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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 magneticbn (ey -dwc s062o.wuzz+gkd. 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 stav c:7yt w,qy,btes that 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 prjl5 ym-d kv-,boduces what kind of change on the induce ,dj vkmb-l-5yd $emf$, 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 lop p3twfl +edk1 hc;h(6op of wire produces what kind of change on fecl +pt6 ;kd(h1 pw3hthe 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 what9e:5gl/ohm nu kind of change on the induce/nu lho:g59m ed $emf$, 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 f6awyuas/oo 3 7rom a 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 di tim(g rg6ti2 2jb+8obrection of an induced current in a conductor will be that which tends to produce whict rg tm +g2o8(i6ib2bjh 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 magnet is held abv.gzsq88qrz uz)s *mzk2 )kn 6ove its center with its north pole pointing down. Tqr28v*z6u zmnkq.sz)8 sk z)ghe 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 t liwcw(-0s1irable. A bar magnet is held above its center with its north pole pointing down, a- wliisrw10(c nd released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vector poi;vb3nef55q:: aupi obnts straight up. The magnetic field vanishes p3 ;vbqineo:afb55u:suddenly. When 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 where the magnetic field vec do a /kb, rt4(uz;nwl-+i1iqbtor points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the d1ub 4/, nz a(;twrdib-+ lqokiirection 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 /-gquzk.gjq6h4)w j0z/ r zy c9m;nkhmagnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the di 4zqmwyhgzg/khq6z9u k0/jnc- j ;.)r rection 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 olgn6 +/( ;,mwq mdku4rejhad 9n a horizontal table and carries an ever-increasing current northward. Two coils of wire lie qm4el k;dr69/(+ ajmuhdwgn, flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering first. qg70ip +dmvc lix-03t2h 3esaAs the north pole enters the wire, the induced currenttl -h a+vmi dpqc0x2g7ie033s 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-(a:w zt famoz,te uio,2;u.e axis whose direction can be varizu -2au(m.ote e ati;:zwf,,oed. 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 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 spee tes4,89kq;sf ycs;cuf4 p fh;d about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be thef8 s,p;9 4 fcqu kfys;ch;ste4 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.z:cqwg:9ue eu6up+x7 + y e8rt
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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 thak 3y3.mhqx*zse5;d epswr n5 9t 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 magnetic,txvlx 34pu4r 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 directioh 3fqy+ m p3cqimw2d *x,t-mn*n) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement 3f*d2 twm*qi+n,mcp3h-q xy mconcerning 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 angula,,d gzsw( dp-xr 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 transfqd o xa.5h zk)9vrrvvl 7)4fzz;o:2ctorms

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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:vaojt )kw6j8/rhob6o0i - t g each second. The frequency of the ijk:otoaot6 6vb0 r)jw8 g/h- $emf$ 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 to9vn0he)ij scq h;et c8u)gi .-

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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 d)udt-uc t)o ,sc7l9cdevice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains mpjndfk7+ tn qn5v y3c/p u4//core loops than the primary coil then /v4yq3 u 5f+ n/tnpkpj7cd/n cit 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 seconds b;)s9en. gafj csv88ary coi;se bng ) 9svf8c.sj8al then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the powji25jbdq8o xp* r2-t8xhza0 mz(ix. oer 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 resona 9ypu 3.jscvg0nt 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 connect )nbr7c s1py8jtyi-m; ed in series to an ideal battery of constant terminal voltage. At the moment coni-;1 p8) ytbjr7csn ymtact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal :in8 kwj no:;,rza1bm, )femsbattery of constant terminal volk embznwa81 ;) so fnrij:,m:,tage. 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 a9 oetk*j;e1 gR 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 re +6lmi* f zb8yjo;th,deq6 ,sk/dbbw0sistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connec,0 o n53y oabolu;y+5mlcjbg 8)8jy/clarkp0ted in series to a battery. The time constant for the circuitn+,yul 0/p8bblcoycl a0jj) ao5o3k 8m yg5r ; represents 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 sxi+,jw4 w, fgleries to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for gi w4w+xjf,l, the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same u;w vhtc6srtc3y ,w1j 2:gpz ,hnits 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 cem) yq;;uz5l aosin u0av 1*3kircuit, 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 connf zinaz 9g2m)q 0mk-( njm87n/zjyf;mected to an AC power supply. In this circuit, the curren8)29zf ;k zy/j 7 m0fn-(gz mmimanjqnt

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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 rsl j u93n(,rhby what factor when the frequency i,hj rsl (ru93ns 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 inducq3xy(g v- *ltutor is doubled, the inductive reactance of tha-u t3qv x(l*ygt inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the n1au vy o-b yv/r.9an(AC voltage across an inductor approaches zero, the inductive r1/(bvo9-y .n yvaaunreactance 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, tenlmbiu/f); yx,mac*4p /,ujhe curren/)y e,*jm bau4cpx/im f,;ulnt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reacte+gv z.lr3/o fance in an ac circuit changes by what factor when the frequency is trvre3f/z lg. +oipled?

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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 approachese ly0 lmu:9t,d zero, the capacitive reactance ulm ,9lye0t:dof 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 capaci gp50xmhe8h;sn cbm-j(bo0 9ltor in a RLC series jhe;(nmph9 -xlgm0c o b08 s5bcircuit?

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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 as g f(kt, cee.4a82x g5qnhm p .y-kmp6m$\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R incre;pjy ;zso+,9 nbcwx la+ 37giq onyq05ases. When is tn;xc,wgyib+l9z +j o yq3s5 7nop0a;qhis 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 impedance tm;cfi m9 8lg7of 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 impedance74u/j o,+m 8to nqj hdnd(n+er 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,7 y1b5rec.red4str :i the resonant frequency of tha7e1d r: yb5 erct.4isrt 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 rr1dcvl* 2nf7bd5rt f)esonance,

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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 whn.zgz+5 +yxkqg fimr80e2iw :4l- dvsen

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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 ing gm4:8owc pda 96g.nnf4b0/c(qsqdc a uniform magnetic field of 0.20 T. Find the magnetic flux through the looswc90 /8bo(:cfq6agd4cq m. 4 dg pngnp when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radiux9;q7x xyj 28huxnkut91r ,los 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 f 2uqxr9u9yhjtkno x7x,8l1; xield 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 rima k(vaaukn/b -u s1yxy536-adius 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 loo5sa -byamaun(xui6v3 k-y k/ 1p and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is redur fjrm-;4 qxm; m2t+hxced 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 isw54 8onef5c 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 fram6qyj9pf82 /q j:lwy6ozuy-rl em / i(ee with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.5yf 6rwyze/q(/l -8uj6:i qmjly2oep90 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/ m )fyw0xle ua8uos44 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 apr4/y+eie fkdu . *j(xwk/0z(jyw 9xand 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 60s: 4,;. 5fxdamftdsmghmd ;6 t m flies horizontally at a location where the downward component of the Earth's magnetic fiel6t.4s;t g :dmm5; madfhs,fd xd is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constan s/2.bsengtlz 5r*3h vl;mjt(t angular velocity of 2.0 rad/s about a verticasltng tbv./e52 lsh*;m j3(zrl axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-s/ ,cm- -g( awejevk8vkectional 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 e x-a3ct l7qy+/ wcr(saub-e 7wire 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 lq/ 4anz9bek f ) dr .ryk:x()br9jn/nvong 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 isfn xkvrrqen9a9 ()zb/d.jb: y n r)4/k 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 turnzcpp 3:m m/o8:yl q:.4.s(c yglmh2 bxv h6tins of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a s.i:sxo,/ opdoug5;*y bk1 iqpimple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050;qi/oyi.:sbp1 ,g opxd5u *k o 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-:ohp5b;vi rr 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 mo 9)tgxzk du1zi9id1c /tor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor ou gfjc9d6ls1guv/1pw) krj3ja0 p:t.perates on 120 V AC, and when running at full s/jg6j l ju0p gcpadwtrv) :1s9ufk3.1peed 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 resisrx, zp0;da3y9plsx0 cgl* n9i ajc h(+tance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up curre+c9jca3lng0 xpx zs *ip9; al,r ydh0(nt?

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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 internasy 3rgt8 .kib)l resistance 6.0 W is connected to a 24-V power supply. The operating cui b8ryg )sk3.trrent 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 resistance 6.03o(z n(j9tz xaw c61op W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back x 9pnoc1(6 zwz a(ojt3$emf$ 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 09z rx n1kzm jj5jrt/0primary 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 transf.w4u62oluqm bojw ;)yormer causes 14 A to flow in the seconda j4wqy )u6ow;.l2muobry. 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 ar kga4 fjta,4e:2cyf u 8aglofh6/a*1je necessary in a 110-V primary if the 24-V se a*fjc4 1aj,y 4 g:ke6 olafh2/agtu8fcondary 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 coil and a 2000-turn secondary;yposo4*ilk q r* m6iy8djrqj z-*7f6 coil. If the current in the secondary is 3.0 A, what is the curre*yis l-8op 4qi j*ryokr7f6 q*6mj;zdnt in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary +dy n 7kqt; fuqk1f/7gof a transformer. Assuming 100% efficiency, how many amps at 24 V can flow i 77f/qy1tdnku ;f+kqg n 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 pr,2yz4n) et zekpt 59scovides 7500 V at 10.0 mA. The primary coil opera2tkne4s 5z9ep ycz )t,tes on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 64go 1 iqya(6 msls-r(i0 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in tigs1i6o(qsy m(al- 4rhe secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its s6 wahe79po /dfecondary coil. If 120 V at 27ap9eo6d/ hwf .0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its sxuj;(m-1dql1v6 q alrecondary has 200 turns. If the input current lv l1m6xajq (u1 rd-q;at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secon q1;y0h6e8.w9nzrmqi yki k4ndary has 200 turns. If the input voltage to the primary is 100 V, we can expectz10qr9i n6w qkykiy8mh4. e;n 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 transfor-qe9-4 tcs ytqmer 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 secondaq9- 4tec-styq ry 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 usually stec*:1z i9 bz26xn dzblmkw: kr/pped up to 4500 V by a transformer and transmitted throu2:x z z9din:wkmc6*klz b/1rbgh a power line of total 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 120p. u74nlunup4/b(ato)t x d,.or cvj1 V. The voltage is usually stepped up to 4500 V by a trans.) t 7t.lpo/x n c1(bporn4dv4u,juauformer and 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. The voltage is usually stepped ut1lpe(zr zy:(p to( : zty(ezlr1p 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 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 kmkqbr u q,62it65se p0v long has a total resistance of 0.60 W. A generator produces 100 V at 70 Aq 26qr6,e vbi sputk05. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of ucw+o5v0 t,g;pd0 ret0.60 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 wrw,p;0 vgu+o 50dc ettith 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. -hhr((m;apz)9(wo sr 8u ujun How much less power would be lost if the power were transmitted at 300j zsm (ha) 9u(8n op;hur(-wru0 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 transmitt,wcg+lqvw ridr7.u5 2ed 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 idcr 5+rl7wi2gqw, .uvn 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- isq6hb4 4jpdw.*u nj. How much energy is stored in the coil's magnetic field?4 b u*6ihj.s-4pqd njw

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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 thi6uxbe )/ dy.qws ciru.xq ewbdy)6 /cuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where tt/fe *vzd,1yzhe 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 outletxlt e)n/2ez 3e. 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 1b,cyxirww 6u-jy w.6 (lm)o(o20-V AC outlet. What is the resistance of the lax - oyoy,j6 u i)bwclw.(m6(wrmp?

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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 supply. What is the peak / it7y26 blyqlfp.- nscurrent thlyy-7tbqi2 n . p6fsl/rough the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What iv g;8 db6nnaoc hs;--xs the power dissipated in tn gv -- 6abo8nshcd;;xhe 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 c k6:j1 p;up+w,7zu9q kss1dde qa)lqresistor 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 resistor is -h3oywbys g*vn4c,m4 $I = 0.80 \sin (240 t)$. 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 mu1bpb,*e w, *6zxcdoc 7o -jjis $I = 0.80 \sin (240 t)$. 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 in y nrv:jz5w8zr+l 5xi+ductor 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 ohw:(go wrl2;v f 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 14.0 W of inductive reactlmf a /k, dn)ubm7t1k7ance?

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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 inductive reactance at 1 v:rw,m*q7px h000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 5 n17-ncl nlurhc4k; .j t0yerkHz is appliedl5nn 70.ce1; lc tnykhrj 4-ru 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 2w9n3vpcefq,3w9 a/bv .50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitoz)0u u, j,kgkwr 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 (cqnls(c3he y v vvkj*ge1em 3(q+6 k5is needed to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitoro (97yx(ebmqd 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 capacitive reactance of a 0. w0lx(uovladt6 be 27,010-mF capacitor be 100 W?6al,u v0e w(b7xltd 2o

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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 througvmkslpr3;+ -(y juq2rh 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 12.0 W resista6kfhzw;ubvqq*f2 + 8 snce, 15.0 W inductive reactance, and 10.0 W capacitivh6f8 u;z vw2b*+qfqs ke 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 ae/qnchu 0aoft0* 4/q v 100-W resistor, 20-mH coil, and 1.0-mF capa t a/u*vh0/oqnqcf e04citor 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 resistor, 20-mH coil, and 1.0-x4ltn8qso 7+fwiq h0 j9c)b v:mF capacitor are connected in +q9ncw v:)ohfq40b78 s ltxj iseries?

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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 if,i5) payn,d d9zuz*84p qk u 5ztpct0nductor, what is the impedanp*z49ti zd fyuupq8 tan,50dz c5,)kpce at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a xig+og,eth(3: ie ;d s20-mH inductor, what is the phase anh(; xdgt+o , sei:3giegle 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 /qdd 1b)dc 8kvgjhj,7 and 1.0-mF capacitor for a totald gqd)j d vj8,bc/1k7h 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 with aqocw i20n0 pyqzi(vj-zg 9vy..k )g1 a 100-W resistor and 15-mH coil to get a total impedance of 1 0ny(g.g2ovkq1za qy9) ipczi-wjv0.10 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 fot5kvwuh0oaz)cr +bni .*):kcr a total impedance or cw)v+.*nuhbkz)c5tk :o0a i f 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 serie d9qll5x(8e v1wzfrp-s with a 100-kW resistor at 1.0-MHz for a total impedance of 150 kllrqz1x(d 8pe-9 f w5vW?

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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 20ll5lh(v1mz1o prr :x6 -mF capacitor. What is the impedance at 1000 Hlvr6plm r1lo hx:z1 5(z?

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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 ser anx5 (xup+;agies with a 10-mF capacitor at 1.0 kHz for a total impedance npg(;5xau xa+of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for1fxqlipcs d.ws.0;cy)e/8m p a phase / p ed8.1slif0qsc;mcpy.x )wangle 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 dn4ynlp(l xj;tm6 e3, with a 30-W resistor at 1.0 kHz for a total impedance of 45 4 yetnnd(;mlxpj l,36W?

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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 wit*v3kjn5:lfeq xlh :13k pv/qqh a 100-mF capacitor at 120 Hz. What is the phase angle?lq 533* k1 kje/v qlqpf::hvxn

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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-mH coi /uz1/2a2kcr1wvgjv puhb 0( gl, and 1.0-mF capacitor are connected iwpv(rkg21uzc 21/ a0jvgbu / hn 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 resistomym;0 : )nz8wlav 5gzyr, a 10.0-mF capacitor, and a 0.350-H inductor. The cirylzgy5mmn 8 0;:)vw azcuit 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 inductorow ud8. v(0qmkho-gnde8l .bg 55b( (2iebsic of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circ5gmv5k o0q8dsb . lecd i hi(8(oegn-bwbu (.2uit?

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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 xyk8-fuydu 87containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to8u8y u fdykx7- 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 neci icx4dm4r:u5essary in series with a 500-W resistor for a phase angle of cr44 5ximdui: $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At w7w3o:we// /yesz/lvw:pfh tahat frequency should the ci / /oy3 / wpa/fv7lewtzwehs::rcuit 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 circuie*t8ll .osl(u t with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, whet ules8l (lo*.n 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 r eb41fmhfv0( 5rzj:jcircuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 Wmz2::bw 5yro w. What is the5:orw ywm b2z: power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-wt(a7 2xhk4 gdW resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz7 4ad2t khxgw( 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 andi- z,xqxw0r.a a 15-mH coil in series? .0-xa ixzqr,w

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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 s-) bl suqleu67eries with a 4.7-mF capacitor for a resonant frequency of 10e)ul6 q-7ls bu 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 for1faowl9-o :s6ikjgxy ;8ks .a a resonant frequency of 100gfaxo-sk 8os;l16a : i.w 9kjy0 Hz?

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  What size capacitor must be placed in series with a 30-W res8 p(ml z.ioj)distor and a 40-mH coil if the resonant8ozijml (p.)d frequency of the circuit is to be 1000 Hz?

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