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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 h* h8xdvtpd)3 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 indu-f 7/rbye4z piys(s w*d++jstction 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 wirerjq;* ebv4;qi l sx id9+zayz66f c.s0 in a coil produces what kind of change on thei;0y*9f.eq dzasb+64rlj q6ci vx; s z induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strengthw3wr;(cj )9 y t;x--clkjau fi of the magnetic field through a loop of wire produces what kind of chycf(w;ki x3j;t aj --w9)lrc uange on 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 loop8 sbe.6 n+qc g6i8:qbles) dff of wire produces what kind of change on the induced +q)i8 efe.nfdb ss6 c:gq6b8l$emf$, 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 field an x fwvx;+fz8. ma wr;vx1b 18ru$emf$ 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 p-tw8vr, vm vuj02b6q an induced current in a conductor will be that which tends to produce which of the followingtqmjrv u2,vp0w bv-6 8 effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is yci fiod.+p(0 -7djdr held above its centerj.ryd io-0(d+fipcd 7 with 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 tablekgx m-hi,vh9 uj,,6(x 3q +vhvrfm;nf. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewe6-,, ;qjxvfinmh9mr g v(kh +hfu,x v3d 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 tablefh;js9 f9)6p nvwz: pexcf11o top in a region where the magnetic field vector points straight up. The magnetic field vanishepz ;shjc19):fvpxew 1 69fnofs suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level .yjl:xz6-snol*.u js table top in a region where the magnetic field vector points straight up. The magnetic field sj:*zxl6s - .njuloys.uddenly 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 horizontal table top in a region where the mad2zn(pgqy1,p nfp 7a0gnetic field points straight down. The magnetic field disappeazpa2p,p (0y7dn fq ng1rs 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 ll4e,m8 xf z(hwies on a horizontal table and carries an ever-increasing cur8(e f lm,4xzhwrent northward. Two coils 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 north poim0.x nilxw +zq*7 9:tq+he wsle entering first. As the nortw qht n*wz:+ mie0.xli+x7s9qh 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 rothbgsdw 9lye6 2jq7 (1cated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loolesg 9 d67(q2whjy b1cp's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at consu; ltcs6to ua7 /lp*.6fa2tog tant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if t27*u;tuf/p6l a atlo6 goc.sthe 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.d4c9;jr )bt8c fdlx, p ,fcdt4w4z; ue
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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 j b5shn-,mx k5that an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field.)b y/ czvd*3 w03lak*cfrrxi 4 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 (oriente* elm8-e*got00e k k rwiem9d+d in the east-west direction) is moved northward at constant velocity through a magnetic fiele 8geok-m9*+dmr*0 l t e0kwied 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 constant aniwf*gq8u(4qx gular 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 transfug0m15ic5 tp0g qxnk rq6 i *l 7lognj1(5nq2xorms

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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 frequency of-d 1brjf;i6w(p -nad s th da(np6-wfj d rs;-b1ie $emf$ 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 us6gfl5+b xt gvkc/ *7kyxch/2ged 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 devi1c, 1luh x8jnece 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 sifmv5 .relf 2-wlz lc,jj1,6 the primary coil f,cv,wi6 1l ll.z-2mf sje5j rthen 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 than the secondary.sbi9h 8:fhf3 k8ty ik coilfbki3t:8sk hi9.h f 8y then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, thed g68waepikqa 9r5v 1) power 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 resonan7u.xwz/ jtt /k yyw-,wt circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an iwt 9sm yanfb1zy )3:0 :dmdkxz8+ef;h deal battery of constandzdtw )z3bxs:k;0nf8m9+mey :1hfay t terminal 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 in ser3of3 wa gwesgz +sx8,8ies to an ideal battery of constant terminal voltagexfg ,wgz8 s8 a33o+wse. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance 0w wosr o,:q3yR 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 inducteent;gpb72 k3y26m w bance 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 zvq*uc pl,+wd9 ) 8)kc yfnym;are connected in series to a battery. The time constant for the circuit represents the time lpyc) )k8 n +;ucdf,mqv*w9 zyrequired for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. xp 1n i5w 8sl 6nvi)5outht+v6The battery is suddenly remhvws+tuv18p 5 o 6l)5nti i6xnoved from the circuit. The time constant 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 same units exd6r)4 2otzbuy(k lc-icept:

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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 current*w8 a.y1ahzyx zn8 w2l exooo wb3c)9.

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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 powo uze pygf1//+11 gyg x pvx-di.td1q1er supply. In this circuit, the currentdg1fx it/.-z p q vepyx+ogg111uy1 /d

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when6ibztssr, ntg7 yx6a- x5*u)o the frequency is tripled?ito6)*xs6g7snr ,ty-5xb uz a

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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 acr,3r37 whyvza 31wvqsross an inductor is doubled, the inductive r1 wry hv7a3,v3rzswq3 eactance 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 approw 5t;wq.e tnk6aches zero, the inductive reactance of that coil6en; .5ttwwk q

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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 c uz3xohupp,/*b k r5j;onnected to an AC power supply. In this circuit, the curren5pbo jx /uk*u,3rh;z pt

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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 changessj 7zb-)jnrjju4 zy.phcl)7. by what factor when the frequen7juzjslh - c y4rjjpb7)..)nzcy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the c+n. 7gvrtzv5tkt exg+.g x-(6 +lmnoiapacitit6 +(-+7xir5kn x e.vz gg.t+nlogmt vve reactance 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 vonk/:, c6wrlf nltages of the inductor and capacitor in a RLrn nl:cwf/ ,6kC series 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 RLC circuit is defined as 5j tt0u-x-yk.vh :kb g$\cos M = R/Z$, 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 i4hj3jdpw-vxw.29 w: wu ciz4 t +spun-mpedance of the circuit increases if R increases. When is this statement trudwz 4puj + n42tjp-xwvwi9 h:-c 3w.sue?

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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 incxmn9c16 zwpjs,f+u l ok+us)(reases 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 ciru46hfn0 g/(utpi9 gr0jjyq8 m cuit 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 cl/zrz, ft4o /qapacitance both double in an LRC series circuit, the resonant frequency of thalfzt/o4q/zr, t 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 vu me (.m-( -xqinrcae2oltage. 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 occ9h j.-lnxc+ (;ubad91rrg k+y vat 4jiurs 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 ly 3az-5(mw qii;m6ppe6y *njmagnetic field of 0.20 T. Find the magnetic flux througli zp-( qymjp 63naym6iw5e *;h the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform m-9tham* 6ug9 ,ddqt3w0(m nbyka0/ultln6j n agnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magneti6und3( dl k/hn0* 0,mg-jm t9nua y9btql6tawc 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 ra 9 da)t(o(rchfdius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux thrta c 9hr)dfo((ough 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- eja,5z5nbax uwxs47 single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil chang -ajkyuyd93 g6es 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 squarea;q;sf xuxr01w6s v86rzzr 0 o frame with sides 18 cm. A uniform magnetic field is applied perpendicular t;xsorz;1 r006zvsqxra uwf86 o the 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 and an area of k5 (7+kjy hzmr3at xo9$0.40 \; m^{2}$ 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 area gc -doj.33n:wxwmk2 g$0.20 \; m^{2}$ 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+hf9sg8 b)n; 0tyduta m flies horizontally at a location where the downward component of the Ear)na t+usfy; b9hdg8t0th'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 rocje t1 )4 jk:1erz3nhatates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magneti)e jnczk1ja 4eth:3r1c 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 c/h/ +ju)bkudjjs(b 6kross-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 os,)lxnrhy-k b7 k1u 0da+g8q kqfc v-7f 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 qgr;9 8 d9sbsgarmature. Each loop is 12 cm long and 8 cm wide. The gssbq;99g 8rd armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the 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 wird*j kab le,i+*e of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with/fucni4h,8xga e36ldf0m. nw 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 rotatinf 0, 43dn6guah.x/e cmn ifw8lg coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maximum *u-gp/r,v, ck kloy0e $emf$ 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 ona s ru7.s6vd u3kb52motor 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. rzb4o, /8vhv2u za2 egThe motor operates on 120 V AC, and when running at ouhzzveva, 8/24 b2grfull 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.k. zxxk51r8; dyra1pk 0 W is connected to a 24-V power supply. The ope.;dk8kp511kzax yrr xrating 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( z*7dx jd(qvv W is connected to a 24-V power supply. The operating current is 1.0 A at full speed.vjd* (vq7(xz d What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to m vipu5r;cp .;+ qsh3ua 24-V power supply. The operating current v3qph.r uucmi 5p;; +sis 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 primary. ug+;o80e gpzwcs3ceer;fwg+sdg.5 voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flvaiy dq9l qb p6uyy3z:jt/074ow in the secondary. How many turns are in the secondary? /u4zy v396d0ilt y:pjq7yqb a

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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 necessar*i.czq wjx +f:bqe(n-y in a 110-V primary if the 24-V secondary has 10b-.+*(izw:e cxnjq q f0 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 cgkajs ,sui 2s6b 121v t/mvp(secondary coil. If the current in the secondary isvj su(/2pg 2vkc1am1 6st b,si 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 of a /:y:c1hxr otvairr6 +a) ii,htransformer. Assuming 100% efficiency, how many amps at 24 V c hh)rva+o ryx r1::/ic, aiti6an 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 neoge me*(j(t74j0malt rrn d5a zdsato:5t+ u., n sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. 5+ .z*agu ejted,rao7lt(r5t(4 dnm0stm j: aWhat 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 3w73d o,u sft+z00 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in d+t3f7o uw z,sthe 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 ):afi/dyojx 2b*4 k /8t tjffuhas 60 turns on its primary coil and 300 turns on its secondary coil.t)i :k/ ffjoftay/j248u*b xd 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 turo 1zo4nq v-:vlns. If the input current at the primary inlvo4 v o:q-1zs 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 turn,:4kx3 j n7xnmhs29mml5f vsss and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the seco7 m :f2 ,lvks39sx5 x4mnjhnsmndary 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 an2 :s4xk mpgt +ejvo(u p:y8)kgd its secondary has 200 turns. If the power input to the primary is 100 Wgg2:y 4ekpvxp:soktj m(8u)+, 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 voltage is usually st6(h s,nmhfr:fmm i+ v2epped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in t:6,fmhsn(hf+vm2ir m he 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 voltage is usually stepped ucx.*gu 2:bh upp t.: 2c*hx pubugo 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is uist(k9da8c o 8 6fl;h**okmao sually stepped up to 4500 V by a transformer and transmitted through a power line of totf69; ho*8*8lia moa(k ktdso cal 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 total resi.lug9;u ewy ) yd)jk6estance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the trangye6w ;u ulejyd9).k)smission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total rpc.dzr84 y i)jesistance 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 c 8p4zrj .)iydis stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less j.j vlp1g7 j)hpower would be lost if the power were transmitted at 3jhg. p1lj)vj 7000 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 is to be transmittf9*n+-pzg.gs g tpmp/ed on a line with resistance pzfp/9n+tgg* s.mpg- 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 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 currrstqv0mz 7 ;-kho/fx5 ent of 5.0 A. How much energy is stored in the coil's magnetic 5-kfq0xt7rvos h;mz/ 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 thi6buur) h +cm:fmy ;d5ss circuit's time consy)c urd 65b u;hfm+:mstant?

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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 circuu ):uaf2gq(lo1gtzt i+84 goqit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What i-fxm0zu5 q)*1li 5ddhxhtz i,s 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 120-6/gvmhbaj * i obws37:y3-ik oV AC outlet. What is the resistance of the lamp o kb*s7/a:j3b-wo6i3 hm gvyi?

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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. Wh7ia5n dbiy (xn 6h/ys)at is the peak current through theynhsbdi/(5ai 7y n)x6 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 cofaa7 j d: i,qzsje;(q-nnected to a 120-V ac power supply. What is the power dissipated in the resisdz;s(qe -a7q: iajf,jtor?

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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 resistog50 6twe8qqo+-i tc oqr 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 resist tndw-((ml oyhf11k h9or 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 aw;(p tqyw4 qyw.ej (/1hf xw8m 50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactancecf spz, z34a3thjt+p 0 of a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactan -6ue*rgcut n2a09rgl ce 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 14.0-mH coil have 14.0 W of inductivm -umbr1 1:wsjx3 6vmiyv k1)oibje8.e 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 reactance at 1t(4wmbui+h po6w +ihckp46r )000 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 orggy ;o+fgw y4 35k5-f tc,0xcrez7dat a frequency of 20 kHz is applied cgx fgt koz70fd,5r w4ygoe;5y3-r+cto 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 acnzn xi5g 6w., 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 capacit u41vqi7x*6+zmh s vp wvy8zx3or 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 toha qre,g:rvq.c ja .7of;q )-a 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 rxx0ht ;lt 83fn cpg3f4 pj;7kzeactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capaw c7z3xnf48 aicitor be 100 W?48xwaf7n i c3z

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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 +*w*eyt*vw4v qfz) zv1000 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 resilunmc rn tuub arwu.1 7oi04,c5ws//)stance, 15.0 W inductive reactance, .cr rw,u/bw )ia0lnu sun 4 tu75oc1m/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 resistor7:refhaw 6rf:, 20-mH coil, and 1.0-mF capacie7frafr :w6 h:tor 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 10aa.84a ib,(u y-axbny0-W resistor, 20-mH coil, and 1.0-mF capacitor a 8. y(- aay,a4bbxniuare connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what f c1 imza9w;i* t77zspn;6tjm is the impedance at * cnizmj1 7;sw amt 9zp76ti;f1000 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 wt3 *9aml nnnd3ith a 20-mH inductor, what is the phase ang*n3n9nm3adt lle at 1000 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 :wo(s0d :yg 60 ft6qkrruaq-tcircuit with a 20-mH coil and 1.0-mF capac ysko0dt6:wrf-r0 (tqgq :u 6aitor for a total impedance 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 followinn/)x cj(kzd wconr5za6 j3r./g capacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedanc3 (rk.wn xdjocna5r 6z/j /cz)e 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-m:-8yp2iu ,hiklk crh (/kt7baH inductor at 5000 Hz for a total ta 2k/l87br(cuk y,: ph-iihkimpedance 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-ggnkqb 8z *90zkW resistor at 1.0-MHz for a total impedance of 15 z98ng0b*g qzk0 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-mqd* c:ku,6 llvF capacitor. What is the impedance at 100,6kd uvq cll*:0 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 needegf / cwm+5int th7 i;lw78phz,d in series with a 10-mF capacitor at 1.0 kHz for a total i5h f/7gtwz,m8ni;l c tp 7+whimpedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz g5*ogohe7 a3qu (w/mx for a phase an( 7*mguagowhoe/3 5qx gle 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 30w*i v(e51n vtz-W resistor at 1.0 kHz for a total impedance ofnit1z*e 5v v(w 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF ccq1j+ojv (h19 kv6m cfapacitor at 120 Hz. What is the phacch9( mof v1jj +6q1kvse 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 acb9pt -w vlp :q/5e)rnt 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series? e:5pt 9wb-p)rqnc v/l

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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 ygv((tyi ka e0 ,/xg)ka 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is ke(yvk0ia/t y )g(x,gconnected 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 cap- sxew )tc9w*k3to 6faacitor of capacitive reactance 30 W, and an inductor ofstk owcw693-a t)e*fx inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containf of13p k;/6 22hrntvxol/oaw ing a 50-W resistor, a 10-mF capa/a3 k/1;owrlf n6 pxtho2ov 2fcitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W rex52cto62da0dmg5v pv 06izv osistor for a phase angle of m5z2a56cod2 0 tdpg xv06o vvi$40^{\circ}$ 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 =b6*ki zgqij m0:jx0 d: 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to havjm0 :biz6kg:*0 xijdq e maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15.0 W gg9d 0 2h .cmpt)2eg hwbol)sotb(n0gh h15o1inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V) 1b2(.bsdwmghoeh01hg0to9tl p gnhg5 co)2 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.wht m8y;;2+iickt. wx de9jb 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 resistance of 35eledw 0 g2w(h0 W. What is the power facto0(gw 2lh 5eedwr?

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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 seriesl,7r i og;qmy5sz3zu+ RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a7or5 qsz;ly3,zigm u + 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 resonants.8dvw uq24gib/fu7v frequency of a 1.0-mF capacitor and a 15-mH coil in series?su.7 /diqgvw84bv f2 u

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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 lfdf x9- gz,m*4.7-mF capacitor for a resonant frequencdxfz mg-*9fl ,y 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 with a 3.7-mH inductor for y ; o8(zmbu6qfa resonant frequemb y6uz8;q( ofncy 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 mtj-0.n nus p uon4i;f.6-cynin series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to b6on.nypmj;-n tfcus0 u.i 4n-e 1000 Hz?

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