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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flkm hu+y4* hvg lt.+/huux 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 -ql olw08bd*ces 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 w+dr) : k o/pafqq4p;tfw5cpi ;hat kind of change on the inducep; kic/ )p4fdwq ; atf+:poqr5d $emf$, 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 lxp8.8vp: xdpeoop of wire produces what kind of change on the induced p.8:p x8pvedx $emf$, 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 by:oi/h, *z aeinduceay/zie,:*oh bd $emf$, 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 6z7x pdqfz+ nm8xhe7.6s +yk tfrom 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 induced current in aq n1 7ymj;t n,cl5cuxl560jql conductor will be that which tends to pr5um61j0jxqylnt q5,7n ;cc lloduce 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 horizontalkvgxi 9sd:vv8jp4:6 l table. A bar magnet is held above its center with its north pole pointing vgpx:k vs4 vjl8 i:d96down. 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 3q8gj6ws,o/cwqj )ankk 2p +wjl 2 p*von a horizontal table. A bar magnet is held above its center with its north pole pointing down, and releaj +kqjoc,8wgpjl32np 6*w 2vs qw)ka/ sed. 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 u d bm7h(ayt8r4;;dy win a region where the magnetic field vector points straight up.yab4m (d;ur;dhyw8 t7 The magnetic 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 the heb fo-p5r4v +magnetic field vector points straight up. The magnetic field suddenly grehbp4f5o+r- vows 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 horizontul km)ew+ vpz(d3 okwyek /xk2t93f+4al table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil(yw z) kuod4 pxm3 3vfek+kkl/+w9te 2 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 zr zo)s8vl91tand carries an ever-increasing current northw8sz9)r1zvotl ard. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entevw8ki) ad lj a;9rju-t1r2-yz xeb s29ring first. As the north pole enters the wire, the induced current will be (as viewed f-8rzjr tk elxy9;sa- 9)2j1a2d u iwbvrom above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an ax51dud(mrspn5zx f;+ eis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if thdd 5r+f5;px me1zn(use 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 angu ww586s0ja/tw61 av evjavv,r lar speed about an axis whose direction can be varied. In a region where a u avv81jv ,6j ta5ww6vwae0sr/ niform 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.5gxyf l,*)ltp
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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 5z g*r*gs wmf:that 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:rol22qwk hd ; 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 n o1mjgfcb09*akw97wc orthward at constant velocity through a magnetic field that points straight down. Make a stateme w f1wjco7bgck0a99*mnt 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 b0y3r /x)amffw fl56y mar rotates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transforrx ifsova.z1;f.uf)q jbe1jd 8: 6y t/ms

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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 secoq*ub synd/)y ;nd. The frequency of thds/q y;y*b nu)e $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used txius u)o x/s-nlesb-p.04ig ) o

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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 der*s,*y vprpnv 27k+ nx-tywx7:ow 4eqy8lnk/vice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the primad7xk /l.w desc 2kr03yry coil then it 3 w.s dydr72l0/kekcxis 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 more loops than the secondary (8*7yy/p5,ka:mtel3 ufjmnxx ; eeghcoil thenh5:elmy kgpuxet /f(ma8j*,7 ;yn 3xe 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 c zi7p5i10k iainput

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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 circuij0v+awma /yu9kddp6o xl8*7k t,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal bvj( )vnbfiw0(attery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistvfbj(( iwv n)0or 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 ser0 t +kk-ck8cl z6nqxf,ies to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the n8 q +6z kk,-fx0ltcckinductor 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 anf155f8tylnj o d resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and res(6x7ra ty+7 dws8 uo(zva;bgz,p9qii istance 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 lun m(8hwer8;nstant for the circuit represents the time required fh88el wurm;(n or 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 to a ba:4xai5rlqvrce 6 ,5 x/ lfc,xlttery. The battery is suddenly removed from the circuit. The time constant for ofir6ecxlfx: 4 xll,q5 ,ca5 v/r the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following -74jm bjftss(ms+2 s.h1ge z ghave the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuitzf p2 cwi/o*b16r7 4iyee 0jay, 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 this circus0) myhbyhd 0:;z( wohmd(tna y k:*6tit, the currentds0mzy( mn (*h b :hoa0wttkh:y;)d6y

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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 chax 5fy i7xc:-sunges by what factor when the frequenc:y-x5 sc 7ixufy is 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 a(82.yek 2o2mhztv xyc .ltal- n inductor is doubled, the inductive k2.2tlm28ly oaxth.-( vc ze yreactance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductorou88srg/i ;dt approaches zero, the inductive reactance of that c/8rso ;8gdtu ioil

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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 conb*0p 1ji7as1xky fv h0nected to an AC power supply. In this circuit, the currensba0i1y1p v* 7k 0jfxht

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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 factor when the frequeam4 ed,rq(i ez/fvl*3ncy is tripled(iv/, md ezeflr*34qa?

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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)k+ij;f -r ngm across a capacitor approaches zero, the capacitive re-i;fk+ )jgrnm actance 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 the inductor and capacitor ine;,jw35kt8phikb ogso c8, d2 a RLC serie3e;8 t8kochdopi kb jwg2s,,5s 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 c,diru (8p -obpircuit 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 impe9/vtqamzlwprh m p/kqiy.d ; 39-.6umi *z3fhdance of the circuit increases if R increases. When is this statement truemq ;. zw k.myf-6zl/pu3/9iratvmh 9dip3 h q*?

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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 imped agx+9dkseqn7a(k 25dance 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 circuit *k 1oh58o)frar xun5h4*m sht 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 capacitanc9fns 4r*bpxcvd88w )g x2kvn 9e both double in an LRC series circuit, the resonrf2g89*c9 vxpb w8 )n 4dsxvknant 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 tha 8eq/lnra uu ft+6/oa7t is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circugmdlfw +f il3i w+*03j+ pxgppn0f77yit 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 uniform magnetic vj66 z2 v5/y)olb4h,hvnzn f m/x s2fofield of 0.20 T. Find the magnetic flux th fn/vo) zx v2n4lb2oj56yf, z vmh/6shrough 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 ungj c: 8l;n 59wjl1gjaliform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fiej l n19g:cla5l;8 jgwjld 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 uniform magnetic field of 0up6 2j;antwrct* :ix3hk(gu-.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an anu tn*pgwx(i:6c ku-a ; jr3h2tgle 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 fj ,a. ufc.,t(iu ) clyb /c2rkrg2)w jt1gefg5rom $1.0 \; m^{2}$ 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 cyd yd;v8gt8gsg.j)0xx 2l (iqoil changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a squaxox(x/4p7 wtsk d1 i:lrb- wk4re 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 l-x x4twkrikdo:(xp/ 14w7sb8.0 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 wu 0gzx1a 5 (;xe6cnytavk pnyf74m p/4ith 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 area y.ry)bum)1 ng $0.20 \; m^{2}$ 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 wintylrfolrg-3 ) 0 xn2w/g span of 60 m flies horizontally at a location where the downward n 02rl-lxr/y)g3ow tfcomponent 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 constant anguliy wm+) o9 ;dphf.,ncwd5h/g qar velocity of 2.0 rad/s about a vertical axis through one of its ends while in a cons;h hwygpdin)/f, m5.wd9q co+ tant 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 q ea)va8 - k.e8sonu8l)xfki8l 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 o)nwgo;i is6h -f 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 it.+zbu. vbxq: gs 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 perpendicular to the axis of rotation, what will be the maximum output voltage .u+vqx:bg. bz 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 tuxf gn-))jsbz1c vm/z8rns 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 sim us(npsx(9fk1 ple AC generator with an output of 12 V maximum when rotated at 60xs(u9n(fpsk 1 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 generj3 6/rz uy0gpmm,.vd1ebu4seb *j rv8ator 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 operatkoc;96,4;bah ca txi mes on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. Ther)lb;zb6q1q(azp)x5 o6jl ua motor operates on 120 V AC, and wh p6)azl6b5a()lrxu1;jozq bqen running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a y* 5wjnpexo2x1 vqb81 w2-dkp 24-V power supply. The operating current is 8y2 51pp2n vbdxq*ew1kwojx-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 internalsm8 aa7i sf3tw9- tr.y resistance 6.0 W is connected to a 24-V power supply. The operating currenyswi8m7saa- t9.3 rf tt is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is co)6 sukhtcevi,6krlvi1 f*,j(uby3 1s nnected to a 24-V power supply. The operating current is 1.0 A at full speed. Whatuikb 6(u )*ivt,rhfs,1lv 3s1j ckye 6 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 idm:+kj ii4iex7n+el0 s needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer caussuu: bie+ (xx+liqwj 6lgt 70h*lx; f8es 14 A to flow in the secondary. How many turns are in thf+w87:utse*h ;+ l bxjq l(gu06xliix e 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 turnl 7ccl s2i/ r/1igi( )xf5eyjcs are necessary in a 110-V primary if the 24-V secondary has 100 turlj(cx glic /2e)frsi i/75 1cyns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consistf4jf(x-9th cds of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, whhf f dc4jx(-t9at is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% y3jy3gqbo;huugc. +1 efficiency, how many amps at 24 V can flow in the secondary?y;. go+13uchjq3ybg u

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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 l/9 hfjxghza+tl 1*9h/jjk;: m7ic9orzvo8 l transformer provides 7500 V at 10.0 mA. The primary cojjoc 1:f+ hl *o9thkxz9m ;v rhlag z9i78j/l/il operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil andt;317sj hxa i.ligpa , 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the prijia ;7,txs1ahgip3. lmary, 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 2+t(zxngk* bkuwim /6turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary,+6ik b x2n gu(kt*wz/m 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 haw +t03yh2ru h4.thofe+s- l.wyb.p vfs 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the seh.h4 -ep0.t23 fh syul+ftw+w. bvroycondary 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 24ne3ysuso4nb;0ezr n9fc+nl; /yj)r00 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secfrnceo bs ; n4zly4n 3 j/;ru+n)esy09ondary 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 transfo5w n:)kdz u/ogha g,+mrmer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglekm+u, h5n dg)wz:og /acting 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. Tq ud5rmbc 5c:9he 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 numb95qmcu rdb c:5er 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 cuqnu :e+r.l-psrrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmqnle-+sp r u:.itted through a power line of 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 A of current at 120 V. The voltage is usually s48x6m8f qkg ljtepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage pjx 6gmkfl 4q88ower 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 ri6 1lci-qt kkhz9s v0 g9fg i)xsf0.4line 50 km long has a total resistance of 0.60 W. A generator produces 9s6sl10kgr0zic g hxi -9q vff4.)itk100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total re( 6.sz p0ongzwcoapcs60x 0z3sistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transfo6n 0o(os6s 3xwzaczp g 0c0p.zrmer 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 lf0u bij1ebl+wt*- m3ns5j9d ress power would be lost if the power were transmitted at 33 s+d195j-uwbrn ei bfjm0l*t 000 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 genera mki d.jo9hw.9btno+7tor is 440 V at 20 A. It is to be transmitted on a line with resish+ojd k 99..obmitw7 ntance 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 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 curwxwg qxtf.d(k4xe dr5+dx2(n ,j c,l.rent of 5.0 A. How much energy is stored in the coil's magnetic dxgw kdx.dt 2x e(xr.n,( ,f5j4qcwl +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-)x s5 c 9,b9drbkoey0aW resistor and an 18-H inductor. What is this circuit's time constan5ra c k9,yo0d9b )xsbet?

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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 is 120ze 9vr -tm2.lun6o2xy e7o)ff 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 ahq;lxlscpjmd2o3,8sj eb(69 120-V AC outlet. What is the 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 120-Vdpxzrzzv3fi; ;;q,d/ AC outlet. What is the resistance of the lamp? rzf;,iz ;;xd/vpz3 dq

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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 jfio h.j f) lhl,j:+c2to a 120-V ac power supply. What is the peak current +l. 2: fcojjl,fih)h jthrough 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 supply. Whwy1 h.m6k odnr k oj4 u*svq8 uqh4:59xdgc7t)at is the power dissi wghds4oyo j:xu k v 817dmqt65unhr9q.)kc*4pated in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-Wrzozzt +w+z: ( resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resi8p4ifbug+z wr 7s 4rue u;hwk7-vg/s 6stor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is 5y nvoy)zv/l4 z y1hrry w.ky(,0 m)w1rdj8 od$I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 60 -0 bhb wkas blciy(06: x1xp8zHz?

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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 reacux8a3 pmzbz6vr)86pp tance 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 have329+ aqywxlh hengx w(r69)d e 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 1 ,hi(( eqzkj1q57 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 vs)/cj a:(bdd of 20 kHz is appliedjadvsb/ dc ):( 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 110-V, 60.0 Hz sou3*f e/uds3gdj+cq 9rn rce?

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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 renq ;ns7bry*q btcj3*nfq85 f+ actance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance 217psvpe yk2xhtq*by 3qg b80at 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 capacnb1dhm *tb1g ouxa493 itor 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 capacitiu gea6jn s0854ca3 wstve reactance of a 0.010-mF capacitor be 100 W?8wueags tsjcan5640 3

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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 -om/k nvv wip47-r)se5.0 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 circu6iv2s l:tk,ntcr bp uxs0v9:( it with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capaci0krv xi,lu:c9v(tptss 2 b n6:tive 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 coil7mw(lycq.me+yqznp d syqodm* 38( s26r 8 io;, and 1.0-mF capacito dl7eq3+ 6; ncmwqospi2 (.8r8o*qy(myydzms r are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and ,mgw ;nbz5: )cf1bo kx1.0-mF capacitor are connectedx bm):w,1b5 f;cn ozgk 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 connectu3pybej jq9py6x ,e(1ed in series with a 20-mH inductor, what is the impedance at p j eyq,jpxueb 3y(9611000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series withi7bg-b ;ok(7vmqo6xfjc (tp * a 20-mH inductor, what is the phase anglei;6 ((qx ovf kc*j7-gbmto b7p at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0km vsr 61 gt v-gizsdbl2u1;ln:z;5a *-mF capacitor for a total impedance 5b2 k ld;6u gm-:g z;vvtsirl1*zns1aof 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 -ilgh *jpa)/sis needed in series with a 100-W resistor and 15-mH coil thp*gsj)-l a i/o get 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 putzw1 )6 n4gqoz 6/l*cmalz +-bn4hyfbu/8 uu hn in series with a 450-mH inductor at 5000 Hz for a total impedance of 400ngb)c l/zzymuo-8 l w6 *h zuf44hu6+/baqn1n00 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 resistor at 1.olse ;/al :6x u+ l rgsg och8:3g+s.uxvi7vr+0-MHz for a totg7/ocr s .:rhlvg: ug xl;ei+v6 3alus+os8+xal impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is conn9jucja b 4tt1;ected in series with a 20-mF capacitor. What is the impedancecu a 4j;91jttb 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 capacitor at 1.0 kHz fo4kr 9oe))tkykka0 y)8b h) nrvr a total impedan tk k )hk)9 y4)eoy8abrn0rvk)ce of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1lyc /z2n r2dw+.0 kHz for a phase ang+ wdz2nrl y2c/le 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 w9.)i ofpmoe3go 22 zmjith a 30-W resistor at 1.0 kHz for a total impedance )om3e pog9 foi.mjz 22of 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 iwyv*g23 ryvo )n series with a 100-mF capacitor at 120 Hz. What is the phase ang *3y vwo)rv2ygle?

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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 5.0idh w03lp e 7d0ta:xhti 0s;jd0l9fd. V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connect ph :.e;h 7x ai0l9t0sdfd30wit l0jdded 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 capacitor, and mzp5kr/aium ptn) c8,4 t31ob a 0.350-H inductor. The circuit is connected rk4,n8)1 t ubt/c m5apzp3io mto a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive r3v8t9*mhnyvk eactance 30 W, and an inductor of inductive reactance 30 W are connectevyh*tk 9vm 3n8d 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 circuit contnp w9r)l+g6,ib4d;2gy1kbzy doz , rv aining a 50-W resistor, a 10-mF capacitor, and a 0.z,9 pv14ygobkg2,nyzd6rwrd;)i +lb 45-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 in series with a 500-W resistor for a phase angld0iz1wk z0 *l2i5cvd ue ofk5u i 1i0v2z ddc0zw*l $40^{\circ}$ 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 f /kz:pp)hkrqz6ee;7 . At what frequency should the circuit be driven in order to h f6rp;: ) /zpkezkeh7qave 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 7bg)rwia69y(ty 2 qnfresistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V fnq2i69(w) abrtg y7ypower 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 circuhqv+c (esl: ax .7lad*i+stnt m *be)+it is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W.dfp5.c(sf(gpvnb+j* n a71 xb What is the power faj(nf p nfg.b7 v*absd+p(5x1 cctor?

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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 cyos7 - xuoj4k q(al01bircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-Hqjk a (l1sy-b7xu4 oo0 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-mHuj4 y6ycisou6m/is* c y0-s a; coil in series?;0 o*yiyayscucs6js-6 im/ u 4

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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 p*8.*i;d(gscs ;cc zes3tdo y in series with a 4.7-mF capacitor for a resonant frequency of 10 kH;zc s*8di*3se ( ;pctocs.gd yz?

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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 inducto ; +ggy)4j zgt rwcfob*v8yyw5x2 o9:jr for a resonant frequency of 1000y+*ytc5g2;z xf8:bryog)wov w4 gj9j Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor n.w-.66 2a s.7ar (wxg m -reduveixhzand a 40-mH coil if the resonant frequency of the cir.7d.-2xazaxrs(newvh wr 6 euig6m-. cuit is to be 1000 Hz?

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