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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 u t0ejkjn 6y;3sco7iv+osdj3 )nits of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of inducbb34+/1wf qbwtl 7r jgtion states 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 kk1jfkcx /3v aq1r2e /;wbbdw ,vpx66 bind of change on thek161exj23rp/w ; bqb cdk,6vbwx/afv induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the (/nt8v bwc /yxmagnetic field through a loop of wire produces what kind ofcy/(vt b8nxw/ change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of chanoibo33 qg651 dr xbq)cge on the induceb5o3g3cqd q6xr) 1 biod $emf$, 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 magncjkev:f6jt 5w --wp+ketic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in mwd7t:j4bx h n(o9xr:a conductor will be that which tends to produce which of tm x:xwo 49djrh (nbt:7he 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. A2g+pw gb v6sm sxgpx/6q l4r19 bar magnet is held above its center with its north pole pointing down. pvsl6 gg/xw426rxgq1p+9 msb 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 bj7grc 2lru6r6 6pw* dqar magnet is held above its center with its north pole pointing down, and released. As it*rq6 drw6uj76c 2 grpl 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 *j:okw+ gtxvyxs+1, kj9 *yagthe magnetic field vector points straight up. The magnetic field vanishes suddenly. Whegsvx:yag kw1+,oxj ktyj*+9* n 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 dld vi0, vpxm3,j3m-s, l/lhn level table top in a region where the magnetic field vector points straight upjn,/idvds3l , mll0mv3 h,x-p. The magnetic 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 topbcl57 706dmfes1f8rqp/k du o in a region where the magnetic field points straight down. The magnetic field disappears suddenlyk /bl5 7m81udoq0fre 6 fcs7dp. When viewed from above, what is 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 h-8ph yl b3xdt:orizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, o pt 3hbl8yd-x:ne 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 loopstv-lj2o8 +hh23p edet 7k, xx of wire with the north pole entering first. As the north pole enters the wire, the induced currenttj3vx7h2 8potsd hx-l2k e+ ,e 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 wir9puz :+xlpbs ncju /f4.vhs+ 1un6 r3be is rotated at 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 3/u1 x4j prbus l+ zncf9hvusp: +bn.6axis 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 angus dajef .s:ye 0262:kzll fg+gg7a0jrlar 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 if dyr0 al:6k fg:gzg2l+sf. ej 7se02a jthe 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.e/g 3b4ljd cly 7rrg,6p 1vg+w
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that tvjvj53id+d-t f+4m l 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 field. Th5 tw,r m-mv-wle $emf$ 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-westh*ut phfyj ttt*t ,cmp5w5 p5y4y08e7 direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acryytf*ty4j5tph5h*p8t0w ecu ,t7m5p oss 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 -,nlta yz1*r9ti z9mfa constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transform(9drun,n+ gsulwxubr 79/ve9 jy0f -us

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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 60r7f-4ju mka r3s8 znzi4d* 3bm revolutions each second. The frequency of thzbm7u4i*f3r azkm n3srd -4j8e $emf$ 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 de5, scu+lry5up r/a6ztvice 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 thatwds 6brv+ 4l6*dpdl s8iz:5ct

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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 t 8h 3j8hbip+lohan the primary coi+oilhb 8j h3p8l then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil co+(g3 z6omj3lt3 dnj gontains more loops than the secondary coil thgndojz j63 lt+(g3o 3men 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 1y:hfkn/(d gzra mp+- 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 circuit,aweg:)6(tpihva 6 h /d

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal:dq(io49 x u qv7pyrod8 oli+- battery of constant teil(yo+8r9 uq dxoo: q7-4divprminal 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 of consw l(m.e4wk8q ck6jb.ftant terminal voltage. kk.8 lw 6ecw4bfq.jm ( 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 resistan b da4t2n 0uz.mapm5r0ce 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 inductan/q*ytgp8tfav zkfe, ;up c( r)5l*s3sce 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 indz dfyq9j, ,xksw ;i/ qa7s; 9rx7zkai5uctor are connected in series to a battery. The time constant for the circuit represents the time required for the cur7fyr/,zzi7 wqda5qks 9 ijs;ax,x k;9rent 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 inductxpfzj/95 8/ ey6som laor are connected in series to a battery. The battery is suddenly removed zmf9x6l / j/pyes5ao8from the circuit. The time constant 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 have the same units z yr bn.m,20udexcept:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the cz u2hc-x87xx5gd j(l burrent

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the curre 0vdr j: vb4g24iqdjx:ntd:b2 jd04r4vgj viqx:

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor whb8v5oq2 t9kye w2a mf:en the frequency 5yq tve82k w:mfob92a is 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 across5-.bth6 xyu ga an inductor is doubled, the inductive reactance of that ind-6ahg5u .tby xuctor

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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 apf ,qngx8z- v zcf*-31.themy pproaches zero, the inductive reactance o z n*3p. mfx-z tqhef,-81vygcf 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 7 k)y0-dgvvks power supply. In this circuit, the curren7ksd g-0v )vkyt

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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 f 3d8vw rknpg ebb-+z,7actor when the frequency i v7p ,z+- bwg3brn8edks 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 z ug37*y(g2mzd5 s(lu h;fx kefero, the capacitive rl3kg2h x d*m5 (seg7fzuuf y;(eactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the volt ;:rozhypu +*9fby yb0ages of the inductor and capacitor in a RLC serie9ubr0;yfz:o ypy*b + hs 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 de,7 xauv3 ibo a4dnbf/4fined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The.huh 81,2g y6 gapgcum impedance of the circuit increases if R increases. When hg 628.pugmay h,u1cgis this 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 of the circuit increases +u4ydco 1s d s+:y7drpif $X_L$ 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 i:w5awwm 8p ru0ncreases 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 circue; qvs3;n(kxd z ew(6git, the resonant frequency of that circu(vez6dgse;3wxq k(;n it 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 4*8jxfjwl av ,s,z0 ebthat 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 serieks5 /+:dz v5jorg ov)n86fpeys RLC circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform j:*2 9 ab-tr bpdkikc*magnetic field of 0.20 T. Find the magnetic flux through the loop when the pl k b*a-jrt*2i p9k:dbcane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.rj0yp3ddl; : bw-q9bh20 T. Find the magnetic flux through the loop when the plane of the loop and the magnby9 rbphjdwl:-d 0;3qetic 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 in a uniform magww sot ;ep l cyt+ytuib-5)wpa6 b52;:netic field of 0.20 T. Fin p l-syw p6tu:coatye +5bw5ib;)w;2td the magnetic flux through 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 singlee 7:(kxfdf/g+ 8 ),fmwrisrd f 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 chui72d 9a0)cgzuo0m xranges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cm.s9ocfam0 to3kxf9wh50jf+ o . A uniform magnetic field is applied perpendicular to the plane of the coil. f9+5 k shoxof0 mtcf3wo9.aj 0If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns a iu*2y +hnn 60lwbjtkfuy7t:5nd 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 a e kf,mnx( knee s,r86u)2y3wind area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontg68hne sw,j p:8*oyamally at a location where the downward component of the Earth's* ,8o:hwgsa jmyn 68ep 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- owvy 9hffgi 1+;y,om is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its e,mi9o woyff v +g-h1y;nds 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-sectional z vpb g0qti85fy(f -r0ld8 hz3area 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 consil hqu8ly it)5 qwwl: 52kq9gpwq -8 he+):sjjysts of 100 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 $emf$.

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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 z 4qu,ovg a8y6is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum qz,a 6oyvu84 goutput 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 k s.:*.bp:g 4(6un fyjayohi wxh9e i;100 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 Vyhy2(7 2y ezun maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. Iny2 y2zhy e7(uf the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with t/uzzf k:zn-0a 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 hsq mzq-tzor5*l,z- f: ave 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 motor operaj*zth drnft 9z.ki liu*hq-1:, h/.vptes on 120 V AChlkf- * h.*u tjh.zrq:inpd/tzi9,1v, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is coicwg a8up yonf9pe(v-f 21q( wv807htnnected to a 24-V power supply. The operating current is 1.0 A. What is the start-up curt ap27g9fq-hpi8(8wy w1 nc(uo0vve frent?

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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 6.0x+ a-+dolhj2ji1j0s d W is connected to a 24-V power supply. The operating currensjhd ia0-2j+ l1+odxjt 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 connected to a 24-V pv+lzaj3g l 686 q0rabx)ich0nower supply. The operating current is 1.0 A at full speed. Whjh n3qrl)v g c lxi8b66aaz+00at 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 neededd(e7 t u+;do(v-q 4rg*myb pbv)y ;zekv/x2vq to reduce 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 transformer causes 14 A to flow e0q4:dp ttnm:de j,km0nwa4- in the secondary. How many turn d eta:nw,q0-n ejtmkm044:pds are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necess1 4*ewam56b f 6.jh) ,rzklutt,fdqknary in a 110-V primary if the 24-V secondary has 16 u*wjt.6ef, dfz5r1 mbqkk,ta)n h4l00 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-tur r /wvy+cgdd8,(cunw- n secondary coil. If thecv-duc y ( nwgw+dr/,8 current in the secondary is 3.0 A, what is the 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 the primary of a transformer. Assuming 100% efficibwcea 07ned75xxcr0 iy8 9y,-r r oog7ency, how many amps at 24 V can flow in t8c io dr5,7eae0cnyxyw 9or7gx r7-0b he 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 provideh *0+bp sxtgd5s 7500 V at 10.0 mA. The primary coil operates on 120 V. h *d+ p5gbs0xtWhat does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on2 xs,r7 dnxai* its secondary coiniars x7x,2 *dl. 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 i-um :2 5 iwg7gkaoc,sturns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to thegoi2u g:i -5,ms7wc ka 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 s w(a8i h.,xjmturns and its secondary has 200 turns. If the input current at the primary is 100 A, we can ea( h m8i,xw.sjxpect 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 transfor ,c(y+mf b2 uyx*/am8c0nv(yu 3bzo almer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expecy8y 0yma xfz/3bn+2o a(uv,(* mbclcut 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 transformer has 100 turns and its secondary has d jins5 j)v yl4h:2t0dk).pts 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to bei)5 ).y2:nstsldthjkv 4 jp 0d (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 steppd+wn9qmo0 gj;z a5(woed up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the priq+(z 09;aj5o omdwgwnmary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltaguvvhm7jt /n8db o2 u86e is usually stepped up to 4500 V by a t7vo2n6 mb8t/hu v dju8ransformer 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;fy p0dtkpsv 2h3hzbm-x; ;a8 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost2-sdk8ax;htphb py vz3f;0; m 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 lio/t3lq 1rgs x1p, b/ess*;hs sne 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 hes;o1t1/s,xpe3 s/sl g sb*hrqating 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 totalomq,1vr.a/i jnpkkr 2//cb4a 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 tu4/.iv nj2 q/kacpo1k, /rbamrrns 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. Hoaqxv; /: kq-hfw much less power would be lost if the power x f-q/;:qhakv 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 A. It is to be tran-cuscp kop1y; *pg+l(q) h /wird4e2 msmitted on a line with resistance of 0.60 W. To what voltage msk-clq1/(dh)p+4u*ir; cmyp 2wp geoust the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy mb: lqj+2dp j(c;x lk)is stored in the coil's magnetic fiel p ljc(2m+dxk;)jlqb:d?

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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 cong 0i,lstjiz+ tune139)rcw) qtains a 6.0-W resistor and an 18-H inductor. What is this cci9s+ ,tqut)rnz0lewgi3 )1j ircuit'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 the rms4fkohu4;6:ty - w- 3eleuknkp 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. Wh4bxkr2l :c8zj.ss y :l)vlvt2at 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. What is the resistbpt n4db. +1krance of the lap1tdb .4+ nrbkmp?

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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 fmo3) zq* ph-spower supply. What is the peak current thro-z*hmsp 3qf)o ugh 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 cond835 lkpt w.hd 2tsd+rbzkph 5*x/h:hnected to a 120-V ac power supply. What is the power dissipated in the d8hkl5x3kp wbh/sd5h pz r* t+d2h:t.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 resistqoyu0eje. z20or 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-injt+xu 2)a+ b;j oq(( lgagd4W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W re r6,w0ntj m-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- uq0lqk4z9au of a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive +mk4bvcgr c5/ -)yueyreactance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0czofi,f nz.(: nyjynxu* )k56 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 reactance7me zs g +u.j3hf.mmjdv/+) yh s*re;w 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 xepwz:8n k4mwa*xb ,060-mH inductor when 120 V AC at a frequency of 20 kHz is applie n 0p4:bmw,xa8wx k*ezd 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-V, 6pr k 99,+fhv2bc jforpuwa(/40.0 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 2yi3fum-j7+had 43iu *xnho e reactance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of ca3fo nfxk9( 2 fxyr:mv2;e9cr wpacitive 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 b;sen66x l bj5a 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 reacr: ryg4: anmce9cl99 dtance of a 0.010-mF capacitor be 100 W4:a m9cr: gen9r ylc9d?

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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 68yf sr1b jexuj,/ f/jat 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 resistance,v 4lk qa:tsg8mae2vqq 2.o9 -c 15.0 W inductive reactance, and 10.0 W cac ea:agqo. vk49qv mlq2-2t8spacitive 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 nl5-cp- *zhd fHz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connectednzf*- l hp5d-c 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 cozc(jbj;ysl; (vim0y-(u rjxc5.f)32boiy q wil, and 1.0-mF capacc(rij ;(y y-v m;jw52(xq sb).ozufjciy03lb itor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connectelp9wdjvb7ii 5zae 0w 0m*a1;ad in series with a 20-mH inductor, what is the impedaz;0ia l* a 90evw5db7ma1pjw ince 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 20-mH inductor, what is the pi/ 9mhfu4 oe(xt*r:x thase anr(/*t :umx4 x9heiotfgle 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- x2(l5t kiu;nqmH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 iqt;lx2nk(5 uHz?

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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 sey mf,6d0fxvco+8i1 daries with a 100-W resistor and 15-mH coil to gx6of8mdv y,a1 0+ifcdet 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-m)dg yzk7y5 hg w-)u hfqu;4in9H inductor at 5000 Hz for a total impedance of 40-nh;) )5 uqkhi97g4y gywf udz000 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 y,z0e b/s;jdidsv n *:in series with a 100-kW resistor at 1.0-MHz for a total impedaeds/yins j :b0,; v*dznce 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 w.f:id,a 6 ooeirh. p;yith a 20-mF capacitor. What is the impedae oo:.yi 6ha.,rfd;ip nce at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mFywx nb5 o avb762b4 zvim/(3io capacitor at 1.0 kHz for a total impedance n2 b3 vaix(b ow 4b7iz/65yvomof 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 wiwd4f,tuaj - hg;xde-+th a 10-mF capacitor at 1.0 kHz for a phase angle ofdaeuwt- ,+; 4f -gjhxd $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor atbjhl7yl;/rh 3hnau . + 1.0 kHz for a total in.;lah +luhhy7rb/3j mpedance 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 seriemww,*c9)vu tss with a 100-mF capacitor at 120 Hz. What is the phase tm,w)v csw9u* angle?

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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, mrz5dl :kj*w 7d ,gsk:20-mH coil, and 1.0-mF capacitor are connected in serie*dklsw, : rg7:k j5dmzs?

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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 a s* whjhqh8w rpy)4,:f ;9b iew0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the :ww )bw*;es 8yfhh,qi4hr9jp 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 capacito (i7i4u ireo5lr of capacitive reactance 30 W, and an inductor of inductive reactance 3il54 7iuo (ire0 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 se7h( ya x/lph-ikqji: 5kxl51wries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-Hqjih : xkhlp55/ 7i-a(lwxyk1 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 resistor for a d 38do,af f0qu-yyn-c phase angle ocdo8 d-a -0yf3f ,nuyqf $40^{\circ}$ 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, rghrt +)zm ys;h4/ vp)r2sw b3C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum p2rz3mg)hsswr 4;rv )h+y /ptbower 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 t jx-bs;d2hzh6 q u-it4j1 ktl0i t24gcircuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, 2441tsj jkb- t;uhgt- 0lzqi id2tx6 hwhen 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 cir0- uvm0i+3ojkppf j5ucuit 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 circuit1 6a.b8zvz5mool h;un has an impedance of 60 W and a resistance of 30 W. What is the power h6vol a1.bu o5;8nzzm 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 forr covdi/ -l, 5-sl0y qxcxhe+) a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when con-e -y/5i col0l)d cs h+xq,xvrnected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil i y/fuyk .;fi8rn series?yky /iruf8 .f;

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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 withvptasz5 o z,kh2* rt2:rfbn56 a 4.7-mF capacitor for a resonant frequency of 10az5vftor rh 5n*tpzk26, sb :2 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 vfq*5awr)1b tinductor for a resonant frequency bvt q*)15a wrfof 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 resisssrvmw j 9r1j4m4x (62e1i pxqtor and a 40-mH coil if the resonant frequesxi(4 msr9m 614pw12je qjxrvncy of the circuit is to be 1000 Hz?

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