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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 ak:nn7i*pi e.zre 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 inductiop9ezll( + 2nlp+i 6ovvn 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 wi5iu5te).e qwkre in a coil produces what kind of change on the iee5k.wut )q5 induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire prody7 +hi2;rvcf iuces what kind of change on the induh2r y7 +;cvfiiced $emf$, 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 o/3uyrcef;c5 d qg* )ji k,g:bvf a loop of wire produces what kind of change on the inducc:yq)bif; dkv5*r,u3 gj/cgeed $emf$, 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 fxi yrfv b-rx52+ 3a64 ouwu7ymrom a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in as284cfp jgw2b conductor will be that which tends to produce which of the following effectw2 fcjb 82psg4s?

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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 hor5m1 a7wpd 8yo 9 )on6nn*kyvbkizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magne9n 8o kvy6mwy)pk7oan1bd *5 nt 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 magnet is held abouf0j29srw+d *s w17 iwts -bdove its center with its north pole pointing down, and released. As it approaches the coil, the falling magne+uit2 j09*s7fw ww1- dossdrbt 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 au/ky3k yi x/8q region where the magnetic field vector points straight up. The magnetic field v/xyiq /uk8 3ykanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region wher(itk5stk w lx3r9(nazl7pokwu.c,0 : e 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 cowopxil(:zk5 .0at(k7k3 ts rw9,nlcuil 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 wherfq82g skh6+goty (ha6 l j5n+ke the magnetic field points straight down. The magnetic field disappears suddenly. When viewed f(qn+o6l y5j2kgh+hak 6s8 fgtrom above, what 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 a horizontal table and carries an eha9iy79f:xs ab ng15 l/6aaq xver-increasing cur 6 /abi71a9fx ay9l:ngh asxq5rent 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 : p9jjiz;-y cjof wire with the north pole entering first. As the north pole enters the wire, the induced ic jzyp;: j-9jcurrent 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 angular speed about an axiss,ku 3ah wo8q(ib. 38wxmc(vf whose direction can be varied. In 8xosa wv,q 3 mhuw.c8k3f(b(i 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 angugmu450jp*s(55 tkoead yhq e2yux2s7lar speed about an axis whose direction can be variedusg2 x*52ed0sm5uk5oa te4qjph7(y y. 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 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.gb+nin +vht 4.
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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 thro :.km-f/ )hzsa nll6m y:h/qat 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 9gsy +ip7(u. ocj 4s,ml+o u.;jrfn0k1 wwqoma magnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west dir/x h.wztv8bl:g p:(xd 05 hmmhection) is moved northward at constant velocity through a magnetic field that points straigh(wv g x:/ht08 hpzdhmx5l:b .mt 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 bnhbm +0j+ks4e ar rotates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generatorg mw:liv9l, 5sz45 id*y b-qsq transforms

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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 secofiusw ,m:wh en.r( 4f1nd. The frequency of t( .s, hife14nwrm:uf whe $emf$ 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 t12 dlh nzk-z6 0qrdfx)o

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device thdvfdcf 85a -)u2km+q lat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more 5kg2mx1 pnz-l o/ h5pwfpa-8r loops than the primary coil then xag-r 5z18 pk-2lp 5/pm fwnhoit 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 th ramp-7.g8(o e j2enkle primary coil contains more loops than the secondary coil then it ik 8-.jln2em(e ra p7gos 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, theqma +:z yyp0et5:0 f2 cr2rejb 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 ci)ggltry-f8:wj tx-c6 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 inductor are connected in series to an ide*;sk;yo 5rph15 hzi:fy p;n pmal battery of constant terminal voltage. At the moment contact is made wi ;hs15zypr mf;yn5i;h *:okp pth the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor aree6n* 9rzhj z4v3gnnbyl-bs m2wp; (a2 connected in series to an ideal battery of constant terminal voltage. At the moment czg 4hjp bn-9 rl s;na2bv2 63mz(wyn*eontact 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 L4vy +ug49t6ah 5hav kp 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 resiskdsg.sg -ur) 1tance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The wqlgzr ,wicjd)bdjo-,r+21e:ea yoo3i34 4e time constant for the circuit represents the time reqri, r w:djzw)eqo 4o2j a3ioc ye,+3bdg4l-e1uired 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 2lrok 84jdzqzw(li;x 65- z fp81ivqx are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the cir z8 zr lpwqz( 5j2ixvi-6lkq xd4f81;ocuit 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)pa+ *egmp h/rc)r x(i have 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 powq0s +xxdh 1g,*3jd i xy.dv6,ghu jx1xer 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. In this circuit, the cur- s6lg +k6 a3vjqi4drhrentl-ra3svdj4q h ig+ 6k6

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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 ci touyoqcc-e a:f krlscz:f(*;(/pv12rcuit changes by what factor when the frequencztf/*1opk( uco ;2e vf(ascrl:q-:ycy 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 tb4 6d/ppg8txhhe AC voltage across an inductor is doubled, the inductive reactance of that inductot xbh648 gpp/dr

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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 ivu1i 5 ,4lx,bb2kyiz tnductor approaches zero, the inductive reactance il2 yx,bzbt ik1,5vu4 of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, thf3fs)ru)r/zz e currenr)uf3 )/f szzrt

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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 an6y ux0le 3iox6wo 3xk9 ac circuit changes by what factor when the frequency is3xlo6 0wuyei6kx9xo 3 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 n1 d86ud.tce;5s vwd lAC voltage across a capacitor approaches zero, the capacitive reactance of that capa u8.6cldds1;dtv e 5nwcitor

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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 thgs:jbj zh6(k w t/mb18e inductor and capacitor in a RLC series circuij6zh8bm j b(gwtsk /1:t?

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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 deb5xg/ym ,2h,cygad5 ofined 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 imped lko)mu3/ 8sf rii7:0fn4pwevance of the circuit increases if R increases. When is this statefn 0e )kop 7/si84mi r3fwv:ulment 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 w hydo9zpn35x*y:u4u 441 -v qtuoaazcircuit 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 circt mu5oyu,brm r6i8() fuow+(huit 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 circuit, thc zq f*lup +6 m)0x(evjr3dz-de r +q-f0e)u rzdm (jzclv3p *dx6esonant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. Ati.w/ew18yw/b if2,i3nnd.q kk*+ s x6fx n ijc 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 m 9i2n73gopa-ff; rvv circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a unh(jst * 1/bxka r4zcz*iform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic f*4kz hrj 1*(zsactx b/ield 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 radiff9*o;ouwdf3vn (h:l us 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and (ff*vnfu :9wo o;hd3l 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 pvxz))7 qs*9yzxa4oz h 7p-tg0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vec-*zozqt g ys 7p9xxa7z)pv)4htor 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 sinn fr-rk+m ik :olf.go30 z;1zxgle loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes f6 de oviinb1d:0l3( zrrom $4.0 \times 10^{-5} \; Wb$ 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 framh c2l8 82(x3ybqdsc,rjuns zi7t hs 4+e with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from z4r7 bq+h2s3c,nhjx s d8s2 yltui 8(c0.50 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 area of i1a -j3rx;aihc,5obib *rr7v $0.40 \; m^{2}$ 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 arusmx/((vigghx8eo ,cni, 0 .wea $0.20 \; m^{2}$ 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 l8 p ej ;t 1of-vu/tu)* zs25rsfboc-biocation where the do corsb 1t2es 5ft-i p)u/jbvo;-u8fz*wnward component 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-; g:oq6 okz4evk .82bs, ocxmz6l sau at a constant angular velocity of 2.0 rad/s about a vertical axis,k4: xbuq6ssmov ;ao2z8 klcoeg. z 6- through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-o33g1pgc-k1nt rm5o5 rfi : wzsectional 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 consist/9 etn + 3 tnhznu5p/-oantzq;s of 100 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 $emf$.

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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 loop ish4rd4e5xp tmm zpv8e 3,+ lig*m o7vi. 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis pa m 7 43,eeivdo+m* m.gtxipp8 hzrvl45rallel 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 t3z wi: 0d*kxg100 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 output of 12 )6dk jov/40qk 2l5ae:bkjzsbV maximum when rotated at 60 bz/0a4ksj b6)veq:do5kj2kl 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-koq8qur+e /hf39cv zbgdl.c2z /4 uk 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 resiq:4f e(cxl+:o8a en ocstance 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 iusw 6o) 2 un4w7yi/gamotor operates on 120 V AC, and when running at full speed it generates aiu a6 4)sgouwi7 2yw/n back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V pis3m6f4c *medfv:v x8xdk 2,k ower supply. The operating current is 1.0 A. What is the start-up cur f6 dxv:4m mc,fi38de2ksxv* krent?

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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 conndl) qgfhi- 4p*ected to a 24-V power supply. The operating current hpf*-) gqd4li 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 resigmpzg,:8hndl,2l zxd8 b(p 7dstance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is thzg8blh2xz( d7mngppdd,8:l ,e 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 isfh4dlf yr*lx-i, *0/o6h jwtg 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 ofk;k 7kmdpgy-; a transformer causes 14 A to flow in the secondary. How many turns are in the secondary;-kdp kg km;y7?

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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 ix8zqwl1vm*yru t ,f, 0f the 24-V secondary ha*rm l,0ftwy 8q,zxu v1s 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and as9. q6z6jznw p 2000-turn secondary coil. I9njz 6z. s6wqpf 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 primary of a transformer. Assuming 100% .pg ncnjrp *(v2rku ;)efficiency, how many amps at 24 V can flon.jp )*;pc gkvru2r (nw 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 u(cws6d.k lina 83w(7,erb,8j f qwbla neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What dows.8c fw,e q38 jdn(lwi, brk(aulb67es 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 turns on i7*dr qok9bkd(fp:5jsyjt ;td-6 0 c pjts secondary ckp prjoqyj ;9tdf *6dd( c-5jbk:0ts7 oil. If 120 V at 2.0 A is applied 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 on its primary coil and 3i)y ;l qx55hy3ite5if 00 turns on its secondary coil. If 120 V at 2.0x5f3t ey;yi) li5hiq5 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200f8p6;o- f *tf4ovkwza 3sw7w x turns. If the input current at the primary is 100 A, we can expect the output cukf3os*o ; vfw8zwwpx -7f6t4arrent 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.62syl4t. rus;1jx z:)sqywte If the input voltage to the primary is 100 V, we can expect the outputl)j2u61srty:.;s xzswe 4q yt 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 and its se7h7ong wo 6d.9wgrtavf ;-p c/condary has 200 turns. If the gw .; p a/fh v7ngor-7wdoc69tpower input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 /e.-5adw t7mk3l lqik 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 number of turns in the seconaq3 kl. w k7e/it5ld-mdary 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 6fxnakrk- 2)pi1e3i c2s0l. cc0 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted througc ari2 2k.i-1s) kecf0np 3xclh a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at ss65i86b- qfkvwd .qz 120 V. The voltage is usually stepped up to 4500 w q5f68 kv6qsbd- .zisV 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 lio(di k+ s(mvs4ne 50 km long 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, the voltage is stepped up with a transformer with a turns ratio of 1s(o dm(s4+ kiv00:1. 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 )osj mc zhdw1 gd048v6 -;tpwaqtu2+gka0a:s km long 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, the voltage is stepped up with a transformer +;k gd umsvqwo:adjg psw4c 601t-02aa)8 thzwith 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 linaqb211w v2)van upq ln (yqf*4e at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead va1q4(qfupv1l*qnb y2 ) wan2of 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. Itxhw4 +uwq -x 3vudv6lg:zx59t 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 transmissiow t4-u 5uxl396xg zvwhdv :+qxn 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 c1ft-n.vvq koao,tk2bg * i/h6urrent of 5.0 A. How much energy is stored in the coil's magnetic field?q1khn6obv2go *vtt/f ik a. ,-

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. What iyk;r*qmo:c 98h 0pn nl -fwbl6gbg1e .s this circuit's time constan9olc r 6:nm0g;1 bqefgh*w.k-b8nlp yt?

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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 voltaazz) ir ybu0t; 2mk+y:ge in an AC circuit where the 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 AC outlet. Wh+o91wic/vyb p :;g,ctpn lq 6bat 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 ou ey(ez)/l8*i y9lnpbpe e* (xitlet. What is the resistance of the lamp?zpe* 98*(/bpe ene iy(l)ixy l

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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-x qstr nyt(c2w 74c5(e ho0i.yV ac power supply. What is the peak current tyc2s yoqx4 0.tte hnwc75((ri hrough 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. What isl.ga ++.jlr1t b dkf/x the power dissix rklg tf+.a/1+.bljdpated 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 iuiypvu5+bv 6 yk4 .p)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 resi8gzp ;.bns(i8 :wvr+w 5oyjj 58xmxjestor 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 req1 m5v(-;p r yznm+bmk.wku v0sistor 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 n4scs4,ei5 br.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 of a 2.50-mH coil at 1yet4f7.b 2 apw1l;wmhczz.4g000 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 w9k h h;w;6mmv14.0-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 for 157 W of inductive react)zh74s*pl7tj:ron n*y)mz o pance 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 insa4 *vum dm9ldm6naf3 .nh.kz tm.3j 6 a 60-mH inductor when 120 V AC at a frequency of 20 kHz is applied .alhm9nsa346m mfzdmj 6n.*kvt3d. uto it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due m )s .d1r)t/l s/ 0q-tfjiedibto 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 capacitiv m;0h) h3ojmzempto1 5e reactance 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 isfbjy 13umld- 1 needed 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/qcovbfmqdj v,;-u +7 capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be 100 Wr;clz 9f-xtwb+ pdk0nn5j4w 7?9cwn-dzkfn+ 5 t;lxj7wb 0rp4

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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./y5jnz6f8:,cj*+ka ,c feb smcg tnz40 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 , cxv; cphla t8c (5e,kjc11xwwith 12.0 W resistance, 15.0 W inductive reacta5x;tkcwc, 8le(pc c h,v1jxa1nce, 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 a d8 qwp 3,kmkp4,ajkf)t 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connectedkwd ,84qpmk ,f)a pk3j 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 ps1x7rfov+n3 a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connef +xpno37r1 svcted 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 invk5o 6y wiu4,w series with a 20-mH inductor, what is the impedance at 100iw uv5ok,w6y4 0 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 seri .eei d9ynt.)ies with a 20-mH inductor, what is the phase angle at 1009dyi e.et.ni) 0 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 sruf;v o 8slr.qae;95a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 oel vru9ar85s sqf;;.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 capacitanc*qzh( xs 51lsues is needed in series with a 100-W resistor and 15-xl* hq1 sz5su(mH coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductf cbq9tf.9an 6x64t/g,(gsr q3chfnlor at 5000 Hz for a total impedance of 4000t9gr(4h nf/,c6f 3bq aq lx.gcftn9s 60 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 p-)ugvt g-p5 qgmy3cttjua +w9z04 q*at 1.0-MHz for a total impeda)w+tgt-9 uptpz uq4a yc -03gj*v5 gmqnce 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-mF capacitor. What isxsix d a( xofu3)q35u, the impedance at 1000 Hzq (uaosx,d uf) 5xi3x3?

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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,qg jv(txkq 68dy a:eopj704f kHz for a total impeda7gd f yavxotqj 8(:046kp qe,jnce of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at vurw) u0m 0s9t/wr p;ss:c(nz1.0 kHz for a phase angler zm s(:u/csnwws ) 9vtpu0r;0 of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz forr gmxwvi15 p--w txw/fg8 l2xh 8:,gkp a total impedancg-wl2gtm18x rg/ - v px,h8:w xfp5wike of 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 series with a 100-mF capacitor at 120 Hz. What is the5c6xgm ol/z+hw ph 5 z3qj,i.u phase anglezgh5 xhqip lu o 3,mz+w.5j/c6?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, vyt 1qdd8) j8vand 1.0-mF capacitor are condy tv18dj) q8vnected 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 1002r q7s4wxiw 7+poota .0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms curreos7t2+ xpi04 w7oqwra nt 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 reactance 30 W, and an inductocp a5l.ow ,q7 8brsc(:vg7)cupem2 in m23xf jr of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power(vj772aogbi mf cmx3c5,pr 2n le).s 8:cwqup 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 contazd1vkf y*ohh/,.xvp /7)hc xw .inn.oining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connectewcnnx) zv/ pvx.yo*f.7hd1kh i/o, .hd 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 ysu)1 f d6s-bgwdn )e0resistor for a phase angle ofsdyes0 f1 )-)u6g ndwb $40^{\circ}$ 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 io1j9 gxv9mc.has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in ordexi gjv99mco .1r 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 inh 0 wxr:ml:wo,)gyn (m an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power su)n0 hxgr wo:yw:,mlm (pply?

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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 j8;h 1g4oo tmwsb :k1r5s 7;f/mccaksAC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an wz9zs ey/n;*rimpedance of 60 W and a resistance of 30 W. What is ;zns wr9ezy */the 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 u ub*b1:umjt 4series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz umu1u tjb4:* bpower 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 capacitl4k/ 2k/a4.u wvyws ekor and a 15-mH coil in series?l/ s ue/kyak2v4k.ww 4

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed ic3p1u 02bjj pd; bkv:d7 pzvl7n series with a 4.7-mF capacitor for a resonant frequency of 10 kH vljp2 1:p3z;bkjvd7 db7uc 0pz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a reso3r oca d11av xp1((vum3e ok)anant frequency of 1au(3e3m11 xp dokcavv(o)1 r a000 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 m6b p.r )qrid)y;j nw/eust be placed in series with a 30-W resistor and a 40-mH coil/ q. r;6 d))iwbynrjpe if the resonant frequency of the circuit is to be 1000 Hz?

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