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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: 游客未登录  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 wcy 7--aj,daa:tn;2tvf by7punits of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction stat,zra kf50v67 yafhb w;es that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind 1u 2uk/mdmb1e6pio9mg7 2g b drtz,j)5uwa e6of change on the inducedr z5uijewdo 6g)a ek,t 27d1b6u pu/mm91bmg2 $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire px47qfsa)5wu0a+q mhyih ;; u uroduces what kind of change on the indu;iauqq;7au 4h)xs5 +f yhm0wuced $emf$, 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 prco r*qm+i( v)a, u6keuoduces what kind of change on the induo*vuq(+ 6e)ika,murc ced $emf$, 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 a4j 5vth ygi 8 jura:4h.9y*,rl-s gypu 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 directi.vkeanpc*di,3 tk.g 4x kn2 f,on of an induced current in a conductor will be that which tends to produce which of the followin,.at2k4kgp*dfie .cvn3nkx , g 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.l74c j v 4)- aut,kkhzl02obie A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from ke7tcz h)a 2 0-lokjvu4i,l4b 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 bavnkbco(e) 55a052l 7g m, r*,rcofgpreb 3lyvr magnet is held above its center with its north pole pointing down, and released. As it appral,)y5m,ev b lc( b gokrnfo755cr rv3e*g02poaches 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 manl a h143rsy;jgnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fadel4srnjy3 ah; 1s?

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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 aps s 13-wj qooh7 dp.s hjzu2t/iw4+-p region where the magnetic field vector points straight up. The magneo.ppdsww7h h jz/ tsijops+ 2qu1-34-tic 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 thsor5 e m6zsq w4:26gwpe magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the directio:r26 e4zsw6wqgospm5 n of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizop/xas)y zwdb9xron9tq+4fj) d j9 ( v+ntal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circlesoyrs4d)d+z /q)a9x x9jpt v(fwn+ j9b

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north polbv1 ptgk lxb g5,4y+m+e entering first. As the north pole enters the wire,gp l41bb,+ gxvtykm5+ 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 consta(oa2n9g9i:x3xlmz zhgu -ic (nt angular speed about an axis whose direction can be varied. In a region where a uniform magneti3 gx2 ci(9o ihg -xzzumlna(:9c field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constannh;8vj*a hnsqxwr r2 c/w-z(nb 1gg53t 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 onh- a*n v(q 1rscjz/ 5x 38nh;rwgbg2wf 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.z da58u+-zf kjk*lkj8
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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 th,-var -ixl:qp enszn1dza -2 7at 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 field. Tfakf; ,y/bg7jq / 2w 8monn-izhe $emf$ 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 .dc;7t f5/yqkp;sjd yl( sojof -75 kceast-west direction) is moved northward at constant velocity tkdj sfo57 stcl/.;p;yf-( 7okjd5 yqc hrough 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 velocityj 4(6gmz/x/giskreh 8 e -t 0hkp4xzp7 $\omega$ 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 transfp8 j2y39xuxm0g v44-zsfr xhtorms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frest79n yk,gio kf+9 pc;quency of the 9osgp cf9,;ikk t+7ny$emf$ 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 dt ;nsnrq 2)x*q98.qsfm * omuqevice 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 device thau wrt s1 p1d, ay7px/x.9-7p zn,peiuut

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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 s4 2m,o9vny8 yxe2d ascontains more loops than the primary coil then it is ayssx982y4d emvn, 2a o

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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 mowl8n4 gye6 mfy-7ra z6sbx -dgn2vs5 (re loops than the secondary coi sdlwy4( 5n2-6zr- xggmv e8yas76 bfnl 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 power i;gcxmotzgs 9g- (2i5u nput

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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 ac1lyudkao+/n fpf5 :5:c zc/circuit,

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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 induct2*y;kicyz ok0kv685d5 zasd z :kwitj/:lzt0or are connected in series to an ideal battery of constant terminal voltage. At the moment contact is ma:zs/z k o zkcj v0ld;a2yz0*6y5ti w8kd5:tkide 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 th+t6;ke(m wpqiq -0qho an ideal battery of constant terminal voltage. At the moment contact is made with the battery, th-kth h(qeq0i+p w6m; qe 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 resistance Rg2.; dk*jc )xej)w zpfe,9qsfn38cwi 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 connecte964egwea7tn1;5 q kddsf5cn od 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 conne7xnq sm e*p r8)-dyrb+un6sk 5cted in series to a battery. The time constant for the circuit represents the time required for the current to b87n6r5 nxsk umsyq p-*rd)+ereach

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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 connecte*v4 sfn(mwhdhv., cz;d in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the hzdsmw ;f.ch , (v*nv4current 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 r5y 4 qag:ejnmzlh.),e-ve .rsame 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 auu/9mva 52p h;pn27o qpmoa(o1vbu i)n AC 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 connectq * 7 *kz8nlzv9za(iim7 wpsz3ed to an AC power supply. In this circuit, the curren8vizwp*a iqm3 kz77n* zlz( s9t

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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 what factor when the fre bdfbkr; uww5g-r:4j*lqn2t 7 quency isl*d jfqbk:;tb4w g -527rwunr tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across at ) ls/h 0hlssdpld6si9ap.7k)+ ix0kn inductor is doubled, the inductive reacta+pkskhtd 0s .x9lil )l a/pds0)i7 s6hnce 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 acu3h-4p kw d)pmross an inductor approaches zero, the inductive rk4- d p3hmwu)peactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC p nwpm-9uin7kcdjq2 mp7;d4db+lp-/ y ower supply. In this circuit, the currently+bpdwudi/ -m 79c-n;j qp 4m2k7dpn

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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 circuiqc3j u;p wjbf,ave38 4t changes by what factor when the freque8 uqf;w jj3 vcbe34ap,ncy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the x6ayblx x*gtm ;a -; y*s:l rbe-si+(nAC voltage across a capacitor approaches zero, the capacitive reacm6 a*l;eag- ;+ ls:(ibxy* yxxtnbr-s tance 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 the voltages of t/,mq0 cmw/ w+w*mcjeotwk3 1jhe inductor and capacitor in a RLC series cirqw/0cm eo wtwmjc+k*/mwj3, 1 cuit?

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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 aea3hrary* yjt+b* 6we9c; ,nu5b o ll+ p-ts8jn RLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R increasesq+xovqy;gzo qhq9vx; s: 3 2f4. When is this statement trueqf v3+y;9 :gxvq2hs4oqqo zx;?

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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. ts 9+p4g4szpl 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 tirkmqh8lky1)fliy *25: 8mz70ip+ yrfz 2 xin he 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 iwkrbdg.p + )t.n an LRC series circuit, the resong.pbr+.w )dktant 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 v9 zoxw(,/s cm/e/qcs woltage. 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 RLi9:yima14u(dtim : lv C circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius rbm o:5f3l/69yfj -ti6ptb fv 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux65ltmrf9vj3 6t y:o- f pb/bif through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform m xlifthoh7z 53n(: vc9agnetic field of 0.20 T. Find the magnetic flux through the looc3hf5 vl o(7znih:tx 9p when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a unifr8pk z1utakv w+j*c +:orm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vectoruc* 1:zrwvtkj 8p++ak 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 a 4eyv 2au5w**)bkb5 ivx/sej cdjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes fromqli y.u uo2 m3o4fg e+234yzi+gq 6iol $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a sq/2ry;1s 7a ozxiqlr-luare 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 value o2q 1ozxi 7lrlsy/ ar;-f 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 b.u 5 mo 3cs74 m :iuis6htt9jgb2buk7with 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 ar;ow kv8ui91nwpd +1+k u gj0rsea $0.20 \; m^{2}$ 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 flstqf7 jn v(8ezf2ra--ies horizontally at a location where the downward componesjf7 8a-fn(r-2qvet z nt 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 r*eymyy9 9l1tlu (y2.x2paav r otates at a constant angular velocity of 2..pr * ty(l21 l2x9a9yyave yum0 rad/s about 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-sectiona x5mhjj8 rcy*(l area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of ij 4k+l0n,mfaarea $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature.f-ni psjrb7a.0d12,qb + faga 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 perpendicular to the axis of rotation, what will be th+fafq s-igab.,p0jna17rb2 d e 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 3x4 gp5 -h4*x-cpv*rbln g ava100 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 generaton 9hcplrb1 e-; nt.41t:h jrhcsg+ pt2r with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. Ijtn pb -c .hc2 hglntesr:;+9rh11t4p f 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 maximv s((xt 2;pxlqum $emf$ 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 haverws ,f31sc t)c a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistanhd .fi tbz wk.zat9*o* n(k3x6ce of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a bacawk*dt .6 xo9z*zfk(ti .b nh3k $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. lxrjl7*lalai 6f92 ;x The operating current is 1.0 ll; l 9a2fj7* liarxx6A. 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 to a 24-V power supplyek 5c 4eukl8:w .w9vsy. The operating current is 1.0 A ac5.w984k uev swyle:k t 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 is4 m 8-hhwa7f wskqvf+qg6 g3so0p7oz ( connected to a 24-V power supply. The operating current 4 w m0z3 h(o+8v7sw7 p 6afo-hggqqskfis 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 reduce59h-j,:kqhr hz-yp w n7e wl02 wvp2yf a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to :+5ch 2bqss xaflow in the secondary. How many turns are in the secondq a :sb+5shcx2ary?

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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-v8 m ki/yu .i ki;btgq0rmp3bsrc(lm 8 .o9,l*V primary if the 24-V secondary hasyimli9burm.. (lp 03gm8*i 8;vcrbo/kqkts, 100 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 8 4rgznw d;r(osxhu.4 primary coil and a 2000-turn secondary coil. If the current in the secondarysr d.x 4n;4ouwrg(hz8 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 ind/7b6i4( hfsz 5s2 t; vyfbrom the primary of a transformer. Assuming 100% efficiency, hoif r2vftbs5/zdm ;h7b y46s(ow many 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 7utr(9khkq9zv5jf 8 a a neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does thet ( kuh85qk 9v9ajzr7f 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 it /lu,;dm 4s3t n qy26 nz,i1n vglmm7ky2-eukys secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is pre-uyd/i n62,4gm m ,nvskmly2zl;qkunt e3y 17sent 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 ha5ju3z+e0(f +ezz qw dh1xls*afmj* i8 s 60 turns on its primary coil and 300 turns on its secondary coil. If 120 Vjz fl izwu3a0+(zqfhmes*j8d1 *5+ex 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 200 turns. Ifc7k3/ohqpt22r-hf f y,)sd2 pxt r a.a the input current at the p -d2 fqcp ft,x2 s)hy.27r atark/poh3rimary 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 turns and its secondary has 2gl3)ko3/r1k g5 bhbjz00 turns. If the input voltage to the primary ikko51g b/lbgj3h3 r )zs 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 af1tf i;royu -hgoq/ xv5t1.m:nd its secondary has 200 turns. If the :;1yh-t.of/ ut1xi mv q orgf5power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The v1mq9: ii 6psk-:v bouirs +de8oltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the nuiq emip1i:ds 8 bv:k 6+9ur-osmber of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usualji9zse:5me bx48oevgp933 dply stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage pvd35emjzs8o g:ieep9 b4 9x3 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 usually sted. vlb ppj8n5*-mf(n vpped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 Wjv ( n 8-*dbmnpvlp5.f. 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. A generjw4r vk+b1qa;y)h g p lgqm)n,;bc97wator produces 100 V at 70 A. In omj,q w)1ab;;wq)c rpk7g+g v l4hb9ynrder 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 /qzc0dnpi7yf,g+i s / 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce gp/sndc7i0 f,yq/i+z 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 a 6-W line at 1000 V. How much leymkq v 7-r ed(5y7tq)dss power would be lost if the powqdtd7vmk)e5 q- (ryy7 er were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be tw kx73gt+( q)uht1nstransmitted 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 (7+x qshk w)ttn13gutto 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 coji+ei1 z(,- ii ykxuj*g0 se px65q3bvil's magnetic fiel esjy p -6,1u3eii+iz05vj* xkqx(gbid?

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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 18-8i1lm: g xj u+ibiu31fH inductor. What is this x18lbufg i13ii+m j :ucircuit'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 circuit where the rms voltage isro8i( jy3sz* o 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 currz sk*cmizc +6/ nb+kv-ent?

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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 zwvuic,o x,11 into a 120-V AC outlet. What is the resistance of the lamc1xo,wi 1v ,uzp?

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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 9em0 yypj/1mx x0d v6ea 120-V ac power supply. What is the peak current through the/j1vxedy09 mye6pm 0x 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 supny qq7x 7fd) /2sof7,7glex9e vao9jl ply. What is the power dissipated in the resisa/,fqvo9l 77 s2e7yqg)n7 lx9oejdf xtor?

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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 iwd303k 2nk2dgs/ppq4g s)rumc w:6 kcs $I = 0.80 \sin (240 t)$. 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 resistor is zo+ugwr + rz)t6wphh 7.,wg) g$I = 0.80 \sin (240 t)$. 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 resisvrb/ cp2hhrfs:8lirqf :9 *;etor 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 az;e: raqh-c0ap 256zii ogts/ 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance ):sez m5s-e * rj4uiieof 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 inductive reactanqpk/ek gce6qe38s9l p4w1:gv ce?

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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 o7 /t,fxvn z4g56+i efyrd8 xvef 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 freq .;y+rhpxry+vuk/nd aw), 0yvuency of 20 kHz is applied to it;0 n)+.,hv pv+yxurda/w ykry ?

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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 coq 8:g2j-m sbd4o6e yxfil 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 ofesk pi1tr9 3un1kh6 f* 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 capacitive reactance at 10 kHzr5:w9ud,/w) cp,mbvoywt l 5z?

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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 reactancx-p6ysciggl2h 6qc 4 0e 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 capacw8 xub lrdfi nv3/6-pewz1-d 7itive reactance of a 0.010-mF capacitor be 100 W zib7v-dpx83 ufrw l1d/n6e-w?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 5.0 V?t l,vv (ir0mgsd2 io(37w;auv

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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 wit rzl t:c.3+ifzlqk6:ih 12.0 W resistance, 15.0 W inductive reactance, anqlz:l 3 i.c6zr +tfk:id 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH i0qfehe-so) ,coil, and 1.0-mF cqfeo 0 ish,-)eapacitor 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 k4mw)6n3amk0heu k5l r 6dfk. 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connecrw3k.n6l0dk hk me f)a 4k56muted 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 wdhmfyq4 7 2 h*dn5j5ra 20-mH inductor, what is the impedance at 1000 y4ddm2hjf7 *q5nw 5 rhHz?

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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 inductor, what :,rgp868h.q j9v dn7 fqfbvlfis the phase angle at 10798hn vbfl fd,f6vjp:grq. q800 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 1.0-mF guuvdrf-y a1mkq, ,,/capacitor for a total impedance of 100 W at 1500,, fa1vkugdy-,m rq u/ 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 sp9 ,wlc eqv0/teries with a 100-W resistor and 15-mH coil to get a total imtpc9w/ 0,le vqpedance 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-mH ig-m+v w 2+qk a79vtstbnductor at 5000 Hz for a total impedance of 40000 W2sw7 +v+ qatb9mt- gkv?

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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 resist1xm ;:htxs,b8r lw3a ior at 1.0-MHz for a total imped :brsx8xmw; 1il, tha3ance 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-:u *51.ce:lbxq e rqsgmF capacitor. What is the impedance at 1e.c eg51sq:rbl u:x *q000 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 foe:kpt.uk,bv oh(5 ny-n 9at .lr a total impedance of 45 W?, 5 ven9(l:ukhb n.kt y-oa.tp

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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 caps/4;4h3xa sjje5 f 7citugl(.iody; gacitor at 1.0 kHz for a phase al3eua4yt;jf xs.74i 5(ds ijc/ g;ohgngle 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 ()l;p / ekrlemat 1.0 kHz for a total impedance o) (pr /melkel;f 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 +5 l + 5yirc4-eiohajdz 6qya3series with a 100-mF capacitor at 120 Hz. What is the phase angle?r-5+e jh 3cd5iayq alzyi+o6 4

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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-m4ia xx.-yc5tmH coil, and 1.0-mF capacitor arex.c4at- myi x5 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-mFl xyj ycxd r17*e x(9jvsl).h7 capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in theey xj .)9(7ljx*yxcd 1vslrh7 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 ca25h 9g8hkf;tox6 /q suq1fp d1yj0 ancpacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30/fh1 g520 t fq1osyn9cxka8dh;p6ujq W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circg)a*i- vgyjhe:-m8ls1i.drq1;kcddv +s a. h uit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H indueyqi18:;l d.s i+hkm.c1*vavs-r hgd-gja )dctor, 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 in series with a 500-W resdps6y p,eiv*2r+r b(oistor for a phase angle of bs2ivp edo+ rp6ry( *,$40^{\circ}$ 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 frea) exrik.n9w1 quency should the circuit be driven in order to have maximum power transferrek)xw1i e9rna .d 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 1 j9gsycs) c,i 51d4w 6awm3keg2.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the cirw5yck4e g6)3ig 91sj m ac,dswcuit 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 ,sf6m6 ovnn9v 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 of8f/teb b 3mb5c 30 W. What is t/ce3fb8b 5b mthe 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 RLC circuit containing a 50-W resi/7zlo1h:uv e ifu9p 6bstor, a 10-mF capacitor, and a 0.4h ipo:9zb67 lvfu e/1u5-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 are 5ap q02w/sd 15-mH coil in series? qwr5esd/2p0a

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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 rey/, ukcv ya -qdjkdc/ug6g5056e ye 9usonant frequency of 10 5 9qu/g gdc6 e0yc-jky6 5kyveuau, /dkHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a rneh353t ha q ;erseh9xe5 k4b*esonant frequency of 1000 sqr e43e*hh5x 3te;9nbkeah5Hz?

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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 wiu g44 l ,h+n:zjq/jznith a 30-W resistor and a 40-mH coil if the resonant frequenc: ,4 4hligzn jj+zun/qy of the circuit is to be 1000 Hz?

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