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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 exce,i- 4cs;a9dwj* x;fwsasa 3o npt

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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 thf ar y:q sd w+w13mx p:dk4 l1rs(6ngq:f3h*bpe $emf$ 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 produce a2cyj8s z cl8hpg.uy 9wx.a*:s what kind of change on the induce asgu2hax.cp*cz.j :8 wl98yyd $emf$, 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 fieldx mfk*hbze 0)+;iatb3 through a loop of wire produces what kind of change on the 0i ;x 3 f*bh+t)akezbminduced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on thf- oegc3xou/j/jih ) 0;wmt: he induo )gxtj;h-fehu:o cim3//w0jced $emf$, 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 magne2cmc2 (y uvi7gj/ao *ctic 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 indw ;mg8e wz.kuk.*109vbg txkk uced current in a conductor will be that which tends to producet0 xev8gk;uk w 1.*mgz9.wkbk 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 horizo +wzfg d)l,yz:ntal table. A bar magnet is held above its center with + :l,z)yfzwgd its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar m3n peaybt8 vs7-uc(p(agnet is held above its center with its north pole pointing pu38 yt-cea7vbsn ((p 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 region wherw,/rs 2pwclg 5e the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from apls wgw5/,2cr bove, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic plmn,ui7 -; mp+t( lwefield vector points straight up. The magnetic fielmli lp(p+;mne, -utw 7d 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 horizolo;o :p1ald w6j8t heallo)* 3ntal table top in a region where the magnetic field points straight down. Thw3lojl dlea1; *8)t h:polo a6e magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an evem+.7t9w gcg +vo5cwo mr-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. .gotgv c wmo9c5w++m7 When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north 2t3pt udbd;r-k xo0xd5z +c.jpole entering first. As the north pole enters the wire, th+ddtt.2z5bucx0 3; -kpdrj ox e 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 axwlkzy 9-h9fl/is 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 i/zyfw-k 99llhf 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 acms, o7h2 0rkxxis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of 2hos0xk, c 7rmthe 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.i+guj;v 8qcv+dp, p,ni;fvc -ieq) 0q
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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 aeyiioi*2 1*c e :xaupj7tny,fo5 (1gan $emf$ 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 +71julqiiqc)agw,2 a field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northward at oud d sdw;l2ph+0xdmao 2,r *8constant velocity through a magnetic field that points straight down. Make a statement concerning the p2l0 d;rp+d o2 mo,dd*w hua8xsotential 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 r1ek,8:ncg tz motates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator tran2by:of :4a,k h ozizrqa2g0a( sforms

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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. Tcka:,7 rwngg 0 9ftba/he frequency of taf /9w, g0kgt:7ar ncbhe $emf$ 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 t yj*owig*6wpdj5 l dsn y8;3;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 dev,vy,,s uyjgm3ice 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 gvd y9iudqyek-0rf-v41 9+fy contains more loops than the primary coiy -v kiyy109d9qgu+dvffer4-l then 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 primary coil contains more loops thj hvn2qr 6e37nw3 dxn)an the secondary coil txnw6erj )n372q3dn hvhen 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 pok .y)/u pr5oby:a +cavwer 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 circb zsr mu86s3/muit,

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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 inurz*eg fx - xo+nu,o3:ductor are connected in series to an ideal battery of constant terminou u3*rg:xzf-o,+nx eal voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected 3y gsm10.;a;ktkygt kin series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, thek. g1t k0g3sy;t;aymk voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is b6w8//qlu4) m 8qy au hnjo9txconnected 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 resistwh2h svj 1i-.lance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The ti+ z)jwg4 e/kilm*c0f c,7x.(v rlwtilfut z66me constant for the circuit represents the time required for the current trk(6e .fclz)ut,*6 x jif40 wl wmclziv /g+7to 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 ar0 3b +zb*:kzbp:ak qnze connected in series to a battery. The battery is suddenly removed from the circuit. The time cz zkk:3*0b:+b qpza bnonstant 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 s82 8kpc7 n6 b1hqr3xy zcaevm(ame 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, the curretjuv 6thp3v8w bj7 74:pu w)8+jjxqa vnt

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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, thsr:)kbjr3smzif0 8y: e current)rz0sm3:jisryfbk 8:

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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 wha wf*ubs i9vc9w:u/w9 p;8rtpy t factor when the frequenpww:/b*p9u si9tuyv9 ; wfc8rcy is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across aiph:nc 70t; pen inductor is doubled, the inductive reacta;:ect 7ihppn0nce of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, the gx8l.z o/1pgrinductive reactanl ozgg8r/1p x.ce 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 A.q(erx4i ul x/ip yk*b:vn5r,C power supply. In this circuit, the currentb.p(y:li* xr5vi ,r k/qn4 exu

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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 when the freq7mrzh /( szs4m6ogg3xuency is t (m4zo7r3gszh6 /sgm xripled?

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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 capacito-ty1nli3pqu u dl 8ko:qm9n +8r approaches zero, the capacitive reayonn9uqt1 8 mkpi3:8ldqul+-ctance 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 and capacitor 4 oneat/ r3k; isxcw3(in a RLC seriesw a;ix e rs33ot/4nk(c 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 RLC4m llyht ;o6t9 9kgy.rv3vah 4 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 of the circuit pz hd, fam/7*+8tox k+eohw8cincreases if R increases. When is this statement true ochxzpm,wt7 8efd*8+h/ko a+?

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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. The2cka*.. bb kal impedance 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. The impedance of the circuit increasebt0 v78xwkj (uc 8j4.ghtw mr6s 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 st8 (dhkjt(o5 2tg8ia xeries circuit, the resonant frequency of thh8 5oxi (tdk ja82gtt(at 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 that is driven by an AC applied volta/ 9t1ilq8mwu9bg8cwp ge. 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 cinj .)vag7uk16x*1l 0ysew j scrcuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fiej q;-p7lwz 0jy5vu :apy f/l;qld of 0.20 T. Find the magnetic flux through the loop when the plane of the7yq/l p;5;laqz f wvj0jp-uy : 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 ms4 * g*kozp(.id) rkvhagnetic field of 0.20 T. Find the magnetic fl zph*v*g.kk( dsio)4rux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a unifqyaq c0b63 s8)zdm6ax orm magnetic field of 0.20 T. Find t3qzx)a6msc 0bq 8 ya6dhe 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 of an adjustable single loop is reduced from6 y2yv bn7iyy1ao(ozb 59 +fqu $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes x+0*bm llyei*1vht1p/ovz u :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 sqm2 8s r)ds y0l*cn.wgzo;9suhuare 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 a).m0 nl cs2ohrdu9; gz syws*8verage value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 t*mag .nhu 4t:zupi1+g.u0jpt urns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and ar61jt ubu:rgavts( i zdua+ 22+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 horizontally at a locatih9knolyw8 . v9on where the dowokw.8y 99hl vnnward component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constanti(j., 7nefw -clfdix 5 angular velocity of 2.0 rad/s about a vertical axis through one of its ends while if7d. jf(-e,xw 5ici lnn 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-secti x.l,s1eptwu12jn.3t/k x(dp frpw,n onal 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 consis jiu5p:xh5x1;ij f(zets of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on itsw5 iko6wrjdjugh37 i0q ljy/ .91j f*k 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 jyf.iw5l7rjj1jd 6 /9k 0qi3uwh*og k the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire o ;c.gbpc1*dp bf 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 l / dbz// (j7xl;wbz4)jvkuyysimple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the /v zjj//7 ywuzb(l4)db ly;xkarea 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 withwn -yx0e 3i) ,d3vwtmr a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The hw- (+: ev/rd uck(ndomotor 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 ope1qo) zejr gql4;o8o-r rates on 120 V AC, and when running at g1roq8) oqlo-4 ; rjzefull speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24f,yozf0c2lo o-30zhf(x e-t d -V power supply. The operatie0z h,c 2dyx0fof of3t-( lz-ong current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supo1az3ybfs*ij2) dd+; osh.xg j/4ink jt4 sf( ply. The operatdk2doi;(4 4+szji1*j gay. xf3hs) tonb/ fsjing 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 resistancyra-p+3r nk,b6b)l j;, jjrh re 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back br -b6 yjk+rrn,r), j;laphj 3$emf$ 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 2i:kmc/ q z51 dtev:cpto 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 tl*6k; arhg+lg ransformer causes 14 A to flow in the secondary. How l;r6glkhga*+ 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 manyjj-cvr97 tp1thahn o,-) czv :n9cek- turns are necessary in a 110-V primary if the 24-V secondary 9jzcca-,kctv1tn9n h7 vj-h r-p )e:ohas 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 primarsx/:*q lntrg i ea64d ba72j dml;36eby coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the pr 7sd6aialrj2 lbd3bxg4q:mne*te6;/ imary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% effi+ls lmztgq vb xu o 7xlq6;v/0p;:.wp*ciency, how many amps at 24p.tzb:;lgl/ mxsv *6q70owlpuqvx ;+ 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. T:gwwm9pl.hpofd4 f- /d 2yk *she primary coil operates on 120 V. What does the primary 2fps .d w fkm4d/gw-hy*9opl: draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its.k 1xws)qb5f l secondary coil. If 120 V at 2.0 A is applied to the primary, what voslf) w xkb.5q1ltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 td)oza qfezj-kvw 28)9urns on its secondary coil9zd)k v)2qfwza-jo8 e. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 t(e1-, 0 m0zewkax khnxurns. If the input current 0ea01wmnk xkh ,e-(xz at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transfor*e/b*x y0cy on5f7fyimer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 fyo5*f0i*/ 7e nx bycyV, 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 transfo/fv h (o u6pjxozp* h-90uq4darmer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondh*u/-p fz9po46huj x(0ad vo qary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage iot* /9hm2fzap s usually stepped up to 4500 V by a transformer and transmia fho*z2/9ptmtted 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 produceskh b tk;oh16* vsf/up5 60 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted throk1fh p;*6ts b /o5hvukugh 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. Thebgk.s o ayfrksm3n/j. i;: 7h6 voltage is usually stepped up to 4500 V by a transformer and transmitted through a pmjrk. sokgyhf3 sb/n:6 i;7 .aower line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a (06spcs;-w8 gsdol64xuuroytj8zq + ggc 0w-total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss dw u0g l4sg z(rp; odtu w+oy8-x08scjc-sg6 q6ue 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 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 k/bhl3pl o) rw7d7t5o5 g6ybr cxj6* lqm 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 transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original7c6odxh *b5 3rp7qw5)y/jrltll 6 gob 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 lgel189w1 avga *tv,ms ine at 1000 V. How much less power would be lost if the power were transmi*98 vgs,gm11aat l vewtted 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 ir84pgq 6fq h 322abdhns 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 power3qq6p2gr4h a 8b 2dfnh 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 stored in the co39 8 +j6m uzhi di*pb5tjnqvf7il's mag*mhitpjz +u3q5ji78b dn f96vnetic 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,t aq lor;:8ju this circuit's time c, 8aoqur;jl :tonstant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 120 0 i-x9s uls f4/s*9mx0s5ofxmosq+w rV?

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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 oifia ,+pk f5h;utlet. What 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 laock+v)q (6bb 3txj8c8l4 ra 4ybtgbl (m+kvroc ybb83clj (g)6b( l8bx 4q4tatp?

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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 cofs 1+igl )z(dwxj pd19nnected to a 120-V ac power supply. What is the peak current thg1w i+9(xsz dfpd1j) lrough the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power s-0gcbncn amm jl+9g1/upply. What is the power dissipated in the resistor?-1bc+j 9n mng0g/macl

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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 r 4+p8sfo49e4 fclysc resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is 9*z(g jjts(dj$I = 0.80 \sin (240 t)$. 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 resistorr-losgut i /x(b mn7(5 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 inductor at bn.hchm s-p e8/*x2e(*cwbt z60 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 2.5yrtjc bpigk:-2,/i(jjl + 8lk0-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 wilrp y85n-cs l3fl a 14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reacta du;9;.x0f cf tho3 to7or7raqp 0t8mnnce 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 12 gi5i lu27cm,ro8q(1;nhijxl-o( pm e0 V AC at a frequency of 20 kHz is ap nx1iq7lpr e(m52ci m,;8(hij ouol- gplied 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 thr*n7 vl1h2xm pprx*y 31m4ce w:ny5kflough 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 capacitive reactance of a 4.7-mF capacitor jhx95 n1uqwxg;kd9 xh5ulr;qfp;;v6at 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 y k x+47yogshiul(.7ib,:pge 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 capacitorfv(x7fqbtp qt j-6; .h have a reactance 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.dp1b4v cz- c4p010-mF capacitor be 100 W? pz144bcvc-pd

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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 a o(vlhe1ik;) bzngv7 6t 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistan 6fn2ydqke- kkhe 7lh/:i(ik-ce, 15.0 W inductive reactance, and 10.0 W capacitive 7l : e hi/k- endkk2(-hfkqyi6reactance?

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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 150owso0qyk1 bv*0y unvgxzq4tx3, :y )20 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in sny1,xy 3q4y:uv)v20*sk g oqtxb wz0oeries?

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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 1504w nj g4/zkxf9z fb 6t*ao( qhwosc5+(0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF cz*q j f wozc/(t45+fgn9a ko(4sxb6w hapacitor 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 c;co) xm7tc8 tmonnected in series with a 20-mH inductor, what is the impedance at 1000 Hz?;to mxt mc8)7c

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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 w 6js/6ccko j5fith a 20-mH inductor, what is the phase angle at 1000 65cc/fjkoj6s 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 ac y8l+q x(.yah0)i5cx wfaod ts*.l ,l series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 o(xhy.cx +l) s5a ,*.qa8f0illydct wW 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 serimwku:8 -bzc j*es with a 100-W resistor and 15-mH coil to getc8: u* zbjkwm- a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH induct0jwt:j1i r2hv or at 5000 Hz for a total impe0 1j: wrhijv2tdance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz fd34(80x n lg3miob3 zfg c7li0pgqy:l)p5vkwor a total impedanc 7gclyiqn3)vwk0g b3 gp lfz0:l(po8d xi 3m45e 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 xvh08q6qohpzj; -/ jh with a 20-mF capacitor. What is the impedance at 1000 Hzx qjzv-ph0 q;hh6o /8j?

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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 serizaas t 7;v-5tfg)mjs ryr.6v3es with a 10-mF capacitor at 1.0 kHz for a total impedancesv 3t;)rg fyz76.t vmja s-r5a 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 capaci 5uicjcgg .r5lfa 73g2e 5u6oltor at 1.0 kHz for a phase an5 gljog32guafc 7l.56ce5iurgle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for1hqu9hh yx+43wqr9p tr vp4y4 a total imx uy p9qt41qr94rywv+p43hhh pedance 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 mo/bj:. maxtg8z;) alwith a 100-mF capacitor at 120 Hz. What is the pham)b8tao x;. zj:lagm /se angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, annc oh4tz1y 1s hb x:ddo6tp5+1d 1.0-mF capacitor are coc5tt+p:hhdzs11 nxoy db41o 6 nnected 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-W0ss+ 5cdku rtbk: w9:c resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in :9:w0ckscds5t ukb +rthe 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 cap / wpu,uz2xrkh ap/;:nacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to auxa:2u /w/ kpzp,n ;rh 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 cirrbj:cglc zzbdm;);as,t- 7 k.9h pa;fcuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when co r -sz7m9a ;tpf hdzj,bck)cb:. l;g;annected 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 phase angd;( 1q(nuanxkle of (1dnu(na qk ;x$40^{\circ}$ 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 = 10.0:6f g/hn:xlk q mF. At what frequency should the circuit be driven in order to have mfgqk/6n hxl: :aximum 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 resistancb k iyt wj8whzz,52:2ke, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circu,hk 8w2 w:j 52bzzkyitit 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 circuioz)mt* dvuil8g(xn0 h.e kfkwj t * c9jai*1)4t 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. What isang-b vba )-*+bih0b s the power fb sgbh nb*-va0bi +a)-actor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W re/kn5/ukrdma+8oy3lr 8z 1 05kdnn goxsistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power su55z3dn o/k1g/mx 8rarok uk dn0l+8 nypply?

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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 capacsatg; )bqk1hpe hx0e79uc+h.w e3)lcitor and a 15-mH coil in series?3c hku7ebe; l)hs e .htqac0)+pxw1g9

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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 4.70 hfgdnxf7cw0eih;- /-mF capacitor for a resonant freque dfx/;0gef7-w ihnch 0ncy 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 withq;*7 cjccf wz. a 3.7-mH inductor for a resonant frequency of 10007wzjc *f ;ccq. 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 a 40-mH cqhw yswg.ojvnd11l1h ..:e y -oil if the resonant freque.h1ls gywv .e:njw.hyd- 1o1qncy of the circuit is to be 1000 Hz?

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