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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 magne:shrd m (3fni6tic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that th7cl+ b g nn:/wk2gq2tje $emf$ 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 oft8:w1jee. mj b sh8/mxh5w.zm loops of wire in a coil produces what kind of change on theset8.8jw5hw zm1. mxeb/mh:j 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 ma;(;qhe9a7 oy pya wf(cgnetic field through a loop of wire produces what kind of change on the indha9p y;(f( wyqaceo; 7uced $emf$, 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/gqsf(r+rc;c zbx(wnj:4ya(iy (q 1mj w u+ 2p loop of wire produces what kind of change on the inducedwwj fzagp:yin(csj1q x(4y +r m+u (2 b/q(rc; $emf$, 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 fieldphul9,()q k.snk, 4 m0njcprd 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 a0* 27xi.t)prkizxf yz conductor will be that which tends to produce which of the following effects*i0 z)xfpiry2zkt. 7 x?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A b*ud:e( z*pg2ehmun7k6x v sib,jv3a 3 ar magnet is held above its center with its north pole pointing down3jxv,uahi*k:u 6de(7 ezmgps* vn32b . 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 magnd.sg * jesevw,z+a vev*2fk++. deva1 et is held above its center with its north pole pointing down, and released. As it .+sk .v*+ +vewezv jdfg2 ev1ads,e*a 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 ih/5 c (c+wu0 g: srbrm7pyjg(kn a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the (g 0 75wkrsgpmcyj r/+hu(:cb 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 magne6pmd ;mzf 4kltj:-.w ntic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the indumkf jdnml -pz:4t6 ;w.ced 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 ye,;r1x)oheon3c.p(ot6r u ,p6 tr+1dczwsa region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced cu+1h yn )t.(, 6;cxczoe3r1u os6p ta,rpor ewdrrent 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-increa b(e, rwvfcfqnh;--/mitym7 6 sing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the n(e7w 6y-cmhqffm;/,t ivb r- 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 po17sm0; gg pj b3/gsk4 hwigqn+le entering first. As the north pole enters the wire, the induced current7 gn 1ws /jg3ipmq s;+0g4hbgk 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 ajvf(tfz,2iwgqr/)4v; hic/p .g-j y is rotated at constant angular speed about an axis whose direction can be varied.j ,.vzjawyg p-/vig;/hiqr4(2tfc) f 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 conq wiajz(4+ls0;c1j t xv 3neh7stant 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 if th 4qasljw0(nt7 j 1ecxi;vh+3ze 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.jm1z gzwg n 3+g4dlin*:kqo 3.+w jwx/
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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 an zwx k(a+lv6+g$emf$ 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 fant(0g 0q:j nzield. 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 northward at coj3or4xl6u;yerqpwk 99l3 9lknstant velocity through a mag;w lllr9 u3xkor9pje 3yk9 46qnetic field that 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 au62solpi-sr6yb3 ; g kngular 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 transformswe8l s.djz:)k

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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 through9nm182wgiilm 60 revolutions each second. The frequency of tg1il8n29i mwmhe $emf$ 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 * 0/jbi 4pe/uokcm:yii2: cmfused 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 devic :(yb96 cgnyco 52ctkle that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the sp1mgf.v as :-recondary coil contains more loops than the primary coil then it i.-a1vrs f:pmgs 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--hwg2h 60;br 2fyryi f4de gmd2; whc loops than the secondary coil then it is adh2h4r; f-2g0c6;rf yywgb-h2wme id

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, th8vf -,p5mw4 shd5ennq e 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 resonant0svamyqn16)ek )r hx7 circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connecc2ya9a gq 6x:wted in series to an ideal battery of constant terminal voltage. At the moment contact is made wi2 aa:qcwy9g6xth 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 px.9icrat)2t+ielj -ejp3o;k ad0,w of constant terminal voltage. At the dl9; a-2)3+. p xicaejjkrtow ,e0itpmoment 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 resista) 0s0q l*mn5y sw*vwzznce 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 Lc gs d.c-1(t1fud dm;d 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 connected in series to a battwr9wvj(;:1f) vh m tscery. The time constant for the circuit represents the time requfh) ;:tjs9rwvw cv1m( ired 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 seriesuw dx98:mnz4c a 8gn)g to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required fo8n 89u)gamnxc :4zwgdr 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 ec54 fsmnwi3 cnm 4pe(jiq((1f xcept:

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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 thp p0n) ww.gg3aa,rls2cuv af4yob +//is 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 connected to an AC power suppl4s q i 4l9)pkk1isb 3a+)dss qbd0xffx1z yn.;y. In this circuit, the currentb1 9qd13 +)kq4fxlaz 4)np s.ssiyb0x;sfdki

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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 wv3frcr.nm06. k wrk,mhat factor when the frequency is t.rfrvm6c.m30n kw ,rkripled?

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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 inez8 vx m2hmi;myu9,0g ductor is doubled, the inductive reactance o,g exu2 hz89i;vmm0ymf 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 inducto ysc6b9g.6pna1u ,mayw cd04 ur approaches zero, the inductive c d9pywnaus140uy6 g,6.cma breactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power kemd -q ns+drunleo:3sl4 26+supply. In this circuit, the curren elsms6r++ qo4:3d e-2 udnlnkt

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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 change b7m4 .bonbpcy (7l.won 8kz,js by what factor when the frequency is tripled7 onc4nwob(8bly, pm7 bjk.z.?

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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, 9.s8 o4/ditnxlv33zuelu. fpthe capacitive reactance o .p u4/ovlt38f ez.u3 ixdnl9sf 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 volzmjnall4 g5d1o2eixbs*n880cf4j c 6tages of the inductor and capacitor in a RLC series coafi 60 emxd24bzcnj j5ls881g* cl n4ircuit?

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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 6h+lp nh*xoj 1 .exet)$\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increasgau6f wuz *0xs6 z94nqfnw4n +es if R increases. When is tu9nw*6f n+gx46wq zsanz4 fu0 his 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 ; mk;)fd4d2x he5zyd(:wxl8efo tu f 2if $X_L$ 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;ugb;q varm3+ ;ktue*ncreases 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 xd4z*q )3nc 6ybhpo-vthe capacitance both double in an LRC series circuit, the resonant frequency of that circxy*p3)vo hc-zd n6q b4uit 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 drivenle9hv o dg s-7wz5neap0*6: jq 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 circ- cxf gp-x(rc:uit 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 magncqeqc27e*n*j l-go/t ;g hgy :etic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector ar ncoyg7 j:* e/cq ;e-*lhg2gtqe 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 if45q.c3l.8rgth ,at bln k o*, x7wztqn a uniform magnetic field of 0.20 T. Find the magnetic flux through the loowxk*, b ,lgzn34a5htf .cql tq7r.8to p 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 in a uniform magnetic field of 0. -ax(s5fn1q+vji 2o hbb7xc0i 20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fieldb 1fq i2hxc jxb -+v05sani7(o vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is vd6- 9zge+dqv*kv/ 58g:zp6om i d4dyre: rtyreduced 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 *obu. 2u/8jvfn . nygwfrom $4.0 \times 10^{-5} \; Wb$ 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 o gb-k b6yc*4wzn a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular t*ybc-b6 4 kgzwo the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wirt y(xb 1gf/xb25n3aqjoe1i20,n hwm le with 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and a r1)vxfi elo99r5 5p-i zt-hfik y,dc)rea $0.20 \; m^{2}$ 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 pvq*sy (42fip at a location where the downward component of the Earth's magnetic fv ysp 24*qf(ipield 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 con):ln xis1aq, e9 0d: whbm0ptqstant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a cm9bs)wqdlt q 0x:e pna1i :,h0onstant 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 e(gki5j o5xg;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 consistsr2d8w,r +xrhv jt:s1f 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 isv -ood+5tmrf;0yw (peh 2l3qk 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 thef(-wt52yo r3+0qkod pv hm;le 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 wire of area irk0cogd0if z4y +gavh c)y1v+;-mw)$0.090 \; m^{2}$ 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 wit9xuixb ; mrriq: vy/ rfycyq)0*d5+5n h an output of 12 V maximum when rotated at 60 Hz. A n5xr)v+y;r5:i qx0 dc /9firym bqu*ymagnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator qeck,t.kq14oj-q9er .x y4 um with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance ofurf m5axq)++ i 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 rgz+1e4fj l33n+ b.urx z :l6cs0/h yol.frqddesistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a ba n+:xq.z+lf40bde/1lf.ls du6 3orzgr3y hcjck $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24c--e) 9us er bxthz /3i.3wmxspyfk80 -V power supply. The operating current is 1.0 A. What is the start-up curp )rs e83t 9 f/sch0wme3xxkiuby-z. -rent?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V powt eqjwt x9)/4(wahgl)7 .ngacer supply. The operating current is 1.0 A at full stt)l .)7ahqxgcg(jww 94e/a npeed. 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 af0y ha1i//pfyi a)p m3 24-V power supply. The operating current is 1.0 A at full speed. What is fh if1/)y /i3m0 paapythe 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 tg2e,3a ri82dc 8;c0 vaakldg. bg7xrh:ty - dxo 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 in the secorn6hb7- s2dy bhs5yq56ztc2f90s u wondary. How many turns are in the se2b y 2-n7ow5 r56dsh90fb6zcyshqtuscondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, howwc84rqb5sdc *lr 0 ov5gw1wb3 many turns are necessary in a 110-V primary if the 24-V secondary h8s4b drvw*c03c w5w5 gbqr l1oas 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 f or/,f ae1:)s,yt-a olegxtgi:x-z 3a 500-turn primary coil and a 2000-turn secondary coil. If the current in the seo1eofr)y t :g a-/f,x ai-ls3eg:t,z xcondary 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 priqnx2 q5 r90hapmary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the second 2qx9hnr5p0 aqary?

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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)+rwutsgu+ s53i h y1.+stoif 10.0 mA. The primary coil oui3+ +gsrw51 to)ut fyh +.sisperates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary cptt e8 ,,vfwpd8cw dl-j0d;p,oil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, whaddv8d c,ppjwfp-0w l ,,tt8; et 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 its9 8jxas0 9 tt+cj wnhw:gww)fe-g02pe primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in +txn)tj:pw g aewjes 8g02whc-09 fw9the 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 turhmu;yo 9xnl96y -e; gpns and its secondary has 200 turns. If hyu e;l g96x p;n9moy-the input current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 tudu7g 3/ixjx:irns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect ux ixd3/ji:g7 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 ha/3wv+l fkt)2g+br bnus 200 turns. If the power input to the primv/twbfrugn3)+ l2bk+ ary is 100 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 voltage is usually sgrm2q ,qt l:16cwwdq6 tepped up to 4500 V by a transformer and transmitted through a power line oq 6 cq wmgl6rt1,w2:dqf total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltadmsp,. 4ufj0 : z+sduzge is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 mus,:d+f. zjup4 0dz sW. 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 c e o95u): aip ug,wo9tue:t642zjqic rurrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted thr59,e)j otuwi69 qogt :pcr2 uza4: iueough a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a:g*n +k bm7ru0ablg2w 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 steprkn :law0b*ub2m7g+ g ped 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 transmission1)pc4vr; vsdy)g2c4hmkt + x w line 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 perc)wg4ckv1x;mr4v + pct h2d )ysentage 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. How much le i2ozg. chp2s/9xiuy6ss power would be lost if the power were transmitted at 3000u z/2 ohic9 x6i.2sygp 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 transmit:(35q pfnlz0zyg 2wytted on a line with resistance of 0.60 W. To what voltage must the generpg: fzq3yw0t 5nzyl( 2ator 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. vfw6o f vk2/a ygh(h(.b4 oop.How much energy is stored in the coil's magneti(.gop4fo(.2hk a6w/fyo v v bhc 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 resicl w6 ngxmu2h x.hix,1atgyeu,7c; ( 3stor and an 18-H inductor. What is this circuit,u nc; ei(w. u,3t6gxy7hh2x ma x1cgl'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 11rf;e te y,y-yr uc(hin 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 placed into a 120-V AC outlet. What is the peak curbbs+y+m z/mx 8rent?

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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 resistance oh) b (xz uoh0mcxlpc(e-a 2qw 2.:*imkf the lamxz-hpm amw )i u2hq0c. 2(o exk:lbc*(p?

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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-Vfvospr43 t)u5lq )7p (p7 oeop ac power supply. What is the peak current through the tfu3 (5opeps)o4pvpr77 l oq)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 i2p26 -ba ; medr+ lxiqibi5.eos the power dissipated in the resistoi mbl-d b25;ar+iox62qp .eie r?

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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 39eglj722c qfsvug3ys, snk8 -W resistor 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-m5.vwoe ds i70iw h.+nW 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 res*chy mjj 0wb76istor 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 inductor at 60 Hqfz170to)g917c rpa6q bse yjz?

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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 coil at 1000x-5*st /pohqt 3k0ln9hrxd1 o 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 14.0uavx88m u,qi)u x47po-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-: r9+ftepqs ac6vxr3 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 rw2dmo, + ,csca 60-mH inductor when 120 V AC at a frequency of 20 kHz isdmrs,c2 ,owc+ applied 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 z*2ojaw/1ber 79*rom0 odfsj2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 kH2s 7k lcmhdya8z5tz57z?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance om/fhz c;2ct w28jj-k xk(otpig:a80 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 ccc+kr 2ea0m zj*c/9 ceapacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of alp1:b onsi 59v 0.010-mF capacitor be 100 Wov1bpin5: 9 sl?

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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-v5)pu 9gab,zb mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W re s1;gtl;8z* :7o2mfhbqm.yndd2 9.m azzpjny sistance, 15.0 W inductive reactance, and 10.0 W capacitdb8.;:.nl9yf2omjy smzazg 7tqdz ;2hnp1*mive 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 resizd/:hl:gnn+spfxbso 9 oz 4(,stor, 20-mH coil, and 1.0-mF cgno xso,dsp :9f 4z/n:( b+zlhapacitor 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 c a:.8z8sbikc:ljc pkf/7fa . 100-W resistor, 20-mH coil, and 1.0-mF cap: cpbf7sz :ka8j8 icclk../af acitor 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 connected in series with a 20-mH inductor, m)+rw 63dddrhq pko 9ei gx*8jz1b(j( what is the impeq w(i1rhbd zdm)xd+g* r ejjpk9o 3(68dance 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 tgvx y pysb :*ju+t yu43699bavhe phase 9u4 y+ :avybby*p6gxv93tsju 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+q dkz. r)oi v2l*r 0s0gaya+ii74if n series circuit with a 20-mH coil and 1.0-mF capacitor f7g4 d.ilriiyqz r+2k oasf )vn*i0 0+aor a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series wit/jqbl*/ ev+nh6 xdw2vh a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 H d2/6bqhenwxvlv j*/+z?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 H s5 enpc ;9pyzj,*heo(z for a total im ecep,;(n *p jz9hoys5pedance 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 2je-6ne*3; ef ttf f5nyxq:wc be put in series with a 100-kW resistor at 1.0-MHz for a total impedance of 15wn eqt*f32efj 6c e5 nf-x;:yt0 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. What is thefv6:0upk/ )jyr j (jwa impedajkp0y:uafw 6 jr)v/( jnce 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-mF capacitor at 1.0 kHz for8 )wwcm/arzjgrdqymr 0c4 599 a total impedance of 45 W r ra9gwq0c4jy9/rd)5cw8mmz?

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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 16qd5q8lv5l5t3wh8 0 afgwnca+x c2vw.0 kHz for a phasvqqg5cvw6ac 88lf0h5 dn 3wx5awt2l+ e angle 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 a 30-W resistor at 1.0 6 5-i8bcvssddb p*/mokHz for a total impv8b-om/6 s pdcb5d *siedance 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 iq5ghw)/-mwq1f3 qypu td6,ro n series with a 100-mF capacitor at 120 Hz. What is the phayw-qwq5qom ,fg /uhp)31td 6 rse 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, 20-mH coil, and 1.9f zj cmn4;l8h0-mFhmf9cj zn4; l8 capacitor 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 ae) f cx:gz09oc 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power sup:g cxc0)z9o feply. 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 capacitou 3e 2h9 um/mr5gre,yyh.q.uqi6lj)mr of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in hjr y/ g2y) q93humm5u,li u .r6m.eeqseries 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 serie3fxmjbrvby84sb 4 +u(s RLC circuit containing a 50-W resistor, a 10-mF capacitor, anb44fbm8(bu3sx + ryjv d a 0.45-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 igtt l:57dasy0 n series with a 500-W resistor for a phase angle ot 7 g5l0at:ysdf $40^{\circ}$ 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.)u0zkj3s9 u/uvh5 u5s gq*fmn At what frequency sho9f5uq *)k5u0hu3vu z/ jsmng suld the circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15hzb anj rac);83(7zkvr+,y bt .0 W inductijkav,+b c rt38 nbyr)(zhaz;7ve reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuitv/vfj 0xy4r*2 f vz9 f,uk.maia:zm )j 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 no;mp 1+pl j;da resistance of 30 W. What is the power fa1;pm ;+j ndlopctor?

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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 containinge;uyk6 f9zp p/ a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz poweu6zp9e /y;pkf r 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 frequencyto1q 3xn9myd: 7ikgh ) of a 1.0-mF capacitor and a 15-mH coil in series?o kginy3x:mq1 h)d9 7t

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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 seri8qqsixua-8 h4/awsz ;es with a 4.7-mF capacitor for a resonant frequency of 10 kHz?q-h8 aqx ui4s8az s/w;

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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 resonant fr;cw7)7z6d7 tawhr e t rh+0ghtequencytrhcwrtwd7hg0)6e+h7 taz7 ; 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 place mkvej) ou+7*m 7svlw2d in series with a 30-W resistor and a 40-mH coio musj+7k)ev7vml 2 w*l if the resonant frequency of the circuit is to be 1000 Hz?

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