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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 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 are units of mae5l/yi-h a* i:3 gsitwj9gk u-gnetic 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 stkc lt*v0eso*1ates 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 ofyilk+r, ej9k2 wire in a coil produces what kind of change on the+9ekyj, lki2 r induced $emf$, 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 produceumd53)xbx6d cm;h zgr7mgej 2nu54f ;s what kz5d)j d5mb623x7cg4 efm mn hr;ug;ux ind 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.fk1d+4v jtyih c:qhi3e2 +uy of a loop of wire produces what kind of change on the indud3.tvyf k1i:ic2q eu+yj4 h+hced $emf$, 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 fro6t ,dh,fg +u 6x-tjden.lw hm:m 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,tiu j;t +hrs c+-xd(rs/kx.:u the direction of an induced current in a conductor will be that which tends to :.j(rsu+th;-tx+k/ixs dru cproduce 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 tak9+enxgd+bi0z lw.q6 - 9wr8:eyvdl qble. A bar magnet is held above its center with its north pole pointing down. The stat n.w9dqebir:z 89y+0-x wg6el+dvlqkionary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above )-b speo4+dxjex 1*vm its center with its north pole pointing down, and released. As it approaches the coil, the falli *-d4xem se)+xb ov1jpng magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a tn19oa) g m+5moux 5jla+7 qsoiable top in a region where the magnetic field vector points straight up. The magnetic field vanisheml)i9ag ojm ++57oq u ans15xos suddenly. When viewed 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 levebc2qki+b bs ,b* 1n0fzl 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 curbnq+ *1z 2fcbbs0k ,birent in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a rdh/ gm677 qvghorizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappehvg/67r 7 gmdqars?

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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 lin7 tgls75g.w des on a horizontal table and carries an ever-increasing current northward. Two coils of wire lin7l std5gw7 g.e 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 ofv4f, qh9 lcj/g wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as v v ,qlc/gh9j4fiewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed8wu xfxg2 a(1w about an axis whose 2xw ax8(w1 fgudirection can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed abou .w3y4bh0w:qa;mps 0ewci e;p t 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 e.w0ea;: yw 0h;ib cpsmqpw43the 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.ad.z6xaxti99 n-;m aoxozl/ 4zcu 8l1
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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 th 086sguqy k4 ce*wboz ;3z;qfatwv0m 6at 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 field. Th7gnul ecd9l-1 e $emf$ 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 x68i6tikqc x p, gebhpol1-7)in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statemec1-7e i6kxl tb6hxp)qp ,8goi nt 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 *8rhdt xm1;+;lc dic mrotates 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 transfqr)co r hk//9worms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions e+cyi3yql8m u8ach second. The frequency of the cyq+3mli8yu8 $emf$ 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 used*xo qobh 08gad*6hg) -et;abx 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 ty32lw ss,hwf:jo ny00hat

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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 loopjgmb 1lk71;d uo/;snss than the primary coil then it is 1;jm;7d/lg1 k usbnos 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 n74ujo/+ vddmz(in )q-njid, more loops than the secondary coil thendniund,jm+od i7v-(z4)q / jn 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 powerm -tr -b/*vbqz 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 i7 2*sun r491lznpqrbs0v0xm circuit,

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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 t 5 w-wwg )x -m,oly1fv:oesv+rzt.ii5 o an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the vo5.1z w lvteoygrfxw-+5,v mws ):i- ioltage 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 s 2n1npcl. 2*oll8vo hleries to an ideal battery of constant ter 82olvcn po12ln.*hllminal voltage. At the moment 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 resistance4,k7w u z6v(*xjtk nva8 konf/ 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 witrxjhtsoe: +,vz qre tr/5q2e yup-*76h inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are cga, s9*9t1dr by gt vrid(8fe,onnected in series to a battery. The time constant for the circuit represents the time required for the current 8r t*i eas ,,bg9dtry(19gvdf 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 cont2kpq t 163o3u7vete qnv7 a9wau2z8vnected in series to a battery. The battery is suddenly removed 3qapnw8v tu7v eo9tak16z7q23ve2ut 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 have 8: ed xifo1j.wthe 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 supplyw/;4 kb(8 oogw sodmnw7:jgf* . 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 to an AC power supply. In thiohmy.6dn 1(n n:7sfnim +xv;hs circuit, the currents ym +nnf6o(7 d;v nxmh:i1nh.

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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 thcx(2y, ludwjs 5 ,(kmqe frequency kdwcj uqymx(l, 2,5(sis 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 s y;fvki)on*wwsd :94is doubled, the inductive react9k ywwsn;i vd :)4o*fsance 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 vt ,finr;7npxc4x7- tn2 yrx1moltage across an inductor approaches zero, the inductivf ptr2m 4 i;-n 7xr,nxxycnt17e reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In t7;:svjeebv7i ) -m0 ytdw)heahis circuit, the current 7 e )7;-tesehmw0bdviy:vj)a

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance eie-l 5 o81bu-( ljxpb.uvs7d+ ida:min an ac circuit changes by what factor when the frequen.xubjd5elmu1i-(:-d 7+ iabe osplv8 cy is tripled?

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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 appkfe/d z /h( 8px skktgna-1 0jnu-yld.-v3rm 9roaches zero, the capacitive reactance of that capacito. kn u8rl0jm kys-xv-zad(ektd3h/g9/n1 pf-r

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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 angv 5ikkk8cqj5 3le between the voltages of the inductor and capacitor in a RLC series ciq 3ck5jvk k85ircuit?

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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 de.y j) goxklw8gfj)2 0iq s7r/q*+ vamkfined 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 ciikzlw ipp m eib o9z-;n.8t,pzp6b3;+rcuit increases if R increases.p.zmw pbk tp-, 6 i9;ebop8lizi n3;+z When is 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. The impeda k mma(tm- b71se3cb.s;bm5 zyk-tzq ;nce of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit increasekryh41cz8g ,j lr2 tj6s 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/in e9 u 9k*e;.7o5abbzslxkv , the resonant frequenck9eik*b sn;x95oaev.7/ zbu ly 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 appli4za gjm1hebx :j+:rn-ed 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 RLvs(n u,0 uoy wpr)e,;r):r uyiC 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 rotating in a u( rrv6w 3h5ua p6ek3rek-g:xf niform magnetic field of 0.20 T. Find the magnetic flux through3vr56ghu:awrk(-e k3e x fpr6 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 mag l1k)d,obzniqz 3r.; t.k1 f r p(;y3ze5jjugrnetic field of 0.20 T. Find the magnetic flux through the loop when the (.j1p .3rdi1g3zy bjrz qeuo ;k;k5zfnt,)l rplane 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 v.-*te0yre*1va/kz kxk:s kd magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field e z -v *: kyt1ved*rkakk/0.xsvector 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/n h- m1mgysn;3w4zvtbj z m4yuzr,w;( f4w(w 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 coiq+p q3k6/w7g gplknk 1r8h)jhl 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 286e30 wuqd4xzby fo1z 00 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendiculabfwode8ux6 z 3yq 104zr 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 wit*)(s mig)dm aeh 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 are+fr*-cemp ( p2ohyobqfq22h . a $0.20 \; m^{2}$ 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 horizontal*xb,)puyl8jv+1 cxlm o4 5uk xly at a location where the downward component of the Earth's magnetic f+ 1l)4,* oyjb8xx uv5lxmkcupield is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at bie edg9 ,+tasdv./j ,a constant angular velocity of 2.0 rad/s about a vertical axis throus ig d/t.j, evdba+,e9gh one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and y 9g: szyi6qfc89uk;u 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 cons,/)qjdd*k1 qc qg)oaeists of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. gozuia;1z 5we71k)4u-q mczk Each loop is 12 cm long and 8 cm wide. The armature rotates at zm57kzu11o;e)4a-ig w cqzku1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage 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 of wire m z/1njx8rs2b2g7dft of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an oum3)(qpczshjjhqtwr6 c*b6 00pj 2+n ltput of 12 V maximum when rotated at 60 Hz. A magnetic fiehcpthlmjrqb *c3 (600wj +j)ps zq2n6ld 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 gx pbf:u 3kdl.yf71.sq/ svm4+cvbo*w enerator 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 moto kdvnciv+7 aapo n6x9+, 9y x(pl;jg+ni4 /kyyr 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. The mot;h7b b,df9brn gy2 cfo5c77 xsf.oa+qor operates on 120 V AC, and when running agfy .snqb ocdhc, obf7 b+;5r27xf9 a7t 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 resistanc:2yvql5ud o 9da6d5 ,ryru, p v(tt(xke 6.0 W is connected to a 24-V power supply. The operating current is 1.6 lp,au9o:t,(dudv25 v(yrk5dxy qrt0 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. Th 4 yj(;.cxad *jm bdt2*nlai4qe operating currenidaqx; jjl4ct (n4y*d2.m*bat 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 remt04y.c/ tl lfx8/ cazsistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is tlf y4c/m8 t/txcal.z0he 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 primacq omr7sq /7r+id3p 3s7rtps3b 6fd,dry 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 flow aifz6e11 r1eu;x ,8i cuik6k vin the secondary. How many turns are in the secondaryi 1ze;,afex 1u8krc v6iik61u ?

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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 mac cb0b+gqm2u vypn*7 :ny turns are necessary in a 110-V primary if the 24-V secondary has 100 c 7 pu0+v:y2 bmqcgn*bturns?

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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 anyrx,hs) a s).s 7egy:zf5it -id a 2000-turn secondary coil. If the current in the seco)7z )ahys,i gftr s-iys5. xe:ndary 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. Assuming 100% effipo9.jgypw(/f. 5ox z au72uyzciency, how many amps at 24 V can f7zg2.5u (/ yfwpj9pozox. yaulow 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 t:4o;jd nsae -xransformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the priajdn;s: 4o ex-mary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turn )j,jjbe 8:zs9tlc ca3s on its secondary coil. a, c9j8zectb):j3s jl If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its souoc p 70tgwtik j8098econdary coil. If 120 V at 2.0 A is applied to the primary, what0w8uott8o7k p9 jc0gi 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 hk;d hdqgm.7 b. h1 rxx8*3vyqhas 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the seco.h dhx;ryhgq 7vmk .*q83dxb1ndary 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 turq ia s h8m5 t317rmv5p,z -vqdan,wma.ns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secon i7da,5az, q 1m.mv35sh- amqpv8nrwtdary 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 sectl;4pmb22f rcba +newd4f x6 0ondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losspemfr 4lfdt;4+nab2c6w b0x2es)

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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 voltagr-,wph o zt 61y naps.w,ie7j-e is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the s.ay pw1zhet7 -6ir,w -json,pecondary 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 voltagkxmi)m-k7o l8az9x /sn6ecg,e is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistancg x- im e/zkxam,7 sc)9n8lo6ke 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 usuae zwg4dhmde/ d1d,i 93yv s,7slly stepped up to 4500 V b hwmv4zd7s ,ei1d/,g 93deyd sy a transformer and transmitted 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 total resa,ee tf y+f y8.2lqr7xistance 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 of 100:1. What percentage of the original energy woul, yxtq.+7e fr efy8la2d 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 unatbv .r2o7vzj k)94-a e0n(o9w npjresistance 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 of 100:1. What percentage of the original eoj09ukw tb47e.)n v a(jv9 z -pornn2anergy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. wcdp hx6. /-:bb5lmgoonxt r ag)43 l1How much less power would be lost if the power w- xg31:/ b6aw drch)mx .oobpn4lgtl5ere transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. ae,it9s8ixpt7 y *f);nox w(c7,lqkz It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010kqx ;* oz7x,y p(cnial se) wfti9,t78% 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 muchl,7yw(yykk 0 ;x4obgw energy is stored in the coil's m(lk,kywwog04;7 bxyy agnetic 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 conta3y nh zps1;dp4ins a 6.0-W resistor and an 18-H inductor. What is this circu3nh;yp1psz d 4it'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 the rms voltage is 12m x;sv+r:hbz80 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is 7j3 p0myfxny: 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 iny.*kx3f- kfvy to a 120-V AC outlet. What is the resistance of the layf*x .fk-ky3v mp?

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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 pow rntkr0xh775jer supply. What is the peak current thr7h7xrjr0t k 5nough the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the power dissox4bdg0(jqd7 ipated in the resistor?jb gqo0 (7x4dd

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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-Wo ml 51 fdt/qjwq0b8k8 resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor pdw3izhwp 74 r.dz((ais $I = 0.80 \sin (240 t)$. 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 resj3ynvagq6uw* 3 p2ys8istor 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 1.0-mH inducto1- o/de*ltmyi r 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 coafe7jq4.hij9 q,* yq nil 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 qq7bb:ftdex r k- *3e4have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 1* atjy8 s:pta x/r2si357 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 a 60-mH inductor when 120 V AC at a9 4ufb gb5avv4 frequency of 20 kHz is applied t bv gf4ab459uvo 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-V *yqbiijmrf;yt-h. 9/ , 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 cmm667 leif,7dho; iwp apacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at 10 b p9rg3* j/s:n inaf5 dox1uk: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 capaciwmyba0plh5 qvl2.n48 tor 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 a 0.010d04ndd : pbrupk) p,k52dgy t7-mF capacitor be 100 Wbud 2 k4kd7:pptd )0 prgy5,dn?

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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 capa uz8n 5*1jyjxf yo;6kvcitor 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 1py7b7kxa ee0:u 5 jf8h2.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reacth u87a7bpefy xje:k05ance?

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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 1500co -ff95)kd gk Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected i 5cf-kofdk )9gn 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 resistor, 20-mw(o5 9wz* s, e6aqvt p6rfy+79dac ebuH coil, and 1.0-mF capacitor are connectedpaabrdqf9s o7e+e 9czv6*wuw6 ,t(5 y 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 inbtwj-2i 71k yoductor, what is the impedance o2 -tjyk1biw7 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 inductorw;3hqyvyk1g4 , what is the phase angle at 1000v1gk; yw3hyq4 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 coil and 1.0-mF capa)b 6 gr:x5jhflcito: lb6xf )hj5rgr for a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series + ;53vmm3u0kxzlkmm3jn2 ukh with a 100-W resistor and 15-mH coil to g2 x3v5;m3+ ukmk03kzhnjmlmu et 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 put in series with a 450-mlv yf4,.3oeu8m5 pb wpH inductor at 5000 Hz for a total impedance of 40000 W .4umwfop 8 y3v5eplb,?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must;se2zm hyg s ys054mp(clee 6, be put in series with a 100-kW resistor at 1.0-MHz for a total impedas zssmm (l;0 4c he6p2,yy5geence 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 ca;rqrs*vn7ierf m0f :l(ot+0 ;qlx-c jpacitor. What is the impedance rstqlf0+i-c;ml ;o: *v 7 0er fqjx(rnat 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 10-mF capacitor at 11w q;vlc*u1f8u9*ufmb :zlp f.0 kHz for a total impedance of 45 lp;f m1bvwu1 9zlqf8*c*fu:uW?

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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 aw sjm//eex0kc8lt - v: phase angle o/vc8/e jtwe:m- kl 0sxf $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor bw9eyn5 *)5 m w3r4yrfbuxd9xat 1.0 kHz for a total impedance of 45 W5bw45)u9x9xdr *wmyn3byef r ?

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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 i e)ego51s3bh gn series with a 100-mF capacitor at 120 Hz. What is the phase agh5 oe e1gsb3)ngle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resis jepyc gw0+o)6hkm( kqx(n,++q1tqq htor, 20-mH coil, and 1.0-mF capacitor a6,+xq qk( gpqoj hcne) m1++q0w hy(tkre connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a wyv 0 pyy1s:a/p6j7qf10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 1216: wv0apjyqsy7y f /p0-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reboiz 86 dhgpe4k;9 idcx)/d9dactance 30 W, and an inductor of inductive reactance 30 cobzk4; idd6gpiddexh 99 /)8W 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 50-W resistor, a 1 :bb -nh:c*em1wfuth7b 2w,sg0-mF capacitor, and a 0.45-Hbh:mtcbu*-ehwsn7,w2 bgf :1 inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase angle o9 .hwla)t14-a uf7y 0i7 xnhqin wjz(pa0i9hw7wfupj-1z t47)l(nai n yhq.x f $40^{\circ}$ 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 5 z xnoau9bi20i+sf0z mF. At what frequency should the circuit be driven in order to have maximum power trans0oxzf i+9sanu5 izb 02ferred 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 infl4v 5ilac;2e an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capaciti54;l2 l fvceiave reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit is ): s dkd1a-,3yh pbsnpv 93cmu$63^{\circ}$. 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 6ob;n d +;tuvi00 W and a resistance of 30 W. What is the pow+tinub0vo; ;der 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 circuis6 wydyso*v:u :5wz.w(6 obo ,xg;cqyt containing a 50-W resistor, a 10-mF capacitor, and go,6v6oyz.oxd*;q(cwwwb :y us5 y:s 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-a1afir296/icao3 zknmH coil in series?1 ona963 rifiz /ca2ak

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is nee+mwp.kx ,mm q --p1qwm(by.t)dc9uym ded in series with a 4.7-mF capacitor for a resonant frequenmmy+qtkm- (w,x1 qymumpw.9 b-c)dp.cy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.dzlhva6fu5) 9 bs lv:age8s;.7-mH inductor for a resonant frequeb lu sv.8a9;z:f gl eh5sd6)vancy 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 must be placed in series with a 30-W resistor and a 40-1slqa 6lmv o5s9.tr. zmH coil if tm5qrls.z6tva 1l.os9 he resonant frequency of the circuit is to be 1000 Hz?

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