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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无忧得胜-网上国际课程 (https://5edu.win)， 为试卷打印版，您也可以在网站平台(https://autoconfig.5edu.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://autoconfig.5edu.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: admin    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 flux exce1 +;5 1qwhk t-idfkkjrpt

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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 hpf+0t6 kze+3s2o*h pv/niputhat the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of c:6ny +zfjxv ad29 pnb5 d2y7vrhange on the ind9ydn5x22 yajv z fnp:7 bv6r+duced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire pnkja2 f bi hw3z48,((xzgbj5 yroduces what kind of change on thex24(f i, j5k 8(wbn 3azjgzybh 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./fw bohaw2 og;fd9s: change on the indudw ;w9 :ha /sofb.g2foced $emf$, 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 m-d32*yim2 ( zfv/ytg ,crj9u -azwlmsagnetic 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 directivb6vumlf )ayq3 w/3k-4(*s1 j bohwsr on of an induced current in a conductor will be that which tends to produce h6o-bwybr3ua4mvsks)l/ 1q* j3wv f( 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 vb4y/w. +j 02sqoni/j s p/qomhorizontal table. A bar magnet is held above its center with its north pole pointing down. The stati+jwij. 0nv4os2 moqqy/bp /s /onary 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. A5b ndyrh8fesj *ia10 rk9n2f. bar magnet is held above its center with its nork9fi8n r*.hne ds0yr5fjba2 1th pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where*bkcj95x x6 bz the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced cu9czxbj 6 bx*k5rrent in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic fielzcyc7tl n6z4-+bv3p5vl:ba gd vector points straight up. The magnetic blcvb:+5 -t 3pc ag7zzl6 ny4vfield 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 in a region where the magnetic field 98j,g ev6dft ypoints straight down. The magnetic field disappears suddenly. Whej, gy8d9f 6tven viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on 8nekch*hj tx ,x0oz3h.y; ,necfi-o 9a horizontal 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 f,f ezynj;n*xc e. 8hho0 -c 39hkoitx,rom 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 z-:g (kmf7z innorth pole entering first. As the north pole enters then-:m 7g zfz(ik 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 rotated at cons(rxkt(l)*ij z tant 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 rx)ji*t( kl z(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(sg d1giamb1;c2 f m9n rotated at constant angular speed about an axis whose direction n g2m9 d1fg;cami s1(bcan be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the 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.ac f/b -nm-g lg.eca*4
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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 thagfxz0h ;1e-h l3awx/lt 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 matmqp3 6,)2efzh8 u:hcabs q .wgnetic 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 northward 6hv9 u::3f0i/avhx+midxb lo at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.+ lum9hvfihda: vi/b:x 036o x

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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 constant angular velyy mw*zr4 x8 i5 di4p-waun.k/ocity $\omega$ 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 trq faz fmn1/2;z .d9 *dgdcxt9zansforms

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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 freqf r.x 1abgxx3vmw .c4*vn 7j1muency of the vx m.v14xxg*wr a.b3m j1fn7c $emf$ 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 4gn8s*tymt(-k2s lcm ed 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 devb8zot m c 0a4)ka+,mk;8h dsptice 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 k j)ltcchuw3ner z.7cm:2( 7scoil contains more loops than the primary coil theccm:kn 2tj7use3 c)7wzl.( rhn 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 than the secondary cooafx f . 27g1n(jyra)fil2 (rfjaf ny fo.7axg1) then it is a

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本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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 power jd;dglj :ekd */7.cer 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 resonantc,g7 m d-d*acb circuit,

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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 agu yd5vgt 5fb8 07cz9zre connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, thev 5dy8zg5gtu0zc9 f b7 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 batteryx d,0ggaytv k) 67(zdr of constant terminal voltage. At the moment contact is made with the 7g(kxd,ydzv )tagr06 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 inducta76wp1esm f,)d*kcv +gpsq p/s nce 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 withpw ,b9 gp0qoa0 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 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:y:d kht g w6,)k4n nqbqh)im* connected in series to a battery. The time constant for the circuit represents the time required for the b y:)wg,4kqi d*kn h:mtnhq6)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 connecn 0b)os4gfm o1 7qcvd(ted in series to a battery. The battery is suddenly remove(d fv og01nc4)qso7b md from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the gk l.8gq-,;pdnrs36 (ync ahz same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On; .dx)zruaz(h; b f*my2xb p7h 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 b13pw b6 ggcopf(6 d7fAC power supply. In this circuit, the currenob7 g(p pf3wb1gf6dc6t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the f yz.r: 88 i +vxey+mcmmpujl(+requency is tr 8jz ylr+(u .p8mm+xc m+yvie:ipled?

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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 acbzxs )/:7q7a12 9wbj o4 nltvccej.biross an inductor is doubled, the inductive reactance ofzb)/oi:qv.27cc1babsx jewt 9 j47 nl 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 voltage across an inductor approaches z bp+ tjl,1igi+ tw7lc4ero, the inductive reactance of that coig tl4+1,7+j cwpiil btl

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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 anj43 m4qz 2p,ehy tpfu; AC power supply. In this circuit, the currezq,hfpp tu ym44je23;nt

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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 what fac 0 m)slsh5ylcebh,qy ;z z(741f)aabp tor when the frequency is triab1 5 0ssh)c7am yqzb, hllezp);(f4y pled?

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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 volta sv3/ itsgk58faeo4 0nge across a capacitor approaches zero, the capacitive reactance of thatovetnkaf s385s i/ 0g4 capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltagd/ zv 0q7ek3.ruwo)lkes of the inductor and capacitor in a RLC 70r. w3o v)/kudeqzkl 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 RLvc4vr7w -xg0;pdd 2 zoC circuit 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 increase0t siy0pmq3 g;s if R increases. Whent 0;q3imys0pg 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.a*k )ibkbh3e.;9-pg uoyle v circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedan 2o+:z (qdarpyce 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 LR4k0p gvpkv(46dolh e0 C series circuit, the re0v6hkv0gp (dlpo4ke4 sonant 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 ihs;ik-(9 m evf(g*qx xs driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs whm88 3x(ykd;2wkzpn-tsjl*z z en

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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 b .xxhzi9/4 jmfield of 0.20 T. Find the magnetic flux through the loop when thxmbzx/h9.ji 4 e 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 pft.8y4/;e+ u .o o dd2+dzrfxgx2mizrotating 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 perpend 84d+deo+ z f2ixx du.t2.mf/zpgoyr;icular.

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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 bxt;/*ynml8g r,o. mvrotating in a uniform magnetic field of 0.20 T. Finxor/mgv,tb.m ;* n8lyd the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced fr gojf(+ohm62a om $1.0 \; m^{2}$ 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 from tmp5spgqi;:) uhx 58l$4.0 \times 10^{-5} \; Wb$ 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 1bb bad,: : w5pji1rdl58 cm. 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 8.0 s, find the average value of ,5jdbb r5pd1:wil ab: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 5 l5/b l-gyoaeqdl4e8with 15 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 anl3n2 sim +xln4d 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 flixapb0lid0/z) tf6vzo( /b e)s es horizontally at a location where the downward component of the Earth's magnetic field ie0(b bazv pd)li6/)s/tfzox 0s $6.0 \times 10^{-5} \; T$. 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 cons ph(0y v+pv(l 9nff(tmi*6d 9fd0gd fktant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic(l*vt(( f hdyfdfp gmn0kvp9+if 9 d06 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 of hvq5h zn -n03f$0.25 \; m^{2}$. 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 turnsu;p9mhk; f.x6b 3sjqc q0l.gt 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 )ry p)) /bsum m6btge+its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm a/rb+ tmup 6mbyge)s))bout 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 tq2gbr h xf +2kwdq2,2kurns 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 t8 n2, tl slli8+ntx)kko construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetik+xit8tn )l 2s8nlk,l c 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 maximum qh*s/x 4xzuki-b qhxr 2(3.rm$emf$ 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. The mcsv ot9nj;k/a+/ r z-zotor 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. The motor oohhm c*( 3l-: 2osuagiperates on 120 V AC, and when running at full spees uah(oc o*: iml3-2ghd 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 iscx7+vapln(86ldkk)t connected to a 24-V power supply. The operating current is 1akd tk8l n7l6x(+)cpv.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 coqn-qj+ zw24px nnected to a 24-V power supply. The operating current is jzxnq 2 4+pw-q1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V po0tyv 046*cx pjvh- f6ivt,s hfwer supply. The operating current is 1.0 A at full i * p0j,-v64 fvtxshht6c0 yfvspeed. 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 tot ;rulgn6ub o3;jz.nbdf(2(u 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 transformer causes 14 A to flow,d02roborma , y:o.j0 hft7jj in the secondary. How many turns are in the secondary?fym, 0ro.b o 720jhd:ao jr,tj

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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 i(3lmuk9 w:*m (hqdzxzn a 110-V primary if the 24-V secondarymh:q9(uk ldm*3zzx(w 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 20pq)pb :r1h s*l00-turn secondary coil. If the current in the secondary is 3.0 A, what is the csqpr:hp*1)b l urrent in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. oxa9i1f6; ip.ygm4b k Assuming 100% efficiency, how many amps at 24 V can flow in the m1 b4opk6iaxfg.; iy9 secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. The2zm b7x/csrxl2jnfg vn66*) i primary coil operates blvzinc)x7s /fnj g2rmx6 *6 2on 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 it8j- ucho8j4dq4 r xufd8v 2r:ms primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage iqjmr8-28ocxv j4hr 8u4udf: ds 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 60 turns on its primary coil.1mlga yt6z(yv2ak g nek0kgo 7br (91 and 300 turns on its secondary coil. If 120 V at 2.0 A is ea7t162gmbkg.ynokz 1ryvg9 0la (k ( 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 ajf/;z *dn 7-3szde mu3gds q)fnd its secondary has 200 turns. If thg*7d-33fsf)zzu des mnq/; j de input 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 sec65o*xd/t;cd2f(d)mran j j4i ) sb zvoondary has 200 turns. If the; djm2x/4dbod*v5tfij(c6)onza s) r input voltage 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 transformer has 100 turns and its secondary has 200 turns. 1,gntyst.f16dygyshp, c o12.vb mn4If the power input to the primary is 100 W, we can expect the power ooydtvny,g6bs,gn c.pt ys11m 4. f 2h1utput 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 ut ib kne(3;gjlie bq 8z(1a4a1sually stepped up to 4500 n ial( b(eia4bk;1ejq31g 8tzV by a transformer and transmitted 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 l8xqv+0v7j u/-v jkep is usually stepped up to 4500 V by a transfor- / v 0l7vu8+jevkqjpxmer 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 producesvtr 7d-okg9j by7 8mm/ 60 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltageo-v877d k9 ymtj/b gmr is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. t:3wb: fwv6-h 3sv ytm 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 of 100:1. What percentaf:w3w 36 ym-:tvtbv hsge of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. d 8ko8h,ix qct /x w9t/p+x9tb 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 of 100:1. What percentage of the original energy i xd89x 9wtt,ikc/o hpbq t/x8+s 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. 4182 zcvji(qmhk . ysy+:bcpg) h s5dvHow much less power would be lost if the powvyp8scz4v:ydm h1 q)(h5 kbg+j csi 2.er 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 9 kq)(nho ,uonV 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 transmino)q,nuh ko( 9ssion 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 5z* nj o;nfqq2+.0 A. How much energy is stored in the coil's magnetic field?2oz qn jfqn*+;

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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* xfjn1gv193fjko + jv. What is thi3n ff1o9v 1kgjjxj v+*s 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 ci;aknay6)z )b3bk; haercuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed intokiwliu p6g6)5 a 120-V 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 resistd, k21 -/ k6e4fvpxk1w oh 4+kvduw0qp4cp xgwance of the lamp?e0 k/ odwvf-1 x4w4dw41 v 2g,pk6x+uqpphkkc

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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.wkg: yu(zy0 y8 ix/4og What is the peak current through4(k8ixo wyyzg:gu /y0 the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is i;zjr51ro he0the power dissipateojrh 0 i1;5erzd 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 50-W res b-thb+g :prl/uhm;nh ;kq)/iistor 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 resis7967ubnck odqtor 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 eq. y7kk pf0+,cv .t nwn-n1rpa 50-W resistor 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 reactanceefzl;o .u: k3e of a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.y9(2t qv) eowa50-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 reackt3 gby(.og//(pkt7 v*dtcc )lq s y+htance?

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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 if 5kecbuy3,c e*s /(2xuo,xy knductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a y w7y /p y1f.,mr9kfa4a4nyf tfrequency of 20 kHz is applied tot y7naff./y4 wfkyp ma91y4r, 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 d pedg9 dp ve7dm5wk r/ q7w+8yvfq+7,to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 1px tsur2.pcq. q-76ez0 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 l327ot l f:nbeis needed to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF c t qbc-(jqov7/apacitor 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 reactaj9 su6yi 9xc3j4qv p3once of a 0.010-mF capacitor be 100 W qu69sjoyc i3j9v4xp 3?

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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 Hzqrig 5)nh;rj r+n,i1 e 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 r;hbmd ;ghe/;aesistance, 15.0 W inductive rea ;mbahh;eg/d ;ctance, 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, ana ,4x- p(ddqqyd 1.0-mF capac4 qqdpd, (y-axitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil3xh w. )7lugar6y hx7k, and 1.0-mF c yl 7rx huk7g)xaw.6h3apacitor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with fvcnkg8fem5-f04j6s6g eo i( a 20-mH inductor, what is the impedance at g8 es6- c4fifvk0(je6 on5mgf 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 connect+ 3b ;m/seuzbled in series with a 20-mH inductor, what is the phase angle at le/;+ m zsb3bu1000 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 aab.ai*v h +4lc series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedanc.+l*ahb cai4v e 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 i3egjazi/9p,o 7mq 3jd s needed in series with a 100-W resistor an9 zoaj/p7dq3iejm 3g,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 )rxtto;6mum p;nf /6w series with a 450-mH inductor at 5000 Hz for a total impedance of 4ow mpft;/m ux;nt66)r0000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0kwiif. ck9; e0-MHz for a totalc ikki0f.9w;e impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is cz8aq)ip yib 8*/u(yk) g a4/dbwu 16(tbgrnzwonnected in series with a 20-mF capacitor. What is the impedance at 1000 Hz?1y(u g )gza wwi y *kun/a/88izqdrb)bb46t(p

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is nee 06fqq b tyu07ckjdbzc4,j61eded in series with a 10-mF capacitor at 1.0 kHz for a total impedaj6b4c zy0 7c,dq 6tuqkfb1e0j nce 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 at 1.0 kHnvnncr.1 3ck-z for a phase anglnr3.1vn ncck-e 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 amo j ncv+v);mw8l ;pve511 rt,gjub7dt 1.0 kHz for a total impedance of 4d t1 ;vjm c;l)7v5m, 1jv8wgnu+erbop5 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 seriezk e9i( l*ak hs/-h,ovs with a 100-mF capacitor at 120 Hz. What is the phas9sk-l*vohhe a iz, (k/e angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20ft5mquzq2g0l4 xz-e: -mH coil, and 1.0-mF capacitor are connq t0zzqf5 :-uegxl 4m2ected 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-e*62++ugl (dqkzht jamF capacitor, and a 0.kt(2*qul ++hze 6 adgj350-H inductor. The circuit 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 capacit6jo0w. )fpwn.ogh9 k ld* n,aeor of capacitive reactance 30 W, and an inductor of ip. 6ejnk wl oghfw.09)aodn ,*nductive 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 circui0 pe/t bj0hj0ht containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H indhe0 0j/thj 0bpuctor, 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 withr4u uv71(6xjmzxw s6i a 500-W resistor for a phase angle ofxx7vwzr64 u m1(jui6s $40^{\circ}$ 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 = 1m.g,9 wq yg.mqs, xqxfzn2)+t 0.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the drivinf2. xq,xg9 my)zwms, +q gqt.ng 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 ci sy)zdz/f c+n +z3uf5nrcuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W cz u+/z)5sfz n+c 3fdnyapacitive 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 a+hwatk)7gi ;bng5w f ,n AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 3ytd ./ w4u3xdu4k/i ct0 W. What is thuu/4cd t. w4iy dtk/3xe 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 circuit*p7ecrjdq)-0a1 u*f0ss v 8 xtkcsf /u containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected tou d0/8a*0 -f7f ucpsseskjvt *x) q1rc 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 1.0n wi;zvz*6bh6lxeb1 )-mF capacitor and a 15-mH coil in series? b*n6wb1i 6v)ezxhzl;

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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 capacitor for a resonan1 g*x, thltvr7t frequency ofvl,h1g7x*tt r 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor rv *hkb,2eouwox: 01z for a resonant frequency of 1000 Hzewo0x h1z*k2bvo ,u :r?

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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 wit ;cw;m+5w: ogthhm8l k3oi) wuh a 30-W resistor and a 40-mH coil if ;gwtm)u wiko; :h c5h83wo+ml the resonant frequency of the circuit is to be 1000 Hz?

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