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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://autodiscover.51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 80，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://autodiscover.51fly.win/test80.html  教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。
 作者: physics    总分: 142分  得分: _____________

答题人: 游客未登录  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 magn cx9 9ayjpgbe/ pb67qujv7 8/u 1kavn.etic 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 the l,j6r:kygq l:$emf$ 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 wiregsd i 6j)+9bnc in a coil produces what kind of change on the dn)+i c69gbsjinduced $emf$, 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 ma65ayk 4fuq)n wgnetic field through a loop of wire produces what kind of change on the 6fykanu4 5)wqinduced $emf$, 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 ofdk0ima4fk ths/wm v; :*2sz)l change on the induced hwfv )d/ m;mka: t*sslk0z24i $emf$, 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 4ggijj z-(lm(rru-k5 magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conductor wilk vhw3h8+1f2buw 5 4mgn07znw/tyfoll be thvk/fo fw82tbw0 n+z34ymu7 nhl 5 1gwhat which 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 magneq 0eb;kqa2.+bmgqmw .t is held above its center with its north pole pointemqw2+ qkqb..b g;m0a ing 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 on92g.k tjkirh;r//ctz ua: .pu a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. k h rk:9paigj//.2tctu.;ruz As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnzoyu0,m/2mhek49(r z u bqw;ayjf h*0etic field vector points straight up. The magnetic field vanishes ob*,kfh/aymh9 y (zwju q0z2mr u40;esuddenly. 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 a region where the magn ybbvus0s514getic field vector points straight up. The magnetic field sudde0 1yg5vbsbsu4 nly 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 in a regiopws k26c* lo8dn where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil6*po28kslc wd 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 horiz (s- mw9 wwk.uar*mvixsazxn:838m *contal 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 from xw xcuvs :w8w*3mmir(8a.akz- * ns9mabove, 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 pj3p1 prlg lkni16h1)j ole entering first. As the north pole enters the wire, the induced curl j)1j3r1pi 1pnkg6lhrent will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at cod 4xdrwlq wqx:()wrm*8 0(ieanstant 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 rotation if theqawrxd: qil4r (0edw)m x (*8w induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis(fhqsen+-/ a hw5ov)z whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be ( 5sa -q+hwonh)fz/evthe 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.q f 9p49jnrws-;wtt6gv *.q pn
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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 thak ht/ka))p; wft an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic fiegt6ge jibus60 )aoj4;b.yz( wacrvg l7 )9j;bld. 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 easfit dv+h-dp 43t-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potentialp-3 +fi 4tdhvd induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a c0:99o 9.32g dpmd b yunlqf8ap40/rvvnorkxxonstant 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 trymf ;qig94w7tansforms

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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 th3lmgb47p ll w6rough 60 revolutions each second. The frequency of thegm37 pl6l4lbw $emf$ 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 derbxnofk2 54b;yte. 9 uqx4jp6vice 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 deviceboste f6z4,5 k 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 sex 8td26r.t)hjsx yz bu-j+ qo*condary coil contains more loops than the primary coil then)to6u*xr +y -.jtb2 d8jz qxsh it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops tthhae kt-y+c23vjbp2.8b c q /han the secondary coil tc kv.qbt3a8p2 e-tb h/ jc2yh+hen 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 p q0f 0 yvy)t.7 *c*ckrhhs6humower 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 ci2szjbrwf ) cs80 /5rosrcuit,

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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 connecth nmv sn7,i5t4ed in series to an ideal battery of constant terminal voltage. At the moment contact is madem7 i4h v5s,tnn 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 indu5 xqlsn4ton4sjhd)( 8 ctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltanh5n d8qjo4 st sxl(4)ge 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 witdcm55 .yh ;8g8fix eikh inductance 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 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 rel s6d:kpqko ).9ne g(ksistance 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 h*2 ih05zlwgbare connected in series to a battery. The time constant for the circuit represents the time required for the current05bwzg2hhil* 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 arv8xkw9:p h-/pwgw/w n0 /wssa e connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the timw/ h pn-w//wsawvk s8wx 9g0:pe 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 have the same units exceptvol :)vc2*);eg,lra q-ol sek :

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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(z w fupq2ce0k(2q j*z AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. +wrn2 rpy/c/s In this circuit, the current/2 /rwnr+pc ys

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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 ,dl6/oi0k rj 1je1kcr factor when the frequenckc6 oj1j re,il0d/k 1ry 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 9 ;nac,8undroacross an inductor is doubled, the inductive reacta9onrc 8d; nu,ance 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 v/7 szv). bs k*,ucvzk3f*9u yyeg weo:oltage across an inductor approaches zero, the inductive reactance of that ccv/fky e*,3busuv7 o. :es*zk)w9ygz oil

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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, 2emv7 .8d 7d*fcwurw8dv4k:r5lopjo the current fw 77l8d.4vo:5rk8pdm cjewdu2 v r*o

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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 au eshyqk3ktv x db/.) 9;29bd27ftmbmn ac circuit changes by what factor when the frequency is tripqd3bmk/)2 tydk9b 7 2hxebv;tu9ms.f led?

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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 approach(1u jg;g(w(zvkzq (tues zero, the capacitive rg t z(;j1(wzkqgu( uv(eactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle2 3oqmj.tx+6-f mzznn between the voltages of the inductor and capacitor in a RLC series circuitj.m z6-qno3 2fm+nzxt?

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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 cio5db9uz((mz nrcuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedafxcza)ck )v w** ,aq8mnce of the circuit increases if R increases. Whenfavzmc,a8)cq k*w x )* 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 the circuit increases if -0h89 gfpmld-z) xrt; ujh0wf$X_L$ 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 12obw 6z) wwj-3vz(kti rgk3oif $X_C$ 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 Le6::z* +cjm)ib pkiznRC series circuit, the resonantib6zn*i cj:k)zp+ : em frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltagwprn(dpu 1d 506s7pye+rs d2 /qko0hle. 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 circuitbmm 6kq ya5i0; 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 r2*qkau kuz4w0th: xod 9/7cvn adius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the tv42 wxzc9 qhk*auk d7uno0:/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 rotaedx(lmg:g e/ z;70ezb ting in a uniform magnetic field of 0.20 T. Find the magneticzed;ezl/e0 x:g g7(m b 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.++mx rdzk j6h/20 T. Find the magnetic flux through the loop when the plane of the loop axh+m6jkdz+r / nd 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 adjustab+qp(a ob1 3 taf/q oes)k9b4ysle 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 changes fr:be; wa;jr2erom $4.0 \times 10^{-5} \; Wb$ 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 turnsm srif+;q1idj9 zf,z s:s: bn: of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. Ifmssfsd9;i fz + jzrin:1 b:,:q 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 turns and 8s7qpi;z:anl1buu t;z0 st (y an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and area hfnb o-px/6 h:-:5:tyigs hc f$0.20 \; m^{2}$ 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* k8-eyjc7 lzhwwwz)4 m flies horizontally at a location where the downward component of the Eawe8 74cwkwj )-z yhlz*rth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant a om)uk* 9*qkglc0: jzsngular velocity of 2.0 rad/s about a vertical axis through one of its ends whikzo c*lkj0)m9 *qu g:sle in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional area of4:oio e13hqc re+2(n(rks txd $0.25 \; m^{2}$. 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 o34tvh8*fleue) tc f 4rf 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 rec1k;. f fvo7qnjtangular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm abo.kjq 7fv1;f nout an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 t2 2o5myo/ko7uypba j5hloak71-8a e gurns 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 s0bys oa -kvl1-imple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area--by0v sk1alo 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 9j-f,7sba5)b ,kzlazct m) xggenerator 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 resistancemz d1*ru*z(q8zfy4 rj of 6.00 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. 9 :94aiyk6qlmbv uvn7aung;c 2g ig9: The motor operates on 120 V AC, and when running at fuibk99c vmy l:anq;g2gan7u :6g9iu4v ll 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 2(6:iqn)/cl(mda3i dl+znia g 4-V power supply. The operating current is 1.0 A. What is the start-up cudc(i3 )il+ i/nln 6a dg(qa:mzrrent?

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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 W37edrq9n 5jy/ d)vngb is connected to a 24-V power supply. The operating current is 1.0 A at fuv3 )nngje brqdd75 /y9ll 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 b ej 8y0ukdjy7rof) e8k11t* vW is connected to a 24-V power supply. The operating cuejobufkv8tedj1yk8 7) r0 1y* rrent is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed t /+uhk qrhb:b m vo2xsp9zhf0/q68- elo reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transnk*.tf 78 l(y qg-zomhformer causes 14 A to flow in the secondary. How many turns are in the second.mfto-7l(gnh * zqyk8ary?

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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 pyaq0 d9jiyu2i*ky+g5 rimary if the 24-V secondary has 1jy yi0q5+kdg2 *y9aiu00 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 r c9ck 0mwomfeig:w:d0 l+(2uw+w1 jfa 2000-turn secondary coil. If the current in the secondarw (uwk+j morc9fwg0wl+ fiec m0::d12 y 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 ow*ea+xa:b,n egdd vd,2gw ,b 0f a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the sed,+,d e g2vaewdw nax:g0b* b,condary?

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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 si.,ah cc0zag d:4ipov1gn transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What d.dz gi1 avha40cop:,coes 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 60qb6k buf6+t91kctzu oex/2 z; 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 secondarto zukbx9t2 b/1zu6+cq;6ekfy?

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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 de*yrk:/-a e;wnwsj 0its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what; nd0r- wj/keaswe:*y 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 hasf6s:f1 :duk yl 200 turns. If the inps::yudk ff16lut current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 20 e)aar1 s(c7ox6 7s,xudop7uiv7hz ;h0 turns. If the input v7v 7167ada7soe,hhxs;c) zix ( oruupoltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformertr.achpy5s8lw .1j8 i has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the seconiy h5l tprs8.1.j8c wadary 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 avg(k b+(u)zzwt 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turng()z(wkzvb u+s 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 voltagea092 rxsossl5g(7 te.vebrw7 is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W.gst ra70eo 925exrvbs7l (ws. 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 cuimi w1 )3ioo7fl+d-xr rrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the pormxio-) ii 7df31wl+ ercentage 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 res6n. fa camqqu- c/qk9sj8y v,r o2ti-,istance 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, t,ik6ar-q.om 8qnsq-cuy9 f/jc,v2at he 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 resifr8a qclx3s.w*yhwi579 +d kpstance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with apd3a 57slfcr .i+ 8h kyqw9wx* 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 1004f)lni0a,t um c+xlu00 V. How much less power would be lost u)mix,cnfl0t4+u0 l aif 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 2ik5 * rskzfy,/n5mbu)0 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power losmy5fk*isrb z/uk 5n), s 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 th . *3wkp j5r0hasbnx:9uce0jw e coil's magnetc5jw.x :n pu*rs3 e90 hjwa0bkic 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 lm f 5nd2,9vk3z7uwx+*noewya u*xf7a 6.0-W resistor and an 18-H inductor. What is this circuit's time cax* 2wo3kmfd ux7z+lnu,vwfy 7e n9*5onstant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 120r/3x. d +8lbqksmym6 g 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-Vacpbh,4s46rz lfwm06 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. What is the resistance of the eqc0aw62:a geluro o naaogf9/-g6 b3d96q9e lam9a2o966:lu/6onfaw9 gegae3oa-0 b r dqceqgp?

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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 supply. Wiupv1 y389y pyjgi/ kgmet29(hat is the peak current through the resistor?p3iyvuj 1y mp8giyg9 t9/(2ke

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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 12b9d7mqlpzqf(- 4 t2d u0-V ac power supply. What is the power dissipated inql(9dd f tzb42 q-7mpu the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 3itna yu x1 -mgr;,f+t50-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 rg- h74ge ps7swesistor 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 resistwpe+ -9)kv ofbor 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 at 6-:lzu9k)6 c;hd perc sadukb*as1 6e80 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 onnp1c3b0mkf 2tdt 0;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 ik 7yt.w (8omplnductive 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 ofm/osxhu*y. 8. 8aq; pz7dshgz 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 in a 60-mH inductor when 120 V AC at +jn(nqo.t4pr a frequency of 20 kHz is appliedj +(ron.tqp4n 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 9,hl s -npnb8j2.50-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 stnmz0b1e(g ;6jd.x 4o hu zgiz;k;7 ca 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to har*r;(l ;xnb )b8jxjzrf iyi* *ve 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 capacitor h tmluk:*z z+uzzk69 mk u7 (p95jy,ymyave 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 0.0j *v kn,ew - *artn1x9lv8qw*10mk .mg tym1fh10-mF capacitor be 100 W?m,* w-t1x9ghe*18 ftlnrkmk 1nwyv .0j qvm*a

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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.u4 jj14vsp)-ndo w dc+0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuhu44f 4kymzd,it with 12.0 W resistance, 15.0 W inductizmh, ky4f44udve reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance l dgy8cf 2-vu5at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in sefl85 -ugdy2vc ries?

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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 100l-i ulqd3sh9;ay 0oo+bv3j w2 -W resistor, 20-mH coil, and 1.0-mF capacitor are conl oq0i3hyj2vs9-b; u3+wl od anected 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 cy5a(/du b89-fcpwpn.s plg1e03svxv onnected in series with a 20-mH inductor, what is the imp 8vp 9/e5sxasl.31w(pnb0y guc-fdp v edance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mrtg6 j*j525x llvq *dmH inductor, what is the phasjj lr*6*gl2 mqv5t x5de angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series c ndjxxlira*g,)ef1wa- 6 sd*pt (5rh0ircuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of-p6a0)dh5xdx* sgt *w i(rf,rn j a1el 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 s 58mbj2axf f-:em- s,8btxh jneries with a 100-W resistor an-2j8 -bam 58xh,xntfsje:bf m d 15-mH coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for awtbk9/a 5p :bv3k tc 6avj *j7izn:m5a total impedance of jviv9*kpcwa:t b 7zbam/k:ajn53 5 t640000 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 -5 3+fvjn vxg*, ,ps3ewk j99srmayzh in series with a 100-kW resistor at 1.0-MHz for a total impzpvsk9 5yvrgewmn, 9*f-+3 jxa3 h,s jedance 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. What is t hf yua)w35f7khe impedance aty3u5 fawf )hk7 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 in4 ,xh7k( cn;xx7das pq series with a 10-mF capacitor at 1.0 kHz for a total impedance 7,pxsqkn74ax xhcd( ;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 capacifv 6fi jb8l-h(tor at 1.0 kHz for a phase 6hi8f bv lfj-(angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for a ttk;o1 oidu 6+lnk- p(motal impedance of 45 W?n;tk6umo +ld ki-op(1

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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 Hz6co+ely(: tcj2 c:0+ wkmbbjw . What is the phase anglbm(c :2j job yccwe++wl kt6:0e?

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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 rq,e wg(dy4)n +c uez9iesistor, 20-mH coil, and 1.0-mF capaew4gqn+ eyc()9uid ,z citor 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 xv d5gs+x0x r+consists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz 5gxr +dxsv+x0power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an , n7n9czm9-12f2c f wjarg d p 1bpsbi+h4i0yginductor of inductive reactancp sgan2294c+nw dm-iicy,h1j79gfbzp 0fr 1be 30 W are connected 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 bhqw kv g,7-ym 568 bjgjo3gpin*bj7/ series RLC circuit containing a 50-W resistor, a 10-mF capacito6bjpjb8q5g-o ik3m y ,7* /nhgb7j gwvr, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessa wm2g j./,kwqkry in series with a 500-W resistor for a phase angle of /w2 wmq.k, kjg$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequencyapz b ubo(0:,m, )uyl ze0bt0o should the circuit be driven in order to have z00( bble )u yzo0bp,o ,am:utmaximum power 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 ah5ofix +-y sn4c series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactan-i y+sonxh4f5 ce, 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 A58 uuh1tyts xhl1f:e+l,jep 4C 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. k (0p+ysimk/n What is the power f/ps ykmk0 +i(nactor?

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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/kpfbb u0)u z0 RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connectk0bubf pz /u)0ed 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 ca4nsa9 4, y qani+ce(kqpacitor and a 15-mH coil in series?inn, y44cksa(q eq+ 9a

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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 capysdp..p 0kaw ,7mfar7)+cboj acitor for a resonant frequen,f0pp b.ca+7r 7 wd.)aosykmjcy 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 wix0tfgm(fknyw v4z9 ik2y( b ,3th a 3.7-mH inductor for a resonant frequ (tgm92 0vfknw fiy,zx(b3ky 4ency of 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 resistor avw b;i(nd0 /9n4u b6ypttu.ihnd a 40-mH coil if the resonant frequency of the circuit is t 6yitp(0uhv/bi;nd.ntwbu 4 9o be 1000 Hz?

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