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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 magnea-ln 2,s/jd oagt z/h1tic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction stakgnrsm+if+.6x-hl x8 tes 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 produces whatu1t 1*r xiyxh6 kind of change on the in yihxur*t x161duced $emf$, 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 fieldmt s (3fwiqfpy+a2 hmlc*ra6 jg75r6wl6hn5: through a loop of wire produces what kind of changn r3wl5+y(m66 :r7plh5* twhs6qfiajm cga2 fe 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 loop of wire produces what ki9wv1d( 5 et(1vufc6f ksqpq9 nnd of change on the inducf1 p 919csfqt6 qe5dvnvk(w(ued $emf$, 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 frocvygsb .9t 5vw- w;zf7lbh,5sm a magnetic 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 d a+:i/ztqmi7will be that which tends to produce which of the following iq 7mazit/:d+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 bafxoqie4)x0h 1 o,5dkq z7.mpw r magnet is held above its center wx1x.khzoo4iwd m,fq5eq0 7)p ith 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 t5/v uli0vf+xl+a n yzdc456niable. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induce6fyv+ x5 vu0a4n n5i zi/lcl+ds (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 tkex d /w,x;00u1 ;p)vmqtyva yable top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is t0)ev1w ;k/xm0y, uyqap;vd x 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 fieh.apn 3mh9:uhld vector points straight up. The magnetic field suddenly grows stronger. When viewed from abh ah:n.phu39 move, 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 topec6s2 yh,l d-m 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 cm-s,de hc2l6y urrent in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasing iwcb3-sg+;lu 0hbf1 z current no f0 l3gh+;-bucszbiw1rthward. 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 pole entering first. :.si:imbljoxxdvg / ;q2wqs+ q8ws7 : As the north pole enters the wire, the induced current will be (as viewed from a:./s2: osbw v sm;7x:iig+qjwq 8xlq dbove)

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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 abm-z 1wmpa0r y7out 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 of0zm1r7 ayp -wm 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 consta6j 7cazfusdomen l.p)+7x - *fnt 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 orientatml6uep+ fz-cdn j.) of7 xs*7aion 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.t4 26uw mlva7z0pcx p9
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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 t:, u+2r tibf)p+b5k -zerhnqthat 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 ax . ovb4aj )vh6n*o(nc 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 direct*( v0a+jthga7+w wstmion) is moved northward at constant velocity through a magnetic field that points straightmg7(0+vh*w j at+was t 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 vtb bl+sba/dz out2w-el42gy4m2)7dconstant 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 trak7fm g:es 7s .ch7x)mvnsforms

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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 secondd w-qjt )5ier2n7q ephief-75. The frequency of the 2jdp77iwt-n f)qh ie 5r-eq 5e$emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used t ,a brw.w(swv;o

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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 the fax+xr s1/8mat

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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 sxe,h+ w6.j u+(fiovftecondary coil contains more loops than the primary coil thenf, e (vhwo +.+i6jufxt 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 thu 6d9+ p6)qhlhvzkoi/ e secondary coil thd)/ ulk6zoi vh9+ph 6qen it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the 5k x)pjsc*wte.c vr6e c7,0la 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 resonant circui+-bbv/i r fm(pt,

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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 sq- (b679wan :pfrwt60z sxfoveries to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistor 6vw :6x(bqzn907r ofpsfta-wis

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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 cmwb, krdaz8zaq)/ u+8onnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the vol/z,az)8 drqka uw b8+mtage 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 wutap/pwu4(* L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductanvi, ek8uvx-7 zce 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 batte w e++od.,3skzydxo f9 z1+lxary. The time constant for the circuit represents the time required for the clyxdf31+d, zw+z sa+ookex9 .urrent 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. The bat7a.(h*3k z z8or7fb nbds hp37(x)sgv ;dka mttery is suddenly removed from the circuit. The time constant for of the cirsb8r3f(s7v3n.( *x k;7m hb7aod gpthzzk) a dcuit 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 h c fmi0 t9:.atwr0 ,mvobqrc3-ave the 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 connected to an AC power supply. On this circuit, the currearh/d )do 40:.mv fml(s 8rxuhzk u:n.nt

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this ciy/py.4pp3ltznvmz b 50 5w6fjrcuit, the curren .p64wpy3njv5mf/t y b0lzpz5t

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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 circuitkh pc -f ek-9;dt1mw.s changes by what factor when the frequency is tripl;sm -1.-p w fhdket9kced?

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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 inductorteq 4,,4pe-:yf-y h jclgehm 8 is doubled, the inductive reactance of4eqe8 f,yypt-j: hglhme- ,c4 that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, t sjy* dlx9tb;/he inducti ;lsx *tyb9/jdve 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 cox.ur9 8 s.5xgvrp xo5.:jsfa:l (fbprnnected to an AC power supply. In this circuit, the curres.( r urox.s95gjpv fbal8:5: xrp.fx nt

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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 akw0g6 g ,2 sf:j dplr)g7y 9d,l3r 1ksafomn)qn ac circuit changes by what factor when the frequencfrrld 97gpk)w, ynds fm1o6s 3,j alg0:2 kgq)y 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 ze:u49 gmy;+ngumo8um y*a fnv67w :d 01usmovmro, the capacitgmv+9o0:1 nmm u;wf g*6 yyvusu8m4o na :dum7ive 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 voltages of the inductor and capacityx ;k(d +4wr/hus1y lmor in a RL4w1sud yx/+(h y rkml;C 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 b7wicg9b 1 l 8p6xxn5uRLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance oft8wcn o/y 0k1dx(ddi)c3b . us the circuit increases if R increases. When is thiso)bcd/13td8(xwd.yn0 scki u 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. Thetl( ic.jtbw51rw ehdws fwv;g6 ,x5/. impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of pf7hbxf rq+* e-b:z* jthe 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 an5gn1nrg bkw 86d the capacitance both double in an LRC series circuit, the resonant frequency of n 8k1grbgnw6 5that 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 AC3c7v51 3t ./rkznvd2 .lwxhcx8hebf z 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 k1 mu br0scn:(5o rg3v9 (askyRLC circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform mrx;1 aipm33li agnetic field of 0.20 T. Find the magnetic flux throxp;r3iam1 3il ugh 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 i;+b 0mjn)j dy2,cdglt n a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop atly0)2; ndgc+j djbm ,nd 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 rotatiai p0o1: )qhxzng in a uniform magnetic field of 0.20 T. Find the a)1o:0px hzqi magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced frowwli q2d3 ;/fcm $1.0 \; m^{2}$ 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 cha*o9dc,f6ui8 jutbfv :nges 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 squa cm dvcd85)+rsom6ro i i8-9hjcn7+aqre frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the 5 v-98c++r 6rdmmicnac)soq 7i8jhdo 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 q-oi7xuz8l+x 0 5iggniok4 0 marea 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 .it m f7mmsp/)/s6xsz and 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 lyrtbaw+nk 2k3 6 u(d*h23pnhjsxx e24ocation where the downward component of the Eart+ut2w324jnrx2ykkaxns 6 de*p (hb h 3h's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constantrx8jcak).n + ,gjw-wo angular velocity of 2.0 ) xwck.j oj,n8-+garwrad/s about a vertical 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 has 50 loops and a cross-sec*ps *o.c iut*bdqtea;zfu/;t xd6*)m9)pi pgtional 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 wire of f:ua+v1 mvfr 68fit2 jarea $0.090 \; m^{2}$ 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 armature. Each loop is -no7grn i 9tg912 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side.-n 79gigt 9ron 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 consittbrt d+q tk,jp1* 0rc*kh +qd8g+ qh2sts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced 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 tygg;v7rn w56i.ahs v x69depf s:x-(an output of 12 V maximum when rotated at 60 Hz. A magnetic fieyt 9g6 axe5p-rhnss7.6vgd(fv ; :xw ild of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maxyzt s,1dt,i( jimum $emf$ 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 rbz .mw17:w89ww*acibs0m5wt 8 lsznj esistance 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 1izs 2:7-nekwr gwj*gresistance of 6.00 W. The motor operates on 120 V AC, and when running at full -re:*1 k gzs njgw72wispeed 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 supply. 0hoivr9 3lw) wotf-6kxr(q; tj t:if(The operating current is 1.0 A. What is the strt0:ivw3t 9 fk-ltr)h6j fwoxq;( (oiart-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 internal2oanmaa /hsbxak9lw5+ gi3s+4 9 f: re resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. Whata4: ws9alxk2 h+ sai95g amfnb+e /ro3 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 powecp2ah/u-i.e i)t1whjr.+ 9jchz, vxer supply. The operating current is 1.0 A at full speed. Whee cw-,j) jxuh.v t prhahi.9czi+21/at 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 transformj rsoul 08ly3a y00ch*er is needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primal*yy r +whh,k1ry of a transformer causes 14 A to flow in the secondary. How many turns are in the seco* ywkh1l y,hr+ndary?

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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 necesea8y jmaljd /44k.n,;cd5y fr sary in a 110-V primary if the 24-V secondary has 100 turnsf4ynm;k. ay5r/4 l 8,ec jdajd?

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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 coilo 70c p6 yom ngclp6t:g9f l1ve3bj2l7 and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what l6np1g6cybo7 f3p 7: j2m0g te9 lvclois 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% efficiency5af+/7k eua7x dxiq0 o, how many amps at 24 V can flow in the secondaraex oadix+fkq7 50u7/y?

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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 vn*qo9f +;qkf a neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does nqvq+ 9ofk*;fthe 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 its seuz pk2qccpv e/.5j8 5wcondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is pr 5c.jpek8z5cvupq2 / wesent in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its selmc9ywfozq0 0/f/xk ;condary coil. If 120 V at 2.0 A is applied to the primary, whatxf kqo f0m y0/l;z/cw9 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 itehscp nkw2o-, : +fvgz048/r:qzrmhts secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondary tm-p2 h:0n4ok v/er,z8h:gsfwr qc z+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 h+pz cd75 ojw bzhf4emv5ep:bk:9 ia ;cxo5/+zas 100 turns and its secondary has 200 turns. If the input voltage/z5cz5o: k emezvd+7;j9o: hf xp4b+bw5icpa to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and2bfjruk )j-8e its secondary has 200 turns. If the power input to the primary is 10e8k j) 2-jufrb0 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 curu(kim .g3mwh7b 1j* ycrent 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. Find the number of turns in the secondary if thehy(3 u*m.jmkc 7 wgib1 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 1 w :na hg:z4q0admafimk3 98-a.fbff 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. Find the percentage power lost in the transmission line.a9 :f1-n : h8w aiffzdq g4a3fkmm.ba0

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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--of puag;v(9hj q5n y. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.5pj(a ;nf9qu -o-vhy g0 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 reb6m 50,kraxz.j4hhy,ei duufi 0d6y . sistance 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 step,ha dmxuz0 i40yji. h6 fb k.e6y5rdu,ped 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 km3gat *x+x4 zhn long has a total resistance of 0.60 W. A generator produces 10t x4g nx+zah3*0 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the 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. Hc*lmm + iz91yoow much less power would be lo*cl+y o9miz m1st if the power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a li-9zj7u:) moaqbm9pm y f9wyh;x5kl -zne 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.hp lm- zq99mmj)w x :;ou kbz-75yf9ya010% 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 sksj2 tq gr(:/9j :2bw33zjo agalfm9ltored in the coil's magnetic : 3gjal3:btsakq/ g99(jozw 22 jflr mfield?

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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 resisti19dfdie,o lvp6u6a ) or and an 18-H inductor. What is this ,if d)1iv6du9le a po6circuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit whe q:l2 mq4umxm+re 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 int9n31vh82bc jn5clk oao a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outleq 2ousu/id+q7 .4uujc.ga7fqt. What is the resistance of the lam 4 .ua.s ugq+cj/ du7ouqfq72ip?

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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 dg( g c1;xkgr cwf1dmre,;8 r:supply. What is the peak current through the gmcrg kcf e1;1;gr(d 8,wr:xd 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 120c ;e (zw0d8 hn 3d2ebdm(y*9larh 3pmn-V ac power supply. What is the power dissipat dz e903c8yarn(m(bmddl;2h3 npe h*wed in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through qn 4wh-xoh 94ea 50-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-W resibhwe g)sfs 01(;irtf(stor 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 kd 6zhuc;jn)d (ha/n ;z m)a)qa 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 reactanceha 2j8r:bxz*s 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 rwm98k*0 vlt epe 3 k6m.qec4ydeactance 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 ml9s p ;s4k04 r12rvjcpd ud9pW 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 n:jpe+ fwy38yw ecessary for 157 W of inductive 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-mH inductor when 120 u k tj(uzi)).on+yi5gV AC at a frequency of 20 kHz is applied to it?k oijznug+u5)iy).(t

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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 throu5fvw u-h)tk6a gh a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacito foj9tylel04 te +)6yr;n/dhpr 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 neede)1gp2zu*l 1 p dsab5okd 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 reactance of f1ibk4 5u eph8(9(ck zz-nwxm1200 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 4:-herfha0s-de pw*;obvo i9 a 0.010-mF capacitor be 100 W0foirh ;vsw -4a 9*e p-odb:he?

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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 Hz and 5.ov g7jhw3:)n/6on3a8e 9 s6a fuwmk cr0 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 resistance, -k 9/obj ct89tawm mej037qz,7yj nhx15.0 W inductive reactance, and 10.0 W o t m97073maz ken-h8yctjjwq9/xjb, 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 4 zi2ar2aleg,:isuiyyw,8 r 7fq5-jwa 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?,u4ia8j,-a f2iryw: ewg5qi7rs 2l z y

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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-srksr -efc82k7cy39ky l4uc+ W resistor, 20-mH coil, and 1.0-mF capacitor are connected in s e3yks94ykc8lk-cr +s2cfr u7eries?

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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, wh ,+7arjwa;izd 7a2wj 4;pzgk lat is the imped;,+a p w774;r ajkzjliwda gz2ance 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 connec2jkom fnsv o6*b: 32hhted in series with a 20-mH inductor, what is the phase angle at2mvs b6oj* n23fokh:h 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 circuit wdkabz.wq(5 4 pith a 20-mH coil and 1.0-mF capacitor for a tota(4k aw zbq.5pdl 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 following cx ng58o r g5qitss4qg/q ihfo 1+rz77-i1hk;rapacitances is needed in series with a 100-W resistor and 15-mH coil to get a total imphitk+ ;o15fn g r/-o5gg7ss i7 hri84qzqq1rxedance 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 dqbn ,myn;*.h series with a 450-mH inductor at 5000 Hz for a total im.d,y;nmqnh b*pedance 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 au nkc h03+,p+d +olybx 100-kW resistor at 1.0-MHz for a total impedance of 150 kW?ldc+n o 0uhky3 xpb+,+

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is th xwkwq6;)wzki8u e6r*e impedance arq6zkxi;*6k8wu eww )t 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed il:s -6 +xsuzja*jxdhl)qt0 ,tn series with a 10-mF capacitor at 1.0 kHz for a total impedancej-0ht6z+s qlxsuxl) a, :d* tj of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a phasug0 q-*x0orza8jts5f e*g8futaz5s 0 jo0- qrx angle 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 neov 37cveo572f0ekxk xeded in series with a 30-W resistor at 1.0 kHz for a total impedave5 ecvxoxk377 2ko0fnce of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in bihy g7q,yg5av y09g,series with a 100-mF capacitor at 120 Hz. What is the phase ang yq,7 y5giy9gvgbh0, ale?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, pqicc0 71nhek-r )+za :xxyx720-mH coil, and 1.0-mF caai +xp 0 -7y:h7cxn xqc1e)krzpacitor 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 consists of a 100-W resistor, ,koq has(b.pqau6qt75(g(d;bz x d dh9i;ao3 a 10.0-mF capacitor, and a 0.t;a9a(a7x(o;did q hq(kpob 6. 5uhsd3z,q gb 350-H inductor. 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 )y,eq63t ses6o/js oereactance 30 W, and an inductor of inductive reactance 30 W are connected)/qes yt6e3seso, jo 6 in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W rwij zmzoj9x ;,tt./m*esistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a o; /w i.zmt9,xmjt j*z60-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 i,n6h7 hzt qz7fqmd hc2jl515 a 500-W resistor for a phase angle oi5qz7 t7d q5mlzf hch62n hj1,f $40^{\circ}$ 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 = 2jpka+ 5aco km/f)u8 ckw6 z:7i00-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the wfk6ko5)7ca 8p +auzmjic k:/ 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, aw95ns 7hx b 0irhm;wl 3+*wva15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit 9bh iawv l7w*3h5 wanmxr;0s+ 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 c3,-q4 hx.+c7ecz ow7mey dmbwircuit 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. Whatv vlxxw6hgb) 9n38;ol isl8 3bl)9woxhv;x vgn6 the power 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, a t o /.8czl( cpl5wxrxq9 lj9j:10-mF capacitor, and a 0.45-H inwpljx (c.l9 c t:x8/lz95o qrjductor, 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 f y)d7awaxgg/zsf . ,dn*w0b4g( yz*bprequency of a 1.0-mF capacitor and a 15-mH coil in series?(z7.ag)* sgg ay0bf y,4z*wd xdw p/nb

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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 wig1ze k,*:grz rth a 4.7-mF capacitor for a resonant frequenc:g1 k,g zerzr*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 inductoo34x3jbli9 lpzwk k:cu u 2+j6r for a resonant freque zcj2ik6ub3kj3l9 p:owxl+4 uncy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-mH c5;qfo9a- i g;:upnvykoil if the resonant frequency of the circuit is to be ;g-o 5vpu;9 n:iqyk af1000 Hz?

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