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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 una6 m )d)anw7gfits 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 2a)1bca9 8gm t*dt)2 bleukyu 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 loopjs2a3j :r bjyjn1c5 h3s of wire in a coil produces what kind of change on thh 1325ynjj sbr3 a:jjce 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 2 ,wnht d8wv br(nh:a7the magnetic field through a loop of wire produces what kind of change on the i wv:ha,n 7(r8 twnb2hdnduced $emf$, 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 lu4-1 cd9s-d d1fdefqy oop of wire produces what kind of change on the induced ueqf ddd- d 4-19scyf1$emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field an iu;f 4je,(z eu/y7stujciw 2;3n)hez$emf$ 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 directt 7ybun8ba(9jion of an induced current in a conductor will be that which ten(bb9na t87uyj ds 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 (4g *fks6ex65wbe fc hbar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from aboxb6cks6w5f(gh4 f *ee ve)

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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 0 - p7wqvj97oi6g wr*uibie,sflat on a horizontal table. A bar magnet is held above its center with its north pole pointing downsi7jw*p-iu goverwb,7q 06 i9, 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 y4xk1dvzk x1f, :ls nj:b4nm8table top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. Wheb4kv f1mny:kzx xj ,d1l:n4s8n viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a leve8r :g8mph6i8gp2ysma l table top in a region where the magnetic field vector point8a8gprp2 6h8m:my i sgs 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 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 i/2a;qwoen 3gtop in a region where the magnetic field points straigea qw /;ion23ght down. The magnetic field 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 lies on a horizontal ta;b 5u,b, amyp)y +jdjwkdh71kble and carries an ever-increasing current northward. Two coils of wire lie flat on the table, o7 kbujbw5py;a ,1d m+ dkhj,)yne 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 yacg* lrk/.7kvv9 j-rvm 3nk1pole entering first. As the north pole enters the wire, the induced current will be (as viewed from anrvcj79gky*- 1 3mr klvakv./bove)

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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 rotawjzqy,(a*9y1y bypva/zl 9x ,ted at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rova(q/*,jz9ab z ypwy ,x9 lyy1tation 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 wiref( .bl3ie;ddc o 2)bcixsf48g is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orient ()ci8f fs2i b;3l cdx.goebd4ation 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.us3.5 qwuxu( n no4 dzx*e).kg
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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 +4)rm*dlgl bxt 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 magnetizgs42ivn8+. bc1kn(/ 3tjo 2 qjazu njc field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direcblbn*ur8 dir)3y) i *btion) is moved northward at constant velocity through a magnetic field that poindir) *3l8*bu br)ybints 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 re ozo8 n)tdt/qit563 4g fm5xangular 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 transeqit dc*.x l6der /oh z8z9bffe85h, :forms

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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 refa8 fo7*e wxgcx: iu,2volutions each second. The frequency of to7icxe:g*fau8 ,2 fw xhe $emf$ 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 usj2)xuuo6k h. 4u zmwx(ed 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 tha 1 rcau-urv7zj2vt6e 7t

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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 primb-vi0m*r a(mm(js *w hary coil the*sw 0-bma(mv ihrmj( *n 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 contains more loops th;xu jmo0l (4kaan the secondary coil then it is; xo0j4lk(m ua 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 pl-2,rewwr htdj..vui4f/ fqlx7 w ,n6ower 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 circg. z/blw7c3rq 9p/nat e( 8vzkuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an p2tzsy fk9of z8t/*4 cideal battery of constant terminal voltag9f/8 tozfzc2* 4ksypt e. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected u4baeu61pc9 qin series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage 4c bp69qe1 uauacross 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 Rxcd(z )14; bkwl oj+ury +8imi 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 L and resisty hja4cl + wr0q:6vgk1ance 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 seri e efl.1f7xdijg2l)1t+wd 8dqes to a battery. The time constant for the circuit represents t. f8l)e7teix1 2d+ lf dw1dqjghe 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 smqffo *f b5s1b3p v4ep0z:-a ceries to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrbmaof5evzcfq *01s:4 pf3b p -ease 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 exce2ykv n 1hok n4+encdh62qjg7rxgu6 - /pt:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connectedl5,*f y;ktadbfq1 ox7 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 power s 0fn rtj;by/;kupply. In this circuit, the currenty/b;f;jrnt 0k

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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 wh+ v 4bx3rdsaz+en the frequency is tria z+r43bd+x svpled?

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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 isbokv 15*c8 4eef 3 ill2wsfiq: doubled, the inductive reactance of that inducto5 q4efofil b:vs2i3we *81 cklr

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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 indugf2a a.vyvm67 ctor approaches zero, the inductive reactan6mv2 vf ay.7gace 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 connecg: ixmqt b)/5.gsqk6w ted to an AC power supply. In this circuit, the current5.mg itq / qs)kgw6x:b

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactancroxop7 9q8z9r e in an ac circuit changes by what factor when the frequen8q9z 9x7 rropocy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage v iw09kaxb u/sqwjk.cw8;z( .across a capacitor approaches zero, the capacitive reactance of that cxkqiskcjww/8b;v .0w9( .zauapacitor

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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 voltageo8iav9k /w 4/voh u-qws of the inductor and capacitor in a RLC series circuv ukwav4-o9//w8iohq it?

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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 d)jzz8+1avs 6lzu r1rt*dib- nefined 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 inc:ld20z9mx2erdwk u2-9yl j mureases if R increases. Whenrlj2:um2el dduxy09m - k2z w9 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 circuitb9bhsgd m3g)cj28f:c :s*vs s. The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit incr7 ln*-z unfmfkpl oc417gc*:jeases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series cifu; pfpo 1w4 jvd5x*9*ie+ kaercuit, the reso;feejop5+1iw*apd49k x uv *fnant 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 q/fq.er jd moc;os6: 7that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit ocs ulr6 p7nxxn95 o5m0ccurs 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 mnlj;h: v94ht(dlr b (m is rotating in a uniform magnetic field of 0.20 T. Find (9 lrn 4 hd:lhbv;mtj(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 is zw4gwsdx /*8n noe g2:rotating in a uniform magnetic field of 0.20 T. Finzwx2ggdn*e s 4/: 8wond the magnetic flux through the loop 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 radiusf-st3 eb n;e,rzt 8zz, 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic 8etezt3r,;, zf-nb zsflux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single lon v6rx9 kjv*3vop 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 froe7 jw - z8o.wpos*j(qtm $4.0 \times 10^{-5} \; Wb$ 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 fra6 gjbd-brp9he3 4 qi8hme with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50dgh 9-8bq6 ri3phbj4e T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 tvb g1k+, u bga4*y7bn:ixj v-eurns 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 area-pln ezkf2g6 8 $0.20 \; m^{2}$ 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 spw5l4c/nh jp5can of 60 m flies horizontally at a location where the downwa545 pclnj/wchrd 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 constas 6 k)fwx itl t381du:2vb .i.t)h sx3wuft2xint angular velocity of 2.0 rad/s about a vertical axis through i.6 u1t)xisf3) 3htlwvx :8w bdfkstx. u2i2tone 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-sectional area*pr qvco5 ,,w doyq+/j 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 16narae9cnp)wmj, flgx;83 l+f0 * lk e00 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 lg ywq9 8av5p+k/ rjly.h ;;bjvoop is 12 cm long andgkja.bvy; p5yj9;8rv/ q wl+h 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum 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 w cartdxxkbg :5a9/s5 4ire 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 wi uu98bopcl98r th an output of 12 V maximum when rotated at 60 Hz. A upc lu89o9br 8magnetic 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 with a 8 ,oioh0pt7x ymaximum $emf$ 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 W. The motorfn+s53ao he:4um) oxt 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 ozbe pa/69q. jcf 6.00 W. The motor operates on 120ae. j9/pq6cbz V AC, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24v+d786o q2ku cn(xifd-V power supply. The operating current is 1.0 A. What is the start-up curoi2vfcu8 nkd6d7 x+(qrent?

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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 Wv+ r5n7na gb4i is connected to a 24-V power supply. The operating current is 1.0 A at full speed. r+75 bia4gv nn 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 conn o 0)j44h qp4vhhlobf-pkf ,.qected to a 24-V power supply. The v4bp4.4hhj,op -lfq qok) 0h foperating current is 1.0 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 transforme1 s,yxqguk;u:r is needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the secfclq5 q +opan:ca61 m;+plle,ondary. How p;a+ +e 1 6qac:5cmllqolnpf,many 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 are necessary in a 110-V primary if the pmmyhu3;m-tv7 vkd;8r)cq. t 24-V secondary has 1 )c.-8vtdvu p;rk;73hmmtymq00 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn sechbtff6xuga*2q k +:*d ondary coil. If the current in the secondary is 3.0 A, what is the current in the pd6h x+uatkfb :* f2q*grimary?

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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 zn vy+n+,c4y h xv20e ab/ :(w)rpybvvin the primary of a transformer. Assuming 100% efficiency, how p+ycba zh: + vn0xv),n ywvyvb2(re/4many amps 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 provides 7500 V at 1c.oi ms lku7i*l/t;:a0.0 mA. The pr l aotu*/.cil:s;7im kimary coil operates 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 coil and 300 turns -xv n .yc47o4t a 8t9a(apc-qfby4wif on its secondary coil. If 120 V at 2.0 A is applied to th cynit4f-qc(av. 48a xa49yw-tpof7b e 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 hl 74i0zwfq1oo: n5jji as 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primarfwn7j05ojz ioliq: 41y, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns a:1fc/o5oli 8ablk.0r mb( v,z r 8ltavnd its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at85v b/8:rbz,1o0v tmcfll r(aolai. k 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 turns. Iftpw( 2p5h f)n8 yuw,mi the input voltage to the primary is 100 V, we can expect the output voltag2w mf8pt,)phny5wu( ie of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns.,rf)ls5 ;gu(7jxc x lh If the power input to the primary is 100 W, we can expect the power output of the se57 ll j,uf(cs)x;x rhgcondary 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 u7nttls(jcyh3 ;3nzkv3 51sog sually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Fzycn13s3 hotn 5t3vg(j7;k lsind 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 voltage is usually steppsg+f lqhn861kln5ti nt)0sp t 38d t2ved up to 4500 V by ad+0 if5nsg s lq ht)2t8ln13nt kt86pv transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A ox:ro(x4iq /7(qz8fkk,p s sbebs6p5df 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 transmission line i5osqqp4ib6(p,( k efx d8 sszrk7/xb: f 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 totalkaq.7k7u8n dm4) xs ij resistance of 0.60 W. A generator producexk8 iqa4usd 7k.jm)n 7s 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total req1+. 0rcx izvjsistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformzicrx j1+.vq0 er 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 labcnvxo;jkg(4, -n k x9x+k0se di5x,ine at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of asd,v+b-5kj;( 0ox9,ekc4 xanxkig nx t 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 genec+1n b sa2l )zkjv+c)srator is 440 V at 20 A. 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 )j2 )na1ks cclvs+ z+ba 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 energ)yx; za zjvia-3*xuy3y is stored in the coil's ma y-3zx jv; y*uiax3z)agnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. What is- 9wx21e gqvng this circuit's tq 1xg-9gne 2vwime constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the: as8tkz.jv2m 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 t w(qvm/zwv rw d 0xb8)a*(az,into a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placebw1,26 +ry.p2 ohdv wil:svjwa.cz p)d into a 120-V AC outlet. What is the resistance of the lamph.wlz2jp12rwp va,.ob +:c6wd)ysv i ?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac pqc .vedd0hw9md (f8q8ower supply. What is the peak current thr.w0h v8c8f d( 9mdedqqough 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-ifq 2z/ d laee/j2g g*a9vvh*:V ac power supply. What is the power dissipated in the ef2:/* a2/ia9dlvhejzg gqv* resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resis)i) kr+jcy; tgtor 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 resi4l kqm6hub- d(j3mp x3stor 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 huo 5 s)r:.nula 50-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 reactancwv513v y-lk w6 iz7zqpe of a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1000 2tpz*as-jtmuy, eq ll6s; m5c9: 9nrxHz?

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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 realf,tm.d ) gk:actance?

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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 1gt.2ery d wc19000 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 cctu0 m+sunf2)v,qu;;efejeoi s0 (5 of 20 kHz is applied tuj;s (oqft5v)e0nsuu0i 2m c,;+ eecfo 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 1cl301xeq2 m pt10-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 ofni5)( h bxuu:z 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 reactance at 10 kHz?;63p8vh msppr

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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 x;,* dnn cpqp: dlg4yw(h4rp;obq5e4capacitor 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 -mv7nv: 4)4mihmvqnrn. m s.sreactance of a 0.010-mF capacitor be 100 Wv 4.4n.nrm:mv nsm v-sm )ihq7?

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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 zvg/n+ks.2fc j : l3yka 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 l7,f3( 5/tbmbeud s hvwith 12.0 W resistance, 15.0 W inductivft 5 (7dbh,s3v/me lube reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20 35ierc 4u-z yv-rq;u)hi( mxb-mH coil, and 1.0-mF capacitor rqv4u5)u-y3x mbzi (;c- rhie 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 hm-ia)aqch4d k-a +.t1:q,/q o9e kohp b:fxl Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are ohhqatk m +c:h/po.f k4ixl 1--9qe:)dqaa,bconnected 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 connecter.yq)ep6dbn j (f3v 7dd in series with a 20-mH inductor, what is the impedance at 100ydv3fn( b).qed6 p7rj0 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 e 2uvhdsvhp;ej;m8q )/qo vf5jx08,kis connected in series with a 20-mH inductor, what is the phase angle dqj)sf 8p /5ejh8vu0 ;mvk2q e, vo;xhat 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 neededm lx sx4(0 tb7.2y/v(yh:shcpjkzc j1 in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 15mc( kx h.sv07(y xzptl21b: /j jshy4c00 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 with a 100-W 4-i9kv e1h1u g0qaqxwresistor ankxe vq09 141gw-uhaiq d 15-mH coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series whnw+fnp fccub4u ( e*l5k+ i9.ith a 450-mH inductor at 5000 Hz for a total impedance of 40000 Wuhuk il+en*c 49c n(ffbw5+.p?

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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 withyi4y h+/usdo1 a 100-kW resistor at 1.0-MHz for a total impedance oyd/ osihuy4+ 1f 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 caeh5c af-p7hpo *er,a1 pacitor. What is the impedance at 1000- 5c 1papea*7frhoeh , 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 fortfl6;+u 3 kc7u7 zwqtk a total impedance of 45 Wf+l77twtk6 u 3c zqk;u?

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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 wiy,zoa r iy(fsct vm+1gsqd3 -oh.b;;2th a 10-mF capacitor at 1.0 kHz for a phase anby2;(q-zd,; iaoc.sm ht+fo g31 vyrsgle 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. mvrr .8s1z.y)pami 6v0 kHz for a total imped.i v)y1.vr6p ammr zs8ance 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 capb/p0di3g:i.(/c cimgw;ucbi i j:iu2 acitor at 120 Hz. What is the phacj( .; gipiwci2i:: 30/i/cm bdgubuise 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 ad 9 kgy:-ev5cxreo *2x 100-W resistor, 20-mH coil, and 1.0-mF capacitor -2krc:d9xxgy *ev eo5are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W r;7 wwkvkvs;fd9y7f1 o9h+c sgesistor, a 10.0-mF capacitor, and a 0.350-H inductor d gf 7fwowy+1h;9v7 skks;c9v. The circuit is connected to 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 capacitive r ce8/teueuvnp6ez3f2g3co ,dnk5h* 5 eactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. W3c6 vue8f,2 eg55 ed p*ocuhzk3nnt/ehat 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-W resist.c 6sn sha1z ;3zcmot8lin-f 1or, a 10-mF capsm z16th3n so c 1-i.anz;lc8facitor, 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 resistori +o3fps) st.c(uza3z6z:xl a for a phase angle o s.p 3zz3fo:ci lt a+zsa(u)x6f $40^{\circ}$ 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. At what frequen kg;mwi8ln 4s(g/x(ob9 lia9xcy should the circuit be driven in order to have maximum power transferred from the driving soogi lna49m;xl 9b /(ixsw( g8kurce?

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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 resistancj:n*re g e2/jce, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is con e*2njr:c/ ejgnected 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 A0 tgalthb62*tem6+c cm: val8t3d uq.C 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 o9ouk7 p) hft)a resistance of 30 W. What is the power kpo)tu)f9o7h 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 resistor, aqc0t- 7au; r 22nybcb1m 5hunb 10-mF capacitor, and a 0.45-H m7 - anc2b0bb;q 1y5h 2utrcuninductor, 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 agw.jw2 5 v64:rx7 t) vfbjublf 1.0-mF capacitor and a 15-mH coil in series? fwvxfg6 47.jvublt:j2wr b 5)

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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 frevx a.c remuyoq6(cs:(g kk1( r402zouquency of 10 kHzzsqo0 6 k.(r1uvy : oxg4kc(aucmr2(e?

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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 3.7u w3ij5tcr88;7g5 leq5 dtm kn-mH inductor for a resonant frequency of 100 qj ; cr53il5gdk5emt8tn 78uw0 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 *jnu qb(mk*,g30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 ( ,gjn*qk *ubmHz?

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