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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 mahd0kd+j1.xjx hzxoi y c3.oaa9 - b8q:gnetic 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 thex;8rb 7gg.+ulyv/tnc $emf$ 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 gosjc x)+ /0hr4f8sxpuol;8f v -naj3of loops of wire in a coil produces what kind of change on tsu 4slo-;j)8ffvjrn ap /xxco h3 0+8ghe induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic fie+t l9+qkuw57f)hz v ijld through a loop of wire produces what kind of change on the in+k7lq5u)jiw 9 hfvt+zduced $emf$, 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 lh0:8ogv(lj 2lb-1zix. stqbg oop of wire produces what kind of change on the induced 0g s8g:(vx1qtboj2.l lhi-zb$emf$, 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 magnetaq -r6l t.qbpex(xtc(+* 4i jeic 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 l f2 /jxz+i(obb1b8q :wzbhk-an induced current in a conductor will be that which82bb/ o j-1i (f zkhqbbwxzl:+ tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held pcny *hbhmj :8ct+h.7above its center with t+hhm*8 ncy .7cjpbh: its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held af;4. ,vr p lyyptf-yq)bove its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (whenf), pl ;4.-qypyrftvy viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where tp*55(l7kg zh)khcr fthe magnetic field vector points straight ukl5 c(7htpzfkg)* rh5 p. The magnetic field vanishes suddenly. When 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 level table top in a1n.92 ira)aemef h05 eczhop4eam2;b region where the magnetic field vector points straight u0 1izn9 f p4e ahm2h.eerme;aoacb5)2p. 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 top uu z rm3y h-1yy,c7xi.in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, whimryu z 7hx.y1c,-3uyat 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 horizonta;b;l (xkxfz2 dl table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed fd zkx(; lbx;2from 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 po1jhwq gmu e(gh7 :,ck:le entering first. As the north c :1mw kq ju,eh7ghg:(pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotat4c rq5gnr/v( red at constant angular speed about an axis whose direction can be varied. In a regr5rnrc /v4qg(ion where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated t /4ad m2wx)z6p0 qux)rx 2 kkovmew)2at 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 rotatik 0)wxw/ m x 4xuz t6dp)mav)r2koqe22on 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.a6;r uif ;snx8
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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 that an vtmvp8mon 9 /30:r*;mvbhksg$emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic fiel5/stkxh ahkjc.r6h 1b nrk4 ps-m c:28d. 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 northward aunein1huhiga38o03 w u+.u,e t constant velocity through a magnetic field that points straight down. Make a statement concerning the poue3ea,0 now8 .iug3hunh u +i1tential 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 amm89wm h/i;xk 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 k 9/qwa 47t12ipxrfb ztransforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frequencyo,llusmv40*b9 ap:g z of thgz,s9vm a:o*ubl4 l p0e $emf$ 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 to1ia, a2xghf7vfdfi p21a0 ijpx)65eg

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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 de:yl,3myp6x3q9ek b m cvice 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 c3ca. x;xo k4j7tg,o3ki 2 flq./w.sttis d w/eoil contains more loops than the primary coil then it is a/j.dxex3;wtg k , oqkcl3i4tof.is/ 27wst 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 than t) iyzq j y9ye2(ur3*y4ixh:oc he secondary coil tz*e)io:y 3c ry4yh yj2 x9qi(uhen 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 plypyhqf20 a- 0p(hiw.ower 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 circv o)j+jsh* el3 .qml)tuit,

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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 serivuty2vc oeh7lao2 (.7es to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across 7(2ov2auet .hcovly7 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 ar*h+gjb3 8 vjpke connected in series to an ideal battery of constant terminal voltage. At the moment 8jjh*v 3 bgp+kcontact 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 connected to agsfzzf91yw 940by lz.n $emf$. 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 inductanc v,f26 i.ohuvde L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in ser10oiaesd+ mc ct52lppw5w. an rx*3;pies to a battery. The time constant for the circuit represents the time required for the currenpl e3x 1iaa2wtc*50n.so p5+d ;rwmpc t to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The battetgibg8 :li.3ory is suddenly removed from the circuit. The time constant for of the circuit represents the time required for oi8b. :3t lgigthe 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 following7b; :oee le-lnnl1de :sj/g);vho q+z have 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 po:xxe) h6mbot3 8yzx 2qwer 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 conn v5hi* c-w-bcgd;g(f( cst h.nected to an AC power supply. In this circuit, the curren -t(*wgf. vhcnicg (s;b hdc-5t

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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 uf d p( ,ak9t*nj iikxj)bj zpf2)b6y92/5k udac circuit changes by what factor when the frequenk/p6b9unxdk5)*ijf) 2 ,btf(kdja j 9u py2izcy is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor .48j vbetul0(wzfwg -is doubled, the inductive reactance of that induczg(l84. tfw-j uev b0wtor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approacd0lds(.k9v-gci8 tv rhes zero, the inductive reactanskt9-.d8i r gcv( 0lvdce 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 t1 b, x;;+gnwa)ohnzf5bndudc y+*fu4o an AC power supply. In this circuit, the currenznyd4 o fxdn+1+c) g,hwbb*;5u a;ufnt

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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 whatw r0n4l ,ws*dt factor when the frequency is sw0nwl ,r td*4tripled?

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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 zero0b wdw-x0eii 5.tm+jg, the capacitive reactance of that capa+g5j00x . ide- mwtbwicitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor i+ij)ayp+ 7xif if*:hc n a RL y if:cf+7ja* +h)xiipC series 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 define+qyri 6veh*uz8*i)d dd as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases i5qu75ci8 skorf R increases. When is this statement s75q8kiu5cr o 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 the e**uo4wy1v ix ly:z+9m,r n tfcircuit 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 cirxi 0q4r2no501fl tc6i( asc6 1wq ek4krwi-d bcuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circ jd7b yz):v8lqe zt5p5e -p/dbuit, the resonant frequency of that circu7q):5vb/lpy j zb-pdz8t d e5eit 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 voltag0z fiphr-/ h4ye. 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 0 aza9/dyk8( btc8yg oRLC circuit 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 fe+2jwz.y /jl gield of 0.20 T. Find the magnetic flux through the loop when the plane of the loop andzlj .gywje /+2 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 rjm;+r zr*y2k m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the planem2*jzr +; ykrr 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 ofokx:mv+ 2+hp q 0.20 T. Find the magnetic flux through the loop when the plane of the loop and pm2:hq +v+oxkthe 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 reduced fromt-1sg)z)tc9. v.pqq q j rewhnsob.82 $1.0 \; m^{2}$ 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 changes7n2w mt fzln,kgi90yu,;e 5c m from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cm-(wi *fdkd 0e40gv19motgvh vfw(c :u. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.9-4w0di *fo:uhwc(mgdv ef v0( k gvt10 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 hy 5tou0ph 08fkxq++lturns 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 a9z lntf3m 4 m+,cy)juurea $0.20 \; m^{2}$ 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 atjj2 ggvzzk .u 0jyb-5k+ y14lj a location where the downward component of the Earth'sk2 j0ubyyg-+z .l1kgj zj45v j 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 r4lk qych5 m0zcpp2- 5iotates at a constant angular velocity of 2.0 rad/s about a vertical axis throu-klq52 ipcyczm504p hgh 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-sectionalhsj)w 1fq( pxa-k5y;cj4lo o-h ; ph3l area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 tua1zms7tud lr* +d6 av(rns 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 cj3va;jb dkuf1.)8+i c9 rukw 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 magnj v di.wucf)b;1u8 jrkk+3 a9cetic 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 tuvli-l;/oz: :o- eu sdkrns 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 c nhfog wre5y,(g192ty l4.mnconstruct a simple AC generator with an output of 12 V maximum wgn4y mef9. ,1n(g lo2c5 rythwhen 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 generator with a d ioulfm61: 2 zboe)n87tvye6maximum $emf$ 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. Tacv,1b7.tsl7y i +ob0ej- pvaxz3mi)he 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 * 6g2rh;6ib- x c7;ya 8bukekynbxe-g motor have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at fullbknh;2* x cr;bb 7iga-gy6eyk6ue8x - 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 supplz-ql-wl6 -qdj-x2lkm;j sg 1 sy. The operating current is 1.0 A. What is the startk-lsgl21 m-zj ;6qd q sl--xjw-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. Tc/y6;h5kk p + kx w ysxn)ac0j(j0ui;ehe operating current is 1.0 A at full speed. x0pj;kkyak+c/y6wes5ji xh)u (c0n ; 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 i+ i2a8*njm2 sock+3+yyp9jiuh qxg5 ms connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the baqih3o k 95*+xiya2jum+8jgy+2s pmcn ck $emf$ 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 pri1 go. f;ixs5rqd,u9zv mary 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 tra 1s9p b grgk9xd)jov78nsformer causes 14 A to flow in the secondary. How manb189 dr7g)k9vgpjxo s y 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 t1fk/r1v dq:wjs -tk; w1g)wedhe 24-V secondary has)rq ew1-1jdf1v sd;wk:tg w/k 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-turn secondi7t rzu w,hus k;aje2:89os 8mary coi,w9imru 2o7khzs j;8 ut8a s:el. If the current in 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 thebj dk o )lnl9cx/4bx.z-ks4x 5+mii;;1pthkb primary of a transformer. Assuming 100% efficiency, how many amps at 24 Vz-iln;+bl.bt b /x m;1h9kj4kxsdic)p5x k o4 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 mxpo42pu 2l.w8re 4n.jjn dpk++qu. b sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary d d+ .b 2 pl+m4x2pnp.rn4.qwjkou8je uraw?

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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 tuh.6e cvcecl4 (rns on its secondary coil. If 120 V at 2.0 A is applied to the primaryc .(v4helcec6 , what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60pmxjrel +m0 g6b, *:d2e*wkn dngfh:t0:xn /m 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 current is present ikmnbt0e+g l0j: *ng:ndxdx p* w6m/2m,:feh rn 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 tu:z( r,0k.vtkr f yiou2rns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expectuv.: of kr2(zir0,ykt the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. If pbzj1 r3vk8bxj/8hq 3the input voltage to the primary is 100 V, we can expect the output voltage objb3/ rx k8jqh8 3vz1pf 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 secondary3p ajztd.fu qx jycc9r+;-5x: has 200 turns. If the power input to the primary is 100 W, we can expect the power outputf tcdy5-qp+ajc 9:.j3 uxrz;x of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually steppedj2fuojm:/ 5yu up to 4500 V by a transformer and tranj5fj2/y u m:ousmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually step cl02x j6)s rp5aicgr5 mbm./hped up to 4500 V by a transformer and transmittjsr6.ml2)5r5im/ bgpcx hca0 ed 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 of current at 120 V. The voltal, 31, :re vn6gwb7uhu0*abb datmbq- ge 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 t,ab rlv egt*ub:,n7w mbb1uqh63a0- dransmission 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 total9ebz i:bj be./2l q2uk resistance of 0.60 W. A generator produces 100 V at 70e u.9kbi 22b :ej/qzbl 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 resistance of 0.rn qdzm;r i4l*w egy.03)jx*c60 W. A generator produces 100 V ajlgyrd*x0 z;4qricm 3 wn .e*)t 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. How much less power wtrbb454e5jxi .h ,we pould be lost if the power were transmitted at 3000 V in4b4j bpw,ih55e.r t xestead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted oav(c6xk 4,h32 uc-w )pjliaqhn a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is notq,hi-jahvaw( cc kp26uxl 34) 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 inma/cw0 p8a t0 jd7at-x the coil's magneticatp 0xdma -87c 0atw/j 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 co)wf;k*l(ib-*z rqt l untains a 6.0-W resistor and an 18-H inductor. What is thirilw ;qbf* -)ut(*zkls circuit'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 AC circuit where o-)u un,s; 3- r)k rrazb) 9zeoxxe-qethe rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is tr*ap*/y:ie bl he 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 e +swj*0vbrj r;l b)i+is the resistance of the lamp+;)vr l*jjib 0+we rsb?

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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 connep0au - cy 0 kk,f:yg (i7awyl/w)*avajcted to a 120-V ac power supply. What is the peak current through the resistya)l*w/gy y,a - ak:0va7kufp0i w c(jor?

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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 supplvhr doksmp,s.3( frmo.m+d. j5 5g)cby. What is the power dissipated in thgk b3..m+hv5dmp rsd . mf5 jo(,csro)e 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 resistor is 6mau.vks*kk 9$I = 0.80 \sin (240 t)$. 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 resruv7km:koe 5q* kd/8 -(ecs kqistor 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 resib6 5xgw:yzxxclt: 2dv n(mw3 (stor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor jmsvxhl4ya3bm6(h1oe0 h : pcl/( 1svat 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 reactaff,uw6qhxk t10p/ c3u: r, xgknce 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 14.0 W of inductive revly g5ky; -(kyactance?

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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 1kbeofzx,e )x .q44 z+-v; apms000 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 )n+)mmwlloi 4 V AC at a frequency of 20 kHz is appllw im ml4n)+)oied 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 clh-((v x9un5ewzag 3 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 capv hhp0yw31p 5z*(/i bedcdbn 0acitor 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 capacitivi h2j1tx0sn y+e 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 capacitoro2l7miwuje: 6 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 reactance of a 0.01 8uu qd--h8vujhb cl ym)5:.hj:y m:ec0-mF capacitor be 100 W )8 m-y l-.uveu:h::q5hmyh8cj judb c?

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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 oo0aw0orp/m0o x6te/vwr. r25.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W r)a q5 ,-piihbnesistance, 15.0 W inductive reactancebi,n-pah i) 5q, 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-mH coil, and 1.0d g1 .btba:8ae-mF capacitor are connected in ser8 1e :bba.atgdies?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, j5 (t cpt*9mxuand 1.0-mF capacitor are connected in x pmjuttc95( *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 2l5dno, hxz dma9+ +r/k 2upq.z0-mH inductor, what is the impedance at 1l xnkahz z+r.q+5md ud/92o,p 000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is 3k.yqd nq*tmn95me(q the phase angle at 1000 H3e(5 yknnm. mdqqq9t *z?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needv 3wiba6sdu6j1vsplr/l x/ yp(6gwylf021 f/ed in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedardfl/26a0 3b6fpxyjlgv( w s6 pu1i/yw1v /lsnce 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 serie qta /tq+(-h-a 8qd5jrq3 cmgxs with a 100-W resistor and 15-mH coil to geta /+-3qqrxa ttq8-m h5(dgcqj 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 450-;dh ws+4scsr.9s 0c 2: y4dpxx*tmo wbmH inductor at 5000 Hz for a total impedance of 4st 0. ssor4c *x42cmwbhp+:w;9dd yxs0000 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 with8d10rblksm;r1e 0 wjrdv3:n,o-re:xk x )yb x a 100-kW resistor at 1.0-MHz for a total impedance of 15dmy1dn3:1:vjr0er rx8 eb)- ,wx ;k rolk0sxb0 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;s,dy bhpya/ -bw .zg, series with a 20-mF capacitor. What is the imped,hs/-za,d wy.bbg; y pance 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+y6(ewglc7b4gvciis bj,8t : kHz for a total imtsvgi bb8 yjgi c74wcl,( +:e6pedance 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 capacitor ,,q8nu;r r v q4,iifveat 1.0 kHz for a phase angle of u,fq iq, 8n,ve4 rvir;$40^{\circ}$?

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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 resistory u9u fuvz5ygj ubr02v/(l 7(gpib.es4;a c0o at 1.0 kHz for a total impedance of 45 W7g0uisu ;u04y25zl(je rv(bocubvf9ag p/.y ?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. Whattbkc5g/ wefcl(tp4d0 5vw- 2p is the phase angle?k 0(2tfbc55wp d-ewglcv /p t4

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil,4fzlu4qcxyxm 7e:7a.7tk* x e and 1.0-mF capacitor are connected in seril k eu474mt7yfxcqxe:a .x*7zes?

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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 resigprrz90. i:jswrst:r a pz3re59 /-blstor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 12rr/r:9z: 3p. wsb9rl0zgs tapi 5jr-e0-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 capasthas :4vbzm.; yy,+s citor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are conne4 bs+s;.s ,yvaythz:m cted in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC cb2 az299wvqw(bc evea8c: he5ircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60v9a vz5a ( w8eqbe9che cw:22b-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 necesfs.b /ncq ujgt4kf19)sary in series with a 500-W resistor for a phase angle ofu j.sg ktb9/f4qn )c1f $40^{\circ}$ 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, dm.wumabxkt- ws 1.v ib8vv4s157h;r L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum phu-mibtv4 a;wvv7w.8m 1skxb 5 d.1rs ower transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resis 1;a b.kh q/yc;oljigg4(go3xtance, 15.0 W injag;gxoc.(3i hyb;gq okl 41/ductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit iuq9ztv d*fass8y + )o8s $63^{\circ}$. 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 im/ gaf /oc 61ijep+mpd-pedance of 60 W and a resistance of 30 W. What is the powi f +/o6jdapmg1-ec/per 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 ci)9 x8eaj-em llwu 2bv1rcuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply9 bwj2avlx1) em-8le u?

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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 2 6p,omda8vu m sgkw+1and a 15-mH coil in series?vd sa1ogwu+2m, mp8k6

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is neededf* b8qyi7c.wg in series with a 4.7-mF capacitor for a resonant frequency o 7fyb.qc iwg8*f 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 3l+vmwruj/:6-u ,ht bi.7-mH inductor for a resonant frequency ofimbu-j+r vt/6l w:h,u 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, xd5ew fk*x0y placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the xxf,0k*e5yd wcircuit is to be 1000 Hz?

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