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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux eq/- kqi s7wuc8 8)qebmxcept

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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 n((lqc. rjssx;e*/y i 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 loop+ hdh+w((nv. k5rtf*g+ns m jas of wire in a coil produces what kind of change on th( +hshjm* kna+dfgrvn .+tw5(e 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 magnetic field through a loop of wire pv6vu):*g z . vmt tpvahqten 6b)+9kh0iu/n 0produces what kind of c qvh 6 tvuz 9n:/6p.bpae0m0hutt +))kgnvvi*hange 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 cmin+(l ei07wz hange on the indui+ mz(n 7wel0iced $emf$, 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 ws4hn+/2ww;ng xdh /d from a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conductor we y174/sj vhe2zqvhd 3ill be that which tends to producd vhq/342j1vs7 zh eeye 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 4yeb,pi *)k-luoa/ pc aa7/imflat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. Thc*l/7oieu)/ ,y-kpampia4ba e 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 magcrj 4 *nxi,3;a nm*8psjrhh,wnet is held above its center with its north pole pointing dorrnxjp4m;c i, wa,jh3h* *s8nwn, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic fq .nqwc1u.c)field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induq)wq1n.c ucf.ced 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 io6+ ouex6 mz//4btza-szt2 r magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field incrmr t6o6- 4szozzi+ /ax/ bteu2eases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the slm p)or ;pmr2k:4q 9faxj8+u magnetic field points straight down. The magnetic fieuf:4rp ;x2r)maqslm+8o9 j kp ld disappears suddenly. 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 liexuayhp d y5jt29,lx-2s on a horizontal table and carries an ever-increasing current northwa-x522dyjyah 9xp t ul,rd. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pcl5l ktlzp; 7714 r9kux.oaueole entering first. As the north pole enters the wire, the induced e7xllupkck.5uzt1 r97a;4olcurrent will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constanhavb s,wt-y-cmz/-7o t angular speed about an axis whose dic otz-b whm--,7y/sa vrection 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 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 4c7r wl 0r (v08yj; 75ids xmjsce2agyabout an axis whose direction can be varied. In a regiodx( jv0cma5wy 2l j 7ysc4rsr0e; i8g7n 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 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.nks g 4 c+vn6w*zjauj03q7js ;
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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 tha c, .gxi6vc i1mm)od-tt 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 fiy 5h0g+r n gl6da 1p1zuamk2k-xsl09 l sb39gyeld. 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) yiu;v 8kx.((wyw 7jwoxjvh-( is moved northward at const y ;w(-j. ivwk(vhjo7x u(8ywxant velocity through a magnetic 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 ,p8 gi6a5thup 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 generator5fcq ojk mz975 transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates thronoadqa sa1/u-6:dh;vioup/ lc z. +t8 ugh 60 revolutions each second. The frequency of tc;aa-hodpu8/t .qid:1vl u/6 so+nz ahe $emf$ 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 devien2g2um4ia p,n* sp3 un* m2btce 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 thatql5 x08n2o 6azk dbnq9dm e05ls* vg0l

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the c 3e;2aax ra,d* al*pmprimary coil then itel *2*a,aapd;xmcra 3 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 containba+n/1a :ik03 nslc lss more loops than the secondary coil then it is:n+n3i cb 1sk ala0s/l 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, thef7j sei);u+s a;q rhf. 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 resonan/s4: e0ibbk brt 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 connected in +a9huy mgx1,kg- j;hwrb *f7f series to an ideal battery of constant terminal voltage. At the moment cy 1;wjf*ar b mh-hukg+f7x g9,ontact 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 serie da08ld-8bs4 e:4jch ;p,u2ahrbs zv hdr;ie(s to an ideal battery of constant terminal voltage. At the moment contact is made-4 (hb,8epbu2sd8dac:4jvh;;za0li rr es h d with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is conn)(vdn 1qn,gn/j s.v sjqj/ k7gected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R iss/ 6i3yd4a z,q zl+scaw-qul3 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 s+ bolim31qsz1xje:v 5eries to a battery. The time constant for tois 1 5q v+jm1zl:e3bxhe circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. T9wm4g(c (7;wwyxysw xhe battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the cu 7 (cx;wxswygw(4m9wyrrent 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 u2+qlo,/rb vgcln/po: nits except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this civrcib8sg aw 9m3+vyu 0w28ym1rcuit, 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 supply. x rg0aha5a91b In this circuit, the curren1ha 9xb5gra0a 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 cxi/*i-*7vn wrny pt;:*hja kp a6w(eu ircuit changes by what factor when the frequency is e h / pipu( 6*nxaiw*y-*rw7tanv:kj; 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 voltar3 c1ngqs8qc/1 (kdv9ra9nyi ge across an inductor is doubled, the inductive reactance of that ind ni/ vnca9(1 8kqc3srrgy qd91uctor

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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 AC0wkv. npygv-7 voltage across an inductor approaches zero, the inductive reactanc k pwn.y0gvv7-e 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 this circuit, the cull* (knz,kd .grrenlk*g.,nd lkz( t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance+9 )nutknapa d5 oo5*nv 57nwg in an ac circuit changes by what factor when the frequency iok9pw a+t n ug7nn5anvd o55*)s 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 buo*qc(5a q3r up0u;1uicv e9capacitor approaches zero, the capacitive reactqvo5 a 1b;u p 39ru*u0eqicu(cance 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 voltages of the indut:rqc8z5o(7)u;qavh e, ;nxrx k 5ghq ctor and capacitor in a RLC 7zxng;hq) qa:u( cr, tvkxh;o5e 8r5qseries 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 anw,8kfd *;dgs7 xcvl;d rt8 4xxx//nk v RLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases ih0 gezh sfc 3u53ctb.4f R increases. When5use.3h4 cg0 zf3hcbt is 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 imp.yi yq:r9sxst 4(e0b sfr9ye+edance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedanws9t)n ,bs9ryce 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 capacitance bb*s/bdxp 8wz7bu+l) jnn3fz 8oth double in an LRC series circuit, the resonant frequency of that c x3d zbfp8lnj/b zwu)8*b+ n7sircuit 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.ghs9 5o4vm,f.+nbwy z 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 circuit occurs whenzq p56im ;rw 0lnxsbavopjqvl ;-,+.2

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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 un,v3rh- 4iusfield of 0.20 T. Fi-suuhr,3n iv4 nd the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m iso oe4n1kl5usoh x267q 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 magnetic field vector are perpendk26ln 5 7xoo4sheuqo 1icular.

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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 opd,hoi( k q),8y3oicp9uf -t in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic,)ypc, iup8d o h f-toi9o3(qk 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 an6bbsbeb29s*re ;0rqnn - (lde adjustable single 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 change 2wyol3sd /* n3wsa(xjs 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 ofy*vct6o+tebtar *-zk jk.k * )lwaw/3u sm4e2 wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0 l.k2stw +bk3vt aaw-/ te)r*y4 jeo*c6zmku* .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 witf/t2sumv5)h3lt o/lu r.(i n9k-cafrh 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 arp4*,w3bgby j7o p8:r x rnvc2xea $0.20 \; m^{2}$ 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 xvv4+wq) q0th- fwta. location where the downward component of the Earth's m a-ht .fvxtw4vw+qq0)agnetic 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 thvzjm k9tmo .97at is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axm 9k9t m7.jovzis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sec,ii m (i;i3lxctional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of acl3(yppb jsksf:3e5vwu5 qkh;c9z1;f )n mw4rea $0.090 \; m^{2}$ 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 4x xat6ctiih kh./xn050c. eg rectangular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform6/ t 5nt04.axic. 0ke ghixxch magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire ofau2x3,+p0:axmjykz s92d ngwc: r.4k wubk0h 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 1 :5 r8ti xwjdp.4nyjr:2 V maximum when rotated at 60 Hz. A mag. rwd:8 :tjinrj4pyx5netic 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 ge*wy/wl ;h55t6 ekzlje az,jm (nerator 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 of 6:1s qkjp1qf yjg(1 7fq.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 resistj7-ja maq5+ gkance of 6.00 W. The motor operates on 120 V AC, and when running q km7+aj-jag5at 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 connect(4 pmaha 8w;mbed to a 24-V power supply. The operating current is 1.0 A. What hapb4(a;wm m8 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 con7k,/ -z4xbw5pmu.d x (emr67lxavjf jnected to a 24-V power supply. The operating current is 1.0 A a6m b( -,drxu/al k4p7xjz fj5e 7vxw.mt 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 power supply)s*rv kfr *+ce+n kp;e. The operating current is +e r;f)k*ps v n+er*ck1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduch lt*a80i/j) ncz5c oye 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 thj 6(owt cet()xe secondary. How many turns are ie6 o)xwt( tj(cn 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 necess9o(eh.1dw ht jary in a 110-V primary if the 24-V secondary has 10he91w(ho t jd.0 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 eksl /h qq+(b8lkh q)2of a 500-turn primary coil and a 2000-turn secondary coil. If the current in l+ qlk8 h/)be(2hqskq 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 0l1 t8g yqzjip7ur;g5a transformer. Assuming 100% efficiency, how many amps;z5p lt7 0rigy1 ug8jq at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer providb.pz: p r50zj(r *f)nj.v vokoxqam5, es 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primarynfp)pb . va*z vrjkm z5 (j.oqr0x5o:, 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 tf*c1w(x* t lwfk+0 suhurns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secow0chxf wsu(** k+tf1 lndary?

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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 onz;yn(njyo a+7 its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what yo(j7y+na ;nz current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns a/5k-j)z6dv(qh u sjxq4 6 e.w5fpljg tnd its secondary has 200 turns. If the input current at the primary is 100 A, we cang4htq uj/ezsqjd wk6vx-56 j.f5 lp) ( expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tu immcfk5i ( +acou(f67rns. If the input volt7 ifc5o( 6 fka(uicmm+age 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 transform j 6adp6x9rb,cer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional 6xc,d6r9 apjb 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 9,2zj9 93gahxn+qk do8rcxpgbb2i 7m9do r;a voltage is usually stepped up to 4500 V by a transformer and to8o,z7 b x hp+n9m2kri; ad29 db9g3rqj9cg xaransmitted through a power line of 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 voltagek:nt2 vvx wh+hsiv g,w 68a5e/ 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 th v8av 2v/ns:tw+k5ig6w hehx, e 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 ,oilq8 (lzs 9x;jqq 5l120 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. F9(qi8x5qjll; , zoqlsind 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 total resistance of 0.60 W. A gwne.g4yff6/g*cp chf,tku9 h,:/ c r 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 transf/p*cce9tfwg c/ h,fy:g46 gnfh,rk u.ormer 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 hzn8+b)+mro dj1w iu7 gas 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 i7dw+1+mjg8)b oru zins stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power wo ouc4+.l *z .tfzrgrq9wxa v/2uld be lost if the power were transmitted at 3x/ouvzt*9w 4lfrqg. r a .c2+z000 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 cww c+g1gur+1b3iw )2a cqj8rA. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power b+r jgqwcargic18)u3w+ 2 1wc?

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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 25ma4bo 2:lq r.bed v(pdvbqp:.h-al of 5.0 A. How much energy is stored in the coil's magn.obh2apreb:v2( :v.5pal d q -bql md4etic 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 6.0-0h qxj 914rnjz6(- t dr;zbvtoW resistor and an 18-H inductor. What is this cir6z rdv1;nqzx o4t09rh -jj(t bcuit'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 qte lof n1; xl3n3f3i5v3n1oy in an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is thes1n)fh) g5g;ys 17t ud(kpplt 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 zz9n 5m t+*i;ulpvpl) is the resistance of the la +vu zpt5 llz9i*mn;p)mp?

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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 rq4t4v)p(dof 120-V ac power supply. What is the peak current through the r)qpfo4v4(r d tesistor?

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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. W-gu- ii )n *r8zoj4dvz4fx+qshat is the power dissiqog4-8 -izf*vzj4i+d )usrxn pated in the 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-bn m3kqi7i(q0b nn* ,dohao/x1/h9mk 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-W c7ho9bq2f u,y wneij,06lql5 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 resistor is a.me siao122v; 1hjpd $I = 0.80 \sin (240 t)$. 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 inductorqevb/r3,v h+bakp7- o at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil aqit u( *l;bx2et 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reactan5k q,n 5z47ufqd tam,mce?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 1000 Hz?t8h( l tgan1x0

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 k )u5gv/ ssmah iuy+b0/Hz is applied 0b/u) as ys/+ mg5vhuito 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 ;uonswk* .ea2)h lswl 6ad;t2e ;cv. bcoil 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 capacitiv:thu5s(qb5sm (gaie ,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 capacitive reljg add78(ic 8( arv2eactance 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 reactance of 120ezm/-l mc/ lq00 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 reacta ltbavr; :uo79nce of a 0.010-mF capacitor be 100 W?;9vtb:au lro 7

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz andf .hz :2r nljdazc(()k 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 resistancenr*-,b u3fs3is8e kqjj):obl, 15.0 W indojr*lsuq:3)k nj3,eibb f8-s uctive reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if af *wwqu2 ,ak0p 100-W resistor, 20-mH coil, and 1.0-mF capacitor a 2up0, w*qfkware connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, a5*0oc4e wwej33zwr o and 1.0-mF capacitor are connected in series0rwaw3zc*je 35oe wo 4?

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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 ibmtof(2cw-j * s connected in series with a 20-mH inductor, what is the impedance fo*bc( wm-tj2 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 .vwo8:rn p 2ztinductor, what is the phase a.zvop wn :rt82ngle 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 ii 6na5p-biaaxs/sw *y: ed8v 0n a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 15w-a:ai6dx vns8 pi*e0sba y/00 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is nee;clx ni*0 ;vrbmtjgt*;vm/ d0ded in series with a 100-W resistor and 15-mH coil to get a total imp;n0jvg* bl it*/;;0mdcmtvr xedance 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 7:j qedx d p4.yv: .6m1shd5zswqfo4lin series with a 450-mH inductor at 5000 Hz for a total impedanceexj hd :..q6dw5 m17vs4poqsyl f :d4z of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for xfv):j el a2o6ik5 g izc.(vvyes65y5a total i k) g5yl2 ix(vyee o.i5zv5aj6f6:scvmpedance 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-j,evx 9e* :mv ylqhogb9 +1u5kmF capacitor. What is the impedan, lvbmu9vxkeh19 j* oy+e:q5gce 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 neoe +dmi* e,xo;eded in series with a 10-mF capacitor at 1.0 kHz for a total impedance of 45 *ie, +m oox;edW?

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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 ya09kb4t3 9x m klxdd0capacitor at 1.0 kHz for a phase angle 0a klx dt4ym x9kd903bof $40^{\circ}$?

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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 ser8 ( fwhm;xxsv3ies with a 30-W resistor at 1.0 kHz for a total i( h83;fv sxwmxmpedance 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 capack*k h:zrk7yau 37)nwc ht--zuitor at 120 Hz. What is the phase angleu 3)knu7- * rc7hka:tzzh-ykw?

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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 res ( a5qu96xtpy cwx6-obistor, 20-mH coil, and 1.0-mF ca xp9t-56bwoxyca(qu6pacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-Wx13 gid) xb+hr1o kmk( resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hb+ix(3o)d 1rm1khx kgz 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 capacitive reactance 30 W,ckoq7t +n :z3l and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flow o3k7tl+:nq czs 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 coe3e7hpnb/ms)6vx :mt 4mxn 2 s-*tevjntaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H in-64txen tbj mn)vee *7/ :ms2vs xmhp3ductor, 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 cf*uvf 43c82igt -ksgwith a 500-W resistor for a phase angle ofu3gcftfci-*v 48s g2k $40^{\circ}$ 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 = acgt5v - zi2d2200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum pow zg -25cdva2tier 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 se3e )q 6 o3sk0odlav5deries circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-al edek3q6o50dvo) s 3V 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 circuld :aa,y ri7+ 3z:b2x;jrqizk it 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 g)ve2ct 4,d- rpeq/ur of 60 W and a resistance of 30 W. What is the p 2vc/)erqepg ,urtd -4ower 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 resisto;ce0m h+w*s2k 4m qgyar, a we 42gs mq0ky cm+;*ah10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in ser27ccn*gi2awx1) xd(nw )awt aies?( 1aawdc 22 ix*gt)ncna) wx7w

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resonant flx49o udh,i -m;p*fw hrequency owofph*;,d9mx-l u 4h if 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 need.d iynw:hfi ,e )+ja)fed in series with a 3.7-mH inductor for a resonant frequency of 10 +fhif )d.j:we,ia n)y00 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 mu u0m(ek d,4cgalatjp, i;- lx5st be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequen5l;ek-0,xum(a ct, i4ga dpj lcy of the circuit is to be 1000 Hz?

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