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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following )rw tgnxc(yzbt -(r;5are units 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 -cdv8. gysgd13 -2jp.bqycgvbw)j;nthat 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 ku*lvln7 : b93kl4 ;jgtv5mpp aind of change on tn vt9p*4m:avl k pl3;gju75lbhe induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetis(cr1adho, ;r 9ib6 legvy51bj ri92n c field through a loop of wire produces what kind of change on the rd ;5gb1sc1b6j i ny2l9o,9(er i avhrinduced $emf$, 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,r)x+yuoj2 5ueq, q sf a loop of wire produces what kind of change on the inducju sfx q)q,5eu, yo2+red $emf$, 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 ;hkd*,3as6 miy jzf4xs4mo0 o9 ielk,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, the direction of an induced current in a cocaw6h- sgfa*co 7ow/ .nductor will be that which tends to produce which of the g 7s.c h caowfa/o-*6wfollowing 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 tab/ nmge(o sgbrgvj /w u)ir3eg6c.nx5(f s;( 5jle. A bar magnet is held above its center with it u(((vg oenxs)r/gri 5gse.;b jn/6cfgw 35 mjs 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 bi+8 zf/xaxb.e ar magnet is held above its center with its north pole pointing down, and relea8eix+a/xb zf.sed. 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 q9-ge0l c )zsqwhere the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sensgq) qz09-sclee 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 fn+3sii )a b/fthe magnetic field vector points straight up. The magnetf3a +/ if)sbinic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnete*bd.d1l6rf+m v 5u b0o vg0ofx.0faqic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced*efumdqxoov ba v.0b 6f01 0lgd5f+.r 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 carries an ever-0;dowq)zrd6 a:m56po 8jmpua increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced curr )r66 ;:o8aq jm5 mopd0zpuwdaent 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 tz1o(o-dzikwd7* )-kf7vi(l 4rx pix bhrough a loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will bel1r vdo7i z-ix4-x wfbpid)k 7(( k*zo (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 constan 4w+odqcs- qk1t angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, ws kq-dqc4 +w1ohat 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 abouti 87v (atmzwl96d a9fmtw8*qb hq+tu- 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 looplmzwwihq* -9 tt(q 87vd6+f8 tb m9aau'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.9w re7ws-qn 0jp4s)yt
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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 ;9,p *mxy6zt swsl/fb 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 mc , (;uarcrb7qbq-yr +agnetic 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 eas5+ / bh2gp3b yvqrbj a*3n9vest-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential inducvngpb/eb2s + 3aqh*39jry bv5 ed 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 :i zvts2oc b,nx6o0h-b1.v v sat 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 pnnlu: : ate:)x,h3sz 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. Th pmx/b729 ,okjmhw r,oe frequency of the2wkpb,97oh/m xro, m j $emf$ 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 devicemd7qs3. dyn1 eza6c fepb74r9 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 de6 *jnu fs)ypa,qv4j3x qhnj45vice 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 cois 07hgea jnihd*m ;*2jl contains more loops than the primary coil then it is 7ai2e* ;h n j0gmd*shja

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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 seconda of/rl2 d8v 2ckjsjv1j*bf 13xry coil then 1 2rsvfj*b1c 3/2jj ldxvofk 8it 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, th23 vk1h)w ;cu3cf-:nf 9x:i gsgcq xyse 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 resonant circks pi 6u:8xe)iuit,

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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 indule uaaz)or1 +m5 ps+t2ctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battea+5l p2 ate z+1sromu)ry, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an id8zxlfd+g13;uvt3 i rl o8*( qbq(fqy feal battery of constant terminal voltage. ;3 u3i18lfqqfzloy*8(b r+fx ( t dqgv At 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 resistance R ispjzvj+gqo1t8zh.f 0 0 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 conkp -oj p/o:d,gnected 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 toclflb *gzqhs7eg; i.i:/ 2 sf3 a battery. The time constant for the circuit represents the time require32b*l h:.igf;sc lqg7/ zis efd 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 serie,0(:7sw 47sbnx hbu( 7f xiprbzzy9hks to a battery. The battery is suddenly removed from the circuit. The timsn7 4fziuxr7:(bph( y,xhbkb 90 swz7e 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 h /, -da;uenz+va(ov mthe same units 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 th6b)9tlb v4dyuqw .a7qis 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 connecte4hkhz7r8ocac (3 m,em ::lzr8so,lbq d to an AC power supply. In this circuit, the currener:, (l34 7mqsc8o8h m: al r,czkbhozt

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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 ciribuu3rh h pk69yrz5re3a8o 6/cuit changes by what factor when the frequency is tr zhy6krae hbuu9 35rp86ori3/ipled?

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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 across an inductor 3 3r*je6-;lycv8w. kmtoxiu0ncwb* c is doubled, the inductive reactance of t jk-0b.nxe63i*wc8uvc*roc; ml 3 ytwhat 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 across0v 7kchd6i80m nu hen+ an inductor approaches zero, the inductive reactancenm c687eu+hd n0i0h vk 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 cir(r sb;tsv6jl 9cuit, the curren ;t6slv9sjb(r t

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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 acehnq d i0 i(,gg7k3a,t circuit changes by what factor when the frequency is tripledik3n iat7,g(edq ,gh 0?

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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/4tj+y:fjf ( peu:v phitivjy:j +tpeh :up4 f/(fve reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor a5 p/6x0(bvi9nuin+ wayulgz 9nd capacitor in a R6+vn/ 0 (iiugy9alz9 w5pxnbu LC 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 as 4,2lpr j1 hsaq$\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R incc q2alld qp75,reases. When is t qd lpaqc,257lhis 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 incdumopllz6 - ik-jb 0, ./z*gbg5shu.creases 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. hd ,(-1qm.deh8y hn 16zhynx5b gr7la The impedance 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 and the capacitance both nxw0ax l.w8 f3o7brzyhjx.71 3,rk vzgv1 d5hdouble in an LRC series circuit, the resonant frequency ofx3 .ag x7nhvof1b5 z78kwrwv hrz3. d1l,0jxy 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 appo5 aab(h(3 cqkclj:q:lied 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 c g wiraln8 4)ha ofmh-)zq7+,wircuit 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 rotatingibrvhyx /c,j 128 h7ei 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 18j2hrb ,c x7yhv/ieivector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a unifoz,ln)i a2 vh5fq:kp7me8j* kvrm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane pak, *k)ih7e:vn2 j8zfm5lqvof the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform u cycl2*3,k mdmagnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fielmk,dc3cl u* 2yd 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 adjustah ml tnxk ;-w;pos+9emc0 lgc88s6 r/eble 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 c(pw8uvj +l ws:hanges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wirepg3 8hce 4/0ec*t+yxho7nkd l on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to th*03 4 e 8+x/dnlgchyh7tokpc ee 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 with 15 turns and an aretej,6jlhyj9/2 kwv. k 6: oypja 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 anj4 *k9np h aaard)q s*,c4(ebyd area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a locaobr h wb(boj*r jcr;-r 5sf-/4tion where the downward component of the Earth'sjr( 4w/ --obor5 j* ;shcbfbrr 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 nzo)rv 1ggb96 )zhl g9is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant 6 z1zl)9)gogv hnb9grmagnetic 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 anepe2sip+ :d.c+9mysi d 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 wirepx2z ph+lii nv2k:z8 4 of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loopsuq9/y) b ysthx94;s cti6/z.zzjzp r. on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to zzxz y4h6/qtr9) c9b yzp;s uit..sj/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 ofh9ze 3i6leox*c(vg ;e area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with ani9*x dfva6p/dl0 hdy) output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotatiniyha9ldd0) pdvfx 6/* g 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 w/5ce2wu:ft7w qsct.uith 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 resistanc,b6avi:xbb 4 3xaep2we 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 resh7e v5 xj t2+7qrg1m9hg wtx) hwqtm,(istance of 6.00 W. The motor operates on 120 V 7mxwqte5)r+gmqh7,x9wj v1 gtht(h2 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 W isn;m7oymxd8a.xvrh + +5c pu6f connected to a 24-V power supply. The operating current is 1.0 A. What is the start-n;p5dm r+xu 8v+ 6.fyh xmoc7aup 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 r6 ky6 so2yhf 0ess8l3fesistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the backo8 366ks s2sh0e lfyyf $emf$ 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 intern j1emi*bld 4d2al resistance 6.0 W is connected to a 24-V power supply. The operatin1de bl *i4dm2jg 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 primim(ujdc t l9gvim2,49 ary 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 sc.kk 0:3e2y :w hvbkmrecondarykv 3e:hb: rkykm20cw .. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are nec j a(rr3u.e1gxessary in a 110-V primary if the 24-V se(a.u rx3 jger1condary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn1l:fkrzli67* hy:fs u primary coil and a 2000-turn secondary coil. If the current in the seconda hi:fr*6lz 1 fl7skuy:ry 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 primary of a transformer. Assuming 10. 1p nflbyn,/w0% efficiency, how many amps at 24 V .n ,1yf/ nlpwbcan 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 V at 10.0 pb7b(;l 8 hu .iga*uoemA. The primary coil operates on 120 V. What does the prim;p8b bgeuao*l( u h.i7ary 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 30089.j+t zb0l ,ltgcorgc wmk,; ts2w+a turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present g++ww9ctm8, a tb,0t rk.j2o;zgcsllin 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 i4i 4u k; w-gps0(swcjwts secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the seco p (wj;s4kuwgcs04i- wndary?

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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 3t f(gmq52zpg*o rlh a,:yx;ksv /h; y100 turns and its secondary has 200 turns. If the input current at the primary is 1(*/az5 tg;2hfqrgyk;, o:xl hp3svym 00 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 s +qbikb4a (n3oecondary has 200 turns. If the input voltage to the primary is 100 Vq ok(n3aib b+4, 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 secondary has 20lbo1, lk i8 1q+j;cl v4si-nzs0 turns. If the power inputllo +zss1i1 qi;cj nv84-kl ,b to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A o 9qvl 3z5ug6 w zpavrtencz*1m *6 dlup)ec261f current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resis9r5l 1q2* e pzv3uv uwdma 6ccgzlz6e tn6*1p)tance 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 us uzw*1j86fhhdually stepped 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 trans*81d wj6h uzhfmission 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 voltbr9s h owbe,+ds+8-a+b +svzmage is usually stepped up to 4500 V by a transformer and transm +8o vb+-9+swdmsr ba,sebh z+itted 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 resisn)c u4x vju m. opimv126:la1htance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to hepvv :1u n 1.mcohl2a)mu4xi j6ating 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 reze/kwc a 22l0r6npc b00d1d unsistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transforcw02n0eldc2 z6n /rub1padk 0 mer 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 a:t r80xcry91qm)nyb 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 18b)q0y: yra 9cnmrt1x 000 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 4421q/ia uni5vv 0 V 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 if1q iuav vi/n25 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 stok 9/nr3;e3 *veiw0sxoaujpq85) zacsred in the coil's 3aacv;9 )rs zx/iwo psue*583q0k e njmagnetic 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 resist 3kz;9la ) /5u3dxbwgx:yntpyor and an 18-H inductor. What is this uby 3zxnpway/t:35kdl9 g)x ;circuit'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 vol0hb0tl.cedzl ot(c u :. 49sfanjfg;2tage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak cuh, xnise4,u (pxg9 8fmrrent?

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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 axd* wyk)o j-9p 120-V AC outlet. What is the resistance of the lam 9-kj)w p*xdoyp?

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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. rfz9v1as66 r3rg* n2-nowen f What is the peak current through the resisafn691 r62rg v-*n3onswz erftor?

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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 htmvfvvx;7zr81x0ql hg d 646the power dissipated in thhm0vl87 4 xtr;6gd q 6vxfhz1ve 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 resistob9 jw p2kt ke4ut99-jg+7k8. acusr bfjqp 72jr is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W r+ixdso,ueh 5 4esistor 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 w k87bvsn3t +d3/o9hs v.i lhm50-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 1.0-mH inductor at 60 Hzrcc 2rl)eu74 l+kxbi(?

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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-;n xdyz6 : 7m7jrbqtrd+7t *pemH 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 reactancedr h +qrs 3u5;jgj6r;q?

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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 induvhk ijdf d::,r7zlh.-ctive 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 invoj;kb. 6 ydakx *nz97ductor when 120 V AC at a frequency of 20 kHz is applie6 yjdn z*x9 ovak.;b7kd 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-z e+q:n:xr h/emH 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 rea3p5k5xy ;oktictance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance ai-g bnnqoa,y /+1 z4dnt 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 capa 3a w5yw4tqa5bcitor have a 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 capacitive reactance of a 0.010-mF,7o8g3mmgg o( *wqb3lzsw : (vcfkh-w capacitor be 100 W?og,- w37wq:zg 3(cv(l*whgf mm bo8sk

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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 Hz and 5.0 b4u429(:h ryijovsf.f n;p ztV?

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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 resistance, 15.)x8lincw 8w e-hy5hy6z;(0yde(dmdm 0 W indm (zixn y h(w08-myd; edwl6c 85yhd)euctive reactance, 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 100-W resistor, 20- o7 w5 ,eksg/u *,mpqpuivmgo g8*cx5;mH coil, and 1.0-mF capackg5p ugp8 ;g c,*, eoouqvs*/i mmw75xitor 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 coanm )8 0v*pcgf/v9dd til, and 1.0-mF capacitor ap0 g9*tvd/fvma dcn)8 re 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, what is the u82tr teh8*ls imtu8eht82rs *l pedance 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-m9ye1pca66 fuz blz 1/jH inductor, what is the phase angle at zy1/eafl b 6 pzuj9c611000 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 6o/ : ajtme- f27n4rtnvsxx0ein a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 1te0ts2a4o-/nr 6:ef 7jnxmvx 00 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 w0n:a5clm6 u fcapacitances is needed in series with a 100-W resistor and 15-mH coil to g6mlf:w0ua cn5 et a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put i ; vp(rszbp:( y8/7pf ixd)qwrn series with a 450-mH inductor at 5000 Hz for a total impedance of7v8dr fr iz xp s)(bw(y;/ppq: 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 a d-9yjn.m1 , s;jhtxohd5j0m ut 1.0-MHz for a total impedance,t.sjo jmdu 5xhhd1- 9 j0;ymn 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 s2f p* ;7 xk8(gllhiky8yabf(meries with a 20-mF capacitor. What is the impedance at 10ila *;87x (kfmg(8bp 2flkhyy 00 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 seriemy2l :q.) ptegs with a 10-mF capacitor at 1.0 kHz for a total impedany)t.gp l e2qm:ce of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 cqg7sl*sadr j r(in5+xusd91u)h h2( kHz for a phase angledu sj)sx2 *rha i975slu dn (hc(r1+gq 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-Wa8g/x x6qqm6 i resistor at 1.0 kHz for a total xq 6/qi68xamgimpedance 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 withc+: lbgx,q,jsqu v/yu03 xl p0 a 100-mF capacitor at 120 Hz. What is the phasequs0, xy:+ lg/j,vxp3bql0cu 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 sf s7dse uqc4 a79b3+jt/ia(jbq xm/2 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connea(f/s+c/s 7mdbs qbje2ju i94qta 73xcted 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 10dtz a+,m.sfthx qb;(+ 0-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-.,aq bz(f xth+stm+;dHz 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 (v9-zlmefu7hf; c li) reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuiz fl7h;cu9 f)ei- lmv(t?

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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 series RLC,r t*x b )y;zfysnfl+9 circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz poweryylf x9z,+nf) ;* rbst 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 necessar-hqt0 jcd v8b2y in series with a 500-W resistor for a phase angle of h-t82qbjdv c 0$40^{\circ}$ 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 i e*337*ergwtrjmqc(.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum pow3iq*m 7 *wtee(r jc3rger 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 az v0f y1bd1q,xc series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is conne z01x1fqd vy,bcted 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 circui9b0g 3whypw *zrpbn *5t 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,xhf u5e p9kuj(+qz,t an impedance of 60 W and a resistance of 30 W. What is the power fa9uq zfxup j(t 5,ek,+hctor?

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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 a 50-W resistor, a sc tk0-vyvatyp)5m4 . 10-mF capacitor, and a 0.4cm va)0st4y5yptk- .v5-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 3ibd7)u fwcphef* .6sin series?. eps6 fc )i3h7dufw*b

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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 /es/tzykxz*f0, 3dcakvw1(s*q *w bwwith a 4.7-mF capacitor for a resonant frequency cve, *a sbf*(3zx dq*kw /ws/yw0t1zkof 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 3m t9vj jfc,mw j,w1b+gp8k-h-.7-mH inductor for a resonant frequency of,fj1w9cvbt,hjp m-wgk 8-mj+ 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 withl*2. mw8+qx f7zfvetx a 30-W resistor and a 40-mH coil if the resonant freque m *tz28e7xvx+.fqw lfncy of the circuit is to be 1000 Hz?

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