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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 magnetic flux e,s akde o uij no+v2o*ywv6q2-s0(z 8hxcept

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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 states4 ozqy,)crj1tkzahjos* z0xj7s 1 *l. 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 ypxv 9ep5(4el produces what kind of change on the inducedep9l(peyx 4v 5 $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strengt auioohr*+3r,j *gxe :h of the magnetic field through a loop of wire produces what kind of cha :rr,u3+oh j ia**eoxgnge 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 ofc i-q9 a/opxq/ a loop of wire produces what kind of change on the induced ip /oaq9c-q/ x$emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field veih* qj3um5u8ep5 +zan $emf$ 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 8g *8nm 0bgrs;xz7s8 y7xigi p;xic-ujx+i /alaw, the direction of an induced current in a conductor will be that which tends to produce wxmsc 7+*x8r87axsgig8 nubz; 0/ yi xi;igj-phich 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 hori9-7 z rwao6xomb 14mrtzontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet indu7-64ro1oa mx9tb zmwr ces (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 he*j ul -7uoyi) p xowr09is (2avi-o5veld above its center with its north pole p*vpxyiiow59 -0as( e-o ljru2uio )7vointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a juu :4de)x: jmlw. n4uregion where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fadednju umuj 4)l:: e4xw.s?

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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 c w oo1j9e56wia region where the magnetic field vecto15 6eow cjwio9r points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the 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 r j cw.018omwyw,k,cas egion where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from abos, wcw0ow1kjy.8am, cve, 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 ml/tx ja-2fs-ro: *w(ttjm 2jhorizontal table and 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, the induct r/-wjmx2f(o:j a-l jsm tt*2ed current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the nort ynp nbft;fk sim622i-a (lk..h pole entering first. As the north pole enters the wirk.fmn pyn62a; il (s.bftk2i -e, 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 an axis whq ,v )n7io /r7/kv4v6hs kpevmose 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 i6v,)pik 4 /qeovhn7rm/v k7vsf 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 ange7k;m p9d we/cular speed about an axis whose direction can be varied. In a region where/pw k7 mcede;9 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.i8* .pv mgrmy *2rvjb.
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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 4 t16xla6i arl$emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. Theyzw (uyqz2*zy 543 yrt $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northwut )zv ih7.cvcwf:0 y5ard at constant vel )tw iv.75c:vf0yc zhuocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular velocizv q 26wskb) xj0ii.0h:7g cgmty $\omega$ 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 to / b9xx2a.oowransforms

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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 revolutionn k y +):or)io.3md-9rw *k duhabgi4zs each second. The frequency of the +um drg- riad )*oy.knhzi4 )wo9b3: k$emf$ 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 tsql/44m blso 0zlle( +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 devtq;a2),+kk7eb ep w gwice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loo d9ndvj/ 4col2ps than the primary coil then it /4ljd oncd2v9is 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 4j nrx6txv:;sb.hs1 lc15esq than the secondary coil ;jt e56sh v4bxn:rs.1sl1c qxthen 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 power inpuzi98deh na57e 3ax :yut

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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 cr nx4 (c3p1d9cbx:h(u9ter5 zaa l3pg ircuit,

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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 of co7jf)lx 7o+m4s1o up3n po7,r;f di iywnstant terminal voltage. At the moment contact is made with the battery, thy3ou+o1i ;ijdx o,7slw4 )f fprm7n7pe 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 inductorbycm;3q:-l v um .or)w are connected in series to an ideal battery of constant terminal voltage. At theow)-cbv. l r;u3:qmym moment 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 inductan*dkl2mzc 2 +1a:xkkc*lf z pre j-0lc8ce L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected tpjtuge1z . ci)x m ru6f(:my9 t1,ueq)o 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 inx/nanh*y1y 2n,fz4 iko.ke9hs 0/lni ductor are connected in series to a battery. The time constnn nsx,0kil/ah21e nyz .kh*o/4 fy i9ant 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 connected in series to ao;r:-bw redwzj 69uau ic:;; h battery. The battery is suddenly removed fro6w o9d; zujb e-r :;ihuac;:wrm 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 the same unit4g 9+.awehhr i9y:z:v(rnb ow s 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 s/3,f yfyzdg(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 an AC power supply. It1-bto kdh3-/guy0dp n this circuit, the curren-/k -pg o 3hddyt1utb0t

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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 cuu-mr hai0) ( r+mlv8kircuit changes by what factor when the frequency isil8u(a)+ur rm0vm -h k 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 across an indukd ia2he.: .wgctor is doubled, the inductive reactance of that inductor:dg hkiw2. a.e

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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 inductor approaches zero, the i sv6pp-c r+7arnductive reactance of thatprp asc6-7+ rv 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 c :d7c+wvc xcn9ircuit, the currecvnd9 w+7c:x cnt

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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 changyglmf6;v g*+ xes by what factor when the frequenglm xvyf6*;g+ cy 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 approaches zero, the ca vbm(/k0jzx toh;p 1eynk5g*d8 awp4.pacitive red;gzkj5n(1/k 4h mo t8.x 0a y*wppebvactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor 5ymz8pt:jn j )vd+(rmand capacitor in a p mt)mjr nj:8( vz5d+yRLC series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLCl zdqgsd5qin9( xz(8xcv23 r4 circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The :sbl1id1zvg x .dig(b ,w( 8waimpedance of the circuit increases if R increases. Wheni(1x8 b gabi z(: vd1g,.dwwsl is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuivr(y 2*nxvs , ib-4waiisw f10t 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 impen8v6llw-fy3w*drn 1h- vw5c n dance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuit, thev-s6rg2 u* en3 5q*7 jnpt7niujlvs0z resonant frequency of that cir qvun2 7*s07 v-z*ntjpn6jrl 3usg5eicuit 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 iswbrdo:)-8p 9) cmy 4sya8t2 i nj gte(s)n:dxv 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 ciruc u/fy0( b yridzlk1 7wu0.;mcuit 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 voa.8 f+q( v5q(c k gil*(lwio0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop wheng .olqvf+( cw lo5 i8iqa(*v(k the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m isc:xl 4z3r.v f0blpi dblh,f62guk-, b 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 vector are perpendicular.fld. :rb hpxv lb6-fl3guz,4k, 0cib2

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform m ahmlu,/*d s,aagnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop al/ sma*dauh,,nd 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 anl9v 9gd/wl/qgyzf) m . 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 klld 94ehm95w3fzp3(2od (f u; txunechanges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cmtp ,vw8; pzqlz69 zy.a. A uniform magnetic field is applie,ylvt9 8pw; .zqzzpa6d 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 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 wyv7 rh. z s43ah4md0raith 15 turns 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 anw8rdu+wrso 5(k 2lw:8u ) tbq.byh6fnd area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location where t0h c. h/vm 7y6e.luumn8uoqg-he downward component of the Earth's magn.8u-e7 q6v nmh/0oculgm y.huetic 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 ,8+sfjgr;)hfe, 9yynwb +d sk long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through odjy) 8g kbhfn,ry+ sw9e; ,+fsne 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-3qes oxn)pj3;sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns op *9bg3ufyxe3 ;k;betf 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 re ,/7 wezklx a0+ttcp-y 5 4nkago9e2rn:sx,mbctangular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltxp 2t4 9gknotba + 5/,,ymcze7k0nrae-lx:wsage 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 76pqc s9e ebk0100 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 12ayvd;1eax5c i ;,im0h81e7rg ew .eol V maximum when rotated at 60 Hz. A magnetim lego 15e7 ,ae y8hari1w.ev; 0c;xdic 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 maxi6xcn7nb ,: dismum $emf$ 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 8 u.n,yzhqrdwsj 1+ p*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 have a resistance of 6.00 W. The motor operates o8ky nxil*y1. :mz)n len 120 V AC, and when running at full speey8*1 nn m ikelyz:.xl)d 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 to a 24-V power supply. Tgp5+)k qv rwq*he operating current is 1.0 A. kp*5q qvwgr+) 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 supply. r qf z +e-d g8eiqlm15oi l/;5pv2otz1 The operating current is 1.0 A at full speed. Wha8ipo-z1d tl2/g vrf;q+5 1leioq zm e5t 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 resistauzs94wpj p 7sv-w)vz7yqe)i : nce 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is thesu7 s) vw :zp9ypqiv)j-7w4ez 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 aq6h0yq*z:bt0tv q;k jdmg3.qe iv; n 1 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 onac6 kmp h +gc079dd)df a transformer causes 14 A to flow in the secondary. How many turns are in the secondarypm 6ca7dkdh9c0+nd)g ?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if ther: 8 +hidmfz*imdm k; 2t84zjo 24-V secm 2 rkthmdmf:+*oidiz48jz ;8ondary 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 coily z2p,f0 hqq5hhs6:y ,x (ifaa and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current inaf(q02iy a:6 hhyf x,,zp5 qsh 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 trtze38e w (i n10yaa2gtansformer. Assuming 100% efficiency, how ma0e3t2gta8 ezywia ( 1nny amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer p,mbjyemxs,x.d, 0i/krovides 7500 V at 10.0 mA. The primary coil op, ,i. x k0y/xmsbed,jmerates 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 primary1 5gi9nwb+2aeqis i3r coil and 300 turns on its secondary coil. If 120 V at 25ni+wbq1ra 3 2 igis9e.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 30+szu/cmxlpg:9a* vt, .m0 bu k0 turns on its secondary coil. If 120 V at 2.0 A is applied to the priz9 v, .:tusg cubax+*pm km/l0mary, 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)zs5-t tj51 y vreec.g.wa :lx 200 turns. If the input current :)vlc5w.. zxg r-1 ja 5syeettat the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has pgc m7uxbfnkr. + 0 20+6fyyzw200 turns. If the input voltage to the primary is 100 V, we can expect the output b+ x m7rkf+20n60zygwfyp cu.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 secondary h5 bra+i2whd4ras 200 turns. If the power input to the primary is 100 W, we can expect the power output of tdh iwa2r 5rb4+he 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 e:(n3w k2fn9w mjrmdc(.zth 6h 7qwp2 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line dcn r72q93kzmhh2:w ef6pm (wt(nw.j of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of jzl df *gy/9kxf. tg,3current at 120 V. The voltage is usually stepped up to 4500 V by a *fz3dk j txy.9lf,g/gtransformer and transmitted through 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 120 V. The voltage (vy1- aoxfcxe+gvri+kyw-/ 8is usually stepped up to 4500 V by a transformer and transmitafc( 8-ye 1i/ owvvg+ -kyxr+xted 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 lvq eyrh,w( /v6ong 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 of the original energy would be lost if the tr, rwhqev (y/v6ansformer 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 of 0.wwf/d.4v)cu7q9uw p,f abb 2hu u6d 5s60 W. A generator produces 100 V atsd6u u4/hwbu a wb .2dwf),f5cquv7 9p 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 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 pojg8 k) l-wj, .p63p8 oijbuxmtwer would be lost if the power were transmitt3xbu.-k)6j m ,jj ioppgtw8l 8ed at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator isdn zv2b +lmym:5n59ig3 iju 9jogu9 ;x 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to e5xu53bz j;9 jgl+nmv mn9:ig9d2uoyixceed 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 5zlva)b xrzfgz ;6u1-/c md o7of 5.0 A. How much energy is stored in the coil's magn d5lrc 6z1mzu;/xf7v)b az -ogetic 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. What is th(v5m2ka.m 8 m3mwtg01 hxvxguis circuit hg(a5vvumkmm0.8xt2w13x g m 's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit wher2zs.o0 hzgpyaxe- ,- 7p(vrehe 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. W6yyh( vf vhf12(7f; msilwax4hat is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of the l/y3rxny33 au k8kkc t;axk/3 ky;3ut3c ny ak8rmp?

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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 connectek5j*hem u6d n+d to a 120-V ac power supply. What is the peak current through the resistor? n6u5km+e* djh

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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 swfql3sh 2(aady 5ey0-l/e d7dissipated in the re7yyl 2 fwa3eh 0a5qsled(s-/dsistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through am wdp 5op3-crmq/m34q*ua 0vnb iuf2* 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 ai;oj6u *g e-dx1 bormb+8y-u h 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resisto/ y: 2jiplmjm-r 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 ma; c/m5/xx)q0o bglka 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH q;pcd*)qbr 9y coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.hrfa18z: f7 ck0-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 4bxjc 27tprt, for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a freque23g(z bz4 t wpk2babo1fdn7z2 ncy of 20 kHz is appliezwb 1z 2(2ptbg d4n32zboka7fd 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 qc:4mp 6x+ ;seoyzjm 9due 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 lg+vge:,:h pnx50co k4.7-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 h u2yfn05t-0yg .ov: x;mg xmtiave 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 1200 W87fisjidp p2ya) pf+fg ) )uie i8g(8y?

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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 qcc rzp vo5lp5jl*mzv(n2c;*+f/ .apWpcl+/*z n vmcc2zppvq; *5(.rjof a5l?

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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 0.00haq+15p7te 1l p3kupr 10-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 sejo5b n; qxiyo -o8csg/.;)qxmries circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capac;o qy xj8;qonm-.o /)5i sxcgbitive 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 impedancho a2qnlm ii5orbhy8b 0(rm9o..j*m4e at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capnarmqo(ij h*8mribl29m 0h..yo 5ob 4acitor 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 1+pzjp p;762sj ukmg,;sruanat 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriesa+; pz21 urg7 p,jsp; nuskj6m?

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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 isgcvr1n0ttw , 7 the impev7 w1tctr, g0ndance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connec rxh; 40v0bhpvn8qh9lted in series with a 20-mH inductor, what is the phase angle a xv0nbr8h;9l h04hpvqt 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 witn1 0eu:guo.tm h a 20-mH coil and 1.0-mF capacitor for a tg utn u1eo:m.0otal 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 fbhsi iu5a4/:6xr9bjis needed in series with a 100-W resistor and 15-mH coil to :xfi/sb4 jri9aub5 h 6get 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 seriesd5d s*.gyx1d-kj i9o c with a 450-mH inductor at 5000 Hz for a total impedance og5yo9id.*j1dxs-c kd f 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 wik802z 3gk fjc m9i.xheth a 100-kW resistor at 1.0-MHz for a totalj0x3g k.ic mf k98zeh2 impedance 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 is the im1 hfdzmqul+2u 9lmrdh/:,;rl pedance at;zm+hh1m:fqu/r, dl u92dr ll 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 ser/hk 4j)qoen.j ies with a 10-mF capacitor at 1.0 kHz for a total impedance of 45 o/jej .qhk4) nW?

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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 *b /tdbews4 rm mj)7c0with a 10-mF capacitor at 1.0 kHz for a phas rm4bd)me *cs7wjt/ 0be angle 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 se +d qgu4/4wxoeries with a 30-W resistor at 1.0 kHz for a total 44xdeu/wq+g o impedance 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 br.nc7r 6sgi0at 120 Hz. What is the phase angle?bis 7. c06gnrr

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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 resi.4kp .b-ichf dsda12sstor, 20-mH coil, and 1.0-mF capacic sdi .dh-fbk4.2a ps1tor 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 ( +iv7u 6cv (nomo:khev ; )quk2z5piaconsists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The cozu(e;v:u +5p 2m7 hvik6n k(o)qa vciircuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor6obcx:pxd m:+; ojpyqvg3 8-d of capacitive reactance 30 W, and an inductor of inductive c68dx yo:bg3;p pqvx-mjdo+:reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLsa 3,ai:esu3bva ni; k9v4f7vC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H induavn:evk3s7i ,i3v b;fs49a uactor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phob:m; ug3,+ atzs1hu4tlxx* c ase angle o om;ht3u ba4z+s gutx: ,*cx1lf $40^{\circ}$ 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. 7 6m d6hb4ekqe (/ cmcqrl8ie3 At what frequency should the circuit be driven in order to have maximum power transferred from the driving kb8hq7 m(ce r4 /c6ei3m qe6ldsource?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 1 kd8 3 kz31,fwbzyty8h5.0 W inductive reactance, and 10.0 W capacitive reactanceytbw3h 3d ,fzz8k1 8ky, 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 cir*o3 0qandmmzy,+* nu:jnpe) mcuit 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 W. Whatwh2memc; axy2 om+, q4j dlzrt +7-r+y is the power factor?ta2 +r y + hje-l2mc,dqxrzmow7+4 my;

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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 resistoq ihj38af+s yhwh*,d3r, a 10-mF capacitor, and a 0.43h s+3jhywq 8 *,dhaif5-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1+7jy3p rpmq w8.0-mF capacitor and a 15-mH coil in series? jp87w3y+pm qr

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is ncfp(0rxjlgx 2tq3 -)(s6a cuyeeded in series with a 4.7-mF capacitor for a resonant frequencf0y -pxl)u6c3rt2( (gxasq jcy of 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 series with a 3.7-mH induw-ie dkdu(z, ugymc6wg8 g61/ctor for a resonant frequency of 1000 -we/( w,dkg c61 yg6iuguzd8 mHz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series rua7kmu3b* q f.r 4z)nysf* g7with a 30-W resistor and a 40-mH coil nsabfr747zu)3ky **m fqgu .rif the resonant frequency of the circuit is to be 1000 Hz?

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