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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 units of magnetic xdvde am.+ 9ipp/sb(8+n uly .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 stj xb56n2fimnp2+3: xl a ;vt/ie8febeates 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 of chang z ulpl/3r4px-e on the inppx4ul/rl3-z duced $emf$, 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 loo)y n)xp zy+f+dp of wire produces what kind of chan+n pz)y)fy+xd ge on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind)kug m:a q8lc- of change on the induced 8:l )qg-a uckm$emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnmq/1 q/cm8xmw etic 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 directiojcxl fu ;-,p9vn of an induced current in a conductor will be that which ; cvf-,9pxujltends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magy v)hdsjm(hj8x+)d w )net is held above its center with its north pole poin 8sd)djv( ) +hmw)yxhjting 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 horizontalsm y6w 9qh7;jx table. A bar magnet is held above its center with its north pole poinhqsx w97y6 ;jmting down, and 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 y6:.a+suk(a 7b aylxh table top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what lby aka.6( u xs:y+h7ais 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 magnetic field vexe:+av-fe yu 8ctor points straight up. The magnetic field suddenly grows stronger. When 8yxa -ef:vu e+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 th8+of lz v ao 4sp(0.8wnqjkeee kg-41he magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, wha l vkf(e -hgoj+oa814q04n zswkp.ee8t is the direction 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 ajgwi ec62*bk4 horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the 6jk 2b4g*i cwetable, 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 no-,ylzk,o e)0 kcu2ep orth pole entering first. As the north pole entz,ely0c- oko ,) e2upkers the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant a8xkxf-npe f. .b( g:*jgij) aungular speed about an axis whose direction . k :n8x-fgijef)pg.j*(ubxa can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be 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 an axis cqj 1fkxl;u*; p2aox) 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 rot1*o2k ) ufcxl;;japqxation 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.pyw*y. 5mfdl1
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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 thatezc-g.x3p. a,px n9p o 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 fielwgv z75vrm-1z*gfcg 9 d. 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 (oriea1; bcm3k6hfy m6jnk18,s n: tuyg:osnted in the east-west direction) is moved northward at constant velocity th,68 fgy;:c :jh 11sokyb 6mnmktuns3arough 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 veg mbhkjxh)hr + au// 1w;v:-hulocity $\omega$ 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 transfm h7,. rbymxq5tet)t2orms

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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 frequencylwbyoh*m h uvqxnl/: q/1+*) 6g zym;h of the lhhqg *: y/ oxm1bqzl u)*y+h6w m/;vn$emf$ 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 wh4i32 il (8u6rqgcik8 ylwzx0zi8:g 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 thapmjegl r;nrp5*b+ q 2:t

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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 :lk as1pr0im. secondary coil contains more loops than the primary coil then it is a0psmilk . r1: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 teqxcj scdyr,a*-*7)r he primary coil contains more loops than the secondary coil thenr,c*ys r-) q7*xd jeca 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 inpb3u,.d n i1mybut

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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 circuit,. r4yzu bm/-0nkebxn3

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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 connect2x ewf8gw c-.ued in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, thexce. 8uwg2w f- 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 b b yp 7hyym-/.c0xk/eseries to an ideal battery of constant terminal voltage. At the moment contacpyb /ycyb.kh-/e07 x mt 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 indz:s4iziu wsls9b :5/ huctance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inducta*s43 xa0 alc a9dfag nrzx(k7)nce L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in seriesc76exnl l(aq . :tfdf*yiap (9 to a battery. The time const7i pda(q96l (*fxa cftyne. :lant for the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series) nvi ozso04,v to a battery. The battery is suddenly removed from the circuit. The time constans0o zv4v)ion, t for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units :l tmo 4 tld;rvysly8/;7l (bjexcept:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connecte q (c(+9hq -rv+25n lpfhdcwpdt-5 dxsd to an 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 connected ft/8l,wf ,sc3v3qyr h5pj 6ap to an AC power supply. In this circuit, the curren8j36p 3cw hf5,,a tfsrvqp l/yt

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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 azu h;-oubaky+qiu87 + ytse.7n ac circuit changes by what factor when the frequency ieh; b+ut-q uu8z yoik.sy+7a7s 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 an inductor is doubled, the in)w5::-a uzfbsz)ep + rt 7trihductive r7rz))i-5 uh:at f:ebr wtpzs+eactance 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 inductor akz kks);l4v( mpproaches zero, the inductive reactan;vz k4)skk(lm ce 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 connect(2s n 9jmnb4heed to an AC power supply. In this circuit, the curremjn4n9 he(2sbnt

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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 wto0zx0x6- ncxauwp f8oj:b+ . hen the frequen oax+0bf o:8xnzt x6.wc0jp-u cy 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 AC voltage across a capacitor approaches zero, uio l/, 3zjuk,the capacitive reactance / i,,o3zjuklu 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 betw0 e7 uv7:jhd5 zs6xltt(hqps5 ks6w1geen the voltages of the inductor and capacitor in a RLC series circuit?zhs1s7 vxud5e:t(65kh tpg j 06sq 7lw

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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 akrdr:( a :k (5vvml/8dmbp0dq,3sxxan 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 ry sn+:tn ly77increases. Whenn:n y7rl 7yts+ is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increag+j +ii.d9 mfgses 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 in 9wb ji/4wrbjuph0 l;7creases 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 do2o tzec vn4n6*y/ut ,d.vdzy+uble in an LRC series circuit, the resonant frequetz2 ,* yvo4ndeyndc.z+t/6uv ncy 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 vd m)7oaol:v +xoltage. 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 circuit occjim e+sk,xq9wz0mi2zrd : (1 iurs 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 rolk m9u3vx6 0-2qfq lxetating in a uniform magnetic field of 0.20 T. Find the magnetic flux tl 2 klx6mfu3x9qv-0eq hrough 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 rotating21crfu(v v2m v)mr7+d cvujc9 in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and thj 7rmcr+c )fv1d vu2mu2( c9vve 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 f0 4:rq)-cs 4)jdsy 0s (leoc wo4ogbx+wyl4u a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the p)s )4rel:(s0 cqo0xydof4 w suj-yb4+4gcowllane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of hter f70kv+otel:muf*e -73 dan adjustable 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 chq5vjx k(fn0k6g,v-ae ca9 lr8anges 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 of7+1qiqhd + nyn 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 uniformln+ 7n hq+ydiq1y from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and hi.q+g,h dh81; yxf tlan 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 anrlbz 1n*1:6mi chk(l cd 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 span of 60 m flies horizontally at a location wh4-2 iark 1p7 fb wb*j9(mlhurgere the downward component of the Ear(h r 4lwj-fbup 19 b*gk27miarth'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 angular velocit,ye8elr hglkr69zt(i aoz8 66y of 2.0 rad/s about a vertical axis through one of its ends while 96hygz l6zrr( oelkte8a68i, 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-sectional ab2)/df ;w 8af3 dzduzenfi( 0srea 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 wio rvpur. fp kmzwh,*i3xc/ecv.j7 36 (re 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 l i a*eyph(7(vloops on its armature. Each loop is 12 cm long and 8 cm wide. The armature ra( l(hv7eyp* iotates 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 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 1mymd80 0b4 xxn00 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 outpu1z 0lg9d 2jad3gz +dea-t 4muxt of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is zgtd +almduaj4x 1-3ge2d09zavailable. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator we,f7 anv4(my3cka:kkg+ ec 2h ith 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 operates on - p3nkccq171dy yr2rh$120 \; V$ 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. The 2msa6/b cpae1t-3w prb*fid 0motor operates on 120 V AC, and whbep2/i*wpm f0ds c3-tr aba 61en 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 resi+idq6++bd) 4 z rsydiystance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is t 6qyi4z)b+r+sd y+iddhe 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 24h5 nd;*9egewj-V power supply. The operating current is 1.0 A at full sp*wd9j;e hgn e5eed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supwgj nt m5-ot/5ply. The operating current ig-nj/5wtotm5 s 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 i, okkp6ee ws 132q0f7ciesv*b 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 causes 14 A to flow in thk pl c.;cdky. .-wv+wje secondary. .-ckp.;dvjk cl +y. wwHow many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if tkryiqg.nh)- e bj *g.h:5t ic:he 24-V secondary has 100 tug .i.:k :ghterhjq- bcn*y5i)rns?

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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 ayrs**25 r4 e 66s mrj+5slv i-wwwlktmnd a 2000-turn secondary coil. If the current in the secondary is 3.0rw4 6w- 52rilsl** tr smvy6ws5em+jk A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the p4qk/v2w9 w.tib:t kv: rij0 rqrimary of a transformer. Assuming 100% efficiency, ho9tj r/2k w r0.vqwkq i:4tvbi:w 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 a neon sign transformer provides 7500 V at n2p.w:3 jcsbno d7sg,10.0 mA. The primary coil operates on 120 V. What d.oc3j s ns2d:wb,pn7g oes 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 and 300 turnrb2*g8 sgep/x s on its secondary coil. If 120 V at 2.0 A is 2srep8 xg/ *bgapplied 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 onnbw(3hx2 m0qo its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in thqb0o3mwn2 x(h e 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* 8sf1swwls*mr.hk 9 z and its secondary has 200 turns. If the input current at the primary is 10zmwr s.1w8*khf*l 9ss0 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 200 turns. If/ik0 yc1kw4 an66ynnf the input voltage to the primary is 100 V, we can expeck cwfny0 i46a n16kyn/t 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 anx5pqqfbig.4*k( x oc) b(vvv5d its secondary has 200 turns. If v*ixkvbo 55p (vqg q).b(fcx4the power 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 oxozog5z9v/j gd3k il78/ mm8current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of tzl5i k798z8mxjo/ gogm/v 3 dootal resistance 1.0 W. Find the number 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 q * n4vr zp63gbdjwy(9120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in w j9q6bz(4grdy3p*v nthe 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. k c.ij2xt2t).1 yhyyv/e ep6vymp8+r The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not step)tv e2kej6p pcy 8it.1yr+2/xv .yhm yped 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 lo p*f dkb rhq*,;i+wt:ong has a total resistance 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, th*t kqd ;bpr+o*w i,f:he 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 genera1 nc w t,3r*fqw t4q2k.w;rvxptor produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, tr3 rqww 2q.ctntk ,xf v4wp*1;he 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 .3csm:azy x sk 2qdq.;n8 67nl uk6lvqat 1000 V. How much less power would be lost if tmsu. l8 6 qy;vqdnkq6z27:ac3 .slkn xhe power 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 transmittettksy1aed2u7u9q -nxg-wt 91d on a line with resistance of 0.60 W. To what voltage - tq 7xnysk2uau9-wte9 dt11g 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 current of 5.0 A. How much energy is ka+teogf.eg :9. z 0f:fftq9w stored in the coil's magnetit g+.::wqzfogkt9e a.ff0ef9c 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.dv 46u d2kjn2yrg,ka( 0-W resistor and an 18-H inductor. What is this circuitv2 d4( ru2nkkj6,yd ga'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 is 12 g8* kkjdh0/csoa*x6 ionh4;v0 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 tizs5z/6t nn( 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-V AC outlet. Whatw gy9fa 4h-:l mc 3d lhk*)me;xcb.zy6rn)xw 1 is the resistance of the lamf:nlc-). wh19mcx yerh36a xlzmb4;*ygk ) dwp?

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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 connect(m2 my- sewik69z5eeled to a 120-V ac power supply. What is the peak current through the resistor?26 59m skl(we ymez-ie

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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 connecte3bcn5.s(cz.kz :air/e,s okw+q 7me md to a 120-V ac power supply. What is the power dissipatsno .z(ame:7r+ck,3 b 5mqki c ze/s.wed 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-W resistojh d,c0ut..h5.b k:bh yovst/r is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-.5ji nqmxim2 8W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor 8,clp3l;f ejo is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH ind -on; h4obnnjk0d4 5yfuctor 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 reactancv t 1n;(xj wd7xe,v5q:3 aqlcze 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 i6j5 ry./gq6xj- p4xknm y2pzs nductive 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 forh wubud s ler.:8vqb;,becz6xbyt 29cw; ; n56 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at q23q z3mdlnf 4a frequency of 20 kHz is applied to it?qnl 343m fqz2d

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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 x-k0o. p ixu oqxa+.o.t)y b7ga 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reacyzwaf rsa;8ve )8p pz8wy2y1.um: y h*tance 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 neede u*h d(qs1x+mwd to have 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 a 10-mF capacitor have a reaj(yg 7bzo4qkp- sb)u*gj53 ljctance 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 capacitoo3 n il0tn riw)a( + 1hcrc;yjw7xno0:r be 100 W0 o init;:lhnnw1 wx +r3acr7)ocj0y(?

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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 a w 3tjxnuys2mm 50g6z8t 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.ua+xysh q,mi,7 h3+6 6znvez rd*x-g q0 W inductive reactance, and 10.0i havhq6*+3z ,szgdrmu 6 nqxx+-,7ye 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-*ao /34zfrcvsW resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?rc*zv3 4osf a/

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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 i4ts2yz )h p,:pputs( gf a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are pss,zp t yh 2)ugp:(4tconnected 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 wi4y),,m kue rkqpk+e/v th a 20-mH inductor, what is the impedanc /ekyvm 4+k)u,pqe,rk e at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH indx9(x 2db5nahj uctor, what is the phase ab9ahx5jd 2n x(ngle 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 circu0*zoypwny 5 xi *d5i8mit with a 20-mH coil and 1.0-mF capacitor for a total impedancy8 i5owp xymi0n**zd5 e of 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 .y rp9vk*wp /e31bsz z nj7o)j,f2llwis needed in series with a 100-W resistor and 15-mH coil to get a 3fb1leo/zpjl* p)j2zswk9yn,7 .v wr total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in al-ir fin.+t.105sx : loeeshseries with a 450-mH inductor at 5000 Hz for a total impedance.ha xtsoer 5-+0flln ei.s :1i of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistormyo5.rv/ jt9jt ci 6 ;jy8svu0 at 1.0-MHz for a total impedvt.9vi 65ym y urj0 8jtcsoj;/ance 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 c7o/hs nmnma4ojg6h -)onnected in series with a 20-mF capacitor. What is the impeda46hgon a j/7ms)mh-o nnce 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 withwvepd(h kekse)h mwtwo2a0 .;u( /2z/ a 10-mF capacitor at 1.0 kHz for a total imped(ezau k2tkmh/20v;s wdpwe( ho).ew/ ance 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 zgd348a w e/s s szfj6ijf3+2fa 10-mF capacitor at 1.0 kHz for a phase anf +s jazd62 83fsi3sj gewz/4fgle 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 q70 c j/njizg0 kw8)zja 30-W resistor at 1.0 kHz for a total impedance of 48wjg 0n j)kz0c7iq/z j5 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 capacitor at 120 Hz. What is (hijlfu1 pxs 6v uf91- i0*wokthe phasek1j*xifoh- 09 (vpifu1 l6wus angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-Wsm( ohk,r,f)v. ni j,t resistor, 20-mH coil, and 1.0-m)j,t.h ,,skv r(imfonF capacitor 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- 2/-o 28v5kmo e9ffmghtpiqfef o 6 54)g)pwwiW resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuiw) e e-k2ft6w4hq8mgfi)v5i/pmg 2f5 poofo9t is 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 capac ee,5-km+it8an8 wk+f6sx hpyitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected 6 tmy+s,e+inxkk8 8p af- 5hewin 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 circui 9i8tqi+ 2sg4z ehr4mtt containing a 50-W resistor, a 10-mF capacitor, and a mr qit egz4sith+8249 0.45-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 sb4z;px j) fa7i:0i fkleries with a 500-W resistor for a phase angle of if) i4zblxka0 p: 7jf;$40^{\circ}$ 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 v w 7+bbx25lqawhat frequency should the circuit be driven in order to have maximum power transferred from the drivin2bb5axlvw7q +g 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 resisth6;bom u+fd b2ance, 15.0 W +ubdhf m2 6b;oinductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit g,h ) +mt4vg9wrsn.o) xtxc 2ais $63^{\circ}$. 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. Whatsi dyb0ec-li ,2/c-x,/ egar f is the 2rge ,ai/fb d-ey0,si/l-c x cpower 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 R4sc -e1tv c3t 3uy9qcrLC circuit containing a 50-W resistor, a 10-mF capc3yqc-9u t3 cvs41ertacitor, 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 ck;9 5g8qc j yk5jah.zaapacitor and a 15-mH coil in series?;z8.9hj g5a5a k kcqjy

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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 fr9if nc,opj(1)uek1 h ama- 0qoequency of 10 kn-q1pjfi (o, uc a9)1m0o ahekHz?

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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 ov9vv: *vcdo*itt-4qaw2 n+ia 3.7-mH inductor for a resonant frequency of 1000n9 oaqt i*w:vvi2+c- tvvo*4d 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 r c7 +8k f3sanpeb,ntv5esistor and a 40-mH coil if the resonant frequency of the circcf3+5t7p s, abenn vk8uit is to be 1000 Hz?

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