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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 excepunhn (;8) y k0-ukxsiy tai/r7t

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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 stateg ;5mv fxz*(vqs that 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 loops of wire in a coil produces whatkp 23tex*i7m+c hehw: kind of change on the induced2c*3kmwp e+iehx7 th: $emf$, 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 d 9yi3kj9 l)mv;zg8;vp 7 .y/iao6m7utjhtxmfield through a loop of wire produces what kind of change on the ind3 7vm7;l.mk)yu986t jityv9a h ijxgz;p od/muced $emf$, 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 n c;1ny ;*ws)5 e3vmjdqie:dsof wire produces what kind of change on the induceddyq enw c1nms3j; e;*svi)d 5: $emf$, 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 fiel8qe+vhoi( ep)2wdzi/ d 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 wil md mr*cso/9k-l be that which tends to prodo*r/ s9 mm-kcduce 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 hh2 gd xs7 kippu:45bk0orizontal table. A bar magnet is held above its center with its nortdh bkp2 u:s70p ki4g5xh pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A :*y:vdw1mulm bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from abovm1 wlv d*y:um:e)

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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 then guwuqxg4tq2)w f-:1 magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced1gn2 w-quw:fq g)t4ux 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 magnetic fieldzen7s3s kcmv7i)q+n 7 f6e*-5gy zgs b vecto7e7 6+ mg 5k3)7*nqfnzy s bcs-vsizegr 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 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 to zbt, b8hj q,n l5rg)zet(y f8dh-/g7ip in a region where the magnetic field points straight down. The magnetic field hz/qbhn5trtglz jg-i8 ebf 8 )d,y,(7disappears 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 d-y- i7 1hotjqlies on a horizontal table and carries an ever-increasing currentq1j-odiy - 7th northward. 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 pole jq.q1+f1 eoi 2gc0tvt entering first. As the north pole enters the wire, the induced current will be 2o tcjqe+ .vqtf1 1gi0(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 constant angular speed about an axis2 wg5xy wn kph,;-qmb7 whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induq,hb2y ;gp w kxnw7m5-ced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis w( *kzat7a- dbcqq1 /gjhose direction can be varied. In-kaj1*z/7qac gb q td( 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 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.*9tctiq9pkzkc 4) f0x
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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 cbb*x)5pd 2x ;ju s wd:+ws7amu(dx g,that 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 dgp2 fwg;dz,; et/3ydt8di v2:g qv. za magnetic 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 dire6fpy.u oxx e/ oi( yy1v6bh1d6ction) is moved northward at constant velocity through a magnetic field that points straight down. Ma(/yoyu 6ed 11yofxvipbxh6 6.ke 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(/xq.op itdw/i /s.wq fc2z8m5ga6ma at 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 generator96iqzaap:7k1srlx2r, 3b vobl a : e8z 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 through 60 revolutioo;lh:c8 9vwntns each second. The frequency of the voh:;8wt 9n lc$emf$ 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 used tefbxzl,+p: f jl.-w x+o

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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 thaemepj8 g(5su, t

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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 pd5m yly habm cl*)s9n4b (-s4the primary coil then it is 9)cd4bl hl5m-ayn(*y sbs4m pa

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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 theqjcpq x* /xb2 y:g5:iz secondary coil thenzx*::cq 2 x5 bjgy/qpi it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the pul s3f qemy3h(e)47z mower 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 circuix8sf *.9 fadynt,

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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 2u9ppjqjnefq +8m3+y sqqnglt 8;86w connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistor pjgeqfs26qytlq u+jm88p +8w n93;qnis

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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 ingiwzb+ ih-4fj2 :k 6tv series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the vowivgkjfiz4+t6 b2 h- :ltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resista vl)hh1ej2d7xnce R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to xr r4rarg; , / l4a.jvjtz4l3tan $emf$. 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. Thoccrdib (w8j. 094rmw c; 9eowe time constant for the circuit represents the time reo(jr;r4.cw 9cw9bm i8c0 edwoquired 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 seri9+c qj+l2ib)1h 8au wso(fmf xes 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 d( fcfwu+8 m+joib x219)q ahslecrease 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 excfchkfd j,def/hdl *z5t +b4tw9f*9h6ept:

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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 circuit, the cur;ru*gg, /tuoof rct0 3rent

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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, the curren)-;l5topo1 ih:;go9jmj 9nfvcc : l kl;cg)ocvoj;h 1i:f9m nloj-:pl9ktl5 t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the frequ8m9fqz6 ov2bt;ktj6a ency is trij62a86ft9 vko;bmt zqpled?

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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 acrossdjwfqiyc tf6r0b o/3m0j 7g3w2 )n1o s an inductor is doubled, the inductive reactance of tha0 w7m fj1qj2 3scnwyiog0t/d3 for6b)t inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage acjou8gg k 41*nqd 1n7n:q 5vepnross an inductor approaches zero, the inductive re1gqg np*v7:dn 8o 4kj5nn1eq uactance 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 to3qu bh:iuk6,ph7l7o q an AC power supply. In this circuit, the currenqqi,o6 p7k 3u:7buhhlt

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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 changz2;y-, o)jfxs5 zhrse es by what factor when the frequency is tripleh zfjr2e) -x os,y5z;sd?

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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 volqqz7xvs9m5lmok1 b *+tage across a capacitor approaches zero, the capacitive reactance oxq9o1q ksb* m 7zlv5+mf 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 vou.d.7dr o r0-gq-nddzltages of the inductor and capacitor in a RLC ser-0dq.drnog.d 7dz ur-ies circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is definzu.zdn/v1xoli3i ff*w uk- ; ;,an;xwed 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 inei :ud+ rhh;8cgfg1: rar9,ua92 uxahcreases if R increases.e a,1:9fhgiaxrh;r:r cguaduh2+ u98 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 th3 kqj0pf :c+ fwr6sb4hf6tc1oe 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 increases i3c fkjciav5 pf*u0(3n5pk8y 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 dou28 e6cxy,izs kble in an LRC series circuit, the resonant frequency of that circuit z8siyc x2,e6kwill

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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 volta l p7h9y+bld -d2ur3dqge. 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 ekoa 1twj0pbs /vl5lq 75j*k*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 ig/g3 ljz9v*dq s rotating in a uniform magnetic field of 0.20l q9* 3vjdgz/g T. Find 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 2g(v 2)imyuu8)u93emc yeelkrotating in a uniform magnetic field of 0.20 T. Find the mae u3ey)vci82 g lm(2eu) muk9ygnetic 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 radius 0.10 m is rotating in a uniform magnetic field of 0.q3c j1t8a8f+h jt5o:y o efa.g20 T. Find the magnetic flux through the loop when the plane of the loop and the ffa83t1hjge:to +8c.q ya5ojmagnetic 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 m: n6qgz)r/6zdar 4x9 u0int radjustable 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 changwx joz+bxmwd ch7(3 l,e1r36des 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 208th tp s -ll.c 3yx.a*kpjxi,20 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied pt i.2kly8xp.cjh*stx a,pl-3erpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 tl*y.c+y8 se k0xio0ij urns 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 f+g2znz8 au t3,x7peu area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of gdxuc x1d tgp7t k743uqq9r/760 m flies horizontally at a location where the downward component of the Earth's magnetic field icu9du7x3 /gx7 qgk qtr7td4p1 s $6.0 \times 10^{-5} \; T$. 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 ro 8k0at /n1iyqptates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of/ki8y1np t q0a 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 crhn:bw nqp . kw8-e.j faeb5z0mz2se61jd; d f4oss-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator cons s+usif(1dxh*p7 +-q78jy f pflhmsc0ists of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each uwia tbop* -9;d5-p yy 3kg)ckloop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, 5i;9o3* a uk-cwgypp ydk)bt -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 k/: loc2xzs9-/l-gy 9hea zvtturns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generat(s.6bbi(+tvnzxl h e0 or with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is n6b . v0lxbs( izh+te(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 mafmw:s7p . o15o n,dxdbf9kou(upuk q01 o;o+nximum $emf$ 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.c 7zlhwj-dw,ecy0 j9 *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 resijk-p textgw/fem: ()dh6:p aq ,j+3y1.yh nmtstance of 6.00 W. The motor operates on 120 V AC, jt+hy6tmp :e,wj3:tge n-p1f hk)a xm(dq/ .yand 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 24-V power suph-6j u0ohz5;i mis i1rply. The oper1jim;oz6iu5s0h ih r-ating current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal rv3g+l3 :7 mv rdq f3k,fmx.efkesistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 l3 :vk +xfrk,fqv m3efd m7g3.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 connected ,m hj7aval-apf*oc;: to a 24-V power supply. The operating current is 1.0 A at full speed. What is ;fa*mjo- hc ap,7 lav: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 reduce a primary voltag zc3kb4ovy, i;s); zo ;t:dmxpe 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 iz 4eqx 1x2j y;65dvrycauses 14 A to flow in the secondary. y1yer 4q;25x izdxjv6 How 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 x h:y2pyc 3 3htl1b 36vwpaov5are necessary in a 110-V primary if the 24-V secondary hcvt6py xv3lh o:35ap hy1b2w 3as 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 200d 4l3rq; t i)eton:aq.0-turn secondary coil. If the current in the secondary is 3.0 A, what is t;i3t)qnaor 4ld:q t.ehe 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. Assumingj).workza 1ymn q5b(6 100% efficiency, how many amps at 24 V can fzm)5.ykn1a w6 b(q jorlow 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 10.0 mA.qyg) fh crd+dyc *7e2mi/-i )d The primary coil opera yhmdd)*-ie/7i2 r+f y c)qdcgtes 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 t:l fs wm),ew.8tv8y ewurns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the sewt. e8ls8w) e,vyfm:w condary?

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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 300f1b xq0j/lh+dvgtbk1:;f qo3;f b2kg turns on its secondary coil. If 120 V at 2.0 A is applied to the prgxlkfb hb b ffo01;d1jqgk/ v+3:q;2timary, 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 and its secondary has 200 tur kpv *,v)- il4ehgs6lsl hv;5qns. If the input current at the primary is 100 A, we can expect the output current at the secondary to bev )v-qi,;5*e4hlsslv 6lhgpk

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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 secon+orw)+ vsk /3bqfc *5n km.dpzdary has 200 turns. If the input voltage to the primary is 100 V, we can expect the out5s3cqdm*rvpokk.b f+z )w +/nput voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 282ip,f0taq sj: fl(6:ea zauq00 turns. If i j: :qae8asq6u ,fzpa(0fl2t the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 ghg 1uweq3 0q1a7b2jv A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W h1q1qg0a3jv w2egub 7. 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. Tdwj2, a vv(d 1i;tnws(he 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 percsja, 1vdvn; (2 w(widtentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of 7r6 hc:vvir5p x gcx4ob f;;1uu3wa)v current at 120 V. The voltage is usually stepped up tohfr ac463v: ;7gcxr1vbxu) o u;wivp5 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 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 1drh n/yk*)w0 jsy(fb of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission linejyb r(/* w dkn0fh1s)y, 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 resistance of 0.60 W. A genera0:yjsv il4nr: tor produces 10ilryv4 njs::00 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 lisc/eo5m b ck8 rzd,x36iwpw /6ne at 1000 V. How much less power would be lost s/k6z 5 b,rwxdom8c ie/3p6wcif the power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It isqm 4;;bvofr7-a q uu5b 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 45f v ;arubqmo-ub7q; 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 currew i q oa,o5xad2dv* sn.*s,sf.nt of 5.0 A. How much energy is stored in the coil's mag2.io. * ow*5,v ssqsxf, daadnnetic 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. W7e6j zal,3onp:dt vt3hat is this circuit's time con3dat le63on :p7zv t,jstant?

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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 cq wlt+5d6 (ilx: i02lvmn4jtkircuit 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-V4 7p nyx1wfw) duo3jf4 b36dne 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 placed into a 120-V AC outlet. What4f mn3kss1g w1ng .s;d is the resistance of the lampg 1d ks413fw sn.s;mgn?

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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 supio*p.xk2t/lsdby v2 -9c1grrlce 00 oply. What is the peak curreclyrdr2 s2o 1e 0*9 b/ gil.tkxo-0pvcnt through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is they 5g*a 9rnw90o pb)lth power dissipated in the resir*g9a o0w)tl 5yh9bnp stor?

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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,p*hieq20 l )ssv -g/xvnqw1da sw6:ltor 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 5q ,)*l j+;p5e*pg fkpvc orlb50-W 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 m vb++w c2 fvr6zw3xq4is $I = 0.80 \sin (240 t)$. 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.o -uj,zgrr.9* ilohs20-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 reactance0d(rb8;b;py mylwsx- of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14qww )4k37dblm.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inducti/bf,2svmh ax 4ve reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 kHz yxcxy658-esnve )gli hxd7/4n 5 6bm gis applied tx/cl4sy 7nm )8-x6x5gvb n5deh y6ige o 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 2.50n+,zd iq /j2iy8mqyz9-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 e3 osu w9j dl3ll;*fs*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 d/. (toroq -8lt5umjvneeded to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitora miho r810.iq 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 react.iymkl d h1kr0sb dl* 62761ic9qx nmgance of a 0.010-mF capacitor be 100 Wn1l*.l72g9b hs6 16yq d0ii mxkkdcmr ?

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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 atpavvrkv :*o a08uqb2578fnd. :rev gp 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 circui0q:7 pgfxw3est with 12.0 W resistance, 15.0 W inductive reactance, andgq3p0:x f e7sw 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-mH coil, t(e,lly dp+9u and 1.0-mF capae(,d9ul+ tylpcitor 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 1vdt6t m2. t r-8mdrr(n;gvfy 2500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in sdt(tmmd2.6v8r ytg r;nr-v f2eries?

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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 induc 37gt n 3ux fr(*o;+ a9 af8k1mwtwwp(ml1oeoutor, what is the impedance at 1000 lf1 n ou+9e pm3ox 3tatg7kw(;mr*8wou fw(1aHz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, whatwx e5r7,:aw)watc+9 h-g:il przux5m is the phase angle at 1000 hi wglea:5u ,5-9wx r+:xcmat wpz7r)Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a wq6r+;pbw(oxbo31 lu6e1nn nji f *b.20-mH coil and 1.0-mF capacitor for a tu*lbre 6o3o.j6b+ 1pwnnfwxb (1nq i; otal impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resistomaqm3u-ry /b6i5; jc rr and 15-mH coil to get a total impedance of 110 m-36rriab5 j yuc/ ;qmW at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for azg.hj;6sbp wg8 h7r4b.fe , am total ima ,j.6g.bm f7hgbw4s rz8he; ppedance 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 a .ags:nx8p7ix t 1.0-MHz for a totxi.x ns7pa:g 8al impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. Whapfc;sl70ts +b2q:g m ar i.a(qt is the impedance 2( ls t;+ saqigm:apf0cbrq.7 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 .hzu;7,n*fx *oadbhz,e 6 ppg7;ndi r at 1.0 kHz for a total i6n*7ng;p7h .hua zi,box zp f,ed *;rdmpedance 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 n.m5u9:kum sql7t + 5u ak8k+l)f zncngeeded in series with a 10-mF capacitor at 1.0 kHz for a phase af mau8t):nl+.uklnmk 9zuc5q +s5g7kngle 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 resistortl6z -ay/:y2 jzwtt1fmq g9 +v at 1.0 kHz for a total imped-wtjz6 + g2v: qtz9f1t/yymal ance 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 ser n))sm-hfqhd ,golo25.r)d fiies with a 100-mF capacitor at 120 Hz. What is the phase a2hog-di)nqs)l m5 , r hfo.fd)ngle?

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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 1gid,bwtf c(g1p f,4h)500 Hz if a 100-W resistor, 20-mH coil, and 1.0c( )hwf1d4,tgbi ,fgp-mF capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, hhmc;n ppd8je/1 rsee;td.(5 and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the e5s;.hh 8d 1(pen ctj/ emdrp;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 capacizs: p.yog .9 nlnj0b:itive 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 i:pgzb.j ny.is9 o 0:lnn 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 cirm(qbitra a;0qd 8 ;d/dcuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H indu ; (ddqm0;taqr/8bdaictor, 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 sef5 t-ym lajb bl8tb3s9wz(h5(ries with a 500-W resistor for a phase angle of flh 8t -abt9bzmsw (53y5j (lb$40^{\circ}$ 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-m4csr *g/ jaay *tjni t.rg5,m:f c0o6tH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power tsi r af:tt0 / c4cnya*j jo*6t5gr,g.mransferred 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 iyqn2uaaa 8 1t -7j/ghrn an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitivhgy-a18q7 ta2/aj rune reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of av+id bpm, 1iu tqw1z klg 2)67wl2vy+sn 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 30rk7dfd3-)vt2k 2p+ ek mbqlo 9 W. What is the power factoeq3o ) p92v2kr7d m+b kfkdlt-r?

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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, a jlz-s 3*o4 yva10yvsa-z4* j3lo-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 frequen g:r6b:-b9 ,ooz( zlqb d(znrjcy of a 1.0-mF capacitor and a 15-mH coil in series?r-n9 :obr(zo d:(gzb jq, z6lb

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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 capacitorg2o8 n5z0bw8jhkgwc : for a resonant frequency 0o nk g:gwj825w8bchz of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant fq:l6f 8)5 zonzgc. je8f8i:i6oh n,8r umm unjrequency o 8c8f:ingojj5 f8zom:nl,zmih u.eu)qr6 8 6n f 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W)s-bggu g8qee)sp , )w resistor and a 40-mH coil if the resonant frequency -uge)gbsw 8e,)g qsp)of the circuit is to be 1000 Hz?

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