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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 ex f4 iixwmjno20 bcawocl-8 9p .(c17rucept

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that theeb( s+h68 wjt/szkb kqlhppgh0g23. 4 $emf$ 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 kint3p)(ahm k v72ot/t5 rk cyb7kd of change on the induced kvph(bkc5y r)3ktma 77/ 2t to$emf$, 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 l hp4 wid-7:es kvq5p:o-fp0y x)(fussoop of wire produces what kind of change o:qh7(i e xfs5s4p 0kf: )p-oudwpv-sy n the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loopgt,jym qm21*e cxs2-t r-c7pm of wire produces what kind of change on the indu q-t2tj1e*x7ympmrs -2mgc c,ced $emf$, 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 f* d/84qiuww darom 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 direct4ma: rv w lp4+masoy/smpk8: 4ion of an induced current in a conductor will be that which tends to4oyvmpms/ w8lr m+:4ap4ask: produce 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 flatw4ie-/* nmvr x on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (whr mx/4*eiw nv-en 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 ;kb 9bnxj -),3hc vrslbar magnet is held above its center with its north pole pointing down, and l9bjkr,v;)cx nhbs3-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 tombh ice2,2gmf/ 9h8w ip in a region where the magnetic field vector points straight up. The e/i bm28m, 2c9iwghf hmagnetic field vanishes suddenly. When viewed 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 level table top in i)/h4mbb veo 7a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current e b/bmvi) o7h4in 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 magnetic hso,e6.5hk op orqp 2kai7+r4field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced o.ik 4q shr 7aokep, 2ohp6r5+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-incw 21vxr* mdhcm3uq 9y8reasing current northward. Two cx2m3h8m19*qwyvd cur oils 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 throtjorkb;be,y mau4- 30ugh a loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed fromjkuy 40,o-bm terb3;a 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 angu3t( uza*v0k xmlar 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 loo(a0* tzx3v umkp'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 jh7a0tensu(ia/ ,on+:vb p1m an axis whose direction can be varied. In a region where a uniform magnetic field points strabai,smea vhjnu /t0 p7 o(+n:1ight 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.3t 1o j5ya ,w(fgd6bfd
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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 thavl-ki() jnm3 kvdc6;k t 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 magnetic4p622(jef:sc +qeu hzh ;nxxp 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 (oriente/ v* 8xt o5ity1d:hgbet7j c5fd in the east-west direction) is moved northward at cons5gdec /x: 571ojvft* i b8hytttant velocity 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 cooi79t,6 sh(q z+aq/dn.wo agwnstant 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 transform + )5gbuhzgj-cs

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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 wxoyi kenf45(jf/5 )ueach second. The frequency of tny/5jki ux) f54of(we 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 device used wx *+s5; e51niqi9- mbjf8tc j.lqzg zto

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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 deviog.r ma+0y7ynce 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 thdipxxjowv103k3e 4vy( sk 6,m5zl ;oue secondary coil contains more loops than the primary coil then it is s6 ei,v x3o4duj;zkxp3v(w01lkym5o 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 prq5.s1+wgz i c mwkhq-tszq8+iu ju)cv-z0g()imary coil contains more loops than the secondary coil then it i)0 +i. qg hg zvz-(ziqt mjsu)ks81w-u5+cwqcs 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 inputjzdhafegor59/+e, * l

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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 c9qhq m3j;b*lk1hyvc */ pwxe4ircuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of consta6bz *8f9:bdf uzfrwr7nt terminal voltage. At*rrwzb9 z6bf7f d8u:f the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an iz 9+(.f0ouskxqq ehl23cv *czdeal battery of constant terminal voltage. At tf+l q.0hvcouk3eqs2z*c (9xzhe 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 resistf. xejoe s..rxu,z0 )9jbd,5sa 3*w+llakcja ance 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 resistatv /7t 9gmix wg-k y.tp66gsl*nce R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a b5y2pcx ny nm6u r-s1r)attery. The time constant for the circuit representssxmyupc61n- ) 2r5 ryn the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in seffn,6 w2ifbxat74gz 8ries to a battery. The battery is suddenly removed from the circu4biffn,w zg7x86f2ta it. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units exn d h (6.oj)qkc,x)b xbm(zy supd5(6ncept:

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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 e+.go d4 .cgm0si dw,a-w7nd nee59qathis 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 connec9t;qo lsz(u8lted to an AC power supply. In this circuit, the curren; 89qlou l(sztt

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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 fac8t+)rv ; lkysoqh0j .7eujcj 5tor when the frequencyjuy)k rh q.08 jl5cj+;es o7vt 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 acr-x:d+avmw1 tmoss an inductor is doubled, the inductive reac mawd+vx:m-1ttance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC q5 ben)ya.18p;tenm nvoltage across an inductor approaches zero, the inductive reactance 8betmn qn)pn;5e.ay1of 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.nmau. wh1n-a) In this circuit, the currehuaw-1 a)nm. nnt

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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 whenzg0nkofp-y9e e+p /)w the frequency i/y9oep+z epk f-)0ngws tripled?

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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 approachudf(x7) sllh2k lt )s2es zero, the capacitive reactance of xdhs 2) s)luf 7l2lk(tthat 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 capacito20ri 3qwmnj;u r in a 23qim;0rn ujwRLC 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 R)uo4xq*x*z:d wa)h ilk (rtfuh ..7z nLC 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. The impeda31s)/i nhwkq gjps4) tnce of the circuit increases if R increases. When is this jht3s4 kwg/n )) si1pqstatement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if ly*-. khgx(p2zm1viw $X_L$ 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 ci-a/m titi:cvrn, k)p-rcuit. 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 cadi)wnj8- :vwnw)i5p q pacitance both double in an LRC series circuit, the resonant frequen)q ni8)w: -i5pndjwvwcy of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. Arh;,xo5pz hb/t 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 serie nr; -b:e/yuuqs RLC circuit 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 0.10w x2d*wmt 8)q suvc*a7 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when th27s8d)mq xwavt *w* uce plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fifsef 8 wzz;u8o(vm obc/;il1 8eld of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vecto1;ff;cbelvoo8 (8m zu wzs8/ir 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 fieldjw t)z 4v i+a/gah::nv of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are:w/)a n: g a4vzhti+vj 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 sinr eb)oy33c:+ avbhr jgjf)o,- gle 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 nsvb.,+5 eujuh*zn ,kchanges 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 wire on a square (k b;b vykwh7:: s3r86os jbinframe with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes unifo:;bkr(n b v:7b8osw h3jyi6skrmly 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 x/;lmgnt8*c; 8 jujfe with 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and area9(.o wudj wfy1g *yj4t $0.20 \; m^{2}$ 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 h8eaer bqncm fd4b*u x1 kog;9 x9)d1p*orizontally at a location where the downward component of the E)9* nr11dx de* mauk4 9b f8b;opecqgxarth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m 8tmeil z,e wtg96yiuf6: 3azm4r;7yy-vls / elong rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetictewgzltl8/sy a 3zi-m yi4ef 6;96yv :7eur,m field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectiona gl+wy 9c6sx.el 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 ya08 ayo)00ew*jizbtturns 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 rectangular loops on ay3t jb8x-t dnjr8 z(0its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will ber(n803b8jt-x tzjyad 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 0 hc(t;kh c q54mzmd,jof 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 agw06ksk5x6qw simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is avai 6x6gs 5wqw0kklable. 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 generw.9se4u+q xrn-2t*nr u ty(wcator 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 resi/ugmqhn(m97 xoo5 n4 astance 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 md nepbxr ssf2*1hv862otor operates on 120 V AC,12 s2 xdpfn8r6vehs*b 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 resi-+ra dy+9 cqmcstance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is t9rycamd++c- q he start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connkf c58.b/oqpnected to a 24-V power supply. The operating current is 1.0 A at full speed. What is 8c nfkbq5 o/p.the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to*g)6 h 7aj+se 1tt hcxs10ftfb a 24-V power supply. The operating current is 1.0 A at full speed. What is the bxb*esttg0h7 fhj ac1)ft+6s 1 ack $emf$ 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 ij/ pobi.1 -qvgs needed to reduce a primary 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 tjlb+y6,o o5-, dzgg -oywq:k hransformer causes 14 A to flow in the secondary. How many turns are in the secoh -g:o ,6y5odly-wog+b,q kjzndary?

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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 manyz/ p7;lhzan 4 xpn);zc turns are necessary in a 110-V primary if the 24-V secondary has 100 t/4pn ;zlxp7z c;a)zhn urns?

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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 pj9ir -f k kgjn-c(s jn/hk,9d(rimary coil and a 2000-turn secondary coil. If the currik,s jkg 9r( n(/kj9d--cfnjhent 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 trans2vv 5l/vd*st 27mmegp 1q8 estformer. Assuming 100% efficiency, how 8/vt5 vdsltgm72me2 e*vpsq1 many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7 ypf0t-ct (fm2500 V at 10.0 mA. The primary cmpf2-yt ft (c0oil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil poe wu88j10iptp )m2 band 300 turns on its secondary coil. If 120 V at 2.0 i 0p)ou jt8b pwp81me2A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turn h4:6jwleogx )s on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied tj4hwoxg:le) 6o 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 hasg6so8(7r nzh::df klw 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can exps6(nl 7 howg dkz::r8fect 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 acqf121 zb pzzag -uv7;nd its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the outpu uz11bvc7azfq ; pg-z2t 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 second5jx)(n o uk8kgary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary k)k85jnx o (guto be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage,eg4e 2p qcvbx841g xy(ev (yz is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the numbecp8e4 xyy((4,2eqx1 evgb gv zr of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually step r6eqk) mul9w/q e7xm+ped up to 45q e7/ xmu+em69rw)klq00 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 currewa(; eiz: 4b(k8xge j3 peas5te/ow- knt at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of to-xw( ea e;e8tsw zi(bg:4jkoe3kap /5tal 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 re6v0vm : uh2hvnsistance of 0.60 W. A generator :vuv nhv6h0m2produces 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?

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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 resistio1d euuc;59x-3xknr;pj5vd ance of 0.60 W. A generator produces 100 V at 70 A. I9kj35v i1dnp eu ;drx 5-x;ocun 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 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 1000 Vk9ug;wz,pqs: z,gu 2 k. How much less power would be lost if the power were transmitted at ;,kpuuwz q:9s k2zgg,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 gener onw3*1w as-fhj fd)b:ator is 440 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 tr3wbafn -o1wjdhf:s)*ansformer 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 thy nkgvz6s:az:k b(or 5.l4s9ne coil's magnetic fienro g: v5 zyb6s(:nk k9za4.lsld?

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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 ind ipe;rid9/q5ppem,e 1 uctor. What is this circuit's time constane e 1;e5ipir/ 9pdq,mpt?

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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 );6*48xyvc :jaijhkxslsl3wu 4 z hf1 where the 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-Vch;,b (:ifyz w AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed)m 90zdx uvoy. into a 120-V AC outlet. What is the resistance of the lampy0ox zv.9udm)?

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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 powe9zfk8c a1oi)tuns2n( r supply. What is the peak current()nfk na1o29uczs i8t through 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 coi5h h k3k4.ctrnnected to a 120-V ac power supply. What is the power dissipated in the res.4ht h k5kcir3istor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor hf lsp)kgaby895m3.xis $I = 0.80 \sin (240 t)$. 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 fmx .a-vg-ocv b1ru)(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 50-5c*s 9f c9vsv:z1 wqlxW 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 htbdm 52/k0lrof 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 coil xwx+ln0voyaq)k78der* e 6* 8 ofj+yl 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 reactap6ueb up,h3fwmy:-tse,b6f :c;4krm nce?

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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 inducti / egz br mn7fafk85fm5,ycp;f:3exm7ve 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 bexxdc:rfsn jc1eoqh0 0 6-8-when 120 V AC at a frequency of 20 kHz is appli- ndc ox1b0r hs-6ef:80jqxceed 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, 6,za:a5punk rf466gy m 3lx ;,gs g(mdk0.0 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 capacitor at 10 0lpy:umog1j 1;cf 3 kl3:ezd xkHz?

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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 bmj4n1*5 8jdz fan7p1z-xbis 2icbd 9 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 reactance of 1200 2bxgva2*sl)volm1q4 kv( av 6W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency winovctx3i,f 2 o-i)g3qll the capacitive reactance of a 0.010-mF capacitor be 100 W?ic,xt)i qog3onv-f 32

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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 ca,s jr p5/it,pdpacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resissfcntg 4- gq28tance, 15.0 W inductive reactance, and 10.0 W capacitive reactance?qsc8 -fn4g tg2

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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 1.0-z 2sg3qp+qm dng 3u;8kmF capaci;s2 du+38gqkg mn3qpztor 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 1500can y kna/v9 8 d*v-0yl76mreaurf1m: Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor ar7nca0 r8dmr/ f-a1*:n l6yvemu vka9ye 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 insot-wu)o -u9c m88ljat)jse . series with a 20-mH inductor, what is the impedancuja jt)tuw98clesom8 s- o.)- e 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 wi7, z,n mu/242bwx jvzndb:y rzth a 20-mH inductor, what is the phase angle at 1000 Hzunzmw:b2 njvz /,b,d z2ryx4 7?

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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 20-mH cntcj6t:db wzk wxt/0; * ;/ff)u5ikol oil and 1.0-mF capacitor for a total impedat;t k:wju/6 n*czlkt05wb f )i;ofxd/nce of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series witun 68 6tdzeohj zne;42h a 100-W resistor and 15-mH coil to get a total impedance of 110 ;z8n6 o dunezhj 6t4e2W 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 be94 .wtmvueo)4a dugf hi23 ;uw put in series with a 450-mH inductor at 5000 Hz for a total impedance of 40000 . gv;ew4u) ud2ou m34fhwta9iW?

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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 rj f) zf is lmn*j,ca73u.l5s/total impedance of 17)al3ui5 *zs .jrf js/cmnfl ,50 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 im-57rh9we t9ee21o0j 2m/j tmwr udi znpedance at ou9 z7-9 tthdr w jjr2emw02n51i/e em1000 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 serie+d.usqg.r/h f s with a 10-mF capacitor at 1.0 kHz for a totah.fsu/r + gdq.l impedance 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 apdz jwm 2(3dv9osq6 +n 10-mF capacitor at 1.0 kHz for a phase ( vq+2 ndowsdm6z9j p3angle 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 o j8xh4.usl,9yyh ,cz in series with a 30-W resistor at 1.0 kHz for a total impedancexyushch4yj 98z lo,., 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 capacitml79ip vys7kmkt* m1 2or at 120 Hz. What is the phase a1t27 *79 kmvyspmlk mingle?

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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 f yn3 *ilapi1m:7hgc7 f3glb:.3 muprcoil, and 1.0-mF capacitor f:: bu llm g y.73a3pr7g3ci*mfpi1hnare connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mmg-*x 5erpq i8F capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms currgxpqrm 8e-*5 ient 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 drfqv2/ c6b/ bcxt/e+an inductor o/rvb/6+c2 x qbec/ ftdf inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit cong4zlh y p+5w5rft-8kktaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inw5g- t8+kz5 lrky fhp4ductor, 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 500-W resistor for a d7f- dr5t :d rtls7sd+ jrc1z11 a ,r-imif5dyphase angle of-zar 7mtrs:1dyj s5 td17rd+-drf 1,liidc5f $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF 4 ubymb8mnh xu4bjbin;m414 3. At what frequency should the circuit be driven in order to have maxi44n ;4 3uim1ym4hx8bunbbmjbmum 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 cirhc-3jb7eukq9 u9imp 4 cuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reacteujk -3q4hb 9 u7mipc9ance, 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 A)um4 o8: reyttC 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 impeda .3dw)twkp.y ihg25xcnce of 60 W and a resistance of 30 W. What is the poww )ck y2p5tig.h3.wdxer 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 factovqrk1j8r9, .1ft t cxrr for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power s 9rtt1 , kx.8rvj1rqcfupply?

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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 capacitokrxyr98gc 4b6 r and a 15-mH coil in series?x8ky9bgr 4c6 r

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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 c8 fk:yr3jwnum(ey2 8l y0sr7wapacitor for a resonant frequency ofyj7n 88w2url0 wef3 :yy sr(km 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 3.7-mH inductor fo *uo nmo+ph,l /(r3ytwr a resonant frequency of 1000 lh(*r o o+pt/ ynmu3,wHz?

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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 witg) 4el: b:dbds7l7nb th a 30-W resistor and a 40-mH coil if the resonant frequency o4:)s b ld engl7db:b7tf the circuit is to be 1000 Hz?

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