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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 flux e6im 0rgvc6g:;xx0u a uxcept

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that th. , si2wukk7ace $emf$ 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 i )**hb-xuqep/ eodgv8 sjo2)of change on the induch-pe2j**8q d o soiv)gxu)e/bed $emf$, 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 magnetpebr j1)9qdz+ic field through a loop of wire produces what kind of change on the induc9 bpjqde )z+1red $emf$, 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 producekacmh++5+2zq k-i orgs what kind of change on the inducmkgoc 5+qr+h2+akzi - ed $emf$, 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 fieldi7zp b/s. 96yr4 i fwck0rq4uw 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(j9 ahd/hf +fvefv;2i induced current in a conductor will be that whi; +jha f(vhd fi/e2f9vch 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 hori ydhee2b tfn)-zvw23 /do l52nzontal table. A bar magnet is held above its cen/zb 2oe 2d3)fdw- vynn2tlh5eter with its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held a9opi +q), b o+vjv*pnubove its center with its north pole pointing down, and released. As it approaches the coil, the falling magn+,unpb voq*i9) j+opv 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 the ms yll/-u(xrvo 4x h5-hagnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense ou/rvx x4lolh y -(-s5hf the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magneti37nv*8ukt qy v mauu 4f (71jn:5ftharc field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as th: vh87n1tujvt *7qyu fa5nf(3mu ak 4re field increases?

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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xxxxxxxxxx，获取更多资料
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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 3 s kyvllzd 5*rl bm,q-25yzc*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 this coil as t5dmb-yzz ,sckv5r2q l3*l yl*he 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 and carries an ever-increasing c*xa 2;h8z7hzj sifi9c urrent n8jh2i *cz;zhx i7fs 9aorthward. 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 9/-bdx( jcrj sk xubmzad4 :n;/u2w:xfirst. As the north pole enters the wir/jd4abd-n9s xw2; :( bmjkx ur/:zxcue, 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 spexds i40i ok8k7qcf4oc, vj+; xed about an axis whose diredqi 4ks80;coxf 74cxi, +vkojction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if 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 snx /vnha/df1: peed about an axis whose direction can be varied. In a region where a uniform magnetic field points straignvnd1:/xaf h/ ht 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.6h )lkbn,qa h(
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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 w(or l l.o-47mlzvvqk;l/:*xr*yf raan $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. Th(:8 bfeeq0p zge $emf$ 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- (nfl*ev ahw)(west direction) is moved northward at constant velocity through a mag nfa) w(vel(*hnetic field that points straight down. Make a statement 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.e ;k *+qjhxw olm91vosp+gf / 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 l)r ;,e/ zjoqdtransforms

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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 sfketqf 1l:7(e769bx kqsmi c) (ae oa,econd. The frequency of thf7q,kx:t(el1faqbas69 i eek( c7 om) e $emf$ 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 u1(o5bu4ym39,ahjmc s9zx yivsed 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 device thaew(,kna)dai. 9ft k3 ot

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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 seconi : z.-am:hxps2 nx1ay9xj j1odary coil contains more loops than the primary coij:1jy npzaix92ma. xox1s:h - l then 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 pri3r5 h3a 1hglcg3v7fq2z tr8jpmary coil contains more loops than the secondary coip chaf21z78ql3vjrg3t3g5hr l then 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 power inpu37z uue at(j)bd(w5sq*7 n doct

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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 ci3rq)(93 kg+gc pt+nuv dljj1z rcuit,

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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 9vq0sux9c-qw+/9e9ahc:qng j g cpe. :rp /e fconnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resis9:g-99cq.u/cf/e +v hqp nrp awj:9 0se gxecqtor 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 : e c7qzhs.:j2 lo;ms0oqxr(oxj.ih: ideal battery of constant terminal voltage. At the moment contact is made withh:j2z. l o:os7(;m.:exqc 0h sqx iojr 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 tof,drbwkdm2 r;c* -w *b 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 ayzcb1xx 7 vh0 ;v-h ses2g;tx*nd 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 inddd u2;s 0/o;(lrupqwluctor are connected in series to a battery. The time constant for the circuit represents the time requwu;s (2;d udqo0lr/pl 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 arewd x 8bgkgc(w-sw;:, e connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for t8wsg(;-bxw :ewkdgc,he 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 ;30 sss-;tr xis t/xxmc(as4 ehave the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. Omwr h :(zq-9p8:hc qmen 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 conne/)a kw qf2 zym-ti-siwo*5q)ected to an AC power supply. In this circuit, the curren)2*o ey--s ziw5k/qtqwa) ifmt

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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 frequen)5qo johw54cjs,dyrr3bl r m :,,eliezu a6 69cy is triple5 reo oj r6sjlaclmud,) q3ryw:4,65 h 9,bzeid?

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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 thu5q-cw2bh y c+e AC voltage across an inductor is doubled, the inductive reactance of that inductbqcc uhwy-5 +2or

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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, the uob t h,98-7gekvz-yup v)4vvqu7h6ginductive re6vhvuzq u-uo9e8 tk p7 4-gbhy,)g vv7actance 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. In this cibyob)p42 3 +smnzr ysyyk,w+6rcuit, the curre4pk, rbzyyoyw m 6)ss+3+ynb2nt

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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 fv0-3q)bziy y 7 t.ziriactor when the frequency is trip3v)0 .yqizryt-bi zi7led?

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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 th ,vt;a27amo a0nkt1 pee AC voltage across a capacitor approaches zero, the capacitive reactance ofev,tmnt; a 0ak po271a that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle crnb7gnov)(w l2nlus)280 ou between the voltages of the inductor and capacitor in a RLC series circuit( w 7cb)o8g 2lrsvn2)u0lnuno?

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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 defined0 *cnlhask3mm8(vz b. 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 if1iujd7df iyj0 t(z)k( R increases. When is this stateme1z i) k(t (f07yjdiujdnt 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 djvkb b iy9u)z 1g-t6gy2tp*9circuit 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 seri tldx( s81eb15k1 y4nrdm/fa ces circuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both dof-o8y f l29yxquble in an LRC series circuit, the resona lox qy29y-8ffnt 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 ti)x s2v/rz:k(*7ee mb4yfd rnhat is 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 nq 8+lrhue0 5 rkrx82vwhen

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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 .iff(t4 r40 g rmcj 15qms. rtxbucbf7*,dlb;0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the m;lj*qru1xf4t c(gd tmc7f45rfmi . bb .,0 rbsagnetic 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 rad4zuwmo tk c2 4sa,z*eo3hx :2dius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the m two:ao4kcsu4xze 22,h *z3d 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 radiuqvwy ()y m p5f9vg-y/cs/c-h ug+k,mjs 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the pla c (m)h/ yky-q- /j+c,9vfsymg p5ugvwne 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 ode5 (iwb c 0,s1sjpgq*riu86 xf an adjustable 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 cotvnf:ra 1be::yy2)ihanges 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 a0aeiq( qiyn 20 square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniform(a2qny0eqii 0 ly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area qv;j*:r1d nro 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 are .onxv/8os6a va $0.20 \; m^{2}$ 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 frgr jp5 .x0r/zlies horizontally at a location where the downward component of the Earth's magnetic fieldg r prz5xr/j0. 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-1-sl s/2snss7uedfp; pf9 scong rotates at a constant angular velocity of 2.0 rad/s about a vertical axis nesl c;/ ssfpf-u9d 7-ss 2p1sthrough one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectioubz 4x2, ;vzv rtqph/sr//bis*01khznal 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 e6ojdgt uu*9 /gdnq96 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 loomhma+* yp /h*g5:augd ps on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage og/a*mhugd5 ympa +*h:f 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 turns of wire of x-wc buc-e/ b/vl6e-j 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 A9-q+gek1x o(k5ee hvfC generator with an output of 12 V maximum when rotated at 60 Hz. A magnet xhkqev91g ke5o(e f+-ic 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 witm7bh1.b xa,7 rti8m hwh a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. Th,fy) 3 ssrqp 33gg33gcwv)z4aurjr 2le motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. T6cbwc ti.zf*k7lk6 * vhe motor operates on 120 V AC, and when running at full speed it .7vkzk66 fiwb*tc*c l generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 2da t 3/i3pmw 13rk9pzb4-V power supply. The operating current is 1.0 A. What is the start- azt3pkbmdr1w9i/ 33pup current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supp,adeqhw0i v-tx6n 9a +md7dp7ft ,yf,ly. The operating current is 1.0d dq,f9-6np0,aivx7m t,hey7 d f a+wt 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 ir9pgdg n-n6i im /3,rss connected to a 24-V power supply. The operating current is 1.0 A at full s369, i/ idnggs-npmrrpeed. 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 to r wmm0m2vl eiqob66)s *educe 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 1pb)1:g17kdu5/zoewm 6s l n 0 nmbrap-4 A to flow in the secondary. How many turns wmzpl u/n)5-671 d 0krmb 1pag:sobne are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary i5 33b( vxl oyhjh(ulm7n a 110-V primary if the 24-V secj l(um 5(v xblhoy3h73ondary 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 aa- *;l5kj qocq.l,/6l t y( xko/knngd 2000-turn secondary coiol6 ocxnl-l, /qg/ .kt(qak;yd5*k njl. If the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the p6ggw7rmu6 s e* maago)v;*p. primary of a transformer. Assuming 100% efficiency, how many a.;6g)m u*gea rs p7opvm6*agwmps 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 n2pbx wv4ce1 3j3wya( a neon sign transformer provides 7500 V at 10.0 mA. The pn4yw(x1 c pb3e 2w3vajrimary 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 transformer7t) *nkixh ee8 has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to t8)nxe 7ek *ithhe 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 transformeraj*1d 9ngl3h)tyl2v oki:d5u has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is appldnjk*i l9ga o :5h13ly2v u)dtied 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 transforme7 r nl+s8kzia0r has 100 turns and its secondary has 200 turns. If the input current at the primary si8l 0r +nkaz7is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turnsbgwuxzv0m vb/ v4.;5z. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondarybw.b0 g4v vvz/m;zxu5 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 hayu +8v+jrng(b s 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can exur+v b+ynj8g (pect 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 rc uq;r hu z4,2sws*bqts1 z((of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of u2; (( sst q4ur,1rqhwc*zbsztotal 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 5+m muzf p,1x8apez(h 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 resistanzmh15p+ um a8,e( zpxfce 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 or 2 ej)unq(gg2:ig7 wx072(glmd wi,tgwjz 8r f current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of totalwugmnd7:27l xi(wj08grgge 2 g,q(z2 writ)j resistance 1.0 W. Find the percentage 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 longj+9y3f4w cdpr 4e08 .tcw x4kbwmjei+ has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the trawywtkpx0+e4r 4b8wfjmd 9.4j +cce3insmission 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 t-+-0 m:sqybo v2sjhd e08txjufun-r8nv st-2otal resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer wisf0+yents s:nudvh2x v -0 o8b8- mjt--jur2qth a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down /mfkiq:l pkqy*3/0men1v 2r m cd5)w ja 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 1000 V lk cfqpy1ekq m*:0 ) 53rv/di2wmjn/m?

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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. Itr,ww ,686x. yix4 i huyubif/r 9jcpv1 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 los h,ui 8ur4 f 6rj9.y,w/vybiwxci1px6s in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy(lu ;6xi1muie; jeh6x is stored in the coil's (j u16 eiux6lhim;; xemagnetic 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 resi/+nz r3qgw,ma stor and an 18-H inductor. What is this circuit's time conq/ zg,rnw3a+mstant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 12032q/l mxr xvh0 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. Wha ,ah eh8; moyfjm;0z1ils(o-y t 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. gpq*3pm s0jn4 What is the resistance of the lamqp4 pg0nm3 *jsp?

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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. What is the peak curre.x cm,dg ,s9nbnt through the r c. 9xgmnd,s,besistor?

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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.n j)vp.b0 :zm40yr xth What is the power dissipated nzr0bx) t:h 0pv4 .yjmin 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 5eh ,m )d7ni .wgn43wrv0-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 is735hq7th c /pl e py pvdcx7d*3a*,vpk $I = 0.80 \sin (240 t)$. 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 is )f lxjt1mn26k$I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 60opzr(rs, h6q+tjzxqjf t)6(( 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+ywdzrcu 6f pu(7 6f0c a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W o1: bi3vk ws6(y.76rb zi8jbmhbvb 2iuf 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 inducxmgn byq:ey5 u00b- +mtive 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 w mp8us6rbn/0 when 120 V AC at a frequency of 20 kHz ismu6rnb pw8s0 / applied 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 au .npyg e l3r0 *oaixy1f9x-,q 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance odi7c9(i -5hvkg 8qf nwxn,fg;nu-h; of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of 08 3g4pi)ua2j idfbggq( . y6h mv-dlycapacitive 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 :nz(u27t. u+ l hr+mqzgs/af va 10-mF capacitor 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 reactanceyv)9xv;e72 .-vbi z zh qf3y;xwrq n-p of a 0.010-mF capacitor be 100 Wwv;rf pb93x-y x7.z2 q-hzeviq ;vyn)?

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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 H x;v o/;vfb h:)q+csjl4duc4n1e obx (z 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 resisxz5b8iws qgsg yz+g. vq8;)7-w 9 : kgxnsenw*tance, 15.0 W inductive reactance, and 10.0 W capacitive reactgws: e*qbx . g5g87wsnzs9kyw)8;nvg +-xiqz ance?

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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 cov2oqp*xtc*w ,pp9+ xsil, and 1.0-mF capacitor are connected in ,9 c pqpsp2 xt*w+oxv*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 re9g5o )z je s4w3 sj15icmlfp3msistor, 20-mH coil, and 1.0-mF capacitor are connected in seriecs5 gfioj ez j1wpm43l sm)593s?

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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 3urntrwc s 10f0fv1ie : 3sz2m20-mH inductor, what is the impedance cr1:3sf 20zvfwt01sunr mie3 at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is co8sove24w mh44n au+ipnnected in series with a 20-mH inductor, what is the phase 4 ns8+u4vimpw2o4aeh angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circun., v0psdi he)it with a 20-mH coil and 1.0-mF capacit,h .p0d)nve sior for a total impedance 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 capj89 7+j( 6qrzl2moai t,su1gpstn s3bacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 11r(t12, 8nosbsit7alj+zs 6gmp9 ju3 q0 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 45 unq dzyoq3)--0-mH inductor at 5000 Hz for a totn3 zqq)-ou y-dal impedance of 40000 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 r w (( 866ptc.psv ,(zk00ml sxsk2blcdzdu8dput in series with a 100-kW resistor at 1.0-MHz for a total impedance of 150zwkpdb.8(6(mx, k 0(8d uzl vls0d2t6pscr sc 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;2.i w,ugdr),wjp v yui*za(v with a 20-mF capacitor. What is the impedance at 100pa,, r w)u u jiv(ivgw2z;d*.y0 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor snz e1(,n5p3r )w +qneecykq -at 1.0 kHz for a totalz - 1)(e,wnqserycen3n +5kpq impedance 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 z m0;ylb/5hkr56 f.a6hv dqa5w 8nqzl capacitor at 1.0 kHz for a phase angle of rh lzzk/nva.6; f8qb55qdm5 y w 6alh0$40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz fo/w7wejj:ps:e o,s; 2cy uaxi 4r a total impew 4 e,:ia j;7ps ocues:w2y/xjdance 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 a 12 vd4qj5.p h n2hkxab900-mF capacitor at 120 Hz. What is the phase a 2h4a dxn9pvjbkq 52h.ngle?

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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 , kut8wnky ;bznz:w;. 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connect.: ;8;zkwn ,zbyw utkned 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 cap-gmh4(ngy97b k -d6vbz ;scdlm.0lyiacitor, and a 0.350-H inddzm k-v.- 7469hilsyncgy (g;0lbmbd uctor. 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 capacitor of capacitive reactance 30 W, z*nru jj7-5+x4yuhkjand an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flzu x+rk4j7 jj- n*yu5hows 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-W resisa:jhsp00 n g2ktor, a 10-mF capacitor, and a 0jp0k0angh2 :s.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 with *o(vo5wco4-,qnj l o*kyt-h8o m lt;oa 500-W resistor for a phase angle ofh*ocmt(-oy owj,48on- k5o; vl*l otq $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what fk q48s7mlgc7o requency should the circuit be driven in order to have maximum power transferred from c 7qm7go ls84kthe 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 wit epmn-jay1a+m ;x)ep8v9b:m t h 12.0 W resistance, 15.0 W indu;bmvpmj+e-8)t p e9a:n xya1 mctive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC ciccd 4yvb/yx:/5oubpic3d m1+rcuit 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 resista/fr7ng fu8fuj4m ;d/cnce of 30 W. What is the power factoru8 nfg;du//r4fjmcf7 ?

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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 containing a -)5c.3qsxlukmcx +rp 50-W resistor, a 10-mF capacr3mk.x 5 x -cqu+psc)litor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor :t b-:ifwuwu4b6)npm and a 15-mH coil in series?biu )twp6mnf buw- 4::

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needexz++y oz 2wz)i*ty qss).c 7w8pzvf;b d in series with a 4.7-mF capacitor for a resonant frequency ofc p7y.sy+zqw28;zsozvwz) b t x *fi)+ 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 3e;+ +fyksdn4p.7-mH inductor for a resonant frequency of 1000+; yd e+kp4fns Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in seriq*zra3ha v4z( es with a 30-W resistor and a 40-mH coil if the resonan*(rz3azq vh4at frequency of the circuit is to be 1000 Hz?

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