sides 18 cm. A uniforz pr3 i6ojp pi* gez+.lml8jo 3r.,9ham magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an arhkc1 *bg oc,7uel8,sfea 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 anmip2v ppk2qcx 7j:w+ (d area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a locsio bh l1dnh)j(x,;/ration where the downward comp/o(n l1d ;,rsh) jbxihonent 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 (gf:*s l3g sgn:opt*du+t jh: is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while ln : sdtg(* gj:uht+gsf*3: opin 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 54ay np. 2gz5fo0 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of rq /mlwa2m s3d+ 8br i,k /8xj tgty0-m(tf5owwire 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 loopgr:(+ud osz6/qb c ep3ki+1zv4 v 9qkg 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 i9uz(4 rb1kogq p d+vqce/s+g6k v3:z 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 w yd;y w lyjz;v17qm3a5ire 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 ACi 5(p+ 8)ubjfh3fv,gobqcgm 0 generator with an output of 12 V maximum when rotat (5,83oifgbmq)+ cbuj0phgvf ed at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator withw i:q;gnk2 b,bvv :vc/ a 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 opercdjpe0 7jfc5umo;lg/d - 8d;hates 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 motorzarp h2 4 ;/zg1rlgx4h8skrs6 have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full xhs p l2 krar1z/8hgs4rz46; gspeed 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 resistancj6,vq ume/4(dco + 6w*vetyfde 6.0 W is connected to a 24-V power supply. The op dcm +4,f(*qvj6/t o6uewey vderating 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 a 24-V power supply. T,5eljn+3f q v k6ts0jog) zkc:he operating curren:klq , jt3zg)6e5ncs0 ofk jv+t is 1.0 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 resiskoig.iy +. 6gvtance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full ..yoigv +ig6k 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 /gfo84hdy *l h*rrmr-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 transformer causes 14 A to flow in the sa2 + vdq2v.mzzj.+m0ngczr t)econdary. How many turns are in the secondqj v +m+zz..v0rcdn2 2mz tg)aary?

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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 nece oxeer5r8) s(p6ch- gussary in a 110-V primary if the 24-V secondrcx u8o)re- 6h( ge5spary 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 primao*m pkz6 k4y3yry coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A3y6k m*pzk4y o, 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 primhou4:clqvba:549 tz qary of a transformer. Assuming 100% efficiency, :b vtquczql9 5 a:4oh4how many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 751 faw o7;(d t;v8uv(ay31 moe,ph.g ixphp0he00 V at 10.0 mA. The primary coil operates on 120 V. What do xhy 1.ph8(e o7;ovp(1af ath ed0uwmi3,v;g pes 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 onzk1ofs9h ldkn;t (9e wj,-a3b its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, whafje, zkd;9n1osbt( hk93a w -lt 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 p bo50ma;*7anmpf - acniw- jc9rimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to th-nw 5m;fbop9nm aiaj7ca *0c-e 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 and323uyvm zi)vqdan . 01r p+itpsmtc 57 its secondary has 200 turns. If the input current at the av0tr3dv 37put5.+ qzi)2nim1mpyc s 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 secondart*xy+ q/o;2:y opzsfxy has 200 turns. If the input voltage to the primary is 100 V, we can expect the output vol:+* ;oqxfx2yyp/ zto stage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 .va2trjcrzcethpog ,+ /1r -6turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting fricpv-rjg, c2ez .1h r6tac+o/tr tional 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 at 120 V. The vo al3uikh02.tf ip7pn 9ltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistua9fi70thl 32pi. nkp ance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually steppe92iz fs n7h8hxk f2na5d up to 4500 V by a transformer and trans8 ffx9h2s nih7akz2n5mitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepped(i8,;tk(cbb, mnu anv up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentu8bi, kb n( ;avm,tcn(age 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 k27t3xv fdfp.80 pkkc vm long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original enercp 07tk v8 xv3f.pk2fdgy 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 gen1.cem+08n ygjof xf k/,qe fs3erator produces 100 V at 70 A. In order to re3 g0x.kfc,e +jff1q en/mo8ys duce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less powert u6tj 3wdr a5(z*vcakh558sc; d-xe i would be lost if the power were transmitted at 3000 V instead of at 10x - 6( i5d5dv*hk;ztarc5sjet83cwu a00 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 aazv8/7n0e4empmd 0 ur t 20 A. It is to be transmitted on a line with resistance 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 tm0amve /047 ern dup8zhe 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 carriesvlmmh( /lfr03 a current of 5.0 A. How much energy is stored in the coil's magnfh/0(l mv lrm3etic 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 6i,fh6k3)hfk 2wv ( xafzzc n**.0-W resistor and an 18-H inductor. What is this circuit's time conszhfcia3 2kv), ** n6f(xfkzwhtant?

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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 voltt q hy84 j8u1gz)3savyage in an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 1zjxu55 jn:dixgg8 0lpd+.g;z20-V AC outlet. 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 into a 120-V AC outle*+ 84i j0ncr;bavjdg7jd/f 9 -ttwtkvt. What is the resistance of the lam9g-7knw 0tcitt j/vr+fv ;d8 jd*aj4bp?

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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 sg4)svo2 35a5g bjyw0qgo 1pa jupply. What is the peak current through the resiswayas 2 jjpbg0o53)45qgov1gtor?

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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 power diro5 qhp )3g fspv93ht/ssipate v)hf3p3sg /pqtroh59d 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 50hbg/0ry(1p-te,oa6s aq 9w i -s1clr s-W resistor 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-.ya4-;1pwo.;n iqhx icnxq4sW 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 resiswd(nm yp. r5/mws2(ra4ynbly 8 rq12ator 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 ds mh)t w7uo:ha; irn83szlsj3/ 7 j-uHz?

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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 o*i1g txvga(udc80u j 4yq) g)mf 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 o4d o(, hv(h+ n)gkrjza 14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductivet.ou , ihjhg2zr3 h6i-eqf+7x 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 12bh*vm,m*wdxoy gh99 cn.3h a30 V AC at a frequency of 20 kHz is applied 39n3w m bgoyhx9a mchd**h .v,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-g v*kite6i 6+ f 7ouq(b6g+dbbmH 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 ss-fdg h- -qckx5f+*3 vp0( frun hsr+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 to have 50 W of capacitive reactanc kg )on2f3f(nce 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 tu9owxyrv v0b-e l2:/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 10mgf:l,ecn, ( n0 W?fg:m ,lc,en n(

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and b/pjh d4 4i7 kvbj 0musu+,cn*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 k1tm*fdjfq;(w.pd a2 .0 W resistance, 15.0 W inductive reactanp1m tq* .;wfd(2 adkfjce, 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 coil, and om,ap97m0ttd.v 1h e9:dox on 1.0-mF capacipm 7om9,9naotxdd.o 0 hve :t1tor 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 r : x+jax5nh2bhw mgnu*8ft*1arc2az (esistor, 20-mH coil, and 1.0-mF capacitor are connectbc thjruf1g*aan2*n+zm5ax x:w h2( 8ed 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 thel0bz(,ed1r l6p zw0 eh impedance at 1000 zz, lb 1(ed06prw 0elhHz?

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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 wh.x fej 4g8i ld6uxb1/ith a 20-mH inductor, what is the phase angle at 1000 H8.1xb ihxf l4 6djg/euz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit withuvx:cb *ofd)lx+ 2hg ; a 20-mH coil and 1.0-mF capacitor for a total impedance ofdbxuv*l)hf2x ogc:+; 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-Wac;w/vyxx 5g2 resistor and 15-mH coilycxvxg 2w/a5; to 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 putx acufg)9a0 ,t in series with a 450-mH inductor at 5000 Hz for a total impedan)a,09fxa cutg ce 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 with a 100-kW resistor at 1-ifw5 rv*ju9 f.0-MHz for a total imped-uf *jr 9wv5ifance 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. Whatrd0.x rfc dcj+y7)+y kf5hur7-r9vdi is the impedance a df7 xi)j 9+rur5rd+-h .yc fkv0dr7cyt 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in s npd1wy-ze0q mo/n el 4 deh,p(i49md,eries with a 10-mF capacitor at 1.0 kHz for a total impeda d14 ,pmm/0,wh-p9lnynze eieq(ddo4 nce 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 neel(mj.zfe gl. 8ded in series with a 10-mF capacitor at 1.0 kHz for a phase al( ..mefz8jglngle 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/djb3i1 j z; r)f1dmkm a 30-W resistor at 1.0 kHz for a total imjkimjz;m b31r1fd /) dpedance 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 i-8,k/aqsk /snu)(0 1e qoraqhs, wwj100-mF capacitor at 120 Hz. What is the phaq rs eonj/qkw/81kws( h- ,ai)qs,au 0se 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 Hz if a 100-W r9 04 nix:,hgd /lm,,h-a,mz yujphjraesistor, 20-mH coil, and 1.0-mF capacitor a4ahm md /jlxi,ah9ny-h , pj zgu,0r:,re 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-Wo4f5 k1dur.qh nuh8z,bl(7ag resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120.hhk 8 ,aodr 5qgbfun714( zul-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive rkj(wnr/e2/vj eactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this cir// kwnvrjj2( ecuit?

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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 an(ho ngd28 nuc(gle for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz pow (2n(u ondhgc8er 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 phasea1a,-fpxj-; g6hu g be angle o 1gaag-6hp;e u b,fx-jf $40^{\circ}$ 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 = 2 ; ) lcg :span)bww/h9rjgfbor1 iv 2r,)bu(w,0.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred fro1)wl/ fursb 9j)g(2,gc ;r:raw ipvw, h)bonb m 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 circuitl3dv*, mehw6smm9w8 s with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected t3e9dmwmsw*,hv m ls68 o 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 i( 8l+juqdxqctvc). q 62*tjmAC 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 impei uu; y(3u5u o8f/mdgydance of 60 W and a resistance of 30 W. What is the power factor?g;ymf u 3i 8/ydu5uu(o

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W resistor, a r m(c:0/uxgg-hq vqk5qgrt7 ,1m u,k0:(rc5/7 -ggxgqr qhv qt0-mF capacitor, 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 c 4u;ziet q-l3z );fcspwirw/1apacitor and a 15-mH coil in series?r q)4p/-3;flisz uw cwt; 1zie

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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 qj/ lm7ua +dssr3s8fwhgl/ : 0a 4.7-mF capacitor for a resonant frequency of 10 d :q+hms/j3l8 as/r7u gf0swl kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant freq7l.3.dp9espzwt ai o: uency of 1000 7lz3sa9it p.d: poe.wHz?

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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 with a 30-W resistor and a 40-mH bn*h7u yo z:q5coil if ty5 o:7zn u*bqhhe resonant frequency of the circuit is to be 1000 Hz?

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