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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 u io2-7orx w1mgnits of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that ku)kbeg5ny7 : k)sxv(aq f7 .tthe $emf$ 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 9uto z;lx )24buds7mk+kg onr(n yx;/change on the induonoz l)r ut kbgdu7;9nxy/( msk2 x;+4ced $emf$, 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 l /+fdasmeb8(.ilen: through a loop of wire produces what kind of changels faednbi/ e+m8(l.: on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces wfiinb 2-di v3v00+c6bkc eiv2hat kind of change on the induc0d0i+ki-2 3vieincv6v f bc b2ed $emf$, 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 mag4e lbnn)tldrmsn;++:tg :o4 lnetic 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, th+sxnz o/c(4v3y *rekp3g lsyj((w 3kee direction of an induced current in a conductor will be that which tends to produce which of th pkyrs 3wje(lkc/4syx((gz e+*33on v e 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. qk5a+p 4hufxei0p dpo) 9. t*2vwmo4dA bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewe fe)5p9d04avpd4pho2.t uk*w qm+ oixd 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 fu(t-, rn p tt/2x4ogqtlat on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet indt pu-/or,xn(g4qt 2ttuces (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 vector p0nf3v 8,u6 cgsnad )eqoints straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sauqn edfs60, gn8cv3 )ense 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 fiu* ( kjfawby1:eld vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, u*fka(y: j b1wwhat 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 horizontal table top in a region w0a+ v o5msyk6ghere the magnetic field points straight down. The 5 o+ya0mgv6skmagnetic field disappears suddenly. When viewed from above, 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 table and carq oh5.d4ubawd2u * 6kuries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from 2u5ud kd.b oq4auw6*habove, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the v2ejggb73qec s jgjj4z8 ev05p) j1)i north pole entering first. As the north pole enters the wire, the induced current will be (as vie5 0g2g 1gj7zp8 3ji)jebve4j)cesqjv wed 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 angkhbnzx(i ;b4/ ular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation ifxih4/ zbb n(k; the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular sp qic,aju)h3w7 eed about 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'iw q ha73,juc)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.t6 z0ddn.8rvj 7d1je l
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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 tn ;emdp/b0et311nvnn hat 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 filzi0c+xx*(,hn(nbp ff-w ; f jeld. 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 directionp* hmk. n2umi,) is moved northward at constant velocity through a magnetic field that points straighh 2 uim.np,mk*t 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 rota+ m+0jv--2 rf agdzkyz* 2wn27hppse ntes at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator tran(,q+ qw ws( 66l fpypaw1fpl,csforms

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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 tpdmwaa5y t,l7c9 gc /.hrough 60 revolutions each second. The frequency of thecyd t97 ,. mlcgapa/5w $emf$ 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 uxqhouu 8n*q d;9ex/,6w / qowysed 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 devsq kxyc7.a xb*w-96amice 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 n(8 cfwvqifuv b a9c1p 53f(h4contains more loops than the primary coil then it i hnavc18(4u 3w5fc qbipfv9f( s 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 coig zz5 4+ox(brdl then it r(zzg b54 dxo+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 pow7p, 1zg2g 3h k4ifnk:tlxr mt(er 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 cig bb4jkt8rt o-89;k pyrcuit,

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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 connecte).mxb)jyh8izi 40o7lm p vrwrdl 2o-+ d in series to an ideal battery of constant terminal voltage. At the moment contact is made with the batteryb)mjd0mi4io )vp2x8+ - rwlr .ohy7lz, 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 tov9og 1*qpv kmhov*9 *qm p5ew4 an ideal battery of constant terminal voltage. A9p4vmme*gqhpv95*woo*q 1 vkt the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resista9 ejj48xh *tcbnce 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 gw. mb9n+ -s b:4vgdfyinductance 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 ba7j+xn/mml/ vattery. The time constant for the circuit representsajl//n v7mmx+ 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 batterns)7e02yjjbb :w- f ebvsj5 5hy. The battery is sbs:y5eb5fj7ws)nhbe-v 02jj uddenly removed 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 ug: xml1qs +vv3nits 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. O)l /rnru6 )lz 8,. rhza;lkytwn 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 4goduv kl5x ak .pcte(u/2;(ycurrent5ueol4ukcgt x2kyv; d(a (/.p

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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 whe8 rc4(yvj nbtc- u/b+rn the frequency i/r(4+vrbnt ujc b8c-y s 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 acrp,m5n p37vn o0p6bwpo oss an inductor is doubled, the inductive reactance of pm5vpp6o7w0po ,b 3nn 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 voltafhbeq5 +el dq9m3gvs// 2k wr87-nhk sge across an inductor approaches zero, the inductive reactance of ts/9h 58+qkk-lqerw2fhdnge 3/s7vm b hat 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 thc 3 g fwdng ; moiuyox7ciq1y7(,qfn9*v.9u3o an AC power supply. In this circuit, the currentqfuo7g,1ongyq*c3 xunid hw .939 m cyvf(7i;

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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 rs gw 4hn;6xv5cvw dk.b4x2(zwhat factor when the frequency is triplezx4w( .vbkh4 56x;s2dr cnvwgd?

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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 zero, the cl)zev. bb*ms nqxwqr).c56d(apacitive rm5lqxc)nv* ze6(..s q rb)wbdeactance 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;6f- 2d fy egmppho3)r and capacitor in a froye3-dhfmg 2 6pp;) RLC series 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 an RLC circuit is defined a-r: jpxxf8yn cubm8 (8xr,mw)v1pf,ms $\cos M = R/Z$, 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 theenu/3j 31ji me circuit increases if R increases. When is this statement true? ene/313jium j

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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 i5ix zr*9+puj0xy, -bs ;e mqgincreases 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 the9pbkilx51+6c2x qr9 fq) zhsw 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 andqt.j deh0c;e5 the capacitance both double in an LRC series circuit, the resonant freqhq;ec5 . j0tdeuency 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 v2x3o dou41k-;sgf y capplied 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 ocs- /ocuyytlbv. d64y.z1ngy7curs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform c0aba-/yqec 5 magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.a5qya be/c- c0

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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 radiuswk u.pxej1of2-- dkn ; 0.10 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 field vector are perkf1 . ;xkpdw2-ej-uno pendicular.

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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 unif4t) e xco/b9 6exf mthqvu*mlxv i4*)0orm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vec0umiq*m/v t)44 l)fxocheex v6t bx9 *tor 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 abnf51m(h n.lu rea of an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil cqbf3c sd+q zt-8g/g1tsn j 8j9r59pbchanges 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; ; 9l bdi7rn-afm5cmo6 kzf9i yp(a:a 200 turns of wire on a square 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 s, fikfb5-i a:n;9m;7aica9op( lrm d yf6znd 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 15 turr2(8n ybua e3tns 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 anobo::q* yfo zg. )fo-hd 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 4m .-isy9h eba-ivkoe93fed:bwt3 n* flies horizontally at a location where the downward componee3 b94w hfk3 soe. e :b-ma*inidv-t9ynt 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 7x ig5)u5ji0 2 fwfoxvp)+d xen8lx8d long rotates at a constant angular velocity of 2.0 rad/s abou xx5ojefx0g5vfd))i8d l2+p 8iwx7un t 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 an,qep wt :fq5.eq yb8 *1uhr5hkd 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 ai5, mkrge3usc lr.7 7lw*(6phybnq /jrea $0.090 \; m^{2}$ 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 rectang:(ift zz +yai7;yubk 7v h9gp2h*9fyiular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what w 7 z+ai:bi t9f2vzhgp(fuiyyh;7k 9* yill 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 t5pne0ad4 ejntv1 ahx(45fe n2urns 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 pzokr6vn* /tn ymhjt)m9p4 0 +to construct a simple 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 +n96*zhky) ppr j4vmt0mt/ onarea of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maximmk)h pvj oxl258-v5ca4nh. lcum $emf$ 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 hand+ gap)d7sul cz;q9a eb+w68 ve a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motors0cjc5v byi r .gq4wivzfz*e- +h*; 2e operates on 12sv ;cz*.4 ejz5+fwb*egr qyvih-i0 c 20 V AC, and 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 f4:+vam*pbohnwj * 0lW is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up curren f*phj *o0:w n+4lvambt?

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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 c+yg ho7oa5hp f/ro a.*onnected to a 24-V power supply. The operating current is 1.0 A at full speed. What is th 5.oh fpo7oar*+/hgaye 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 resi0zrk )r)0q r0caig(zqgbm: y+k3hkr +anr9b, stance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full bk z0hrg3 ),irna :y qr(rq c9+m0)zgkba0kr+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 reduce a primary voltag8+wvzix, u3 i 2x t(8oyjmel5r0k-omic s68oqe 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 14o* ynrgbi (x,*abdt* n2 z,t*a A to flow in the secondary. How many tu in ta *brza,t(g,dn*b2*x oy*rns 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 115hawwz8cv8sw x-,+w 5otie )a 0-V primary if the 24-V secondary has 100-8s) w+azit5, oax5wvch8 w ew 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 anz.3wy yh0rh7dn 6i8y5d3cy zrd a 2000-turn secondary coil. If the currenzh3i 365d. h7d8 cwyyr0yzy rnt 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 in the primariybdh66n-,oe. v (*f wga wp/iy of a transformer. Assuming 100% efficiency, o-v,w/yi* ( 6n.f 6gib wpedahhow many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon slnuzt l :(kq3xg*m5r bh pc5:0ign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the prima(lgnl rzk b*u0hmt 3qc:x55 :pry 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 secon3x3g07r lw rnkd 6p j3/ph9hegdary coil. Ih/ xglw0pr krg36eh3p d9jn73 f 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its seconfc/fjm:c yi6+ib+ b9adary coil. If 120 V at 2.0 A iicijb+/abyc 9mf: +f6s 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 secondary has 200 turrfv2 5n6 gftq5+5 ydaxns. If the input current at the primary is 100 A, we can expect the outputtygxa5q 562vr d+f5 fn 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 transform 2m64im/qtapu+hbj(ej (n 6jver 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 secondbjajm/2upj 6( 6v (inh4q+te mary 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 has 200 turns. If e*4gnumvs 7tlor-2 w8o r +.cnthe power input to the primary is 100 W, we can expect the power output of the secondary t8c lmwoo.s4gv2rn e- * t7+runo 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 voltage is usually stepped q/gkbol1n;trvvy;j) / v98 apup 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 secondarj/p ;y8gl br v;1otnqv/v 9ak)y 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 steppedcv 38m wh n-c;q38kjym up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission li m m3y qh38jcknv8;wc-ne.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage hsx lenmz2d9263yprz*z 6 ify .9d: vjis usually stepped up to 4500 V by a tra9zsvz:m3* yd e 9 jpzxnr2yhl.fi6 62dnsformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 Wp ltc8w3 ubq1 is/g4k7. A generator produces 100 V at 70 A. In order to reduce energy lo/8u7cw3qpitk 4 g1l sbss 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 resistance of 0.60 W. A generlth7 h+qb. eo)-vy 2jvator produces 100 V at 70 A. In order to reduce energy loss due to heating of +7b.yqjh o 2letvv)-hthe transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line atkhh 1,4xtpgfd q5)l.ms nmmbz,w3 7* e 1000 V. How much less power would be lost if the power were transmitted at 3000 V inse),p*hb h nszm,1xmq wm.dktg547l 3ftead 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 /j) bmtyve 59bV at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.01jbt)mb5 e/y 9v0% 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 stored in the coilaheow sbs+d oh4 ;3l/ 5wpic*3'sdwsoa3 s5b w/ho4ch3p *+ie; l magnetic 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 resistor and an 18-H inductor. g9o8yh-akli c 788 clo What is this circuit's timi9kcg o-8 ahc7ylo8l8 e 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 voltagap: w/g 9yej7ce 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 A io:/f3 ozjjfd9w0d h.bg 96jjC 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 A(xkpf7xq g7 v3n6d) joxy+c5kC outlet. What is the resistance of the lam p xf56( n)ok jvq7g7x+yxcdk3p?

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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 connecte5h ge59 )wt nilv*zik3d to a 120-V ac power supply. What is the peak current through tvgew*n5)kiht9 3 5zlihe 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 cr7pd mx (:czb9onnected to a 120-V ac power supply. What is the power dissipated 7bmpc zdrx9( :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(s* mix roszl )(dhazmx)9 e r8.378a3vuxwma 50-W 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 /zcz t*/bx(tnviw8u/a 50-W resistor 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 reqb 4px :coctbu9+2l/h;gtl8 s1jrxl. sistor 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 1.05u7 qzc cu7f5b-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 2.50-mH coil at 1000i8+wp0-3wya) 7.uitf rfaredtr 22ns 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 14xtp8)ix 81kwkh9 v 8va.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 +f os) pd9 rukpatfu*+z5fi8q9w 8o:p of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC az/vx)74a tvzx3x o hojl6:4zvt a frequency of 20 kHz is applied h x)xzav 3v44zt7zxoo /j6vl:to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 1b,s y qv u80awq0lzt: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 zk+;oddycqcw3u .eaa*o+jrp 9w*y01qd: 3w j4.7-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 ms, kvexm24qva+0f, mtbr45r 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 reactan4t soycl a)dre j,u96,ce of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF c6-g 6a0.rhdt hwox 6ceu3pg 4tapacitor be 100 W? ehwutdogt43h-axp6r 0 6cg6.

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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 capacitor at 1000 Hz1 ny07syoc :, 9qn sij3bnfo0q and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistanumw 2;mvkq z(2p;tbx4 )t;ywrce, 15.0 W inductive reactance,4m;) (rt ;b2qxuw wvz2kpm;t y and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 19cr:o7b nb1 *ptxy -:iyi1ftp00-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seoi7 p n:f1* 9itbb1pyxy-:t crries?

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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 a8)hn2g pkr/ ,hxav2q+ns7 ktw 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connecteda rk,gn+kpsq8/t7 2)xhwhvn 2 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-r mg+-(myrq4t+ 0) yiw 1mrwbkmH inductor, what is the impedance at 1000 rr+ -b0+w4mmirm (w) yk1qyg tHz?

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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 connected2l;j+)a mbd vsn)hec 2 in series with a 20-mH inductor, what is the phase angav hsn dj le)2)2m;+cble 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 wits 9ncl.v5ni(a h a 20-mH coil and 1.0-mF capaciv.(nnls ai95ctor for a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resist o tbxu( ixsw)/s.v:2sor and 15-mH coil to get a 2uo iv)s s/ sbt(x.:wxtotal impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in seri kqc.n2yc39dues with a 450-mH inductor at 5000 Hz for a total impedn.3cyukcq 2 d9ance 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 be put in series with a 100-kW6s occ5zse ex/h)sl1; resistor at 1.0-MHz for a totohe6 )sx51/z cssec;l al impedance 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 seribrv8d0m: ymy 7es with a 20-mF capacitor. What is the impedance at 100:mvdr by8y7 m00 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 i*x4si yc a3d*vn series with a 10-mF capacitor at 1.0 kHz for a total impedance of 4x3d4y*sv* cai5 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 capaxjrl8q- l-xzpqpq (y9;bh2 1qcitor at 1.0 kHz for a phase angl( qljqqlp8 2;yx-1x- hb zrpq9e 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 resistor at 1.0 kHz for jr9zac*q)v k -a total impedance ork cj-*z v9qa)f 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 120mx8-iy6pw, tu Hz. What is the phase ani m6tw-py x,u8gle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz sou)+:v) gfhr if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conn)h vf :)ugo+rsected 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 1 kzfr*zf)kgqi/ hu2gw co+:(;0.0-mF capacitor, and a 0.350-H inductor. The circuit whqo2 u ri:f;*+zgc(/ k)fgzk 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, a capacitor of capacitive reactance 30 W, and an inductlw ,c0*v*yuz--nagoc or of inductive reactance 30 W are connecn*zuv-cg- *0 wayl ,coted 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 angzixq0 s6 7: nbklhro khy4x3f6kc.t-6le for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-H -6ki6q :.htnkx 6bkolz7 y4sx0rfc3hz 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-s dm p9shkxxd)9e,lxu1i16f 500-W resistor for a phase angle o9 smdk6edxx-1s9i) xhp,1f ulf $40^{\circ}$ 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-v/r c( lyo3)nlmH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from t/)(lovy3 rcln he 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 serie:ksjfddi v;afl 76+xg7 iudo) ,-.nx xs circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capav+xl6ou; i djf g,kx.:s7n) x7i- faddcitive 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 h0qb 1;oh obx8v0g7mpcircuit 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 60 W and a resistance of 30 W.z zgq85nv(t;k3acadxg nwi*je34 99 j What is the power4t9a985 djjwa3cxk;qi3zgn v e*g( zn 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 containing -w7.nbk lw7+ p :vpqhoa 50-W resistor, a 10-mF capacitor, and a 0.45-H in7: qnwkwv7h.lobp -+ pductor, 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 frequensrcm1.2*g xjnp ,1mnxktmon,7i v0 *fcy of a 1.0-mF capacitor and a 15-mH coil in series? xj k *mfm*,1xisvoc71pt. ,r0gmnn n2

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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 capa * jrn)nab6c)tcitor for a resonant frequency of 10 kH*r6cnna)j) btz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonano3kwp7tjrnm ; e l55r6t frequency of 1000 Hz?rokp 5l73nj r6m;twe 5

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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 3 z9kdg:(q a b/bfi;)gm0-W resistor and a 40-mH coil if the resonant frequency of the circuit is toq:9;b)za( bigf d/gm k be 1000 Hz?

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