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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magn+v1/1f(o5xr (hnz-znow 8edf(g pw wqetic 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 states thazj o6a6*k0qo k 7d7zmy5n 6pohuq+0wt3g.jfk t 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 os17o4hhynp1fk/5ar7 ae rjn 2g xho07f wire in a coil produces what kind of change on the in107a7o 42nr5/1nkx sjh eahgf7 ophy rduced $emf$, 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 magneter z..b u m)ze3d;f eib7wnrzg3e94/iic field through a loop of wire produces what z3ebw rnbg3.ree ./ z4;d7efimz u i)9kind of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change l 8de :4l fm4rqu6awd6on the induced 8lq 4m6ldfw 4:e6da ru$emf$, 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 magneti1co29 we*teplc 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 curr mlxa2tq7fylr(07-3m uzreo 4ent in a conductor will be that which tends to producl m7ul (e oxf0ry2r-3za4mtq7e which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal tab*pi90cplj0h h n5 7u-rux yyn2j)p)gale. A bar magnet is held above itsnhx rapupi)7)hjun25lg p y00*yc -9j center with its north 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 magnet is utb wv3ltr*0 r/eys +h31ks.r held above its center with its north pole pointing down, and released. As it approaches the coil,3.u svleb*rrtwkryh 0 ts1/3+ 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 rp 7mst0* 5yh219 l zfrxad7eyhegion where the magnetic field vector points straight up. The magnetic field va ylrsm *t hpa9fh0xy7d52z1e7nishes 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 table9pr puodn+g9:.lut1m top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the dm1tu +:gpd 9p9n l.rouirection of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnetic tk ju25nthyi./ q kcsprn+3r4 5tpe91field points straight down. The magtjt5 h 5n9ye t2rs1k4iuc nk+prp3.q/netic field disappears suddenly. When viewed from 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 ever-increasingv9tb.dkpn qic6ddu7 xfgl c9v/ 8,3a( current northward. Two coils of wire lie flb83nf6q9tv ik, dldd/u(pv cax g7c9.at 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 thrq3;em wh; k02w/- hn wt3ocyjfough a loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed from abowft3o3 m2w yj0kew;-hhqcn/;ve)

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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 rotatwl/: t, 2d:rsg7akbrs ed at constant angular speed about an axis whose directio rw : 2,klsgstb:ar7d/n can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constahk7c dt-,tdnwgp v:1;lfh1b* nt 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 i1fng-cdkv:* w1htl tpd; hb ,7f 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.9jqs ojwh9+7z
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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 that an evs5h,o ag71bn - nij9$emf$ 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 fisikhe/d0v 7q 8jl5z)seld. 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 th6 y./c++sce zj lwfei (dj(k+ 90kiwlee east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential indufsdij+ki+ej(0ey ( wczec.l 9kw 6+l/ced 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 rota, m axgasg(ot9or2ib371 iamo6f 5ob /tes at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transfore02kualh1 5 xoms

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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 r(i+yx lgsus2+ evolutions each second. The frequency of t2 u( ++silgysxhe $emf$ 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 dev: 5 ,iwbqt(pclice used 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 devicitpprl 1 f1n56*djc7ne 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 secondarywcr:55 tssqp3 w ojny +g*u7-k coil contains more loops than the primary coil then it is 7r55wq - +c nsoky p:jgw3*tsua

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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 s5sl ca s(im;j6dsnm :25 xd6lprimary coil contains more loops than the secondary coil then6cndd 2 :lxa(ms 5ljs5ms;is6 it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the poqt- qy*6af k2uwer 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 circuit+vtv:f tfg7zn*ot/bgu 7a9 2x,

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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 inl4i5n9wuyv mioon4 2 7 series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acn4i7iyo 2v9w5m 4uo lnross 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 inductoq,0yq7,17jl6oj pzyn; u s osgr are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the batterl7zqq1j jgs y0so ;,pn7 u,6oyy, 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 L and;x-2m(+ eqrj hj6zs rw,ui9wk ymjtfs *93w2d 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 ev3+3f(8,rrj4ol(tx ka;de n )sn fulwith inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time u3*ju-mqds s .constant* .dss3-qmuju for the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connect. t8czn2(* bdenmg7 yged in series to a battery. The battery is suddenly removed from the circuit. The ndz(7 yncg*t8.emgb2 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 have the s6 vu 7t71yo1w5mxpy hxame 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 tywbezq n;n u;nv46i,s(+ k+nq o an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to)-* ovy qyi5ny an AC power supply. In this circuit, the curreny5on*qv)y - yit

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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 pma9bf oyj;f1f 0)cz5what factor when the frequen fmfb51yjf z9 c)op;0acy 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 voltagy9 iq/dmk5ugu+a d/g *e across an inductor is doubled, the inductive reactance of thdmq+d /5gk* ia9yuu/gat 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 acs;;b/9oca2q wpzb -du qi,ek, ross an inductor approaches zero, the induct, d-,9cp2;b wziq ke;a/ ouqsbive reactance 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 circuituuqhi l:rjrx93 /a :om;,ut+g , the currenau+,t: 9qx/:u; u oirjrgh3l mt

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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 chan0 n2j6svbh +o7r9/xu j+b wgeiges by what factor when the frequenc+ ibvh9jsux/b7wn0 o2 jg6r e+y is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor appro f59; ai rwsm7r9xu-1,cuemze aches zero, the capacitive reactance of rzf e1cius7xweum59;, -9m ar 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 andvn +p80ar) e 0.iqprn rk;:hke capacitor in a RLC series cir.r0 8qnvr p);+kaik hr0ene: pcuit?

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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 d :ltp+,kkw 5hag,a *v.jnox y3efined 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 8g3jozywv. 6 sthe circuit increases if R increases. When is3z 6w.ovsy8jg this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impe:l94h paer 86bgvcl/ fdance 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. Thel) 1* bfb f0myo9ob7cn 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 serisv2xz9/tyfl( xl wu2:es circuit, the resonant frequency of that circut2(wsyu29xlxf /:l z vit 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. Atu*ts /pslw n6kn.b +x5 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 RLca+(kt46 mt.opp u b,dC 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 uce/t4cb6zv5 g2bb*z e)j 0sgvniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loopc gs/t56j cgb*e4)0zezbvv b2 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 rotj/qo4dgpsyh j/2uk 3 ;ating in a uniform magnetic field of 0.20 T. Find the magnetic flux thr g;hy4k2j s/d uq/poj3ough 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 00y2 bls ukyxi8v35tq:)ozh 5 v.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 yukl2sx bi:5 o)tq 85zv3yv0h 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 areaqx/zk du v f.q5wda;tn-83+ xa of an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes i; f3n)yvc oo)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 * ejc/3c+zyqm/f3wft* nye 2fuxd3, zquare frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, fin/u2/yfcx*jtnfzz e q3c*+ df3,3 em ywd 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 turxkbat*3n nyk) ,6 ckob5ez+q, ns 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 aq;xla2n;n uzbaf0p ,0g* k)uqrea $0.20 \; m^{2}$ 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 horizz 0mr vcrfv;32ontally at a location where the downward component orm;0vfcrv 2 z3f 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 rotlnrl4n u m;*h hgm**p*ates at a constant angular velocity of 2.0 rad/s about a vertical axil* 4*lhn urp*nmghm*;s 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 hab2 zd2 tigtz:9s 50 loops 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 cons msf, ) 9 +xe),uvpio7,+jzsp wel4g gf7rp3wlists 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 ar16y0,p95mjamt d kgcumature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to56 ya9 dgpc0jk1, mtum 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 100dk /0eij/ 4gbx 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 amc r+az fb418a simple 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 afbc4 a 8r+zm1of 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 genera2ilm,4blm l8ytor with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor opera:n5v,i3y 5/du gbtu6rcub o+ stes 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 motve 2jm /z;,0s6lnjzyvu6th j7or have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it geners,z tvmnj 266lhyez0jvju / ;7ates 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 (, qdl2g:;d hqo6g+h e; ynpkkconnected to a 24-V power supply. The,g; qdeok(h+ylpgd2 n:hk6 ; q operating current 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 resistance 6.0 W is connected to a 24-V power suppzrw4js+4a3fr- b dc0c ly. The operating current is 1.0 A a3rra bdzw4s+ 4jc0c- ft 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 ,5guny;al +.k/ p1brqjh *voysupply. The operating current is 1.0 A at full s; b+.j a /uyonq1lr5vp*hkyg,peed. 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 9kunu/i9*-,-fzrm it( ksfzkage 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 b0; z2 i* v9g3tpamrtaa transformer causes 14 A to flow in the secondary. How many turns are in the satt; 30*pg9i ma vrb2zecondary?

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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 1oh9. rruwq/2o 10-V primary if the 24-V seconrruqo.9h w/2 odary has 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 a 2000-turn :me-hqb yai0:6y e(vnsecondary coil. If the current in the secondary is 3.0 A, what is the current6:heyyb0- :an( imq ev 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% efvazt79k8 wvg6s7mv * blk 8r;yficiency, how many amps at 24 Vz7 vrbwa;ymk6 l8k7 sgvv98t* 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 1l8 ;oiz7qjc2a0.0 mA. The primary coil operates on 120 V.ic;7oa z2jq8 l 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 i1d nft wn4vt2o:twb 7*4q8b nfts primary coil and 300 turns on its secondary coil. If 120 V at 2.0b82wf4f1ndvbw4:* t qn7 nott 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 300 turns p/k6)9k769nijdsgx hboe. d a on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is presan7d9/d g6kb6 )kh.9jspeixoent 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 200 turns. Ife0*c0ta q9m 1miyi*;vdjfk8s the input currend0tj*8v ak9 icyqefms*0 i;m1t 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-fk3sj,chymv2;8 frp has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondsyhff2-jv3c , 8 ;rpmkary 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 transfogbft n x8dxl3xn15w .*rmer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional l 5x1ltdn3x 8*bfgx .wnosses)

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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 voltage is usually steprbe5sab2 vc q x:iv7ti,/s/k1ped 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 secondary if ts :bv cs/v1 /e5xqt7abr ik2,ihe 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. Thw uhzh.ue0a;896 rm2fux -xxlkz 50iue voltage is usually stepped up to 4500 V by a transformer and transmitted through a po uui8h2 x-x w9 kmazue;zxul0. r60h5fwer 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 ozynbmkxs8ab.zz jo;j;j(/j7 o/, r1at 120 V. The voltage is usually stepped up to 4500 V by a 7;rx/( ay8ks/b1nzoo j;ozmjjj .b z ,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 hc(hu:om qi:x o(0ige;as 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 transforg q(;:xi(: ueih0omcomer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance i1tu-cv *8jpan0nl n4::mutmof 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 trans: i-j pnumtnn uct*:81 mvla40former 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 1000 V. How much leck3ol5ot *rq9abuyo 1 5nt,yl91urv ,ss power would be lost if the power were transmitted at 3000 V ins,arcqylov1tr 5o9 n1, 5ou9by3uk* tltead 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 Viix95sos7mbh q1 2x e8 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 steppedseiqx1o h79xis5 b 82m 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 currentl zb3z +5be6zz of 5.0 A. How much energy is stored in the coil's magne6e zz +z3bbz5ltic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor.(f:-i vz) cuz o,uw3zn What is this circuit's i oz(v,:-fw z3cz)nuutime 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 voltag ,d(esar) ecs lo,6aat94,ku aslt)7ue 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. Whatry svy f6/2rlh5bl .e)w cv;,a 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 outtok; a7t;;-rrkcw czy:h6i) c let. What is the resistance of the lamp k;;t;wcr:-7)h6ykrcoa c zti?

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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 power supply+aimfo*zm lo oqhiy,.-s:, v:. What is the peak current through the revqo, iyz am.lf:so:,im-h * +osistor?

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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 aclp1w1gwl*l*b8 c rk. r *omaxes;d *l7 power supply. What is the power dissipated in the resw rpor sal 8**kbwlm el71l1 *;g.*dcxistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor,. w,qsnza*qp 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 resistg* rx66,0-m b:s6fjx wp cc* 9thldrdtor 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 50d/ gb/-nu 7i:ssa b0af-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 5w 2cacf(nuu)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 100 so4df l*8ocpwz(g9j: 0 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 +qhx-+ + 1 +dufablvaa-/vyadof 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 reactance at 1000 Hz?(n+ti8 ym- 3idn* xufr0bzo o.

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency og1,n b*brdhha , yrp.:+1j aggf 20 kHz is applie, p:gay11a+ ng.bhrj *rhdg,b d to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due torrc6 pot* kdj,b39( xbbb/ 7 ozz+cm;r 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 capacitive6oij /vu+ 9*dptt- 4ywecryj f03a(l b 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 is needed to have 50 W of capacitive rcyoz:5 bk2coxa0 e e0g2,bt u+eactance 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 reactbuf.b2nopq3r 6o:8cq 8 dcp 6xance 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 0.010-6:hvpx p 4.d*8ray*hyors su 5mF capacitor be 100 W?u:yor 4x*.v p5ph adh8*yr 6ss

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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 cai8bx3; gz srff :z(pb;pacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 1y ;:ka0qpe- luhzai9-2.0 W resistance, 15.0 W inductive reactance, 0-pa;ku qiyel9-a:hzand 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 1500 Hz if a 100-W resisrjgwa04z4 hd 6 )rc8qstor, 20-mH coil, and 1.0-mF capacitorr qzcg 48h 60sjd)4war are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1506e -o)aw hk1ku0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are c-6w1kuh ka)o eonnected 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 conne.;kww;67 kvh( qp:shnvg.fgfcted in series with a 20-mH inductor, what is the impedance at 10p6s:..; h nv(g7gfkqh; vwfwk00 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 seridfh4jlo; .k w0es with a 20-mH inductor, what is the phase w;k o4dlfj0 .hangle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuio sgu,s1(qyk/cf ny 3*vo-gyo1 j)6wat with a 20-mH coil and 1.0-mF capacitor for a tgc -qjyn*ys u6k3w,ofvaos 1/()1yogotal 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 in series wie6ilw(b.-0whtmj aviy s, nkarc;-x, 6k9te7th a 100-W resistor and 15-mH coil to get a total impedance of 110 W at .9n,ay;ctiwk k(xt al6 i,w6-jhse0-em 7vrb 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 inductor atiqd vb,ad-e) hg.ka 13 5000 Hz for a totakqdv3,i g ab1. d)-eahl impedance 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 wjp,*a5xj 66g4sk8 4pyf xkibgith a 100-kW resistor at 1.0-MHz for a total impe 8jy*gb6gj 4 pxfpkixa5s, 6k4dance 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-akvxt jd9z,60 mF capacitor. What is the impedance at 1kxz,6 jta9dv0 000 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 seriebf -w3 soj9rg1*r4jnxd8 6 ndks with a 10-mF capacitor at 1.0 kHz for a total impedance of913gnf8ds b4-wjxko6d *nr jr 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 1.0 kHz for a ppj,5stlm3nqr5xx oam2j6 ;2oki)w w r7 - ug2bhase angle oi2w5 ps a x)2-2,lowqr;mk7rmjun5gb6t jx3 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 resisf z+ /yi0s).hazaffabvj.ga v39 w)s; tor at 1.0 kHz for a total imawsb +)z. ah. vsf 39ajavi;/g fy0z)fpedance 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-sr znf676u;tlwul; fqbk 7r1) mF capacitor at 120 Hz. What is the pha;fu7snz6u )kw7lr 6t q;r1lbfse 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 r9d*uq ;8 l/fw0vnxe*n( n4cceqpsc0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitdveucqc;*90l0/ qp n*ex fnncw 84s(r or 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 10.0-mF capacitor, and vwebul)m/t(ct 5e(d0- p +llta 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power su)(b- e /etpdl0 ( 5llwmt+cvutpply. 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 cap,ij w 84 -pymss0t/bqxacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What cusi-tq 8m yxp 4/wsj0,brrent 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 cw0t9 bs vscq: w9*j0np otrb-7ontaining a 50-W resistor, a 10p t9n ow :-ts0w07 s*jvbcqbr9-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 y j9/; nc y-cc)v al34i cojbda7 0c1egb4vj2wa 500-W resistor for a phase angle of a 24jyld g;79cj- 41v owae / nvcyijb0bcc3)c$40^{\circ}$ 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 ;gxw5 h,cm1o7jkr o,h= 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the drivic5 h,, okw;hxmo 17rgjng 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 i(htth,5p( p dhn 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(phh5 t( pdth,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 At) i e8,aqbo(ldyspi.) a-afl1s-so 5C 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 impedance of 60 W and a resistance of 30 xd:)ct o/(wzwv:x: thW. What is th c):twwohz/xx dv::t(e 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 series Rnwjx2;2iazxh k 0x7;m LC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a ikxxh;m2jw0 zn2;x7a60-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 seriesryih dfu5 6,j.?5.jdiy fhu6,r

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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 bat8xle //t2r+y 2wjbin series with a 4.7-mF capacitor for a resonant frequency o+bjx ta2wl 82/re/bytf 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 seric4*5 vt8wg6kcc (f,qsmf;erfes with a 3.7-mH inductor for a resonant frequency of c 5kfvf (srwgqf;cct4e,6 m8*1000 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 be5: 4kodyv/b7n(hm kn sxp:1pn placed in series with a 30-W resistor and a 40-mH coil if tnp vk(hkxdbn: p4/1om s7n:y5he resonant frequency of the circuit is to be 1000 Hz?

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