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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magneyy3 ;wc8cm yk9+*lurp tic 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 statvyf a -lx0.o+2hq*fyyes 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 prod lfyqb( e /9(1buew4touces what kind of change on the inof4lub1yeqb ( (/ 9tewduced $emf$, 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 tigvbt di /uz0+ *t1s-a loop of wire produces what kind of csb1 gi0 / +vit*dztt-uhange 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 sz0a ya1mcx 1o(2/fo-cta g7x kind of change on the induced 1f2ga z(om0s x-xc7/taa c1yo$emf$, 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 f4 x6 6v/-pvoi- xkcplk pn3ok;rom 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 currx.: *4ta ysnxynojpaa3l93 a5 ent in a conductor will be that n 3loy4xts *5 ax.y 9a:a3apnjwhich tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat *gnk/4; ljybdy.8hjf /vs3cz on a horizontal table. A bar magnet is held above its cebv /sn/k3l yjh .cjz;f4dgy* 8nter 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 po5vhril3i9j3u1 n4 k magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnlo9p415vk ru ij3n3h iet 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 regione1o 1cemr7s/)cgbife 4/ a lu4 where the magnetic field vector points stra7egc )a our sme 4l1/fi1c/4ebight up. The magnetic field vanishes 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 where the magnetic fiev e)2,mh qg0hhw jd9s( gv)y1zld vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced c 1hg2dj)h9sw,(q )hgvmv 0yz eurrent 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 rel2bgrtqdb vplg720d; / il,j3gion where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced currvd l;2bgl2i t 7j3q,g/d r0blpent 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 anq34iaj+cy c ,0 cslf4ed carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above,lq0 c j4ec+ai 4fc3s,y 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 brw:j5l;;k lrthe north pole entering first. As the north pole enters the rl b 5;jkwl;r:wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about.; jdc5( zui 3(dnhtdd an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must;dddd.z(hin35(j cut be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed abot1a dg.my3 rxyr809ap.zrqd * ut an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what musq.8rytaxp d zdamg0r3*91.y rt 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.;r6 u/d)l j kep a;e7+my 8oozgg9dz bt*3zke4
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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 thvy(2m jfw mz84;kl / (s8xkujwat 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 mv w;3v o6ey3 eug,z1xragnetic 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 thead0h1j peogx* 6pz. 6*gi.ngr east-west direction) is moved northward at constant velocity through a magnetic field that points straight doei. gn. aopzpd610hg6 xr* gj*wn. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar r usw/p ik,b;s18 /taxkotates 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 trspn 0zc i.2oj+fdne(,ansforms

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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.tp ym 2rxb5ke/3 5u*sidzu6k second. The frequency of thdy*it/z3 bk p5e5xus mr.6k2ue $emf$ 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 deoy7zx hf- 6lz:jmq;6vvice 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 device tgh-tywhw1a0sg ( z4z/hat

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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 loops than tmqr8.j*cu t y5he primary coil then itjc*m tu.qr5 y8 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 coil contains more loops than the secondarb j)szi* *j)eset6x ;lsop+s)y coil then i) e t*);iz)so *pjbssejl6sx +t 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 (5p -c* lpoa(vxo( bknpower 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 cir svtk b83lt6)9 jx8emocuit,

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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 ideal battery ofknj/)+ej;rsj constant terminaj)s+n ejr/;kjl voltage. At the moment contact is made with 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 are connected in seriz /esml63oy g.es to an ideal battery of constant terminal voltage. At the momenzs e.y/o l3mg6t 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 L and resistance R is co akt/ixuwgk-s+ 738wnnnected 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 remh;, n qjvq-7ysistance 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 inductot )1+5h-z6 r)sftouxwi dcd y(r are connected in series to a battery. The time constant f))fh o+t ud5riy1 sztd6c-w x(or the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The battery y*cxbc 0 ti2l z35c)8z( rdjzpis suddenly removed from (z)8y3jic0 2zbtc*d5zr pxlc the 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 have th*/ hc2 +aq3ap a4eowanim1x8c e 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 powo(5 p1tyy-4 prqy,nj7 )pjujeer 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 conne2/ umqk8zoyldf1bk 2l+7oq 9g cted to an AC power supply. In this circuit, the curreng qo k1f kq /oyu+z2dml87bl92t

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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 when the e4 aa:(kse* sjfrequen*e(ek4a ssj: acy 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 acrop72 nw.ayj4 anss an inductor is doubled, the inductive . n a47way2jnpreactance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC vol* hehu6rlyy (t-az m-ax z9h8*tage across an inductor approaches zero, the inductivea z-tz*mh h*69-8hlyu(xyar e 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.lf p8f586vz d)dd1ee n.5pto p In this circuit, the curre p tpp evz5)d56fde18n 8ldfo.nt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factggrlq:too 0ze6 z2u:n tr4evl q**,r) or when the frequency is triprtgtg0 vnqze: ezru: rol* *46,2lq)oled?

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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 ACofn5;w j)y( fkzke02x voltage across a capacitor approaches zero, the capacitive reactance of that capoj ;w)kk0fenxyz(5 f2 acitor

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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 cge zjzr0h*482j crhp)apacitor in a RLC series rjpr e2)zhc8g4j 0zh*circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined z:zs +c3 :7bji)shioe 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 circuin3s c-zf4 k1r1zcpk+gt. The impedance of the circuit increases if R increases. When is this stakkzf+c 4z-crpsn113g tement 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 circuit88viusj ei63( 5njthg 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 if::5labg t5 czf $X_C$ 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 th 3tl vt9x(,e7j+s67*ugynjyswny c0a88eid i e capacitance both double in an LRC series circuit, the resonant freqde8jusxjael+ i* 6 7(0 ,gntsvt78y3i wyy9ncuency 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 circuk yam+ xybi6:/it that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occuv irk.pk ..hov)9upcapv81 z -rs 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 uniform magnetic fielnmt2t/ie j- 5 h/,b 8xmpg0tukd of 0.20 T. Find the magnetic flux through the loop when the plapk 5-m2 giut/nhb j8tetm/,0 xne of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in h4jsv/i: y(xyvk5t z(8z :fesa uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vect kevxyyit4: s(f (:8shz5vz/ jor 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 r4:0dsd5ky8g s bkwc q q)r.flw+)uyq7adius 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 t cqukdy)q0bfk y8wsw7q)g s+r. l5d:4 he 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 singl 8wvk)*sli7f6t prwg/e 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 changj).d7wjfok :l es 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 sq:,a.wuhy +d pyuare 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, find the average value ow:dh.uap y y+,f 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 areh(iuy ouxjuno4 ;5q vyz18- u(a 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 a/g/w qn76q.l o6zpm threa $0.20 \; m^{2}$ 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 horizbursb)t (mcbpwt1kv dw ; vd 3:z5b.6 p0c/y*bontally at a location where the down(ud ;5v .:db)sw bbr p6 btwccz1mb/0v*pk3y tward 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 ma7k6v*nzo g2 d3cq v0f long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis througoa6vgf0cvnk*q37z d 2h 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-solk;qp5m:4d5lblq )ptm / :vvectional 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 turn.h-*uis t4bzwc / /xzfs 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 vfjhj -p ptn /67gf4;oloops 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 fiel-pf67; ghv 4/jftp nojd of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire o6t p; zce*sjn4f 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 gene6dy4gyfnnt 0 )rator with an output of 12 V maxif g4y )dy06ntnmum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a myc+t3scz 7 9qxaximum $emf$ 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.j6a4:svs (;g s mrzjs motor have a resistance 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 ho, ;2ilyz 5 qiu.,p59 -1n hvotxbayphave a resistance of 6.00 W. The motor operates on 120 V AC,o-zq 2 ot,1,nhipv95 .hyxub iyap 5;l and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected ** yah2rwox6o.ef3ns to a 24-V power supply. The operating currenwyo2e*xf3ao nh6 s.r* t 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 resistanlc-rm)i*;r8lte j3 x oce 6.0 W is connected to a 24-V power supply. The operating curren;rl-cmi)jrxo8e3l * t t 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 connectedy2zo,s n0k q0u to a 24-V power supply. Th sou,k0qzn2y 0e operating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a prhhgd7 *. x-z5miumzu0imary 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-turn7e).v fuzf6fd ac,c7a primary of a transformer causes 14 A to flow in the secondary. How many turns are in the7df.f 76cceaa zfu,)v 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 11 f-ep 2pw*h.2l)i aeud4t 1wdvtajoz 11jz 9i30-V primary if the 24-V secondary has 100 tur.o 1 zpw9 lij4ehv-* f a3p2jtte)1uazi12dwdns?

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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 2000b*e7d f1k cmb)wlas1d0 4 d,hf-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in sdahd)mf w, 1 fk7d0bbel14*cthe 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 o,qpq 3snr-0f*:k ffi)s 4wotof a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in ther s0fqi3 pt 4fnkw)s*-,ooq:f 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 mA.yt x1vwht16g6y 4g7 e;g oql3l The primarlyg w;oh xvgt6 q3lgte41167yy 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 its primary coil and 300 turns on it zwr*w u. i8i+aa0 2zzt 95bqdxmmkt.sc1 8wt(s secondary coil. If 12z c.bq *t atz12wux+mi8wzai0k95s(t w m8.rd0 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 300 tuady erz.ez5)js7m0 +irns on its secondary coil. a5isyz+ ezdm) e.70rj If 120 V at 2.0 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 0skdgq 3zpnn,x5: m wpor)* h6100 turns and its secondary has 200 turns. If the input mhoz3rg*q6p 0n kpd xw5 ns:),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 itsf.lk7x3 b /vri secondary has 200 turns. If the input voltage to the primxf /kbi3.rl7v ary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 108bwie4-s7tl ux1; l/y2n ginm0 turns and its secondary has 200 turns. If the power input to the primary is 100 We b81wgi;tiunx 7 2sl4ly/nm- , 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 V. Th6ny gsl6l9i9o e 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 seco9l96 6i slgnyondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is 16 wg9dvvzr o+usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage rgw96v v1do+z 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. o.39wv rhvpr1 The voltage is usually stepped up to 4500 V bpr v9.1r 3hovwy a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.6020z1eys ia19 th;ahqq 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 100:1. What percentage of the original energy would be lost if the h1z9 ;1 qtashi2yq0e atransformer 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 longld, k6cmg) lqn9 c c: :oc.i1rf6fsz.z 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 100:1. What percentage o6f.zq,c:c :ro l gnfc61mdi. lk) szc9f 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 less power would b) h ;5,uzytoy7shczo0 e lost if the power were transmitted at 3000 V inso57h zyh,);yz0tscuo tead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be tranv zxs.(n5 sn:f5r+bixsmitted on a line with resiss iz.nxnv+:fs5r(b 5 xtance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is storaoyilj7js df 843- v9xed in the coil's magnetic 9 ijj-4 ox783 dlysavffield?

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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 containgxbxxv3kwtdr1s8 o k,-3 *03)wrnegns a 6.0-W resistor and an 18-H inductor. What is this circuit's time constantxw wrd brx-g,se30ntnx * gkk o83v31)?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage bahx 8+mk m7)jv1icv6is 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. What is the peak curren4wqk3p9 .v v:. uj:zzso ;psnbt?

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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 120-4t etijz25rc; V AC outlet. What is the resistance of the lamtc25r ;z4t ejip?

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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 d;gs;yi f( w6opower supply. What is the peak current throuwf;ogyid ;( s6gh 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 is the power dissj,/dnm c8 l0ipp/ j0vaipatedm0d // lvpnai cj,jp80 in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W e:b3 -uik pkwe+v2ided./uo x5/-p had9w:q c 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 resisto tdg9vg*pf7 m7r 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 resis1+c6qsb )f qgxtor 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 x/91kwilwlb6of a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactx pna,mgbhd1 /4/ +xrgance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 1(xj,r(mhy sa 34.0-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 reactance at 1000q17 (2mtp v8 qptqe8sb Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 kHz zmcpo l(q- q;km)- j8bis applied tom opj;)8q--l mz ck(qb 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 )yxgj0offh8* bs( aj c.p5v v)to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor2 eyv.z8d237zey b ms3qd6gyc 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 /h54/i8.ku jh ckkotmhave 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 s/fh* 2cv nrp19p1is5utig u41200 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 capac*t(+qq: 4e ognbxz6yaitive reactance of a 0.010-mF capacitor be 100 Wga*t 46q (y+nbeo :qxz?

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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 -cr ;1diw(n- m r jag85t+wniythrough a 0.0010-mF capacitor 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 12.0 W resistany soovy 8okvo-z,g ,7x :6+ofece, 15.0 W inductive reactance, andogoy+7vozs-k8e x, o6o:f,vy 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 imp ,yod;t,ho;fw edance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF cd; ofhto,; w,yapacitor 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 1500 Hz ifr hzp1:t;zfj+9f k p2m a 100-W resistor, 20-mH coil, and 1.0-mF capacitor a;: hf jfm+rkt2 zppz19re connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is1)o - ubx9sag fvl4d.bn vs:n/ the impedance at 100ud1/lf9nvgxnb-s s :4 b).oav0 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductorr w915 2d3iaum .uuxkx, what is the phase an k9x25wu3 ur1m.iua xdgle 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 circuit with a 20-mH coil and 1.0fs3t (zzglxpa-4-4t v-mF capacitor for a total imzx4(vat4 zt-p3f l s-gpedance 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 with a 100 r:w2y0b50kna 4cqre u-W resistor an 40n5 2beauyrc:kq0r wd 15-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 inductor at 5000 Hz for a tkh , nd++nvn1gotal impedancedknvnn +g1h+, of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kWt1(o 7r5ryqeo resistor at 1.0-MHz for a total impedance of y 17o re(orqt5150 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 connectedwd qi76,f(ir ii/;,ss stuu9u in series with a 20-mF capacitor. What is the impedance at qr ,,iuwfsi(6 u / sd9itsiu7;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 serie 156zzy/tk3h 1bwfns + ggvvy+s with a 10-mF capacitor at 1.0 kHz for a total z 6k1+z+ty1wf3 gv gsv5nhby/impedance 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 1.0 kHz for ao7phwi m;t**vzahh4(e 7k ou - phase angle o ek*7h-;htizmwuh ( apv4*o7of $40^{\circ}$?

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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 for .zze ;590kfjqx 5mz,hn0.hz wxg z5vga total imped z n0q,z;gexzm9k.xwzjf 0.55z vh5ghance 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 ) gk r53q:mu0g u-yla:amow:d 100-mF capacitor at 120 Hz. What is the phaseu5 w3 :y:dlg gu-oaak:0m )qmr 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-W resistor, 20-mH co 0c-+zk (vf/ejlz h9slil, and 1.0+z 0h l(c9fjev- szkl/-mF capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit0)orxg4 ny:5 fkp1pgjv n dr32 consists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current drn0k:n rfx15p o gvjy3 p)4g2in 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 reactanc v;k qzk11w cg-6y1flq;7swvw e 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flowsfqv1v-k 1 s;cywz1 7;qg6kwwl 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 3jl;iei/ p(d+t;jcj(: u way oa series RLC circuit containing a 50-W resistor, a 10-mF capa dj 3icajl+p ((iejoy: t;w/u;citor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor fq0/)b* 5tdqfl rt; qwwor a phase angle ofrtdwt;b f5 wq/ql*q0) $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what fr2vss5g kd f sha1y7;00d9l86lpna(ho+a ihvuequency should the circuit be driven in order tolg +ydh1ap9ka05h l a hdv078vun(so s;fs2i6 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 se ri0g+q -t;qzto;-oxnries circuit with 12.0 W resistance, 15.0 W inductive rizt-0 ;go;-o qqxt+n reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC cio on26u;h z)yercuit 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 -+ns5 5 rsz3sni(7i bhryvar(30 W. What is the poa5irvnys5( r+bzr7sh -3s (in wer 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 RLC circuit containing a 50-W re.9sb s;f .9rc)loyfqp sistor, a 10-mF capacitor, and a 0.45-H inductor, when colq prb.s9 ;ofsfy)c.9 nnected 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 resonanta 8vjusp du7vc:3j 19i frequency of a 1.0-mF capacitor and a 15-mH coil in series?sci 3 ujj8u197va:vpd

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resonant fl-t7s uxs:d3/ i (uzaxrequency of 10a x-sd ui37/(tzxlsu: 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 ipl-d5vc(9bic k /)3na v-qi zo3l grd+n series with a 3.7-mH inductor for a resonant frequency ofr-3a- /)bil 5n3op czcd(d+gk9vvliq 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 be placed in s9 eajv/01idi 4iof w5- gtgudyf6g,e3eries with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is tog fvtuioaiw,4 /ie5f 0y9e-d3g1j d 6g be 1000 Hz?

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