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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 fxc00q .c( 4ut+crowvw lux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states *xsei*2of lh9that 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 produceun4 : fmn)pg8rs what kind of change on the inducedufr4mnnpg: ) 8 $emf$, 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 throuhwfpmv6 fn.rg;, j24 c7p15xx8m t.9uvwjkhkgh a loop of wire produces what kind of change on the i25n;upt.gm7r4x, fp1mw9hxjw j6k f 8.hvv cknduced $emf$, 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 of change on thelhjdh9g y/2fy a1/o o) inducedoa)2olyhf1//g d jhy9 $emf$, 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 2qo4t/ p*(fpur-c o )sho xu)ea 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 direvg:chmb+k1g6w y 9slgt81 z)nction of an induced current in a conductor will be that which tends to produce which of the following e6z l b:81)y+s9m1kngghgvtwcffects?

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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 1kh 4we. 8v1a7idshty a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary maghws.7 tvykea4dh811i net 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 tabl* p2 lqk,4t q,k)e2q js) :cyatqjw6zee. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the fa qqq)z yjp 4t2e)qw6le2ctkj:*s,, k alling 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 rxl /1gj-m)wu wegion where the magnetic field vector points straight up. The magnetiulgw jwm/)1x- c 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 tablec 4 7a3p xhi* hr/sp2uznc97wz top in a 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 currenzurc*p pzwxc734sai hn927/ ht in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magn6.)mkmnw7t/tw vf; q5mx3uly etic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the uvtm.nq/7tx; w53m yw mfk )6lfield 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-inc yirze 220 z;bvfuqcad2cl +(6reasing current2 2+ve;i0bu ryf62(zqazc cld northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a9 2i,*0/egzaam6i p0f ygjgc.a,gsj a loop of wire with the north pole entering first. As the north pole enters tggi0 ye,g06japc./,f*aiga jz2 9ams he wire, the induced 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 7 xpssf,sbiu(;)t)wb w20megangular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the)wisbs ,w 7u;e 2g mbptfxs(0) 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 3;dtql:y dnos2n /z ;hangular speed about an axis whose directionddhqo2; / 3:ltyns;z n 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 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.b.l+ avfh owi;3 ed9j,( fdiq0
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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 nmfyk4,5op 7(z ppf4(f,m pnai j s4:hthat 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 3stk0n bgl(w ame) 3tiua94g3 field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northwaxv+h.1tm-vzb dsgs )+7;qpjl2 si8w qrd at con -xidv8s;bgqq1 j+p+ hm2s7)tz.v l swstant 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 constant angular velocitwl 9z1x2y mq;b4 wn*;7tjwfjky $\omega$ 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 transfgxtx9oa83jl4 dj k+y 8bg40y norms

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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 each5oabxghh) 0 4u second. The frequency of tha50h4o gbxu h)e $emf$ 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 usedk7c9cky11guu lc k((p to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device thaw 1a, l7g07w/c cjajz za,wo3hf n(j;55ehx qct

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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 secodsuet8uj9s*2zti/j ( ndary coil contains more loops than the primary coil then it se(/i*uds2 jttu98jz is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil conta)nvuv )1li9xfvj *lf)a (lawb fa-a(/ins more loops than the secondary coil then it ia()/ (ubav)f lfv) fl9lwaa1-x *nji vs 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 inpuzz px)iv0wpa7 ixiz6ir h7:i41d/c,qt

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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 cikup5 5s5 sm 9f*ihqo8jrcuit,

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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 wwngb7.4:j 1z;,j bzfjg5ay nare connected in series to an ideal battery of constant terminal voltage. At the moment contact is madb1 ;w.ja 7 : w,jjgzgnfy5b4nze 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 tr a-oy(*zi nz;o an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voiz-y ar;z(*onltage 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 resistan7 klfl82i2 m-k nhovky*f6tx) zr;ad+ce 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 wpjzc/-p;*qw8e,k -uu7 gr5pxtd5 p ypith 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 resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. Thcb-sapf7/,k ui:un ui.-p)a a e time constant for the circuit represents the time required for the current to ,ubc-)p-:s/ 7uaiuka n. afpireach

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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-b 5o(srd:e5lg6b f7qt ,pqognected in series to a battery. The battery is suddenly remqb -r6 5et:s,7 glqo5gfodbp (oved from the circuit. 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 htzw o5 eha-7qyzdp--c3 -pw 4have 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 s1n 7ywz csgb;ss.6h7s( p7 dwv-v-wgpupply. 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 power suk.ro( hhea*-z,, qasepply. In this circuit, the currenh, qs*hz (ao-.erk ,aet

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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 whabecf71z1tche g- ,e8mt factor when the frequency is tec 1,btfe178 - gheczmripled?

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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 in+hd x1,qp 6lzjductor is doubled, the inductive reactanp+hlz dj1q6x,ce 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 voltage across an inductpv,y m 30kdto8or approaches zero, the inductive reactance of that coymo8td3k 0pv,il

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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 supplyns(bz vej+b qk, 3j:7y. In this circuit, the curreek7+ qsn:jv (j byb,3znt

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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 circuwh rwz4cv 0 *ngs+kw 0j2y,f1hit changes by what factor when the frequency is triplhhwk20j04f r w+y w *s1zvncg,ed?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the A7a fsd pspn q;i:7a4.cC voltage across a capacitor approaches zero, the capacitive reac.:fps7a 4 d 7sqi;apcntance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between th(v(bbedhh ten.6ou52bdkn t /wk+ h u+)v;h m8e voltages of the inductor and capacitor in a RLC ser(2)hwd ;nhd8hnev u +6 btvtkeb5 k/obh m+.u(ies circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined agd z93md- yktlfbj)0 +tzy77d s $\cos M = R/Z$, 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 impedanl*rm/l-mb p0o ce of the circuit increases if R increases. When is -p bmmo*0r/ llthis statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increasesjf-xeg6qv0q(g ./pmt 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 offtf 5f9 v7xy jtabn-58x)zf j50pxn 9q the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circgen7f61t.e5 jr+* +zdjgfnf duit, the resonant frequency of that circuit wil1 ++nj z g6.d *fetend57fjfgrl

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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 (ozmy a;ytio;1 4qw- odriven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuic)(i:y8sofe(r vi,s wt occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating 8:s y/w (ofnrgin a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the m:(/f8o nrgyws agnetic 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 field of -vb3y ;rvlmzzd 5kz9n y1zb/qcs 60e30.20 T. Find the magnetic flux through the loop when the plane of the loop and the m;1m s6 zzdyl0 b93qvyv3z5 ke r/-bnczagnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in hg-oma*r10 bs- jg3vga uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the or*agbgh vs 1-mg-3 j0loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable singlermepvmg;25xr0*cmv8, t*4 rvghef z)q6vwz2 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 colu51 ta7p 9v arvp) too)nr)z-/h )utzil changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped wix7n cuc14mhj 0je(d8ias e *scg4+w/ith 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 0.5i*ge nhmsci+84/7c40jecjxs1 a wu(d0 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turnsp ur((l gxaclw.d/om p,n y.ox s+,o7; 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 area 8fwwf1+5 mwbaon555 .ndatnj$0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at am mvi, rl:s tmtf1fr -7lh9nq5ank52a6)elu 8 location where the downward component of the Earth's magnetic la-km h7nm)8la6 1trft52e n mqu95:v,rlfsi 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 a constant angular velocit5k 0rxd yuc2s-ci(6hd jg7uu4 b5q6zhy of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic cu( uhk7 h5c 6y0ux52id4rj6-b sdqgz 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 crossb7zq/:yt o,n5 yyj3zs-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 consist1 + )fg8f3g vo0t4wc ltv9jms8bn4zny s of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on o09xknfbc t1 h7lli47its 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 nclix7 4ht971 lfb0okloop 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 wi djsgn1/ q*xlyyss8( 5re 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 si7*nns*o e,k(zad(fdo; kf6 qemple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is availabk*dfo ;ese7 f z6 ,*(nqaod(knle. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a g o21fxt -a9ycad,(ftp,6l qymaximum $emf$ 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 m2(9 -i5; *ho7jy cbcoicgdlidotor 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 ow ( h p)p+bmy4at2u sw3 1u4+vtzud hjw94/dfdf 6.00 W. The motor operates on 120 V AC, and w9 mv+ fuh4dt2y1 h)uajw d+3(s bdu4ppwwz/4t hen running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24mercw7-pc-r0lx b , 1o-V power supply. The operating c xc- 0pr7wbc,-e m1rlourrent is 1.0 A. What is the 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 connected tcl 26g.4 0hp5 l,,mqh-awadig nx- kkzo a 24-V power supply. The operak,2llgmkag 0 hn4hi6qwa- .p d-c5xz, ting current 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 connected to a 24-V power sup2 o*d+hn 9g0bsfho jt.ply. The operating current is 1.0 A at full speed. Wh+gbf 0o29.ds noht *jhat 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 neek.1 xjv97h ra v(h i8zsi*aug2ded 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 6 3w8s9q vutz:num c;jprimary of a transformer causes 14 A to flow in the secondary. How many turns arecq;63uum n9w8js ztv: in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary izu. t 2e-;wc ks u(kl+e9g;cth yp4h.ff the 24-V secondary has 100 49h;uzc-.+pft ywck(.2e st; guheklturns?

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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 5 m8;, pv hf:/.jw*vdd8fwo9ydayb ;i d00-turn primary coil and a 2000-turn secondary coil. If the current in the secondary io.m8 9wbd v;8: ,*da/dpviffw; dyyhj s 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% efficiekd h;1(gb er7wncy, how many amps at 24 Vb g(;7erdk1 wh 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 od,lts3r a68 j7500 V at 10.0 mA. The primary a lot68jsd3 ,rcoil 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 prilv5ih)jvu-p* nr e2h 7mary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is pres-hr52vv *l7heni) upj ent 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 prhpboi6os6fy ;:rk,(p imary coil and 300 turns on its secondap: kbf, (; ophrio6sy6ry 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 secondary has 2 va+j 88dxc 9r)co-imy00 turns. If the input current at the primary is 100 A, we can expect the oc-) mva8r cj9+oxy8id utput current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turnss0i+-bez g*voi/ bd1 y. If the input voltage t1g/di-iobzebv 0 y*s +o the primary 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 transformer has 100 turns and its secondaryc7d * f3pr3b g,lrz*sh has 200 turns. If the power input to the primary is 100 W, we can expect33dg,z bc*rr7p*fl sh 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 ) 8jz /6qbrfzpcurrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primz6j/8 q z)prbfary 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 voltag;0s wv/ozn46 m+n glkie is usually stepped up to 4500 V by a transformer and transmitted through a power line of totaozi 6/k0ng;s w4nvm+ ll 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 voltag j *m8 49y6er (ak*7hvw..)eid fv llwo9gejuee is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the vouw4e6g)ew. d*r7vi 8lv 9e *hakjly9omj(ef.ltage 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. A-ry lkk- r49 e0n;ychr generator producencly4 -;r-0erryhk9ks 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 resistance ofxi-1zil-e wg6m38w j.d e vnh1 0.60 W. A generator produces 100 V at 70 A. h 6idvwlni1 -wx. j3megz1-e 8In 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 xppc do sdhe -0si80()a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 30000ex0s(-i )dh csppd 8o 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 bj67wm.xvc u ;is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loswbuxm.;cj 67 vs 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 the c )zfycxjd) wr r q(niqdugocq1u-p5((( 5an 1-oil's magnetic f(-q dfq1(u q5zcu (jxai 1nr5)p n)rgo-cdyw(ield?

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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 inductorr:n,lqllfz;h 3 n7i9u . What is this circuit's time ch9 i3n l7fl ,ln;urqz:onstant?

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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 whe:/b h 8geq87h3-rgi ;m 0mu dmb4oneyjre 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 curnj ;jx2uip4uiv;vun52 wu*b jx 23ft6rent?

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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 outlet. What is19a;yyo y w;l4kq jtjvg:;s6m the resistance of the lam1 ;vtm;9 g:sawo6y yjj4l ykq;p?

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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 con- vw/ 6ekncq)wc5fsv1*4 1alq5 rnset;as lz6 nected to a 120-V ac power supply. What is the peak current through t65r 6qwl)aew1/kqea4*ns1 lfczt ;v snv- cs5he 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 connectx o49;*upo(ucerus8 i ed to a 120-V ac power supply. What is the power dissipated in the resist9ipx8coe 4uuosu* r; (or?

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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 resib0m 5 1g2dgc)qs/gtwmstor 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 resistt5usx4doib18jf ,u k8 or 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 is opk,j wll))nak 9-4of wv4p7d$I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor 9z(wd5t yle;+zp uaaa*q 9w 4nn zq ;;m3p8hawat 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 2.5c v pp6ea;hf6/6xr ;mo0-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W o)q,.sag:v r js*qd+usf 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 reactancqx lu6kp03vx13ip t2 ce 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 AC at a3bj tlc pit0h, yvx/z 6pu4b21 frequency of 20 kHz is applied jbt0 1 lcuybp64hvxtpi,3/2 z 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- dn8*wy5rh(mfy*l ow+mH 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 reactav1z,nzb-: 7-mltyqs yoj*8 ptnce of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of of 2-1 nqf(rqgcapacitive 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 120dr/f b +q 6bqrnlio 167b,uv5l0 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 wil,ojhxc *ma .0gl the capacitive reactance of a 0.010-mF capacitor be 100 W?mo ax*h .,0jgc

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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 5.0/5e 1y7pduh,;d yiw ptk+mo d9 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 resistance, 15.0 W 7ur4;l,dphvd l .s) se((d8bo/rycje inductive reactance, and 10.0 W capacitivhjsde/ 7); pl e (ddlo(4,bs8crur.vye reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz ifuol(ju/6g a7 g a 100-W resistor, 20-mH coil, and 1.0-mF capacitor/6 7uggujlo(a 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 resistq:;vqs k*kei1y*q; b8bd 1rc-kh.flv or, 20-mH coil, and 1.0-mF capacitor are conn1iv v;bk8hc .es:r - q1kyd*q*fbkl;q ected 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 pwv2odpa9 :i 5oj c; 4ae.:cuwa 20-mH inductor, what is the impedc:w.ad2o9u aow ;e4:p i pv5jcance 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 iwu;c /lmr/)j/t pr9u onductor, what is the phase ;c/r9/ur w o/) ulmtjpangle 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 circuit with a 20-mH coil and 1tl h 6/ij;bp.i.0-mF capacitor for a total impedance of 10;t/bphl6 j .ii0 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 ausrjpk 9mp pk(e )*.wv,i6 i0f 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 H*vf0,u.je w p rikps6k(9m)ipz?

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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 5;oxpz 4uvlipm3*o8hk;ad:la+ m( -,xugc. zx000 Hz for a totg:8zlxu zm3 4pax uo+v-pl;kc ,ax;(.imo* hdal 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 bey 1uqq 0ojw9mod xx1):.)nuwo59v sim put in series with a 100-kW resistor at 1.0-MHz for a totq1o5 9:ux diqs.mywx10o))uv onm9 wjal impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is thep;x1 avq0g8 byl. 1x. r9vt hqvmg)fh0ss x4d: impedance atmx1ly s.0 xhf49;q:0b )1 .vstaggpdhv8v qr x 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 series with a 10-mF capacitor at 1.0 kHz for qh2vq6wx70ndxe .5r t x4 -;nh qeccm(a total w(xv2hqnnxc;q 6 m5ercd heq.xt40 7 -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 a 10-mF capacitorsgp7(w- 9 kfccu q;oxa8(km6o at 1.0 kHz for a phas kuwamo(8coc(-g 6f9 pkq sx7;e angle 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 tot0gxov gg1or6j sd k7vj ,lp5z4/q. mg,al impedancv,z1 j/.sggxl vp5o 6jg4q0dr7g mk,oe 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 k:yghmd7 l-lze;8j5c xm (f f,with a 100-mF capacitor at 120 Hz. What is the pha fjmlm(;c :857gk -zhyxe,lfdse 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 coilm9 lr )oi,npq e:5x9pf9o-ds z, and 1.0-mF capacitor are connected in see)d : xmrps-z,ipool 9f9 n59qries?

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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 capacit4i8zig1 qp)i20vn s+ *ox53andkbranor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz*p 8b2+a kni1i 4noq50zg) ra3vinsxd 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 i v/-0 esbryw- 7gsp+konductor of inductive reactance 30 W are connecte7-bgryv ws0k o-/p se+d 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 .yl lj/ fy uc,fz/.d)pa series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz powef ../ ulcylfd), jy/pzr 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 f ggwod.z0gr78 tzd8)big v-p;or a phase angle of trod-bd7p;.z80gzg ) vig8gw$40^{\circ}$ 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 = 10.0t,xhcj/ lev 4( mF. At what frequency should the circuit be driven in order to have maximum power transfetx/( , jc4lhverred 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 circ+5nmgrd2q da )uit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance5dd ga2r+ qmn), 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 Ayz ,mvv dd89.bf *j cupnmus)qb*k,* 2C 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. 7acqyi *+ht08 (kvm v5-l jspc What is t+v7k-(qpltcshyci8*5 vm a0 jhe power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RL;3eo9 1le0/nc av iggmC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 6e;g0n3m avg1c/o 9lie0-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 wp9xh+2prue( coil in series?hr pew2x(9u +p

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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;nkg 6n2 qk.qmye0/fv a 4.7-mF capacitor for a resonant frequency of 10nm0.qf k2 e6kn y/v;gq 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 7 xhm:vzhyw+ q-g.9urgg /un7for a resonant frequencuyr-v .:7+gu9 hh /n7zw mgqgxy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must b3c;f2 z wdhbki2/z-pa dr: 8wbe placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuiw;/z8kcp bwf zh3ia: 2b2d- drt is to be 1000 Hz?

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