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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: 游客未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux excryk *hq 1692lrd f+beo-sbbh (ept

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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 tha q2 h6wa0 y 5f;emmjzu /v*9vxia:ib8jt 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 whpzgdgq rpjm,)7 m1i/2 at kind of change on the q, dp/ji pzmg1m7)2rginduced $emf$, 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 thodbl8v +5jn 8igy2ua(qk r84vrough a loop of wire produces what kind of change on the induc5y84 nuvqld bvk8o8riagj2( +ed $emf$, 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 kind of change on theoq 2);zga 4vf2 i6shyr induced4;zis o 6q2vhr)yg 2fa $emf$, 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 fik)i*u- 4kldyj a8w8.do g 3ktrom 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 dire4cfl1duq5 k h 2pwa;1yction of an induced current in a conductor will be pw512;u4f qla1cdh ykthat which tends to 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 hokvh.e4wdtk 63(d.hfa 8ek9a horizontal table. A bar magnet is held above its center with its north pole pointing downew h.ah.(dh4tveok9k d68kf3. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abovxv3nj0n 9o/lse its center with its north pole pointing down, and released. As it approaches the coil, the falling mag3 9s l0xvonj/nnet 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 tvld8;zrxwpc :m uy ip.*8wg7e,+ 8utaop in a region where the magnetic field vector points straiuewuxmdp.*8i l ca 8v8t+7g, py:;wrzght up. The magnetic field vanishes 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 x6(85fkyicn: kvq uc- magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed fromki vy k8x-n:(qccf u65 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 horizontalg9dcco4 :q o(/ btdr(t table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what id4o:db to9 (c/tg(qrcs the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries abzmh/ xa2ft+5n ever-increasing current northward. Tax h+t5zbm2f/ wo 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 loop(awo/npk0o, 8hgpc wk );9gj g of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed 98o gjwghc);k , n(/wkpg0poafrom 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 aboutf w8but lo.6:g an axis whose direction can be varie 6ul gfowb8:.td. 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 speed about an axis whose4adyw*l zoka6; rgo3 z v22z,cnr2e5a/c v 0il direction can be varied. In a region where a uniform magnetic field point32 c,yzklvz4 irodz; ac5w 2ro*0l6vn /eaa2gs 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.x(geqtx8 :dww :d :tf:q3pe/ g
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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 fb3+b;q a.ipi8 d/ixjthat 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 fieb asy qkc; sdq** j-q8ozzy4sb4b *g.0ld. 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 gt) k0 xlqp bg205pt6tthe east-west direction) is moved northward at constant velocity through a magnetic field tha)tbx25 g0pl0qk6p gtt t points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant bzahz rq v(ly 5a7 (g)a2cwku0b4 .4uuangular 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 vzeql;bqh8e7s,,; ;yxve m0 q transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each secondd7yymlu djm(51xjuh.g( g34k . The frequency of the yly7 5k4 dm3x udjj((g. m1guh$emf$ 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 devi7g o0u.mgwm ;qce used 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 t5tn,y u;p cla)t 3j, zezvk8*jhat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the primary cwxbmy+50j8gjynq10r v)fs5 g oil then it is 0+g1s 8 jgjwyvx0fmyr5)5q bn 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 secon, ke2mjcchhpd8ct- 6hsnf-1 5dary coil thecpchh186j 2s,t 5- cm-h ndfekn 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, tho.x+ kplm*2a ak-mk7qe power input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circubj4 pu:hb3n x ayt*h5;it,

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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 se:iwltdfqhnf6 c61xq-d 9*ze0 ries to an ideal battery of constant terminal voltage. At the moment contact is made with t60qfei 6zw 1nq9 -fdtlc d:xh*he 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 seriesox tc)/;ics1s gy+mi. to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, thegy i/xc1i c;)sm+.sot 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 antj /ug7ho9,l lc0k2snd 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 and resistance R is cl6s(g9i( rxp-qru ,lmonnected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time cons2ug: *udpu+ o1*e;vngz nvm0ztant for the cir*; v1uuuo*nngp0m zveg2z+d :cuit 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 series olshc*yojwx 0 , ,ze9;to a battery. The battery is suddenly removed from the circuit. The time const0syz9*,;xwje ohco l, ant for of the circuit represents the time 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+hrdu-4b1vyhvsxev /n,h68+ab5nx 5ducs :t have 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 an AC power supply. On this cicq g)2k* fv2uercuit, 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 v;p9;d fgaxor90t ye0an AC power supply. In this circuit, the currenardvo9 0 x90pft; gey;t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changzt/5-v1w emrezm/ gq2vo: t.oes by what factor when the frequency is triple1e :m2twtv5-oeov/ mq/. rg zzd?

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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 inductordpr j :c.-0t6db h,-r-q adjya is doubled, the inductive reactj rcq,:--a.-ddt 6hr a0ypbdjance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor appr i+(gstzsf6f1q (5ykig. no 6eoaches zero, the inductive reactance of th6 y f+i1sigsek (6f5(qngtoz.at 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 powerkq06qqmd (abmx- t 6m- supply. In this circuit, the currenxaq -kq(m6-m qmt0 b6dt

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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 circurac )/bzi z66a/lkb0zn r8k,uit changes by what factor when the frequenc kczi krbn /a6,l)b/80zua r6zy is tripled?

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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 approaches zero, the capas4ns:iwj*wn +citive reactance of that capacit:sn4ww*+i nj sor

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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 i)ona;a/ tg. l2 zk4ktinductor and capacitor in a RL);n a/ktz gk.iatol24 C series 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 /7d 79i 44vkoydrds p+vw .htgcircuit is defined 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.n1r.70oy hpmm h7 4fdr The impedance of the circuit increases if R increases. When is this stat n d1hrf4m om7pr0yh7.ement 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 tp,r i j7;vf); :iz71wcrpwmcbhe 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 circ5yt ;s ./ar2vbl3l jrjuit 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 m+n/tg; wa mqqtjve2fnrh y95q647n 2LRC series circuit, the resonant frequency of thatwn2+9 74rte a;h qnmvqt5qjg6f my 2/n 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 circu p0qy9y3)ijurq x; cg7it that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circui0ue.,py;dym(3 ass lkt 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 0.10h)at glbdv+-xfa )(d ; m is rotating in a uniform magnetic field of 0.20 T. Find the magnetthvfgdx;daa-l) ()+ bic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is r*ax+1b :dfs9mu pw* raotating in a uniform magnetic field of 0.20 T. Find the magneticwum+* x1b :r*adasp9 f flux through the loop when 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 igpf2llxqy+;4pq+ 8 hq n a uniform magnetic field of 0.20 T. Find the magnetic flux throughpqgl+ f; +l4hp2qx8yq 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 si(azh6rfrj5xjs/f 6ige -55 lfngle loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil c8fi.a:lpd*zn aag ),mhanges 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 sqta9 h8bns o*wxk/qaj z9m-8y3uare frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find mtoajn 93-h/ q zk 9bsayxw88*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 15d *3f 9izutz76duomb- 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 and area 2nesvyc; 7mhg1 ;ma*m $0.20 \; m^{2}$ 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 win+p:alld6sv t zqno1.- g span of 60 m flies horizontally at a location where the downward componenallq-6. tzd:vo1 nps+ t of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angula1jj+acmaqiz (n (2cm e0b64xzr velocity of 2.0 rad/s about a verjz(b 1imcja mz0e2xq(nc4+ a 6tical 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 loops57td/ka.kqxh+*n s ma 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 ar6j8k7qch9aho 2t-yozcxvi 9.ea $0.090 \; m^{2}$ 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 loo 3iiv)/ 0tbejops on 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 ij 0b i3e/vo)tuniform 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 1y)qvz8 pbq5 :r 2er p xb2z2xivnz4h7+00 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced 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 generator with an output of 12 V jc2xr.dw +e/ cmaximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotatew2+.dcr xjc/ ing 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 geneyi33ema urz47rator 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 moto0 hgah83hba62 s1u akzr have a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The ro98aou:qq)2k.a tfu motor operates on 120 V AC, and when running au faao.otq)r:q 2u89 kt 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 com(v idm5z3h:e nnected to a 24-V power supply. The operat 5iez3(mv hdm:ing 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 Wef5owv8* fz)eh xqd:: is connected to a 24-V power supply. The operating h:x8e*w:zvd fefo)q5 current 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 6.0 W is connec 3)ajl0 8t2y 7hpffsweted to a 24-V power supply. The operatingtsfa)pw f e28 0hj7l3y current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to redn scmy..rtv et05dsmle)6-, d uce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a tran2gdw9) 3 pdlyn a(dxm/.-iaeb sformer causes 14 A to flow in the secondary. l)2d. -xye/md 3aipgn9d wba(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 are0sp06e,iug u y2qves, necessary in a 110-V primary if the 24-V secondary has 100 tur0s e vg s,u2ie,upy06qns?

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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 h.mth:fp fvfsp /d *x b(cx3k 1i+(e/wcoil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is tikp f+bpc1xwfm.hfs:/vh /(t*( x3 edhe current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the2lclwz x*)6mncfua: ; primary of a transformer. Assuming 100% efficiency, how manyxaf :*wnlcc2m; )lu6z 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 1yv.sp2:q giws ;z76oh h z6q2y0.0 mA. The primary coil operates on 120 V. What does the primary dra6 yzsp z7vi:.26o2 gq hqwh;ysw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformerefytw ko o788, bav8z l1x oy25vb+wt) has 60 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 7txza) b88 kfvw+wbl12oooyv ey8 ,t5in 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 hv12a k4dqp;im7h,duh+r 3/fcv j)ps on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is apphir pp /+qv, hs3;1ujm 4fvdc7khd2 a)lied 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 200 turnso8 y: i, x2i/o9nqksxw. If the input current at the primary i/kx ns9oi:2w,oy8qi x s 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. n65xbu q-n p. s,+ziwv If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to be6vp5 nzsq+x nuwb,.-i

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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 transf zy 09fkjyc8p8ormer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the powerkpj9 80yf z8yc 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 okvr 2f,dv9s i kyu8 5ak;:s8wis usually stepped up to 4500 V by a transformer and transmitted through a power line of totak: 5ks8 8yasiv,; 2od v9uwrfkl 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 ; c -n9tuhv5za120 V. The voltage is usually stepped up to 4500 V by a transformetz v;95-hacu nr 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 fdc* 5eb+9lesup to 4500 V by a transformer and transmitted throug dc *5bl+9sefeh 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 50ich (3 fql7,kox+qs dt.v*qg 5 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A.xi(f q,.qsd+k57cotl*g 3qhv 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 m 5hu0g jugw76x lh+8thas a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped u+wxl0 6m ugu tjhh7g85p 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 1000axx.sw:/ b7nw1)qjpbnd 6 :wv V. How much less power would be lost if the power were transmitted at 3000 V in)nsv ab 7wwq wn1 xxd:.6pb:/jstead 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*p4iouixh4mi 0 i;+ly A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in tran 0myihuo+p4i;xil4* i smission 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 cu9b*1rprwh7 l krrent of 5.0 A. How much energy is stored in the coil's mag1 9lp hrwbr7k*netic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W r 9pd1v:.(kszf j 1je8xbh 6eudesistor and an 18-H inductor. What is this c duxhe1v9e1s. j:6fd (j bp8zkircuit'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 ciry3 n7 pob5e+jdcuit 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 thuj39o rfa.f 0he 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. Whf qmk4lx6o pjzvrfpo ;0a7 +z+/r yv8:at is the resistance of the lamp?r zkmf0 q4yoplvjx6zv+o 8p7+ra:/;f

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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 skz,vy hoq5 fz1)ep5c0upply. What is the peak current through the resi5zf, hykzcqov1p0 e)5stor?

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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 ndo5v ) vw(nrqd;y8(i ac power supply. What is the power dissipated in thqdw58vvno); ( nr (diye 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 idigfm 1,7(kqpqfyx 6,s $I = 0.80 \sin (240 t)$. 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 resiston6kj,+fsc0mtzv yb 54jp -.b5 (fkyhfr 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 aam7; wn mnooi-) -+dq h)jdm5r 50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH a o: y0fk 1ouslu6o)/itu62d /pubh5tinductor 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 of a 2.50-mH coilbf z0ttirh-ob5fo6z q0e/my8sb 72b 3 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 wen 4 x qb2cuq1,,x.tyc 0v)jgW 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 necessah4hwgjg8l mk/2w y *s)hs)n.jry for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 k : jqnd j( /h(i-,tgx5ilx)tlfHz is applied tj(ni q/:5 xj -dl),hitfglx(to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110- 7kv +m w-im*no;z cljw.cg+)qV, 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 ju*o36x;( aevpqvp5v rs*9u4sv h vj0reactance 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 needevj/(6y 1+rjmnm/d,cq o lmf*; bhb ;bgd 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 capacitor have a reachi8 jj +7;rqzxg7g e) f6vlre*tance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacito pix4rz-e-yb icy+blv -:qi1 +r be 100 W?y1r-pc+b xib:+vq-i yez4-i l

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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-haed.-h5 /d qe0rj .bimF 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 resi5 ts cb.0bkq* 9zylyslmbb/83stance, 15.0 W inductive reacby.b 8s03b/qlys *9c ztkb5lm tance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20- zekfcm)o i-(w 7:a1fze23daftk r6s/mH coil, and 1.0-mF capacitor are connected in serie1ec7a)tw(f2/arskd-3mzkf : fi 6oezs?

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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 rswml6nm ut4()v f ;7oa 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connecw st)nm76f(r mlu; vo4ted 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 intc-lms8 igx )/ series with a 20-mH inductor, what is the impedance at 1000gmx/-8 l cst)i 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 20-mH inductor, w* 17mf22pmlche x cx++xhucx)hat is the phas2c1 c eh)hm2xf p+ *uxc7xx+lme 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 coiz;/ej8m)4) rm tq twq)uiil1bl and 1.0-mF capacitor for a total irqt qjwti )ui))8 z1b/m ;ml4empedance 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 nee*c 9tgr(w hu:rded in series with a 100-W resistor and 15-m uhw:rg9 *(tcrH coil 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 series with a 450-x;vx9ba.6j oh mH inductor at 5000 Hz for a total impedan.xo x6 vhaj9b;ce of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz8p3x7gl19 .:fbp;2w8b kqocihy s frf for a total impedance:qh8by3.p7bpw1cl; f2iro f9f8gkxs of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in serlubc/eair1n o7v d uu*/76 1.i1.wkkt5w x ixqies with a 20-mF capacitor. What is the impedance at 1000 Hzti u7 unq i6ickr 5/x1uobe11x7 l*a.v/. kwwd?

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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 seruitoi:* 1ix2w1sz:ld ies with a 10-mF capacitor at 1.0 kHz for a total l1dwzis 2iot*u:1ix:impedance 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 amr cd64h-ua:ot 1.0 kHz for a phase angl4-h armcdo :6ue 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 iid02k wc (nb8too9o-fn series with a 30-W resistor at 1.0 kHz for a total imkic9tbf0o8(- owon 2 dpedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at +9/tc1 ive.sjgdv;bv 120 Hz. What is the phase angle?tv;c s/+bvv.di1ge9j

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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-mirggweq55 fw8-)o6 lwH coil, and 1.0-mF capacigwefw8 wg5l- o5ir 6q)tor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resio gl-i jh 70i9hgw.qb-stor, a 10.0-mF capacitor, and a 0.350-H inductor. The cibjql9gi-hw h0i -7go. rcuit 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 capaci3 9bkxzjuoi1i;yt 4g5 tor of capacitive reactance 30 W, and an inductor of inductive reac41 xo; bguk5ii t93zyjtance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containinz s z p:xcs(*6u/3uozig a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when conne s:(c6x*z3/ipzuuoz scted to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series pa5ng,qxx0ygv5 (:u b with a 500-W resistor for a phase angle ofv(x gbqpgx ,5yn5a u:0 $40^{\circ}$ 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 whalmk/t5 5)z+;gmko-i/upr kzit frequency should the circuit be driven in o5u / l/k )r;-t pz+izikmko5mgrder 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 o 19ok8 6dvjvowith 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 12vvo oj1 d9k6o80-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 isfrla x(qd 8d+w ,y57 + t;8qwx-kcyhkx $63^{\circ}$. 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 h)xh+lgydh7 ) lwy-;d 60 W and a resistance of 30 W. What is the)hl h x l+)7hdg;ydwy- 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-W resistor, a (qt5 wz 1c1irjm21juj10-mF capacitor, and a 0.45-H1 1 (jwqrc1t25z jumij 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 frequeh q6et 3) i7c9hqt*2x xr.ddtnncy of a 1.0-mF capacitor and a 15-mH coil in series?3.ntti6c dxedrhq*)t7 x9 2hq

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a remt/ lnh/v2bb;sonant frequbmlt ; //bvn2hency of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed inwq39 /-gtgszt m7.07qjkk vtu series with a 3.7-mH inductor for a resonant frequ -0tu t.t7svqq kjz97mkgw/g3 ency of 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 pl8: d9eic;j uz8ye4ye( a 2knfc4lsyn0 aced in series with a 30-W resistor and a 40-mH coil if the re2d4ie4n8a0ku:; yl(8fc eyy s jn 9ezcsonant frequency of the circuit is to be 1000 Hz?

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