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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 magne)rvbuij0.m cl/8 nkoam. 2q 0ttic 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 ln adae6,ugncn5*2 )kthe $emf$ 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 oq)la*.(z )xnlbue*h g f wire in a coil produces what kind of change on t. b*e)z)unq*g (xallh he induced $emf$, 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 fiel7q (*omyv. r81nn3wos pd)adsyzie.;d through a loop of wire produces what kind of change on thws7d.d e(z mqn3a*r;syyo8i on)1p. ve 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*hmrv s0hg-g7 loop of wire produces what kind of change on the induced 7g sh-rv ghm0*$emf$, 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 n 9r2jf l4:h(r/r wfklp6q pt*a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an indu k1+2hm3wmkoxmelz- ),r7tr9q/ u q h:f7xpmnced current in a conductor will be that which tends to produce which o/ ) mk,xn7x-pm9mlwr7fhe mr3tq2uo: qkz 1+ hf 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 ta*+tnb/lsrje5y hf8 son83st1 ble. A bar magnet is held above its center with its north horn j3sl1n8/esb 5tt*+syf8 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 i b* q1d4+mvhpr5,sp dcts center with its north pole pointing down, pr4 b,vd1*d5s hp+qcmand released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the mao snui-a7 ,y yv4fwk0+gnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the ses vi-a4yf70wo,ky+ nunse 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 the86t /shx4aoje +yc 3jt magnetic field vector points strt/tcox ja48 hy +63ejsaight 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 horizontal table top in a region where the magnetic 9n,kf vxk. 7nsx;s uz6w3z*n cfield points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced n*k9fnzxcs s7uk;.,v wnx6 3zcurrent in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasing cla+yj 1.ipryai /:)v v rf(5dpmb9s )wurrent northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circlim9(y. /)i:f1dp+ rjs b)a v vywa5lrpes

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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 thebvrdm +;m)w t- north pole entering first. As the north pole enters the wire, the induced current will be (as viewed from abvdtb)m;wrm -+ ove)

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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 anguh/+su n/ ot7yglt) m;ular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points str;7y /mgtl+ht /nuso )uaight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about(dfdgx2q(o 9* nd x1wg an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what d(n( qgdfx2 1d*9o gxwmust 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.+zg7-qoak 4xgwb+svfz*zz81 t dq h08
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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 c ir/vsbpig co(3 i5g7g;8 *f2s++iox0hb fz jan $emf$ 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 field. The ) *qaqxvbn91h$emf$ 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:py. /opbw5ldax w1f . in the east-west direction) is moved northward at con/1.lw.d wppoy:x abf5 stant 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 co89onq (cpbi8)5)fism0 qm. q c2metj snstant 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 transformst ksm *cqro y2kca73-3

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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 throeyi5.8q+y2lxu c r6e n9jez6augh 60 revolutions each second. The frequency of the5ayx.9 ej8n6l euzi rcqy+6e2 $emf$ 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 usedgv myd2 xd*bez 9)w(9j 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 dw w)yo7u gn4a9evice 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 thany2()f-bwmh hk the primary coil then it isfm 2khwybh-() 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 containsg f(n mzoi)h2, more loops than the secondary coil then it is nfigzm, o)(h2a

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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 p: jy6a:,mqgp6gm ji;h ower 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 circuitj.hw c p*(v1hju:j 5ix,

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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 inducto5gw. e, mdbr79b0 urtjr are connected in series to an ideal battery of constant terminal voltage. At the moment contact is mab.7rtdrw, 5je9b ug0m de with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal bjn3) n0sn7a5r dhc1c- .elzgmattery of constant terminal voltage.n - .1)0 d7mlg3cesach 5jrnnz At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resisexkw 2*:;a s:*uy+gmi a7jj-ao ix ua+tance 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 is connected to:ofv 40ilr5,1d8de w: weetro 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 babbi lvv83z ) tlskh2n u45j8*kk7ygvykb9 ;6dttery. The time constant for the circuit represents the time reb8i7l6j9z2 kv;hb)ynb 5 *kguktk v84dv lsy3quired 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 ce9s +tb0 wmco(onnected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of (09 oc bsem+twthe 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 hbddo08)f(oz f0r lrb ;yv*qm4- s;lhwave 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 ACcc9vot+ v 5i;b power 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 power supply. In thisg*mhbvd 7:xt32blm)e5k) tcr circuit, the currenttg3me5 t)lc)vm dh 7:k2rbb x*

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactanceeukw,9 )dmht ) in an ac circuit changes by what factor when the frequency is tripled?ukm)9 , dtwhe)

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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 vohap(zqvc( y xm()o f69ltage across an inductor is doubled, the inductive reactance of thzx()(c 9f y qmhp6av(oat 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 in15vng6e 86c.sdbfh0nx-lm ng /d( wno ductor approaches zero, the inductive reactance of tha.lnv nhw g0s6 8c-mn5 6/xo(dbdn1ef gt 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 this circuit, the currg9ysy+ 2i a4wwbcsb9 9eb 5wz/ent9ey5b2y 9s/4+az wwbc swg9b i

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what,)t :m9ie0/3gyfm5ksp pnqp f factor when the frequency is tm f:pp5e0 n9st3,g)y/imfpk q ripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage a yo0ykfs7o3l3h1m *fp cross a capacitor approaches zero, the capacitive reactance of t33so1l oh7kmfyfy0 p* hat 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 betwee 85x*k kjh66pq *c( dzguy31d qxhn9kdn the voltages of the inductor and capacitor in a ddzqghup3k*(xk1h 8k 5xyqd *j9 cn66RLC 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 (g a f2my3008 qsf-.bbygsrh 1vxp w4iRLC 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 :df z57 t )q4 ,g1 jpf;jr:zdvq:unjhmif R increases. When is this statemqjnfjd)q ur gf4;,hz:d j5m1v :7:zp tent 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/l ey66r-g 8am )hcvqq 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 circui2g vt+j(y:fr7r s gl/d6:l e,mcajn1ut. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both doubc;ju ikf(9l g;w* d yxa:;w-9ue-th dole in an LRC series circuit, the resowclg9h;jx : dy a;u-d9- *ou ;eifwtk(nant 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. Ac , k(2ac km5tc(puk-u7al 8mit 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 circu(gb.gr:f ;le zit 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 in a un*alqzgz 0j29c s;vv5biform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane ofz0*lva cj9 5b;sgz 2vq 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 untg3 rt;7l ng9zeb7vbm1f fn./ :occ+ piform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magneticn;r:bm lnbz+t /c7.3 v getpoff1g97c 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 a unif4qv 183bcdd,2kv dvc3y mogki h.5 ro:orm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vecto,rvyo c1d4vo8 25 gim.dqb3:3cvkk hdr 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 single loop is reduced from k0ioo)gatlv78+k:c.nz xve ; $1.0 \; m^{2}$ 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 cudox +u0x 3 r7*eh7yqnhanges 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 tura wdu+h q3w wt4rj:8h1ns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average va w twaj8 +dqh4r:wu3h1lue of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and2 1zz3;m y6rswch(1 3uocvz lc 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 andd .v3;ko.jjhgh56le* g n*eor 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 spa5/gvj2uqt9e mn of 60 m flies horizontally at a location where the downward component of the Earth's magne tqj2v/m5gue 9tic 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 rotatzsp8rxl6w 4y4 es at a constant angular velocity of 2.0 rad/s abr6p z4wxs ly48out a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectio3m*wtma/or x: nal 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 1h;1)2,vt (ick)d*ygv-dtbzx j 2 vc rv00 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 it9gb zjc+ ej/3hs 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 ajehzcb/ 39+g j 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 consistssn*mzbd8yggr b /z)1rpbw:(7 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 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 with an output of 1,f(fyzej4 di02 V maximum whfy j4( e0z,difen 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 generator6ne13glbdrr0ig)d u5 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 6.00 W. The motor osvg3bb26 ve,*rh s2 ghperates 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 m4 zbrppl)l, )botor have a resistance of 6.00 W. The motor operates on 120 V AC, and whllpbz)4 p r),ben 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 i)-jf:);j kr:srjmy6yf + dx pis connected to a 24-V power supply. Th :r))+ -fjykjfmx; ydprj:6i se operating current 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 resi + t5-qsd1kmg9ix(ay ustance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. Wydqm kti 5x g1(ua9+-shat 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 suppbk7dmi-rj 366df) a dgly. The operating current is 1.0 A at full speed. Whadb mk6g-j6a3d f7dir) t 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 ivr1 :rq v w7z4qeibc:f 3:;zvwxu54 crs 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 tr8b 1q;suqtj0/n adzj20:w u tsansformer causes 14 A to flow in the secondary. How many turns are j:wjau0d; sttq nuq0zb1s8/2in 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 if av zis99k8 xd3i,sld7the 24-V secondary has 100 t8x k9il9sdv zi37a,d surns?

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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 secondary ct 1y3euh1r*q loil. If the current in the secondary is 3.0 A, what is the current in the primaruy3r1 *t1elh qy?

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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% ev+ ev s4z8k57dq9vaop ,lku*dfficiency, how man7 aq5os *4ld,ke9v+zkv uvp8 dy amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign t* j +4scya3vheransformer provides 7500 V at 10.0 mA. The primary coil operatv3*y4hsj cea+ es 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 transformerdpdm m18ljf1f;c c2v- has 60 turns on its primary coil and 300 turns on its seconddf18vp;fj-dm 1lmcc2ary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil andwse bg1.4xhk; mosrt:cxi237k ,i kp* 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, wh7 1g:.iecxkpw, *s hkks or2;43xtbimat 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 xn fg1w 1p1h+4gqrr3h 100 turns and its secondary has 200 turns. If the input current pggnq31 xr4hf1w r1h+at the primary is 100 A, 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 transformer has 100 t-zhw.7dg 0r jturns and its secondary has 200 turns. If hzg t0w.-7rj dthe input voltage to 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 secondary has 200 turns. 4ockpg5k,3 dvc/fb t4If the power input to the primary is 100 W, we can expect the power output of the secondary to bk 4vfp5/34ob gtc,kcd e (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 stnfru 49dif07 vepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turn94urv i7f fdn0s in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepp5ju+ md fqi;-51 aag;mx4yef wed up to 4500 V by a transformer and transmitted through a power line of w gau4xda;m1f -;eyifj5 m5 q+total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A3 e*x4n y:fokyegn(l2p (w7v3z qnfb 1 of current at 120 V. The voltage is usually stepped up to 4500 V by a egno 3(fynp nyx(f : 2bek47vw1* zql3transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. ysn cfo61 oq8.A generator produces 100 V at 70 A. In order to reduce energy loss due .6yq8c nof s1oto 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 of 0.60 W. A gen9f b9ks8nm c-derator 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 radb9s m nfc-9k8tio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power wot:l0 ,w9wd aub2 oj/zuuld be lost if the power were transmitted at 3000 V intzu9 ,dww0ljb ou a/:2stead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on ajoo 3aza n,2hy 7d(g)m line with resistance of 0.60 W. To what voltage must the generator output be steppeya)2 d o7oamj(,g zn3hd 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;4bng5zayj 9yf2 -u rg a current of 5.0 A. How much energy is stored in the coil's magnetic fieabf ug;54zn2y r-gj 9yld?

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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 i5 t6h0 5/nghc.9 xr8kqxrpdg.0-W resistor and an 18-H inductor. What is this circuit's time const/68di.hgpr5xxk9 5ngrcqh0tant?

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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 6) 46x+jrco)uszkt11 hevpyoin an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is thzz3o*8r4p (0 pvv xtjxe peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 1nlr8zya ..+ac p8tv p820-V AC outlet. What is the resistance of the la tyrap8a+z.l.88v pcnmp?

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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 connengyo wi(wg8 q833 wiw1lmva. ;cted to a 120-V ac power supply. What is the peak current througy8w3 lon(miggq.a 38vwww i1; h the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supf9.i4x scie2 jk aro:0ply. What is the power dissipated in ta4r x0ck2 j.9efsi o:ihe 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 resistor vk 9 7wy8tf;kuis $I = 0.80 \sin (240 t)$. 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 hep7yb3+s wl( vg)1yxresistor 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 resistowd7 2q p:-etr-b m67iwpjq5e pr 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.vajz9sh b*r q6cd8k9jq. y1(k0-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 inductivet f2d:x5-1vpgd) gdwmd c9s5x reactance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of indlg5 s)khc0,n :hmcp b+uctive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance ac e(qfq* l0xg7 qti8i gl(q5i9t 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 ehe 2.d2to3d wat a frequency of 20 kHz is applied2et3w.edho2d to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 127db 0 z8szmbn-g dk;.klhph- 10-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-mF capacitor a4xw av,e/ig2tt 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:mv :ly0mf 2swox4o/ n 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does 3 ecs.v9j:nnc a 10-mF capacitor 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 capacitor bte ,haw+ ki7*qe 100 W?hk7e i,tq*w+ a

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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. o:qr+bo9 uxh :;)upnf0 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 wpbc20-.apa/i +ooo63r/ yhte f sl n1resistance, 15.0 W inductive reactance, and hs.o 1wtib -3 cre pay6pl02fn//oa+o10.0 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 4uzpte,4klp 0Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are clp 4p4zeku,t 0onnected 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 resisto/uv.w m64ubg4 :brjejr, 20-mH coil, and 1.0-mF capa4b46 rg muv .:ubjejw/citor 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, whaa2w-/+s:o js- am9r ar6vs xlvt is the i2sjm-ax6-r orawl s:v a+sv9/mpedance 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 m8 5v(i ql-sra dm )bh1d88cig)wg7ol series with a 20-mH inductor, what is the pha)mhd5b)1ql-(g i87im8s l8 god vawcrse angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit wifr.h7hqa rh k4vf/6.dlx t0+bth a 20-mH coil and 1.0-mF capacitor for a total impedance o4dhr+. k 0q.lh/6fab7vhftx rf 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is neede)d+ di-b i3wlnyeas2)dh:orx82 ( lxjd in series with a 100-W resistor and 15-mH coil to get a total impedanbhs j 3i +())ndr oed8-iayxlxw:2d 2lce 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 450-mHkwx h;)6;5gcsqtk p1 a inductor at 5000 Hz for a total impedance of 4005;x)s ;t6kkwh qa cgp100 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW bos9ps,auw6u l *p 5:xresistor at 1.0-MHz for a total impeup*lox6,9p5swsb : uadance 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 4ra xib9px g93k :a9qyj6zn:hthe impedance at hayx4 39:9pgzxkqji:bnra69 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 sen1,)g qlmskp y i ur54t);r(pcries with a 10-mF capacitor at 1.0 kHz for a total imps5lmg4t (, cr qi)unp1p);k ryedance 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* c1x t- okznii1ve91h in series with a 10-mF capacitor at 1.0 kHz for a phase ang1hot9kx cn1*z1-e i vile 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 3:o p6f4k*lpm1zd k kd20-W resistor at 1.0 kHz for a total impedap* ozl:kd1d6kmf4k2pnce of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacit)v7hivn2/ a0b5lf yllwzs+e +or at 120 Hz. What is the phase ang+0h fw5lbs 7nizv l)e2v ly/+ale?

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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 10 zz3 *8*fs ya0d)noxqt0-W resistor, 20-mH coil, and 1.0-mF casqzz8oynx) d0* fa3t*pacitor 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, a 10.0-mF capacitor2 fq2s 4*yemef, and a 0.350-H inductor. The circuit isq2fsf*e em42 y 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 capacit 8jis76pncf 9b4 ykm;.tq9 ceeor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are conne7ee9ynq89.s k fp4icm t;6j cbcted 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:jg4vkyv d * 1gievl ,-d7ak5m for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.d v*,g7kgv5iejl 41-dak: v my45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary 8sxxy/) ,625ki l +tzykvbta:n h *xinin series with a 500-W resistor for a phase angle ox5 2nxakt,/zs)nvyyx6*lti hibk+ 8:f $40^{\circ}$ 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 what frequen ny4ptt199ndkcy should the circuit be driven in orddpnk 4yn 99tt1er 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 wbt)b h:tc95wrv+a6 nf n3(zp.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive re6tcbzaph9rvb (:w3 w n5) tn+factance, 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 AC circa89/ dww-z lntuit 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 u.zp/oq-j6ib/w0n4 i c9b z od)j ;loxa resistance of 30 W. What is the power fi j;)qcul b0in/o /o4p xoz z9.-6bwdjactor?

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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 RLC circuit containing a 50-W resistd8b **icwnahv97 5k ldor, a 10-mF capacitod7a9kbv w lhci*5*8ndr, and a 0.45-H inductor, 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 seriq ua;-ulknl/d..y:p3udi x, res?d: u;d.r nua-lx u, klyp/qi3.

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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 capacitor for a resonant frequ -a)x-(d oen/zj jav/pe-)spzency of 10 kHz?sxz) ndavj-(jpe z) /p/e o--a

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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 wigjcqswh 9y cr4cea0 d2au97*/th a 3.7-mH inductor for a resonant frequency of 1000 Hz?2 /9r0s*uacd gwcya79j4 qhc e

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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 scqwpxk.; 2+f a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 Hksqf+p;cw x 2.z?

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