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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 following3cf,q z(gh30hwc 5j7wvgf /jv are units 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 inductz0+zl0 h kq0p7u:z zznion states 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 producespvrk (p 3 mg7s*imby0fz d- dpk/:8t0i what kind of change on the indup87f id :smmg0 kkyi drz0/3p-*p(vbtced $emf$, 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 strengt,t:otlw1 mvp 2h of the magnetic field through a loop of wire produces what kind of ,tp:2omv1 tlwchange 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 kie/wd iw qe8b0i9+55a zrcv+tz nd of change on the indu05+b zr8twiz cv9aweq+d 5 /ieced $emf$, 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 ekb6 qs2-.k0i6boku:m okvi(rm q0(z 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*x omo*5w04hj ( i; apvk 0ilyh8vi4al current in a conductor will be that which tends to produce which of the o5kjial40vo**wiahhmp 8(yi4 0vl ;xfollowing 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 horizo-cpbs 7) prepp -38dkgc2 dv/gntal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewc-b3pc)spvrg pkgd87/e- d2 ped 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 onv :lpw34e l:g ierbp-4 a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approache4lvpr3ig4:b e lwe-:ps the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vector pot+q35a(mr,j7 ckwnym ints straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the fw, mmt+( 7n5kqrayj3c ield 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 ) *jzw4k0b9q;*e f cf/;ojvolqbvt5e region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the fievw oq ;ofjfevq5)z/ej *9 blc;4kt0*bld increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnetic fiel*v8sz,3k ovghniih:,5 a plp(d points straight down. The magnetic field disappears suddenly. When viewed from above, what is ,8n(a,lpik*p5voihg:svz h3the 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 a horizontal tabl m2.a*7ft*eua tblr- ze and carries an ever-increasing currt* fue2t7br-l za*.ament northward. 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 norkfo-f7+ g85i,dev) zlseez:khz; )rm th pole entering first. As the north pole enters the wire, the ineeed f l;-zz7s:r5vfo) ihkm) kzg, 8+duced 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 rotas8t1pqfklg3zy; 7x -lted at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation i;87zg kxl s3p-1tlyqff 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 whose3fed(2n ov)ii8/ rase direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientatio n)r3i(eie f/osd8va 2n 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.p-mx+ q(( kn03x yt*ebnk/u cn
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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 qw;vjgzr5j* adz4 b7+n 8xdt7 on6h 1cthat 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.,4bfoq wx ce/2 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 in17nnw mzxh)*y9qr4t1ivsn: g the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced am) z1nh:rvw94x itqs1ngn y*7cross 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 angulab;)c:zes6v u gr 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 transfor:q mit3ce2 :igms

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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. 8num ::6c vp 6qfa(fuuThe frequency of tmcv8u pf:6 (f6unqa :uhe $emf$ 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 tot9bm b*ldmw kb0l;,iut 7+0dz

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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 uo yg:(tkf2v(cls i+nlp oc.o68 5io-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 moy7)umpsn*69,ota d ir re loops than the primary coil then tdnry a)mp9s i,o7u6* it is 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 cof6f yq,3tpcw3s z :1r9dupx4p il contains more loops than the secondary coil thenq63p3: s,tpf wfxpcz94ud1 yr 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, thr si)x3tqp u:m rql(7a*03vqb e power 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 circ jkpss(g3+hs0ku.m t/uit,

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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 as p :vy *;lxpn1t25uttre connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the batyup1s5px* 2ttl: nv ;ttery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of .(cdvg-e,ex v gvx5pt9niaw afig.,22,8uxo constant terminal voltage. At the moment, o,da f(nptxcw i5.uexv9,xggv2a2-egi8v . contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance 8dxkvs 3*i)/bqxg s4is.ui9o 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 inductance L and resistance R is conn4or)acrn.luw4.y 1cz ected 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 b zngypn)5jsx7b8 )4h*7jh no battery. The time constant for the ci)75)nh8 b *x 4y hbnn7sjpzgojrcuit 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 in6wxvxvuoqxj/8/ /4+jf* wvg u ductor are connected in series to a battery. The battery is suddenly removed from thefu vw8o/ j6+ xwx*xvu4/v/q gj circuit. The time constant 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 h 8;:wv4yb(g,dn+jgtev ofmk82t )k xhave 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 powfpz avo1; g0lr qek892aa e.c:er supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply.ka ,17h yea7*;aycj)uq7qdlt In this circuit, the curren7*jt )7qakdl;yq y,a ehua17c t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor wh/vv3j.noi ih: en the frequencyino ih j.:/3vv 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 acrh3i7a rfjpe3 +46 gwxz jdv nwt9wn28:oss an inductor is doubled, the inductive reactance of that inducnwvz7tjx8fgd:6p ai3w9hw j 4+2e rn 3tor

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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 a vj+( c4a+undfn inductor approaches zero, the inductive reactance of that nf( a+dc4+vu jcoil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this cirygy,e7 :c/9p qidwl-kcuit, the currentel qk-y: c/wd7 ,9gyip

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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 chh.cvyl+ *ck 9vanges by what factor when the frequencyhvl.c+*c9v yk 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 a67vkx;nj 6zbgb.x tq hl2g1;a cross a capacitor approaches zero, the capacitive rek bbhnt;.xz ;ag1xlgv6 672qjactance 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 h8 tr*rut ;q9pin a RLC series circui9rphtq;t 8* urt?

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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 circuit is defit5 o1d 8x y*rysxzksa: ;,x:bumvb5d6ned 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 circfwk*/xh a bhhkfy ,*;0uit. The impedance of the circuit increases if R increases. Wh h/ab*h* f;hkfw, ykx0en 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 circjd e2q /ls,6h.eamow) cu i2;kuit. The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit increases ift5piv.m).z vkq exo/. $X_C$ 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 capacitancex)i bnndd4e y:)9txx 5 l:b+g.z- mjvm both double in an LRC series circuit, the resonant fr+bl9 v mx ntjexig)4d.x :bzm-n:d) 5yequency 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 A)y (1p6e-gvfk6f(qu nhd0 aungh ; h39jddtf1C 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 circuit op3 gtur x)r 6-mjo u*7h0my. diov+2iqccurs 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,l4 -wms)2nbewr6 xc s uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vecwss,4l- x2 e) 6mcwnbrtor are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform ygov2vtewvy8rgpi ;*; i(6:q magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and o2:;yeq(i itvyg*8 p w6vr;vg 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 radiu712csz0x 0pywjf mgn:s 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic 0nygw 1 02s7mc:f zpjxflux through 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 red7 :fofn17y*t i2 aiwyyuced 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 changei9(v w,/l51 9fo.l09hpm z cpdpnslnss 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 s ktyilqa 8;x.6quare frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the c x.kqai ;6tly8oil. If the field changes 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 tur4bn8hzp cdxp si-ds;yvx3. qc3 (,o ;ons 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 areax t/p ,s8(oe 8hnf 9fln.faxa0 $0.20 \; m^{2}$ 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 wi2 ti74xxpun d,ng span of 60 m flies horizontally at a location where the downward co7p4 ixd 2nutx,mponent 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 angular velociooqld/n, oi )e..aur7ty of 2.0 rad/s about a vertical axis through one of its endsuo r/e)qon.d. l io,7a while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectnm :tsjof cvvs5**sb+vnw)*7 ional 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 *i8o mq. zfb3s6 1qntoturns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has h,z2*g,d iruow301nuxcz (a l80 rectangular loops on its 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,a 3u0,hui gox,d (z r2zwn*l1c 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 100ybuykv91 v(1q z(+ s0 wukqjc))uw k5q 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 si x5g.pp2* rjtc- idcf5mple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of t-c c52fjr.d *p5tpixg he 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)e ew,b.neuuvt +41uy37o jzl 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 opers dl/an c.c koqa8kjb)5 jov526et ch :,2xm4rates 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 r:q(m j 9/ocejg9ry (7/zyebimotor have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generate (:z7igej/9rb e /j(ryc9om qys 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 to344 lk7rfchujec: jr; a 24-V power supply. The operating current is 1.0 A. What h7fej;: j3kr4lc 4cur 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 resistancekg xuez27+ovsufis2a-/ 6 1 ww 6.0 W is connected to a 24-V power supply. The op 2ws-osf17kez 6uv wi x2+ga/uerating current 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 connected to a 24-V power su 11cq b)ml*zy ,)hmsfcpply. The operating current is 1.0 A at full speed. What is theq lb)m,m)* c1 scy1fzh 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 voltage ofj o;;dtxpd69q-ia bj: $120 \; V$ 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 transfoe4 wob.nau1dk anq/.: rmer causes 14 A to flow in the secondary. n:qa1awbon4 d.k ue./ How 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 the +2, fsitt) oct24-V secondary has 100 tu2i fo+)c sttt,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 and a 2000-turn secondary 4u/:mpp m fwj0coil. If the current in the secondary is 3.0 A, wha/ u:pmpf jm40wt 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 pri gvhsom,m x.q3v887edo/ 6r qomary of a transformer. Assuming 100% efficiency, h. m6ov7qvq3roe,o / 8xgh ds8mow 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 10.0 m,4cwr7 xp,ty,tqr4m f m5y6db A. The pb,fpd m y7t5wt 4rq,4xm6y, rcrimary coil 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 iebc569oq i4o its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primi4oi6qbe oc9 5ary, 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 and 300 turns on its se)b wio9-bgmt 2condary coil. If 120 V at 2.0 A is applied to the primary, wh)w2bob9mt -g iat current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200ecoj*t2k*thn/jx7 w ;,j) )/ smngz8wx 5tmvn turns. If t jtz/ *5jsgxho;wx)ten8w2mn)v*n,7kmjt /che input current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has eph9xu 06sg2d1 zh vk/200 turns. If the input voltage to the primary is 2u0sv1 6hg xpkz/ e9dh100 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 tra7 ncs8vzv9 l2+zssfjeqb3))ml d g5v; nsformer 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 to3vcsn5 ;z98jm) )felvs7 q 2bvdgz l+s 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 :ia9rgis)o* j u*ts.pV. The voltage is usually stepped up to 4500 V by a tran*.jus )ri* sp9 tigo:asformer and transmitted through a power line of total 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 a ( ibfyum,g7m//d tg32f1 ptcit 120 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 f bim7t/ (/2,gumyitgp d3fc1the 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 steppe2e+*+t8 ngx ckd;p jhjd up to 4500 V by a transformer and transmitj; e+hj 8t2kcg +dpx*nted 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 resb9dsfr(/b d: onj1o.distance of 0.60 W. A generator produces 100 V at 70 A. In ordrd: dns(9b ./1obfjoder 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 tot 3ai7cbj;xam v5xt/(pgbn*,tal resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of thevbntt a i(gmp;j/x7*xbc3 5a, 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 16) p. vzx9olzj/m:grp000 V. How much less power would be lost if the ovjx6)mlpz:9 g.rp/zpower 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. I7prgyfxke( ./t is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output.pxy( / egfk7r 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 e6pl b/ ,sttb6zv.j:,ssp dys4nergy is stored in the coil's magnetic fielpsj/tl6d, z6s. sbt y: ,p4vbsd?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor anp+.(2w,q om :teybptm* m q+wdd an 18-H inductor. What is this circuit's time copwd,m+ qm.m*eqb(2+ : p ytwotnstant?

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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 j.qr-: i2w+s.shix lg1(uxcfmw)ri 9- xq mp)voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. v-jy o 5b68mr qy+f2e3ap0lxz 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-V AC outlet. What is the resistance of the lou-y e jitg;qs1d,89fad 9i-f tyj q1sgeu8,o;mp?

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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 conne(dkzxui74 o 7vcted to a 120-V ac power supply. What is the peak current through the resisto ov kd(iu4zx77r?

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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. What is tkysqa* ) k*sx5he power dissipated in the resiy)s** kxqk sa5stor?

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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 4tdrsj:h: p2;s 0c1chw(qszwf*ksbh t l*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 a 50-W resist; 6mnz7 ,yn idf3ko/baor 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 1 s czjg+ 8*af-mae5xqspz6a3a 50-W resistor 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 inductor at 60 l t.,n vgknl-cgq4 2/dHz?

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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 of a 2.50-mH coil a6xhvfz09e7/ux pt il.t 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.i 18(6m p*ryrfv0 z3 dzd+kadi0-mH coil have 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 yy8f(7*+ts tpjyruw6 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 when3v;g g 1(mi,1p)myjs8 kqyb o 80ic,orrzc3t e 120 V AC at a frequency of 20 kHz is izy3 o crjk0,vq(r) b8s3eogyt81g 1mpcm,;i applied 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 c )p*b04 *cuu dtwlmx8g6pnw1ioil 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 (ld .clz.pe0:emfb, ereactance 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 nee +5keq+w6 fgic)up u;e sw0f;pded 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 reactance of 120yfsd (.g(q1c o* dl) x)c9djiz0 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be 10 iru,md,lqwts(l,g5.0 W.rtg,ulm w( q,sli5d,?

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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 +ha;f 5o9thgs7i d16 lpe+et:rdsf; i 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, 1 wytxljo*4pd8 cjh ;-05.0 W induct 8oy- tw*dph j0j4cx;live reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 18xa.cazz(w 29dmqv,w 500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connec8qmav(cwzw 9 x.adz2 ,ted 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, j,0iho t:a3f fzx;y/land 1.0-mF capacitor are connected in:j;fza /h0,xti f ylo3 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 serto ka9*8+f93mdaizxa:8by pk ies with a 20-mH inductor, what is the i89byozap:at*89kk fia+ dx m3mpedance 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 wi;x tpf;dtys1o /m t gb 6c9t0b0+glam5th a 20-mH inductor, what is the phase angle amt00gsopfm+cl1b 9 6bdxt /5atyg ;;tt 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 9it aaxq)y tjc.oe j*o59 w7/f20-mH coil and 1.0-mF capacitor 7q a )oit599cfxt/* jo.yeja wfor 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 is needed iiaa /-37sv ec2 rt lncsb, (vwu;d+-mun series with a 100-W resistor and 15-mH coil to get a total impedance of 110sdsi -n vtv2mc7uuc,aw3+a (ble;r-/ 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 4yg+jpc6 sttqsk:. 1:j50-mH inductor at 5000 Hz for a total imsp sy1k g:6.:+tj tjcqpedance 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 witau26t9nj hx 5rh a 100-kW resistor at 1.0-MHz for a total impedance of 150 kxun2a 6rt9 j5hW?

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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 connectr4(j*ypk/blq 3h) r+kml;p km ed in series with a 20-mF capacitor. What is the impedab43* mkljyr +q hk/p)k;pl m(rnce 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 wit3;e btjz: v 9lrx*- 7 w8d5,zpy lnlt)nme3qdnh a 10-mF capacitor at 1.0 kHz for a total impedj:ye-lq3l nnd eb8)d z5mxvrzn3t*wp ;7 9,tl 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 seriecu2qd e pd7+9js with a 10-mF capacitor at 1.0 kHz for a phase anj792 uc+ epddqgle 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/edikyv( 7 6n5)r l z)uda2ltc in series with a 30-W resistor at 1.0 kHz for a total impedance o7)un5a y(ce2 k/lrz6) vtdidl f 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in , 6:::rzqd ctiamwl.wseries with a 100-mF capacitor at 120 Hz. What is the phaser:,awml qcd.i6t :wz: 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-ak z6p7hon q.zer04t2W resistor, 20-mH coil, and 1.0-mF capn q o2e7p z.r046khaztacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 106fzv u 2of d,)13vkt8jlqpu b9.0-mF capacitor, and a 0.350-H iz26l8juko) 9 vv,ftufd1q pb3nductor. The circuit 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 capacitor of capacitive reaf;(qc8 et4ai5z2aku nz4d vd.ctance 30 W, and an inductor .k(4dz 2fnut48ca evd; 5qaziof inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resistor,,pmuym/o/ nio w ,g71m a 10-mF capacitor, and a 0.45-H inductor, when connected to a /mgio7,mnpwou ,m1y /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 p g)s7f/*q6vsb8r ytoohase angle of * 8 foos/ v76s)qtgrby$40^{\circ}$ 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-mH60sq1 i091 jr6a+txdekdt tz d, C = 10.0 mF. At what frequency should the citdtxrks 0qeaitj6 1 d06z+19drcuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit withj5c*h ;e tk8xc 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit iskc;cx j5eth8* 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 is.3,ifzyfr5bk:8i e sj-w ib7u $63^{\circ}$. 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 hpvx 2 +tjf,p+sas an impedance of 60 W and a resistance of 30 W. What is the power s2 f+j+p,xt vpfactor?

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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 circuiv(om *n. s:nsth55m fxt containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, whe :.m s5 ovxn5s*m(fnhtn connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in seri0sistkk 4kl325w.nq7ly/ adtes?dlisktsln t503k.k/ 42yq7a w

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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.px fg4 9*:1s8 dxtednp7-mF capacitor for a resonant frequency of 10xddn941 p 8fsxpt e*g: 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 series with a 3.7-mH inductor f7i8p5m javb; yor a resonant frequency of 1000 7m y 8vb;5ajipHz?

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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 withdqnk *l ,(hxoqjtk;b tz(ne8 h1*)t j/ a 30-W resistor and a 40-mH coil if the resonant frequencyoqz)jhb8 t/ ,ke*;xkl(nhn 1djtqt*( of the circuit is to be 1000 Hz?

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