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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://mail.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://mail.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 unm5a cea-mmv0 ttv,)duqm)0.t its 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 stat(h /-fo+an :gyyatp +wes 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 wire in a coil produces wb3cv/v/k qr,nhat kind of change on the c,3r/n/v bqvkinduced $emf$, 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 produces w ul)t;i kq4dr(4sx* j w/i gb0dpw,;nwhat kind of change on tq;44n /pi (wb ;li*wtgw dd0usrxk,)j he induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of chk6 xpr1bmq8adqj -m:+ange on the induced -6x1q:d+qrpka jb 8mm$emf$, assuming all other factors remain constant?

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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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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 f ,f97 7ezcdbvyield 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 anr-p6lnh) , vvj induced current in a conductor will be that whichhnl)rjvvp,- 6 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 e:j:/ig ytf7l e4 -vhjtable. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed jliye: 7-4tgehjf: v/ from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above itj7di:av tqu+ v4j8o9ps center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from aj9vo itqud + :7j8avp4bove)

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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 thzz gr c*,r-jq)e magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the senr)r g*-jcz qz,se of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top s vil):0 urcf/nq)-j gin 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 thisvn :-sfrg)uc/0 liq) j coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnetic fielrcyqs84hs 7 *vt::2g6 a6ycyy4m7xyxty4w s w d points straigh 67msy wq47xy6y :c*y2ha8xv4r 4gtyt:sy scwt down. The magnetic field disappears suddenly. 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 and carries an ever-increasing c+ ;dhio3u:tzvs ped1 +j: bfd 0*at,ql1zjjp9 urrent northward. Two coils of wire lie flat on the table, one on either side of the wt1juf :dl hsjead3*;+ot qv:ziz9+,dp0b jp1 ire. 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 enteri u1d9camh /83qpjhxewhwu..-o c4 yf7ng first. As the north poleq9c 3udhaw-xu8yo4c.m/1h hjp .7 fwe enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wio b(2mbgyqtl,f; +(ayre is rotated at constant angular speed about an axis whose direction 2mylyba ;,gfqb+(t(ocan 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 speed about anff.jg7 tg:,z3i8w*cko t ul k4 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 rot8u7,c.kf:w gt * tifkglj3oz4ation 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.pyzb6fs/s,xxh 48uhl f.p1*e
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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 thax uscif66eofq ,m.c.vv hh20 /.kqi.gt 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 magnetic f9jq02 qyhlu4x ield. 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 e5 duj5 6q,i-n q7*pns -owkvidmm*y-) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acroy dqne-d 5,oq*p6smv-5km*-u j i7n iwss 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 constanth.uqf:u) v3kh 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 transb,jjmp10 t-hxyr9b3 xforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotatewludw60iw..pb2l w 3 qx -g77:gu fpcws through 60 revolutions each second. The frequency of thwwd6.. x 2 qw:0llpfuuwggpi7- b37 cwe $emf$ 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 usa lcbx i-2xrqmph(.r b6w9)(jed 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 that syjz sie z +n51vc-kqmd(+)p)

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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 thv- tt+u:+gn0ih3gpq) kztk *te primary coil then3gpt q+n t-*utht0vik+ gkz): it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains ug 2b)in-+dgd more loops than the secondary coil then gn g-d2+b)iud 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 power77)eocmwr f 7n 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 circngf0u .f3ff5p uit,

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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 a1i zs25 x+8ix /:tfkdvyrv9cln ideal battery of constant terminal voltage. At the moment contact is made with the battery, idz291c / 5yxf+ s8l vtixk:vrthe 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 qg cy,6t80kwkqddn- :connected in series to an ideal battery of constant terminal voltage. At the momen k8gtn dyk60qcqd,: -wt contact is made 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 i9dhz v mhcs 8fo+a 3umx96; zp75uyv8xnductance 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 and re1gvutm):if) ;54dy-uhm gwyh sistance 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 inductz:tmk3lx8wsqglp0 hcs0,*z6 or are connected in series to a battery. The time constant for the circuit represents the time required for the current t z,*x0z30ql w:sltp6sgmhc k8 o 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 conhwd6- 9l+eg jnnected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required f-hln 6+ gj9dewor 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 c1u.y4 y aj44)fe *t*lqzgyoqhave 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 7 6n -)z3xm 0olfmnihopower supply. 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 connected 1 j/7bnv*oyvf 3ya3dv to an AC power supply. In this circuit, the currentv3d o7ny3*jvfvyb/ 1a

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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 whenw6 k),7imret8bxd;3*yo t4r9 qpcipv the frequency isq6 8 m3vic7ipey9rp ;rbow ,)t*xtk 4d 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 indu oe kjqdd/lw(6rr9, m(ctor is doubled, the inductive reactance of that inductorwml6(dqd ,jke (r/9or

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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 y0h+dcn*6duav1 pu9q zero, the inductive reactance ofh0p+ua1nu cvqdd6y 9* 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 conneyn* ex 6c4srm)efwd: 6cted to an AC power supply. In this circuit, the curref :ndc)emr yx6e*4w6snt

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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 chhklfes+u,vv+ rb;w0*r; zild7 ) cpy 9*wdi8aanges by what factor when the frequency is triplefh l,+0 v;z;)d siawwi+d rl kc *p*b7er89uvyd?

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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 - xywo:z4w7l93c+v9pr ohsa9ww y-gkapproaches zero, the capacitive reactance of that capackg7o3:c4 w-wp9w-lzxh9ya+o s9r vwyitor

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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 bet15wqd:*16l lle yhr/3fyehr; b bxi9jween the voltages of the inductor and capacitor in a wqll1bx5 h3r;l9brhe16eyfd*: j yi/ RLC 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 ci7b k*s/ oe lvmp9e5fugqsy 7:3rcuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circui leu(7 qvq.7amt increases if R increases. When is this statement tru77l (quvqmea.e?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases pa-lwn ty -7ngq)7g7gif $X_L$ 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 igg52dk/u5x86 zyz xjf c5oqp-mpedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuit, ;.zrjc)ej 7 yqo*nf:lp ay ;m,the resonant fa ye .rn) ;jz7;*ym:, fljpqocrequency 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 dri9mrt2yqay 6 m):auxp(ven 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 oc--)mh ;wq dccscurs 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 rotatings3ay1a-ml9lvec( -ygh1 ,y om in a uniform magnetic field of 0.20 T. Find the may3o-ymyl hal91ms a, (gve-1cgnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fi ntkqbf6c bs37e7k wd8 t:3hnpf10.xgeld of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendiculf3 6cg s03xf k7 bthe.pbw7k8n nt1:qdar.

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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 magjhef p)2nkuu, k6c/1b*f rms(netic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magneti)m(p1c6j h,seukrf bf nk2/u *c field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is redutz b7 8oad h:/-:foysnced 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 :1p2 vl qpoe+ichanges 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 a 6ixql-t13z;2a . tajm;ndur(m1dhs18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average vam(qt2t3d-1 md aznrl; asi j;x uha61.lue 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 wirt*l3- y+fpic r,.h wgwe with 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 d0fedd;g*i p* u8*u6 qj+azejw f, +wzarea $0.20 \; m^{2}$ 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 ah+ o7m9gcb+m1d8wcj9wvs02hhd z; qp t a location where the j2pwogq8;dcbc+ 0m9 mh719v zh+whdsdownward 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 that is 2.,1 ,ov6li3f9ov v 0gjox2ejsa 0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of it j,9g,xvoa2 3se1 ovfjivo6l0s 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 o00 tq5 zb+)jwu)u vvxsy-l)v4v j,ka-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 j 3t qk qewptg;;z(j segp3qx(0n.7t*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 rkhpf g,a9(i+ntg1m (c7; jj jvectangular loops 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.h,;mi97apj+vn kt1(g(c fjgj 30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns y f.uhaa)y;2wof 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 withawfo7pe3.njr 56c3pn an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050w6pf je7rpn3 ac. 5n3o 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 gep agr-17cl5q 0i /rovonerator 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 motor have a resistance of 6.00 W. The motorrj is4k:jjy44+m:pu p operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operatw;d5 gr, ta* rrmhp y 0w.91x)mcq+nqaes on 120 V AC, and when running at full speed it genermw c;x r5ghndq0wpm1r + ,qaar.t9*y)ates 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 24-Vl.a59u5ev (ehs 1l zycvzjc.*a2zg6e power supply. The operating current is* 1 zs lzeege v2(ujy.l56 95cza.chva 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V poq3dsq; hmv4ra;genx y:.1j c/wer supply. The operating current is egxh/.ca4;q1 sdr: 3qmynjv; 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 24-V power suppla58atd ;4lph nizdx2*y. The operating current is 1.0 A ata nd itd4;8*zl5axh p2 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 transforma .dnct -0: izr)sta(uer is needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to fl4gpj5i(iap 9tow in the secondary. How many turns are in th p5g tp49iaj(ie 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 ,kr. w dj2b 2n:2poxn4xha3xu5*s s uzare necessary in a 110-V primary if the 24-V seconda .wa32xbk ux,nxop5z2jhds*: r2usn 4ry 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 prex( p )2v )r4m.skyyr2 +ntwjoimary coil and a 2000-turn secondary coil. If swtx4k pr)e+y.) rjm2 2yv(onthe 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 primary of a transformer. Assuming6r x nvr 6(n :3dsws +oj0ogxdzoq zq51f;.9ss 100% efficiency, how many amps at 24 V can flow in the secondo o fdr9v qr1sg 0xxd3osjs(w ;5:+zzs.qn6 n6ary?

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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 h/ zt8g8nved0qj6-ocb/ :ezk . The primary coil operates on 120 V. What does th/ z bzj868tv:enqdhce ok/g0-e 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 bpxnhkjcp3 0or73 *p(h)pm c4 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in(c bhp 3 j3kpx4ppnc0)hmo7* r the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil andm4x; el)rw,b 0ob2bnd 300 turns on its secondary coil. If 120 V at 2.0 A is ap4, x ld2b no;bmr0)webplied 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 ture.p)a gm2m lcg c.tu03ns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the outa.ggp)c02mle 3t.c mu put 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 turns. rgpu 2*:bd1u sq d38es If the input voltage to the primary is 100 V, we can expect the outpd 2d:ursuqe 31p b*sg8ut 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 turnfz8cczlyky. v wc4 ;s91tymxei4ig476(c 8 oo s. If the power input to the primary is 100 W, we can expect the power output of the secondary to .t9 moksoc74 i ( 1ci zfye4;gw6 8c4vlxcyz8ybe (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The vol,6;(n+mkwcq b7x6qlxv :xbzb3 ,k vdctage is usually stepped up to 4500 V by a transformer and transmitted throv7xc3 ,;6 lkxzc:bq( wvdm , xbknbq+6ugh a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of c4 yxp* ckn/8azbb2gx ) iyr.x1urrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of totcbx y/np4rig*8ba2. 1xz)k yx al 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 steppe ;g-wgiv 7pulit 6x:3gd up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission li 6ug:l-p;xgi37g viwtne 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 of 0.60 W. A genero)z fgnyzzd r+ 0b(pr+dx(l 41/lmo. y,jmn( pator 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 xbrdjop l+ 0o,.f)( (gyzmydnl/ +r nz41(mpzoriginal 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 g1nkiq 2s8d ijvy:c4*1 dk vdt/enerator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when th /svkn*i2vd4d 1tck1:j8di qye 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.zn -)p8 3fxk/v7va/fwcxe qd0 How much less power would be lost if the power were transmittz )a/ /vcw8xd3nqvfp0xe-f7 k ed 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. ruk8dlb1d,5 vIt is to be transmitted on a line with resistance of 0.60 W. To what voltbv1u,5ld r k8dage 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 muca.b4lckz 8xd; a 2zi9eh energy is stored in the coil's magnetic e k2 9xdaz.bc;4zi8la 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 cq 0 vj;fid8.2 qj+ z29brfr1kk hsf2tqontains a 6.0-W resistor and an 18-H inductor. What is this circuit'vk rffd2zt9;b.022 8krhsjq 1q+ ifqjs time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage x5y faz5lki29 in an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-7 0:n21u j(x nhg ylo29jpzfhbV AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the re0dtt/fn pw:nbu9pbs+t ))0nz sistance of the la:) b/p 00sz u dbw+tnnftn)tp9mp?

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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 fxmz:2su)28,fhp i 0dl9/qv wj 5pteysupply. What is the peak current through the resistor?w5,8 p0u xshd/ fiyj p2l2vtqm)fz: 9e

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the powe( ee amuyf087t kf07di,nna f-r dissip-e0e8uik0 na ( f7fd ,ynm7atfated in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistcwfu frh 6v24kl1e(z: 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 a 50-W4spglo /-3u it 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 resistor i (bdu3b c4s2g xhx+6evs $I = 0.80 \sin (240 t)$. 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,tr/xgbk7z4 a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at b)c tg7xnc2-z 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 inductiv2pe; z utv4i) bdbtz28e 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 necessarr 4u+nnvs02h gy for 157 W 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 5i8 jxqero.9g*t dx h+a 60-mH inductor when 120 V AC at a frequency of 20 kHz is applied tehd8t*o5rxx q9ij +g.o 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 .d-wa in-m,+y8vhchu: -ulni 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-vhix 2 sy9uyfm3 /bbt*73h8ln 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 tol9z3) cjq6yym have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency doet (kwa(juz+r 7s a 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 reactance of 5yw*9ytcwb5 o a 0.010-mF capacitor be 100 W?yo5wt9y w 5*bc

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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 Hz and 5.0 l41sa xkc 0 ,-aggita7V?

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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, 15.0u1erbv2k)+xy W inductive rea )1rv xbk+2yeuctance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH ( /(ccp hc ,e4mkeyz(c6t-tlecoil, and 1.0-mF 64p e ec-k(h(/t eyctcm(zlc ,capacitor 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 , l,0eas .pekoHz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor0oesek pa.l,, are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what issl v(4/nyq7q. uvy+d1r61ge;m gwgbt the impedan 7r1 dv(g s 6+leumgb;.twyqqv/g4n1yce 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 connected in series with a 20-mH nv2:x g a+uo4dinductor, what is the phase angle at 1000g d 4ax+o:n2uv 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 circuit with a 20-mH coilt6)p-/cor4 pgiv oo ;g;s jsv5 and 1.0-mF capacitor for a total is) ;c4t6;go s/opvr-ovi gp5jmpedance 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 ksah4w+ztvox64iy 1 l8 q 3mk7capacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance ofvs+8ho z k4it4673x1amykwlq 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 withle )2mo *aqw4/stoa d0 a 450-mH inductor at 5000 Hz for a totd 2te0sql)* ao a4wmo/al 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 10.tm6zwqf * dchcy7y3dj o/7 0n0-kW resistor at 1.0-MHz for a total impedchyc/z tnw077j*ofd q yd63.mance 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-m eya q,k0uoxv,))) hqvF capacitor. What is the impedance vux,eoqvkqh)0y ),a) at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 1 b:hywju,/ 4jk2yn1ti0-mF capacitor at 1.0 kHz for a total impy2i4b, yu/ h:wjtj1knedance 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 1.0hw 5qh g)zdwlhqr)1 dh5;(l/ p kHz for a phase )qd5l w hphr/ q) d(zw1gh5lh;angle 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 neededgas, (i-twq,,v( gb ws in series with a 30-W resistor at 1.0 kHz for a total impedance of 45 W?v-bg(s wti,, wq(,asg

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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. Wh -gp c 9muqc:)w7+rzqjat is the pha:w ru+- )qcmpg7 jq9zcse 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 1*b , zlo( e.bcxd7upc1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected(u x,cb d*be.cp71ozl 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 consistpmbed8 *;c3yj zsl;a0s of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H ib*3j8cs e;ya mdplz0; nductor. 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 capac9fngz a cdsf5s12i/h *itive reactance 30 W, and an inductor of inductive reactance 30 W are connected in s9sz* snd1a 5 hf/icf2geries 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 circui4z:j8 a, bmxeht containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hj:4 x8zh ,mbaez 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 0jsnu0scjzm- 0nh7 9 dgp4mnd;bd6v ;6:lykx with a 500-W resistor for a phase angle o bjnjc 6g dx;ny0mvn009:k-4 l6z;m7sduds hpf $40^{\circ}$ 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 vf*dnd v o-y4)- 5lngo= 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the c 5yfdn*-v o nv-g)d4loircuit 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 rud6jp5)k+ cfh es-sc1b/vii - esistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when th f hv-c6)-5/d1 esju+cpikbsi e 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 cir/cl y(f:e;zybcuit 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 r6t6f/k ote gc.esistance of 30 W. What is the power fac/o6t tkge. 6fctor?

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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 50-W resistor, a+2d ydtj85qtzu e -ue1 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power eq-yu8j5u12 dz+ edtt 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 acb*zlg-r)v o1 15-mH coil in series?ro- zl bv1g*)c

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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 frr6g(ti5.rmii3 w:1l.ku*hfnhnyh -dequency of 10*.5hhmth: fwrru .kngy1 6il3i-(nid 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 re w *drshf:f,w10c :lgisonant frequencyr1gl0 :c*ww,hd if sf: of 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 mustc6w/p p1 t1njp be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequej1 p/wpt1cpn 6ncy of the circuit is to be 1000 Hz?

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