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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://autoconfig.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://autoconfig.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 unitsfb 2g//d.xujm of magnetic 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 sta+:v7ety gghzee)8 ).pid ae1qtes that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of w8l* wbbpv)9v gire in a coil produces what kind of change on the ind w9v)bbp8l vg*uced $emf$, 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/ypr/o 3fj (cvzsi 3+1 zhjn)c produces what kind of change c fhnv3/(iz1jro/+ )jy3 zcpson 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 kinro;9k*ho atx 2d of change on the induc*;o oxrka9th 2ed $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field anziop2hw*k2y 1 h-5eis $emf$ 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 io -w(efc *r8sa conductor will b rw*c8fi- e(ose 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 horizontald x8ifi-p)6vednh ;i * table. A bar magnet is held above its center with its north pole pointing down. Th*;)e8dx6 nipvdhf ii-e stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontalls0 8(xhmj2bdwn6m +dmy 0y8 owk 3l*l table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coi hl 382b0mx+*om(jn m lydywd6l kws08l, 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 magnetic)9ik a/br5 ki+ ewqgz0wtd;5w field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil awaq09biw k tgr ;d/ki5e5w+z)s 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 levelvb2)v zr.fxvo.0 bm)s table top in a region where the magnetic field vector points stv2fbos.z.r)) xb0 vvmraight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a regionq3d(dfy t4iq.(duu9 1mp p2u6 6bgfbk where the magnetic field points straight down. The magnetic field disappears sudd6f q dp(2uu36u(.kb pdm t y94fqi1bdgenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table-ukxartt)yh /1n)c3 v and carries an ever-increasing currt-xuv)yk1a/rh)c 3t nent northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering first. gqrhndy;l11 9o; i5xih hkf2+ As the north pole enters the wire, the induced cur;k+ ; h5yoh9i1q1 x rfnl2ghdirent 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 5wl(lvf31p crp. 4bmc angular speed about an axis whose direction can b.c41wplc 5pm3fr lb( ve 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 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 angular7px3 ewjhf+ 4. ooy :la*epwr+ speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must beolro4f.w*+:h7e appy+ 3wexj the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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本习题练习题目来源于51fly国际课程 (https://51fly.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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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.bhsrvw +2/( jb
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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 anst5xo e bhu-(eb, 1vu: $emf$ 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 amkjce x .pll28,ud*g/h(8vgs 5b3 z xmagnetic 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 (oriented4t+ j4t/;izzhvp (r+u j4;vufd5en lnx w,c*m in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a stateehuu jx4zmn j (pd ;454;ctit*/ +fvwlz +rn,vment concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a )bo gydtij fvq32 93b*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 transfor)o yi7 y7wfnh:ms

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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 e-r +4kysgm+z: y(o czpach second. The frequency of th4+y( :o rzc-+zspg kmye $emf$ 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 jzxrp (c/ 9.9cti/tnlused 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 devicz08ea65ple,dfs4nj m e 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 contains more loops than the primary coi r)a) n* :nx ov/y6*dy:ndogsul then it :su)) 6*nv :o ngyddoynr*/xais 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 thanv9sxi2.u si06j qh eqvcmm rtyy77..48y ;aju the secondary coil thysqvuj4;ii2ymtqmj 7cye.r0s7 a. .8x9uv6h en 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 oyho1r3 u;o3 y612lc lh fd.smpower 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 cc7lalog6x0 ein f+.,mircuit,

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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 ideal battery of coqg x2:trv dm1+nstant terminal voltage. At the moment contact is made with the batterv xdg1r+2:tm qy, 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 of c e -zr4 86qumw;s/pzgfonstant terminal voltage. At the moment contact is s 86rqpm ;gz/wz4-ue fmade with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to anwk d h9:z;+ruy $emf$. 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 fx m3m b3x4-hsngv 8nwhc-l3,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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本习题练习题目来源于51fly国际课程 (https://51fly.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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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series k;sn-tvf oz7 4to a battery. The time constant for the circuit represents the time requ4fokzvn7-;t s ired 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 seriesa 5gq.le 8yu5 iqgfmtt8-1 2yc to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to dec5i u81f m8qcg.et2-t5 ay gqylrease 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 excepq :iufs4mh*g/ 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 supplc 4y3 w1/wwz:3zxtku sapd(:ly. 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 connex,l weanje: 1/cted to an AC power supply. In this circuit, the curren el:,a1wjnxe /t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when th4xu/ it5cigv : 16evdmob ob(f2xki.3e frequen3v5.1bukxi 4i b(mf2i xt coo :d/gve6cy is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is d6u rvvya ys:,)oubled, the inductive reactancvy v)ys, :6aure 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 voltage across an ind*j l.lx.ag ko dd)0ju:uctor approaches zero, the inductive reaod ajl0ux.k.dg j*)l :ctance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. Ifq ure+2jza,l8190 - nsskice wnti,; n this circuit, the curreiin28rls z,+ 9qca,ejw u-et1kf0;nsnt

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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 wptc/idb3iy(2 hat factor when the frequency is tripi/d(3t2i pb cyled?

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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 w1twyb0x4w/b AC voltage across a capacitor approaches zero, the capacitive reactance of that wtw/b 4w10 bxycapacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the in. 0pq cxfwps,3qfo tcxw bt9 +tq8(.p)ductor and capacitor in a RLCq( s,o8fqft.x39qcpwbp+ .ct p )0t wx series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined7r,-yza1hio 5r zz -ay as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R increases .n o6lwx7w:u- wuhzt3wfg;v) . When is this wuto:.w3g;zvx) wf lwnu-67hstatement 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 impedanceby/szqlcbz *,q)g s i5dr c1): of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit increas9lfjd,;r8h swt;3 pm qwq8rhhxq( e *1es 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 mw y*mej /lby6/r:2hj double in an LRC series circuit, the resonant frequency j: yl /eh*2mwb/y rmj6of 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 voltage. At resonance,o dch 3/t*knbc *a)ce 1ima;a8

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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 circu6ubpu:l ax 5:/oiem,omrw*.3neb9aj it 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 r7 h* ;7zmr mkbzeq87z ,acz;ogotating 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 arbzmckz;z a8ez7gr,mo;77 h *q e 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 2 jv:krju6 n9cmagnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field veu6v ncjkrj2:9ctor 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 fq+rct9m9 ox;c c:1xffield of 0.20 T. Firqf o1ft +xc xc99m;c:nd 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 l5 0c hm7mos4erv/o0bdoop 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 from5hz(t6 a- kyw5e.d,8s0 joqy0zz u jqd $4.0 \times 10^{-5} \; Wb$ 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 turki7 cv4o88d 3n w7qm mic6xu8wns of wire on a square frame with sides 18 cm. A uniform 8knv wcu7468o8i dcwm mi3xq7 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 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 withk**fvl k(jo xp bu,5y6vv b)o(pw7w9s 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 and arqo22 ob,n5ybtea $0.20 \; m^{2}$ 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 horiz6l-xd9:6gei zxfb*-s6j9:n dwlqsi x ontally at a location where the dowi 6l -x9sb *n:efdx qdx9sz:wglj- 6i6nward component of the Earth'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 tha hiex-2/ls 9ldt is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field o/l-lx92 ied shf $5.0 \times 10^{-5} \; T$. 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 lo.*tr *nrvfxvy *,g9u al53l xbops 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 consists of 100 turns of wire of a0c,. +e3trxw) qiwjynrea $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loog klqed hil*y /qa2*ceo(,.kp6a(q;mp is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop2ilqg mae ko6(l;e/ydh *apqk (.c,*q 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 consisc 9fp:er,j orlzym7u l/5 .ld)ts 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 current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output lx8saoy4 m, nnojs53 k:/5uioof 12 V maximum when/k3oo8x5sji: ,lm5ynn oua4s rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with ope ipi04,9c pa 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 resistance of 6.00 W. The morcf fswv-v0 gn99 w.xmv(8 bh+tor 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 resistancu5u g.b+silc0 e of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generc+ s.b5gu0 luiates 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 0h..mowos9gx gd 0 0zma 24-V power supply. The0sg ox.m9gh0z wm .do0 operating current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0cw e)cw 5r1:zq W is connected to a 24-V power supply. The operating curr cr)ez:5wwqc1 ent is 1.0 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 24q:ia 4r xc8d5l-V power supply. The operating current is 1.l45 r:iqdxca80 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 tocxo)l,yla-/ -m )zg 8evyum v+ 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 ou7pqn f5ae:st7fc;nk6/m n2 w + hihqu5p 5c:ef a transformer causes 14 A to flow in the secondary. How manyi+nc7 k e up2n 7f 5qhnmq/f6;sua5pht5:we:c turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turez yz;-nb2x6 rns are necessary in a 110-V primary if the 24-V sec2 xz b;erny6-zondary 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 hjo8s0 c9m khrv 5dgh:*( pyzy;m+ uf42000-turn secondary coil. If the current in the secondary is 3.0 A, what is ;h om8gy(vhdp s4k*z:9 yhmf05rj+cuthe current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of ahbd-y a/ex58u transformer. Assuming 100% efficiency,aey8x5/ dubh - how many amps at 24 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 10..vjpke hz8 yt- f-up*-0 mA. The primary coil operates on 1-e 8. - h*pkuvytpz-jf20 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 turn ,-)+nvp fk wjna;uu mb9rl,2ys on its secondary coil. If w2k -uruj, n; y)n, +9pmlfbav120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primar .umn3z r4,jxey coil and 300 turns on its secondary coil. If 120 V at 2.0 A is app.xm 3neu,4j zrlied 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 secondary has 200 tus9-hvtw8 (exn 6-zhkvw 6f2rz rns. If the input current at the primary is 100 A, s-6hk9z6tew h xn-vrfv2(z w8 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 seconda;e /+,dn0j oyd6zxhl xry has 200 turns. If the input voltage to the primary hxydoe jx6l ;/+ nz,0dis 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 pq,0ynnh5amh4( p /ut100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the pq,(nuy/m 4 np5ahtp0hower 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 y s 2t-je6krljpu7+ j6120 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 turns in the secondary if the primaryu-ryp j6j 6t7se+jkl2 has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepped u xi;ad9 b*3*rgh +vzigp to 4500 V by a transformer and transmitted through a power l*x zgivig b9+dh;* ar3ine of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stg t-+x9 y ;*lqvgq.ozfsl +ht*epped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the perc-qt *q;sto l+hlyz+9.xvfg *gentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance v3 3r;r)(cav 5su wj8m0;mwkxhnvpj;of 0.60 W. A generator produces 100 V at 70 A. Irwh ; 0a5(v3m3v;;pxsnc ujmjk8rwv )n order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A generau6 c4pk ;uh:cdfu0bc.tor 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 ene u 4:ud0ccc.k;6fbhpurgy 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 would beo/ffxa.ah0i*uk b*+e lofe x/u.ih* ao*0f+kbast if the power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be tranp+k ewz76,z* mu+opbysmitted 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 transmmk yz uz+7e,ppo*b+w6ission 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 the cot(c1pzma .u ,lhnb(el*c d)0uil's magnetic anu(1 (ht*,0zu ) cllcdpebm .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.p*.6gu9dqtdo2 dr:x w What is this circuit's time cons g q92 upx:r*od6wd.tdtant?

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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 tht13(wjn up ,c e31qwqyty5lb,e rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak curreh(.bu+f8q :( za2 a p*:f3m rruyotkcznt?

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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 outlcm. 3t* rmbli)et. What is the resistance of the lar tl.cm*3)i mbmp?

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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 po*;rsl j44h wcc5eh rv2wer supply. What is the peak current v4h elr;5*cc2j rh4s wthrough 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.-d 5y.6wt mjhn9 zo)hl What is the power dissipated in the resistor? 5wyz -hj9dtn.6l mh)o

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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 resisty:h3u eyskg 6+or 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 acwa7zu + 6m,1 )dzswus 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resi 9uv q3l8faejputrxtnei0y+ - 4/-y j8stor 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 1k*k 6))l:e2 xrrybv j6 dkt,fu.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 2.50-0srayi*hht b-2) ex0 kfx c*l.s;ed:g,jtnk ,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 va-b*mhbb.m(1rd 2sn 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 yy7kc15dl/ocni /af .of 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 V3y5rnuw f*/8o87nvmeqwd ea). - wwgk AC at a frequency of 20 kHz is applied w8 ra .dwweq e)mu5of8 7/n*3k-gnvywto 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 tfj ap9x72wan r3gk3 e:o 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 capnlr oq9ym6q ;do1*frm6xm+- j acitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance2ya6fp p y7o..dp,p9.pj a nkg 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 aw3xm69mdi eu0 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 0.0+4j ,xzz b:m8letknuna2th*;c u d1-p10-mF capacitor be 100 Wp1ju4a h,bnckdtmxt+nu:-;8*zl2 ze?

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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 atp sl; ofik0e4av-(0c g 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 seriesam 5v jlioe u-k7*v619jpk 9in circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitiv vjj1-5mu9ivkkao pi7*9l6 ene 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 1500nwvrr9 d6wk /: Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in skw dnr6 :/9wrveries?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and. yxg;y;sr ,9n7lgi dx 1.0-mF capacitor are connected in seriesyl;yx g;7 sd.n,9rix g?

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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 wr9lbcz k;d87z)q sf/is connected in series with a 20-mH inductor, what is the impedance at 1lbzsz/qf )7 ;dkwc98r 000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in setgoztby n:*6osjp8/6 rj07 2 swg1w tbries with a 20-mH inductor, what is the phase angle a8 w*2 1szts :b6ogypb0trn6/ jwo7jtgt 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 gv1,i2h jp 2qly 1)noba series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 1go y2 )j12lvpb,1hqn i00 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resistor9vgvc 3e:+avwe ,v 4f5ytk3z6ym sg;l and 15-mH coil to get a total impedance of+v 9gczs6f,4 a:evt;3 yegwvkmv l 5y3 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)f 13xm,v cuys at 5000 Hz for a total impedance of 40)1 vmsu,f3cyx 000 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 y 77qan7 -vfr3o+q,qenjkw,d resistor at 1.0-MHz for a total imp,dj77w 7koy3,v qqf+eqra -nnedance 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 the3 ax- duo+hvnx *7dhci*j0 gr7 impedance at 1000 Hgnuhh*7*dvc7ira-+ o j30x x dz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor y f5i2 7bf wtx,v/j7npat 1.0 kHz for a total impedance of 45 W i5f7f/wx2p7tjyb n v,?

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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-mFhm(n.1+v1ijxlose, vtl1 ho* capacitor at 1.0 kHz for a phase angle ov,h lmln+so.hx1e1tj v1( i*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 og omp/51 j apl808r(:zsfymp35msbhwith a 30-W resistor at 1.0 kHz for a total imp:5b(slo0/hm 5ampm8 ygpop 8fjrzs13edance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with +cw 8fuazdd ;/zmrje)4 d5wk,a 100-mF capacitor at 120 Hz. What is the phas/4uz z,k jwca r8;dde)f5mw d+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, 2y 6mb u6gt*9hb/r(uj n0-mH coil, and 1.0-mF capacitor are h6m n6ju tybug*9rb(/ connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, and a 0. tt25 sd9nxr9y350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current r2ynstx5d9t 9in 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 bi91nug1sp h9kc j8 z hogq+1)of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series t) z98b9+h j q1npu1csgoi1kgho 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 containing a 50-gwxtm-zlm; n6 1vvw2 (W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connec1w- ;v mx tgv2wlm(z6nted 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 with a rh jw ko3zq 0i(35k v1j2ql;hj500-W resistor for a phase angle of (1i jhh;3z0rljk qqk2ow5 3jv $40^{\circ}$ 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 mFbtoct; 9+bn v8fgedi yr +o:zh /c14k-. At what frequency 4ih z-:r1d ocfb 8ceo/+9kv;ygb n+tt should the circuit be driven in order to have 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 with 12.0 W resistance9pxdt7x l0av 6:9 dzmd, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 12x pl 6 at790mzdvx9d:d0-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 A czek(hicu+tikah* jege0qi*;p2( r+l ; 0-bgC 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 resistancecyqu)2*wbs; fe/x8klp yt20 e of 30 W. What is thyf;2/)w qsl*pu8 eb2 tceyk0xe 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+0(l bjc)o 2(rtrh 0 doksyck4t containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected ckcohj(b)4 ys k 00r+o2t( lrdto 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 capacitor l t);*2repeo tand a 15-mH coil in series?pl2 ot t);re*e

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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 reson2 gb(l,soni z4ant frequencigb ,nzo(2l4sy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonaey y59r :ys4ctnt frequency of 1000 Hst yy9:r5ec y4z?

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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 anmu et.i4lk ue0 :t;oe3d a 40-mH coil if the resonant frequencytke u;o0i.: eu4le3t m of the circuit is to be 1000 Hz?

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