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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic fluxnwkoy(krt5ccx m. 0 /4kn9 e2p 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 inductio1a ugeg /q)+blap4fr+ vr9c3, uknst.n states 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 o5qtsq1 o2zfy3f loops of wire in a coil produces what kind of change on the 31oq5 zy tqfs2induced $emf$, 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 f;p+n6iptbou hb6aqiy1 3 pu64 ield through a loop of wire produces what kind of change oapi61uubnh 6tp iyo4 b6q3;+ pn the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind ofqnlf 7w qr/.u9 change on the induced l/ uqq7 nwf9r.$emf$, 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 magne8)crk xpg;t6)6 pklrw tic 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 in a conductor wilg bsbf gf 2y km7z(t8wjc/q6;0l be that which tends to produce which og j;f ky/2b8 6sw0z(cqgt7bfm f 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 fla;yz2 cqf*6/bg h(wz fvt on a horizontal table. A bar magnet is held above its center with its no;f6qgwh v/f(yb *z 2zcrth 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 heldf+ hcl5d+pbl -4hyh z2 above its center with its north pole pointing down, and relea2dc-5yz+hh +llb4h pfsed. 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 topt hasw/0l6q3o9q/+ s ydyqz2 p in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from abovet q29/3y szp qoldsq w/+yah60, 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 fie(0p oodg3pf(k dpb wth:x+z75rv i;4v e;z/uf ld vector points straight up. The magnetic field suddenx;:v tugwopp;evp+/5 zkb(fr 4f 7d(3hdzio0 ly 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 horizongfumx;5i/ hs 05o/bbzu5 vln9tal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced c9oh; n gxlsm0uvizb u5fb/ 5/5urrent 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 jqu2tr0lk /2jxv1rpz gv w6a4j i 2.o5and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current cir/waqv. 2rzkjt pj1r 5jo2x46v0 igu 2lcles

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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 enevdlrbi lj.f ,.-d8u o,6a2nltering first. As the north pole enters the wire, the induced current will be (as viewed fr6,d8frdjb.e .ll2v,on -ialuom 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 axm :.4nx:rx v7y-ojthp is whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the lx rj.:hyno-4vtp x: 7moop'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 rotatedytfff 17.znb , at constant angular speed about an axis whose direction can be varied. In a region where a uniform mazn.b 7y ,ft1ffgnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.2h2gi6 rnh-o2qkb9z h-c 6poh
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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 ugx1g q/:e i0b,ihhe6that 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 fiel3 r9rea ga5wyg b2jbs3-9xo(pd. 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) ivczn 7w/. j; wdkqis,kit*,s0 s moved northward at constant velocity through a magnetic field that points s0 iw.ckk ,tv7i/ qd*n;w,zsjstraight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a tx1rgq0p65sgconstant 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 transmlqiukyqj92 ca;4c g t;6r7)gforms

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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 r6i s.ynn+2oj.qimwz2-xb gi )evolutions each second. The frequency of the+j 6 bi..wzi2yosn-mnx)q2ig $emf$ 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 uslub8)3d aa6;s2vb3bu:5s zgb 1cr u gzed 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 d(lw k;;rzb; ga9qx ia(iu,)nrevice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than ts8 b 0fr9dfqki oe:/eyx7 b68che primary coil then it is ak e:coxqy/08f7sb 9ei8r 6 fbd

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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 ts8 yv6pl2 qdi15cx/ glhe primary coil contains more loops than the secondary coil then it cldp/5l6y8i2xg 1sq vis 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 pwcf5/giissmf10c 5 . fower 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 cu;;8b wc1iayw57 0kk l c-gkjgircuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of con;wo));:rs mn durze r/stant terminal voltage. At the momenesu;m; z)w rdo/r:rn )t contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in s)7f4of:vub6jyhj:y( temoh q 3 vy)t8eries to an ideal battery of constant terminal voltage. At th: mf 7oohvhe3y)ft6u84j) yv(tj:q by e 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 inductance L and resistance R is connected to an z6p)br.fx -gvszh*4u $emf$. 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 inductancttf+p;n jf 05fe 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 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 bqv; ewhf mn1e 1gd2w12+8hotxattery. The time constant for the circuit represents the time required for the curr2 tenhm1w1w8qehf+1go; dxv 2 ent 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 2v4p lrc/u)lb6u- mbn in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the currentbbuu6l)/-2n4vc lr pm 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 tnm 4 l.0q*qn3p.ezcrdhe 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 connecteh 53vtho8 pu; sv,iwtsoq j*97d to an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In th g,oczs: 08l:xo3tdx8 rod(dy is circuit, the currend o:d(x8,: l8zorgy0xscodt3 t

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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 d ;9ubpj3ufzi6 //dld changes by what factor when the frequency i 9jb; du//pd6ilf udz3s tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an indut2phg;j 6lje+ ctor is doubled, the inductive reactance of that ; p6tlhj2j+eginductor

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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 )fhqvobx k- .;ih9:f0nyo dl +zces 6:AC voltage across an inductor approaches zero, the inducti0zl:dyhc.hf6bfe)ov - x qkso: i;9+nve 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 t3csgo m03hlp4tfuc9cih0w1 : his circuit, the current3c u :i0h4f091wc som3tchlpg

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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 factork (/rhbug)v(w when the frequency is trihv uwgb)((k/ rpled?

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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 3gwfdxel2+v v +*yr8u zero, the capacitive rea fvwly3gdur82*x e++vctance 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 bea: lwogcnw e1p19o 9fq4 r,s.gtween the voltages of the inductor and capacitor in a RLC series circuit?fes,p1l :gw1.ong r499c owaq

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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 a-j iy(lr/ 95c vn+ckizn 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 imped/u84l a/ (8(ifqjmydt-b y.roovtzt9ance of the circuit increases if R increases. When is thov8y(tjt/ (.9o- uba tqzy /dfm8ilr4is statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increaseza*q*q u/owwwt n(839j n -8vfd vowd5s 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 cirz 7yun;o* 4c pb;nx k1 h/yl,f9jjx6ydedc0z(cuit. 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 capacitanc,otpru.ixizz( c5l- 3e both double in an LRC series circuit, the resonant fi5zzuox.cli rpt -3,(requency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is de1)bwknzb4y 1 i mj h1vc6k64yriven 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 occursfsc ug 45 yx;gy.c6l-s 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 0.10go00lnn),e gw1 4sv n 6e,/rajco- fkt m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of th1/6vnl,- nfw,k jg4etsren0 )oca0oge 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 m467 br rtrapv5ozzutx1bw37 4 is rotating in a uniform magnetic field of 0.20 T. Find the magneticr1wua7xr 35o74tpt bzv64b rz flux 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 rav zt84w f.75clf3 yyqtdius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flz.w8fyy q43c7l t fv5tux 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 r l ;nwjgtza2urw6/:u *chv7z2educed 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 changes f31mr7q( u1boljvmv 2d rom $4.0 \times 10^{-5} \; Wb$ 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 9he f zk ;kfu 4777kigcqp*fb:of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plaq;*k kif c :hue7ff7gkpbz79 4ne of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire wluobwry,.4r z(9rh/ g ith 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 and acmw6y b qtu:r, ehq;s2zse6s1wu+, ,mrea $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location where the5vm680c fyq+ fk1jdxoqp0 b7e dowck mpq 500 6yoqjdfev7+1fxb8nward 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+lgilt9mmm0e5q -z5 n rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant mq+0 llnm5i59 gme-zm tagnetic 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-sectionbi/g1ekpfx3hh : 65r3v cg. v/ dew;lnal area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wigaffbskvb 1o9e o/2yr.*lx/( re 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 rectangu3kedzyo:lod8(6ix)vn 1 1p dilar 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 pei o)v:d1l138zxd6in yd( korotation, 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 erx:5vuz)h2h1qd( z ywire 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 construtd xo z 5,dbl2vrm610oct a simple 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 area of the rotating cxr2o6,tdb movl0d5z 1 oil 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 6n5 2,fg xdkfgmvpayf4-+b0dmaximum $emf$ 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 t4n8 m(6h ckb gi*7wu,fcpwkz2 9.pxj a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor o,q(dyk 30sinhperates on 1h y,(3sid nkq020 V AC, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to ak/u f8p1armd2h. adv 93ed 1ft 24-V power supply. The38ef91t2p vdd mrhu /kf.1 aad operating 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 i*0zwkgts af+w/ b2i h:s connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is 0h+ g f*/zsw bakt:i2wthe 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 connected to a 24-V power supply./q-hwsghgl(pf6q3x. Thewl/p 3f(g h- 6hq.xgsq operating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduuoq w9 96d oo.b*+iywnce 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 Ahps:nx. 5 l-jz to flow in the secondary. How many turns arexl -jps: .n5zh 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 lk81qsh1 fa-m are necessary in a 110-V primary if the 24-V secondary has 100-1ka 1lhfm8qs 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 se s 60z m qs2xlreziq2m3+cv1w/condary coil. If the current in the secondary is 3.0 zmvsx l2rc 36qe/zmqsw02i+1A, 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 in the primary of a transformer. Assuming 100% efficiencyy(on2k q.5)hzxtbg;tej;z 6w s9x b4 q, n 5 bjz9szg ;)2.oteqxhty4(qx6;wb k how 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 a350-dv*be em7cjlb zbimpe.9 neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. Wie9*m 3d-veb5ecb 0lj7mp b z.hat does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on -hh k8+s2pvlg.-3oknnvb)y u its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the snohu8l v hk3bpg-k )+yn-v.2secondary?

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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 turns on its:ddo c hr49i54jenwf ( secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary? w4dcefi4(o :n9hj5dr

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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 0gc tsm5+hf+0k/yqq n wll23m100 turns and its secondary has 200 turns. If the input cl+mlnch3mqq y s/2tw 0g0k f5+urrent at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary dn:c bqw)-9sa m,nocel7v;5l has 200 turns. If the input voltage n9d :b,cvm7e)5w; nscql -o lato 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 transfor lun-9+opcw l0b 9df4g ylw:j-mer has 100 turns and its secondary has 200 turns. If the pow 9wybw-npldo4g+9l j-c :uf l0er input to the 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;scoj/n*r; pb6/r hyq 7mdfo5 A of 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. Findy6 o;75hsm/q jc*/b dfrp ;orn 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 anm.(ml7 xap4ea .j3 37aksw szt 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total rez.a a7k(p3nam x4s esjl3mw 7.sistance 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 curr dasev3f6a dfftat w*n x.u zlr.*3m1r* g966qent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmi* u6f wt.l3ntd asd1.a*q agv96re3*f6r zf xmtted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km loh gl)oey.ry2tt4v24ong 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, tvt2 2holyygto44. er)he 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 liws15x*gx(wxvb /dzq2azzt9h r)d 0l 1ne 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In orderzdw9ghzx)xb1/ *v0 s(rt2 1z5qwd a xl to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V.5v -+rjbu64wevw-) d 5knyoqj How much less power would be lost if the power were transmitted q wd55--)erbkyv juwj4+on 6v 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 syf5ws ur .jf,my;s h-yv8 4f -(fk3ul20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of vw3jk-ffy4(hfm usr yf.;l58 s- uy,sthe 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 m.) u ulgmvj*-/uk. yxauch energy is stored in the coil's magnetic film.u u/x kga j*.)u-vyeld?

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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 con c/n;wtdm5/kwn 3k hdg ;e7dm.tains a 6.0-W resistor and an 18-H inductor. What is this circuit's time constant? nwg tkdmd.7;mcek/5n hd3;w /

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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 wp x5izdx)f (g;here 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. h9hk7-pi-e mjupbw v,cm6xrix8 7u1( 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).my6n6ai i xo 120-V AC outlet. What is the resistance of the lamp?ayi.6 xmoi) n6

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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 1203ea*.v(o 3 dk1tefq*parmy b,-V ac power supply. What is the peak current thrr3* vy bmak 1df (e,eatq*op.3ough 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 12,x/xw/;adj,)ma dj jl9w :kqy0-V ac power supply. What is the power dissipated in the resis; dxm/9), lwjaw djjy/aq: x,ktor?

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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 resist21o y2i+ tmh:jkbr7tpor 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( kt0: trcxcrr41,qdg r:8l2znz u9tks $I = 0.80 \sin (240 t)$. 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 i;4b+ r**ggwzgonzf: rqgrh)1 s $I = 0.80 \sin (240 t)$. 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 47*q7eely ) wyslwxptlos38: 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-m- 9tsmd6 dba+gv3 xl9yH 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 14.0nz*91nl:. 1 s qfc i5ogvmnm1w-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 b knypl4+4wm8 oa/8qp reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH90skrq;u- l; xjt5f ia inductor when 120 V AC at a frequency of 20 kHz is appx5r l;t0qau f;ks9ij-lied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil 63hd-5qrx jvg 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.c0hej( n.d(zg; ha 3pu7-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 nuhffos/r e,ft ,9gl5 *eeded to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactczqzhb 9*m x yjg8 h2u6rjl-+/ance 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 am l9 wmju* -xbtn(as44 0.010-mF capacitor be 100 W?4 -4mnwa*9utlj (smbx

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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 4g9yxy3lvfpzm),-ts:uzox 3a0 : ypf*;nm z eHz 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 3 2a1i4mn*9j 3i1xx vmrs lqorpon 7i2series circuit with 12.0 W resistance, 15.0 W inductive reactance2on7q2vipo srim3 i 4j*a xxm rn3119l, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH cw5l*am3f2em;f y e4e uoil, and 1.0-mF capacitor are connected in serif maw4m*yl; 5 u23feeees?

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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, 20-mH coil7m+mhsujjj c(p ngx*pz7k86e6p/ k3q , and 1.0-mF capacitor are connectedp3qj(h66cmj+/8zj mu xe*7s nkgkp7p 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-mqqgt0up-e l /6H inductor, what is the impedancet q-g/60q lupe 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 wtd3q v(fpl ip7-36gci ao3nk:lpak (:ith a 20-mH inductor, what is the phase angle at 1000(c:q 3g- ptpn33k pk i(ll7ofa6avid: Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1 nzzcbq1gu.7pj7 .r+ e.0-mF capacitor for a total impedance of+jrze7bq7.g. pcn 1u z 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is neede3ab na 5ym-ko6d in series with a 100-W resistor and 15-mH y6mna3ka ob5-coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000nfkjdimdp v/1e md nuv+)387jt/ an /0 Hz for a tot1m/8n av/ jnd/) 7+e0pj dvt3dfukni mal impedance 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 for a trb61 izal :1(3r d/cxu( jjc e5iyqpp7otal impedance of 1507 erb56xr3cj(u1cd l( pq i z1ay/:pij 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 wa22i -x1jpnpmqn 7(gvith a 20-mF capacitor. What is the impedance at jn-v(271p2m ig qnapx1000 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-mF4x qzq/8 3cjavaq v)-c capacitor at 1.0 kHz for a total impedaa) 3 xv8vjzcq4c/-aq qnce 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 ;wiykc + xhqwgp-10p,series with a 10-mF capacitor at 1.0 kHz for a phase anglx; ,ipywwg0ch-+kq 1pe 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 for a ti2d4a;l)cesi 9tcl f( otal impedance offds2iie 9lc 4) (clat; 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 insoa.51 ssb pe1 series with a 100-mF capacitor at 120 Hz. What is the phasss1 pesao5. 1be 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 ia,e9cav:b( mv/- uwb100-W resistor, 20-mH coil, and 1.0-mF capacitor /vcbm u(: iwaa,v-9e bare connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor,pu9j +8mji 8hz and a 0.350-H indu9j ui8pmjhz8+ ctor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an inductb6dsf4xz(gt t cp*5d,5px ,/ gcpu ;lxor of inductive reactance 30 W are connected in s ctgcx5/ bf 6d,,zu;tgdplx* s x5(pp4eries 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 cign4 .:ri)z ylhg3q ;jzrcuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60zhz:y qli g)4r3jg; .n-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 500-7(1fx*x:* q1bgfo8o vsq fvyfW resistor for a phase angle offvv b :q1gf o7s(xxyqf8*f*o1 $40^{\circ}$ 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 =rc plpuqa+,-,k+i,s bh:r8xi 10.0 mF. At what frequency s,x u,p :-k8hr+rb+p ilcq a,ishould the circuit 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 with 12.0 W rey 8yy/+wr3s1 ntr7u.eq,o p hqsistance, 15.0 W inductive rea/s7yh+u r 8tqyy o3erw.1, qpnctance, 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 ACrxytw8o li:,vl/l *)swklg..2 srs8b 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 resizwozkavey/*-la 5 -x2 stance of 30 W. What is the power fke-y v z-/w5zax lo*a2actor?

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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 rcdclk)+-s(h j1zd3j r esistor, a 10-mF capacitor, and a 0.45-H inductor, when connected ljdrc dh13kj(s)zc+- 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 15-mH coiz9j oyut e;w)oc;d:c)we m ;9n;2ayhbl in series?:wth o y ejnba;d u9c;zco ;29;)ew)my

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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 s( dnx3j 5ix2rjeries with a 4.7-mF capacitor for a resonant frequency o35 2 xx(jrinjdf 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a reso)r ju;1n qkpz:q -gi; 28lappjnant frequency of 1p j8gi-)up2 :n;1q zpj lkq;ra000 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 agka8c*l6cscc ;xi o94 s9fb aj7e11qfnd a 40-mH coil if the resonant frequency of the cirfecclioa ; s19abfk gjx49*8cs6 7q1ccuit is to be 1000 Hz?

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