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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 *bb-s gge/ho.of 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 inducf*2c )-o1h o)eseb miltion 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 of loops of wire in a coil produ yhm( bym+yczcf(86o 7h lx c9kr30ux-ces what kind of change on the inducex9+786zxhcly -0yh fc3cyr( bmmou( kd $emf$, 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 magnetici/q( l zwv4z3c field through a loop of wire produces what kind of change o wi4c3/z(vlqz n 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 of change on the ind 0qmizt,tdczqd).q. 5uce.qdi qc05z)t zm. t,dqd $emf$, 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 fiejqdl erq 96t1q) ht,v2ld 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 induced12t ,sqb nw4;i: bgpjtnn1.ms 0 -hpfd current in a conductor will be that which tends to produce whichnh1spsqt2 wdn,gi-bmn :j0t 1;pb.f4 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 maik zzr oje02cl4 7 k5ayfx-09rgnet is held above its center with its north pole pointing down. The stationary magnet induces (wheno7l5x0 i4 e kr9c2zjy-azkrf0 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 k)q/6lcic4fxc8nt r ,table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the crc4l cq6)nf/ki t8, xfalling 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 tol99-5zhpoih3 xr*a)vzg e7a ap in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewhle iz5zr9o)a-agp 9 3vx ah*7ed 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 levelk( wqt kv:vwen)6zg9 e4w8gk( table top in a region where the magnetic field vector points straight up. The magnetic field suddenly z6gw(4ve8 q9e)vtw kknk(:wggrows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top inr(v)nvp 6k+y .6vs5pfx-lh u t a region where the magnetic field points straight down. vl6- +uh srk.pvnyptx(65f)v The 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 horizontalzbkjftc;75fr, 4i jrn)l t(n8i/ai 4 5-dgtxu table and carries an ever-increasing current northward. Two coig)5zkl8;tfr,7 bfanc4jx4 ti 5nrd/ - i uj(tils of wire lie flat on the table, one on either side of the wire. 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 nor6nei6 6ed e 0 xt9jufg+e0twh7th pole entering first. As the ged6h9 j6uetw06tn7e x 0e+ifnorth pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rot o tpcc e2::xth/br*5zated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic zxc5tr2h /*boc:e tp:field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wil/jdge4q m)h4wfy. d0re is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight dg/l.e4m0hd4fqd wyj) own, 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.2na -sl),o xfo
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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 tdnoelzk2 y(- -8lmeev,sy s21d l,z l8hat 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 xh+5u*0 qgq obx hi,.ga magnetic 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 y x/l4 8xe8junl 0p 1zf8ps3icnorthward at constantpefp8s8z 01 4xx nylu38l/cji velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a cokvi d) 09)acj5n mb28nlryl 9instant 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 trjet61u6hz g 8tansforms

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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 fe :32oibj4bli bu82yi requency of the38iiiyje42: bo2 blu b $emf$ 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 uetd/r-d;v r,x9j*)orsjc1 95 xikw lwsed 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. zja:s62 z xsvnbcm5jl*j9f*

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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 c81 0a cp .iy4 x9qieypl7gwr(rontains more loops than the primary coil ir4aw e9qlpyx0gcy(8.1i7pr 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 t*htzynev2-a w53rv t6han the secondary coil then it iw*nh 5za6e3- y2vrvtts 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 innb 4/b5 87p9 w7xgifhtuhqq+jput

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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 cirfrxsw; *6g 9+cgpi)eig)s /ikcuit,

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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 ser,db 0p;j(hem7 xs-(y jn tllaf kj8a+,ies to an ideal battery of constant terminal voltage. At the moment contact is made with the bat,l+m n(0ha,jtj xe ; bd(k8la7pfs-j ytery, 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 induct ab02o9+k4wfiho wu :eixi6 d3or are connected in series to an ideal battery of constant terminal voltage. Aediwwo9 40bh 6u x: ikio+af32t 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 inductance L and resistanc*+k x8fl )b4mx crsz405sage de 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 inductancekz/n d0y e* xws (miw)4u2ymi1 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 it( uz lkt/l9c2n series to a battery. The time constant for the circuit re/2llk zc(t ut9presents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductw g(jm:qf /m6mor are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time require mw:j6mfq/m g(d for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same unitsj9ng+1 ngh94b z23 zo lkf5qfc 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 suppl*n0o qyy vw8a8y. 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 conneci/ydjl*cc67 t4q;4aa8m lis s ted to an AC power supply. In this circuit, the curren;7y8 64sa4/is*tlijc dmq ca lt

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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)f-0cb sa:m/(tzszee an ac circuit changes by what factor when the frequentea)0-:zb/(semz s cf cy 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 an inductor is douu eaq9i(atv 0h03(ovabled, the inductive rt9u vae qhvoia( 00a(3eactance 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 inducyrc;znqaibx-z1w/g+*3l1 i dtor approaches zero, the inductive reactanc+wdbir *z; 1z/cg- 13 lyaqnxie 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 gmm1ym q;v l5)j;gwi1qal * u*connected to an AC power supply. In this circuit, the curre1q;5jg lag m1i*)wy;m l*muvqnt

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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 kl+5+vx 9c enbby what factor when the frequency is trip+b5n9 kvlecx+ led?

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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 c8s 6j7wt ;glwkapacitor approaches zero, the capacitive reactance 6wtkgl ;87jsw 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 gun hu+fz+ph:2,col5 and capacitor in a RLC series cir,5l: hu chuzn+fg p+o2cuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined ak84:w(a a z:m xz6xzgbs $\cos M = R/Z$, 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. n 3tbzl6yes2rk)by ;f w7)qj7 The impedance of the circuit increases if R increases. When is this stateme )3yw)fs qt l7 kr2nb6be;7yzjnt 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 jqph r,(alrca l2n,-6circuit 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 5iylcol7 y1f9ea;ie+ e);p pb circuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance b isziqh4cs6k-4cl ,x(my a/i,oth double in an LRC series circuit, the resonacz q( c-s,4hili6s4kiaxy/, mnt frequency 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 driven by an AC applied voltage. Att ljxl )wm23j7 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 cirrlmsz-cf4 0j6 ga dw(/cuit 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 rotatinb5ynk,o2 y)s msgbh+frq5 4)og in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop wknmb)4bs ogy,f+q5s 2 )r5 oyhhen the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rspg: 0w 61urzyq6xzl+otating in a uniform magnetic field of 0.20 T. Find pg6r y6uwl sq1 z0z:+xthe magnetic 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 radius 0.10 m is rotating in a uniform magnetic field 8*bzhm(rp gx4of 0.20 T. Find the magnetic flux through the loo4x g(pzhb*mr 8p 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 singlb0codg4 o/*s;jkna(/ nis .rwj.t 8xee 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 changes f,n1v5nbodf g *+0p otprom $4.0 \times 10^{-5} \; Wb$ 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 n07auol v9wgot8a 5( -px-npb square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to t-bwa0p tn(79v xl8-uap no go5he plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns anf 02kzvailg0 ckb3.n6 d 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 p q z)(v6go7enand area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a locationd m5oqc 7-qe+1 qqxs vu9at-5wedm4f4 where the downward component of the Earthw o4qcqdvfe5s -14m - m 5qq9axt+edu7'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 rotatt0gt6 ss g)d0wes at a constant angular velocity of 2.0 rad/s about a vgt6ts swg0)0d ertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator ha- clvc/ pt0s 5bxm2k5 l5crk;ps 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns m :k::0iqz6np g.s j ul:l3bfjof 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 its armatureex kx j :+09 v4nas,umueb5il2. 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 perpendiculi 4 v 0e9x5le2xmsknuu,b:+jaar 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 100 turns of wire s st30fthwkd;k8rt:l1la iz.a+4m/z 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 generas(6lk xta2os2tor with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is availasoa2ks2 x(6tl ble. 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 k8f: w7rz wq.hn5x ku6generator with 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 motv d ,8 oe24il6;wvpqdzor have 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 6.00w wh(+ 8h./b* vm3, ;cfym+objlx pygm W. The motor operates on 120 V AC, and when running at fuw*m+ovbw+ f8 ,hyx/;jyp( .m blc3hmg ll 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 24-V power supplhm5w: )m+cdkaub,c :iy. The operating current is 1.0 A. What is the st:,mu cm) kiah c5+b:dwart-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 poweu84 m-c6pby7gi, kcmsr supply. The operating current is 1.0 A at full speed. Whatu4cbm78iy k cm s,6gp- 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 connected to a 24-V .o).k , ok txr zg*rg,89scqbqpower supply. The operating cur9.b kc*rokgt)gq xsroq,z.8, rent 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 reduce a p2/euyzp4 jx3dyv 4*fsrimary 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 fpi(fxlg 1 4u r6ynf(3lhn) p2transformer causes 14 A to flow in the secondary. Hopx(26nin(u1l)rfyf3 hfp 4gl w 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 110 yx 8b :p49cnei5hvc s+-uf2wg-V primary if the 24-V secondc5w8:ph f y u+b4g-vn 2s9xiceary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and 7pthcyb 6-d;j )z*wjya 2000-turn secondary coil. Itj7 wdp;j bhcz-*yy6)f the current in 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 in the primary ogs mepv c)8p6;f a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secm6c; g pesp8)vondary?

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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.b:,kd4 8 xqhua The primary coil operates on 120 V. What does the primary drq x4,:d8u hkbaaw?

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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 primaryy hj6d l5.,q)eh ggqn6 coil and 300 turns on its secondary coil. If 120 V at 2.0 A is appeh,.6ygq)nhj65qd lglied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil anyg * t kw33y6p5phctvcj:3h0id 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is prese6c3th j3p5ypvw:cyi* h 3tg0knt 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 /d y,osmg).dg secondary has 200 turns. If the input current at the primary is 100 A, we can expe ,mggd.osdy)/ct 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 se:r4 j(lrivdqa1vqe nvf-.3 m 0condary has 200 turns. If the input voltage to the primary is 100 Vd vvra q.f01mn3ve4r i(-:jlq , 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 e ja2+d.fs7 aoits secondary has 200 turns. If the powej2a +dsoaf.e 7r 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 A of current at 120 V. The v132f*k hd gaewoltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total res*21g aw3 fkedhistance 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 v011zabynra-sy97c dmv(pfa-k,2xp en6 rl z:oltage is usually stepped up to 4500 V by a transformer 1m - r7kaa0n(vl21 -b enzf9rdsxp,yczpy:6 a 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 bdqa8d+ v a 2(s;5rkkzvoltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find d(avkr b 5s+;28q dakzthe 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 loyi9 9l9ya kz r atw5;1afcu1n9ng 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 t u a 5lfy1nwyia 19ct9rk9za9;he 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 resistance of 0.60 W. A generafq+gkk 0 q1pup,5x tl8e /qar.tor 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 agrx/q510t,8kel. ppq u+ qfk a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How mudlqd- )9 qd; mj3givx1ch less power would be lost if the power were tdx 9)qjdig3q- 1 ;mldvransmitted 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. It is1noe b jlx/d6tlx n27v+;rc6r to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up +7 lxrc /;etb6jnl1xor2 6dvn with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in+c9f h 3y zqs(pg klqu4r**e8dps0gt8 the coils s4* t egkrg38dhqy90+8qfu(zlpp* c'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 64od-o0ho/bv:q-u b4h;5phj hr e y -l, mjbk2i.0-W resistor and an 18-H inductor. What is this circuit's time constant 4 h o; o-5e-pbqbou/j-,db2i:h yl0jmvhhk4r?

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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 thestpg4mt6;j89wc6 d(1rqmddt 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 pea0 hv( 3d7gaebhk 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 intow6wo8eka d) 8w a 120-V AC outlet. What is the resistance of the lamp? w8)8w6dakowe

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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. What is -,zadvslk95l the peak currenzld,aks- 95 vlt through 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 supp fq5srkn/;v 4b4gnlk*ly. What is the power dissipated in the 4 qkgs 4rnl/*5nkfb;vresistor?

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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 s 0dek4t kd8 1.kgvuo750-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50*tuz pzygb7:-6te ,am-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistz/ 219qzrv bs6sb*jozor 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-j q*6llhq -0hflf m15qmH 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 inductivh;s8 b-nkpuz 3hc t0wf:p+9t patn/( ie reactance of 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 hbcun 0p ,zmh d9y(w:514.0-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 reacjhw7 ; *yzxk6f m *y7uamcl8x9t7:u mjtance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequeb2q whc,sp4f8ncy of 20 kHz is applied t b8h4qw,2f cpso 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-mf9 b;zmqj( jg9H 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 xt3u6f s*87p/s rze7 j,-hwu gsohnk9 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 ixbc: 1.t*jhg5+ *iumqj bregwx,z).li +0xr at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 120rb/kk( w5bw9 iwip1) u0 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 t,. mhh qw:q+* lgg(f-nbl2bhe:h- m arhe capacitive reactance of a 0.010-mF capacitor be 100 Wq-hb,.fn: ha(rg lwh*qlgbh-2+e m:m ?

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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 capacay hn9e ,+mjwt1) s,pl4opsv.itor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W re;ml9k zwqe*9p7gb t7zsistance, 15.0 W inductiveklqm9p tzzb;79gw *7e reactance, 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 coil, and 1.o l0s0fj(hwad(f 0 )bx0-mF capacxfwj0l)da s( 0h0(bfo itor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resi* 6k ( gss74qwrs/,4sax) v*7pbm ns tdi(vrfestor, 20-mH coil, and 1.0-mF cpis /gx(,km6ssv) bs**a(dt qwf7e4 n rv47rsapacitor 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 isnqdp0k w )w6t0 connected in series with a 20-mH inductor, what is the impedance an060 qd w)wtkpt 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 8 4rdm e9*zpgjwith a 20-mH inductor, what is the phase angle at 1*r9pe 4z 8jdmg000 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 2 *cfj+ )pe 2ovixq4e+a0-mH coil and 1.0-mF capacitor for a total impxjio4) *pqae2 c+vef +edance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacizpus qq2 c,v08tances is needed in series with a 100-W resistor and 15-mH coil sq,zc 2pv0qu8to 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 wi6wzfr+. ndjr) th a 450-mH inductor at 5000 Hz for a total impedannwz.+)j drf r6ce 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 vl+ n,c)a oi7v-1mcmltotal imp)+vllmc-i v,1c7namo edance 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.zh2fv:jk0-jg 1 (nrcr What is the impedance at 1000 H k1-jrj:hgv2zc0n r(f z?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF cs:eyaqx 4iv5(3oj c-x apacitor at 1.0 kHz for a total impedance of 45 ix 3jo ye4aq-:(s5x cvW?

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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 p/b5)dekfvj e: x8ze 2uhase a/ez x2kb)8efdv j:ue5ngle 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 neededsrn 4v1)v:l; oqd4w,kimen9h in series with a 30-W resistor at 1.0 kHz for a total impedance of 4v n,qkm oe)ndr4l91 ihw:;v4s5 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. ,h;z3g: v 5ygc dc(mhtWhat is the phase angvm:,z h th; 3gdg5y(ccle?

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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 1 05hlqz)ik3 of00-W resistor, 20-mH coil, and 1.03l 50ozfqhi)k-mF capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit /h f s4+dq,ykaconsists of a 100-W 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 thkf s/y4qh+d ,ae 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 capacitn5n:pur9sl2kkto+rdybe 93pm7g a: -or of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are codpna-:srp2y3r99:+ u t5gm eo lbknk7 nnected 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 an,qkx 1xl-2r63c6g hd-qyp l khgle for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-Hqh32rx,6 kxk p -g 1qyd6lch-l inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resisto 4ub;l6 laq*zvr for a phase angle of zblqal*4v ;u6$40^{\circ}$ 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 *8mv6rb 9hy ct= 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maxim6rvt *bhm 8cy9um 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 b imklwf 9f1:9W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, wm9k9fi l:fb1w hen the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuitooz m,,b/9f)ko hy pmk79e ;ut 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. Whatlj)3zlim f eq5t6tl .) is the powqflt)j6)z l.i 5ml3et er factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W resistor, x5jwo+ 6sw 1qoa 10-mF osjx+o1w5 wq6 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 ca9cq a*kbndr2py6te9-m24uii pacitor and a 15-mH coil in series?4b26m2pn9ar *ik e d 9ci-yuqt

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resonant bhs76-d/hm n nfrequency of 10 kHn 76-s/nb dmhhz?

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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 resonant frequto h4i,h05nqk-4t 6h x,i6; vynh 3x mrywtno4enc43tnwxqk6 h,o ynhiovy-4hnti tx5; r0h m 4,6y 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 icu:.j 84cvnp+- sbtaand a 40-mH coil if the resonant frequency of the circuit t.cv4+ 8nu:cspai-j bis to be 1000 Hz?

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