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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 magv 060p6isaq pgnetic 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 thatkrtsy+w5x q0jxl8c+ou6(ir4 the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops ofdhd*o -1 v8lvm wire in a coil produces what kind of change on the induced dl8vmvd-o1* h$emf$, 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 xe-4 ro ( tg)e9xp0fcxof wire produces what kind of change on thx)c g -efp 04ter(9oxxe 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 m e gv:xu3,vf 3f:eaq*loop of wire produces what kind of change on the induced,3: :e vfx*f uegqmv3a $emf$, 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 ma2ohq ofd:,1 oognetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced curreng6t,iad2z px (t in a conductor will be that which tends toad 6igtx,p( z2 produce 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 horizontal table. A+mpeyp,o) 6gxrvx i -+ bar magnet is held above its center with its north pole pointing down. The stationaryx+ r+- pvpx6)i gomy,e 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 baa6 ;/ 6zmedjechoj y;2uo0 yr-r magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed;6 eje2h;d/jmau yrzco -6yo0 from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vectowfkzf8s6e t) :clv o:5r points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sf8zc6 kvft 5)sol: we:ense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the h8 *v f q1wdftq vl-wqm)68qf3magnetic field vector points straight up. The magnetic field suddenly grows strongemfwq6w83 d)q1qvq- ft h flv8*r. 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 in a region where the magnetic field ,oxj +*nfll9cnbz17 ,p8f jqfpoints 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 disappenj 7x +9 8cj,lol1bfz*,pffqn ars?

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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 8dj e a b-t9ex(p8y7kytable and carries an ever-increasing current northward. Two coils of wire liea-7(dybt ejpx8 k e98y 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 loo g+m+ 08,hbmesli e4n:g lzy0jp of wire with the north pole entering first. As the no +gm+n8ge,lim: sl0jye b04zhrth pole 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 rotaqr h jm(6c(p)d jmx+i1ted at constant angular speed about an axis whose direction can be varied. In a region wherec+mpjmq i(d1rh ) xj(6 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 rot;2 b(p+qemg koated at constant angular speed about an axis whose direction can be varied. In a region where a uniform makmq pgeo ;2b(+gnetic 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.xsr1t5w( +v.bx7wh cwk+k e5w
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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 au1 f,llyg+ homq2;o .k(kbcq(n $emf$ 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 mmaofj3n9q lq*/t 3,*gbiuy+bagnetic 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 directi o93yc8;:pgnjp nn b32cygb8e on) is moved northward at constant cy2 8b;bg8j:3egnnpcyon 3p9 velocity 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 u3lyfne, se:;8qpo k-w )izj)rotates 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 t)7 fgj*2ju+f5adwr w vransforms

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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 frl:i6jh q: kpfsck/l/3equency of thkq:sh:lfi /6pcjk3 /le $emf$ 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 usedbw ,g(c7- vpmo0wmy m+ 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 e mb; wm5vlawf*fy964to6hy8b1:l 7y+iccn ythat

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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 pr9j*h1j2a:m qcy0p 45(n tgaba ayt9o rimary coil t1pra2ja*b9 n(j5 hotaygqm 9c:ta40yhen 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(6 +i zx*dnx+ep2 yngf the secondary coil then it is gpnx+xfy *d(e 2ni 6+za

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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 iv4c5kxcnr ; ewnbv5 o hthc6o7m( 7/k*a9a 9vlnput

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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 resonanthm95x) vg6l dlhpcq:, circuit,

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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 2;w (yi-nz ;kolz1;b3 9 odtsrtu)j96tdngdi in series to an ideal battery of constant terminal voltage. At the moment contact is made with the batteryio1 lyo3 dn(-s 9bzzt;iudt;j6;)w9gr2 n dtk , 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 connectedtz o7x4 3,iojg in series to an ideal battery of constant termx4og 7j,ot 3izinal 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 is connecte)e 6)ls -,sonqbf6 kzed 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 resi 37p ruwg.pfv* x,aot*stance 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 inductokmuawu8lw-+ *r are connected in series to a battery. The time constant for the circuit representsu8aw *+-wlku m 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 selcy,*h ps;tr5 ries 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*h 5l,tsrycp ; 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 hdsz(*a:lob; 5 s kxwm-ave the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to a khqf a1l+ih5a lr1p+eh 2wa) 9tv2a2zn AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this cinv.rt79lde oa906ok.2n cfem rcuit, the currentc.de0t nlv m6f97.ako 2n9 ero

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the 0z9qo 6gkh*kkl bd.w2tqqk5 6frequency is tz qktk q5 6hkgb6wok ql*29.d0ripled?

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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 acro8mwtwpy7.zxv -8 hpb;ss an inductor is doubled, the inductive reactance of that inx h8y.mz v-p pb8t7ww;ductor

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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 zeroev, wf1+luw( k, the inductivew1,e+ wk(uv lf reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In thiylk)cx sh+6 9ts circuit, the currek h6+s cx9ylt)nt

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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 fga 576a0vxb( ( wnfkxgactor when the frequency is tr awgxk(v 6b50xn7gaf(ipled?

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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 apprjb-q6aqna4*jp1 4k)ow(dt v w kx8r)boaches zero, the capaci-p4j k jbwab61wt)qr4okaq8nd*x v ()tive 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.8 g i:7xnrbsrs;gd:lu7z 4nuwwr6( q between the voltages of the inductor and capacitor in a RLC sen(q;7u wgswl gudn64r .z:r8:xbsr 7iries 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 dep4e/ yf2syp ds,fy ;8q8y.la jfined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases i2d;oefyvrd.p bn8r6b),9kw t f R increases. When is this st 9ykdbw.26 frno;r,)t ep 8vdbatement 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 circf.3 fb nj pzx4*f,x)louit 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 imp93sdb*7p t en(jx7sr :eeyou7)sua+zedance 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 thk sae8)wz*pr -e capacitance both double in an LRC series circuit, the reso r zsewk8a-*)pnant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At resonanc/wynwk zg-*i9du zc/, e,

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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 RLj-):s7ho jyulztq4-a 2ct c1wC 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 rotating in a uniform magnetic field ohw(zlq fovi/ ,0:sz .4ilp.qaf 0.20 T. Find the magnetic flux through the loop whef i/lwzqq z.,p04iv ao(.:hsln 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 fi-3)o 8 bfj m1nl+frnpweld of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magne+ wmno1 )lfp3jf8nr -btic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating x 41cxthb)n) din a uniform magnetic field of 0.20 T. Find the magnetic flux through14bn))x hxtc d 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 i, x0(kjzrzx3 f0pp n3ds 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 changw*k56ka fjq g63 obz-ues from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame wvl ewd yk8wy5 9df(r;*jf e0p;ith sides 18 cm. A uniform magnetic field is applied perpendicular to the pl*0 y l5fpjkyfdwe9ev8d wr;(;ane 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 andc; j.sxi/qardjl11du ls tlg3p6 96i+ 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 and ar5-m 7hifc3oxw: 6 yt2rq: o9hbsjynd2ea $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location where t o//gmqu,. 0ik d gf0y/ggop2ohe g /0o/ggpyo/ui.2m d qkogf0,downward 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 z6 f)nlh0tw(irotates at a constant angular velocity of 2.0 rad/s about a vertical axis thhfz0(n 6witl)rough 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 anctny3 s** yimjffg.5::5n rgfd 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 turn 3z;8lr 4eh bfp.4dbuqs 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 loop is 12 cm lo8y elq 0zq g :3hdphv;tj)1s-eng and 8h1e 0 ):8yzvq dps;lge -h3qtj cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this 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 7y6f,szllew ol,w s( ,r2ep9dwire 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 wisshd +q98ndzcee0+j1l h to construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 Tz8+jde+lqdeh09n cs1 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 masbgl f 54/)/9gnftpd/q jd-7jsioow;ximum $emf$ 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 ;jomx19r t; rtyl6v ;eW. 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 re c9:2sk zvra- r1zxsx-sistance of 6.00 W. The motor operates on 120 V AC, and when running at f-kxv-rsc szrxaz9 21 :ull 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 6.0 W is f;7tpj3fc6f r(r owlcxl 70z8connected to a 24-V power supply. The operatinztl 6 col c j(;r0f7378rpwfxfg 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 t;a)b tsirmt;x;w dy- .o a 24-V power supply. The operating x-d ;rw)y;.bt;msa ticurrent 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 internay3so3c) 4x puil6dqt/l resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is l d x)oscuy36qp43i/tthe back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltage of p6ovn +i iz*v($120 \; V$ 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)3utoe-r6n nc primary of a transformer causes 14 A to flow in the secondarn 36 ncrut-)eoy. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are n/emoshc -e9, necessary in a 110-V primary if the 24-V secondary h- eomes,c/n9has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coili-+5iy wgu vx/ and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current iniyu + -vxw5gi/ 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. Assuoixb 2 v,3 c:;mak46xy cycvv-ming 100% efficiency, how m6xy bmv :;k-4 c3y2ov xcica,vany 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 7500 V at 10.0 mA. Th;ghg1zy ts /7me primary coil operates on 120 V. mg 7/stg1z ;hy What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its sel+ w+:/t jpqnpxym(v7condary coil. If 120 V at 2.0 A is applied to the primary, what volttx7 +vwlnq mp+y:(/jpage 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 tu0 0,li5nuh cwkmudc23 rns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is appliedwu u0m2k5hlc i0n, cd3 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 wrd2z qcc5 6eo, /nx;xopd3/dhas 200 turns. If the input current at the primary is 100 A, we can expect t;x/ endq,o6/ cd3wx 2cdo rpz5he 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 5 yrctg.ny j(7has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of th yyt5cr.j (7gne 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 secondbgnx r5q4fbu2(:gv9 w ary has 200 turns. If the power input to the primary is 100 W, we can expect the p(vbr924ug q5g bnwf: xower output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is+ 7g3udzm ur+xx+p:ao usually stepped up to 4500 V by a transformer and transmitted through a power line of total 7rugzda+u x+xpm3:+o resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usuallyj2iai* 8x uzu+ stepped up to 4500 V by a transformer and transmitted thro+iixuu j2*8 azugh 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 usua9gp; sscvy0c9 lly stepped up to 4500 V by a transformer and transmitted through a power ls; c0c9sp gvy9ine 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 resist79+oqwd3 8r9mrb cwl)9t tgq5r ;mijpance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energ7+o9pmj)rqw;5t rgmqwr tbldc3 9 9i8y 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 of 0.60 W. Ahjsb)3 p3h-ih generator produces 100 V at 70 A. In order to reduce energy loss due to heating of thihs-p3j )3b hhe 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 power wouldgc, )oa8gjq1x be lost if the power were qg,c1 a xo)j8gtransmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A.vnx* qt ru4 2ej5y-kory-( ie7 It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the genq2 --eyvi(jx *yn4rot7ku5er erator 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. .sct5rr:48h ufbbc f ba1nv:a-,vtg5 How much energy is stored in the coil's magnetic c :ur h5r agt-tb.84:5 ,svfvbc1abnffield?

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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 dsridbhh*b4 2cj6l*62 r9 .y*fl zvqya 6.0-W resistor and an 18-H inductor. What is this circuit's t2**syf bzilyr4* c.9qh6r hv 6d2 bdljime 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 q6 bvm(2dnrd:mg,( ex in an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak current?d7:h.i7jh f9u-rwz np

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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 resistancem 67-b-6y y ,wnpxn5ocfiib, s of the lam p,ob-fis5,6- bny6ywcm7n xip?

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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 powe*2eavh;,qw *em vx l(m7jh6 nfr supply. What is the peak current through the re*m(h7wj ve; q2mv e*han6 flx,sistor?

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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 connect( t p*;kazk9ajed to a 120-V ac power supply. What is the power dissipated in the resisz;j p *t9ak(aktor?

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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 resist3 fl8xs 8vph.lor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resijd/v)b8 pon3 tstor 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 rei2- r t4v fl5,dc:p9+t qhjji zf7vzn1sistor 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 ty3u+/ gbo7qs1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance ruum8w, u0f/jm*j.g gof a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have t8,jxev-az yh -jb6/f 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 )r4b+5tj m tm +u;vkpiof 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 indf3fa x 27x0tcyuctor when 120 V AC at a frequency of 20 kHz is appliaf t2c0xf37 yxed 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 throkzc.b)jhza-kt)t -:v):q kpqugh a 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 reacs.olhmrpm-2,+ ll5e k9ft4 yz tance 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 ca hly4hlv mt9 6g*olo8x)8/1 kt+stmjs(n v3axpacitive 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 haveqj0f82 og mwk8 a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will ke9v)b( ys,nzthe capacitive reactance of a 0.010-mF capacitor be 100 W,bye( zk9)n vs?

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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-m abxevvlx (e066 c3pu:F 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 W resistancs 4u,-tvsl.e le, 15.0 W inductive reactance, and 10.0 W capacitil est 4,.l-vsuve 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 rllo/vz+td*ndw;bg5w 2- + j dvesistor, 20-mH coil, and 1.0-mF capacitor are connl++jlg-v/ wd2b dz *tv wo5dn;ected 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 rycc 9wa-eh.ci8/p xx1esistor, 20-mH coil, and 1.0-mF capacitor are connected in serhiwex x.c8c/ ca91-y pies?

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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, *90a62ljzjea w4maxtwhat is the impedanc6 j*wx aj9ama2t4 e0lze 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 connect0- owz)r c/qewsqr97 7 vq*gafed in series with a 20-mH inductor, what is the phase angle at 1000-7 eqz vfr0oq/a9qw*7swc r )g Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF capsi,x*a9 vg+e kacitor xkgev,i9 s a+*for a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series wi5ce tnl00j02mok0gbex ((z dgth a 100-W resistor and 15-mH coil 0 td50meo(kzelggcnbx(2j00 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 put in scna:g4/vpedt 1;v6iyeries with a 450-mH inductor at 5000 Hz for a total impedance ofy1gv4 ac;i /6 epndtv: 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 1.0-MHz for a 9gfopuhc b-4 77v/0 8qt8j d rnwe1wohtotal impedance of rfj-t7un8 o0hw8c4 v1p7 h9o e/qdw gb150 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 serkukp:l3w73z1hw 2 d.upyij+7k ty zl mm+n9a;ies with a 20-mF capacitor. What is the impedance 3k j iuakyz: l9m7 wuh7pwd pz1m32n; +lt.yk+at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series 1+zqq j 3rzr nv**lw aryp2i54with a 10-mF capacitor at 1.0 kHz for a total impedance of 45 rar*qwn1qz25zyj 4 v 3p*ri+ lW?

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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 witm p6 9vl imc9 /r;. rk:wi8n)blojyz3sh a 10-mF capacitor at 1.0 kHz for a phase ani:rc rmobjk)9l /vsymzwl n8;36p.9igle 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.fj39;(w 50 rnoa hma,txogcq30 kHz for a total impedance of q5m(09ta3 rx,wgh; fancjo 3o45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What i;wsrdt osmo2ap7k 46 +s the phase angles aodw+k;p2m s74to 6r?

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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 resist rvn+4 a3avs8)x0r1 byl:xjrr or, 20-mH coil, and 1.0-mF capacitor are connected in se)vly rj :s+ax40rna1 r3xrb8vries?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0.ma,+ 7rn c)meuc.:l) p scudk-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 circmc)a7)se,ccn. u u :l.k dr+mpuit?

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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 reactance 30 W, andni,h)bvu: pfjgbyz ).(jdz o)s6dw ;/ an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power sourpzos)wd,bjjub.:(yng) 6d z) ifv/;h ce. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resid/a8 -dh 0czeistor, a 10-mF capacitor, and a 0.45-H inductor, when 8aedd0/ic- hz 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 hfvejz*;+a*u j*a /hriu(s2fa)e9 xa series with a 500-W resistor for a phase angle o9 *h(hejf+jui*uv;f )raax2 ea*a/ zsf $40^{\circ}$ 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. lx s63dh20yj ;owf ,jsAt what frequency should the circuit be driven in order to have maximum power transferred from the drivinswo,j2jd syl 0fx ;3h6g 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 circuitlhdde5 mk feg ka4a, 1c/8de9( with 12.0 W resistance, 15.0 W inductiv 918lk def a5(e,md/c dkga4ehe reactance, and 10.0 W capacitive reactance, 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 44gxv9bi fu*s circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30edgvfm8h9 9lbs::w2 l W. What is the poww9dmfe: : lghb29sl 8ver 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 containing a 503kmszbcqx2.6pu1w 8+ w:de eg -W resistor, a 10-mF capacitorw 63dc g81mqbe:z2. puekwsx +, 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 capacitor and a 15-mkuoj/pg- 3+h xao9q d7aed +p-H coil in series?hda+k 3 eujd a/7pog-9qo-px+

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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 witvqba8zy v.:l+ h a 4.7-mF capacitor for a resonant frequency o+vvzy.b :ql8a f 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 seri ui9 j+gjyy:x 3tl4g0ues with a 3.7-mH inductor for a resonant frequency ot jg :i+y0ygu3 49ujxlf 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 pl+ho(z j7 ,7dmj47nx3m merzon aced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 100 zj4xhmz 7o( nnemm,+ 737jodr0 Hz?

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