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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 excep )2gb uw8sybe3t

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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 that t xyldhhr2.+/r 1+ooju7ko 7vt he $emf$ 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 wird1s 1*o4sfa5qg:ki mue in a coil produces what kind of change on the gd m *fa4q11uoss5:ki induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wireen j5o+ks , z29qhlsj5g*c5 t(b.dho p: :xlly produces what kind of change on theg l:2ykdjn( zh*5 ebjh sxlc,t:s 5o.5p9loq+ 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 b fgy)q28kv a2of a loop of wire produces what kind of change on the induce) gkfyv 8a2b2qd $emf$, 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 -pj9myay6 s6ebk b-f0from a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current hu.d ;b:zt)wef7,evezo4q 0 win a conductor will be that which tends to produce whibw dt:z uv,e7e0qfzw;)e o4h.ch 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 :+:eewikc/to52 t,u0wioyr dhorizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet io+ kt /2 oi,:wtyce:iwde5r u0nduces (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 heldq43ns 9ezwj am.rfl qnp94 +f/ above its center with its north pole pointing down, and re4fr4+qn/p s.39l f9 njmzq aweleased. 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 region where t -pjitrj 5mf2+he 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 f i -+rmpj25jftades?

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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 fieldc9i-hl52ek dr/ pyjp 7 vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in keh j pc7/l irp5yd-92this 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 magnef( qhy9vt q: ;zjjdh0).1jnqexp* tn 3tic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced cur1he zxn t( fd3q*v9); j:pyh0 .tqqjnjrent 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 carrioyx 1e;porutbgq /(55y3+ plles 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 induc(q1lly+ e5; x/ 5ppguroyotb3ed 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 log yp)v28o9)oxmq q j5q0+kr tyop of wire with the north pole entering first. As the north pole enters the wire,p+r8yq)vg 5o)m j0okxqyqt 92 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 con evguq0z .+q0q r.f:+x,n-*isaa u( o ves;ylzstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic fiel. squ+0ezqqga.+ xv: ay nvoief z ;-lr*s,0(ud 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 rota5aun: ygp9s -wted at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the inducedy aupgw59-s: n $emf$ 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.pe vz-dcc--q t 7z8m8d
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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 t 6c/3wdi2r 2l3ygg;jqrzg n k6hat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. Tffi xk )zwj7/:he $emf$ 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 msskf7y5 pf;rmn n0,w 2oved northward at constant velocity through a magnetic field that points straight down. Make a statement co2f5 kwrn0,n7p;m fss yncerning 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 2eefz u.e4.j5nh vz:lat 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 transfu 2blyl*2.kq, sj*uo forms

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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 revoacd ti 5 9 ti/.5egqifu-6la1olutions each second. The frequency of the -9 ti /adogiit5 .qua c51lfe6$emf$ 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 deqpo +a0zpph 3:vice 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 de 2brb 7)teg/bzmyj r0v26hmqa10i1uyvice 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 secondarys5f-bh2dl 3qy coil contains more loops than the primary coil then it is abfy 5l2 s3h-qd

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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 primarf1xt)(v luz -ilx:g6fy coil contains more loops than the secondary coil thenf-utf z1ixgv: (xl) l6 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 ihj6n+zvid /k8- vg (dhnput

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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 .z,7v3b 9dos )cwxwml circuit,

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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 serie 2yh2vth1)al ps to an ideal battery of constant terminal voltage. At the moment contact is mad 1v) yphlaht22e 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 series to an idvmfrp1qn6 45/ +0(d pxfnrk gpeal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acv p nknd6fp/( mpqxr0f+154 grross 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 connected to anx*4os27n,r1l l vl qiuo5t46mey- kb nxm):zt $emf$. 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 i*f ry9j p0+vngrm n68,ekmal2 s 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 seriemx 3mfd8)kwp*2*o0cc u/ rnurz3 zt7f s to a battery. The time constant fop*c u3)3 rc8t*/fdzw02zo7 kxrfm munr 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 con u 3y*w44ypj5ev.wb7y sn tv*hnected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit repren*7p v3ywuehj* yw4 tysv.4 b5sents 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 w7 sd 0yvn7+r 6ju3wiz)bkws- have the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, t)4g.t2sq px f:3l7xxbr vu,tthe 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 tbq f a -y 1o(;7*jpgove+k8ardo an AC power supply. In this circuit, the current* 8q j+-7 payd;kfeoo1gr(avb

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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 whend,ig (:tl4cwy the frequency is cy, 4wtigd:l( 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 thepn1i2adv4ad4 AC voltage across an inductor is doubled, the inductive reactance of p4nav di12 da4that 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 across an indk qwmlhk o:-)(uctor approaches zero, the inductilhwm kk:(qo)-ve 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 z j9szm-8ci;hb ..gln circuit, the current-jgm;si9b8h.zcn. l z

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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 chan hocpb gdf82dpn50(0cges by what factor when the frequency is tri5( fbpc28 nhd 00cgdpopled?

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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 cif h)jm36d4wq. ;4iftjll n7b *9vuf dapacitive reactancflquld67mn4.);w4fvfhd9*b tij3i j e 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 betog/,(b wk4:f1lz d owk o,xwu:ween the voltages of the inductor and capacitor in a RLC series circ: owul4:w(, 1 bkofoxzgw/ kd,uit?

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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 circk bud,ri0a/jc/)rhbr.: ql c/uit 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 impedance of the circuit in u. 52md9qcec*fk1f mhcreases if R increases. When is t2*hqkcu.59mm1 fc f dehis 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 imp84siy 9;hmli uedance 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. 1hrjv5w+q e/e The 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 serilf zl y5*uz16zes circuit, the resonant frequency oz*f65 y zluzl1f that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit thatb;c . xfq7n+t ay:bt)i 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 occurs whv - (x4.*qwhbqx- lw5ngyidd g2ltc 5f+(mnw1en

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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 fiac 755jgk 5funhu )p.rww+4epeld of 0.20 T. Find the magnetic flux through the loop wh7k5h 5uw.+pwj cnfapr )u5ge4 en 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 is rotating in a uniform magnh f: su3otnbkvnu5itg4 673j:etic field of 0.20 T. Find the magnetic flux through the loop when the plane of the looh3b3 4io67sfktugt 5v::unj np 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 0.10 m is rotating in a uniform magnetd 6r1s-k qao,tah,l de-kxl8 (ic field of 0.20 T. Find the magnetic flux through the loop when the p,h, kxd8t(sr6 ol- l aqdka1e-lane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop3 ju6v;rbc )lx 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 cz2o0 m:-afip 0 4)xg iil9txeyhanges 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 side. koxjy(/gd f*m ip (v8ue5qw)s 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformywuomxj f(* gk)pi/(58 dq ev.ly 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 s otlo )gzi 6qghb;6)pfu;( n+with 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 ahuy7 u:lek b 4 fnq5ua+ywj(6+nd 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 holsa2tjbjjvpd7:+;dqg s 37g 2rizontally at a location where the downward component of thvs32a:jg ddj+b7sjp glq 27t; e 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 p t)f, *-ore0c7ut ejothat is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s abou*ct)7e0tepro-o f j,ut a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-+x56 in 5wge f;y a6dr3eovqj8p)d:ib 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 10hy37qyum l 2)y0 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 z-pumqbk ne0e n:q+:kdevt/+az:)8 r80 rectangular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maxiq-)r +:td+:ne0qep z u nva8zb:/mekk mum 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 w,p r bum35rejxb)y)g 8ire 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 withw p;c0we.dm c.lh.(o f an output of 12 V maximum when rotated at 60 Hz. A magnetic field opwcdh.;.ce.o ( l w0mff 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 w mciv027 d 1kahp( ip:b86mcvi q0ju*uith 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 ktr 7yfch. fh 0eyh;c do/k3,xt 0,8phof 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 ;wj 5gy ipivi2q ()35x7murl5f 1qlsioperates on 120 V AC, and when running at full speed it generates a bf;5liiqi( g 175wxu qpi3s)vly5 rm j2ack $emf$ 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 6.0ocn41 s+/ h.-i oh;:gvr fb)inipa )vy W is connected to a 24-V power supply. The operating current is 1.0 A. What is the stivhi+bc;h /iy nf:41)vp o)oang.s r-art-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. op vz4hma* 5qnw:kj,.The oh5w.kn ja:,o* v4zmq pperating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistarnur-oa(vc + *nce 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at ful+r (or*ncu-av l 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 primao x;7 fjugf60 em/*aqvry 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 of a transformer cau n9,y0j du.rtel, gdnr7v+qy.ses 14 A to flow in the secondary. How many turns are in y, , r.q 7lvrdnnt.d9eujy+g0the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V prim,lr2nder5p.u ur 3c,9ht)ghq/;vz sb ary if the 24-V secondary has 1tb)rh /h3dp5 ,ugn;uqc.9err l s,vz200 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 secondary coq5z )ifx--wq(snl2u z il. If the current in the secondary is 3.0 A, what is the current in xzq (wl2)in -5qu z-sfthe 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 i1 vix:/pvzvq0x6iba k1lr:k,n the primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can,qbk0iiv 6 pzk1:lxvvx/a r1: 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 transformrceg rkl qerg+9llzq21w./173wx al 8 er provides 7500 V at 10.0 mA. The primary coil operates2 ee8/q 1rl1w xcl+w.rg3kq7rlz lag9 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 i/a( fm6l;twtq ts primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in fmta(w;t 6ql/ 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 cau*t/ gy4acig 7bp 3x+oil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the pri /7cytg3ia p*u4 baxg+mary, 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 tran96ky. sd j4)g rmnor86pnn0 yvsformer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at t )rso0nr dg4jmv 9n6y8n.p6kyhe 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 transformepn1 jm+)pf(i:zzx w* er has 100 turns and its secondary has 200 turns. If t exz*fz):+ jim1wppn( he input voltage to the primary 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 100 turns and its secondary has 200 turns. If+-7x 3r;g2r s xvhozkj the power input to the primary is 100 W, we gvz3s-2xhkoj ;rr x+7can 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 ov;d)( dcw4zeof current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the d)o 4dze (vcw;primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current a 0qaoo,f*i.:(sw mgrx7f sm( it 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of to*ow is, mqm(.oarg7 ix0s ff(:tal 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 12n 9dja;ng((; nxv;gzj0 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in n;vzj ; (d (jgnxn9;agthe 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 rq92.jjkkw*fmkf0 j 8 k 6aaz6c1pn,b eesistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmissi*wfq9jf c6.b2kj6ak m80ja,1e k nkz pon line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km olko s9gnk195 ag f3j)long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the trans9a9 ogf1s o)k3 gk5njlmission 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 fe w ng(w6upoeanpf d 7;5;,2zless power would be lost if the power were transmitted at 3edzw(7 ge6 pop,auf; 52fnn; w000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 j8kz(ziy * 2xsV 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 t2z(jsxky8* zi ransformer 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 stored4-dwz)h8y dm g in the coil's magnetic field) yh- mwzdg48d?

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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 i:p ,vzfm7rnjat .s u/9nductor. What is this cir9p :um/ .r7tsavfnjz,cuit'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 ;6v2cdo k2icz e8u .6om lqp,yAC 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. What is the peak currenhw 239 m7eqnbkt?

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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 c i;pnb 24a; nkm*friaa4of4;into a 120-V AC outlet. What is the resistance of the lampf4an;p4rimba i* f ;;n 4ckoa2?

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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 s 85k+u exeu u(p(hsa9fupply. What is the peak current through the9 uehu+(k (a e5fus8xp 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 p5 ug jl0+sj 2pi7zi.doower supply. What is the power dissipated ioz0ijis7pjg + u5. l2dn 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 rei+p p664 6xvxa xlo;muyp+z;psistor 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 5mt ;:s0rpvmp; 0-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 resistor*wv 9ms6;nl( eomp/ya 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 inducto, gdesz-:jphinf(.nv0q v ;t.7ooam*r 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 2.50-89ny +yd3rzwnmH 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 14.0-mH coil have 14.0 W of inductive reac7j5+pfctm pz6 fl,u c8s)s7retance?

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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-thguxr +e -v1os.rv. gzz 38f 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 um.mtw9v((cfg -f-wg t/.jiu 120 V AC at a frequency of 20 kHz is applied tomju.fmc-.t-i f(t ug/w wgv(9 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 to a 110-V, 6y43soj - ig:gl0.0 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 capacitor at ,yt;u1v s g/rf10 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 capacitiv- ng)2ecmw yd9lwwoc,ch r*9:osj,d3e 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 r(kj9n 1vswvp p cls719;n2anreactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be 100 d6ry tj2+plnphe ;;:wW?;6pp 2eht;dwyj+rln:

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 2yw hkbs) +b,m1000 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 re1arw sl1 bq-m:sistance, 15.0 W inductive reactance, and 10.0 W capacitiql- :1r 1msabwve 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 residx si+i )e*6j szrcb,7stor, 20-mH coil, and 1.0-mF capacitor are connected in seriess+ 7 e6j*d zsb)icrx,i?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resis0zs: bt d*r*aytor, 20-mH coil, and 1.0-mF capacitor are connected in* yz0sa:td br* 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 witl h5qduu/;qu8h a 20-mH inductor, what is the i/u; 8dlhuq5q umpedance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is the.2(k:pr r3nn0 fkklni phase angle at 1000n(3rn 2nk0k .r:pflki 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 circui.ysz ,*n:fvu vt with a 20-mH coil and 1.0-mF capacitor for a total impedance of 10y ,vs*z f.:vnu0 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-W resim .jkppjsj ;/-stor and 15-mH coil to get a total impedance of 110 W at 2000 Hz?.s kj jm-pp/j;

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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 50h. eb,wugrn::e nhhq +w6t04 qxka (u;00 Hz for a total impedance of 400 0:.:qnak 4w6;rehqx tghn+u,h(u ebw00 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 witsl+wi(ms wffl5.u )8b h a 100-kW resistor at 1.0-MHz for a total(ib)w.5 +s llswfu8fm 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.hplxg/ug.6 -o wok7 h1 What is the impedance at-hgoph7xlg . 6o1u/kw 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitorl:y n39th )oizqr;r):3 xsi zg at 1.0 kHz for a total impedancht): rs:9gol i3qz3)x zn;yrie 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 is8, y -vn6m-miz 07bf2 lzoph10-mF capacitor at 1.0 kHz for a phase angle pi0 m- y,-b8i6m z sh27voflznof $40^{\circ}$?

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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 kHz4*pff2n(og ofjoq xs.z0,ac ey+.qg 1 for a total impedgf.qo,xo2f *a onj+cpzy g fs14qe.(0ance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hze6(jdg 3 (rhwb. What is the phase an( bj r3hgw(d6egle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.)n :c9xr79zo espa, jt0-mF capacitor are conntr:eap 9ns,)c79j zx oected 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 resistq6:.t r0cxttzp vi;l7or, 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 cl:p6 0 qiz7;t cx.tvtrurrent in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, aeg jv;ctz;aic22,)w n nd an inductor of inductive reactance 30 W are connected ;2atc2v gz;jiwn ),ecin series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-/b r,j4l tw) uih-hepm olo*-jna()t3W resistor, a 10-mF capacitor(jbo3wp)i* h-lr ol/ ejn)u, h-ma t4t, 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 necezl )vysw z2v05ssary in series with a 500-W resistor for a phase angle ofzv0 v ly)2w5zs $40^{\circ}$ 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 = 10n4klr zn36kftl-ix)f* 56y sq.0 mF. At what frequency should the circuit be driven in 5qsk r*liyf-f3k6nt 6n) z 4lxorder to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15.0 W 8eyl mxwmej,je7(-:n inductiv8ymxj ew :ee(m7 nl-,je 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 Af-:;ehb 83nr 6tdbds qC 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 impedan,on)c (ha c ,yj32mwqv 6nf:aice of 60 W and a resistance of 30 W. What is the power fact:f o cv qh )ay6ncmn(,aiw,32jor?

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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 resistor,ih+:b 3iy qy4 g-bxm3ioto,eq m;0ra , a 10-mF capacitor, and a 0.45-H inductor, when cono imh o3x;3qr iay-+ b, qymb,i:g0e4tnected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 1ron 5cd*w(0 e wpua,cx:-uo x85-mH coil in series?*pnur8cca o-5,(dxeuw0 x: wo

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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 frwgz ,edz;stv 580wv a7qj7 io;equency of d5ie v z;wj vwga8t7; 7zso,q010 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 iur;r l7* uq9nin series with a 3.7-mH inductor for a resonant frequency of 1007 ;9quilu *rnr0 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 mustlaukd+y,jd e4 6sxzn df-.57 x be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1004ul+d7-j.d as5e xdnfk6xz , y0 Hz?

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