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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 z)wl 8 q;ilok6 ku+8 lcnc3lk7units 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 tq0agas3lh67qr/u3z,l8 cce o he $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil pro:tp ) o9wf21rgdv9/tmblxm xbh2)mr; duces what kind of change on the inducedfg9 2rb trx;tv)x:/ )9bhmml wo1 p2md $emf$, 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 lo xf41qqyn6zd6 dr )/ubop of wire produces what kind of change on the induced d)qzx 1qn6b fy/ u4d6r$emf$, 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 cha2qgjh q:ig .l46p t9otnge on the indu6t t.4j loqigh2:p 9gqced $emf$, 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 magnetipw 7 -.27jbjz/qvf jkuc 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 induceig fgrawjt1* n9 hu4w +a4b61cd current in a conductor will be that which tends to produce which of the following effects?rw 4hn tc1b*6 awgiuja+91fg4

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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 tpiyt6kg0j j huls2 ni1 .k+i64able. A bar magnet is held above its center with its north polej2.kky inu6j1li t 6gh0+p4i s 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 flat on a horizontal table. A bar magnet is held ab no 8xmv+ha*2oove its center with its north pole po+x h2vmao *8nointing down, 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 q x ;n+lr( w(wel1i2:qbvg,dutop in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current il(;2dxl re1 q+b wun,qi wv(:gn 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 tabl):qizc j/z;t (c*oz sse top in a 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 induced current in this coil as the t:z(zois/*z;c)qcjs 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 horizontavgbt:;3y1 gh ag+xb. rl table top in a region where the magnetic field points straighty;+gxg.a3v 1h rg:b bt 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 clm xjs(.2ic4a horizontal table and carries an ever-increasing current northward. Two coils of wire lie fla.xcs m42i jlc(t 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 l1he- mo1 rnrc, e8zve25/rv zgoop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as vi-evez2v 8cgr5rn h1 ,rm z/eo1ewed 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 constazv4 xf0 injdqle- 04+bnt angular speed about an axis whose direction can be varied. In a region wh vl4x jb0nf-0 zdi4e+qere 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 cc 2 hc6;4vvi5ex6;zees yc)ox 3zvd.m onstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points vhy 63e c izxx.vm;ze25cds4c)6o;ev 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. 7ctcn3eaf y na4+fy5-zd4v2-jc e /sh
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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 thath2( : ky23y,qmvjnh vz 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 magnet- vgrq8gx*8yay 46qaiic 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 direction) is moved n m vz(ril0w;6yorthward at constant velocity through a magnetic field that points straight do6z0( yrvwlm;iwn. 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 a0q,b- nb;ag:yx nozn(t a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator trans4ab8 ps06oquiforms

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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 throjdc4+v ni7 7br)ao o/augh 60 revolutions each second. The frequency of the ca4/iv dbrnooa+)j77 $emf$ 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 devj 76utjpib,4d -cmu)s ice 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;uma.l5+h lw g 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 coib840 zqg,(i cr6xkoh5 yg9ku ll contains more loops than the primary coil then it is a0y8kk(6i9 l5grbz qxo,ug ch4

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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 than * ( uyusib.t.v. zujj8the secondary coil then it uu.b8i y.s(tj*v j.zu 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 poynxr 9,hc l42mwer 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 circuokm gg:ym :9)eit,

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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 a+dd4ca0sb3v t n ideal battery of constant termicdt+va 0bs4d3 nal voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are cone.at8saizw e n5ik696.ahv1dnected in series to an ideal battery of constant termi sw.6 v91.8eaehaa6 in kzti5dnal voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connectedrvomz6;rgj+w4o2 imj6 i1; s m 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 resimve gpb3 ca1+8 pt.jizun,fq-9j6)d gstance 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. T6 w y6qb.tny.dhe time constant for the circuit represents the y6yq wtb d.6n.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 con +s.nxxueia9 l/tab;4nected in series to a battery. The battery is suddenly removed from the circuit. T+.lne;ia4ux/9x abs the time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following havemso+(qy v90dy the same units 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 supplyfy.,3 f(fsiiobll74 x . 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 supply. In this circuit, th s(k 9waxd+x n3*;kdree current+;( xr3axd9*k sndwke

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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 frequ1ixurd voc e74)hi*: uency is tripled? x e:iho1u d*cir7uv)4

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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 acx7 yyt7sm+w v5fc4ggw 2)g5 tkross an inductor is doubled, the inductive reactg24gwy5t t+c5s f7 gvwxy)km7ance 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 volte4y:rz(qx2ktt6qx2 uage across an inductor approaches zero, the inductive reacta( rqxqyz22:u6etkx4t nce 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, th u8 zwcz2(t5mxyzqhyoz3qa o+ggq:* /o,2 nl/e currentq2,*q:muzoyzxglt o3 / gco8/(zn+h2 5za ywq

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by myvf .ybe)qo,tm(e .,av o* 5cwhat factor when the frequency is tyba*,vf .5 .m,toyc(vo emeq)ripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the cappuji:r6t k aa9,1d 37i sszv0eh,8zppacitive reactance of thvis9p:3s,j1 z rutedphaz,pi 70 8a6kat 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 vw. y retb/2*v )e/mjljoltages of the inductor and capacitor in a RLC series jb.v*r l /e) w2jme/tycircuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined as 9ftxqj:v k ctf f.ig1 9j0fh+ 9j3nvs.$\cos M = R/Z$, 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 imped7 ghs3f8l;rmh um dg9:ance of the circuit increases if R increases. dhrgum h3 s8fg79;m:l When 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 impedance of thexn, 2xd/te1zqb5vz. r 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 circuiqa2)rv qxh9- z c7sw;dt 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 both double in an LRC seri/0ttpn6lnuw+ es circuit, the resonant frequency of thattn0/nu 6 wl+pt 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 voltage5:jc np/l.,ouxwdou . . 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 circuitd7i h )vo)5qmfks7q 4ujaxwl./r *,nz occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of9q) ,lnmx4b/bsle: d0 dl )wrv 0.20 T. Find the magnetic flux through the loop whedw m/ q04ble )d ,rsxllbv9n:)n 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 roqyxg*s;n:rcjx 7pu. .tating in a uniform magnetic field of 0.20 T. Find the magnetic flux througryqp*cns.x.; 7 ujx:gh 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 radius 0.10 m is rotating iv,tmn(2x5+z ,pjaj lon a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop 5nj,m vjz(2apox+ l, tand 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 loop is reduce -ioqj9x) s29f uwogw(d 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 changesbtd1*v v. r, +8,zr)7slb e-qfssotaj 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 turn-/w1fov njv+k u wi.kk. ut-:ds of 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 uniform. uotjkv: n-w1kuk-+./i dfvwly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an aredpojvc z;(ir6yo/k+ -a 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 zzz,d948 ciqo $0.20 \; m^{2}$ 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 fe41v .px exh sxos)57location where the downward component of the Earth's magnet7fxoe5s.vhsp4 x)e1xic 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 ig 6h,q/kqm:o f 3h/jlat a constant angular velocity of 2.0 q o3hg/jm , kf6h/:lqirad/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 50 loops and a cross- /g5mjd025 sznxsz 7glsectional 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 gf21x*r *fhou5ro*ts 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is 12 rs zaku4-+4 s)i eat )ahkt9n7cm 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, whik4-ahs)9e 4t7sa+kzr uai )tnch 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 z+ubr 9qq97(qse9ch /sgala) ire 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 3kwleo)7:axi a simple AC generator with an output of 12 V maximum 7:3i oa)ekxw lwhen rotated at 60 Hz. A magnetic 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 gen9(;, ixragt:x)lb pimerator 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 *,m c cuw2 mpl.iwoh:h p,bkbkaikt8t)w1 :/06.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. Tso734a pr ui-t nm98hxhe motor operates on 128omu r n9 tsahx3i4p-70 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 resistance7t9se;w xyf+ a8iz11;cmq qfk 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. Whaafi1+f7 ;tcqkmz89;s1 y wxqet 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 j6tcjxx4r(x * 6 wr7 8i/xipbp24-V power supply. The operating cu7i 6x4/x*jx8 bp6cptjxrir(w rrent is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is d80pr / m,6ro 9nvx1xlrd(dyrconnected to a 24-V power supply. The operating current is 1.0 A at full speed. Whr9lv 16rrn xdx8py(0ro/,mdd at 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 y731yqi;ujf cfgni .+o x,tv: 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 primar--jrsu 8b2g koy of a transformer causes 14 A to flow in the secondary. rb2-k s-o8gjuHow 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 tv 7tjg5p0;n uh +qiex4urns are necessary in a 110-V primary if the 24-V secondatn+vp4e0;7gqj hx ui5ry has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-8cei f/wg;7zd-x r- ;bc ots(qturn secondary coil. If the current in g(s/ ;8c-q-dx zt7f;eb icrow the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% efficiency,;mq w/zh*6jy w9(v uxf how many amps at 24 V can flow in the *um (jxh q zv;yw9/6wfsecondary?

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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 3n :e6 1b8i. w0mnbndfbkri0z 4-zyodprovides 7500 V at 10.0 mA. The primary cn n0ney6z.8bd fdb: iimw31z-4o0rb koil 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 60at3 c5,sfwyy;nth t.7b wwuvq )q(k*9 turns 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 t .yq 3t5w 9a,7kt(bysvc ;*fw unh)wqsecondary?

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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 tuvt ,;.2an) ibm5swxqbrns on its secondary coil. If 120 V at 2.0 A is applied to the prim ;itvamsx.wbqn),2 5bary, 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 h3 7pzb*kk,t7t,5rkvm exoxg9 as 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondary t, xv3t*5t ,9xg 7pkr7bomzk eko 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*iyrqsw x/5 (v(ee omx) c-0flrns. If the input voltage to the primary is 100 V, we can expect the output xy)re vl*fiqo0 ( x(/-wm c5sevoltage 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 trahgpy;d2(2l pnn: x+vbivda3 3nsformer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect thvga32;ylipdvp :2nd 3xh b+ (ne 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 6k-odasu e+o1: 0 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted thr-k+o:sd ue1aoough 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 voltage is usu7dddwvf / b,qbg:6 7fpally stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage poweb7d67wgff/dp:,b v d qr lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of curryev )*789ze jrz a)czzent at 120 V. The voltage is usually stepped up to 457z 8)a9e jrcvz)z y*ez00 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 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 :skr/gx;n.l f line 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a tran k;gxrl .sf:n/sformer 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 resistance ugjvsh(5/mev w;81z:5jwn (h fyd3cr of 0.60 W. A generator p;ms j (( nu8zydhwhc1v53 rj e5v/:gfwroduces 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 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. w3k j;:.dq tooHow much less power would be lost if the power were transmitted at 3000 V instead of a3:k oq ;dj.otwt 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.(.h6y cv y:zw-m px2ygb5g 6tz It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator outpuvp2z: m bz6y txhg5cyy .-6gw(t be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in the i2dbtn2 9;3cqg;p ss gcoil's magne9;b3cpgs2i nt;2 gsdq tic 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 contn,ilc)7py 74.f p jvu+vpr+e7sdm:r u ains a 6.0-W resistor and an 18-H inductor. What is this circuilnvrc++4pi7 jfm:u psd v,. )7e7ypurt's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an ACyadtvrfb46jlp.8zqt9 b / 9 c) 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 out :fn; iln ejvsqp62qko,246gxlet. 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 placed into a 120-V AC outlet. What is the resistance of cpie02j+ kqm 186rbjl ch1 yz*the lamp? c0je 1qyi6plb k+hz*c m21r8j

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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 power supa4/2bohi)hy ooc 4;pu c h9z,tu bwu;*ply. What is the peak current through the resisobh /ha)ui by;u4cozp4cwt;,9h o 2* utor?

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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 is the power5s.n;tn rube j8) mwt+ dissipated ins+t t8.u n)ebwmnj;r 5 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 w4d,u4 -cgma )w m k5lum0ooc;v.*h4ct l4owsa 50-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 re:c s *6ir 2ywwkz..qbdsistor 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 isb;8 xkocp kvc1c o2* u.ulko(qso,g+ * $I = 0.80 \sin (240 t)$. 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 ind ftspu6:u ,jgj+vlnwb bj37*gkqt )76uctor 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 asg c3lo i5q (:wd1s h*7vo:vqh 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reactanceeey1qhdwb: / /?

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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 fd)o9 pq 3p9lfeor 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows ifpl 4fm+u:f f(n a 60-mH inductor when 120 V AC at a frequency of 20 kHz is appl+ u:lpffff(m4ied 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 1107gnie nlpro fm:j+ r5*+c1j7 w-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF caph5ew 1ka e)7yeuk;*hs acitor 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 10w5hcosoa*uf0 r .sjciv94 j 2* 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 react+ps86ew2de: ;flc vwoance 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 thc ikb8qc 3):d-qkkl7se capacitive reactance of a 0.010-mF capacitor be 100 Wbd-s7qkqkik l3c)c: 8?

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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 and z5demdf: 6 ;km5.0 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 wit a dy:481 0p6xh) qebh+gytasqh 12.0 W resistance, 15.0 W inductive reactance, and 10.0q)14qhhep x tayds:0gba +y86 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-mu:x1rzq ecr 51H coil, and 1.0-mF capacitor ar1:xuq5 z rcre1e 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 resisco we-mq :bxrcb ;x5jd1t e7,/tor, 20-mH coil, and 1.0-mF capacito 7w1/c5qmeb,oxb:jd- x rct;er are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what , .buaug.ir 7le 4:vtdis the impedance at e,d tg.a.4 u:blv7iru1000 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 connec8+m w:wgur reu5gd. r-rwp i-/ted in series with a 20-mH inductor, what is the phase angle at 1000 Hz?/miw d.5reurrgu+- :w- 8rwgp

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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 se7 p il8tfzke6x c6ow/4ries circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance8cf ptw/6x 6ielz4k7o 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 capacitanxhl k+hh/;,v dhf56 :wr(q,4a ffmx3ldyf:isces is needed in series with a 100-W resistor and 15-mH coil to gexfhl x63dm (s4+f5;yfihhrwv l: ka ,d qhf:,/t a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 45)rfyft0 dh31ga wfgd**( -bfl0-mH inductor at 5000 Hz for a total impedance of 40000 W?0d f lf*b *ha)tgrf( w-g31fyd

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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 withuq. eo1 6u of5rxz;/watc8f2e a 100-kW resistor at 1.0-MHz for a total impedance ofreu6fa1. ;oeco qf8 2xzuwt/5 150 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 inp5 r)y,es7m (+hhorvq series with a 20-mF capacitor. What is the impedes+oyr(5 m,ph)q r7vh ance at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a totmq+- xqlwvw 3ea5, /alal impedanc mqx w-+va5laeq/3, lwe 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 with a 10-mF capu q ce xfl*5.eyrk)+fpz+dy+2 acitor at 1.0 kHz for a phase +q+ x)fek2 fyur y pdl*ez+.c5angle 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 neeozih118*h ya)f8zkgp ,ijl: oded in series with a 30-W resistor at 1.0 kHz for a total impedance )p*iaizh8 h18 g:ykj1o of,lzof 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-.7n3kvh+ xwe ;yzwsyw8dh ) f7c 2egsd--) nckmF capacitor at 120 Hz. What is the phack e .w7zc8 hh3-vn)yy ks fd7;w+-xg2de wns)se 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 atw:x5 .1n*wz gpdpv .bh 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are vwh1gd z.*pbpx n :.5wconnected 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 resistor0ul5,k-biy e nx8 ,bunx4qob 2, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms currnebn 0uux,b528 x q 4yk,lb-oient 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 hkmrff 2)l po*,(wg dl0y7d 6cp:anz3 capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in thowf knpd)lar ,d6*7g3yfh02 ml :(cpzis 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 circuit7 va.z76 b:v)jt cc- mk.lssrk containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor,vk )jk.-7b6cz sv ra7l.s:mct 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 ww0np 7 jhxobx)1o02- 5kmjhl la2t.hu+ )xonz ith a 500-W resistor for a phase angle ofnth z)2 0p- lkl)5mhohojxbo.+xx7n1 w ja 2u0 $40^{\circ}$ 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 Rec6jjm21 ru-g = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power tra jmrugj2 61-censferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuitqqk-- d8v4yymztv.qw +-yhw * with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance,v-.y -tvwm*y+k4wqq q h-yz8d 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 p /q37aqi8flg AC 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. What isfc p f 9ta48pyfgp8m*jf1-gp , the power factor8p9m -gjf,f8fpfc*gpay pt4 1 ?

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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 dcey k6 7-z9 w 21fmovsw6fs)(cnm2 lnseries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a c279 kmw1y)s(odmlfnv n2 ws66 zec-f0.45-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 seriet yvt49 3wku+rk1 j.xis?x+1tikt wy9j4 uvk3r .

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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 withrbdsx6uks ,995 b*o uo h2g5dd a 4.7-mF capacitor for a resonant frequency of 10 kHz?9brsdh*2u d sko xdb95og65u,

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-ms- jcs9vg9*c lH inductor for a resonant frequency of 1000 Hv-9 lsc*s c9jgz?

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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 sv6rwyb tm.9 . ssr7ma0auv+u0jto1e)eries with a 30-W resistor and a 40-mH coil if the resonant frequency of the cirr)wsut.9 6r aj u1eamt0vsvbom +y0.7 cuit is to be 1000 Hz?

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