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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 ar.ykr7i6 np9zge units 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 states that y ds1b.c3j 4 cu-tztyoy:n1j 6the $emf$ 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 ;0xu -tn)gregof loops of wire in a coil produces what kind of change on the indg0) g-rnxeu ;tuced $emf$, 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 (bkn9o1nyr7 bproduces what kind of change on the induced(nk1 bnyr9b 7o $emf$, 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 d(ux.w7sfl7n e2uolx raiep /qzx/*8 1 jn,d:of wire produces what kind of change on the inducw: xr niupux 2l7/zs .(f qe/n1jdaeldx7o*8,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 field an 4:3vcks6 xlvs. zrrjv)b2ddc cr(8r, $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conductor wwo n t1gk6,9c3jda a7 ,)xr-hfuucpn7ill be thufh uj6 n7x -ackt73cdpa)o ,n r,g1w9at which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magne9w (l*ub rk2bvt8w nr8t is held above its center with its north pole pointing down. 9t8( rbbk8 nwr*ul v2w 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 magtb .fgkjb3b7 /net is held above its center with its north pole pointing down, and released. As it approaches the coil, t7g .kb/btj f3bhe falling magnet induces (when viewed from above)

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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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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 rlhbu *sowep cu y,. 7e**(s5pjegion where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, *lu .(7es*sphpw *bje,yuc o5what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table topp;(,o ksv nc8y in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in t,pvs(; ykc o8nhis 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 rekau 1fdd ayv9/y-+e2agion where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the indvyu 2aae d-+y1ak d9/fuced 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 and carries an everu0lpt; l o,6vd-increasing current norvlo,p0t u;d 6lthward. 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 gxv.za6yh* lumn5u bn:zpj;7-eh)(kof wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed from 7 n-uvlenbxzzg(yhm5a6pujh.*)k; : 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 bp /j(2ajc7/g zmh*ghis rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis /j27chg *gzjp m/ab h(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 ang zhpttv*-(,ho-9qcv ydken+;ular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the int( hop-;+kh9- ,*zqyc d vnevtduced $emf$ 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.cexy+3 j2h o(k
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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 tho5h z ch *;z7+)xdoqasn03 ycoat 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 mag1 k2 vipni58+ su98kjtukhtv4netic 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 movedj -hil xpk/+4k northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential inducedj- xkphli+4/k 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 barq f8c- ((bbmmj rotates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transformsrn ,29b e zdu q0c7i/as4i8hji xz27xr

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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 6bgc.n68+x g om,yk3v d0 revolutions each second. The frequency of then dco3g6g+vx8y. m k,b $emf$ 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 used7 hc2se 5ny afoan zzv9t58v3- 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 t-6yi c(8tltehqoz/*h ;r) hhvhat

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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 jsla1 )3+eopw/m zoo3 contains more loops than the primary coie1w o )oz33o/j+lampsl 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 primara f0 v*e;(nhf 5r;lyrjy coil contains more loops than the secondary coil e; rvf*yn ;jh lr0fa(5then 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 poweensnx bl)avd,u 3xzc0jy0: (2r 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 circud wrd7tv2(5k2 n uqdh*rucq:37kk+ seit,

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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 ideagb/xymg 3xql 045 .vsyl battery of constant terminxl5g mvg/ xyy0b.3q4sal voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal bath2g (kyil:9 mctery of constant terminal voltage. At the moment contact is made with the battery, the voltage acro hl:gcmi9ky2( ss 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 induct6q lo wxru9b o:qok+ icga6:z/+vr4e0zq-g 5eance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L andv1r +;ia)6a*um-vtdgk 9 k/ld(deh ss 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*uh2+ qiiq gcht8:wx06 dt4 yt connected in series to a battery. The time constant for the circuit represents h ti thxy t+w:cg682qq0iu4* dthe time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battew2vzjrrdn4275g: 2ud2 me4wj wu,qdh ry. The battery is sujvdmdn uu22w 4 7w hqr42rd2:wj, 5ezgddenly removed 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,x44/ q;pvm4coa aynmpy:d8c have 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. On yvl p)888dbi.d a1b qolobu k.s b)o28this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power su ;aety;1dgo8dpply. In this circuit, the curren1y ;aotgd;8det

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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 c/q6sslqd fazj8d 5h:v q8jl 8;ircuit changes by what factor when the frequency is triple:lq 8hqd8ds56ls;a8 q zvj/fjd?

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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 doubled,q r(+xwyl5s56) sb ian1 a:ejb the inductive rnai6j b:sx(rw15l+s 5 baeq)y eactance 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 inductor approaches zer, ; (i yo-4degpzko .inpjt( :8r(gppqo, the inductive reactance of thag ji pnrg p(;id(yzteo-4,p po:8qk( .t 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 circuit, the/+mp z ury6hp1,xeni* curre*/ up1hp6ye ,nrimz+ xnt

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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 factov dadp:cuf67 3y8mqf6gg0vs *r when the frequency is t8 6uv3d:f mf6gdvpy7qg acs0*ripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor apggssz8)x -u4w8 eu)wxq7hs*w proaches zero, the capacitive)hw4*euxz ssu gq)8w7-8sxgw reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltagovl 3:ccygf9n(1 0xl ues of the inductor and capacitor in a gny(u09lx :lco 1 3fcvRLC 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 d(fl 1fmf94h yz2bcj157 l qsucircuit 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 impedta jad/5 .cxp mr10y+y;z6 rvrance of the circuit increases if R increases. When isa;z5+m1yvtp.yrcdj /axr 6 0r 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 n* i;nv(ge r*)bg,oh6p4imh t. The impedance 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 yj.1eh;qxi7 ytvv(p4of 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 LRC dnw ult:xa5-4series circuit, the reso dt4uxw5: nla-nant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied vorxnlw3+ *nr t1ltage. 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 when ;:3e jx r 81yiyuzqie/tnc0k4

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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 rad cjylt+;h(s8-- zdi e3xn8ji1dh p 0fgius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are pzcpeh0 j1tn i(l d8j ;idgs8- -3yx+fharallel.

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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 magne 4am,v p3b-pzztic field of 0.20 T. Find the magnetic flux through the loop when the planez ,3p bvaz4p-m of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform ma pfnh8buc-:3d,(-77sns+qoa xs c qkpgnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector ar,ns8cxb3 - 7d 7kcqhsfqanp o+-u(ps:e 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 /.w8sdqbq,w zs 0q e fo(aly4.area of 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 coxgb v:0wdsk2 55 wdsd8il changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 12i-j)fru;22:;rjjh hyf hh x z8 cm. A uniform magnetic field is aij2-h;)hh r j2yrhuff;:2 jzxpplied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 1i2bvide4 f btronrqx9g 3*:s7r u(m;z87c3eq5 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 art9xe6vp.(lw yc+c ,r eea $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at po6(n.l.xt. 5kw bt xha location where the downward component of the Earth's m t. pn(xt lkx6w..boh5agnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is x wenyk 7r)c0;yc zp.k 4hicf35 ,,mnz2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one )3phe xfr70i,kmk.ynnzc4y5 c ,z;wc 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 lzxzu .,3i fsw3oops 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 ar-*1o4 rn-mxv7 f6 -kkoscrkjya;2 dwz ea $0.090 \; m^{2}$ 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 a8ag te tyyol5qh35 q 7a,5i1qrrmature. 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 wyqt a qgiq rl58 ,ao31h7ey5t5ill 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 turns ofe v9z 98deol3p*/ cqz9fke+aj 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 ACbx4u 4to vyvu 4(dv*7o generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is avai4xov dtuyuv7bv4o4*( lable. 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 tuoqz:cu):l7+mboaz dqo++n f 8-(z a generator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motohhfg 1imdf7 h d-3osyu3yq1l/b(s m8. r have a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. Tuv47f ,t;j y ,tk e4bdu.zn2qt:kn2qshe motor operates on 120 ,2qj,:2 4uk4vn ytt;.nkzdfeqtb7 u s V AC, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistp7a v ,c) -2/buyil. ojck;t6p ooy*xzance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up current?* )bopi.k2/vcp j6y,uzx-c o7oa yl;t

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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 supply5 wbz8)1qtuzt2qo )w,-ej y om. The operating current is 1.0 A at full 5 1 yq2)qwjoetu-wz m) z8tbo,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 tor-hzr m.1. oqsc5i )to a 24-V power supply. Thect h.-m1s rzori5 o.)q operating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a prima zm)nnkglwyhed (e2svf lh.: +9w84. ury 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 cause14xu2/ b bou;otha pr5s 14 A to flow in the secondary. How many turns are in t/5utx4o hr a1pobbu2;he 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 mjz*i5*f1h 6ib+zyrk0 gwi k q6any turns are necessary in a 110-V primary if the 24-V secondary has 100 i6q+*whg*z 1yb0 5kz r6 iijfkturns?

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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 primao q8rl-vy7 fn;algj1x76c* ywry coil and a 2000-turn secondary coil. If the current7wvx r;1n8y cg-jl7yfaq6* lo 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 (-g63fap m yehq 7 l+cp:.cbj-/i gyyrthe primary of a transformer. Assuming 100% efficiency, how maia hpr-m ypyefj3 : qy7lg(. c-cgb6+/ny 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 10.0 mA. Tbdeyaf3 gqss (*(2 n:she primary coil sgsy(3:asqf ed2* b n(operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 wi :p)1yj umv o4hhbf1:ih 7t+turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the seco)oi+ 4:bj1v ym wfh1iu:7 phhtndary?

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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 and 300 turns on itsluevr/9io3 u0wlj 9lc 8(.axw secondary coil. If 120 V at 2.0 A is applied to the primary, what current is presenurliwu vj9c8 l (aex.wl /09o3t 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 stt o*r *,tls*3p9x7pc6ejhwj z9b b,eecondary has 200 turns. If the input current at the primary is 100 A, we canrlpo jb9th3,p,**t tw*e b9e x7sz6j c 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 second q0/kmw5 r*yynw(dmb0 ary has 200 turns. If the inpuyyd0(/qnmkwb5w0 rm *t 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 tu95xqw pz5-q x.v4ftfrd+h 8 vqrns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frh5. qrq t9fvw8+v5 qdp4z- fxxictional 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 60ho ig2emh:mmd2p4 e-5up)hx+ 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 resm p4h ex)md pigm-o2hh52ue:+ istance 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 pvh6,t wm9okbbdh+ 8/. 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 tr9p, 8hbb ht6v/ o+mkwdansmission 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 u7hqejtgw,3qi: *matl tax1 nndi/w r74 8 a*/lsually 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 the3lwq ,h iiwaxmnt rad7:ta/q8*7jg4*t ln1/e 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:ep(.ct o. z -h)jasnu 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,)zna(..ectp h o j:us- 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 9k-lsuo 8cz0 nlong 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 transmission line, the voltage is stepped up with a transformer with a turns ratio 8nzcsku- 90l oof 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 d s /jo1k**7c0neeojba j(1vskown a 6-W line at 1000 V. How much less power would be lost if the power were transm vk0kn1jsja/ ecj7b 1o*so *(eitted 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 transmitted onfsup:+nu27 aq .ue/qq a line with resis2qsquapq:fu+ n eu7./ tance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in rqvc;g*s2xza4cmit gdl*0 ;4 the coil's magn* 4casq4 xdg *i;trg2mcz;l v0etic 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 resize;g(vuk5 0jya: -h*afy 5 wiz5/riv nstor and an 18-H inductor. What is this circuit's time ckr55ze zian -: ;0 u i(h/gvvyfajy*w5onstant?

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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 rtf (xfk1um , ugc-wq qh,xxq(b2q 09q;ms 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 -* o yrihz7i0qoutlet. 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 bq )6.;l 66gvhahx: u0d x3sl uil5jasAC outlet. What is the resistance of the lal. q6v:6sj605hli agxs)ba uu l3x;hdmp?

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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 th it40qwt4qpx7q+85gu:tn/ upfz 6 ,ttyi4njze peak current through the resist4n gp zj4zti+xt:ptf tu/n,7q 8yutq q45wi 06or?

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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. 0u-nsx3 :3ztb opv ic:fl6n. p What is the power dissipated s3:. v3zbncpp: 0oxl- nu 6itfin 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 resisto kmr/r ((v9dier 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 8vav *gq*gszju0 ob9 rx 2y*g3a 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 50xflg+,a*g-; zmce r :a-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 reactance of a 1. v t6a3xxeav:7a0r,t7z eb /tt0-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-m7s* dhndvsg -omv ,+0xH 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 reactanuk(b )b* rjm;r: z(ibo e5-mzbce?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 10002ch;-dbv4h ag 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(z w 5vfz2(hfv23fk5 vd p8seh inductor when 120 V AC at a frequency of 20 kHz is appliedp(vswe(v2 khf2vfz85d35 fh z 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 throukfo.7d+cj s,rknt/d 6gh a 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 of a 4.7-mF capu ni z0ly0d;m8h ev4h8acitor 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 oz)/twpp.h4ej f capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a r3lfk2xpdr7 t2cs e.5o29fgp zeactance 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 rl-552i ogdtvqeactance of a 0.010-mF capacitor be 100 W?o2g -qvli55t d

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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 ahyily;c xd 5w+ -zqwczs0:q8 9t 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.0 W p1q- twbl ko e8zmz(iq2n190 pinductivemnbp2itpo -qz8(e911 q0 lw kz reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor,t h5mq 8(bz n6rm1okkf:f*k4s 20-mH coil, and 1.0-mF capacito: s4r5hfok(nt1m*6 mb fk8 zqkr 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 resistojdqe2kci p+a / .exq1m -v/5bir, 20-mH coil, and 1.0-mF capacitor are connm.i5qk-/ 2eive+j axbqd1pc/ ected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH 5ji 9) 8 g+b8 azq itmhxw+ysnbdr84c6inductor, what is the impedance at 1000 Hrih )m+jq nd+wxy56 ag48 8b i8cztsb9z?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with k a8lo(6j v jo+lw73px08acm/oz lg 0ka 20-mH inductor, what is the phase a6g j0lk8 0m(v lop+a/ocx3 wjk7 zla8ongle 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.c js.g (53f*wa ,q6kubyahf q(vb-ts a series circuit with a 20-mH coil and 1.0-mF capacitor for a totalfb(*qs 56fu.qa(-s.g,kwc3b hy vatj 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 capacitances is needed in series with a 100-Wp0fzf5 ka n) i:cle**k resistor and 15-mizc5l)kfn* 0:e akf*pH 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 pfigd m qo)ci :dz52;0gut in series with a 450-mH inductor at 5000 Hz for a too5dig;0f gqdzmc: )2ital 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 put in series with a 10ega /lbslk9bmw0 d92/0-kW resistor at 1.0-MHz for a total impedanc/g9 edlbs9mwk/b2l a0e 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 isr+o )0n 8g/vj,m9ejy(x3en zljc4 vl-vx*n wg the impedance at 1000 Hz?v/ m eonrn j le*cg0+94vw-lx )j,8vy(3 gzxnj

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is neede10pp *ip au )9jz4mqjj1.tgjc d in series with a 10-mF capacitor at 1.0 kHz for a total imped*jj1 )a pjp0m4p.cz jiu9gt1q ance 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 kHz for 8v/ w1.*)/eq+lkybc oo d)/ n ggyuitpa phase angle )yg+b/o)wq1.vt cu kp e/lyoid/8g*n 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 se5;ns nmjty j :9-6suolries with a 30-W resistor at 1.0 kHz for a total imped 5ltj-mn;u9 y:sjos6nance 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 100-mF capacitor at 120 Hz. What i fmas4tu7;2ujv*49m 7e rrsmz s the phasfz avrj4*r2t 4 s ;m7m9u7msuee 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, 20l-ymkj).skn pp .j q/b0o0k 8f-mH coil, and 1.0-.8o- spl n y0)/mkjk j.bp0qfkmF capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists o./ rbmxe ep4sbu *vv4r/ 9(ffwf a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms cuv4re9 xwf(/vbur*sb/m p4e.frrent in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an inducto tzh wvy s/8tvu+olsd0 /v;3x*r of inductive38 u st/vw/xzyh*t0;l+sodv v reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a/ismd+ w.ortz 1, so7g 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz po r/,wo.i 7so+zds 1mtgwer 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 necesjueuq;0du(rjljdx wlqphv8 71 a(*2/ sary in series with a 500-W resistor for a phase angle of(erj qwxh/ *ajp;l qd7udjl 280 u(1vu $40^{\circ}$ 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. ft-i:80n .eg*c zvral At what frequency should the circuit be driven in order to have maximum power transferred from the drivingvar n0g :t ifcz.e-l*8 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 ah;hy/s5 ;cfa j +xu6ecircuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 1h+ shx56 ;yuc/af;eja20-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 circuit is*in nl +l(e7yo $63^{\circ}$. 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 imk5n4sz0iqo c 4h+,ayqpedance of 60 W and a resistance of 30 W. What is the powe n4ks0q5 chyoi4a,qz +r 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 +0 d+idprio/tseries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to r+o ditpdi+ 0/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 and a 15-* obvb-ls / hhit6;hi92ju- cmmH coil in series?h-i*v hb /cu -tb92so;imjh6l

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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 resonant freq4vop2 p: yti-quency of -qv ppy4iot:2 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 sia9yuo; 55 fainductor for a resonant frequency s9y ;afi oa55uof 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a uov 7hgm b8-4.w/uxjc30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1 8gco.u/-vux m4hwb7j000 Hz?

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