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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of ma h-w18dd id xfsqbp0f3 a9y9/xgnetic 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 th9oif6e8nj i:mg k7 nd/at 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 kind of f ;sxsa8rq5( pchange on the induce5fs axp( rs;q8d $emf$, 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 magn y do.s cys7e9 3c+j3pn/+f 9rdwzu-usetic field through a loop of wire produces what kind of change oncedsp n3z +jusdo 3-uc9yr.+ /ys9wf7 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 nx,c;u:ynem4+ fffw1 a loop of wire produces what kind of change on the inducee;4 :f fy+nx1mwfcun, d $emf$, 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 removedbmub,94i4(kr wo -/1sl xbbqb 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 currec 9w)f9sc6n z9)alekcnt in a conductor will be that which tends to produces6cn9))lzf 9 wckc9ae which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar mag+rvzsc8 iabn-ah .2 kd7.3* yed/swidnet is held above its center with its north pole pointing down. The statisyk i/ na*a3.+cv iwd.r8b d sd2he-7zonary 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 horg- ,jnxc*fxgpvm;we 2 28)oavizontal table. A bar magnet is held above its center with its north polj p2)w8eoxafng *x 2cm;gv- ,ve pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the * h:3pranx1wl ;t1aie magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed fna1w:x1 ;hia3lretp *rom above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic fiel 5a ,;j yt2-/*agkv zth4p8bla vojzaz. -wb/kd vector points straight up. The magnetic field suddenly grows stron/.jz8pyv2v ; zwkzg/-t,o4baa* akabjt-h5 lger. 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 wheuc l j)v2vffwi i8o8) fyz/l-*re the magnetic field points straight down. The magnetic field disappears sw y o2vl/v *ufif)c8z8fj)i- luddenly. 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 horizonts:(sksjai (owl)( 0jk /3d tpdal table and carries an ever-increasing currentk0(j( : k/i d(os)3lpsw dtsaj northward. Two coils of 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 wipr :s) deh+x +qulx.(are with the north pole entering first. As the north pole enters the wire, the induced curre+ dhxlu:qpax e).( +srnt 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 azv0 k-c4;yvch xis whose direction can be varied. In a region where a uniform magnetic field points straight down, what muyzk4hvv;- c0cst 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 angularrz(-4wu u8y qp 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(u4u8qz-wy pr '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. p sts*afv6cl895gct2jkxv 6,
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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 th vvj fmkn v/z+x+kbh*8/)l1 toat 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 mactyjw 38qpgj;mdrie)65; oy6 gnetic 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 direction) is moved northwxae c/1btc94 ccnz:/vard at constant veloc enac14/:bcc/9 cxzv tity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant a5oydtp5 /,/tj sv20(rgle 6gz z5:lfqzg nmj7 ngular 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 tota4 d eak1:wr; -xzvvda, 7o-ransforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotatq5)om(p4b2u s3 1-kzaznh opoes through 60 revolutions each second. The frequency of tzp4naqm2)s 5uo(ph zb13k-oo he $emf$ 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 devicgl f;n q-.7pkpe 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 device th2sdhx4 7rl by74 0wprdat

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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 contains more loops than the pri sqgb+(f;t e3 of96kz m3b1ranmary coi1nbtq(o9rbm+ fk3s ef;g 3z6al then it 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 than the secondaryp 4i,,5ny)fps k t av q49:gukn/um1io coil then it ipi9: u s i)fqmovptg k4nu,naky/154,s a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power i.sw*) e+juhkinput

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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 circui2flte g76a0pvv m 8aj3t,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in ser9znye3f h)lu4 )kxey9 ies to an ideal battery of constant terminal voltage. At th9 3 y4ulnezxe)f)9kyhe moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected .7qhs 1p)7zjxxraapppj4 n 15:(du tdin series to an ideal battery of constant terminal voltage. At the moment con(rpsuhnda1 x71t.p dx 7 p:)54j aqjzptact 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 p,cm5bq(m )y,k v xrc6resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R isku6 hg+j(cpl- :bz15bm/m5utn ov;ds connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time const429akkxlk 0zmant for the circuit represents the time requl9xkz mk4k20 aired 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 connec5e.k(e*p rht jm5j feq +p-8x-h+eu xmted in series to a battery. The battery is suddenly removed from the circuit. Thejtmx8fpqhkme5-exe+- eph uj +. (r5 * 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 unit .nn,qy26ewuz ns,daa or(:i(s 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 tnqzl 1-yozo8 .3 lilra 1 u-dx0igk;i3o an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connegt , y*vis)jcs1/w,e*l s vfd-cted to an AC power supply. In this circuit, the currenjc1-s)/*el,d gfiy s,sv*twvt

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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 whem e.so+aq31ten the frequency is tripled? te3m+oa qe.1s

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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 abdr87c) b5m 2luc-w cbd0 e-pen inductor is doubled, the inductive reactance of that bc bcu2-r c0be-mw8)d7eld5pinductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor appz x pi;cq .d 3ffvr):q0lwdw 3h;5obp9roaches zero, the inductive reactance of 3vqq z:d9brp 3f 0oc;w5wl; xf)ihd.p 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 pbc +6ut jf65 h,xxpkr2-kr0 hthis circuit, the currenc hkrjpx -u+,65fhx pktr2b 06t

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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 factor wj(c *l.k:gloycs2c; h hen the frequency is tripll s ch2yogcj;c(. *kl:ed?

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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 voltazrw x+pp,h9h1ge across a capacitor approaches zero, the capacitive reactanprzp,1h 9+wxh ce of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitorhs5(,wj kmpoe;payl ltd 2,n +09dr4n in a RLC sm0lksdd(y ,h4n2 pl95t;now +p e,jareries 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 den c 2ip1-g p ,o,jgzspj2f a3ppm74-qqfined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of k+cd lql ran*wir2/; 9the circuit increases if R increases. Whe29wqdarcnri l;k+/l*n 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 inc2d.*)+y0vfb e2vuzxpr (uhqa reases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circutb4e 5 edz:k11 .nrha7u 2wvviit 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 double in an LRC ser 8u a2 11uqbqdtc9ex3sies circuit, the resonant frequency of t9us3cx qqba 81e2t d1uhat 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 d9mhnx ,phmr0:riven by an 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 circu wag4ksoar9o. 1sd7z;it 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 rq)c5lt( /vh(o5tmpg u9.j m n .soatl1adius 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 lop ( .9vng .tjl 551alch usq/to(mmt)oop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform mm .1pruf18 1r a hz5dj0l6ol 1yrqgcp(agnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field(.qm1gyrr p8 h0lzj6u1rcla 1 fdop15 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 magnetic field v4c)q3o dzbsziy)tf :9gq8 2sof 0.20 T. Find the magnetic flux through the loop when the plane of the looq osb9gi dyf3:)cs 8vt4z)2 qzp and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable singl4aalk +,mmd6 +5lv. hlpbbx p e/.q1aae 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 coi0fu h i2,j ide +yx(u*l,sy6hwl 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 3 tdi/fjn)t529 nrghh1bmu *s turns of wire on a square frame with sides 18 cm. A uniform magnetic field1tgr/5)nu* 3 it 29dhjhsmbnf 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 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,p,zzbbp6rfw;z 7bt 4 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 imw;7+g w4az q:y1ahdarea $0.20 \; m^{2}$ 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 mu8/) xl6cq645adkpe/ dvfqbj zfyrf j9y(b4 , flies horizontally at a location where the downward component oeclj jfq rxfd45/6z8,6u9d/y qfab( ybvpk)4f 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 barn,7c:g 6ibcz6 7 msagv that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its en,is:7m7z a6gnb6 c gvcds 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 0(lv.fjxnewpxu:a1 , has 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists l3.nf*kgecnk 5,i+b2 sx 6lhe of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectan j br; sake+s,-m;h.cpgular 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 iks.cehj+ ,;s;pram-b n 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 of24 gm(6./am dkzqi- c9rjhthi 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 generator cuu52shn px,abs3*)5 pko+ ar with an output of 12 V maximum when rotated at 60 Hz. A mag, a25hua+)crsnppus3kbo5* x netic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a 1n6fmx7bv t6fmaximum $emf$ 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 9f4y-qgg310o laoeuf 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 resistan 1f7t+bs3utlth2 1x qpce of 6.00 W. The motor operates on 120 V AC, anx1st32 ph+ 7but1tfq ld when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power- xcb6 *)g 0zgjw1ltey*2vrtz fcok53 supply. The operating current is 1.0 A. What is the start-up cuz rk)w3*5c evco2l 6gx*jztt g-yb 0f1rrent?

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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 re1o1p:okdqw9+jv :x tr sistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What 191:r o p+kv:otxqjwdis the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to0kkvxk g0f3b30l;5 lkfz vl3z a 24-V power supply. The operating curre3l v5f0 ;0kbz 3kxlvkg 30zlkfnt 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 primary voltage ii5 -n4 fk2pwpof $120 \; V$ 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 aai9oh3 +0t f,yz/ jjbuaa f;)u transformer causes 14 A to flow in the secondary. How maf+u)j 0a9yj /;zb3,hu taof iany 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 necessaryzs 7 m6op 6ymavo(,m:u in a 110-V primary if the 24-V secondary has 7 os p(,yoazm:m6m6v u100 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-t+p;rgoxbek62 qi/2 * f+uagg surn primary coil and a 2000-turn secondary coil. If the currentixo2s6*akge gq/gb+2r+fup ; 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 primary of a transformer. Assuming 100% efficiency gq -)vrdo/y wctj-udg*x38.l, how many amps at 24 V can g8u -l-jtd3*y)qd o.wv/cgrx 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 providekfods8*7z : hv6gh:kvs 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the :z:h *v7sod vk g68hkfprimary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformerhzpjwm ty (ru k;*x/*; b i8b9t6)envo has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is appliedz bib/vkwun**)oeym 8;hp9(6 ttr;x j 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 its3:bd 1 tjme.ux secondary coimu de3t1x.:jb l. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer ha23 n:am9ekcg es 100 turns and its secondary has 200 turns. If the input current at2e93e kcnag m: the 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 transforme7w)zr la/nvlx,4ht 6 wr has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the ounww ) v67l4 /r,hxltzatput 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 ezzlpj(g w1+jcg5* va0q/ :ze turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting fgej0q: 1wj(azez *vlc+/ gp5zrictional 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 v q*5,8 vj26/ghtb m drikv j.7gefpuy:oltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resist7*k,h68gyjq2/ ev t. :ijp5vfudrbm gance 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 120ew6xk (cr y99b V. The voltage is usually stepped up to 4500 V by a transfor ckx eb9(wr6y9mer 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 c oia;3-2wra:a rd7mdre(vv8 uurrent at 120 V. The voltage is usually 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 transmission line aw-8emv( drd a r3o2r:u ;av7iif 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 vnm.5+j-d.pczkhyq ghp1 1 o4km 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 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+gpzc5n1yo .hhpvmjq-1.k 4 d?

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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 resis;gbq-ky;( x;g qyi7hetance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer i gx(gqbk 7;qh ye;;-yis 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 liney. tm4du.r)na9 jbeg9 )sepe* at 1000 V. How much less power would be lost if the power were transmittedndey )u*spb4em9 ra)et9..gj at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmittedwarr8 l(9;gs/y8+ (shtz)lzz ag4 lfv on a line with resistance of 0.60 W. To what voltage must the generator output be s zsg;g+( 9z (ar8tll4vl )wahzr/sfy8tepped 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 stored in thep6y.gmdn85f 4sij ex : coil's magnetjn smx6 5gyfd4:iep8.ic 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 containsqu2qqq.f90sn m+ta j 2 a 6.0-W resistor and an 18-H inductor. What is this circuit's time coqjqf q 2+atm9 u.sq20nnstant?

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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 thel-s7eime4x(* dvt 0 84ngup6slgby )k rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak currentaefxiy-ag a 8g/lg-g /n6 t9;62qijjy ?

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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 9h y4i,u*8glr /dykr pa 120-V AC outlet. What is the resistance of the la r ud*krghp49,i/lyy8 mp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peak c(rmetq.q 69fqov u- bjky.(aira;1:-ombg i1 urrent through the rab6merqkibgo9;j(-:vfo .y1imq. qrat(- u1esistor?

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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 powe.gu*j8 :+ k9z 5jxs ggb5mbarer supply. What is the power dissipated in thexg:gbez+u5*8s5 jrj .a 9mgkb 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 resistorlsd;aq)s v l38 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 resistor.kftj 4q 8h)zl2 id+7snxnv(c 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 resiwlpk+ +redph -t z)ou;.81 fnqstor 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 inductotw it*v; n1p8er 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 reactancep)go5-nwvgo87dmm k41 ql dq 7 of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 10-kxuet3 dw) g4.0 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 Wnr3;0 (ocm mjt 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 wutb0ebh2-fn)e a j0jn 6raz)1hen 120 V AC at a frequency of 20 kHz is appliedt0erb1bnz nae6)-02ujj a)hf 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 110-V,vy99e- 4r/t.opno b hf 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitoe*k-nidc9 w:l-. q wlir 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 at 106djp c0badvhk+;5v1zq*mne5tu 7/ oj 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 reactand68oqbw p4e/t :qvw-mce 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 capacga)xa p6 w73klitor be 100 W?) a67g kxw3apl

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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 .yd-4o xq7-w8nzh htvat 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit wit nzl jhx9ge*doheqss3 u6-5 /3h 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacolu-39nh6gde/3 zqxssh*j e5itive 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-md m ghq0rfo9e8 )2*spdH coil, and 1.0-mF capacitodrqs82m)g dop9eh *0fr 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 angleykdc8a*a c7 l2m8 r /f38cloig at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriesmdiyr8 /7 ll8fokac8gc2a*c3?

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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 seri 8zkzmd3l +q+lw 3 qu1x2tk8vhqez6*tes with a 20-mH inductor, what is the impedance at 1000 Hz8 h*u 2 m vt+k31+lzez8qq3lx6wtz kdq?

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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 co;n9nb n9h )4dml kxsf9b nw9)xicoy 6nr8;u7knnected in series with a 20-mH inductor, what is the phynh9kb9 c) 6)d9obxnxknsfi9 7;nu w4 8;rlmnase angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is nee45( uuyi c)ppp/hcg)z :+imbw ded in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 )c: / c b4imy)pu5wphp+zu(ig 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 followi74u--qaa vef d(v-gging capacitances is needed in series with a 100-W resistor and 15-mH coilevai(u-4d-- f7 v gqag to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 4b ef ::3uma frjw;fg1Hz for a total impedance of 400fa:jwf rme3f:b4 1;ug 00 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)x 2cbh1e eamm v09*ms with a 100-kW resistor at 1.0-MHz for a total impex 02mvhs e)mbce *1a9mdance 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-mF capacitor. What is the impe,l yxh6zb4 )a:i,x *lkgwmwga;,puh, k :ipo:dance at 100ok,ya)wxxpk:; 4zh,i b6l,g: pha:wul ,m * gi0 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 capacitorlbr9p;gs64.d57v ecxg+m9e/cgx y9a*rksd e at 1.0 kHz for a total impedance of 45ekx;cve9ps+xa l d /5s 794gdr*mb9ec.6ygrg 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 wij.97 klgiq4cr th a 10-mF capacitor at 1.0 kHz for a phase anglql. k79cj4rgi e 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 a-e kf3ndm.npdo4 g7n; total impedance ngo.d e;n-4md7p3n fk of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. Whatf2wd.hfhp2; lt5cw r6 is the phase angld2flwh5.f2 thpcr6;w e?

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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 a 100-W resistor, 20-mH coil, andm yt)xd45) 8uyapukz6 1.0-mk ud6yma 8)zy)u5 tx4pF capacitor 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 100i slu);+:xj6,ueqe qi -W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power suppl+uj,;l6u s eqe:)x qiiy. 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 W7 r+gq.5il9k4sbckgg , a capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz pos5 ig+. k94kgrg7cqbl wer source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a seriekel w58 kl8saia 2hp6/s RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductors 8l/85 al6pkkwi a2he, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a,kvq(jtw ,u .k 500-W resistor for a phase angle okjq,vk,( .wu tf $40^{\circ}$ 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 = 670w g fxv htepn4t5p)200-mH, C = 10.0 mF. At what frequency should the circuit be drivent4vhn ewt6f0 g)5p7px 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 oq him+5a ,m4eresistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connecihma+em ,q54oted 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 ACqtl6l7k ayt/)5 -puiv circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30amo4p/-y 8i4yf64l 4kqacyxu W. What is8/4 -l4yi qfa c4y ypx64kuoam the power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W re 4upo7u6 ihi(+k)w: mvexk7jb7q7 lissistor, a 10-sh:6i muw 77lek+bxi7p)o jk4iuvq( 7 mF capacitor, 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 15nr. 05y co4drn-mH coil in series?0 ndcn.r4ryo5

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resond6llvf,vos0o/ w s i4lzo) 05uant frequency of 10 kHz?0sl ,v ol5 /d)oi4zsl6u v0wfo

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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 resonant f l-io3o so46rwp6 qrl(requency rrq6 i3w(ops4o6o -llof 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistw( c4nvh6-z d befc19xor and a 40-mH coil if the resonant frequenchcb4v(6d1x-9cznf w e y of the circuit is to be 1000 Hz?

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