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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 magneticsz08l6/3jmb u oev- hx flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that wm;5ec6vn5bh e * oul/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 wirx -,t2ae+xsq pe in a coil produces what kind of change on the i+se2 xpa-t q,xnduced $emf$, 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 thevyxab2 ;* m jy6lk:r;v magnetic field through a loop of wire produces what kind of change ox:vb*;2r lya yv6jm ;kn 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 of change on the indu w jt5 ra 8-d-;hzclmwp)(3eytcewp t rze(aj)wl ym35htd8c;-- d $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic fielsgi29d6ioeg,krz hs 2+k38 4ms9;jgxf dp5x ed 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, o,k-s7g+l5s0 q bfn 2eh/cbo*wa,tgd- 6 nug tthe direction of an induced current in a conductor will be that which tends to prodknsgfnuw 56l/,a c+gd gb*e,07th- s ootqb-2uce 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. fl0nh *d;q5 pz A bar magnet is held above itszlh* d p5;0nfq center with its north 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 isxn.vq2m1 z.1qcyr6 0sr ges x) held above its center with its north pole pointing down, and released. As it approacr. rz2m1qgysxev 160sxn ).qches 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 magnepb9w ( qdv5s.xtic field vector points straight up. The mag.(x s9qbvd w5pnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where(uc6jef+:wefn33 p w7vdja f, the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the fin pf(367edv,jffcw: +w3u eajeld 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 thsl p*s )ig.o39ynmo+ht: w3qje 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 as .9m *:liojqwp3 +yh3tngos)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 a3eewv+,s+ev0d -xdl1 giz jq3n ever-increasing current northward. Two coils of wire lie flat on the table, one on either siiwexs3l1 0,q+e gdvvdze 3+-jde of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire wimda8 a vzj9el95d )d9d9:ze msth the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed d8 de zzd:mv9a)9md 9 9al5ejsfrom 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 conlxbpy4rtd2s2qa8bv 20/(vm6lrc bvbc/ :r0 h stant angular 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 iflpc lr vryv ct2x 6bm2(4 dbb8qabr/ 0/vh2s0: 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 /xli f9 0z.wbok-yxj jo9r:0fat constant angular speed about an axis whose direction can be v-0rj:xo fjwlx0f.ibk9 y z9/oaried. 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.::j:papw:exc.3 x6 h tb+jw ec
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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 that aja:vf ofk )-akxqf- :r9:d6qur8o0no n $emf$ 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 magneti9 xq iywvl3q;g0 yn)o9c 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 northbrh:-6 km8yaw412 v jjy s/ke6ucvm :tward at constant velocity through a magnetic field that poin/c:kjt2m- y:uv 6h4a 1yrksjmbw6 e8vts 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 an)vqw0 ts5 +0rtlw3n+b zncspr5g/ 4i ngular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator trad,hwf:jyqr( wu:p7 rmh4e5 q;nsforms

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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 througoa6- v9jstzfdh1**h lh 60 revolutions each second. The frequency of the -h fzo6v jt*s9h1adl* $emf$ 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/ r1mqze2t0pd 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 devicdzxjlm .y:sb+*/ z:i pe 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 .9wj;p f9 ltd;zolm a+the primary coil then it is w9+ldo;fa l;t.9z pjm a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains mori55(6cmazjbzm e;j s)e loops than the secondary coijjzai55mm c6;(b z es)l then it is 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 powb;zv h.;h(uh y9iriynp1ys2*er 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 circ*wg9-3 .qtall.b c ldqh(5yiduit,

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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 inductonkis4qwa 8 rk60f* ba3r are connected in series to an ideal battery of constant terminal voltage. At the mome kk8frnq4 aawi3bs0*6 nt 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 connectew. qh 6pl1t.dqg.hd;.bx d6opd in series to an ideal battery of constant terminal voltage. At the md..xdtq 1 6;dog hppq.6 l.whboment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with-,f gg3n-*rd dujk6 uj 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 in4nolf kc8)i0aeej* d tzyo*9bzc88e/ ductance 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. The time co;c yg/g7 )ncdyezro,8fvs+,edu;wr 1nstant for the circuit represew+c;8gyv,en,d1rsg foe uz;dy7r)/c nts the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series toa,78j*z q p-;c9r); gsfadrxbmf) utl a battery. The battery is suddenly removed from the circuit. The time constant for of the9 a qz s r)rc);judg;xl p,b-mtf78fa* circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the sam*q+ hanh 9 qmkhohhb)b7 8a(5le 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 cur6 h0t.uqwrm -brent

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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 supply. In this circuiyqg2j wsfr 06+t, the current6q 02gfywsr+j

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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 7z o/ih;lx o8nac circuit changes by what factor when the frequency is tripled zhxoo ni/;87l?

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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 vn6hnx9+.z mh holtage across an inductor is doubled, the inductive reactance of thathxh.+9 m6nhnz 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 inductor at8 z:z+d 4 v.ylacdqx7pproaches zero, the inductive reactance of tha7zac+8l. d 4:tqzydvxt 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 powe-ln4.g2;3x rguh lzpkr supply. In this circuit, the currenl.g p3l2n 4zkrg- ;xuht

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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 btp-bd;uy6sa *wf o*q 7y what factor when the frequency is triple-w ofp*;sqb y67taud* d?

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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 ACj ji:i5g 5titm mk):jeg0r:y ip-. fs: voltage across a capacitor approaches zero, the capacitive reactance of 5 m:rg:f5i ji g:mptei) - kijjy.0:tsthat 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,p k *3;h.n 5nlog o6x ;kej69ptkgzjv of the inductor and capacitor in a RLC sejkot 5xg,l3* v;oenj.6z;pghkn p9 k6ries 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 cu+ mc a/efb 7ryls7-q(ircuit 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 ga o5pj *ibm92kkvdzi oz, 921circuit increases if R increases. When is this statemenk2k19z9j, vib*mpg25 z idao ot 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. q/lgc);b4ma o,by6d y The 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 impedance of the circ j6eddm7wnav*62nfy c 3 y.w:duit 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 LRl 0g 0 y0/ggpxgh;jvj0C series circuit, the resonant fp/gh;g0jyg0 0gxl j0vrequency 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 resonancc;d 3wy3 sn7gv,kf ru26kaq) me,

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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 circuit occurs wt it..l)ahvp) hen

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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 in a unifom 4b4duiqf h9t/mk8a7rm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane ofb/ 7fidk8u9 4taqmm4 h the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnet n7 lq2;-41do bdcrmqqic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vecqqo;nl4dq cdm-b2r1 7tor 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 ic3p2vuvd: 1a4 ju7kt),gyjzr n a uniform magnetic field of 0.20 T. Find the magnetic flux througkyu: 2vv,jj)3p 7uc1rda 4t gzh 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 adjustable single8h ngriqc *mh b7op)(9 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 channs k07 i o6)ip8kdkb;iges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 5wm6yg7cu-a iturns 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 ua5w-c76y mg ifield 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 w98mhun43sz hzith 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and areash5 zgd6z7, mh $0.20 \; m^{2}$ 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 a l*oor )vbx6(u)./x )pvyt h-dfwo hp/rocation where the downwawvrf)6hd /)rtv ox* py/(ox- h.obpu)rd 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 a constanip5a7vxscc;z 9u1mst( a v. gmkc1( 0qt angular velocity of 2.0 rad/s about a ver9xc7a1; vqik.u(tss gv0 c 5(mmcza1p tical 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 -c5p9c wbk tw 8;ebkw:y)qr*lross-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 100y wl 9e/52kiza u6gh*r 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 rectangul0 (l yfesd5ptl k9(q6jar loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is peey k96d0t pjlqfs ((l5rpendicular 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 , dvo6kv+,kgatjj syw+q.d - 0of 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 stzgpgd2+9x4olw 8,. ,kigt rwith an output of 12 V maximum 2ptwid8t zl,,9rk.gxsg g4+owhen rotated at 60 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 generator 3+s7 7cmu gwxwwith 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 6.00 -yyem: 8-wtynj wb.d,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 motobj xd/vs:.k4pf 2b:)vuis 3jmr have a resistance of 6.00 W. The motor operates on 120 V AC, and when runn /bpjx vbk: vfd:24i)3smj.s uing 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./ng e )s,n6qek0 W is connected to a 24-V power supply. The operating current is ne6 egqsk/ ),n1.0 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 zu4gu i/so g ismca41(u65 m+wconnected to a 24-V power supply. The operating current is 1.0 A at full speed. Whou /5a4g4s+cw6ugi muz( 1ms iat 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 conneffzq+r cul)r 7d*3 hm-cted to a 24-V power supply. The operating cuduf+ fhrzlmr-7) 3*q crrent is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltage of enwx4 f( .4oaon-f:ut3t:zws+apox3 $120 \; V$ 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 50 a2l:jmg;ip oylq7ma transformer causes 14 A to flow in the secondary. How many turns mlmypaj; 5oq2:li 07gare 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 prim9 qh chki 9 q4ufw7+augw0(s.yary if the 24-V secondary has 100+hyq .iq9gw haws(940ku7f c u 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-turn secon5jh96vq9pn yyy)n, lmdary coil. If the current p59 nl,jm qy)yhyn96vin the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the3b4 gy+8kri ws primary of a transformer. Assuming 100% efficiency, how many k84rbws g3+y iamps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7dude/q 2(bo; y500 V at 10.0 mA. The primary coil operates on 120 V. What does thq;(byed d/o 2ue primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its sec)jpqh dpq(s2rgo5 ,;/ry-h ycondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is p (2r q5)yg,;op-chdq/y sprjh resent 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 hqemi4 :ob* ax 4z p:ezv(qmt1:v7elp0as 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied tb a :ep: qx*m0 iq1lp(m4ezevovz47: 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 200 tur3sj i -xows(9kns. If the input current at the primary is 100 (w -j s3ok9sixA, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a tranc6apin. l(0qi sformer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect ti lc(6.n a0qiphe 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 ha d(u4p9ijpv(nb na-9,eu hkb )s 100 turns and its secondary has 200 turns. If the power input to the primary is 1(k 94 9bnhijpape )-(udbnu,v00 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 kj 2m,n:;cr5jw m aa 3w5 1yn( l:qbwrhwsw1y060 A of current 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 secowkq1bc w 55,w majam;(r:y rjw n h1:y23wlns0ndary 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 rc /wemfm.5u ) )xp skczw1j/6V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resi156 wx/)szp mcemj.rf wu/ )ckstance 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 usu(0gktase 7q2trv60z t ally 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 voltaq206segvtrtzk0 7a ( tge 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.he/lfdu/ )n*ufl c63g 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 oric )n6fl*ueh 3lf/d/ugginal 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 2kq05 9pazl yk m7j7zoof 0.60 W. A generator produces 100 V at 70 A. In order to reduce ene7k zzk0ql79 oa5mj yp2rgy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-Wfybo a*j*zk q 8/s5tna(2:df b line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V insteaoabqs5ajf b:tn f*k2/dy8 z*(d 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 20c.kfuc q0dnr s(frxe/r :3q+nln, 8x1 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exclxn: +nrxq k8 duc0 /e1s3rrcqf.nf(,eed 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 udwj v.1b7/ +zou -lqxmuch energy is stored in the coil's magb w1.lx-q/ u+o7jduzvnetic 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 res1(,)dtowliq f.o2f jt3 r6jyw istor and an 18-H inductor. What is this circuit jw( y2 tfjlq1.rfo, )63ditow'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 cie;6)4z qfj smxfnbjq : rcq.30rcuit 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 thywy7 z3-nb+ nge 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 intox:rzdi ,/wzx(-i;lc j a 120-V AC outlet. What is the resistance of the laz-x;dzx(ci,wrjl / i: mp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peaks qpqd4e kmk3as4; q-1 current through the resistor;-e3s kqk41qs4qmad p ?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power suppla*5u tsoxo1drh) dlq+ 8 ;-rrqy. What is the power dissipated in the resistor? or)dx ldru *rs8q-o5;+q1h ta

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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 resisto,zw5 mtvvoi5ol. 5q*r r 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 jiebu7, 6lf--ucg+w)kd xpm, 9f7zd ba 50-W resistor 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 5 vi(a,na+ y6za0-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 of a 1.0-mH it2. kunz9jpn0ol*j7 *sb7 d kvnductor 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 +q 6(;ot 3hv6f) nojgm;uzhca 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 1wl2ozaci6oq4a 0j2 yl oqm1 s*b9l b/f e.xa)04.0 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 fo xrdmf 4fukr*un 89y+.r 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 kHz is s.4mu)/qw0zl0wr kvbf0fi * x appliefws r.xkzv0 f0wqlu 0ibm/*4)d 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 cvcy( f uzg;xph g9(bt2mr*uxrv /,7u/oil 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 a 4.7 da,c6vyb:8js-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 Wnk4,zk ywo 3o/j:nc;j 1 :xpry 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 cxh+ :b0 ang(rfapacitor have 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 0.010-mF capacid-9)jz/,xivuiqh(r3f nygxg.xe7q 3tor be 100 W? 7z x (.ynd9g3 x)/jg-huqxivie,q3rf

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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 a3(cegp2k vk,7-t u+xo;mdb n rnd 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.0 Wikk lw.q+md)bo m((8v inductive reactance, and +d( lowmqvki(8.mkb )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 b g) gu2t+x/0( odwim:fw7le xat 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in sere7f+iwld:x/)xt0(bug o gm2wies?

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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 atq-6mvyyh6on a /r)-5.hlmdj,s(seht 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connect.6jm ,nr6m-s lohv (e y5h)sya d-/qthed 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 wimgwu1020b8-em khwm hth a 20-mH inductor, what is the impedance at 1000 Hzm1mgw 8m20w -uek0 hbh?

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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 conz-9(6ve(kbues r xi +bnected in series with a 20-mH inductor, what is the phase angle at 1(v 6x ebu9ezbs-(r +ik000 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 1.0fsgd)86 s4dxqh i s)9y-mF capacitor for a total impedance of 100 W ) s6dysg)ifq4 9d h8xsat 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 capa -p:rkj elg4*6yb8ugo.e5e puqua( r *citances is needed in series with a 100-W resistor and 15-mH coil to get j.e4orkep(6qy ueg*abg5pl ruu8*- :a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put gq-rty, m-.xain series with a 450-mH inductor at 5000 Hz for a total impedance of 40000axmgy-q.- , tr 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 mpwhg/l 4u27p, t2bei be put in series with a 100-kW resistor at 1.0-MHz for a total immul p iwe,27ht p/2b4gpedance 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 conn4p o 1; rzejiq3o64vq8ht w,oyected in series with a 20-mF capacitor. What is the impedancoh1rovyiq p, te;z38q4wo 64je at 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 c zpt8 fj28k9tcapacitor at 1.0 kHz for a total impedtfcz9k t8p2 j8ance 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 sericfr 6j-sig9oq, jd7pg:vo 21d es with a 10-mF capacitor at 1.0 kHz for a phase anglevdg fq 6i 1j2j,d go7-9pso:rc 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 jfg8 ,.(juz,xtzn(rq d)cf:n1.0 kHz for a total impedance of 45:c(z8z,(xd. ) ,jgrfqjf nnut W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capaciid813xq.id7uyt gpb7 r )kle9tor at 120 Hz. What is the phase aliy bddr73 t k.i89e)q xgp17ungle?

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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 andyzw1 0 w-twhd; 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capaci hwz1wt;-d yw0tor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, aaz:dxqt*;g +na. / igi ;2nphzt:xv k5 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 1:vzi qg:n .+; *tdkaaizgn2 h xtx/p5;20-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 qe)n zlt t (w36t4q4 -fq1spvereactance 30 W, and an inductor of ind(q)tf ez p v4s1ttn-4 ew3l6qquctive 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 anglel.b wk/7lptg9 for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz powet7lg.9 kpl/bwr 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 forbe *m- f5 kybs/gy/) 1hff;jal a phase angle o yf;m fbkh *5sf-bg/ay1 e)j/lf $40^{\circ}$ 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 xnk82-d/ehlwdq b2 k1= 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven ixq-8h w kbdd/1ke2ln2n 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 ress((tkumm. bfd+ :ps ,un- uasab:is0)istance, 15.0 W bs+fs)an u(a- s 0tu k:dm,i: (.pmsbuinductive reactance, 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 ACspd0megk8i* ,1i fbm( 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 g9 9 aarbjz+x(30 W. What is the poweb xrj+9 azg9a(r 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 fxcc5k y -2bcw15b cnas48poq+or 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 p55qbk82wcbac+op cn -cys1x4ower 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 an1,)tslh .qzhg:uzd- lfjaz/;d a 15-mH coil in series?)qjah1h , ;.:t- lzfzsg uzdl/

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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.kox f2(fsk4 v97-mF capacitor for a resonant frequfks( 2oxv9kf4ency 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-m ig5kn3br0jg 2o a-yzfb)t s2)H inductor for a resonant frequency of 1000 gz b2s)rjnbf ig3yat o20k5-)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 wit+(m v((afb4u4,j bk2l1j mm xo*vataxh a 30-W resistor and a 40-mH coil4bf l21mjm+ xavvabk4a(*(t,(umj o x if the resonant frequency of the circuit is to be 1000 Hz?

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