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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习来源于题库网 (https://tiku.one)，是在线习题练习的打印版，您也可以访问本平台网站(https://tiku.one/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 80 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；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。本试卷的直接作答链接 https://tiku.one/test80.html
 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  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 areq rdoypkt 80wv18 l6unle3;9b 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 inductsuytghy dsuj 58,pusftf. bs21v 1+-*lujc84 ion states 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 3za0rm)b1iq a dym0:y coil produces what kind of change on the i0 bqriy:01zdmmay)a 3nduced $emf$, 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 p .y/ea5t2bbqrroduces whatb2ytb5ar./ qe kind of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change onawqp)4n7zzxb : :eo 4r the inducx)obwq7::ae4zpz n r4 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 f6 ntb6ojvwx8 2rom a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conductor7cimc);1f dnj1 zaga) will be that which tends to produce which of ad1nfi7mga ; )c1zj)cthe 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 t.zz + sfvvnus;1a9 eg;able. A bar magnet is held above its center with its north pole pointin ez1;vg+s.nfu9v;a zs g 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 oatpie)9c69 m xfj1:eq n a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces ei9fjqme: 9ct6xp )1a(when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic gimf/25k t6 4uivk;hjb(.iuuew;9fr field vector points straight up. The magnetic field vanishes suddenly. When viewed 2e u k 5i.ujfrtiku f;/9 mv6gwbi;h4(from above, what 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 level5oofv ro4ge(7 table top 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 this coil as the field increre( oo5g7vf4o ases?

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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 regionvlidohlge6)g+ +r)g + where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the inducedlr+gedghl+ ) i)v6 g+o 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-i.ta j/w7vci0 iueec :1ncreasing current northward. Two coils of wire lie flat on the table, one on eithe: c/jiw 7e1t 0cui.vaer 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 t) o i3pm1z+ *ivzgman al/4rk15m9oswhe north pole entering first. As the north pole enters the wire, the induced current will be (as viewed from above)g*z+imw)i3olv91 a1n z5s/ m pkaom4r

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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 speed about an axis whosf cf6c 9 ;ujz 52aiec/v*+rxhte direction can be varied. In a region where a uniform magnetic field points straight down, 9f/;2+ zejtr fca5ivu6c* hxc 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 co6 rj(jf1rmu p)nstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight dow r) 1(pufjmr6jn, 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.y bueb9y :qa+1ti9d6f
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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 thatat-rpop0x1 9 . tg-rdd0gv2cb 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 magnetir.og 5+ 5se9rhn-vm p n y4m.edqab:5wc 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 (orienb7 cwp0ux2 wo:jb4 .rgted in the east-west direction) is moved northward at constant velocc4box0:jg.pw7 wu b r2ity through a magnetic 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 utp)i7gp. ;m lp2v)paat 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 tran9;i-by th w6:rdvrlw/sforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frequencyd/.y, qjvgk3 d of the /jy.qk vgd ,d3$emf$ 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 s6b+1kqjmmt,izv+ a*used 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 dev-dsm ;n)fld/wice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the 4qj8/fybjor0 x fv3hln,; f8tsecondary coil contains more loops than the primary coil then it is a8j4tqn8/0rfh ;,ylxovf jbf 3

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secondtgu3e,l um ag3;5y+igary coil then it is ag3t+ml gy , ae53;giuu

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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 pf c ):-q2wv/i j cpte8:kgkmb6ower 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 cir2(tpj+g ty.2 -a pwyr4(oyu qfcuit,

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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 seb +di*nz (*qjsries to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acrs*znb*+ q i(jdoss 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 battee -,dg)jksatn-l;h0qry of constant terminal voltage. At the momt0 nj;),adklse q- h-gent 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 inductance L and resistan4 .zjr/xg.uf z s9xt1u-zuao7ce 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 resistance R is 2xy/hn4f6 oz oek*uc3alxafs,/w h9)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 connected in series to a battery. Tjntfe/uy *a/j,m 0k4ghe time constant for the circuit represents the time required for the curr4jmke// ,ayjfu nt*0gent 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 ij7 srvf s.15zjn series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required zrj1v75 s.jsf for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units excbfy8fr/c4q,c ept:

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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 this circu8w8tw px 7s1 ju4(b0w8rsgvbtit, 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 supply. In this circuit, ta;rt/ tsd0nv9b 7o j+xhe curren0sdb/ 9ajotn ;7t+ xrvt

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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 frequ;c7lai 9qw wzr3)hea9 ency is 9whirqw 3c9z7ae a ;l)tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doub*m: +lui 5,s,l yvefvbled, the inductive reactance le +i5sl *mu,vfy,b:vof 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 i hr1y4ow4w;n the AC voltage across an inductor approaches zero, the inductive reactance of thr4wo4inwhy; 1at 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 bx 4j ;e0si(o/57oksmy6m0cyqpn)g8nq9 hp gAC power supply. In this circuit, the currene9j(6n xg0q y kpy0pom8 hob7s5gm; niq)4cs/t

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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 facto/ ),daxa3yj.3bsy2g r 1r.u6uu(sqcwa; ysfor when the frequency is triple6dssgrwj/q2urf,c)x (1yu os3y3; a .uaa b .yd?

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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 vob.rmfe8 +oguo46/dl zma 8sf7b;x7tv ltage across a capacitor approaches zero, the capacitive reactance ofzmv/d or+4 st7olu8bg7m a8;b.ex6ff 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 t6g2d;v ytv dssv.)mz0he voltages of the inductor and capacitor in a RLC series circui 62 v) s.gms0;ddyvtvzt?

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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 defined a;r qha.op; b 0s/o6lehs $\cos M = R/Z$, 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 ci2m vl)0hcow 7drcuit increases if R increases. When is th mlch)dv2w7o0is statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance ofs0b busfky.sia*0 ,n5 the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuhp9rx s 0br0tsb )sse+m7:l+xit 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 2dwxijat-b1;1;lma o series circuit, the reson wl;tb-d1xa1i omj; 2aant 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 AC3 lssgfn5+;b z 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 RLC9lcxl.ebhf(fhy-o wtc(1: al35+nzu circuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotatia7 89g7uuu gxlng 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 parallelugu77glx u9a 8.

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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 field of 0w.*ju p,q/vhn) ajoc 8 f1m(ff.20 T. Find the magnetic flux through the loop when thh81c vojnu /ffw*,f p)aqm.(je 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 radius 0.10 m is rotating q xmf;y 2*+bdtulfp. 3l4v)prin 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 at an angle obdl)qmfrxty3 u*.;p4fp2vl +f $30^{\circ}$.

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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 adjustablez5yaor6n +ws- 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 changes frhjtp9t,- g t,oom $4.0 \times 10^{-5} \; Wb$ 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 squaar:pw7qwh tlsar2,odj :/jv 1 :)rc;nre frame with sides 18 cm. A uniform magnetic fie:7) ;rlj/qwcwoa hvr p:r ,1dt2anj: sld is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire w + 8xzgnpm-2ef7p toty;za)g 7ith 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 aq7 ls)l/)wb9ybp3tql/n4 ojgnd area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 ,w v b*/j*f/8d rljsmsm flies horizontally at a location where the downwarv*jjs,/r*s wb8fl md /d 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 ba p )w,bctu6cxw o.40p; h/ xyu utncdx*fi9v-3r that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis t 3t4o-;wcuc fuv9),d c.p/uy6i t0 xnhbpxw*xhrough 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 5 bajhqv-t 4iq(8wj3 -nmo(w /z0 loops 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 b2qi qh x))emd q :3)+o/jtgbjof area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops,9 ow/hi1 qc*s qbpko* 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 ro9*wop q/,k i1bhqoc *states in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 15j h tb-2uxhl;wxbv4100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator weat i: x;z:w1with an output of 12 V maximum when i;xewwa:t:z1 rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maxk b-29d e hna,angdn8fin57,k imum $emf$ 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 motor operates on4st c v27jiap 4f2xd;x $120 \; V$ 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 6.03 cck)p *(5 kshdnse.08 cuofb0 W. The motor operates on 120 V AC, and when running at full speed it generatespf3 d5ku0nho 8c ss cbe*.c(k) 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 intern) fa7mn *5cwqxal resistance 6.0 W is connected to a 24-V power supply. The operating current if5 *)mq axcnw7s 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 power supply) h 1lzrp0y*s w,lk4o4ay5xly. The ,hkl sp yx 14alyy*rl5wzo0)4operating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to aj bc1pwgu1h71i6 fb m- 24-V power supply. The operating current is 1.pb-jc17 6uwmg 1 f1bih0 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 ise0; yyco4fgbnmp k;/1yya9s- 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-tur8s6 -sur x hcwqwy2ul/ :na(r3n primary of a transformer causes 14 A to flow in the secondary. How many turns are in thlywaur6s/x-:rucsw(q238 h n e 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 in a 110-V primar1y:lw di9/ f10opbo zcy if the 24-V secondary has 10 zbwco9y /lpfi1d1o:00 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn second7f/b ./ ouvrfcgc4. nfde;4e jary coil. If the current in the secon 4foce/fd74 ebvn.cgr ;u.j/fdary 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. Asske ikgj3e ,ae7-.9r0j a .azgwuming 100% efficiency, g9z,3arae7ia g -.e wkej0.jkhow many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. T/x h8w s+sjfnt 8e.zergkm.xl-;7 n 9khe primary coil ope + g ./.nmxw 8k8rnj-;k7exs9 shftlzerates 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 t z*nk 4:*-)qix6jzzzo z*toq wurns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the s 6x ko*z*q 4 zo-i)zz:qz*njwtecondary?

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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 turnsrs j3jzo-9q xft)na2fmv1 )r4 on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, whrnf ar12t-qv) 9)fm jzoj4x3sat current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. I74*w) /geyvw4ltsi ryf the input current at the primary is 100 A, we can expect the output current at the secondary to g7wlrye)t*s /i4y4v w 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 hr8z jtmos,4 mdq )f*8bas 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to bdfo)j8 zt8r4m,s*bmq e

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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 transforme 28 z. 47ewaiyeezq:gfr has 100 turns and its secondary has 200 turns. If the power input to the primary is 100e aew8.zq z g4ifey:72 W, we can expect 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;xjl72fola*h5 ok5t/-slus/ io 0f nu 60 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns ot5lh-s7; f l* xu50afi/uo/jn2kol sin the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usu8w4owk:d flx w9lv*4e ally stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage dxw4ko f:9wl4 wve*l8 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 volta/umod cj1* vh)ge is usually stepped up to 4500 V by a transformer and th*j)oc/m uvd 1ransmitted through a power line of total 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 long has a totcm4y5 v- xlou17px 7 mxsfo tqsb-3u*:al resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to hep5x-qu4x 1v osusobc3mlm*x-7 7 fty :ating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0. p yx qq75l:2xpy8n)y8 pin*gm60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating on *8pyi85l7 qqpx 2ymxgpyn):f 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 the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at uueit-7+v5 bk1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of a vkt-u7iu5+ bet 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 bqcq j 5emizb1(94;bmdjg 7kn+ e transmitted on a line with resistance of 0.60 W. To what voltage must the 5(j;+ kcqmnme 7 4zji d9b1qbggenerator 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 stored0;ftryqw9jr 8f s fm/9 in the coil's magnetic fief9f0/f8;yr w tmrj9qsld?

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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 conta,nni)rn2skl 5n7gx a-r3 xb g4ins a 6.0-W resistor and an 18-H inductor. What is thi4xsn7 2rxbk,rn i) ag -g35nnls circuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where t/f5 a3hmk gtmjui/4n(he 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 placegh)hm8 k0hx 3/a wtpj(d into a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What isil5n5w a 5()9hyjuyi8 tuf n2j the resistance of the lam5tj)jawuy fl 89ih(uy 2n5 i5np?

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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-sw 6f9sxr9qq4 op/la *V ac power supply. What is the peak current through the resis4s *lf/9apr6qq ws9oxtor?

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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 aciim)aqwq b:jxe 6h(hx:92d/q power supply. What is the power dissipated in the resist)x/q mqx926h eii:dj(q:hb waor?

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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 resi ,vsc qi 82p8jde8 hmvdw;k.v)stor 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 resisto ktg va2q(m ipbr.q*h; *yb)8br 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 resistt.g0* a/sc,snxk- r7;izghu tor 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 aj8r. brc n/z0w 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 react7my360 r jwhjeance of 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 of inductive reactance?-vbg*5cava3v sij 7*3 -vodtiod 5az2

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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 induc+ r.z4e t*bff 2d.s0phgx /ludtive 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 pw 35ph;8vrb ia 60-mH inductor when 120 V AC at a frequency of 20 kHz is applhw v i83prb5;pied 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 a 2.50-mH coil due to a 110-up(5+5 zhn.gm5rf+ .fa a kipnV, 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 capacitorfpmzp c u9;,4d 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 o 57gso6wt(oawx p r:-wlq ay89f 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 haveay61nk 9szjao+ (( lfyzq7k*( 7eblys 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 a 0.010-mF capacitor be 100cz8io8rat 9k 0try jc2 4fd*0a W?ktrt0*da98 j0fac oi 42rc8yz

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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 cap6 k0;v,finkmcx:: oyy acitor at 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 indh fvaw98cq vufbo0io0 a2 k(+i;dff+1 uctive reactance, and 10.0 8dof aiwovfhvqiu 9kcf0+0 +a;(1bf 2W 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 1bdidx7ffj543x+ f6nbc/ p1mv00-W resistor, 20-mH coil, and 1.0-mF capacitor cjf5bn 4x/1x+6dbpmfv f3id 7 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 anglzq(o jj9n rw f7l1:82kiuflj1 e at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are co f1r q1j7 8wj(uokli:2njzfl9nnected 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 in+euqx7 e*l++2 rxgn jix b69cgductor, what is the impedance at 1000 H+ggxiju*e +27rneqcbxx 9 +6lz?

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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 inductor, what i4q41rrnr6 79n ipjk 7pre2qafs the phase angle 4r42176na e n9r7prq jriqpkf 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 circuit withc-d 3,(b lsjrw a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W a3 (lbswjrc,-d t 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 s0r/ ,rtfaee/ieries with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000e/ 0artiefr, / 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 450l n8 nw /kprm* 6p+xfn.;uull*-mH inductor at 5000 Hz for a total impedance of 4000;+ wn kn/.uup*rf6n8l px mll*0 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-6u s2fi/h.c rhMHz for a total imi 6uh/.2hsfr cpedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is the im;zjsd30t x 0;cwwee5 upedance at 1000 Hz? xz5etsw;d03 0c;ej wu

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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 capacdh1xje11d8 zf 8hvuhu 0mk* gb)+qs,witor at 1.0 kHz for a tota 81mh,ds+u1zhqkhb f0gu1*)8ev wxjdl 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 capacitoizj e k8cedc hp3:28c,r at 1.0 kHz for a phase an k28 z 8,d3cjeei:hpccgle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W rpola4bczho , ;j 4me-6esistor at 1.0 kHz for a total impedance of6olhb , -e jm44czopa; 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 a*a:zxn-*;jq ox6surn t 120 Hz. What is the phase angl*n;orq-6xa: xnzs*j ue?

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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 9 woek+hp v+gx:,- bftif a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conneohtbkx:wv- ++f e, gp9cted 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 c9: rn q1*nrforapacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms currefq*1on nr9rr: nt 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 capai4i: r,o(cgk(k w 5qdccitive reactance 30 W, and an inductor of inductive reactance 30: (gi5ckkiwrc(, od4q 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 circui4 2ezw/ck hh2r .hces8t containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H induc2. c4wck8zhher2/hse tor, 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 necesyj b.cj,htlj+09 1k qesary in series with a 500-W resistor for a phase angle of e .q0t lk9 ,jhcj1+ybj$40^{\circ}$ 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-mHi p ;;odrkn7/v+ee lx 1iauz6:, C = 10.0 mF. At what frequency should the circuit be dzekiva6rnp;ol7 +/i1e;d : xuriven 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 resistance, 15.0pv*z:g f2 . dza-xp4gt W inductive reactance, and 10.0 W capacitive reactance, w pd* gzt :gpv2a4zf-.xhen 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 an3: ,w rqu 1q-cuhk9ejk AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance oxy zb(gk2/lu 9*b:q07tfzgq7a t,ed rf 60 W and a resistance of 30 W. What is e(/r zuy* gq2f0t xza7q7k:l gdbt, 9bthe power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circ1 +2tvrva ia2luit containing a 50-W resistor, a 10atl2rv1+2 va i-mF capacitor, 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 and a 15-mH jd+ h,af64x gvq n8 -x+gdaei4coil in series?i +d46+8f hd jxgxe,n4gaavq -

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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, 0c ct7fcq+ab series with a 4.7-mF capacitor for a resonant frequency of 10 kH70 b acc+ftq,cz?

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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 resonant frevl/guz2 iw cxlg)nfh4 9+k9u- quency ofuhuxin- v9/ 4+ clw9)lkfz gg2 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 30-W resis+7l rh dez cy 1c/9gh+zgcz;;stor and a 40-mH coil if the resonant frequency of the cds hc/ clrg+zgz;;h 7+1ze9ycircuit is to be 1000 Hz?

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