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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 magnetic fmvh3l t 8x-,eslux 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 tha83 ges/ya z:nv ;cwp9tvyj5e. t 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 p ay-l-tx ek:m3roduces what kind of change on th: -xl k3-eytame 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 field tha9b;, -1l7;us omh fnrb2ysjg rough a loop of wire produces what kindu7 sr;gb- m ols1;bh9n2j f,ay of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on9wk l;os 5v(bgt)vz d* the induceslzw9g)5 *vkod(; t vbd $emf$, 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 maey(tzc 7*t, +vs 7bry))p(exii:fhksgnetic 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 cm8 2lj wb5wxhhkz7()e rt-v/ionductor will28w m-5lbw(ez)x kvth hj/ ir7 be that 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 mag925trkj 7dmi,*y y lulnet is held above its center with its north pole pointing down. The stationary magnet2m*lyy9rt5 lj k,i7ud 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 above blviy* +y1(d aits center with its north pole pointing down, and released. As it approaches the coil, the falling magnad(bl1i *y vy+et 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 tk qjh h)s;o3-lfv r)4nhe magnetic field vector points straight up. The magnetic field vanishes suddenly. When view qr) onv43;-fjh)hk sled 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 wh +ncsd4slu u8)ere the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the dir 4ndsusc8 ul+)ection 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 horizx) 5kl/fwunoc5 uc7 -pontal table top in a region 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 thisl/c5 u c7wp5 ufx)kno- coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal tabla7-+rp :rxbim2 lx k* gs0mcr+e and carries an ever-increasing current northward. Two coils of wire lie flat on the0l+rg:cr*+2 7 am kir m-xbsxp 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 o/it)ax1 ti 4cul0m 5zbf wire with the north pole entering first. As the north pole enters the wire,tz)1/l50 mxauii tcb 4 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 rotated at constant angular speed about an axis whi e z wvc92)9)i:korihose direction can be varied. In a region where a uniform magnetic ciiv 2)w 9oz:k9r) eihfield points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an(:e -ma+rv,is(u.p9 nidj sx j axis whose direction can be varied. In a region where a uniform magnetic field points ste njsv(m(:psj9d ,u r.ax+ii-raight 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.wcncda5 ewu+ 4mbir)i 4u1k.+
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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 mk /.nlcmk/9d4.og xk$emf$ 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 magc 5,ya rc av6yyh2m/3fnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved no zeyfy wl)9 t0*35yhdrrthward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rodt3y)lre0*y9 5d hyfzw .

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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 ( cota grk40+v4m1dki rotates 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 generator mbap4n l7z6 /q vb ))a-:voai-6iii zztransforms

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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 fretljio,gmg/+9kh, t 0f quency of the / 9f mgt,lkj ho+,tig0$emf$ 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 us z* (gk.vivi5ded 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 dev+w5-h1,7g8g5ocjmv dm bo csgice 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 coil conta qtl,c 6nmf8 nxvgscd) 3d93pi/9a/egins more loops than the primary coil then it is a pftc3)g9qc/snail dv63/n 98gemx,d

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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 loohef spu/cu-7g 9j:mo kx1w46w ps than the secondary coil then it is weo1 -uu7 k/64fc9xpmg wj:s ha

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, th6(2dxasos r w*e power 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 cxqtb3ot tn : 5hew2rzwts(-.1 ircuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ide-1vxml6 5hu leal battery of constant terminal voltxl uvl-me 165hage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery 8,ygv,/a+rvf h; spsl of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inducl,v;rh/ pga+fs8syv, tor 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 reswyqww1-:fx ni, j y5p ra:01+ kxcj.b1n)ckghistance 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 resistan w3sy gyw65h)cce 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 inductoh8qv: 9mmsxh,dlc. y7r are connected in series to a battery. The time constant for the circuit represents the tid h7,y.m v9lxmc:8sqhme required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series t1wh+*ubd,t l do a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the th1dub t *+w,dlime 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 excepun*qbh3:uc5 mykw3v id6 y: w)t:

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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 .n0z* gvf :e6 qqd 2juhzyh)yu u,)fy9this 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 q 3e7xlro,5mzyb4.kz g:xd f+an AC power supply. In this circuit, the currentzk43 7g :.q xodbrexy,f+l5m z

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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 fa/5t a9gi2)xh 1dn rzhgctor when the frequency is tripled)9 5 1higxhzdrt2g/an?

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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 ac d7 npzb+iinfx7 eo9nxr o c:33.zh;k0ross an inductor is doubled, the inductive reactance of zxf.+ h3i :nbdr;97n 7kzo 3ox e0picnthat 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 across an inductor approaches zero, thujr 1:a. dli * 1koait)yh8q2he inductive reactance of that )u a.y8tj:ad k h1i2i qlr1*hocoil

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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 supplyx0rhjdz uo* k4 *m0lt5. In this circuit, the current mhk5x* oru*z0 tj04ld

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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 c c1qy/c9ek .d zhb(jl,hanges by what factor when the frequency is tr 9qldy(,ckj1hc z be./ipled?

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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 appojlxl(v1l av)(n1 15:udy q wjroaches zero, the capacitive reactance of that ca( u5 lwxl a1 ony)(j1djqlvv1:pacitor

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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 betweej anhvh7a. 6/vwzy:)x n the voltages of the inductor and capacitor in a RLC se.hw/ )hvv76a:ajzx n yries 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 circuitk iy )cd p-g755oeu cd;l38uht 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 impedance of the circuit increasdk5 )op7elrsa(me9g n+ i,q q6es if R increases. When m+lea 6,q7 eqs5pgok9n()dri 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 increasenk2d/ no(t81o; -sbukbr *x nds 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 imbl 2e03 yrhh9ncreases 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 donngdvi,q1icg w (r+-fe4kp84 uble in an LRC series circuit, the resonakv n4r,8 gd-gini(+1 4pec wfqnt 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 vo e(usn2du6e .qltage. 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 :kkgx/ ,sery (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 (qtmjs( a+x9g 3r,p gxa uniform magnetic field of 0.20 T. Find the a((9x+ggxr,p st3 jqm 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 rotating in a uniform magnetic field o wibg+b/mobpf :m/6; qf 0.20 T. Find tb bmwbmi+f//; :6gqpohe magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is ry1cbzzoj ge./ 5u( 6yfotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an 6zzoe 1cg fb.yyu/(j5angle 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 adjustacq7quo n3+ /fsy2 kel*ble 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 ,yobo87jcv6 q changes 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 sidnr3(gvlhq vy g5: z6y, 09evacw9ho-mes 18 cm. A uniform magnet3heyvmvaw6:9 r nvcghgy(zo59-0,lqic field is applied perpendicular 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 15f n.,p by30o r ku);tot1v mi6m5ipiu, turns 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:fs-ftmur t 2x2,)if av )o,yg 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 60 m flies horizontally at a location where 2u0uqj 0e 8uhlj /rn/ethe downward component of the Earth's magne8q/j uh/r 0e0uju2elntic 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 l.y ir;qa6 jeg hqodi4jz q+:0fu 9mu:5ong rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant m0u5i .hmg q6;:4e9oj rfadjuq: z +qyiagnetic 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 0,p7+xz r3xm irol, -hl5enw bhas 50 loops and a cross-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 consistdypjbs,ct0q 9g.h/ 6q s 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 it qqz/7y)2i m cjeal/s;rl8( hno/ rr0is armature. Each loop is 12 cm long and 8 cm wide. The armatu lirq0s/; // riqc7nze8ja(mhrl y2)ore rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 10b:wlj p*lf 66p 4hrd,,z lq1 oomx+.co0 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 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 cons0x xpjw2 ercpyu3v-r,n9 m)3b l7yg*itruct a simple AC generator with an output of 12 V maximum when rotated at 60yj - i3n) l rvpeyb9x37,w0*prx2cgum 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 maxiirv4ky. cf/.*i g;fbi;jlz f1mum $emf$ 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 Wlwy dw2 ,k/oi+. 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 motoyou .uo+; kf8hr have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at fyf+o.u 8o uh;kull 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 resistancusqflted/ e4, pn,; 8 vt+rcirf(b1h6e 6.0 W is connected to a 24-V power supply. The operating cu+;14rfqt t,bfvusciel/6hnedr, 8 (prrent 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 resistance 6.0 W is co93k6eru sn4w vnnected to a 24-V power supply. The operating current is 1.0 A at full speed. What is thnwkrs3 69vue4 e 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 to a 2-aitbv)/ q:e p1q lb;n4-V power supply. The operating current is 1.0 A at full speed. What ;a b)pq:e1 lt-iqv/bnis 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 v3+na0(oy 70fplxbi 1kr3uxl foltage 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 prcy17g 1uf lh4rl+ bn,kimary of a transformer causes 14 A to flow in the secondary. How many turns are in the second, 1+7b cg1 nr4ulfklyhary?

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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 inu(.0k 1iysy nm a 110-V primary if the 24-V se(ns.k0yi m 1yucondary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000- i;m/k rk gutt(a 72qudw;xwhb.3bt7(turn secondary coil. If the current in the secondary is 3.0 A, what is the 7drt.wi/(qb u2;ukmhg ( 3xwatk7tb ;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 t uf8x/qogz9. :yn2 sdahe primary of a transformer. Assuming 100% efficiency, how many amps at 24 zo q8an2ud9. xfs/yg:V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at nqzs34vwb j;a mg2-z qypn 445 tr6z4z10.0 mA. The primabz 64nzw5ytzr3m4;aqn2q j v44pzs g-ry coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 tw geh5grcfa37 :l(dg*s41 ck )qo we9aurns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is prodahcg g sf9wkg1 7a53 *rle )(wc:q4eesent 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 60 tuo6: o x3jo59bohe us7urns on its primary coil and 300 turns on its second 35u o:eoo9xu7s j6bhoary coil. If 120 V at 2.0 A is applied to the primary, 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 sec r1 lp9xo2ks6wondary has 200 turns. If the input current at the primary is 100 A, we can ex p61 ks9lxowr2pect 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 u4r mw2hja.el z kk thsl8h0+;58 qj.jand its secondary has 200 turns. If the input voltage to the primary is 100 V, 5eq+j;.hukzsj4 8w8halj h.0lr k 2mtwe 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 transformer has 100 turns and its secod526jk gbko1jd8wcq3 ndary has 200 turns. If the power input to the prk 283dw 65bq cj1kojgdimary 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 A of current at 120 V. The voltage isi+ bmv6p/d5i j2cqi 0u-ae0h9) tfd vi usually stepped up to 4500 V by a transformer and transmitted through a power line 0c-adi u/ti 0b 9i fev hv6+)jdq5pi2mof 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 curreid8tgeca0z 69ut.i lt. osuf d;2* udu4b-*ymnt at 120 V. The voltage is usually stepped up to 4500 V by a transformeza2u68-c l9d4 u.myd*oueus0ti.d ig t*bf; tr and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120hudhzaw- x:/3 hi :vos1q. 3rg V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up./q.o3d: hh g 3riz: w-sh1auxv

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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 50a rd/n9zts7.n4e (e+leh.ghx km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce ener.7r4zxlhetd/age s+.n 9h( ne gy 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 tf7vhe u4i7:u 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio o4t7ue :7uhivf f 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 wouly ra9 4+dley9pd be lost if yp 4eal99 +drythe 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 Vv3- ,z /tia0 7xgjomjd3. drjd at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in xjzgtmddr33. jji- v7d0,/aotransmission 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 sq b6sz.:nxbw7 tored in the coilz.bx7n w6 :qsb's magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. What is th br*(6wb09 bwexvtesfw4(: p :ei(sddis 9:bwi*( b(w 0bd6r4edsp f st :wevex(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 the rms voltage is6h vqmq518 x8bpfy )jd 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 Aln.;x4pnx9vme-( qu sC 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 th qx96b-*cuvdue lam6qb*u dvux9c-p?

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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 powe/rs +bax 8m*gtde7-xbr supply. What is the peak current through the/xgm 7xd*st8eb +rb-a 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. W4b gv9.lhz5asuo 4 rt3hat is the power dissipat.3sl g rvh 445bu9ztoaed in 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 wa8ed(vy9xi 4 9 vg3e78vtyup 50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor v6k *wkkft8u (zmb u,4is $I = 0.80 \sin (240 t)$. 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 isq51/wcd(wpvyu l go i8e)i2qpv53,q z $I = 0.80 \sin (240 t)$. 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- b8ai6g:59ks ydmbrq*s f ,:rlmH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1000 Hh kk3x7*0hxi jz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency wil;,; yh+zpgawc+gggszz go. s 14yv/*bl a 14.0-mH coil have 14.0 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 inductive reactance at wdpzx/y8e*4e 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 1kc1,s-zd+ j fdhck20c*sk/q knp7y w620 V AC at a frequency of 20 kHz is applied jkshk- dzcw02 k,f*qcd+1/y7pn 6k sc to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a m,jn*+ s e55 ojy)e qys,od+vl110-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 k dspdfy,a5 6v1Hz?

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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 capa :6xjwurjsa hadqa/y1mk+68 0+jjdh(citive 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 have a reactance opb(m hcyf;1/k9ktzt( f 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 0.010-mF capacitor be 100gralyzv (r ,++ W?(ylz vr+ ,rag+

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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 tbio7r +d2gh::8w 9pcn+kmyx 4 ab +uqqhrough a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W 0,.o v ddws0wdresistance, 15.0 W inductive reactance, and 10.0,0ows w.vd0 dd 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 10 u+ o m qwmue.a37 .*9bw,vr78ybhkbgp0-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in +wa*w7b9oq .y.uevp bm38 hkub,mr 7gseries?

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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 resipw j- v.+wc zx7slak/bc(d: *jstor, 20-mH coil, and 1.0-mF capacitor are conne+ds7v/-( j bp:xw*. czlwjckacted in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 2th):iii0.bt p0-mH inductor, what is the impedance at 100:ii. tib0hp )t0 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 con.d ufjo 8 e; gog1-,w g:sluhuki5+ow-nected in series with a 20-mH inductor, what is the phase oiu:.g1,ow ug oj+leg-wh8uf -d;k 5sangle 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 seridrl e) h a,vhg6y(mt-(es circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 15dy gt6l vh (re(,-ha)m00 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 resistor t4fklsh +/syi/ggbze dysg+;:c43 ,f and 15-mH coghbstk/ s;fsfglzg 4/ 43++y,edyi : cil 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 alqeam3jiu 9ol 9i3(y ) 450-mH inductor at 5000 Hz for a total impedance of 40e9uqio)9a y 3ijl3(l m000 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 wcf d*-fb+hur a+7: sl+d j6ziresistor at 1.0-MHz for a total impedance of 1+hu b:c *f+ idslz+a-7f r6jdw50 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 the efujf ,x29wr.pn l- )zq*fbztxi 5,v3 impedancpjxf-zw23xf) iqr 9 v*,, utf.enz5 lbe 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 neiyh zk+8t2 q;h0l0plgeded in series with a 10-mF capacitor at 1.0 kHz for a total impedance of2lh0gl0 yh; qtiz k+8p 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 1x+u8kyk4 ar s30-mF capacitor at 1.0 kHz for a phase angleya8k3 rks 4xu+ 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 needed0(ch bit* io1x in series with a 30-W resistor at 1.0 kHz for a total impedance of 4oi0c (x*bhit 15 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 series2bju2e gtp4f2 with a 100-mF capacitor at 120 Hz. What is the phase anbt2 fg 24up2ejgle?

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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, rtdn7(8fezr c q9fnt ,,en1o4i.;ie c20-mH coil, and 1.0-mr rc ,i eocf1z,dt7(nn.ft9e e8 i;n4qF 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 gb/ u3zp/ci, mcapacitor, and a 0.350-H inductor. The circ,b3g/pzic mu /uit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactanceb-s(am5 a ,r-mk -jgmj 30 W, and an inductor of ink(5rg s ,mambj-a--m jductive reactance 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 series RLC circuit contaioir.rj9x pmp n0-zp 56ning a 50-W resistor, a 10-mF capajnpmxp oi5z p0r6. 9r-citor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series jofn kgw+a6n/k xa ao61kf7 1/with a 500-W resistor for a phase angle of/f7aoj n+6x1 /fakk6nowg1ak $40^{\circ}$ 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*m jk juesf 3j0kqy007 what frequency should the circuit be driven in order to havem*k e7j0 q usj3f0yk0j maximum 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 ac series circuit wivltptczn (yz*g5/2 5v th 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 1n5t(zv2/vc*p lt5yz g 20-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 circui 3*rwk: yy.qtes6;sov t 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 wikaiu86k3/lz . .mmhd3or8 b of 30 W. What is thel kmd.i.bk 8umi8ahw33o 6 /zr power 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 circui,(h unmjvux m f.27:kw-wfbt: t containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power su.-:whm 7bf(nxkvf ,wjmtu2u: pply?

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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 ca /)l.a* ksknq/(stuap3 l zn1vpacitor and a 15-mH coil in series?qnkalkz1u3 a (p.s s*/vt/l) n

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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 wo;* 9/m6--m j oo/eyyh g8grxazkb a:oith a 4.7-mF capacitor for a resonant frequency of 10 kHzxo6 omyay9m/o h8b; -jgrk /:za -oeg*?

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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 inducbaq /f0e+cugye / 83+xuy+adm tor for a resonant frequency of 1000 f+ /ayeq u axy8c30uedb/+ g+mHz?

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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 placiz z-d-yeer yh:kzj 5t5b34(hfj o g6.ed in series with a 30-W resistor and a 40-mH coil if the ref:(g 63hr- y4-o.e5yizhzdjk zt5jebsonant frequency of the circuit is to be 1000 Hz?

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