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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 magnetic flux ex/jrm044ld6u 23d 4ziieq o gklcept

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states t lqb5q-s;:jbi)( tyl hhat 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 what kind of change ocl6a qbr66k3 b(1 miyln tbklq mb6ac1 y366 r(lihe 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 mhe, -i1c6(rf-gt +/gfqay0uv 0r utzi agnetic field through a loop of wire produces what kind of change on the inducedrh6rgt-gca1 i t uzqu0+ (if ,v-f0e/y $emf$, 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 w2wdaetw8 1i)v65br i aire produces what kind of change on the indu26)t5vr 8abi1waid ewced $emf$, 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 :+qpc8j- sogjb z75uobrc: k3from 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 conductor willsnca4b 6sox0r76jkfd -0 u4raf. k 2dg be that wk2fcu. 0 g06d k-dnsrjxso6ar4bf74a hich 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 h/73hs z-qiemhorizontal table. A bar magnet is held above its center with i/sm q37zhhi -ets north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a h 3i r10tw,.lt omldc7;ngbcr 4orizontal table. A bar magnet is held above its center with its nort mw drt4nr cblilot0,c7g.;13 h pole pointing down, and released. As it approaches the coil, the falling 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 table top in a region where the magnetic field vecahuk5sd ,20t 8+a/zgpfsmt t6tor points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induce6 5t,2m 8puh0adzts+ga/f kt sd current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnet+ 3mhu3tkzf8vsl3 q/yci 8o4**xqksa ic field vector points 8+h fxl3mkyqvz 4qiac ut3ss*/k*o83 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 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 horizontalpb,./q3fajp ow0mj6 m 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 disaq6aj .bj/m 3p ,w0fopmppears?

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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-increasin:kjvov gec0 4v2m;,rpg current northward. Two coils of wire lie r,jv4c2k 0 pgeom:v;v 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 lt(k .gp szf8csn aa*-2)u6u xvoop of wire with the north pole entering first. As the north pole enters the wire, the is8( c.u- f*gakp ntx z26vsua)nduced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant ay)k;h bns ) fh(,.eg2ahk +qctngular speed about an axis whose direction can be varied. In a region.e; ()+fsgkhcy ) tqkhn2,bha 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 vyg *omebw5a95iiz3 )is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what mus3vi wezm5 *i9g5ayob )t 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.o+ qnzi+.n4bg
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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 jl9fj kvz y6bgjm7-p)d36nfi,f(u e) that 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 ma(p9j 2u42kqh id.teqir.;k vp gnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented inw9nhh,o m +qt;l v:7t.;reajh the east-west direction) is moved northward at constant velocity through a magnetic fehjr ; lh,9wom.7;+v ttn:qhaield 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 at a coci pedhfy90wa)4eq 5f1bm,t,.u 3hqr kvzm 2 /nstant 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 transfo jccw zi)3.wv9rms

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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.cb-9. ux nogy2 The frequency of thex-y. cu9n go2b $emf$ 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 usec) dlia+c/av2d 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 th 5x3r.ibxy* 7 ehrkf9pat

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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 contayw4-z+pqc 0mh ins more loops than the primary coil then it 4cy -w mhp0z+qis 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 more loops than the secondary cot1vp giv8.fnd slr.5y+/z7yr)2 ydaoil then idtz2 vp ir7ny+ l. v5)y8ys1/ofga.rd t is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inputw3;nln8vl2wqqg (0+stp . tst*y 9ypf

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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 circuit,s(x. t ahnp)icjkn tt+ ;a0,7 m:cdc. e8)zjue

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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 sermoa) p3cx p8e)ies to an ideal battery of constant terminal voltage. At the momex)p8ea mo3 )pcnt contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connbt0n-/(ab 8uw mke h,za) hb- tvf3o*yected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battmy*8wht u) h- /kvbba3z o0ntb (e-,afery, 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 indu .m/p2-kjqzw mj* fa+oc8a /x ia.4yzwctance 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 resistance R is connected to anw0l) kq,u itdg7vs./ n o,lhj5 $emf$. 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 ae)uui. b 8zh*vre connected in series to a battery. The time constant for i)z huuve.8b* the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to fg; djln.d c/wtl +9(ja battery. The battery is suddenly removed from the circuit. The time constant for of the circuit reprej/lnd+9 fc . d;tjlg(wsents 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 the same uniq(h3vw +gd+ fots except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, tri/e 215p-c/t ) flq) ugzbeuihe 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 pny*k e,d2rx0eower supply. In this circuit, the currentxdn 0r,2 ke*ye

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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 circuimhle eo 3i4l,bummtlk b;,6 9;t changes by what factor when the frequency is tripled?l leimm 63 ;m4,,eu9tbklbo;h

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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 voltavb zf4m/r k* rg.5:x,b tptwr(ge across an inductor is doubled, the inductive f* .,btbr4 m p:v(x/5 rgrwztkreactance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approacheslof1h a;3a)3,pcq 9aqzc-q-krf ac+i zero, the inductive reactance of that coh9 + )ca a3fic racp-,alk1o3qf;-qzqil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, thew;;ddh dww/46a (dyvd curreh(; d6ddwwdwyv ;d/a4nt

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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 ackikmkba:h4n e5 n*qe8a0 x,p) circuit changes by what factor when the frequency p0 k a8)nmh5ke xb4a*i, :kqneis 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 voltau 4i a cgn7gqe9. (tbc,jvfc(tp 6*p/rge across a capacitor approaches zero, the capacitive 4qug (gave6,(/t*b pnfcc9.j tc ipr7reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the vol+rpcj ;-lw :t(gz7c3 kon nx:qtages of the inductor and capacitor in a RLC slw (on:ctz;:k xqpr+- c73gnj eries 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 anjg u:xubcx3 ;/ RLC circuit 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 th3jr7 pu47qz9tx s ,jxks7tu .i3c0uene circuit increases if R increases. When is this sta0j t9qrsx3t.z7n ixue us7kp7j 4u3 c,tement 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 impedan8 layuug e(7+o5 sn *u;kww;buce 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 thvjw b:;,2 0c wvx-ze,7 skalvoe 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 circu*a8u( z)pvegztotw 09it, the v(* ze)t 8ag9zwoput0resonant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At res4 j c- ukg86cnn6qut.ponance,

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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 ci03*avqfke4icy .vf :o2nud3 trcuit 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 inx x(ad28kl/ hg a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic /d gx(k8ahx2lfield 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 field of 0fc jzm2qhr1( j,n+y 4l.20 T. Find the magneticy+hq,zf1 ( j cmjrl42n flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0uie0kh9tc h ().20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field)uctihk9 h(e0 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 adjustableybs;u*d u)./eudw .izvyj3o6o ( bp1j 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 coiloozq2p zni6c 5(:i/z nslvi:8 changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a tq2.o q4r+f pjsquare frame with sides 18 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 p2.to r+fqjq4 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 1dzk(kzs1n6 x:es3 +wwo ;;gjq5 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 adu4fx3 irr2wr :*5urx6a8 kao nd 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 m*+xni khv, ux6ntd+vy 1:h kz8 flies horizontally at a location where the dow8dkzt+i vyuxhn+kvhn1, x: *6nward 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 2.0 m long rotatz -ze6p3 q4e 7ylg9pkces at a constant angular velocity of 2.0 rad/s about a vertical axis through one of 64g kcep7-y 9qlpz 3zeits 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 loopsh 5pbegr,;fr1jf4 d; d *nei0d and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of areq7 q) hd0ye oylksa89*a $0.090 \; m^{2}$ 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. Eaz0* f2p7wupiq46f)s: mxvxt c /7ctkuch loop is 12 cm long and 8 cm wide. k67c / 4i x wtf2cu: 0x7)q*ptpuzvsmf The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage 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 fl;4bal) 2c-b- gjg-m -fmdubof 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 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 cd (7n:r)m +rg8p hudtt.x1atwith an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the +1pt dn)tr.gm(c :dtuh7 x 8arrotating 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 maxi(4msmhyuz1 8mmum $emf$ 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 haveao3 sx5n3: jp hux+ng5 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 reqz 1:x 2ql q-gzxpl1d, fk6n.wsistance of 6.00 W. The motor operates on 120 V AC, and:q, - x g1 1l2zwf.pdkqxlz6qn when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0w,9 yf+finl(x ob)e/i W is connected to a 24-V power supply. The operat fi9w +xifb yoe)n/l(,ing current is 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 67n1p *v2dm(o9m j vnnq.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. n n(d2o9m7*vnq1pvmjWhat 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 p,4 rmvrtzig-8ower supply. The operating current is 1.0 A at full speed. What is th,rgz 4i8tm -vre 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 prim0.-2o ryo egt 7aryjq- ez70bhary 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 ehl:jhx4eud) q x3 e5 8*l3.aacwrp+ uflow in the secondary. How ld cj*ue w5 ax8)hqu epa:xlre+.334h many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primaryq5dd 6vnc2o w5 uc 7l rh+b;/bntt-im1 if the 24-V secondarurq h62+;7-btdnnct 5 1/lo 5mvbi cdwy 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 n 9lpmt3fj2- iarwt g-8xx *9b i.i;cyprimary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in thtf8yxtmril-.9 gj2c ;pwa bi-in9* 3xe 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 transfo 4hqwe0dihc-i3k 0wh do01v)prmer. Assuming 100% efficiency, how many amps at 24 V can flow in th4chi)qv0ed0 h pdw3k h w0o1i-e 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 h/t; tvsff;rdz5k /d57500 V at 10.0 mA. The primary coil operates on 120 Vd5/k t 5drszh fvf;;t/. 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 turn1lgjfvz3hk++2 6 nzrms on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the26jhrz m lf1vg3k ++zn 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 hd cs9q- +,f5zkmqe 0sfas 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is9f fq esd5-kz0,c+ms q applied 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 t a.-ghhje r2xu3lk:7n urns and its secondary has 200 turns. If the input crn.3kgxa7-e:2hu l j hurrent at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 1b*7 rnrov n/9c00 turns and its secondary has 200 turns. If the input voltav/o9nc* 7bnr rge to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and dc)5 hdlyki(l :a0ix6its secondary has 200 turns. If the power input to the primary is 100 W, we can e ch5)ldiiyk 6 0:dlax(xpect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120x1, ivoxd 54cwdiv4+y V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1iyv45 wvxdo+c,x4d i1 .0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltag8 x7m):vqi82 isek xpte is usually stepped up to 4500 V by a transformer and transmitted through a pow2k:ip xex7qi mst8) v8er line of total 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 curre180xjlwl1 ky3v f k0oent 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 Wk1 0y 0ow8 v3kjlexf1l. 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 resistance of 0.ba2 vyoqr1o (s-kyx9-:* lefb60 W. A generator produces 100 Vao(*x2 -oerv:bf1yy sq -9 klb 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 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 resis-ni0o ;hkjlgix 4 ,bs,tance 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 ratigs 0 ;hjkb4, o-,xlinio 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 1000 V. How much le19 ;+,x ainlvtmwgm-jss power would be lost if the power were transmitted at 3000 V inswl 1tnxm g-9;mv a,ji+tead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be trans.,pa)ll 8vgk emitted on a line with rev).pe l,8kl agsistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of ,69vgk mx+oo68k otl p5.0 A. How much energy is stored in the coil's magne, tov8x6k+9km6o og pltic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W mpz1 wo9 9ha*iresistor and an 18-H inductor. What is this circuit's tii*hm99pow1a z me 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 wh tvy-zgz. ( 8cgess/2aere 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-V AC outletjm esl*d 8j z 5o1sepo6e;lawcppop(2j *+/s 2. 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 inttr i)yn*v9p32pzo *z;bmlk /h o a 120-V AC outlet. What is the resistance of the lamp? t23pzikln*pv9 ;zrhoy b)/m*

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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 2wt/ +b6cs(-niihcq vac power supply. What is the peak current through b62-(sw cc/h+ vtiqn ithe 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 pow2el j ,(qg9vttp4a1t jer supply. What is the power dissip9 ttj1t alpjg ,4ev(2qated 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 res iem2 m;;xlvfw.r ht(/istor 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 resistoqu4f :dmhsnf+ i04xxl5;y/a vr 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 is . og d.xepzsut4bm74:/vwace0 m s /a1$I = 0.80 \sin (240 t)$. 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 reactanc+uzyn:/m n -2i7na:qlxz. b aze of 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. 7c z;y*k)k7k-b tqiiy50-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 ti9 a;5o-v78ii8s kju0n:lo v/ad grwcoil have 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 157 W of inductive reactance a1 cjk pk)bbx, qo)0r5vt 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 whenrn(9ews vr6 s* 120 V AC at a frequency of 20 kHz is applvr6esswr n (*9ied 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 2.50bovnyom2 i daw3j:++7 a5zv)w-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 reacg//ea:ahw d/ t*7p wuwtance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at 10 d.3b,;mrxoz 1izwb4 nkHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 1200 Wbks 8-t oh0 y:ohly5an 2u9::b zijb(y?

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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 reacta *yv+j+*g v)puqzzo(0ppx / iunce of a 0.010-mF capacitor be 100 W z opjg)uv(/zp*+pxvui* q+0y?

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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 capacioliit v,175 :vh4ey);opd jwctor 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 4iafzl/c bpbc; */b .tum1pq;an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacmpz*a b/u1tf;.b;4 ccq ibpl/itive 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 coil(**ox1j6 9pznzr dxil, and 1.0-mF c1 rzl n*j9i6(p o*xzdxapacitor 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 siaa9 xk*s93f at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are c* 993fs saaxikonnected 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 inducto ep 28;lp5 dxz uwlz-, sev1yv:08n8qx g,veabr, what is the impedancl,by:aw upsp-;l,5ve2 e8g8x 0vn xdvz1z8qee 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 os91n/s k3zi zinductor, what is the phase angle at 1i 3s9/znzks1o 000 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-m4v s0i4-acae qH coil and 1.0-mF capacitor for a total impedance of 100 W ata4 4-eaqcvi0 s 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 capacitancespu2 +tj0uab x1 is needed in series with a 100-W resistor and 1t p 0au2j1+bux5-mH coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must o wa9kym(1/gebe put in series with a 450-mH inductor at 5000 Hz for a total impedance of 40 ewom g/a(91yk000 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-MHz fk4*qw ckf7;i for a total i ffk *qk7wc4i;mpedance 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 265 /vs8ram b ;dctqf6h0-mF capacitor. What is the impedance at sa/5f qc6btvdmh6 ;8r1000 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 1.0 ktjaae:at(x1 qp7x 00qHz for a total impeda (0e a7qaq0j:axxpt t1nce 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 n , wt3hhvq+y7in series with a 10-mF capacitor at 1.0 kHz for a phase anglyhtwn +qhv,3 7e 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 rey4l l ;:om/au,vliw (esistor at 1.0 kHz for a total impeda(l vielm,4o: wu; lya/nce of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at *;/ jhvs ky8xw120 Hz. What is the phase angl;ws/jx8yvh * ke?

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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 1500m8lf/e ta1odt):mw+pi w,r( c Hz if a 100-W resistor, 20-mH coil, and 1.0-mFwt/rcl o8)tm +mia w,d:1pef( capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, and a 0.v+(9 nf ue-s,yxvg;et350-H inductor.tfv9 e-xyuvs+( ,g;e n 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,atox -4*g vpl/ a capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current f al4/-ogt*vxplows 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 fo l+dl3,:fwkzlh gs/iv yf(o 6oh45 uc(r a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and isy,vo fh fgl6 4u:hlc3o(l /z+dw(5k a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase an1mahmuu;on: 6lx5jxw:*d a3 j gle of:*jo:;5mmwh a ua1 x6dx ju3nl $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. yi:a)kg*,* yy irci1v At what frequency should the circuit be driven in order to have m,a*i:)yyc1 v k*iy irgaximum 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 resistanceav1n8fk sj k3;pdp/1)k;l dry, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 1kpn/d 3k;la );r1y 8v1sdjkpf20-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 Act(g5 ejx)feq gq3- ;xC 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 of 60z: hg zxp.v9,s W and a resistance of 30 W. What is the power :h,z9x s p.gzvfactor?

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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 contaib7k gc,1p3fi3u 1wd7 cd*befpning a 50-W resistor, a 10-mF capacitog*u7dcd f,1f1b3ibw k3p e7cpr, 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 1abnm8takvoo d08s0-:9m7 j t r.0-mF capacitor and a 15-mH coil in series?d 8 jatr09 7v0koa8mb:nmo-s t

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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 1xh ct-eg/p6n.7-mF capacitor for a resonant frequency of 10 k/ phxg1en t-6cHz?

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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 an i7ypci8 :cav7zowgmso8 (,6 resonant frequencvo(s yn moz:c78,i8wpag 6c7iy 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 serieshrhc f,srdbh9 7 ,9xdxe0*o8m with a 30-W resistor and a 40-mH coil if the rehdm*rdb r ,7 89he hcos0xfx,9sonant frequency of the circuit is to be 1000 Hz?

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