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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 magnetic flux e..e) s1zwqan7db uu b6xcept

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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 inductionn9sx*kr* ee6ab;d) r9b.bvhi states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of chwo g7r wnap ,wolcr6,xi3 v;;2ange on the i6 rlwo2ovcx7 ,3,;girp n;awwnduced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire producegu;sy8* q. 4gtplg,k ls what kind of change on the inducedq*yt,u g;gsklp8 l 4.g $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces 2ib gb)k8 ligc (*utnfw(8yt +what kind of change on the induced (ib2+t8 gcb8twyfu )ln ik(* g$emf$, 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 fromdshdm.8i( z 9k 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 curren zta57sb4 ,w08nco fa ;c 9k.ijx(tfyet in a conductor will be that wtax5c7(ais,0cnjt9oefkb8y wzf.4; hich tends to 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 flat on a horizontal table. A bar magnet is held above jchi*wxd)./c ;l / cxmits center with its north pole pointing down. The stationary magd c*;/ wxl .mjxcc)/ihnet 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 liesa;qpz0sbn;4 dk p3h x. flat on a horizontal table. A bar magnet is held above its center with its northnh xzbp;43ps0a dq ;.k pole 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 i 0c7ec16umrghs)q,w2 sw9fwu n a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the iw0 12796w guwcscurf)mhq e ,snduced 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 fi)s9ojdwb3mat;/ p y6qr6 mg,ifr(x6w eld vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what i qamgwo ;)dt6j9b(w,6ps63/x rmrfyis 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 inrwi3j9dbo:aba;wgp su gq0iv chs9. f*a, ( 59 a region where the magnetic field points straight down. The magnetic field disappear:dhjb5i.aa g *gwifc90av 3qp;9(os ,bsu 9 wrs suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasi ia 728pk*g y0yc+quubng current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from ai7a+0cqbgp 8*y yu 2ukbove, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with t n:l 21bg k wyyirqlev9d l;:q/a37,zrhe north pole entering first. As the north pole enters the wire, the induced current will bev:qqwbkr:g9arlid71l3e ; y/ n,2yz l (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 3kq( c:anok. gis rotated at constant angular speed about an axis whose directo .n( akc3g:qkion can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation 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 sp0gr2elk q+ 37 bov+wljeed about an axis whose direction can be varied. In a region where a uniform magnetic field po0r3ekv l+ w+j7bgoq2lints straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.q.a1ry ;eh1s y
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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 y,s5wr hb3;is that an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic (w: vcq 0/hen zn /3d0i3huhdnfield. 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 (orie1xi klgv.9 r8nnted in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerkl.vi1n 98xrg ning 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 consta e vbr1c2ftbgg/.kq20nt 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 transfog, sk 2jt)gi)ib wu+z8rms

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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 eachl2ivi(a8x )7ld y, lze second. The frequency of te2lzy 7 va)8il ,(ixdlhe $emf$ 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 devyq8b (t +yks+5um dc-dy )nh:zice 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 devo +g4*v 7ufvcwice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the prima-l/l3o8y2bpw6u mfjo ry coil the 6/2pfl-l3 u8wjbomoyn 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 k yocx46 d9usvu( 5a.mz *,oxxprimary coil contains more loops than the secondary coil then it 5cx9*kuy zo6.d ,v4 (smauoxxis 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 inp,f,ip0uzvd* c/n quk9 ut

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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 c05 gbri8*v i;rejbk*xu-7e uq ircuit,

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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 ideal3 yl *do6mwh8u battery of constant terminal vol8w dy* omu3h6ltage. At 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 ideal batterykqx4clw x+d*/9iisi / of constant terminal voltage. At the moment contact is made with the battery, the voltage acros wk/li /x+d*4cq9x iiss 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 bcg c;gf czm: 7w+j-(-ajjv. ;0jhfblinductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the 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 andw+o07f2z9fle9vk3+2zv+doua l bpxdott q3 5 resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in s-yz4d iv:2 v* epocs8leries to a battery. The time constant for the circuit represents the time required for the currentce 4l2:idozs v vy*8p- 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 con p jas;cxz9)k(nected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the ck j;psc)zax( 9ircuit 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 followingrs vqo 0o+.si-y9,oxh have the 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 this circuit, the cur9kuq4 lju(yp 4rent

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC nsed6;g4e)g. +-nhlan w ,vup,yd3y lpower supply. In this circuit, the currentawhds;lny-e pl6,+gnyd3n4, )u v.ge

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance inx6 0nhp95ak ae an ac circuit changes by what factor when the frequencyh0 9exnapa6k 5 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,oi5v,q wd4n4xpogq ew3 1sl+ voltage across an inductor is doubled, the inductive reactance of that inducs +lq5q dx3gwe,44ovn ,ow1p itor

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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 approaches zergv/mby 9o8fj7my9u3d zf 7h/ no, the inductive reactz of/njdm9bhm7973 gyuyv/8 fance 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 supplf 4o4g eyuxj/w3*g 4ry0r b2sty. In this circuit, the curren3 *ytes/24g jwrfg yrxo440 but

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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 whenbo*d9j 3yi1wnmt6cd n48pyw/ the frequency i y6jny *t38p9dnw4owb dm 1ci/s 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 vx4obi3e:c3 x e7sdf. qoltage across a capacitor approaches zero, the capacitive reactance of .bfe 37dqcei o3xxs: 4that 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 c7m*0ws h;b0s s- lgunqapacitor in a RLC ser0-snm;b0g lshuw7 *qsies 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 Rhfaz(vz: .sr1s83mq*v; 3vt h lu3mtv LC 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 circ b2 -.+m(ifgfbo7gh cyuit. The impedance of the circuit increases if R increases. When ifgio .cgby7h+ fmb-2(s 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. The8nb8rj7 wcg*d )-tqmz impedance of the circuit increases 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 impedanceomx(jvbrh-( 8 ge;i:b 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 bod tjhh9*:rws )zlj g3r/8/s gzth double in an LRC series circuit, the resonant frequency of that circuij srhhz/)d/z9tw8g *grjl: s 3t 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.u*8a 7,bgn+l2gptl p*rq k ysz)r04l c 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 mbqp rn3s vt0cc*-/8na bv* luvj s*,-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 radni39 5-nxzcs8aid )tqius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane ixnazc)tni5s-q d39 8 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 radiu w4kvym2jb/5es 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through 2ye5/k bmwvj4 the loop when the plane of 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 rotatin,r (mef xlti/+g in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an ang( r/i,ml+etx fle 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 single loop is reduced(7swn y4uom+ hl275*y4maa3dx p brph 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 changes fromm vsl/b9(79 o7bmg vgu54/vrz 8fx pim $4.0 \times 10^{-5} \; Wb$ 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 witz *.zkmff ;wy,h 200 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the averagey;k, zfw.fm z* 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 aretsuldgj *. m- vz7+cuae (l.;ea 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 are:2gt7z f (s5uchoh, 7 kpu8bgza $0.20 \; m^{2}$ 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 h) o k2)y:;zykdzhl a rgx;k3/sorizontally at a location where the downward component of the Earth's magnetic field iky2gxk;o/3zhz r ;)lkd): say s $6.0 \times 10^{-5} \; T$. 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 thd q-4m9qddpuly :- jx1m,b3io8e.w h pat is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s abo-dmxppjy1 8eldb -,3u4.m9: dqwohiq ut a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a c 6lx-b3hxg hay1syhliu- w 0)1ross-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 3isk4(ruggq 7s x6x *aturns 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 its 2l. di3i st*bnarmature. Each loop is 12 cm long adti* sl bn.32ind 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 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 gji, z .kb) xv16t.ckhturns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator jnndooo( 330w * ipsb,with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.0j0ow npiosn3ob(3 d*,50 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 a3 sixspdw4nw;s6 4 9h utxof9p.oc;ut)t* ta; 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 resistance of 6.00 W. The motor operatesb10x t9n1xj(nu.hskw 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 resistao12lef8x(l 2pp7n,da rqwqc/ nce of 6.00 W. The motor operates on 120 V AC, and when running at full speecelf /owx np1 8(722alq qrp,dd 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 suppvy pgli0:iq) hjcs; n+ c-1cz(ly. The operating current is 1.0 A. What is the start-up 1hs)lqiigcv;+ cz-cp(nyj :0 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 resu1k.ois pyh7-istance 6.0 W is connected to a 24-V power supply. The operating curs ouy-7i.1kph rent is 1.0 A at full speed. What is 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 connectuie rhs8tesr): i -:rm.noyyz, 5(zxjh- v (u-ed to a 24-V power supply. The operating current is 1.0 A at full speed.snh j)o85yi ( xeu-(:i,r rseru .y:m-z-htvz 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 aigfajfvwgi;8 i gj*q57t( ko37cn8.g 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 ofp 3ga)x +-5ih oq8ndbq a transformer causes 14 A to flow in the secondary. How many turns are in the secqi)od3xqh+n5 8b -pgaondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primarxwz -ao75d6 sxy if the 24-V secondary has 100x x5zw-d 7aos6 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-t6h hh4u.ta ,thurn secondary coil. If the current in the secondary is 3.0 A, what iutthah .,h6h 4s 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 7skw26 h m*maoa transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the sec*kw6 ms72mh oaondary?

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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 750/nqs lkn)lh ;i5 x;,cx0 V at 10.0 mA. The primary coil ocnsi)qn 5l ;,/;lxx khperates 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 turnwb6jb6ugvk9 - s on its primary coil and 300 turns on its secondary coil. If 120u6j gv-b6b9k w V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer hy)i5q6jkb+ tl+ h+8tj(mseg bas 60 turns on its primary coil and 300 turns on its secondary coil. If 1 (gibm8 thkyel5+t )+js+bq j620 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 has 100 turns and its secondau3/ 5eqwrgcin3 + ou s)/lnf+mry has 200 turns. If the input current at the primary is 100 A, we can expecifg cmn )n+ qwlue /ros3u5/+3t 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 hgzfvce8: e 5y2as 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage oe258g :vecyz ff 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 200 tul)ag skk7e/ z8rns. If the power input to the primary is 100 W, we can expect the pk )kag es7/z8lower 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 of current at r: fsu;bb)uv cuco/el;kv);yzb;e ,(120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance ;;e;cf)zuv ;)/lb,k :uyb voer (subc1.0 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 usjjd2* jxx5;(fji(z+t( dq xfdually stepped up to 4500 V by a transformer and i j tz(d( j+25djx(f xd*jfqx;transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usuallf ag l 5f(+bz.t jt1afc:r1;tgy stepped up to 4500 V by a transformer and tr.f l:raf+g15tt;1cabg(fj tzansmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W 942 94bbj zq+9*hlxjutq2a qvf /okff. 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 withuf+xjokfqqbbzl9 4f / *29 hqtja9 v42 a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.65-/, 2arjble 7edmuacdaz*:o0 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 la27 b/oa-e5rc udzaed j:*m,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 dob*a3i7 uibdt4wn a 6-W line at 1000 V. How much less power would be lost if the power were transmii34dab uib 7t*tted 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 transmitted on a line ;mnhu 4bi:eg*bs. h ,ywith resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to excebhn hi4,e:g.y*m ;us bed 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 the cs9xor-,+mk ub0lj)jq;d mw c9 6hc( ejoil's mawor d -j;+ck)e c(6mj9bj9 hlm0,sx qugnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. Wha) fgwmok:l ezy1g;/j(t is this circuit's time f/ gzm:l;1o e)gyj(kw 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 o a:(ucshny*,lffz5ii/j x; . in an AC circuit 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-V AC outlet. +o/9/a6ephgj rm,rn z yc)f6qWhat is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC7te, qw 1pfm+f outlet. What is the resistance of the la q f,p+etfm17wmp?

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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 sup4chh02 z-wev0zn sh/b ply. What is the peak current h020wvs/ c znh4bzhe- 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 connected to zdjvex; vm . *k fohcus,+;6f9a 120-V ac power supply. What is the power dissipated inx; u+ ,v ;6f.9dmhk fozc*ejvs the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W r99 sbais0sv+3kslmkggkd )8 5esistor 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-6p+uzkw)jb aznd-) d esistor 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 50b) fx1wr:y 67zacy ;.kdo5 npv-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 ofy+yp f3:re0finp) +ukk0j o0t 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 reavqnzyi5 +/lw4ctance 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 1ce8; ez y0abv-4.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 1000 r mh 9:5tdv4c)2bsol6 ;ovaksHz?

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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 inductofjy;0be :5x6*n0rotgpe6b sk r when 120 V AC at a frequency of 20 kHz is t:f0*og6 ep;se 0 by65rxbnkjapplied 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 g/j m/hcdrh la(f6eji 86nh2:gvf+l)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 reactance of 0tcpcgp.5vwh)l yfzbqy,d,2x ;a; 0kp 2cu4i 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 hav5ubg sc*52 k -4;vs9welajtj5xwqu r7e 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor haverm .ws(g af p9s7t-y4/duks6t 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.;zwhyu;(pn: x 010-mF capacitor be 100 W?xnh; :p wz;y(u

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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 V?dtuol wn6;egv*1,f)4 qw;wvv

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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 circuit4mnfmb.2 y9c + 1zpkjw with 12.0 W resistance, 15.0 W inductive reactance, and 10.1 bfmw.c yn4 +9zk2mjp0 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 a/k fe-s/dgeam)zq3x,c h rw8. t 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in s/eeak 8rz/.gq3cs-m x )wd,fh eries?

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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 t 4i lv16j ynsxyh/l30a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serihi0 yv61l/y4 njtx 3lses?

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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 conne mna07. ad dguzug-:8sps+vf6emn/ a*cted in series with a 20-mH inductor, what is the idz fps7.v0m86-ud +nsm /unaag :a* gempedance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH in3qx4mo2yo qe8ductor, what is the pham3eq q84 oxy2ose 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 needed in a series cig/ fg87kjow 1lrcuit with a 20-mH coil and 1.0-mF capacitor for a total17owg8/gj kfl impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with 6yu 0u i/+q p4i8rhq -ati3uera 100-W resistor and 15-mH coil to get a total impedance of 110 -0uqa8ii/qh4uurty3ep r+i6W 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 Hz forlxwn2x oop-34 a total ix-op 42 lwnox3mpedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-Mtr mbf-(upwx 7v:-w 3bHz for a total impedance of 150 kb- mxup:fr7wtv3( -bwW?

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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 capacv yrq ,+p7obms7+r-cmitor. What is the impedance av,-cr+mq+ 7 mybs7orpt 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in r:/x5bk pqb(rw0g x6 zseries with a 10-mF capacitor at 1.0 kHz for a total impedance ofrx /b6kpb5r z(qxw:0 g 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 kHz for a phasy)-2misio3qfbd(m - pe a(- pm-i b3qf2idosm)yngle 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 resisr6, dex(rznt5m6 ), hor:bi w*vx g8sftor at 1.0 kHz for a total imp6,m*,)z5sr rio(ewr8b6 fdg: h xtnxvedance 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 d dg2xl 4+wr/t.os j16gske3 xseries with a 100-mF capacitor at 120 Hz. What is the phase an w1 36 sdjkxl2rxd.gs/4+ egtogle?

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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 Htp1m2yr,.2cau: :;f a rrhldbz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor ar:pa 2l;y,c 2mdrbr u:1. htrafe 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-mF capacitor, and a (x7+onet xb*d 0.350-H inductor. The circuit is connected to a 120-(n7etxxd+ob* V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an indnbqm1 .zkiuii7p 014nuctor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz 4nk 10.znpqiiu b1im7power 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 containing a 50-W resistor, a y/kqbw-9fno alv)i k/os9m 4110-mF capacitor, and a 0.45-H inductor, whw/a y4ov)kkm/1bn9fsl-9 o qien 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 500-048zkci ;f-linb,/r m h nq0tyW resistor for a phase angle of ,i t-;nrh /c0zbilf80mqn k4y$40^{\circ}$ 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.drrt- wcx*+1fp 5yhm 9 At what frequency should the circuit be driven in 9p w hc*d+ym1f5trrx- 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 resistance,x x*zd62quq z3 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circ zxq qu*63xdz2uit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuz(gxw;t- qk bmm3t(/zbpda /8it 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 resis o dd1hj6ez7-wzhg(c yz3q5n/tance of 30 W. What is the p e dozzgy h7h3(c6n5q-1/djzwower 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 s bdeq.-vta9w o5ho8*k n(b33p+ lknszeries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductorzl b5k-h3 9kt vb(3 enwndqsp* 8+ao.o, 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-poz 3/x (jg9e9t+1xtj l6 aq.rttxfa6mF capacitor and a 15-mH coil in series?931gxx/tfqlz t+9jo.x6(re 6a ptjta

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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 dqqq/ qbg.8- cu* ijz,series with a 4.7-mF capacitor for a resonant frequec*d bqg u./i8q-z qjq,ncy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for c**dyi:i :a cn( )bb*dcwg)rfa resonant frequency of 1g *cwrcbi):(dnca**b dfy: ) i000 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 resistor and ajm1toho7w-k 3:dwiv5qpiot yp 6 k)*4 : ,dmbr 40-mH coil if the resonant frequency of the - tp) 4ywt 1 oi7p3q6*owm:i:odk ,5mrkhdbjvcircuit is to be 1000 Hz?

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