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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic f+k stf2w(bd u.j*8pprc 43 tqtlux 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 statesvenocp )/wela5 .4fn( 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 produces what kind of change o(d.;c *d8 uu9owmkeam n the iu cakm; emd*.9( do8wunduced $emf$, 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 loojb/g 6/mi 1phdci yz1,p of wire produces what kind of change on tg1/hidp,z mc by6ij1/ he 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 w:ep4+gss6 /;w hf 5cje6gqs qpa*5rfu ire produces what kind of change on the induced ufec6 qgsa55r4jqps w gh:f/ *e;p6s+ $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field anh.c(jeeg *1kz* kvx d, c6tq*vijr* /c $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conduqh/ubc39pc d.5q+k ra;c/.ueoggi( uctor will be that which tends t +g 5hgpbe ;kc9ao. q3u(.i/u ucqr/dco produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table.xjpzbe9;r82y)i: tcr A bar magnet is held above its center with its north te)r:28i byxprc9 z;jpole 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 kna e 5o 5o(eutfv08g2horizontal table. A bar magnet is held above its center with its north pole pointing down,5k5o gtf v a0n(82ueeo and 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 t-ozzrw 03pb9v lxe o49he magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed fro4p3bz-owvo z e09x rl9m 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 tcne:l i,lunw632 k *x vmqd,t:op in a region where the magnetic field vector points straight up. The magne3ku2vc mwn:nl:lq ,xit*6, detic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where /mz;n x3ln3zr54isam the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what ;4zlarx ms 33 /mi5nnzis 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 an ever-increasingxa -p/i(yu7fc.3x rot curre(x-.3fa 7pixrt/ ycuont northward. 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 loop of wire with the north poljc:ceh4sp-coef-s r+x:p (so r19u yc,yl3h6 e entering first. As the sh+hcsx1(c:9e :oy- rju,4l esp-p of c3rc6ynorth pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constan(jpd3f xz w/hs-+oh/p t angular speed about an axis whose direction can be varied. In a region w/dp psz fh3x/(o-j+hwhere 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 at7c4iybe4 hkv 9 constant angular speed about an axis whose 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 rotation ykc9bvhi4 e74 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..r ,gz5tsjmcdwc2p 3/ttm1+n
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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 )pfv,uvg - *awthat 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 magneth5h q fbrv m6v5v(+iu t6t0op:ic 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 direction) is moved northward8r .ci e+bl *hxc/liw1 x94wn1sp;tsg at constant velocity through a magnetic field that points straight down. Make a state /w81xxb 1.;9icel shiw4 t*nscg+pl rment 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 consqy(a1nq( wr3lxxjl :ks:.lu0*aq7yotant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transt5jp a u3:u.o)3 acaxdforms

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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 frequency of t 9(jj7 sqc-rnhhq-hn 9 c7s(jjre $emf$ 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 7z4zp smvrnhk-bx5 *y hj)g1kic9cp6,:c 1gd 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 deviu )cpl 4kxcn)g7yo 97od5q*ytce 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 n3h0c+zv ilru v- v/t,the secondary coil contains more loops than the primary coil then it is ac+,truvi l3n-v/z 0hv

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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 prima1mds;l7 pq z)iry coil contains more loops than the secondary coil ml)s;p1zdiq 7then 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 power inpdvm .wl ks)yct)8;vi2 ut

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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, pc/m,/;/r6 vvfos nnl

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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 covkngidk5e- o;/. ( wz23jgf nwnnected in series to an ideal battery of constant teo2 wz gde;.3k5n(n/ijkgvfw-rminal voltage. At the moment contact 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 battery oftb pa ies c)hmup,(ib; 5km+50 constant terminal voltage. it;smp(e05bp5 +cbhu ia , km) At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connect p7j4dlj,r9) zqizrk2 ed 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 inducto8a gsavd 2pid 71h/c/ance 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 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 connectt,j lsgzp: i4(l1h(kl ed in series to a battery. The time constantl(,zk1s g pl (ijlh4t: for the circuit 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 connect v+t 8z wulu8sgbmywg bdr- /fr4)/f09ed in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circvb r)+mtggz409 rlw/u /s8- uw8fbfy duit 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 have the same units( 9y,r kg ,elmoxufna1e.- cg2 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.jk/ xbb8t9 04ef s,pbo On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is conneck8ttm*fb,f pkzp vln4i32(8q ted to an AC power supply. In this circuit, the currentm vf8nf2 i t84b,k*kqz3tp(pl

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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 g3ncx93 a ivdj)nzgrft -..3aan ac circuit changes by what factor when the frequency is triplxvzjng ata. d) 33g .i9frn3c-ed?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the inductive 5y 1.r+lovc* xcinzd52dsck8 reactance of thackr2i cox+5 dn d8l1.z*cs5 vyt 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 ACx 5j 3gndce(g 6;ugu*pjf+,z*kd f1ei voltage across an inductor approaches zero, the inductive reactance of thain uupeg5z+;jd cgf*, 3j(xdg 1fke 6*t 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 .z s7uhceh48b7xro 2icircuit, the currenu4.78i eo s2cb hx7hrzt

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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 oaz ; t3o8r1gnfactor when the freque; ao3 zgtn8o1rncy 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 cag3g(/j ocmq77 guw2 tlpacitor approaches zero, the capacitive reactance of that capacitorl u2w m(q7/tgj7g3 ogc

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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 andrx 9a ql7xr.8.5ik f we6keo4/3zlolh capacitor in a RLC s9l.l.4 3ikkoaewf5qzxrx 8oh6 /e7l reries circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined as s,f,f3 yn ta9r$\cos M = R/Z$, 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 ofg 8pvev,hrl9qzd3q q6q-y 1.l the circuit increases if R increases. When is this statementqqv 9p6v1q3lz.yql d -,8hger 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 imph-rk7n);q*i arb oj8u edance 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 circuit j;z(u,6 oecyfincreases 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 s0icy/zy z0f5a ,q ww0yeries circuit, the resonant frequency of that circuit0,cyq5fzi 0 yaw 0zw/y 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 resc nb5vrjmgxt(w9 *v8h*35 4eh 5wnp;0o kztwsonance,

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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 whenp 16z6ww .sy d8ydl*smc7kp 5e

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic zcm7nl6(sdt4x: bk wux(,dcm ye)j3 .field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are paralley x7 ,(nkw(cus6lt) d cm:bmex3zdj. 4l.

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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 fiel9b 9z;0gnkse pd of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field ve;e n99pbk zg0sctor 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 in a unifof-m. obgq8t xu x32wc+rm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the lowx+ugx 8bc3otq2. m-fop 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 loziip 9x uww:9s(.dwj 8op is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes ufe6:cmuz, 7a 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 fpav6eub2 (r: b3sfygt6dr6/w( f j k2wrame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If theewj2 3yvt:ffpb 6drb6s6(uw/r2k g( a field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns andad/dlm0w-v c u ae+(;h0ik aj-8e8qzz 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 +3ex/9h qq kqizs6(l iarea $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location where2.,;sr bm mnkc ih0a6u the downward component of the Earth's magnetic mcuhb6mrks.n0;a 2 i,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 av+q ck3e1kcbjr,)o1 yngular velocity of 2.0 rad/s about a vertical aj b31 o+,k)kcq1eyvr cxis 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 generatodkam 0 /viy; eal44e1tr has 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 area /24- ggt( i blg*npmvp$0.090 \; m^{2}$ 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 rectangulam 5rsh8ywfa:(r loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature r(: syfmarhw 58otates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wiroe+a,bmz* xc1 tdq 6y5af/b k0e 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 witzu-,+bd mofi8 e:vy7vh 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 rotatind zu,m7eo+vb:8i -y vfg coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a togwts)/p) 4q0riny,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 6.0dhs qke4gzg - 8z-,(ho0 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 motor operates jb3w/shi4 ah0zq0+l xon 120 V AC, and when running at full speed it generates a lhh qw00ja4b3z/s x+ iback $emf$ 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 rdsy rt3o-8q n3esistance 6.0 W is connected to a 24-V power supply. Theo t3ry3s8 -dqn operating 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 resiswv1utm w/: hz6tance 6.0 W is connected to a 24-V power supply. The :6/v1zutm ww hoperating 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 connecte glu g.epy 3h-tb+)ekqbf 62l5d to a 24-V power supply. The operating current is 1.0 A at full speed. Whbq5hlep-gk2g t y3bel+ 6)f.uat 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 voltagh2 l4t/f ya:m 9pdsi pk6 vkg2m3)8xkme 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 a+t,hao:a8 fu5 u5jvl transformer causes 14 A to flow in the secondary. How many turns are in the seconj58vafht:luo 5+u, aadary?

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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 turn2 r qm(tgku3,ws are necessary in a 110-V primary if the 24-V sek 2(, gw3qrmutcondary 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-tp;)jzs i n;)rtjwa/1 qc-jl*turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primar)q/n c; 1 )laiw*tptjjsz-j; ry?

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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 tri/1* pg8ft -pwfbg.pm ansformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondap gp8m* .pt i/1gf-wbfry?

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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 9xo ;jtay/f*px x, o,7 gpok,r-idc:lprovides 7500 V at 10.0 mA. The primary coil operates x; ,c*par7lk-/t: 9y, xxfoidg o,pjoon 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 60 turns on its primaryg( 951 i: fytthkso6aa coil and 300 turns on its secondary co fa hi5(ska:t 16yo9gtil. If 120 V at 2.0 A is applied to 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 primary coilhabeizc,3la;x.f(s-4 o+9 ep j/tx mn and 300 turns on its secondary coil. If 120 V at 2.0 A is ap-(s/meiton9 azfj3 hxcp.4el+x,b ; a plied 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;mb7x. npd ux. 200 turns. If the input current at the primary is 10ud x7n..p;b mx0 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 hat8)1ai6fxje yz :g+ux s 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltaag 6zj8x1yfuxit+e :)ge of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 t 1 5xcrj*,crtgurns and its secondary has 200 turns. If the power input to the primary is 100j*x, gr c5trc1 W, we can expect the power 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 vo/kr3ky,am,ds3gv ,eu(er5/np. p v ug ltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. uspvd ,3ng /rp.u( v 3,ekyeg,mra k5/ 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 12sk:(gu7 a w5rgeyv s680 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. 85 :s6ya ku7v (gsgwerFind 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. /ovbhz85 jb m..x+bko The voltage is usually stepped up to 4500 V by a transformer and transmitted through abzvhjbom5k /b..+ 8ox 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 km long has ajh8k 326gbwblk p0l:k total resistance of 0.60 W. A generator produces 100 V at 70 A. In ord2wk08l k kbpb 6h3l:jger 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 lilws3pev7 22 h3prg8 qgne 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost wew g82ql 23v37rghps phen 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. Ho cm9c 5ael2u0sw much less power would be lost 9c5c2salue0 mif the power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 Ak :;dttll ui-4. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator outpu;tu :4 t-idkllt be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in thezmrd:e4o(f9t coil'9e mr4fd:tz(os magnetic 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 resistor and an 18-H inductor. Whajhar8yl1c(3n i72qe ot is this circuit's timy3l17 r2qj n o8c(eihae 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 voltag - )d61zv e7wettl-xgbx4*tdye in an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is place9 qrlrcwnj1 )/f48abjd into a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. Wha,iwc9y bqy0l/: v r,zwt is the resistance of the lamp?,9w/,0 cy vwir:ylbzq

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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 suscsdu+8i25 vrpply. What is the peak current through thr 5csduv8+is2e 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 is the powe0rxp4 7fl 9ydwr dissipated in thel4ry0 pxd9w f7 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 is q-hza yt 88;.7x2kptzvyy.h e $I = 0.80 \sin (240 t)$. 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 resi28 1m-*x ec9 vaodxphrstor 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 resist j *xtvf/zj5;uor 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 lbw y:l- too6s2z6ex9 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 reactanceq rj-p4 fe-y3kuvgv95 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 wi:9 id/1nkwo q:nsfw)n ll a 14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at sr8 *l cl-cq*a j)-qnt1000 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 q g4z3g-49no5mhmuo u-mH inductor when 120 V AC at a frequency of 20 kHz is appliem3 uzg4 mouoh49q5-g nd 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-mms2t)d( n y9egH 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 reacta,03nn hibafq35/veernce 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 capacitivecl8(o*db k1 zy 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 reax./r1l1(cbsq+0 jvb x v36-muvw;/td domi n lctance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be 3-jdmo)2*ly eu rj)a c100 W? )o)l3jyrcm -jau* 2ed

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 onu6;) wp/k ecu5vn-bHz 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 Wt7*s(m duyj +h(woy)w resistance, 15.0 W inductivtw) u7h(ys +* ydwjo(me reactance, 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-mHsb f5zka (3b3;ze0rbn0na -mk coil, and 1.0-mF ca3s( nb-5n0f0 bm3 ekaz;akbzr pacitor 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 ifqr )8a2bwk b2g,8ck,ct3 ie1.0-mF capacitor are c c,c a3)i wb8,tki2kfeqbrg28onnected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductob8wauyh( xm53r, what is the impedanceyx8 wu hma35b( 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 seriesj*x53zi6g euc with a 20-mH inductor, what is the phase a ceu5g6* ijzx3ngle 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-gsxr;ewsb( 0xq x/d5,mvx d tq x./ w,y.9b*wpmH coil and 1.0-mF capacitor for a total iw0x mx(/dp/t qd*,bwvsxyx.s b. ;59e,xrqwgmpedance 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 sl qc-g7*; o9xhpc*etq/m c ao/eries with a 100-W resistor and 15-mH coil to get a total impedance omh c*q-c//o*;eo7q cx9gtap lf 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 seriesxywml i.5x-4 r with a 450-mH inductor at 5000 Hz for a total y5i4m . -wxlxrimpedance 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 serie g6ok,9m fa3 b kbi;1i0ubapm,s with a 100-kW resistor at 1.0-MHz for a total impedance,kbg;3amfmo06ikpb, b1 aiu 9 of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. Whatdqum-,c/h o/vs8tdr 2 sy)3we is the impedas yhdu/s3odv, te8mwc/r 2)- qnce at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in s;- eo*,ximoa,o m- ;ww;opdtreries with a 10-mF capacitor at 1.0 kHz for a total i ; ,wom; ;t*adoe roxio--,pwmmpedance 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+r xsv.x k0wsqk lw595.0 kHz for a phase angle. +k k05rxw sx9vwl5qs of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with az1/ .+a gnu/mdc1 tgzf 30-W resistor at 1.0 kHz for a total 1dga t+z.mn 1uf/cgz/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 seri3,,,qcdq4od 3dyy 6,lojhclp . rwj)qes with a 100-mF capacitor at 120 Hz. What is the phase angholqy.,oqlp c dq64w,ry jd,c3d,)3jle?

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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 ; (pgwl7,f1)wkmp gy pa 100-W resistor, 20-mH coil, and 1.0-mF capac 1yf 7mpgw )kwp;l(pg,itor 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 resistor, a 10.0-mF capacitor, and akr mp+rp//xjobo,m/3 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz po/,/x borjm +o3 mkp/rpwer 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 inrvsinj55/- vx)cn 2kr)yki vs/+lar6 ductor of inductive reactance 30 W are connlrai5 y+ nrx6ssj))- /5 crvv v2/kkinected 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 containingvgljp1g8 : v .-,5kvearr3 lbt a 50-W resistor, a 10-mF capacitor, and a j,. abrpvvggv3e 5lr 8 1l-:tk0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resi5 vo vmi5lzidyt8p. (.stor for a phase angle oz . i.plmv8ydv5o 5(tif $40^{\circ}$ 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.d,atf1/x r :zb0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the raztd:f x1 /b,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 resi1il-qs3;4 pbf a;sbjrstance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V 4p;b;i f-s lqas r13bjpower 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 cixkti+czzv. - (6qn- aercuit 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 3)x )kb09 wk,1zithd m*icmwtr7 a5d 5r0 W. What is the power facth 0x5mad) 5i)kdz9cw*kwm1btrrti 7 , or?

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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 fyhop6 c/ 9 86dimy8h(d:jbndmor a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45mjyo/ch d(d8n bi6 698hmyp: d-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 ( bk(;n uznm4nof a 1.0-mF capacitor and a 15-mH coil in series? zb4nu( (kn;mn

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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 eax7 at/:.fpc ,g k5hdhdq-p( 4.7-mF capacitor for a resonant frequenc/.x( ,adtke7g fcdp h5pha:-qy 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 in series with a 3.7-mH inductor for a resonanthyp1s2)fwwc2 frequency o2wy2)p1c wsh ff 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 placed in series with a 30-W resist i56 h2hdscbe5or and a 40-mH coil if the resonant frequency of the circuit is toh65che 25 bids be 1000 Hz?

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