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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 unitevg8zu4jq+s.dgc( x/s(dh +u/ mjh8tp f)b y4s 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 statesb jrd590e 3mb;gk:,evpg. zs.oki iq1 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 op4(hk5xwk -f)bo b jlx;e9nd: f wire in a coil produces what kind of change on the induceko;b4hej)-np5dl :f(x9 bwkxd $emf$, 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 m/zjkof9w-bj+-yua 1hs+y /h4 ph mc;the magnetic field through a loop of wire produces what kind of change on the indum4s/hbwk/ yzp jhmy; a--juohf+9 c1+ced $emf$, 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 l75i e5sgho7 ) zgcy(mfoop of wire produces what kind of change on the inducemzs5h)cf gi(g5y o77 ed $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic fiepof2.k7vzs s)+ ztg9 jld 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 a conductor wu.vpmjzw./th4ad,i geo29 0 will be that which tends to produce which of t0p i.o2.eu dj,tavw h9 mz4g/whe 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 t1ongw:j ydqky z)(- m:able. A bar magnet is held above its center with its northy:ogw:n1mq-)(zd jy k pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magne - 7t9 kwgq,upkjzjnd1g*( m7av6 -unst is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling maw*u1j-jktd,u677m-qn a ks (g9gz n pvgnet 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 s,mic w cg9wu9a i4x*7top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this i*wwc g, sm c7994xiuacoil 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 acbaqct.82 5cyta26 cb region where the magnetic field vector points straight up. The magnetic field suddenly g.aacc 6c2 q5ctbtyb82rows 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 hu ohi 1ds6/3x/ qk,qbin 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 in3h d1bih/koq q,6usx / 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 liqoku 6a)k5e g(es on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of t ku56oq ag()kehe 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 tc-esjakl/-6lc v rf0 5hrough a loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as view-le alvjf0c / kc-6s5red 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 kxx;p68.1 l; rrti rfyis rotated at constant angular speed about an axis whose direction can be varied. In a ;rrx8tp ; xryl1kf6i. 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 s*1l p:xjcz h2e cmip8f(a(+ hkpeed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of cjp:axhz*2p+he1c8f (k ml(i 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.7tj *zzm;d4noz7e 4tm
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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 thatf yfkn+uj 1*/e 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. The.c/7ios, q+ fzaoxe3 e $emf$ 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 northward a5hkzs4l :b;t6d1h uhmt constant velocity through a magnehd tusm6h1klh4b5: ;ztic 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 vel/ vtxxw,yw u2,ocity $\omega$ 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 transform 9ndrxd7o1+ogs

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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. Th9 +is3sfzp. qde frequency of thef szds93pq.+ i $emf$ 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 used57og i kn9rc p-7mle/f 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 devicna 6x3 ;qg8mho euk 1mq+u/(gfe 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 oq xh v//bm+5ksecondary coil contains more loops than the primary coil then it is /h/ +ombkxv5qa

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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 lgl/ ( kjd7pi5 fq:)zkooops than the secondary coil then j:f pio/ k(5) k7qdgzlit 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 pej:6 * uiusz1uower input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant cij5bqz6c4ntiqh/;r7f rcuit,

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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 inductorp1h1ms9j mh7u;1v2m whjar d) are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with thpjad1 7m291s); jhhm 1rmh wvue battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an id;yu7a1/or2 8: mgy 80gvxdut)atw h mleal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the induc8 u;lg y1vo7gdar/:ym0tt8 xu h2m w)ator 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 R is connected t53f*er o jh *9+6jczdz5 tlcwso 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 res5,pa2fd fn*(5srd rxiistance 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. nqmz,/,y*ttbcy0 ft+v:1 l iq The time constant for the circuit reprcq1z / ,l*fmvq+b, n0:tyi tytesents 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 to a battery. The baq j6/yt crt3e. v(vf)yu5xh3 ittery is suddenly removed from the circuit. The time consta )jti63fxu35y( h y.vtqvc/ernt 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 unitefw2,gc:djrxw4. 4z)6 tu t ucs except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the currd2ld;fnd/cb/r9 i wt3db7aq51 bd8-g6wv jfvent

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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 4-brxmb2hs v5e* r g5zan AC power supply. In this circuit, the curren *vs-5 bmxbz2 r45reght

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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 change:x-k6 dl 0 zgui,gx(aos by what factor when the frequencxgg,( k6ix- l doa0u:zy 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 volw jhtc;. /h75 snwis-etage across an inductor is doubled, the inductive reactanctc/jshi7 sn; .-we5w he 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 ind6cwjfofh 8ol n 3;;n2iuctor approaches zero, the inductive reactance ofnc8 foln3 62;hofj;iw 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 az tmp v/9o)w3ktxxw(4uxp kn31qj9, gn AC power supply. In this circuit, the currentkt mxx(3x91,wv p/9t)z 3jo4uqnpk gw

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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 j h d(tg6ai8d1)d dwd;circuit changes by what factor when the frequency iswgj; dh 8adtd1 d)(id6 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, theyi)hx :l b/d2h capacitive reach) /2h:xbi lydtance 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 ofc;,b cgi,km9 g the inductor and capacitor in a RLC ;9mcgicgb ,k,series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of riclmzc+/i/ l )f)d/;/c :ogg;vrmdman 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 increas66kutxq3(plc p0z n0ses if R increases. When is this st0(6 ptc6npsz quxlk 03atement 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 impesgf;ct0o -5x3 g)qe egoi j,1hdance 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 c2w5+o9lpolm)lg - 6it7 ktfd hircuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series -iu vrx ub.+7)-mzu0k2 vutg zcircuit, the resonant frequency of tv ubtk+ m2 r7uz0.-uuv igz)x-hat 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 drive6 ek ca(9hvy8un 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 circuq89 jccf+f4wait 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 radiusfm.irf n2oqzm4-k((0o g b-l8n)gug f 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the-f)fm g ng glqo(8(.04r bn-mof2uzik 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 inzt,ev bldec/14oak4ukx4: ,p a uniform magnetic field of 0.20 T. ed o 4zx/4peu1,bkl ,aktcv:4 Find the magnetic flux through the loop 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 i4/ kwkcpit9:s n a uniform magnetic field of 0.20 T. Find the magnetic flux t9k c:k4pist /whrough the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is rekrryqm lb l ef86s3)+c+4v.yfduced 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 cha: qz/xod sio+4nges 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 square p9 3 kt4t- picvc glakoet-ahr, .5:b rm,c+w/frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field chang/wa5piah9+olt ,c. v4t3g ,ckp -rm-erb:k c tes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an lx n-a29;-r*zabyug jarea 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 an+oi( z vz (bf;dhhr(ff4 (0qumd 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 h+jr. pdkdxez8 ,g.63oi m fji*orizontally at a location where the downward component of the Earth's magnetic field is zf3jom .*6 d.+8pd gi,jxirke$6.0 \times 10^{-5} \; T$. 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. q8014;h1t brmhhz5s ov4wctgfxc.+ dto q4 (i0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant mag oci wmq4qt(sordzbc4h58g 10 1htf;+h.4xvt netic 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 *ma ;1 tmidz 8wzqtonl+ s+8*nloops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of fas( msaix2+ xxd-14s 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 its armature. Each loopvx5z)od k1 4f,k vhlek+5gwp8mvc oz 13g5u/t is 12 cm long and 8 cm ukgg3c5k85deh)f t ,x/ 4vm5 lz1kovp zow1+v 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 of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of area e)5ispp7 hmx9 s0ne+r$0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output oq3cr oj u rg;3w-vxla**:u:r6 dexs/uf 12 V maximum when vlea*ru6c- q:or/x;3s uw: ugd *jrx 3rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a mah7. rapvatm1t tu 7-: ocw-pq.ximum $emf$ 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 qk d:bmw6,cx)/oj d(cresistance 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 resistance of 6.00 W. The motor oper:r/ sx(olm) iaates on 120 V AC, and when running at full speed it generates a: omxl(s/ar i) 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 connectedf sp9dud;y:;d to a 24-V power supply. The operating cu9s fdp;ydd ;:urrent is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal nn6mc7; .o;p*as(yfuu up d68 +ty4)xixya h uresistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A x * 6d h784utipx; )6yp(ac;m.+synnyuau fouat 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 resdo wuh7) j2tq: rfv(f3istance 6.0 W is connected to a 24-V power supply. The 3v7d ho)t2fu qrf:jw( operating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary volt rm43oovc34lmn-b /t2o ;db+2m egoylage 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 trans( yadwtid176 mformer causes 14 A to flow in the secondary. How many tur7dwym1( id 6tans 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 manye e5qrq 9q4fz8 turns are necessary in a 110-V primary if the 24-V secondary has 100 t5fqe8qr4z q e9urns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consiz mke+2wd3nwhz 3* jouuaw ky.wf0:24sts of a 500-turn primary coil and a 2000-turn secondary coil. w d z 4ak232+*o.uu0m wzw:w3yjknfeh If the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the priv1xhs(p*:9 na tqju(ymary of a transformer. Assuming 100% efficiency, how n9uqt(: aps1xyv(j h* 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 y fx9+vml;jfo mri8;6transformer provides 7500 V at 10.0 mA. The primary coil oper+ j;;8v6ym9 formxlfiates 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 a y*z 6ay1sn0nze(e yl7nd 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the prez 6s e*1nz 7ylay(0nyimary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil x2: ivv.j/kjy and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the p2/jky jvi.: vxrimary, 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 tran/dk ,z5xb sx5rsformer has 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 secondary to b5 5r/sxd,kzxbe

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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;z i:+olgzyy o4o2o8v the input voltage to the primary i8ylo+gz v 4o; zo:i2yos 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 tran :7; m6pg:xyffe5*mkkz xc6vh sformer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can6g k e chfxy;pmz76:x :vk5mf* 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 voltx3/nz ck/ksf u)gez2g x;) l qok.6ud7age is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the su/n6zxol k)dk.gg; 2 sqc uek)3x7fz/ econdary 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 voltaf(xol(6wgu do t,-6 sha2c5qnge 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 transms2d(nh gl6(t6u -wxocf5 a oq,ission 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 64 oe,9 2j laqhfdkui5at 120 V. The voltage is usually stepped up to 450i25e46,k j9dfu l ohqa0 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 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 760z ibztfx l s/iph1;generator produces 100 V at 70 A. In order tol z0 p;zht61ibs7/ xfi 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 longaih1z- +1ivi,bwwdx+ ,6smo2lw +o oc has a total resistance of 0.60 W. A generator produces 100 V at 70 Aibowoo-+1,2+,+za ihmds 6x 1wwvi cl. 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 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(mg iepdc4*hj)e/i(c:ttt9 hi6 w-og 1000 V. How much less power would be lost if tg*h:t4ihji /( ei(pm 9doe t)w-cg6c the 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 generat2 ). c-bd w*c:unkrteqor is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission ik*r2 )tbe u-cdwq: nc.s 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 energg7h;z4sua ijacmv( : 9y is stored in the coil's magn z(a4jiucv:9a gh;7 smetic 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 cobgqxok7v60g. b/x abt2jkt6)a vy/4u ntains a 6.0-W resistor and an 18-H inductor. What is this circuit /gkt.4 ov/xj27y b aqu6vxbb60kt)a g'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 t6ynu(5q f6e1 miou-ol he rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V Az:ttzc3nuo 8 r- jx7s4oiq8-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 idrp: 0pd1+ll hnto a 120-V AC outlet. What is the resistance of the lamp:+pr d pll0h1d?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac powe5m 1z3hzug 7ier supply. What is the peak current throi5egzum 731h zugh 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. Whatka7-ii2it ha6 is the power dissipated in the re 6itiaki 7a2-hsistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through xsyz)j(lm7+zvzu +b 5 a 50-W 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 a1(nf kbwks 35+6ufg(+f 9(mcbiamvhz 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistfp:pnun5t 1qb d5ma**: +jmqpor 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 reactanct0) :paap0 3txbdq45mww4umg e of a 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 ofq: vvmt1*ero o p+)tx u))d:zp 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*l/p uglia+-0oa.cfd 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 necessk:rt7mj0e x1nj;j3hgary for 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 a+8w,geofv vn)2p4o ox+ta j: zt a frequency of 20 kHz is applie wv eozg+2fn+4)op8xjt v:a, od 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 du8yqo iktu.)bk 4,vs +fe to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 vm5c6e(yzgbo-4gsa0 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 1h+ zv:zo8dcu 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 reactance ovafz + 7nutl()f 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 0.045*of1 fi)h9tkcf mn y3u0t* wja8hmn 10-mF capacitor be 100 Wumj3an5f9mhw 4fk 8f1* 0y t)h*tionc?

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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 5.0k;qgfp, 9votc1b 7a/m 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(yy,fk8q ) opx)(fw bx8r)dgy series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reacdg()qy) f (yrxyof ,8xb)k8 pwtance?

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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 *z7,zfj1x(6v oksj o tjy19f u1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor arez1sjoj v1,xo9z f(k6utyj *f7 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 1.0-mF f2win;jfd xst.)x/h5capacitowdh 2n5i / ;.xx)ffjstr are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is the uyp ih6lij 1aab,9w1 h+j.*jq impedance at 1000 Hz?b,h1jpqw9+j ja h6 ya1.ilui*

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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 sbtny5 axvdn6+;p rh16 +fvov;eries with a 20-mH inductor, what is the phase angle at b+dovnnf;5h xva; v1p y66+rt1000 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 wj k amlq3-l2r3zos-wf+ g-jy (ith a 20-mH coil and 1.0-mF capacitork-l+lo(mzj2-3qwa3 y fg-srj for a total impedance 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 0)c,hmo dvrf hbm3qlx o)l076is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 1holhqfcm 6lx 0dobvm7, )03) r10 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 45-j+pu qtcf1 bas8k(:dmx/3uh0-mH inductor at 5000 Hz for a total ix(a:b+u8-s1pmd3 tquj h cfk/mpedance 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 resistor at 1.0-MHz arn wc6 r-6l8bfor a total impedb66 crrl-anw8ance 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-kc,(m+llhj /:wl( k s xxd*)jfmF capacitor. What is the impedanch (dcxl kl( f+mkljwx/:,s*j) e 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 kHzxw 8e4ceq6l.g for a total impedance of 45 Wle wq x6.8eg4c?

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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 1.0 kHz for a pqlr y.;3(npjtt5sc,f hase angle of trf c(l3 qyp;j5t,.sn $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at vpohc906 y58uftw,+cea :z dg 7i4slki3q e1g 1.0 kHz for a total impedance of 45ach ee6c8kd7w4gp f30q sot+91vziu , :liyg 5 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 seri266x1;nod krw:me jpt5g1zoa es with a 100-mF capacitor at 120 Hz. What is the phase ang :zg 15ane 1pk6dt6ojx2rw m;ole?

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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 5.0t 0bs((gal6u+xkn -cn V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in sctlks(gn + u(n-6x0aberies?

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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 a 0c5rgh)u6p ppv :07ajow5p*b n .350-H inductor. The circuit is con*65 vpup 5hb0r aw)o7jgc:ppn nected 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 capacitor of capacitive reacta3riy 0kdj5n 7ro,ai*iiqscdt0 9 :0cgnce 30 W, and an inductor of inductive reactance 30 W are connected in seiy 0 d0 k9o:d3si c,0q*an7irgrj i5ctries 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 /mz/s guj7l1nf62+ialfs 1lj for a series RLC circuit containing a 50-W resistor, a 10 lj u1i6/f72fz lm+ nls/ajsg1-mF capacitor, and a 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 series with a 500-W resistor for a phase ang+s.ldkd.bcri(4 du5t le ofts4+k.b5 .dr( l idcdu $40^{\circ}$ 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 frequ1hc gpiks qqt-;)tze0(qp /5dency should the circuit be driven in order to have maximum power transfsc;5 )hi/(pe1qt- gzkq p 0tqderred 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 resistancf y6 w (:0mplqcdbatr a2-fl+7e, 15.0 W inductive reactance,w ybl a-2afq+p76 ( mlcf0rdt: 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 circuitbf ig80i9 m7 fkk.f2nowls+g 0(l8fki 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 r:yhn 6mqxfs.fa .ks, 2esistance of 30 W. What is smx,f n:2.ay sfqk6 .hthe 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 seri3xdkr)jqq6oh77p f w9tb cgk40 j)h7 3ga bs/yes RLC circuit containing a 50-W resistor, a 10-mF 03qoj7gfghw j7hak/b3s9 )p4 t6dq xcry)b7k capacitor, 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 ai:bqg58 dj-ekyh(pl o4*bqm( 1.0-mF capacitor and a 15-mH coil in series?g8b54(eh i mk*q :jl(-q yopbd

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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 capac ;g* pkmoenqecg)ep,,+w99;gv xqb e8itor for a resonant frequency +b v*x gqn)9 8w;; ,e,mgepc p9ekoqegof 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in seri zyq42qev 4 wmef:1g33 si,hwy2cw jk6es with a 3.7-mH inductor for a resonant frequency of v,w4i zw3c2heq1mw6f: kg3 4j2yqs ye1000 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 wi5e/ cdbfrjuru .,rh 3i qz.m +(zj(5eeth a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be rrierede3.qbz /5(u5j+c z.,h jm (uf1000 Hz?

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