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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 ofu41 zbosiaijmog xv nrg7-(g)81 (h;c magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states ss2t4e *3p2bnq/i ea71nals lthat 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 ki:72qvpv4gy, bzp pi: qnd of change on the inypq zb2 4::,qg7vppvi duced $emf$, 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 magneticn)h- .ryg8 ehq field through a loop of wire produces what kind of change on the i q eyh-.8rh)ngnduced $emf$, 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//vbt;w k/ xkr what kind of change on the indu;v/rwxkktb // ced $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a maf;8 s)w ttzm)jgnetic 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 dire(* +nbgydoi z, ds5r79 viv*x4wqane4):a roa ction of an induced current in a conductor will be that which tends to produce whicno+,vbn(r)i vxyrwg azs oq7 de:a5**4 i4da 9h of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is 7*9z8 rgxins/m9-cxg qq 7rhqheld above its center with its nort-s7r /x8xzqghi99 m rnq*qgc7h 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 horizon5jkwo ro2updpt/ yzc)8/7n 3n tal table. A bar magnet is held above its center with its north pole pointing down, and r7y)5/uz8pt r3djo n c/wkp2no eleased. 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 v zybm-ra/ s )fl9 p(bgt *oa4)jt,nt*vos t.m;ector points straight up. The magnetic field vanishes suddenly. When view;z p*amo)tfs( ,-tamb4tsj tn lr)y. b/gv9o*ed 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 level table top in a region whe;z0nv5pzo ccvhd n3kb0/ l(94up9wgw re 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 increases?ln hzo0d w9vc0v ;9gckp/4nwu b(zp53

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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 regionx t) :m k*dzzfdb*a:)u, vq4io where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the d*)z::, xu*aok b) vmzi4dqftinduced 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 y3f q19lgymk;f ub)br3ge+(y and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circlyrug( 3lfeky+gm1 9 bf);3byqes

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the no kbqt5kqtb 5 ded +)gy*qd.9(rrth pole entering first. As the north pole enters the wire, the induce+t5t. kekqqyd dq*9 )r5(bbgdd 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 angular speed about a28 qk x7*s+1gfseigunn axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induc+i x7ssf eg u*g1qn2k8ed $emf$ 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 aboutrhcs.4 aek 9v( 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 rotatio9 r(ehk4s.vcan 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.k h7 0e-wr*e nq3wgwh: m; ,i.fj2zibw
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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 that angmp0 yzg z) .h*;q;gnl $emf$ 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 rk-dk4vgpl5 7 b24 ptmfield. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction)o( og82pesb(j is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the pogs8 j(bep2o( otential 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 conbjqpv2 ,x-b+u stant 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 trans4np)3 8t hi nw;vpb+pfforms

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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 througdl rgsr.e( y;8h 60 revolutions each second. The frequency of the lde;ry g(r8s. $emf$ 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 g8octwto f 98g57lep6k3e 8 9fjdpy(dto

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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 devicmhg e:5 +/2fpxuwsr-o e 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 secondary coil contai ya/ wgp/g/*etcqhl, )ns more loops than the primary coil then / qy t,)*/ wge/aphglcit is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if thr6l(6rtelo* n4;y mg3p.s mqhe primary coil contains more loops than the secondary coil then oqgt4neyrm .prl6l; s3( 6hm*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 power :n u4w3j1 v. o83:c*csmxyun.ulxt rwt6z1zpinput

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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 c qncgr0h 1i75kzng 0y4/3gnb,

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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 .wtpivb4;fa .bp *w*a f upp3rl0:b2uvx7i)c to an ideal battery of constant terminal voltage. At the moment contact is mapu4 bw.vafp* 72 c:rt)l3fuw.ba p ib*0xpvi;de with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of cons)ac hhrj.*tvid0 0t:rtant terminal voltage. At the moment contact is made with the battery, the voltage across the inductor 0dvtriah t0*h :) r.cjis

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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 induct:yurvjzdv * **ance 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 i/2jv5+rcy9s1 oznofg nc5, x ;tem 0tan $emf$. 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. Themyaap3*eh:ea 1 sd / r-5 e5yrk4eu)qhz ck:2j time constant for tjheau*3y2p) z q h51eeak5smry:-k a/:edc 4rhe 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 a bed2i- uwi;3.sybns1sattery. The battery is suddenly removed iy12w3e ns .ui;ss-bdfrom 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 the same units 6 ew sk0egd k)mgpy h9*i4m,+1 w) d,uwpyil4hexcept:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connec+zsu:7l r*2 gxp8v dqtted to an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the cupyq f4:znh 1djw -)))v q:l) 1yxcmkucrrenu j1)q ch mnyd1v):x)kl :4qwpy-) zcft

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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 whe -pry0jkb+3ep ju,d4c/nwe -j 85s xtin the frequency is trindwepx0 8ct je/3j sky,ibpj4u --+r5pled?

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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 voltn(0o 6n8ztdhxg4 -oygie11 byage across an inductor is doubled, the inductive reactance 6od -0n xb1y 1ggtznh84yeo( iof 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 anixx9jyip, +-e: nl4di inductor approaches zero, the inductive iyepd in4+j-i 9lx,:xreactance 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 this circuit, the curre) l 8pxsryjvrmt;b,5 c 8qs8k*ntjkm bl x 88*pc)rt5ryv8s,sq ;

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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 vgao*p /sd4kxg)n)mj uc3n1* factor when the frequednxc*a/k3p sn) mjo) 1g*4vgu ncy 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 approaches z whfk*lo9 g19+lsgjel:82xs fero, the capaciti xf1 gh8+lsew:9s9gkl j*o2f lve reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor i/jc8rcn*p ,t en a RLC series circ*/ ,ecnpt jc8ruit?

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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 Rkuxzz jwgv 0xx6;e67 8LC 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 the circuit increases if R inn386,i9f e9xbvzl simcreases. When is9ev nxzs396 l,8ibimf 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 impedance of the circuit increawisp3n c2n8yzv+d5 (f ses 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 jk0on 0o /xj5rcircuit 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 da j z+vzpy. zvc7ui j-c/-8z;capacitance both double in an LRC series circuit, the resonant frequency of jzc.;y8id-c 7az-zjzuv/+pv 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 app ) xl9j(edx,lh*i2 4zweqssv2lied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs va)fd+3fopgb:, d0t kwhen

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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 rotld0xau .r3e z*ating 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 v 30u.erz*xdalector 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 0.1u p7q,3j,gk0n fx zn9x0 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic fln xz39,f,kgu0q n7 jpxux 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 901 ajqwwple)is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vectore91 0pl)w jwaq are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single y *ga7fg2laq51 t9ewymy 7o.sloop 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 cpwwvr .x xfh. g uqph(4.3r*(boil changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 15p)au46*kp cuk aji2ytz6+p x8 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from z65ipp*2 a4kaj 6+uu xcpykt)0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with(sb y.ej+ 3.ekii3 fiz 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 a0 8;ru*hy2km-je k kmxdguf33nd 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 flies horizontally at a locationop- g) * /mgypnzzi)z2 where the downward componentg/n-*)gmpzz2y po i)z 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 rotates at a constant angulayep6*ig2s ihuge 8(v, r velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fie p*gi8(2ehy6s gieuv,ld 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 w9 .ga7oz k9mddaef(* has 50 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 turqn+s b1) h(0:i0*jhr lwygysu mkr7m.ns 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 arma;rde4q6znp7s70 rze ature. Each loop is 12 cm long and 8 cm wide. 7a 0rse;q6 nzp47re dzThe 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 of 100 turns of wir29 -sk5cpqbr3z dmz jv71ya9myz-ym.e 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 vb h/sqpm t6tr4oe(r2cnq75 5 with an output of 12 V maximum when rotated at 6q6q 75erh2/v ttcn(bm p5o4sr0 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 generatorbmi qt):2+uknf 4,wl z with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance spp-gh3bf*bw 8;0wkef1w8w2io2 nr b9 e)don 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 DC0y viea 9t2;r.vbmlk2 motor have a resistance of 6.00 W. The motor operates on 120 V AC, andi;r k9ev mly a.2v2tb0 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 6.0 W is connected to a 24-V power supply,jty6 1giw 9qz. The operating current is 1.0 A. What is the star1wgtj6zi y q,9t-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 poww2s h qva6*a/ier supply. The operating current is 1.0 A at full speed. What is th aqs6/2ha v*wie 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 po+fjq4 6t ydeq7wer supply. The opera jytde7q 64+qfting current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reducemnk 5wc -.a73(z kv8 i;p kwtcfctmva2slh 1;9 a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A t 7 bidtqbd jw61b*mx*e, );nuro flow in the secondary. How many turns are x)dne *dbj6r; bbqw *, t1u7imin 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 primary if the 2*w x1zqly8+ qo4-V secondary h*zqywo1 x8 l+qas 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 primary coil d*k+(z 4mlrm land a 2000-turn secondary coil. If+r(kmdll * 4zm the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows i e4mxe6buq) e2;;yyqen the primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secobux 4yyeeq;e ;em2 q6)ndary?

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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 1 wnv4i33m2dmwd g6yoat 10.0 mA. The primary coil operates on 120 V. What does the 3gi3vwdn 1oymd 4mw62 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 turns on its secyq*vxldm.0x q 6ly5 zc:v3dn2ondary coil. If 120 V at 2.0 A is applied to the primary, what voltage iq*n.ydqlz2cx65 : dlxv0 vym3s 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 yg 16zlcywi(.9a l ty;secondary coil. If 120 V at 2.l1.ygay lyc6;( itw9 z0 A is 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 turns and its seconda fhhqa1ju/pu.im ; 6i-xu); egry has 200 turns. If the input current at the primary is 100 A, we can expect fu1 6;e;u i- aqp.hijm)ux/hgthe output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. Iysl9kp4f vsmo 82wm :al7i vd6 62a3ehf the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to isl p m ve662ow7yvs 4hldf:a29a8mk3be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turnsatn/) omc-z j 8g+qo1x. If the power inputt axo/-8)moqg+nc j1z to the primary is 100 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 60 A of current at 120 V. The vol rec xhyu-:d1k 4z. 3lfeq6m.dtage 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 secondary if thuc x4qdr1..6h3- :yfdzmee kle 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 usuall*e hn,4gryms.y stepped up to 4500 V by a transformer and transm., mrghseyn4*itted through a power 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 current at 120 V. ivj6 6z, bzmcx1mbqm0(+6ew p The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power linmzbz pe0wmx 6b,j 6(ivmq+c61e 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 resistance of 0.60 W. A geyu .+9 l3wzycz(ogwa)w-rrn- nerator 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 transfor9ry y)zl wgww (. +o-cn-3urzamer 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 resii)b alhj8hz1bm69d;w5nn ms ;kr)w 8vstance 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 is lost when the transformer is u;kwrszi mn9 n)hlbmw1h 685);jdbv8ased?

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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 az40v. 7rqucov9*o gqqc*9goq t 1000 V. How much less power would be lost if 9qvc7qo 4oqvg *9uo qzr.0*g cthe power were 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. It is t**,f at8o shtkpbo 9-eo 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 *9o b,o*k-8tfapehts 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 enycz79x. wdo*k(ox +ifergy is stored in the coil's magnetic fieldxc9 zyxwf(. i*o+7kod?

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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 co 0ha55m3 fna;,ewf bfbntains a 6.0-W resistor and an 18-H inductor. What is this circuit's ti5heafn;bm ,bf5 f 3wa0me 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 theo) b94fag wp1g klsaz ,(b:+ro 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 outlet. What is the peak currvm6 zuktxucll-jbz)*6 /ln9 : ent?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is kf o 2dw:pp7f;the resistance of the lamp?pwdfk2op f;:7

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peak 60/oi3awjvil eopq:3 current through the resistv/ao630li ew oj:piq3 or?

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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 ci fe1c9y8dy cy-n5 ck6onnected to a 120-V ac power supply. What is the power dissip169yfcdcy e8k iy5 nc-ated 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-Wfrbda)t i4 -r,zxt nj7 0u+1df 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 resuvsw6aqwxko1ln7.e h8j ::x 1istor 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 vkl,4c,tat 7a$I = 0.80 \sin (240 t)$. 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-c2mjxup22 ,5fs4be jznw a ,/r+fkk :jmH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH v40rxdqpa +/ti,i,sg 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 col-py2x: 4; uzzp5 fzmw 7fm;woil 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 reagmnt e. 0x59w+ tvn/htctance 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-qdvr0d-g i*z )0cr2c rmH inductor when 120 V AC at a frequency of 20 kHz is applied to)q*rcr2rivdd0 z- g c0 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 dbb; *f.el)z opue to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF cth4 7 tyqccn nwk.v25-bq )3tu/+ kirxapacitor 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 reactancilu:boc (, kl6vuwl00 e at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reacsn2 /hu zk9 vi-or0 nm23,ffqbp; w2yptance 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 react,e -9ulkz n(qsance of a 0.010-mF capacitor be 100 W ns(9qk zel,-u?

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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 cl .6wno6c25ifhsnu iq;w a 0e:apacitor 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 b w,.f0, 5zzjqiyc(fkW resistance, 15.0 W inductive reactance, and 10.0 W capacitiwjz byqi.,zk 0f5c f(,ve 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 impedg*8d/mfiufg;-xqk yd,a3v k ; 0ln (3.wejipa ance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriea-jy8w.;3e l 3nx *add( ip0gu/;fmqvig k k,fs?

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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-mff ) 7xfjzrqa s9bjn g--/o2d0H coil, and 1.0-mF capacitor are connected inf7dn-/j9fr 2x -0aoqg)zjf bs 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 sw9r, jdb*)h *d:ydah 4d7hfz-ncl- c3/pqage eries with a 20-mH inductor, what is the impedance dcn rly3ec *-dhh/7*a dfz9ahdg,q:wjbp -)4 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 wit2gjlf+ k -b4skfved8+(d2hha h a 20-mH inductor, what is the ph2e b k- (g2ff dvjls++hdha84kase angle 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 with a 20ggn0o ca w+0 t;d9u,0p)up h+s ziaygaek. 1:a-mH coil and 1.0-mF capacitor for a total impedancynap;1ziu0 e0 0aoh)gw,a+p : d9a cggus+.tk e 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 wp ut;k3 uk ljk/r1f, td3l4.wsith a 100-W resistor and 15;kul1ptw lf/3j .u,k3k dt 4rs-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 be id:eiyklx4r , d59qiv;* 5g ewput in series with a 450-mH inductor at 5000 Hz for a total impedance o* iydwq; vl, e95er45g dxki:if 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-ss5 fn7c/ icn9zzn ;kgl2-yy2MHz for a total impedanc-ylyzsg;n fs2c5cn zk 279/n ie 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 se j 6o1tx/8ufxzries with a 20-mF capacitor. What is the impedan/6xxot zfju81ce at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series withy uq2:d4 u) ki50rjooq a 10-mF capacitor at 1.0 kHz for a total impedancy ku q)o5 0:2oirujd4qe of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a 0ew*o f(haau7um1 /mzphase anglemow fm70ha z*u1u/e a( 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 w2v; ajhy 6ejfu(8xh)j hh, ;yxith a 30-W resistor at 1.0 kHz for a total impedehh;6xx; yvfh h j)u ajj2(8y,ance 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 cp: *e1qj8/esxb ,mvoqapacitor at 120 Hz. What is the phaem1j ,v*qx:op/ qbse 8se angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and ygvq.lolv42*1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capaco vg*yl4q2 v.litor 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 cops;6kj c0lvlf wdq*8:nsists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. Whajqdl68 l0 ;f*:p ksvwct 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 capacit wn5lip w+: 9* qp(j4rnvgewt)ive reactance 30 W, and an inductor of inductive reactance 30 W are connected :e*wq( 5i 9pnjgwv)pn4l t+rwin 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 ;bt5q92s l. cjf 2jyw am:/tqyfor a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H induct2jj y a5s;b/t2w.y t: fqqm9clor, 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 apprxt 5zs8 0x6 j9x5+xzz2 reh phase angle osz + 09reztp5 xj6p 52xzr8xxhf $40^{\circ}$ 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 = 21 a:3ln.tkeuvn yp/iv3rgy vht46.- fu4v4e m00-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power v r6tnu ueh.ya/vm3iyv -ntvf 4e.:3k1p4g4l 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 out .ui 96jf*jbzjput in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, bzui*jjfj.69 and 10.0 W capacitive 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 zfs1 4orxo; (tis $63^{\circ}$. 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 tfd)7+/ f jy6s1:gj u2sd)nh.srw mnz3*m oxaof 60 W and a resistance of 30 W. What is the power fact3d:xo wgsmfsz) 7+jr/sj*t n1my6 .auf2ndh)or?

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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 seri.x ly43jtzhu1sp 3b2yes RLC circuit containing a 50-W resistor, a 10-mF capacitor, a1sxyth 33yub2 .4z ljpnd 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 coil in seriess5;n m4tahv0 p?tns0v4;m h5a p

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capac) ptn ne6vo57 ,w8 oo8h/qjojuitor for a resonant frequencoe) 8,n6 8ovjw7o tnh/q5oujpy 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. x9co5ahzf3qkqw:;/e* t ce-u 7-mH inductor for a resonant frequency 5hu:x-9 kf;qoc*wecza q/ te3 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 r/c8/z nej 5izi gru24s wzk01b,a+xxmesistor and a 40-mH coil if the resonant freque b1u szz4nzi/,jcxx25+g i a0k w/8mrency of the circuit is to be 1000 Hz?

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