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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 ofhyts 6qidhm- u2u /zg1 es-9)9kuoq4f magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction state.am:r d9tmhlb-)z 3zxd f v/csc)u0k6s 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 inlmk / su ec*)ra(fuy7(lwor4 fu0t -9t a coil produces what kind of change on thf ro-rs4uc0f9eltt l()uuwkm(y * /7 ae 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 throuo5i 1m)q/ai dwgh a loop of wire produces what kind of change on the indq1io)/wdi a5 muced $emf$, 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-bm; -bf+ s;,ccgj rnbove35 z loop of wire produces what kind of change on the induce -s5b+r o bn;c e,-gzj;fbv3cmd $emf$, 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 lsrazm3t-m(8a( yn b 8field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in een a vk+7x u;v l5fn.b)x3 al9xwj/q9a conductor will be that wvaq e +xb) k.x;uwnvx9e3/ll9 af5j7 nhich 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 on a horizontal table. A bar magnet is held above itru6heat j 2/ y7,l2g zobbq ms61ql64ws center with itsltgomwqubar1y6 b h24 6/2zelj7qs6, north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held c 0jf,9 8)z45 ,taquhbq bsjzzabove its centezuf qj59zhst z,j ,0qab8c4)br with its north pole pointing 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 inj;90pib61ep*f kxp xc a region where the magnetic field vector points straight up. The magnetic field vanishes suddeb*;exi 09p f j6cpkxp1nly. 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 e/tubk: /dfo 7where the magnetic field vector points straight up. The magnetic field suddenly grows stronger.k/7/b f:toed u 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 apf3o ,k2bg)hp region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced3b, 2 p)opkfgh current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an eve 9vt 5a pasw*v1v gvb, xmv6-bv+h6t.cr-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circlbapvc9-+wvav*v6. s,tht6b mg 5 vv1xes

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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 north pole entzj;9ach)gn ,wrl 0 .t0ad.zzl ering first. As the north pole enters the wire, the induced current will be (as viewezj; a9 wa0.tlz l0,hrcz dn.g)d 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 rot9 qhj+q)5 kyqdated 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 orienthkq9 d+q 5yq)jation 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 about an axis whoj;zpy:mv jn4.j1d :i;z; g:ucahs r w5dgmz- 6se direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop'z ys zdpm ;.-ujjar:; h56id:cmgnjvwz:4; g 1s 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.h j5f 5;8zeqvs
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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 th;ln9k p()am;- cax;;knm mdhtat 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 fieb)f95 . op sf-,*ijpmrtz3tdlld. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is mo;l. anel s,s4gved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potent lg.s;4lna,esial 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 angul0bup+y) 9hkw qsl5g :gar 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 transfvj4odm x da:ngw48+qgz1, :yworms

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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 second. The frequen4bf p/o- fo5vqcy of thpff-b oq4 /ov5e $emf$ 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 uuf,bbo .-lz:r sed 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 that fqu+qxq;qqm:1ns nlk58/ ,v-, qx rht

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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 morf4(a5coub f0o e loops than the primary coil tooab50 (cffu 4hen it 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 primar)n skmi( jxt)k/ dwx29y coil contains more loops than the secondary coil/( kmsd9xn 2kiwj)x)t then 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 .juip7c0nnse5 ,sib* 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 cipgg: vqqvkhtdv l26-353 k0 wwnk+ s*nrcuit,

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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 inducto xuw p0ms8i8o(r are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with t u8w msoxp0i(8he 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 serdi5vgcopr;a. ad/+:i ies to an ideal battery of constant terminalv:c/i+5arg opi. da;d voltage. At the 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 inductanir:hm sg3 d;)o3 s4 qssar8(vhce 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 resistan c l-vf4cw:2oshfty, o3d2y w,ce R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected i2 az)g4qw k7njn series to a battery. The time constant for the circuit represents the time req)zanwq4 gj 7k2uired 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. Tupuvib j xe*nlq7dejw9x-; n )(4( ;ckhe battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to d(;4l*) 7cepnj-qbuv 9n(d;ijkxew x u ecrease 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 units excep i.r jum,fl4 d 51x6pftcauy33t:

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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 any *ygj33ky7hx 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. In this circuit, the curren,j 5 rq0wqq;2csgdi7y9 ov s8hq2wr8o9s i v sj5;qg,h0c dqy7t

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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 cb b6537 2ciinv xw2atuircuit changes by what factor when the frequency is trip 65cn vtb2bw iuai732xled?

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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 inductor is doubled, the 411kzsy7kzj y inductive reactance o7sjzzy y1k4k1f 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 voltage across an inductor approache*9oxd3kj rb x wy7:k-6u+aqhut5yo u5 s zero, the inductive reactance o-b 9xj5o*u7yu5+xywq tdak:3r6k uo hf 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 connnx+qlu *osb (5e1vj(phs0h/x ected to an AC power supply. In this circuit, the curren +1/u vsl j0qhxp(5enbox sh*(t

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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 factor whe;p9qyzfg ,;xq )md.zct tm 25nn the frequency is tripledt;;z5 mm zypgn tqf.qc,x29)d?

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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 voi.jb, zs6j6 q1l ;.- ket9dijotqoex(ltage across a capacitor approaches zero, the capacitive reactance oxt6; bjqsdjj .ot6zl q19oi eik.,(-e f 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 anu1 klh98 neay(d capacitor in a RLC series circ1uyhak le 8(9nuit?

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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 a7; zew1bomv 5sn RLC 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 impedance of6vmcy6(flywktzee 3 ;)t, 0bf the circuit increases if R increases. When is this statey) b0wf vett6mc,6ky3(z;f le ment 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 circuit increases if-(pqshr v)xt90h t- az $X_L$ 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 cirwdk3iq+/ b; wacuit 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 bo eh/6 4cur sgxtauvoq*):8.foth double in an LRC series circuit, the resonant frequency of that circuit /: vt cqgr* 8s4oa).ouf6hexuwill

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an ACgo8p 0fwjnl5 +z6p:re 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 whe- -aet,kpj (dtn

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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 c7-1uo pirn k6rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnpin ur1o7- ck6etic 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 u ;(5y; eujcug1ef6wb+hqyt zj:9y wz7niform magnetic field of 0.20 T. Find the magnetic flux through thef;1t7bjqg :yewye( wh 5zyzuc uj+9 6; loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radiur7a8;b jpv6 ulh 2r*wys 0.10 m is rotating in a uniform magnetic field of 0.20 8*vy hbr26;wjl7arupT. Find the magnetic flux through the loop when the plane 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 jvd w*:sqkvzg;4 ,6.yh9f ya kof an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil chan, ni4qoueym+ 3 3mlhfva;fy51ges 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 wibxq8 9zxskjx *2c; lc9th 200 turns of wire on a square 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 oj k8 x;*qxcx9lbs9z2c 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 aqr /ue9;ye6eh2mm1 yzn area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and ar939lhf,j y 8w/tehmx0e7iwub ea $0.20 \; m^{2}$ 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 horizont f3lc+f zy*+hmally at a location where the downward compfm fc*+hz+3ly onent of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rowchg 7o5 puv 7a; 2b:j3rcz8eatates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a concouz82cwh 7jb:35;ae7 vr pga stant 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-sectionay l-fi bgz:)6v mawl 7m-t51inl 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 consiym3py3f -z:i qsts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 recta82( :spn vlzctngular 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 loops 8pl (vc:ztn2 rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of r7+x lq(u5h ezd0zu2a100 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 )vief5/w8 ufo(;oqxd12 V maximum when rotated at 60 Hz. A magnetic fi/f u5v w8qfxei)(;dooeld 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 m k:gaq42 k- o)jll*lopd/q0*ik3vsj saximum $emf$ 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 rejr t9 nc7chvnr44pf4;sistance 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 o9y:;b6 2 p3bclmufa56q p iyzmn 120 V AC, and when running at full speed it generates a backup:mm935z;q clf ai py6b6y2b $emf$ 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 pnm iv. soj5,b(ower supply. The operating current is 1ms.(j5 ni,obv.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 resisb :p-o50ld7l ihp:zjnj( u5)bpa0lj ztance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full j(:pjnu p:5l -07z5dlzj i0apb oh )lbspeed. 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 connz.4 /h::g wbb wgpkux4ected to a 24-V power supply. The operating current is 1.0 A at full speed. Ww/buz k4 4:bw:pxh. gghat 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 82cq y :exj/w7ih9/oe9axkoy needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A 9dk+np2nqduq2p 2,pm to flow in the seconda2 u2 dpnmd2n, qk9ppq+ry. How many turns are in the 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 rd agr u,mmf6 -gn1ub4db2i1.110-V primary if the 24-V secondary 2fb,1 gri .-m g14dau 6unrbdmhas 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn s , pp8 j13tm*0:rwkqigltc.af econdary coil. If the current in* ta 1 mqcrip3w,pt :j.lfgk80 the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows tj u*thr5w(73f.y+g0k 4n ohv /bnffoin the primary of a transformer. Assuming 100% efficiency, kht rt*f j0w/4n.ogbu+vfh3( yf 5o7nhow many 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 provides 7500 V at 10.0 mA(6ki glh:pr4 vrnd*p 9yci)o 2. The primary coil operates on 120 V. What does the primary dra(c96i)n lgor dh 4vk2y*i rp:pw?

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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 -bovqo5 -,6zhd h0 eoaits secondary coil. If 120 V aq-hh0eza,v doo6o5b - t 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 coila loic ygec* z2y).p:4 and 300 turns on its secondary coil. If 120 V at 2.0 A ec2*i: y)zac l4og.pyis applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 tuef k+3ix6,pv/sxsi i)y k.j*i rns and its secondary has 200 turns. If the input current at the primary is 100 A, we can *y+f.vk ss,ix3i6px) eiki/ jexpect 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 trax /r.a7v/ftxq nsformer has 100 turns and its secondary has 200 turns. If the input vo7a/rqx fx.t /vltage 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 t moouh sl qtls- ,.ilxi.e;* ew-h9/.nurns. If the power input to t*;, teh-i/sx9.- onhl. mq.os iwullehe primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of cu4h:vd 9y8:l ma. zr-et5rmsdprrent at 120 V. The voltage is usually stepped up to 4500 V by a trd9a -predh:vmy l5.z 8:ms4transformer and transmitted through a power line 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 current at 120 V. The voltag cz:p:1 m00fbze1wmcy e is usually stepped up to 4500 V by 1:by:fzcce0mmzp1 w0a transformer 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 is usually steppe v6u p+7rkdo2rccu( gn j1k1s8d 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 the transmission linu1ckn76s(ro jv1 uc2k 8dg+r pe 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 0.60 W. A gepfwut0ls*w 8j.pt .r9: y8uf hnerator 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 . s u *ywfrwhj.:tt8ppf80u9lof the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistan73w5e6f gvkgvce 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 orv 57g3evgw6kf iginal 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 )/zu,)i*ty ka sqsw q.*.oyyjline at 1000 V. How much less power would be loyi,ws.ay))*qo*qj zykt . /sust if the power were transmitted 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 is 440 V at 20 A. Itqjj3t-/qnn b. -pgkw1 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 3jn q/-q g.1-tbwjpnkin 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 curryaruc0yp 3. w b1/yy6kent of 5.0 A. How much energy is stored in the coil 0y/pyw63ua ycb .kr1y's magnetic 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 indu bk:n2h4 1gg :k e:wib/er4gfqctor. What is this circuit's h:rgi4kw:2:ege/gb q4n1 fkbtime 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 Atwno/ w7:kzwu9-/u v dC 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 current?z.l 9i( ofcg+cbn.l: u

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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 is2jt fw-t902en 8kudia 5 yr)zu the resistance of the lamp u-driw92 ta nyz)et0fu 5kj28?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply.4j kkvbs- bg a5fm6+u,bh y;v/ What is the peak current through the resistora bkgv v- bjy6k5;mhbs/f u,4+?

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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 acs pw89nm -wx-t-yg k.j power supply. What is the power dissipated in the res--s jkt x8ywnpm9.gw -istor?

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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 resk- t/.gg :umm5qgknr9istor 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 resistor i:bxizmnk-dsv 122f2-7hzab:; x c hdps $I = 0.80 \sin (240 t)$. 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 ebl9z6) c:mbidu, +pya 50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a ml-i3 lo yck(b-0as 1h1.0-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 ryzok v)c;e7 8d2x)61sfhh :jagos:dof 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 14.0-mH coil have 14.0 W of indu-d4c+q1csjp sqb me vg4a,, d3ctive 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 ih* /kg p3rlib.nductive 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 6 g(heg8- 9hwbt0-mH inductor when 120 V AC at a frequency of 20 kHz is appli8(9g g ewbhh-ted 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 r*i 87.2 aai ujss +lu(i3wbpxthrough a 2.50-mH coil due 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 capacitivjk8+z,:)qw6agj nl kte reactance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at 10z) imb-6x9 yui 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 ds9b6 ukwsep 3h/-.lw 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 reactancmy vb)w+ z2ye5tt++aiy/ cb :8) azfgle of a 0.010-mF capacitor be 100 W?c2+ 5/8 w))ybbemyzvzafg it+ a+ ytl:

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 cxnv4 atmic)ga5 z. y 659b6av kv7/*gfg xmr5Hz 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 sedb(8oi*8vuqk ries circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive react*q b88ovd (ukiance?

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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 )0+ dxez02 m1jq61vzy)irhoqkn n sy8 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series86qqz0h0i+xyo)m rk1) jns e1d znyv2?

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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 resistor,u*h h y)v*upp5 3wca)asfo+f 3 20-mH coil, and 1.0-mF capacitor cfupp)ha3v+ s3awo* f 5y)h*u are 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 z *pbuc 1q9yx cjqm+8,inductor, what is the impedance at 1000 Hz?1,q8uc+z9 bpcymq*x j

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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 wito7glkx.w eqt (9 p;ov ry+4f2uh a 20-mH inductor, what is the phase angle at 1000 r 4vk woyq.2u xg9eof;(+7ptlHz?

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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 1.0-mF6 cdr37euwlz vd s/x-suu 2+o/ capacitor for a total impedance of 100/d7v o u3uss l rzxcde+2-wu6/ 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 capn f,w:v6q i8xvacitances is needed in series with a 100-W resistor and 15-mH coil to get a w:v qxv8n6 if,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 i; zoye2 * mt g/q6*vpqft7ynx;nductor at 5000 Hz for a total impedance of 40000fvmpyte* qz*x6;;o y2ngq/7 t W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz fo*hzrmwo*/ mm)m5:i pkr a total impei m r:**z/ohmw 5mm)pkdance 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 impvbg*-z;tr1hz)e ;rb)y,c tak edan*chry)1 gztb ,r-ab;tz)e; vkce at 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 .l1f6qfk /dcjfmi1 /tin series with a 10-mF capacitor at 1.0 kHz for a totacjtm/dq f./ilf 6k11fl 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 a;lj1qyqd6 7 *dbtckv 0 phase anglt17 k*0dlq6 bqd;c jvye of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W0b (vgl5atqrrj1b ;fyq tn;6g97nh :a resistor at 1.0 kHz for a total tqy( 5a:b;0n6 vrg taf gnbrq;l91jh7impedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What ,p2swnyjsl:c:)7b jjlm ,r;8te lp+ bis the phase ang s8ytlbmp+l:: bpej) c,jr7lwj s, n;2le?

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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, and3rgx)flzq bag300 ph6 1.0-mF capacitor are connected in seribpg0l rqh6 33)fx0z ages?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitr lz-k wm.p)s )f4n5c,r4ndlhor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-- d,n.)l5 c4npfh) rrskwmz 4lHz 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 capacitor of capacitive reactance 30 W, rg* ngi7*ud bee7lesu5v;cq:a,q-h 6 and an inductor of inductive reaa u5r6qqn**: hl ;bv,e-7usigee 7cgdctance 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 RLC circuit containing a 50-W rhb7iolf5j j3jj (z5c*rz cn,5esistor, a 10-mF capacitor, and a 0.45-H inductor, when connc ro5j5fj7jlnc5b(hz,i3j*z ected 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 fornizs ln6b-96w.qas-d a phase angle of d-w6.-az9 nsqilb6n s$40^{\circ}$ 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 = )vfmb2i v,cu: 200-mH, C = 10.0 mF. At what frequency should the uv,f):m 2 bcivcircuit be driven in order 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 wi)cvmwf(y nu f.7 79anb0moh3ith 12.0 W resistance, 15.0 W inductivm0 i(wf73 n) 9aof7.vhnycmbue 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 aqn t.;lv9;z d+lgm3pon AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a red6c bwq:n66c +6cpmhk sistance of 30 W. What is the power fact6 :w+ccnqbkdpm6 6c6hor?

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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 5fw4cftkamj6 dbby.:2(/ rnob/ g y7n50-W resistor, a b/7ndwfobbar4ytnc . /: 5mg2jyk (6f 10-mF capacitor, and a 0.45-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 1.0-mF capacitor and aj+g;lml 5 tp70ign9st,kg 9f j 15-mH coil in series?t9gk n;f05l,l7gijgtsm 9 pj+

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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 pp9i q k cb*fm;-04ojxa 4.7-mF capacitor for a resonant frequency of 10 kH;pmji -q kf094obp *cxz?

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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 seqe j t+oqm.,e78 kl0ptries with a 3.7-mH inductor for a resonant frequen8jlpke0e to,qm7 .tq+cy of 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 series with a 30-W resistor and jwp wmk5nw6hmev; /4( a 40-mH coil if the resonav(k54wjw m;m /6 nwphent frequency of the circuit is to be 1000 Hz?

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