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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: 游客未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnet6l os-et6h,fp ic 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 i/ubltpjr5n b8t 4-l(that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kin;ty,h nf+ dh;d ml4o5yd of change on the indulmt+;,ho yf5ndyd; h4ced $emf$, 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 loo y-o9u d);,1zpyxfsp kky. mh ,-wz(ggp of wire produces what kind of change on the d1p9;gwzg,u-kyf -x()zm hy., sp oky 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 oowh4b;kru :ao/+b dq 4f a loop of wire produces what kind of change on the induced4;:r+ 4ohdb kqbwuao/ $emf$, 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 removedg7)fi0ggf ) vg.s8w: bmd h0qo from 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, tb ik0z:j.w9p d);sj u*r c9qvihe direction of an induced current in a conductor will be that which tends to produce which of the following ei.9vpuq;iw:s)zdj c0 *9r bjkffects?

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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 kfj-t/u1a4 bea horizontal table. A bar magnet is held above its center with its4ej k-/ aubtf1 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 horizontal table. A bar magnet is :t)q dinc:h.xheld above its center with i :i:)qx chdt.nts north 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 vectoripm8 4bvm23cl3tvee4 points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sensevi42vmte3epbm3 8l 4c 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 where the magnetic field vetgx ((e 64bywictor 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 ty(4xb (6iwg efield increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnetic fi63)kq cfav:oou9v;qkh )crl 0 eld points straight down. The magnetic field disappears suddenly. When viewed from aboq6 c ;kq fvorh)u0vc :l3koa)9ve, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal tao v:maan(z sy .h-yx n8q8zm4/ble 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 abovq4z88amay h(. vyx/m:n- nozs e, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire wit4 3wr 5s/d pcq;6uut4ky9 capkh the north pole entering first. As the north pole enters the wire, the induced current will be (as viwu54s6upt;/3kq yca d9k4 p crewed 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 an axis 1zwv1 b2bt8d m19sqngef u3s3whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axi3s9 13v fzm2 1 snwqdue8gbbt1s 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 ba*fpyq /1w x44s)k 8bi3dreojlf3a ) at constant angular speed about an axis whose direction can be varied. In a region wherewxs)fj fba e 4q)/k48ylob3r 3dpi*a1 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 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.f()f/vi5h.6hv y dng m
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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 thbf i lt6+p) /okmc9ngsjo7.v8at 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. The-t5nlez b9v 65 ;dfzda $emf$ 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) is moved northwarny i9 +g)-wqdkd at constant velocity through a magnetic field that pointw-y)d+ n k9qigs 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 constant angularhtq(7cl q38r3l, c:a/: au+ziw.zs 2 ddlsofu 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 transformsq7j/..rp urns

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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 revoo5/ 1qep-zcd.dpnu m8 jx 1cx1lutions each second. The frequency of the p. djmo5 p/1ez8-cxn1duxc1 q$emf$ 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 l3z;o 7z zre l8n :pc7ef.m;lwused 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 p0 phlhcdg:vu,, g4w,m:wu * gthat

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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 s* oru 5p sr+2n8*ldyonecondary coil contains more loops than the primary coil then it s*y 2+8u5 *opodlrnrn is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains f)8pblb3 .x-qihn i9qfy z (-wmore loops than the secondary coil then it lyifw(p9q.x3- nhf8b-z)b qi 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 pfwgh ,h9qnw 1-r+jn3p ower 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 -/ 1yfcl:dl:cu46uo gw t iwv0circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery olr 9qekj82v7r6+x otsf constant trq68kvl7 osx et2 r+j9erminal voltage. At the moment 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 connected in serie0 pz;cp:dbzv.ncg x, ,s to an ideal battery of constant terminal voltage. At the mobc n.;zz p:dcxgv,p 0,ment 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 resistann7mn: 3s0ym+xssii3d cw(qzscl:7 (fce 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 inductan3iv zfgkptle8 ..-sy /ce 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 connected in series to a battery. The time15 :p 9 yun(kmlypen vmsmxn5fh.2f9 / constant for t1nm( 99mnlp2 pk5nm/f uy ex y:hvfs.5he 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 inductik3asto.cca0yz (c oa6a+5 i.or are connected in series to a battery. The battery is suddenly remoz .( i5acyk36.+acatoc0isa oved 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 the same unbogoqk /l-x)+z 7 /ddvits 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 cf mu-sv4m; ye0ircuit, 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 t*vpv.+p 4+6v agyste)u ab(gc o an AC power supply. In this circuit, the currengg6vs)p*va.+ty v(+ bapceu 4t

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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 t*ro.l)kt+,p3av fbaoqm 6 o8 fhe frequencao)fqtb6fr* 3 ovo m.akp+8l,y is 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 ac (uo mne26*ryeross an inductor is doubled, the inductive reactanceu r(e6*e 2onmy 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 inductok5)jh cp;8 faor approaches zero, the inductive reactapjakc) ;h85 ofnce 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 z0*4 fo,z ucnfcircuit, the currenz0fuz,f4no* c t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive react/n , o ,-djmd)d9szqqzukpnz i)e(q88ance in an ac circuit changes by what factor when the frequency is trip, zd8ds)e m8niqzkz o)q-u9dn / qp,(jled?

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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 zer1zayp+x 2lt*t o, the capacitive reactance of tlaytz21x+ * tphat 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-+.sus8ctposl iabv. r u13szj ,;+ren a RLC series cir3u.s+l. t- sj+ s z;us bra1vceri8p,ocuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined a-tkn6ucmwpr /l1zt7 p2 4v:wis $\cos M = R/Z$, 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 thcq:m4j zb.7x eo.453bbb ax8l-j dpm he circuit increases if R increases. When ij84 hb7:c-oxm534b bm.bx dle jq. pazs 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 increases if (o g4ds-h;rpsi53 ifh$X_L$ 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 l gqn)r 3p(t(nimpedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and2p ehg*wn;ci/e tc+jdz+v(g 9 the capacitance both double in an LRC series circuit, the resonantgi h *(wen/jd ;p+ezg9+t2cc v 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 applie:s fskf(i l57boq kn,6d 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 circui7mfy37z+ bam bwiu dq.t- i10st 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 i5z 4y*e+esr(7 fuoetp n a uniform magnetic field of 0.20 T. Find the magnetic flux through t o54zytepsru(e+e f7* he 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 w0fptd9vg p8vv )0fl;m 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 fi fg )0dt8fvwv;pvp09 leld 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 roc0:fh hlx r:s8 6yrvr*tating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop wh *8 :hrr0:cy lr6hxsvfen the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is redu55ww.ybhn -xhkb :.f aced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes fr m1gi,weix80t om $4.0 \times 10^{-5} \; Wb$ 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 18t)z*j 4iikemhz 9q,c1 cm. A uniform magnetic field ,z*4)e i1i z9jkcqthmis applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire d6obh fsr9 hfq8,ow)5 with 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and jd/ir4ijs1 d+ 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 wing52u 2n,yhko /jbvh.am span of 60 m flies horizontally at a location where the downwar/vkumh.jh yba on5, 22d 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 lonrij;.b.ry*(z vkq nkrjvbl 7i sq3(0)g rotates at a constant angular velocity oy(.qvbrlj kv(* 7ii.rs3rqkjn b)z; 0f 2.0 rad/s about a vertical axis through 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 a cross-secwlhv p,t vg3+nh5g )v5yx71outional 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 okb-x-es52 hd..z 5ved;mb dbn f 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 rectangular9r qc445r4pac g *8t(cvj3qzadg d ljjn d.+n+ loops on its armature. Each loop is 12 cm long and 8 rdda4cgdj*ql4tr3.acjn 4(5c+q+8gjpz9 v n cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 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 of 9b b;mmkoya1pjfb, +t)xo 2t8area $0.090 \; m^{2}$ 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 simplu2/: fffq)whfngt.; qe AC generator with 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 rotating coiqt2wfgff/: q. u;h nf)l 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 aj .*sgu-7e4 ;b zlusac8gjzbx. 8*o wx maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of nf(0)oj x3vnsebfq7 5a+- v ra(6wyag 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 motor opevybr 7zvpl9 v/ydcv847h(j,u rates on 120 V AC, and when running at full sb z97vc48 p/vvjy(h 7l ud,vyrpeed 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 pow u7h( 6*yyxgijer supply. The operating current is 1.0 A. What is the*gjhi7yxu 6(y 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)k3pd y2 -1sxeoqj j9g-yz e1a a 24-V power supply. The operating curr)dsyq e13jz19kxa pj-gy- 2oeent is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power ez+4 ec *ewe83jjkp*m supply. The operating current is 1.0 A at full speed. What is the backkj4zeeejcm+ p8**3ew $emf$ 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 primary vol3pjp9x 1c uqm2t7 2fsdtage 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 ca8*9mig 8 uzospuses 14 A to flow in the secondary. How mani8*8sop ugz 9my 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 arezq.gya.: v;f i necessary in a 110-V primary if the 24-V secondary h;zf i.v.qgya: as 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 au -js-1tl2q.;3(wsaijypi5 4ncj iih nd a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current i ltwijcu2sai-5ji ;4 jy. n13ph(q-i sn 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 prinb1una ,x.nn(5uo1iw mary of a transformer. Assuming 100% efficiency, how many amps at u ( n.5 bnxu,nwn11iao24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 s-6fygfx*. ep V at 10.0 mA. The primary cox6 .*psg fy-efil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns o99cbyzfat km1. 1li i*n its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage i.9ita9zikbfc*1l1 mys 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 8;) mf/g 0x4ys bacqalhas 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applib agxc48) 0ays qlm;/fed 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 transfjigp(w 8xm(h /ormer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we cani m g(jxp(w/h8 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 transforl6dsf -hub,ixa7,j * 9uqdo b5mer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the 7s d9uxo5hiq-ubbl,*6,fad jsecondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary hyot ri;5p 2fgdz/t;k(as 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictip f;o5giy2/tdk; z tr(onal 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 Vort,pauzk;-pl /j 3-iz7x* cc . The voltage is usually stepped up to 4500 V bo z;z/ c*3 prjp-ulix7-tc,kay a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually * vf)c-lz5y0 o qdyoe,stepped up to 4500 V by a transformer and transmitted through a power line of total) c oy*qylo5 edz-,0fv 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 cu4aub,(gn ceq( /vcbm*rrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and tra4ne/cb, (b(mgvc*q uansmitted 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 resisahad;)tz3 a +( iwa .z6jvsz3ttance 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 tra a 3 htjivwzt)+;3zdaaa6(.zs nsformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A gehn9-ks sgu+ +xvcuj;7nerator 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 transform hu7- 9;+nxssjkgu+v cer 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-*mfjq ccgm./i prp)c4f 3pu2-W line at 1000 V. How much less power would be lost q fjf uc rp-p.c2g*pm/)mi3c4 if the 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 to byvcgo 4b+z3+dqql .mwajq 0,bj9 ma- (e transmitted on a line with resistance of 0.60 W. To what voltage must the generator outpuqjzj-ma0w4d .g9o lb ,bqa m+vyc(3q+t be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored1.3agw. ds*me(d (cxmhtogr8 in the coil's magnetic dg.r e8omh 3g*((wma.dtxcs1field?

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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 aun m tztoy( * cb;s0,e0d/ha+*e rhz8s 6.0-W resistor and an 18-H inductor. What is this circuon/z zhyht d;ma r*ssbc,(te0eu*0 8 +it'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 120 V1d7 yva k2f3 aszh)ynrd/hb +5?

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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 asez r posl 03ge nfn: x4c58dvu(e/18a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is5uppoxja 3q*y3(ggx54 h7z ru the resistance of the lamp?goxhrz4p3g ( ap5 j5yqu*ux37

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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. 2cmhim-0b ivv 2ik74wtsi7m0(: re :fxvi, rg What is the peak current through4hmk e:ibi 0v2fgsivw,xm7c(v: ir m2r 0t7i - 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 connet,;r.k ez8hj cv/kp2adkr k(-cted to a 120-V ac power supply. What is the power dissipated in tc- /8 vtr(jk;k .ha2kdzr,pekhe 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 resistor isi246bhiu / rjs $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resisto-ycplw zb2j (q8uu4 )pr 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 av+cgupqvz n 4x/;6lp/ 50-W resistor 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 j8qy zm) vk m9dla*5gt52qy5y.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 reactanchj xdpr3g+ 4mk 6i( cthj/o8:w2u2xcze of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reactanmt kf):/gal7ih(pr18 f6 ryuo m(eb.ace?

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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 inductej po-re0-.c;)zhsc tive 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 a frequency8 rhjei:y9bu ,hbpc 0z4 obfv-rt,mdz j s+538 of 20 kHz is appj+rc8,vi5 b -ph or,z:d498j tb0esfhy3umz blied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50 /c6fxwd 7fl1n1wgr5u -mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4k0+mn-okpd3 tj +pf8vc z1e1u .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 caoft j:cj333bh pacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of /ak*fq dv e*w++l)yav1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF c9 v 6wrm4+jgsyapacitor be 100 W?4jrw+ysm v 69g

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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 throu)8)bu) *zul 7b*w4/fjy p cdzwncoz*3ggnd 9 qgh a 0.0010-mF capacitor 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 1*xjrh 7, 7gsvv2.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitiv sxjgh7,rv*v7e 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 impt2m:q)z ;v -r0cz; d0uvjefua edance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-da2z:;qz0u;vtc v )e0fm r-jumF capacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF ce:9lpc z +g-;7cvppsl apacitor are connected in serizcpv;p: 9g7 cl+-pslees?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor:zyza ka8 -zwkczr:,; , what is the impedance at zwz,-:zaary k8zc:; k1000 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 seri2o0 z3d-4z8wkg;nam ;y omwaxes with a 20-mH inductor, what is the phase annw 2do0x 4wzym k;3agmza- o;8gle 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 serielsz( fu1c8e(r s circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 118s(zul(f r ec500 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 with a 100-W g 39j - gy1uyoc80iuetsx2-w xu*akg0resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hz?1 uwscio gj-*0-tag 9e0x 8yxy3g2kuu

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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-mH inductor at 50d7 h/4j rve rrg bt+1lg,r1lqv ai,6.f00 Hz for a total impeda 6l ,i11vl q+rh74ardgrfb,gjv .e/tr nce of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must bee0g 2nsed(4l*-rlc l pfq,0w z put in series with a 100-kW resistor at 1.0-MHz for a total cd glrq sfe40p2 w*0n(,e-z llimpedance 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 s3w,b*h0cm7 izhvxf) b/h hks( + ef2gderies with a 20-mF capacitor. What is the impedance at 1000 Hf(b chxmdw +ehz*3bh)f ,s2g07 h ki/vz?

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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 a9qd0ey7frs3at 1.0 kHz for a total imrd9 aeyf3q7s0 pedance 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 sei7a,x;pi kb( eries with a 10-mF capacitor at 1.0 kHz for a phase angle of 7 ebpixi(,k; a$40^{\circ}$?

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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 at 1.0 o 08r6dv(gegrkHz for a total impedancv 8 0r(dgg6eore 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 120ngr qd 5/kf3-j Hz. What is the phase an- j5/k3d rnfqggle?

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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 ln2:w)vt tm/eta c5txk,m7x 81500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor t x txtwlc)ktev25,/ma: 87nm 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,b0 qgeqv xg7;k0+y-eu and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supgx ek qy;+ uvb-gq70e0ply. 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 reactance 30 W, and an ind3ijt4w00)pfcu p+c2dxemd -la 0ux,huctor of inductive reactance 30 W are connected0 ld+cw3px f2-)4mtx,uphu ec0 i da0j 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 se)fr2uft x)1c9g o*ub rries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-1gu9 *tofrcfu b2x)r) 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 wp xya*u:g3:jlith a 500-W resistor for a phase angle ofa:gx:3plu* jy $40^{\circ}$ 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. At what frequency )oo.a1sig; j2gsd9t b should the circuit be driven in order to have maximum power trgsg2 oao;d1.its)9bjansferred 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 resiqiek3+ h3cek0qq)18ul - poa jstance, 15.0 W inductive reactance, and 10.0 W capacitive3q qi + h qea-k1lk0jo)cu8ep3 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 an17k0en zpnv)l AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of cj2ou iee3b92 60 W and a resistance of 30 W. What is thci jebe 3o22u9e power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit conta/v)l2ai +pgmjtm ;og,x26 n uvrk +5bnining a 50-W resistor, a 10-mF capab;vu )t+ig2n62,l+n kmoj 5/xrpv mgacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in sehh9+ cof*7csrg2v9x(. ( q qh(tngpcjries?pxj nhc fsc 9(v.gtg*( hq+7rqho29(c

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a e j9g4nat2xg .resonant freque9 g.xeagnt 42jncy 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 wd8d:xnb8;xw1j/ h9 d curyy (4bd(fdqith a 3.7-mH inductor for a resonant frequenby8 (ddf xb:chn1qr( x;j9uydddw4/8 cy 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-mH qtl7o;l3h 4og coil if the resonant freq43o;log 7l tqhuency of the circuit is to be 1000 Hz?

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