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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are unf* j33b2gdmkqf 1z h7v;kd2pbits 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 induction states that th3(lf 4n 6ijprdoht(r2e $emf$ 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 ol5 9nb/f,xrzc f loops of wire in a coil produces what kind of change on the inducedfbzlr /xc5n9, $emf$, 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 ofy,a:vjlx h6q9 the magnetic field through a loop of wire produces what kind of ch,9q 6h:l yjvxaange 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 loii ;: g/+ztdhzop of wire produces what kind of change on the inducedigd:hz; +izt/ $emf$, 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 fie6 goyavd/2;8nixci :eld 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 a25.i 8svlqc0d qcy8q f conductor will be that which teniy cd l2cqfsvq8.058qds to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet i+w90u pmiqso3jgt26d s held above its center m0gi9 3 uqjpo+s 2tdw6with its north pole 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 fl y78y (n3erw75i-gh.qprkvu tat on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it au 3tqr7 5ky- h7g8pe iyrnw(.vpproaches 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 wherelyd*kio ,(n5c the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil asc,y *5klo( ind 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 apz xfrvfu1dn4 /-5(j)xg7 zm8 cc y+qo region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induce-r x vm(xc 5qj/z8n71z4 pf foc+yug)dd 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 in31ko8 n, c)e a9hzbafkt;f*yr a region where the magnetic field points straight down. The magnetic field disappears sud), o13 ak9zy;fhrf* ka8bt ncedenly. 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 wirezz4egvx w+ h q2n k-l53z)m3qh lies on a horizontal table and carries an ever-increasing current northward. Two coils of wire liz34qg 2k5hzmvn3wqx h+zl )e-e 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 nor9c.v*rwgy 96)zfs eha th pole entering first. As the north pole enters the wire, the induced current will be (as viewed from above)e f 9gyzwcr* va.9sh6)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speefz y7da*:l0e jd about an axis whose direction can0*ldayfz 7je: 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 the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whose a74chyoah0.q direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation ofcqh h.a4oa07 y the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.wwk2zwp/ou (s/s(8otpo, eh /
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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 thato1axcy 8c8m w; 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 km*7ds/ kgcrb y lj3nda x(1k-4 )*finfield. 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-weszj tqtuor yg zwsf2*ga k1-(y4o*-.a(t direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acrosya.o((q1z* ugtr oy*s-k-4jg2fztw a s 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 angular vml*q9 2tha. fa*zst. selocity $\omega$ 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 transformov6znk0:l c+d(4v*(kzz/r6zdo cn o rs

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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 eac je-hz3 ey +f ovd4xwrx.2xyma1-/d. zh second. The frequency of th3/rjv1x4owd-mh + y2yxf-ze.. d az xee $emf$ 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 devn,ki;a6p;oq08fav 5tg(cg r nice 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 devicex3cq3lxd2fbx: 6 j:ay that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coilh;.k ot4i e9j7hp bw1w contains more loops than the primary coil t hh4e; tkw.bpw17 9oijhen 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 containsm8v.:g b 9rdeb more loops than the secondary coil teb:brmgdv. 8 9hen 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 powel+.e; ia0nhinn c)u 2tr 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,pkunq tv- 00m(

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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 anp w8vmjga2+9( oq9d6vr8s4pzxq *z ko ideal battery of constant terminal voltage. At the moment contact is made with the bx4 o6vp2+m8vwo9(q d8*rp gsjzq 9zakattery, 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 cdnn7 j v5d9,joonnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage nd7j9n ,vdoj5across 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 5u5gi6oi1 2ra s2z8wqs tb(d p0w+k pland resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inducuy4p. ba f b24lwt f3sir8e+p.tance 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 connected in series to a battery. The time colu ; 2if. +,ssttbq3dwnstant for the circuit represents t l.3is;+2,fdubtwq s the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected sm 5i4k //0q zvvqa4o+r.f x25bpdoak in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents thez.qv5m4k qok0 4sx afp i+vodr/52/ab 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 un36q -ytaa6r5 ago ay3c ;f,jzwits 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 connecs* s3vhg fl0u+ted to an AC power supply. 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 connected to an AC powe)ip05zma8. kj;oe 4; t noohnur supply. In this circuit, the curreno 4oohe5nkn ).;tz0a8;umjpi t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the frequenv )m(uuzfu x ht qcj03z)s+t 5,)gfwt1cy is tfv+,5q w)tuh0zx ft)cg (jzs 3u1 t)muripled?

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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 inductivevcw7z kv5//u r rec/7 v /5uzkvwractance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, tjozj z y0w0;atdh6* jb1-)p aghe inductiveht1 z;owjj*bag ay0djzp- 60) reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In th+re+yfmqhv 6/ is circuit, the currenyf+hr+e mq/v 6t

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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 xesae52ab -hb u;y;; v3r-tazby what factor when the frequency is triz- ys;ba vht3a5- ; eura2;xebpled?

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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 acrozmno c-u40m 6fss a capacitor approaches zero, the capacitive reactncmm4-o 0 6zufance 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 betwt9fw8f(d3i c+gb )m zpeen the voltages of the inductor and capacitor in a RLC seriebw+)3dfi 9(f8gp ctzm s 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 istgl.*w+ 1 anl)ctf75 khb: myf defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuitomtfcg7d .+4 d increases if R increases. When is this state t4o+dgm7c. fdment 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 th alh78iwlbu;(syq*(t e 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 series0t31 7fcr gmep circuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the cam a7q62 uchph42t2 49lzph e1zttr;r gpacitance both double in an LRC series circuit, the resl7ph;4ttr4a 2rh62p zzehm c2qu tg19onant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At resonance.qkpbb5d/stu2db2 pjqrjc 4 n 9z082 c,

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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 8e0z1vcgl .9c ue)flze-g (wf.ta0xo 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 magnetic yq ltg.5ozn is.-ru,2 ff f:1ru ;or:sfield of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetiu:r.o fznsrti sy1;g fqruf:ol -2, 5.c 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 0.1h 9rhiw0)9mo v0 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the mag0rim9 wvho 9)hnetic 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 radiz-uhf7ay u6jgv,4pf,op b-3 p us 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loopua- pyjf -3z4gh,,u fv6p7opb 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 singl2-5ivsa d) y.y2himuc4tvkusw)+ze3e 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 changes fros-6 )x8 zpwa ghty4giececg8;zy-*z0m $4.0 \times 10^{-5} \; Wb$ 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 w) i-n( pgmc6d juwtyp7q /x7u5ith sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find theu65) txp g( mu-yn7jp/ q7wdic 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 /29h lsl qt(m*.fk jlb:k-vpviss5*() kge sj15 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 a8 vs;v 1n+aetef .jydda)7rx9nd 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 horizontally at a location1 ;ocemqt3qp+n(jf 9b where the downwar+ qmeon ft9j; c3p(bq1d component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angulef0uw -xh6xc3p )h3rqar velocity of3exhc q)x pu -036rwhf 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 5)7pr6s8*mabsu9d m3zx/a x j o0 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 jn15 jp0na736 qmfzo9 ;z oosdof 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 itso qim+3* irvf5 armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axisr*ovf q3+i5im 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 ofj90sqd 4pawy,gj t4 *n;1atn m 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 ejtmb y0770qr fx/6/t ;f bcazV maximum when rotated at 60 Hz. A magnetic field of 0.050 T isb7ejyf/;at/ tb mzc0r7q06x f 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 pto vb:r4z*al8 1n/*1degr dpwith a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 Ws2,qln6 ; rcii. 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. Th2vxuw oo85wv1e motor operates on 120 V AC, and w2vv u 15wwx8oohen 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 rt2g ugz12lwq.esistance 6.0 W is connected to a 24-V power supply. The operating curu g1w2q.tlz 2grent is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. i/ b hsqh.fb1/vv/qy7The bq//sv h. vbhqi 7y/f1operating 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 resis.wsq3b, any-u(n ,y hftance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the bacy - n.yu,hwasq3nfb( ,k $emf$ 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 needu)3 l:m7z8u sf 2ghn5 qb6zbesed 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 causesm *lihm(3 wz.b 14 A to flow in the secondary. How ma3*lh(mm. wb izny turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns arfy6f g1 :yxp6ce necessary in a 110-V primary if the 24-V secondary h66f 1gf pcy:xyas 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 consismd8wvw3nrgjc 8/wv6 -ts of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, c w6wvg nv3mjw 8-/8rdwhat 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 c7yhu efol+,ugq1m;- oa4 4svof a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in tcsmuool gvf yq;47 4 +-huae1,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 provides 7500 V at 10.0 mA. Thef+/ vkn/wmv. b primary coil operates on 120 V. Wh/v+nbv fk/.wmat 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 primar5hy qd 0h;dpauf b08j)01zrcjy coil and 300 turns on its secondary coil. If 120 V at 2.0 A is apppy0 0q 0b adjhf)uh; 15jz8drclied 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 coil and 300 turns on its sa qvb:h ujf,75econdary coil. If 120 V at 2.0 A is applied to the primary, what current is present in 7,ju:5fvhq b athe 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 transfor c1v0q t+2m pq. qk.c +zsig5opd3qw*shtrz2:mer has 100 turns and its secondary has 200 turns. If the input curt c02rzs5mqs3qz:o p2idp..vk qq+gw+*tc1 hrent at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns(v g /lv4vh2xk and its secondary has 200 turns. If the inpuxlvv4 2k(vgh/ t voltage to the primary is 100 V, we can expect 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 haz-0hmoi68fi *nv 0qr ds 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expezh0-mr* odnvi8 qf i60ct 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 usuatah 0syxqg+du km;a/ x91v/p+lly stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns ip+0sa q/x+ tu1;y/vm9xgh akdn 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 voltage is usually stepper ye:*8cavi/z d up to 4500 V by a transformer and transmitted through a poweer:/ay icz* 8vr 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 eq2mfib.rp2u; u((lq of current at 120 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 lost in the trqp.u(mi 2;f 2(rbulqe ansmission 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 ue- 0 kuuv6ye550 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 sk u veu-y50u6etepped 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 linbas6 );cakh *opp -l5me 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 turn bh pa6am *ops)cl-k;5s 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 ey)*vxaphbz) gy41s 7V. How much less power would be lost if the power were transmey1 zg)4*v7xpyhs)a b itted 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 transm8h-e ml*x9e gpitted on a line with resistance of 0.60 W. To what voltage must the generator output be steppedhe- ge9lx8 m*p 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 51 xu. ozlnor96k)v b0 gszgz5hicz 80in the coil's magnetic 1obr6g050zis gv 58h nkoz)z.lzc9u xfield?

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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 cu9 kl gde/5yi2wpe1*a, eu9ho5m4qdmontains a 6.0-W resistor and an 18-H inductor. What is this circuit's time constan*g upde1,m29 5wa5yqi9eh 4 k/l duoemt?

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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 rqrkic: k/.cnmy e/n pv u+ 68godo8/3wms 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 cur f* l jnq:;tj5q ht(x47bhigg+rent?

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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 outw ir+aag9a 8f-ltf *nd-,qsr+let. What is the resistance of the la- t r9al a-rd* g+,+aqnswffi8mp?

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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 tox; mejz g()6;3yizk 9 lu6vquu a 120-V ac power supply. What is the peak current thzmv69y z6 )u ulek ;;ij(3xugqrough the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What rr3 zfa 3f(-en /o6mzb,acxl2is the power dissipated in the resist,2c63azfb/a3- e r( nmxfzloror?

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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 p jtgwk):*4lz $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor 75v.gnjje7ykq 0h* ys 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 j 7dtw)fpznba1a*11l/+gn wu-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 60 Hz?w /02cc gzw2ji

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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 .()((bjs2 0r kvzg ci*39yln sqbufzm reactance 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 co* yqym )sgm,spr 6wh6+il 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 reactaxis v;wcmr q 7w-8iecx1iwv 1r.,g.k-nce at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency oqibmh,jr i,)k+ms t+8+::l ti/scwfhf 20 kHz is aph+8sl+,cq:+w:t,bh i jm skri)itf m/plied 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 1q,ytbl, uw a07 2gcjby4gz k*9:d7rfv10-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 c eci4do;m-/ ev4ll*pad-4rxof 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 of4hkj+qrmgm 1p7 bv4q 4 capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reayta9 us8jt:)75vapb i0 x+xeyctance 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 reacq5(3x:b+ -mfhf hioiktance of a 0.010-mF capacitor be 100 W?3i fbxhho5+k -m(f:qi

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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 qn3nhob ;dr ,+ svj:,ywk58ku5jr r.pa 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistanwowm;v muxu 41-to7sxi7p 4j;y/r*yk ce, 15.0 W inductive reactank ix7 v*-t4; y oj ;uws7up/mmx4y1wroce, 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 zyil py8) z/5bat 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriyzb5 8y/) zlipes?

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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 resistor0ql9 c* izazmb37z r5b, 20-mH coil, and 1.0-mF capacitor are conzb7cq 0zl*5 izrb39manected 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 congr xj(:f qc91cnected in series with a 20-mH inductor, what is the impedance at 100 :crcq1fgx9 (j0 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-y1avnvbo*wijn9 wp0 u6hf6 61mH inductor, what is the phase angle at 1001096jniy*p ov w6vfu61wahb n0 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 serie,x9l6l3whwi ns circuit with a 20-mH coil and 1.0-mF capacitor for a thixw ll3 6wn9,otal 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 capacitk f6-s1:iivy dances is needed in series with a 100-W resistor and 15-mH coil to get a total impedanc:6k y1s-vif ide 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-mH inductz97b sw w7gk*yor at 5000 Hz for a total impedance owsy7 bkzg7 9*wf 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series wi8f*+jgt7k ji+u jti0l th a 100-kW resistor at 1.0-MHz for a total impj8*0 lijifut+gkt+ 7 jedance 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. What is the impe 8muna ca31pg9dance at 1p8g ma nu931ca000 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 for a t ordh*+-0h tyvotal iyh*+to0 dvr-hmpedance 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 wit+ u( zqzn2) -cgv6j;ymiyk;whh a 10-mF capacitor at 1.0 kHz for a phasei;z uk-g (6wqc hv+;y2zn) myj 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 1.1imp4hk4b3 kq 0 kHz for a total impedancqpb4i14km3 k he of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at3kthy bu 6.2t6nu ol31lk2ut o 120 Hz. What is the phase atu ko62yt3t kln1u.o6 u h3b2lngle?

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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 t rpi*x(bo k(4 id7.pqikgw,+if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connecte7 *(4g pw ri+okiq,dtk .xi(pbd 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 a():p/bp/d byz rgl; cl 0.350-H inductor. The circuit is connected togb/zdr)py :lpl(c; /b a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of 9k+ig;m 6qpqgl1o7n2zs6ut . dim8xycapacitive reactance 30 W, and an inductor of inductive reactance 30 W are connm k9 n1 67+igxgpd.tsz68o yqlim ;2uqected 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 containing a 50 / j5o,mx/bn ,mc9mg.lkb( mxy-W resistor, a 10-mbn5mb./ g,yo9(jx kx mlmc ,/mF capacitor, and 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 in series with a 500-W resistor for a phap6tzjs 1/5og qse angle of1 q6/gsj pzo5t $40^{\circ}$ 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 Rn/p: rli*2 klbsk9i xd s6f+v5 = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to hs5lsp :vb+* 9 klkx2n/6fdii rave 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 acx7iigkk q8 iwa7 gm19* series circuit with 12.0 W resistance, 15.0 W inductive reactance,7agk 1*i i gwk78q9ixm 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 Azeb/8)5u p +i2aadt65ca / yduyes5 i7o7k kxmC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. W6c1 liey s/16vjo bw,uhat is bl6c s vy,1j6iw1/uoe the power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W rer:vf3 *se: gpwsistor, a 10-mF capacitor, and a 0.45-H inductor, when connected tgpfevw *:3rs :o 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 capacitorm ,/e+ c1rykom and a 15-mH coil in series?rc1+/koem, ym

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is nee/s 1grj+ws se z7vi3o2op:3yk ded in series with a 4.7-mF capacitor for a resonant frequency osi7wszp 33y v/ges+r12o:jk 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(,vn.qvt j( rb 3.7-mH inductor for a resonant frequency onj vb.(v(qt ,rf 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 resistor and a jshf5n o35/2zo1 sfzw40-mH coil if the resonant frequency of the cwfoz53 2 zj1hsfs5on/ircuit is to be 1000 Hz?

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