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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 uni1 b5vn e30tr9ry4w kdxn.:sojts 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 t:rj q+mg4rryf(b-7i1ud; r bg hat the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces z9f io t.s:nd im2l)xtzhb,*/ what kind of change on thtn ,z o*f/mzitxhbi9 d ls)2.:e 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 strength of the magnetic field thzr4 mv3// nvfmi3 dayh+0kbm9rough a loop of wire produces what kind of chan/a n093m4zvkdy/r v+3im mh fbge 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 9d w/d 1rsxzwwv ,0q.lkind of change on the inducesqw zx1,wd/ lrdvw.0 9d $emf$, 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 qq1jl/,f*os sa magnetic 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 indu 4 qus ax,0pwy4d 0m3jus, b,:j3iqccuced current in a conductor will be that which tends to produce wh4c3y0x :,ca0 bisq,j4dsj,u w3 quumpich 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 bar mp;m clyhzd.-n(p+k*c9w jr vmr)s4w 4agnet is held above its center with its nv+hzjw.cr-m;y 9p*dlmkc4( ps4) nrw orth pole pointing down. 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 helmnv3 ljww/8)tw +0ixh d above its center with its north pole pointing down, and released. As it approaches the coil, the f 8 nwxvw0 mljt/3wh+i)alling 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 ta rui vh 3cdo913 gd)acdq0:m7nble 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 induoq dgrc073d mvnahu):i 1d39cced 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 (asc0 d6)jsrdtable top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. Whensr)0sj (dc6 ad 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 t/jj qgqv4yimg 4dr2 3 (pt:zx*he magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the fielx/rq (d gv*y3p ij4q tm4:2gzjd 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-increasi muod j7i tsi-nj4885xng current northward 4ns d5oj8ii8-t7xj mu. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loopbi-3y*psl / fl of wire with the north pole entering first. As the north pole s bly-p*f/ i3lenters 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 whown* g ; jr,kosx89 bg*z0elk+ose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientati*r zb8kn;g kjo *9gx leow0s,+on 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 whoefstpc(5r1tco,vu 5:se direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotatiofv o:cpr,e1u( ts c5t5n 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. y7pjrwts8ct ,kb0 ij;t2*yp3
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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 a01ob4d wz w v+o5hpj0an $emf$ 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. Thqcis4f7 wf6m8 k3-irde $emf$ 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)thf;b2o jj5 rf2m6wm8cme:8 f is moved northward at constant velocity through a magnetic field that points straight down. Make a statement co28mfwf; bo 5hrjcmm :ejt82f6ncerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular velocid: (zi+x7 lvgg( 7ezgnty $\omega$ 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 transformzccsok 2 m/.u/s

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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 frequenmocunr 26c9)t7 vdz-l cy of th-9r2untvdcz6 l7 mo)c e $emf$ 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 toz.q6:37nj j1zs3zwveqe b a4c

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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 devinzsm x5l *iz-lv3rl917vj+vb ce 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 ca;+/+ yirh vv*bauswck8y9dq kb5 r8;ontains more loops than the primary coil then yra8k ivb kus* +hvyr/9d+qcwa; ;b85it 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 contaib :mfm287 ugn jdart16ns more loops than the secondary coil then it is amn87rj6a 2 ub:fgt1dm

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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 m wysw 7 me50lgb30/jyinput

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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;:xq(u;z85kq46lxvssg/n 0rj qa de l,

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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 con 60cqvjxxz ++c. g1mspstant terminal voltage. At the moment contact is made with the battery, the voltage across the r+ s.60mpcgjvq1 xczx +esistor 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 ofxk3 3g,dww f42vg s.xn constant terminal voltage. At the moment contact is made with the battery, vgsxxw n332gf kdw4. ,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 :h904 oxpn vc2tid5y winductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L m8:e1pd,rzg 1 ,mlzrgwo,8 to50lhjzand resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an indueofyyk e(v )+l3-(w 88 kae9tzoq dz/uctor are connected in series to a battery. The time constant for the circuit represents the time required for the current to reac+to d8qeuzwoy(a ee3/ k89fy)- lvz(kh

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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 batter ,ezx qfo2-g8nh1v/ fe ezr8w0y is suddenly removed from the circuit. The time constant for of the circuit represents the hfe wn,/o1 qfxz ve 8802rge-ztime required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the 6rghb6jn(rbf) - 0wa gsame units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the currey*xt0-m u( ld (uxec/qnt

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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 sup r ez, 2ms:gx6+ cy33hfhxd)qyply. In this circuit, the current3r2+,) qm3yzfd:6gxxh ecy hs

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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 tw5e*6p b8 qrfm*ci. ulhe frequency is triueq.frl*5bc i6 pw*8mpled?

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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 mwl)b mkik*ay. 86lo1 across an inductor is doubled, the inductive reactance of that inductolmmk ylw)o6.b*ki a 81r

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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/bu3q,+dh-jy stfc; 6thr. ff inductor approaches zero, the inductive reactance of that coith fs.fqr 3djuyt-hc +f6 ;b,/l

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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 conne.bl1* j m-c r3 zrf3goao(hl:ected to an AC power supply. In this circuit, the curreb(rf1-oo zj:le3rca*gmh3.l 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 factor when the ;hj,wzc q49r5qeg3 ,cxfu*jifrequency is wr4 j qzec,qj;u*,h5x fgi39ctripled?

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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 caparnbmq8e awlpxdn(mps9)9 (pu (f r):,citor approaches zero, the capacitive reactance of thaw 9:((8xpnfb dr(, 9nrm)e)psq a umlpt 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 zf3lwj8*pbhj vi- +/n capacitor in a RLC series cir3b-i+ h jnzj8lpwfv/ *cuit?

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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 ,m5xgd) 9s)f5 8t;sqowe(wkxi 0tti ias $\cos M = R/Z$, 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 impawa b)y95t)q bedance of the circuit increases if R increases. When is thisaqwtbya )b 59) 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 imped8 y:61g7jm d19yut dxcwbq* ovance 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 impedance of the cir: zy8gf6 bj0hicuit 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 sro 6bi9- .xx:;5vr8o6vfb.wcuygph circuit, the resonvx bo6 hugr i.r.os:y-6p9c v85 xb;fwant 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 resonanc7mfj /wuue-2).wn on, mwp6gn 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 RLC circuit occurs wheip,0i ck12xi fn

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magn mr c ::tt j/3;bv1wsg:n qgc-j.t xiij-c5n-getic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loot-j/gg:5g sctwtjcnrjb;-. :1n -xiq :i m vc3p 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 0.201vq.tn g)x(i2 a 5yg*hw11vk c5vcaji T. Find the magnetic flux through the loop whyg(kwj11vcvn g) q5cx2ti.h a1 * 5vaien the plane of the loop and 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 radius 0.10 m is rotating in0f: wnglw9,iq a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop wh9,lq0wgn w:f ien 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 rl9,b5amt( r xsingle 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 cm/iwq+z)oa9f3j 4(ujpey0 7t h q dwi3oil changes 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 withe r e9j/z1red3kj:w ;t sides 18 cm. A uniform magnetic field is applied perpendicular d e /3w;je:je1 krz9rtto 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 b k.:hmu (/(xmt1jzs s6e(prn with 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns an9y8u ,,aaki lvd 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 fliesinn ahgn90er6b4*p5 u horizontally at a location where the downward component of the Earth's mag6 gr 5h4b*0nneip9nuanetic 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 2.0q,*l+pee1 zdi+m)qze;q5d f a m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its* a1z +l)5qdq+ e,epdq; meizf 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 hasbp2r o4dl bh5- 50 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 wire of are6 ufj f4m/272:tk/m ozzrmykna $0.090 \; m^{2}$ 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,b n v.e a-s ey8b/-mt2ugf+4x*uqihh its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotationus mbteh,x qa-fg y-v2/+i8.nhu b4e*, 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 wirem zxn7/i,-nkm 5d. lna9ipwz* 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 AC gen8x hcrn9-qro y;w4hr5erator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotoyxr5;4 h -hqrwrc 8n9ating 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 ge()ezs 8ohqpz -nerator with 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 o3tr olhe j9+e0perates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. Tzgl zcd;)lb46i+s1 )qn zr01 ty mhc-mhe motor operates on 120 V A)rzgl )i cblz0y-1 dq;mmz6 +hsn4t1c C, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V p,3e bhn7/fcrjower supply. The operating curc,7f3 e hn/jbrrent 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-:v2gri b3zmb;,ao5c4 j jhb0oV power supply. The operating current is 1.0 A at fu2b3 gh0zov; j,jc oa5:4bibrmll 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 resistance 6.0 W is connected to a 24-V power supply. Tt6gs4vh:zwowz+ * pdtg:t 1/b he operating current is 1.0 A at full swg* 6bd:/:o zt s1hz+tv4 wtgppeed. 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 primary volt:o 4-ld 4os6rlc4p gsh*bj j.lage 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 142.yj(na cqsxu)a9.le A to flow in the secondary. How manyqxaclj 9uy.n(.s ae)2 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 necessary in a 110-V primary h visecb q)sej 7p *kxt4,8n :y*hbz83if the 24-V secondaryh,kxje)8 3qtv4y*ezb8p h :n*c 7sbis has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary-v 77 bfz/co;bojgc ki* xx5v( coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in t-v; *7/fvogk(xzxc 7bci jo b5he 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 transform;s,gpp+n :pmuer. Assuming 100% efficiency, how many amps at 24 V cam, sgu+pnp :;pn 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 18s76kpwo-* snj mkca provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the prima sj6a k8kwo pn7*sm-1cry 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 tuwxcj m,b76ot6 rns on its secondary coil. If 120 V at 2.0 A is applied 7,c6to 6 xwbjmto 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 primvx4b9)np. fd 3e)bgvawbde6 2ary coil and 300 turns on its secondary coil. If 120 V at 2.0 A gb9 dvbf2.6e3np4 wbdea)) vx is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has rjd:kut; :7tp ck0l79ufg6 m x200 turns. If the input current at the primar k ; d0kxum77tf9u p:jcgl6:try 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 100h*x .59*vj6 mg ipewkn turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can j*.h*nme 95ivg xpkw 6expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a tra4+3g9m .ab ehx7eaqhinsformer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses) xq 93ab+7igehm ae4h.

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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 121q. z trcaxty kd-i ;oqk:a;200 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 secondary if rkqdqtx1yk-ti 20;: zaoa.;cthe 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 currenc3x;qbd 1wq *edg,dd0 t at 120 V. The voltage is usually stepped up to 4500 V by a transformer a cbx,de0qw*qddg3 1d;nd transmitted 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. Theqq(cf bbe +8rodh4,.c,id gi86q g5sw voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line idbhfc5drbi qqs . oe,8g(,8 c4g +w6qif 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 longyhfs8:bkf z(2 has a total resistance of 0.60 W. A generator produces 100 V a:( bfs8 hyfk2zt 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total req 4d. wvbq5/dbz umc/)yf5/zssistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss duedzv/5w qusd)c/4 bm ./bzq yf5 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. 2ak / ( tsjo04/rqtcamHow much less power would be lost if the power were transmitted atk/aq/tr(02oj t cs 4am 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmittedtt*q pj5 1(xyvxr5v -o 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 trans(voj5t rt1px- x vy*5qmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energyd( o 839/nt jdh/taw59ig cimw is stored in the coil's magnetic fij3 w/g95 d8 cawoi(9/tdmtihneld?

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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. What is thimorz.h isb4 ,p07y..du v3sm hs circuit's tios .h zhmd4s i.m,y3 u07vpr.bme constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltago4elbgp 7s u53e 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 ir f w*i-vh-1 skbm+mk xy;/qx3s 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 outlet. What is the rmsav8gq4whm fk81 z +/esistance of the la a+hz 8k mv48gq/s1wmfmp?

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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 pow .cyuz1aqmw6c*5(jc4sto1y 3n h1c cjer supply. What is the peak current through the re*o qtsy3w4yccj 51c jzc1cm16 a(.nhusistor?

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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 thet0,+qb7,mpca k9rm0s4bcd vvg/n gpbg4,d 2w power dissm gk+qv wrc,bsn24da4bgt,7 9/gppvdm0b c0,ipated in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor wt )b fyu:ipfx++ghcy l7d3.)r1- pnmis $I = 0.80 \sin (240 t)$. 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 5qr*)rp:i6jw dmcyw; 5h u:gt yt-rc*+0-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 resistor is qg2b/h0mnle 25 /+9klymxziy $I = 0.80 \sin (240 t)$. 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 reactanchl238oug4dbt e of a 1.0-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:01r6dei amst 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 1sv/wsr8elgf15l cc2 dicx1) 4 4.0-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 Wyy :qon c s,-oce ol/5yx*vf-0 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 whif,ksy uw)y/:en 120 V AC at a frequency of 20 kHz is applied to its,)k:iy wuyf/?

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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 tw/ r.c (wr2jhuoeky38k 3pae8 hrough 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 capacitijgx3- uqj j.e-ve reactance 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 reactance at 1mesn,*j ow)j,r q1 e 7p1ss.i/tp)xgc0 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 10o: m8fr2f/xgkbr0f , q7lkla8h ,v;bq-mF capacitor have 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 the y* .xn tlqlb xme6xvl96m(/ x.l5fk0kcapacitive reactance of a 0.010-mF capacitor be 100 W?.9vntyxq 6lkk lxmlm6l(/ f. x05b*xe

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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 5ax w yb9z1b8mhm* lu,a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 1m8x :kra/+bol 2.0 W resistance, 15.0 W inductive reactance, and 10l mbx r8:/+oka.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 impedancjqhu; a0;3 luafos*mj nb** ;ge at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mFmhj ;0 sfoul*;gn jqu*a*;b 3a capacitor 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.wp.(ofdr1f.i;r kkrvo3c + h at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor arfrcr .+vo(d.3 ko1.k;ipfh wre connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in serieswmog0 bsv1x4- with a 20-mH inductor, what is the impedance atm01o sg xv-wb4 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 seriec ha:ky2uudie(16g*;lg- prz s with a 20-mH inductor, what is the pg :au zikl;1 2eydc*h(-p6rughase 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 series circuit with a 20-mH coil and 1.0- j5iaq0 bwam)1f 0nf(gmF capacitor for a total impeq 05ja1fgnm 0ai)fw( bdance 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 with a 14l fin v:oikc(i cs8,.00-W resistor and 15-mH coil to get a8coi(, .4 i fsc:ivlnk 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 series with a 450-mH inductor at 5000 Hz for wa *pn v16eol+a total impv p elna16+o*wedance 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 hrew86x 0j sx4oum),e100-kW resistor at 1.0-MHz for a total impedance of 150 xjowex)0 8sm6,r 4hue 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 sp)s4wkpowj03 tz.ir * cm((fmeries with a 20-mF capacitor. What is the impedance at 1000(fpwtzp 4corm3)k w *i(msj0. 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 with a 10-mF capacitor at 1.0 kHz for a t 3 6. u c1aygqhld hg0eau4bbma1f*.5notal impedance of 4nhg* u3l6b 1g.abueyadh0mq f5a4c1 .5 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 a phas qum.)pf5 4ckje angluqc k)45.fm pje 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 withs2uss,ba,e+kj q6i / h a 30-W resistor at 1.0 kHz for a totale k b,+ia/uqs2sj6s ,h impedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF :f;1 z uu-610mo uo1uxqxqjzy capacitor at 120 Hz. What is the phase angluq;m -qzuyuf o0:z ouj 16x11xe?

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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 resistor, 20-o3 cxb,k +tcm )zi oozqlymwr7.+p ;8,mH coil, and 1.0-mF capacitor are connectedoqokot y, ;,3.8bm +lz7cixmrpcw+z) 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, a 19c6 arefszc,.p k8v-j0.0-mF capacitor, and a 0.350-H inductor. Thfj-cse 8 p96,.arzv cke circuit is connected to a 120-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 reactance 30 W, and an inductor ey dvo88 9s)knof inductive reactance 30 W are connected in series )n yksoev9d88to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resistor-xppw / jh6y2tr*oaq ), a 10-mF capacitor, and a 0.45-H inductor, when connected to a yptorwqha p-jx/* )6 260-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 m 1i-js3 4hpsgq*8;.wtcjuoxin series with a 500-W resistor for a phase angle ofwj *;3.spshc gj i-mu8q41tx o $40^{\circ}$ 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 = 1zxj)+ 1+xbuz j0.0 mF. At what frequency should th+zjzu +bxjx1 )e circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15.0 yk,9rh ai. /smW inductive reactance, and 10.0 W capacitive reactance 9ksa m/.iyhr,, 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 circuit isgapt):6ciyw 0 $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. 9f y, jc ;lfd9l vl,joyz8 hu5x)ah,1mWhat is the power factoryl1 lj,yh5d9fv 8omf;uza xl ch,, 9)j?

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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 foog)6)i0dp z- ui6ih8vfb ,u vcbtcr),r a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, hpud,- zg) ),ftv8b6ro6ci)vuc i0biand 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-m iryxd0l -,-(zsue lf3bz kuvx +0h)k7rc,k r9F capacitor and a 15-mH coil in series?3z-,7 0hxdbku ufx+r ilkz- cl ),vys9(r0kre

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is neye3j. h* kk we8p2a,creded in series with a 4.7-mF capacitor for a resonant frequency of hkcrp,eeayw8 2* 3 .kj10 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 indumkzp )j00)rg6 qr ejk6ctor for a resonant frequency of 1000 0g6)kprzjrq 06) mej kHz?

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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-mw ( :wchsu7gu hrtk1x3( -v8cxH coil if the resonant frequency of t3 x7 :c (v1 wxt(hhuuwr-8cksghe circuit is to be 1000 Hz?

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