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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 ubrr n)073zw f k9bbjhug4 p1ouxp c*e4+7j7aenits of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction st8bhx,zr abrb 4*cg8d* ates 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 chs diuuv-. n-u/gl8 7ciange on the induces7l udvu8.gn /i- icu-d $emf$, 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 h1a9q( sap lwtqj488z3uds 3z3 ek9skof the magnetic field through a loop of wire produces what eak9aqj d s38 14t slqph9w3z3u8z(skkind of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind nshdpb4jm3a ,/-is 5yof change on the induced4smi pd3/-5bhy ,jsna $emf$, 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 from a magmacjt k l5z6,cte(7/hnetic 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 currentxx-br8 v.hnm* in a conductor will be.v 8-nbrx m*xh that which 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 horiz/;kkqzscu/ 7a ontal table. A bar magnet is held above its center with its n/kk7; /uqs cazorth pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above itdk;vwv0qow:j;*/lefqy2l ) ls center with its north pole pointing down, and released. As it2qy)el/wfo k j*;d l l0:v;vwq 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 magnetic field vector p8i 1 tmsd *,d4vi;z;cbdbir rii:l ;(eoints straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induc, zii1:vdlt; ided i*rm; b(; 4bsr8cied 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 levelpo3kt coz;*kr+z4 qd- table top in a region where the magnetic field vector pointrkp oq3zd ;+tzc*k4-o s straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a howc3zm*um* g4tmcx5r s)xx:nj ; 4lm -vrizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil a;5mvrtxxmslcj 4mx3)uz4 cgnw -*m: *s 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-increasing 7pcs4o2h4mqkg j z0.p current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circz44j2 hok7p q.pm gsc0les

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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 the north pole enterin7snnge r.(db fp 0.sm+0abc2tg first. As the north pole enters the wire, the indr e bnfg psn(tc2+07a.bmds0.uced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis wh7.g iawwi n7;iose direction 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 innw .i7a;iigw7duced $emf$ 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 angusb+6ywc63t+ viyd +(8wi rcm olar 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 wc 3++ii +mwdy(b s6y 86tcvroof 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.gbw c1h,;k8hw
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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 t b9pa,uwag:iov7jl2 )hat 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 flze5u w(g 3l*uield. 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 movedlj .6bvl k8a x6g:x5wa northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the pol .8xaj x6gvalw6k:5b tential 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 , m83nmyq2y uk-pq.w) /+fhjsu-r wki a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transsgo) jwt-se6mr f*9 (jforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frequenc7ft fya mas/82y of the fs2fy /8at7am $emf$ 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 devu:qzi 3471h bsj ko1l0l :rtqmice 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 devicv ;-vagudp j +kpy313se 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 ad : x7b0rb+qtw-w68zalxmu6 primary coil then it i -ltqbbwmaz+x70 6r: u dwa68xs 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 con ucy :ip;2a,,lulri i/tains more loops than the secondary coil then it il/,ui:ipac riu,;2y l 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/m) g7lrx32co qvjk4yqk34qk input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circuiqf 8qpsa-1*j yt,

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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 ideevvi c4ew gk:mv; 41v4al battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistor iv4;kg i4 m4: wcvev1evs

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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 battery of 9)6- wwq- q xvwbka,w.2mlaaicmf9 j 5constant terminal voltage. At the moment conta95a-w m-waq),b9.lkfivm26qcw wajxct 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 *73e94g v7*:n1wcc zio)lpf0xere e atau(jkwith inductance 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 and resistance R irr carmrff 893 (g.a5f ((ldens 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 induct3 z+shq o8jmd 2kgkjr:0uw. )sor are connected in series to a battery. The time constant for the circuit represents the time required for the current tou)803+qz.w jj2dr kh s:goskm reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The battery i(2phz4f ishec* .tazk ()n uf0s suddenly removed from the circuit. The time constant for of the circuit represents the ti(pc ef) 0h2i4*auf k(hz stnz.me 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 uniya,l xsji4hr+82cf2 j uwgy7;ts 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 poo, wzwo5 c(m-x7ni+s bwer 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 connected to an AC xiajf:bb;1 a+7cwvteu d 9s73power supply. In this circuit, the currentu 7sc;xe3ta7d+ vij b9wb1a f:

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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 c8 ufvf0(-e6rc8cv xc8hloa .mircuit changes by what factor when the frequency isvoc 8fhav8 6r-c8ml .f(0euxc 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 across an inductor is doubled, the induct;zv8:bddjvw4j ; um1dive reactance of that inductj;db mvdjwv41u z;:d8 or

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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 zezypyf4 oe--l;6-rsgwro, the inductive reactance of l -6s p;e-w4z-ygyofrthat 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 thagywi9(( n ,o6j re g/qptz-4 mw6/xlois circuit, the currenjrpy x( q,t6in-6l/gaeowz4 gm 9o(w /t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac cirr( vvw10brj p-mo8wa/.x 7ya5ne2 a y(reob;xcuit changes by what factor when the frequenb8 j2.enxa rr oxr 7y0;vabwm(-yp5/1 aoew( vcy is 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 volhtva /yu76 ce9tfxrk ,h8*4k9zn4zbj .j mfj;tage across a capacitor approaches zero, the capacitive reactance of that cap9tj k;f z,h8xtzamb/ j44 97jc .hv *kuyenfr6acitor

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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 dem92w0.c hn k0q9bk vthe inductor and capacitor in a RL 2.0dmwvnbkh09c q9keC 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 ;o f36ov7wrjv RLC 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 impedance of the circuit increases if R incrts vcab t64r8pdk8.j:4: bak o.)ds zyeases. When is this ta4b8:skj)d .. 4t8 kroz:abdy pvs c6statement 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 th; rw* qq1w enf1,hxu203wabzie 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 impedance of the circuit increases ifd*:u(dd42zb-jot, t n9 jtton $X_C$ 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;4pznl h0+b1ug vbc(h series circuit, the resona4h(u z+pbvnbl1ch0g ;nt frequency 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. At 2gwgfa7 bjut1.k7ou65 ty v8( f bnl:cik* n(nresonance,

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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 cira1)y/ -m g mlhv)zphm/cuit 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 radiud) :gbs2z2g sfs 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop whs22bgz ds gf:)en the 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 radij (wctom be9j*-j7eepl9u )/hus 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when th 7o(cwjjuhml*9pe)ee t9b/j- e 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 rotatvo mok 0a 22r6id)l.bking in a uniform magnetic field of 0.20 T. Find the ma bir voko)6dlkm.02a2gnetic flux through the loop when the plane of the loop 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 adjust3q.y lk );2ssrgoy n3cu55d olable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes fromb6 4+0a* e( zthxaskjt $4.0 \times 10^{-5} \; Wb$ 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 w2,:x b-w :v0 :hmvva (cmdzzgxire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the d zm(v:vvxmxhab20c:g -zw:,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 1nefaaca99ik.t :3 b6b5 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 , b, l6) l b+ optl(-rafke.pe.0qqgnfand area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies hor yp)pxh bcda/fc81q+3hk6io6izontally at a location where the dc6q/iy co)6 1dxk3 +8pbph hfaownward component of 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 bar that is 2.0 m long rotates at a6letc )xt 4q4kt3f +*da r/hxq5krhy8 constant angular velocity of 2.0 rad/s about a vertical axi /k 8+df) taqet5*xqlrhk4x 3ryh4tc 6s 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 ffoml5pb0z4 )ha )l yz:2c+kka cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire obkq2;.bgq si +f 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 80zi y:nuk tw ep5s;0f8o r+92fk rectangular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature r0 ; fe+ ip: wsnrtk5y2zku8f9ootates 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 turns of wire of area v rii32alw65 9 3zmyy./cav dk$0.090 \; m^{2}$ 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 geki4y6mc b(nv*qx8m 7-i 5vurjnerator with an output of 12 V maximum when rotated at * jyb(v r46 u-8vc mmn7xiqk5i60 Hz. A magnetic 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 genernt.(s.*t iopt t exbhnn :(q6.)w ko*jator 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 resistance of 6.007yn ei5oxvlc8)*ses*d yr. 3a W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor op9 cx . 7t+0 ue115nxskbxf:nfko 4jyujerates on 120 V AC, and when running at fu kf seou+cb7n4kn9xx1: 0ty1jxujf5. ll 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 internai0,qa t8b5n se3e5wehl resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up currbe,h5qes5w it 0ea8 n3ent?

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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 connected to a 24-V r*q 8bjg88pg*ux f nh)power supply. The operating current is 1.0 A at pux*8gnh8qg*fr8 )bj 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 connect*yht9dv3 q.md ed to a 24-V power supply. The operating currentvyqt 93hm*dd . 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 transformer96fdd pxjszm93/7c q+ y p6jp 3p;bamr is 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 transformer causes 14 A wmn)agag t+qp6 am0 4+jbz9m6to flow in the secondary. How many turns are in the secondary?bn)tmg z6 0ag4wp am 9+6jmaq+

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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 primary if the 24-Vfvb 2o:0klsu7 secondary has 100 turb0ufsokv2l 7: ns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn s9t7,vhd 7cs r 7, . .cjlrpmvt1qny6gcecondary coil. If the current in the secondary is 3.0 A, whaqpcmcdn6y ltvr.r 7j7h 9. 7sct,vg, 1t 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 trans9+v5jz kzohgxuxo 4n )zx qj8,1 v9tf3former. Assuming 100% efficiency, how many amps at 24xuf1 9vxth+j 3,4g o)z vjnko98zx5 zq 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 750nv: vvbhnq+ixv, 5 xl2y;954m3imclf 0 V at 10.0 mA. The primary coil operates on 120 V. What does the primary n,y5xvivv3+v:2 9b4; h iqnmm 5clfxl 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 cop izsm: bro:z.s)3v *-u btjw-il and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what volt ):.z 3bto*psruz jsib-w-:vmage 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 its secolkp.xq /h)5vr nda/v.q)5kl h prxry coil. 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 has 100 turns and its s1 w+(m4 iscpqn;xqk8 cecondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the x;qp1+8ckswmicqn (4secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and itn rc.0+ m9s cnng7gn 9m2tin-ds secondary has 200 turns. If the input voltage to the primarysn7nn .+rntd 9g 2 nmccg-9m0i is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a tranmd6f;u h)h8dzsformer has 100 turns and its secondary has 200 turns. If the power if8h d;muh6)d znput to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually wo 5(kfstzw/yohy -39 stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if th(sy5o9 okwwz3-/ft yhe 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 ypuv,p 6*0z2ywpxr2e 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 liwy u6 py pr,2z*px2v0ene.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually steppeds n z52.t3llumkhkfme5 2b+*z up to 4500 V by a transformer and transmitted t2hs3 m+kmubf2z5l ek*. zn5 tlhrough 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 rr3r31kv- mrx besistance of 0.60 W. A generator producm3br rvkx-13r es 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 imy9lt; b:kzcsx4e e rg5( -7ohas 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 is lost when the tranl(9io-54 7mz gsycbtre: e;kxsformer 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 nm 1*1vddr*qd1000 V. How much less power would be lost if the power 1vr*dn1dqm *dwere transmitted 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 trans2k tm* g6muzd+mitted on a line with resistance of 0.60 W. To what voltage mustu 6t*+kgzmdm 2 the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energ ((9ix3sdasp9w51 fbzy )idbs y is stored in the coil's magnetic field?si s(3xdfbybd p19sai) (w z95

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. What is thqo * f/p ybkt3zw akzk8bp:*k8d7tl,, is circuit,kqp /aw,:klkf37b8 zd*bt *t8zokp y 's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC ciddo /bi/*+w; 6pptz tkezg 9d-rcuit 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. What is the peak curb xfdwrzyt u m/2w/7 /n czlomh.p0v9,81pw7jrent?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outled)4 l yc)xu+rnt. What is the resistance of the lampu x n4)ldc+yr)?

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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 co u jg3 a,/6ji(opje*exnnected to a 120-V ac power supply. What is the peak current throp(j3ageo/ ,6j*u jex iugh 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 tlkp)f o(1,q9 y 9hk2e ,ungqwwo a 120-V ac power supply. What is the power dissipate,1uqon9fk q (py9l,w hg2 )kwed in 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 resist:rnfaascf * s ks2 41micz-u;+or 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 resis4zjf6 sm+g vh1 yaio;(tor 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 resistor is26u cogps7 (sp $I = 0.80 \sin (240 t)$. 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 ac4ocg w9r;(fmrtzm4 u3:f 0 jb 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;k (.kn4m8i 9j7u7wm g8ceqqw1 3vuyc- nfecv 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 oi t0 nyj sbu 84yiy518l*k*dq7p f(fca 14.0-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 inducteb i +dq*c lb4 6:2p(ivuexa3jiio*y 7ive 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 when 120 V ACa;eib(5wc c n+ at a frequency of 20 kHz is applied to c5(w ; biea+cnit?

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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, 60. foqy6b n(-xr vb(4 fpa)8hkf30 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 n(lch;, ogv 1zp lzg()yh;3bmat 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 reactanc1y (tu;naxl9 be 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 react8 xwm7tv tqf8o tg+(w3ance 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 will1yhk,ktd68 v z the capacitive reactance of a 0.010-mF capacitor be 100 Wydz8v ,th k6k1?

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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. p;3 d zm+z c0-fjk/xqrzxtl-.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 12oo je.r 1/y wzlg21d,es ,c4gcz:hlh1.0 W resistance, 15.0 W inductive reactance, 1 1r o 4ws lld,c2z1go,cegj/hz:e y.hand 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500/hk3w nyy16mg Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacit g/ 6y1y3hwmnkor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resdf9pp)0u n;s tj,nu ,kistor, 20-mH coil, and 1.0-mF capacitostu 0n ,;pnuf9)k,d pjr are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, whad:,t:,vdv e 3ggfqu(tu p)a7qt is the impedance at efdv3tgd ,7u vau):pqg :tq,( 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 inducji+5zq j fa;5itor, what is the phase angle at 100aizqj i; 55f+j0 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil az0k hrrs3b. n-nd 1.0-mF capacitor for a total isbrz- k.h nr03mpedance 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 capacita66aalo8urd4fnxcu f,5-5dnx nces is needed in series with a 100-W resistor and 15-mH coil to get a 6xu4f-u d,a rn55dnx6lcf8oatotal 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 45 v k b0;73ie)kofujg3r: rt knq-4gkv70-mH inductor at 5000 Hz for a tot3vrr)47fkg 3 g0i;kbtv 7 kenoj:uk- qal impedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series witp 8 xt vsz8a/ci20 uvgow*07cxh a 100-kW resistor at 1.0-MHz for a total impedance 0sax 8 v 20/z8up cvgoxtc*i7wof 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 capacitor5 ixp.f ,uy+ch. What is the impedance at 1000 Hz?.uc xyf pih5+,

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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 capacit/mfn- 3v.a tfbn50n+ tok i:qjor at 1.0 kHz for a total impedance of 45 Wj/ ntvm:onabi.30qf- f5k+n t?

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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 1.0q)02. 8kfl6 x9vveh2zmvneazj(bkd* kHz for a phase zaj.k 9dme2k8bxfl)v h 206*vq( nevzangle 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 to1+)qun - ud dasz46x1nuxpwn 4tal impedance of 45 W?q+z)uxn4 w s 11u4nadp -6xdun

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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 100p +ljruz 9p9icl0p 9m2-mF capacitor at 120 Hz. What is the phamll u09i 2rjp99+cp zpse angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1hv g6u4 3tnv.k.0-mF capacitor are conneuvnvk3. gh4t 6cted 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.wqyxneipu-r t6((y( resistor, a 10.0-mF capacitor, and a 0.350-H induqrty-p(u. 6i(we yx(n ctor. The circuit is connected to a 120-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 a),34x wupua(*tlrj* e dfp-fof capacitive reactance 30 W, and an inductor of inductiverpa u4*wu*3ej f,dlx()t ap-f 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 for56k7ui1oifa )2koyj ct* km9k 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 suppck *k)29o im7t ujifky 5a6o1kly?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is n4: pqkq6 j1sa0 b(hcw97 hiyivecessary in series with a 500-W resistor for a phase angle of4ahq0svk(ih:bw96ycj17iq p $40^{\circ}$ 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. At wh :hrt+gv,;p14(xo z 9jfhs1y9k tqlweat frequency should the circuit be driven in order to have maximum power transferrl4 rzv twjp1:gts,hq xk;h9fo19 ey+(ed 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, 15.q c +(w+ybnvkb,1c*qmax-n;r 0 W inductive reactance,;wny qcm-a+q*c+ br,bkn1 v( x and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an gue*aaoci9w , s4)u u4AC 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 30 W. )mtnmcr)g :)n What is the porm nm):n)cg)twer 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 lgm d-r/b vez.3+q3ej for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inducb3 -g+v/ dmee.q3 jzlrtor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in serixmg( mesa 2g2,es?x22m (ag,emsg

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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 capacitoeh*w4309zzu:x lc dsor for a resonant frequency of 10 kH3 ol 4:c0xhd zwszue9*z?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is need,*vbf6fas dk 3ed in series with a 3.7-mH inductor for a resonant frequency of 100vksf3b, 6d *af0 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 andk9c2da f:w tz skgwv7 d+ 1u(oh56g8 wtii.pd, a 40-mH coil if the resonant frequency of the circuit is to w+2hk dg7 5cik tw8zodi da:wu.fv,gtps619( be 1000 Hz?

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