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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 magnetic flux ex8nkqi1: fk:i tcept

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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 inducggo5dxf 9+6jawasrdz3m +j2 4 tion states 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 ofh:qw(d hv6fter5k (ynsxpk*na . zy p--++s:m wire in a coil produces what kind of change on the inducz m s-e(xkphaq*+hvwy-5 s+(tk nf:6.p dny r:ed $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire producesu9vad y2udgs)zq+3l:ku,sc 7o(p co0s 54iue what kigs0yo+u i c sd,c(vsu:7u ke)3o2uq 9 4p5aldznd of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter ofh9/ u.7v ;9jl ;-fgvp ;(ickjzn vrird a loop of wire produces what kind of change on the induce -vn9;ic vk9rdrp(lfj;h7 /. uv j;igzd $emf$, 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 fr/iy:d( uwtj 1tr m(*g )at)mnpom a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conductor wih r,.+hwblp, *zgg/iz ll be that which tends to produce which of gb i+,h. rz lpwz*/,ghthe 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 mag)oca.uw6 r1yp net is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from aawu 6rycp.1o )bove)

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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 horizon*f0qe4pqkb;q a q+rmdc (n(91)sayf w tal 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 induces (when vf4)+fqrw9p k*cd( qqe ba; a0(nmqs y1iewed 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 fu+gj,)lu 0nwe,4f 1mxts-mbr s o.)ikield vector points straight up. The magnetic field vanishes suddenly. When v)4w,gxsm1luk0 , fn bm+-i .s)rt joueiewed 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 levelt00t ohxltr)7 table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from7r0) tot xtlh0 above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontalqt);jq-66mvlu*r s )gjq- eaq table top in a region where the magnetic field points straight down. The magnetic field disappears s* s )q6jtje -gmvuqql;qar6- )uddenly. 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 horizontaldtygfcm w xco4e:9xqqzul,)j-2 -x ,3 table and carries an ever-increasing current northward. Two coils ofj,:qyg-zl uxe oc)f4 -t cx3q9 wm,xd2 wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire wi hi y7y9 .p2boed)ugqpa-aq)jtw i/l3:3 kf9wth the north pole entering first. As the north pole enters the wire, the induce gab -99lph7)dfijq2ouwyy)p/q t we ik:3a. 3d 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 an ay wiirtr7 i0m6w,.r;5u lfx lqj*1;knxis whose direction can be varied. In a region where a uniform magnetrrf*, wi wunylt56jrki7i10qlxm ; ; .ic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis wt3sr22. wijzo( ya8kufk7n5d hose direction can be varied. In a region where a uniform magnetic k8ti s w.5 732onafzy2udrj( kfield 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.by*r) f/lv2 ah
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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 pv-ua6ed.kxi0 )i k;wan $emf$ 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 magna d:ck.s 56n5nhipiu3etic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west diredvuqx qnhnds: ew.kkzj2)4/,ow; r0: ction) is moved northward at constant velocity through a magnetic field that points straight do zq,:x k:4.d ; q2urjwoh0ennwsk)v d/wn. 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 rotal teq:m ) a0o/c0.qnxmtes 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 generatok*2cz oj5.l)+ tiplnmr transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frequency of 1 xo oho-(r:cfthef oo(1r:o x-ch $emf$ 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 d7 .jdd.o9-bqxd2nirig iw*ou7p4 5 hu xl7*ez evice used 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 dkj0xc 5 a(s)xh+b 8xv2yml4ppevice 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 secoq c87e7+ h.b)ipii5wn- ifnyi ndary coil contains more loops than the primary coil then inyii7-hni. qei5cf8b+i)7 wpt 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 more loops thanum nl5zz:*l:e f6,ngc the secondary coi, g:*umnl zle5fnc: 6zl then 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, the03 0in((q8q acv. bodvvjen y)6 m-qvmd7 e+nd power 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 resonan3uq snb-ea/w 5t circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connf9, e,gnvl+h6f2 mopd40 a a:d 0y-wpk.bouuxected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistor is.eb aon l0-a6hmd: p+fk 0w,f, dxv4p9y2gouu

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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 ayx20 9y( uxdjvre connected in series to an ideal battery of constant terminal voltage. At the xj( 0u dv9yyx2moment 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 resistance Ru -bi2ritrm: oo 8.hb as+1 qio1.qh)b 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 uhu mtx znx03;orq3f.sq8/b 4to 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 connecteddv3zyt9/a5 zpbo6u6 k in series to a battery. The time constant for the circuit represents the time required 6dvtokzu9a/5 p3yb z6 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 battery. The battery is hba wdo4c.;,ert p284lag;zp suddenly removed from the circuit. The time constant for of the circup, ;48halcw.ebdta zpg; 24roit 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 exceixl*j w kq8;h4pt:

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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. )(85 b p se8vqeqh5oxs 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;* .d.)wp cywg23l ( l;odc3chyqrmh 6gt9jkx power supply. In this circuit, the currentxlhj 9ck;w hrmdyg)c6lc q y. p.(;g *t33wod2

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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 factjjsej9uu )c lz fss/6x3j7c3,i5h ef 7or when the frequence izuuj6h e,7 5c cs /7lj3ss39jjfxf)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 acrgzjw.d0 y z2x9oss an inductor is doubled, the inductive reactance o9jy0.xw2 zdzg f 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 acroo3x2 3bnnlrdl4)* f uvss an inductor approaches zero, the inductive reactance of that coifxn l4b *3nlo 3v2udr)l

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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 thqx6/s3(wrc s ois circuit, the current3/(qos wsr6cx

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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 mq/cpva9e u)srh37s ( factor when the frequency is trm/)a9 r 7qhs ue3(psvcipled?

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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 capac kl6p,mq+ od -fhk6vf5itive reactance of that capac hfmovqk6l 6f+kp,d-5 itor

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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 *6si+b/ctz8r ;qg d sbi5ab7e the inductor and capacitor in a RLC serqb6+d/ ;a78gzi scs *rbe5bti ies 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 RLi4xwmexw74q u;l9 p b+C 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. .btda6-u yd1 rx*ayo -The impedance of the circuit increases if R increases. Wh dyd -ayo.tra1u xb-*6en is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if4lxzo/4q5:oqf l tu 3j $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit increases if v4e/gvo 8,v/f.s una .iibwh -$X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an L+9t:m3thws mi RC series circuit, the resonant frequency of ttithw9 :+mms3hat 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 ao85di xk7o.ij 20 dan-g3lwqkn AC applied 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 occt hb. kzg3.3q4/pp8h.ve sg/ma q(beburs 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 radiuscaic68 56zt bp 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 magnb5 pcct6i za86etic 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.ta+v ;3hw 7viaab0 ea;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 perpendv03 a;hai+ vaetw;a7bicular.

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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 unifow2)izf mc(ap .rm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the mafawp.)mcz2( i gnetic 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 adjustab akdyb6r o::g8le 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 coiltdqq( zc k8g7 9jrv4 zyyg()kl)k)fo4 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 turjte ja9 -.t+(as0ipj/o4hrdrns 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, find the av/id-eopjajrtj4( s9hr+a 0 .terage 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 turns and an js.i fgagn:jhk v-35. 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 area 5xb(oqx e4m.2qbkh x5 $0.20 \; m^{2}$ 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 jwblj0tc jrj(p 8(v8 6horizontally at a location where the downward component of the Earth's magnetic field is 8wj0 brctj(6( lpjj8v $6.0 \times 10^{-5} \; T$. 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 angular v44xh zb+ e6jueelocity of 2.0 rad/s about a vertical axis through one of its ends while in 4ee6+zxj bhu4a 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 abzumfy 6/(*)0s ,ilbadgn xt e;+ 1mrwnd 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 100av 5c+coxj38csgwk( *p6lt8q 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 rh5yhfg8 :n7g 9 tf pdx0 (owwsd) 9tsk2x:ez(xectangular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 120) s 7dke(hhztg05xn fdw2poy:xtx9w(f8g :s 90 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 tudjfy fo;.7+d nrns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC;hvyau;,4khe o.a mr 1 generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic fie;eaa;,kyr41hov u.hm ld 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 ge(g:k t*maxika9b ek+;ox. me :nerator 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 t weeknik8 gk4n- 1.q-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 motor operato24t qqihvb ;q2bwz98 es on 120 V AC, and when running at full sp8 t;v4 hq2o9qbzqwb2 ieed 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 resistanceir;ifro9:vemu : ad,4 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up curreedfvm:u;ri i,o 4ar:9nt?

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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 internrjqv pd1 j4j.l+(.yy k 0p5 ecmbmm)y,al resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the bap4r(+e0jc15vjm y,).l ybj m m .yqdkpck $emf$ 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 resistanc.d 48da5j8pxfczuhc 4e 6.0 W is connected to a 24-V power supply. The operatingzjac.8dh4cpx u85fd 4 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 reduce a pri;t y0 jg4mvv8zmary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the ziz;.j9nlabh*6edj /secondary. How many turns are in the secondar.* 9;z/lnijdzheba6 jy?

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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 mjxd6 p;3org 9bany turns are necessary in a 110-V primary if the 24-V secondary has 10brgd p63jo;x9 0 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 and a 2000-turn secoecn.(rn pu.oto*c .)g ndary coil. If the current in the secondary is 3.0 A, what is the current in the pri (t*nuc)o c.e.og. rnpmary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. suu+:*9* bn.r qhveb1gh-pk fl 00icfAssuming 100% efficiency, how many amps at 24 V can flow in the secondary9ihshgl +q0c b-*1 fnu0e:kbp .*uvr f?

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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 providesip8 / xk.en:z +a jdwk5ilags+;v8ww* 7500 V at 10.0 mA. The primary coil operates on 1 wi;8/pvg al+xdk8+s*z:enjw.k aw5i20 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 onc y r;7.blp5en its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is apcne.y57; b lrpplied 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 tueo;yvmge, p,5./*iv5 dv2z. qyvmxzwrns on its secondary coil. If 120 V at 2.0 A is applied to the primam5;vov*dyyx i e,ezp g5wm,q.. v2 v/zry, 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 turns. 1 rfug y.x 0i*0ruluk /dfsb90If the input current at th0yk/rf u i*dub ul.1f09r0xsge primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. qn8qciv-3h 9i If the input voltage to the p8q3i -qni9hc vrimary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its seco: hunbg9;n:m phl( 0wmndary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to 0(:gmup :;wlhh9n nmbbe (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*rjhjx4bsntpnp 4 53s /56 akc current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of tota/b4rn pkj4j3 hstanp*5x 5c6sl 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 al;dwyb r96;seqql,q fkpf( 4 6t 120 V. The voltage is usually stepped up to 44q(qk,ey 6rd;9fws6lq; fbpl500 V by a transformer and transmitted 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. The voltage is usually hchte9rth v3u 8 jd+*pyp(3 f-stepped up to 4500 Vy t-e33hf h9h+*jpur tv(pc8 d by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.6f 5t ng. wj-uf2sdz6:g0 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 pnd6fg :st zj.5uw-2gfercentage 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 transmissionzro,:u- e9 okwjp )1av line 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmissio), r9: oz1jpkvueoaw-n 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 at 1 *z*; ipqk +:u.aat s6atfzws; 5yb(be000 V. How much less power would be lost if the power were transmitted abf5eia;* a+syt ( 6bt:s.q zza*kuw; pt 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+n-u v szj5kk7 0 bd3i3pwfmly/9tr/ o to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator d5rftb-ym09jnu7o+3l/ vi3/ kp s kzwoutput 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 sox7un u5 yq*cz5 ,tesoz0i9l7 tored in the coil's 57qo5, zcz 9 0oux l7si*nyetumagnetic 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. What is 17rir-xsv g 4kthis circuit'7r4v gs-1krixs 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 -mnc p 4yvbo1*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 outlqmfumb-b hy x/*48fy/et. 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 is the resistancvvx3kzxr lew7 o5m:6f.6b )mpe of the lam blvp wmx)x5k6:f.o6vme rz37 p?

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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 n2 .gfcvuemhd)d ni,ds6)/ 2k. What is the peak current through, 2edu. dmn))cg2h6 dkisn /fv the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the powyis: yi 42 pc3db ;o lo+;wz,8idtyz3ber dissipated in the resist 8o b,oc 3dpz;yi+iszi;wd4y:yt l32bor?

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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 resistoyv6(; pkwbb- 7unt* rxr 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 ke/x 0g tt549x:le, hbrx,b h z-uf/f dzgi8s6a 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 50jrleg, 05 vsp--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 ofj4k-oa m: nw+,tcdv( j a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coilce03 f,hg*0n3wia o dyuf p7f: 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 +3dq ktdgd lv9kohi/5oi).* kinductive 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 induci3l*6.oyrl n*6hgz r gtive 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 wh93nz cvow , 3a/h8fc,r p-phu1msfzd-en 120 V AC at a frequency of 20 kHz is applied to o-3cz3zmhuf-npphw csfr,v d89/1 a,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 to3 uc3k e .1vgr*ln8ltu 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 4.7rfzq 13mlay+b p 33/1swbu+- n1skeaf-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 5 kbnljbri zef) +.7,z/0 W of capacitive 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)5 u+l 1cmbukmzuay 30 reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the 5af kj4so9uc j nc66g; -nepr/capacitive reactance of a 0.010-mF capacitor be 100 Wj4eo6-rn scj5c9k6f /g pa;nu?

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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 througiwz xv pt3p349 0 sl4ktd9s9uah 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 series7i 2v6nrpxv bhht(+ g-xd*xd2 circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactancx-(v *hbdhgx672 in+rx2 vptde?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.06w c 4h3-xhqd/mqvq a)-mF capacit )x-h qcmvwd3/h4aqq6or 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 15qew3fb w.u4;d 6:w av.b 5lodu00 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are l5wbf;oqedu. wu wb6 :v43d.a connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, w6r1) jk -yvkg:q5 ufkdhat is the impedance :qujv5-yd1rkf)gk 6k at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH indl6sqvjba ju b+x5sds g*).y(8rgl :j9uctor, what is the phase angl+j svdsj9 8 )sub5r6gl*qy :xl.(jbage 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 20p:ahcnk-/1ub jfl n-: -mH coil and 1.0-mF capacitor for a total icnu bah/1 :fkjp--:nl mpedance 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 3wk 0vx2bziiq1k. z;px,km j 8capacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W3 qz i kp0;ix2j.8k1xkm,zvbw at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH indc5oh52lc;j ezxn r 22luctor at 5000 Hz for a tota5 rol 2hc2 ezn2j5x;cll impedance 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-kW resistor at 1.0-MHz for a tcd )pvsx3r.y8otaly3rsx8 .cvp)d 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 series with a 20-rtm h9nm;3ej7 px2q3r mF capacitor. What is the impedanche rrq m3m;92jnx7p3t e 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 with a 10-mF capa/cc b*w/ghy d18qbi5*pqig;xcitor at 1.0 kHz for a total impedance of c*/py*8;i / 5 cw xiqgqbgdhb145 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 a0.* ji-n u pt/d vxkfd j5omsrs;e:1jluo2 ;9k phase angle omtks5jk * ur- d .;29 eop1xf:v/njd i0o;slujf $40^{\circ}$?

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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 +bmhmg ygo; +6a 30-W resistor at 1.0 kHz for a total impedance of 45g+ob;h6 ymmg+ 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 120 Hz. What is the pa2i0/i 8nuc pshacspn0ua/2i 8i se 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 1500 Hz if ok/raip +.:w ma 100-W resistor, 20-mH coil, and 1.0-mF capac./ir poka +wm:itor 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 1+d(aw1t55qb.mvl2ox d m/wht0.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms currenlh5/oxavmd1 wt wqdm ( .2t5b+t 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 5nk9: bfja4n .y -ivdsan inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz bsv-:5 4kan i9.fyj dnpower 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 angrp(b0b+o ,0r m abx,zsle for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when conn xr0p,(zmb0+rb o as,bected 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 y xqicd/rz+ yg-, sj 6/,9mcana phase angle of,g6q /a,i x y/nj9yr+zcdsc-m $40^{\circ}$ 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 yr lwg h3 8ef, 41wmh;i3(zssh= 200-mH, C = 10.0 mF. At what frequency should thwgyifs l m1z;e3h 3hr4h(ws,8e circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W p5mus3; /bznfresistance, 15.0 W inductive reactam/pfu;s zb3 n5nce, 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 jnnkn7s /d /ic d-8*hvcircuit 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 7fdnvs 7k6o ;v+d2wce of 30 W. What is the pow c dsofe6k7n; 7vw+2dver 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 fopv u-j/a4tx q+al hft58 pk1v80q k:onr a series RLC circuit containing a 50-W resistor, a 10-mF :vp pa0 1o/ 4hvu+t5xkt a8fn k-qq8jlcapacitor, 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 seriesggu.9c2z n.hk ?c2z9nh ..u gkg

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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 capacvs ya//13 d)px2;9j wxguwjnyitor for a resonant freques j9 //p2wy1 )awxjdvyngu;x3 ncy 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.)tq+u+,e0zdpuoj6gs8 w3 w n z7-mH inductor for a resonant frequency of 10ou +w 6 )u,+d3ntzzw eqp80jsg00 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 musfjx 3cdc76-or w ;bf2it be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circ;cw6do bfi7jfc rx-23 uit is to be 1000 Hz?

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