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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of a z12yo cw+.damagnetic 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; vy2htt a fi4jtz:gi2z ziz/+y62nj; 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 wir4+qunp2 cqu,q e in a coil produces what kind of change on the ipcn+qq u,u42q nduced $emf$, 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 field through a loop of w zqsfqe+8/ u)4swml3 f a3gf3tt/(bxfire produces what kind of change onaf e g//bmxzt+(8w qt4fq)su 333sff l 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 lsavzyb2c r9 6s*1osmgn1 :2oof wire produces what kind of change on the indu:bscyvnsmga2o1*z1r2 9o l 6 sced $emf$, 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 fro st/locy71)v- y s4ezhm 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 ) ).klwn3cm 5j zsrd7nconductor willr 7nmk)3nswl c.)djz5 be that which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. ,e,o(i:kxn)aak* .lplks 5/ax /byj eA bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed fromokaxa/s/pni, k)lye (: ka jx.5* ,elb above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A1svcr u--s2 yc bar magnet is held above its center with its north pole pointing down, and released. As it approachevcs2 su-c1y-r s the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region wherebqa.hb;c/df7-acfk-oy qdb;5vq 8.u the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current ;-du; 8 d.b a kqc.qqo5abf-hv/bcfy 7in 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 tq gs uf-t90wh1op in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the directi09 thqwug-sf1on 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 hdiue839j-atleg +3)vq p f: yworizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the directionqwpi tv9 j33eyl:f u)ged-a8+ of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table sf3 ww3ig(ih2a gj .v i;9yr-ok2wp/tand carries an ever-increasing current northward. Two coils of wire lie flat on the table, j9wi/fp2. k2(i;3vrw i o ywa3hgst g-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 loo 6;wlvdo* vwo(4ry6t bp of wire with the north pole entering first. As the north pole enters the wio*d6;w4vt b row lv(6yre, 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 yrrj-a7rzt z/f- i,vy.,4)kq f: nadkrotated 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 loop's axis of rotation if the induc y f.y) ,az-fa,r4 jirvn:t-/zkqd rk7ed $emf$ 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 cons tf;y+ieo w3d*9l1se stant angular speed about an axis whoseyswit1dese;+f3 ol9 * 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 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. os 2qhei 7,th ajl87-jsvx ,8k7zw-xy
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that 2 n1*rwxzeg4kan $emf$ 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 hyi(ne8 /b8l-2 hl 4mq4ijkfga 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) is5 a00ef6v g:.yxy;gc znvic-o moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential indu5.c :-yyax0g0cfzg ivev n6o; ced 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 hec/9yp7vds rl(+6)er+ f rr fangular 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 twj)k9pr ydyc ;/b4fr0 a ohgz4t:q 88xransforms

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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. Tlfi7vt 57 kvh4he frequency of thetl4fi5kv vh 77 $emf$ 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 devm9.z thoo7 y7qice used 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 thatqibc9 l jyvj;g4 );de/q(c (in

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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,jxov6f/h)ofi.r0 at the primary coil then it is, f)jhr ao0ofv.ti/6x 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 than1z ur89c1ert lsz9 r1f the secondary coil then it is relrzr99zt1 18 ufc1s 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 i4r6ybre t2be f 0s39wrnput

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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 resona j3q f/qluln9ac/,f u0nt 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 otmt+y5 ;e pdh/i+zo q03d*ucf5/ivtideal battery of constant terminal voltage. At the t++/5vd3ioqftcz5/mhuie t*0 ;y pdo 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 series to an ideajnm2r6o 6dbw41a+mq wl battery of constant terminal voltage. At the momentm1+onwb w46aqdmj62 r 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 wita9km 7 5 dhuyx,7j4ehah inductance 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 inductanc.mp-ol qu,a jxf)xavyx;: m5 (e 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 battery. The time)q.pgkkw rz0, constant for the circuit reprez0k )q,rp. kwgsents 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 inductor are connected in s7j wqvx h9)4 47s3lwcx4 -zpazgiym, ceries to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required 7ijxxw g4z-v9myl wc3, qz)ash 74pc4for 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 samfnbz /p .haf:*e 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 thi at83r1 hbwtj /fpmf.+s circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the currennx3wz397 +kbp wjd 69r:hecw-: mm-go h gpl9rgzb+6chw 7 -e r:9o mxlpm9 whwnrkp3:d39j-gt

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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 whet2 z b.u-vc(p k9e:znun the frequency is c9pt2z.u: e-vn(z kb utripled?

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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 i n ,:e k.gac9:lg 7;ycc8wwkmznductor is doubled, the inductive reactance:9c ag:wzm gccey 7.n,8kl;kw 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 an1.9yeqd5yjgqare 7 ,e inductor approaches zero, the inductive7jaqe19d gqyr5 ,ee y. reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power o 0ueucn(5r*6axq +ue supply. In this circuit, the curren rqe o*+0e5cx(6ua nuut

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when the freque/ fc9gtyh8qt. :5lj 1v -rceovn/f.v gtot1ey5vc- q9jl8crh: cy 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 voltag;zmu bn2lb 4:ne across a capacitor approaches zero, the capacitive reactance of that caun; b4:2blm znpacitor

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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 thd :id:,gri0mditt6v7 e inductor and capacitor in a d md:i7v,tigr d:i 60tRLC 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 92w3x; cheiz scircuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R increq:uc( y.fjjfj :l:m)sd (.zddases. Whc l d.fdm:yjqu):: (szf. j(jden is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The ;+0v8po zio ds3va4-v - efylwimpedance 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 o/aqw-u3syyzmu (u05t f 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 both double in an LRC se cvnr9)tnwdo+jm4e .j/x8 z-cries circuit, the resonant frequency of that circ + 9nxd-zmorv 4jt.)n8 jw/cceuit 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 circuit9pi,a5z(:znivgl vm s,f t3p0 that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit o jhib 2yb1db.1ccurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.l q:1l b4bckm(20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector al4( lb1k m:bcqre 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 magnevf7s0kjtfvq9 3i6 x fx.i4 xj5, wxsff.c:ba9tic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field 6f.74 kftq5af.9cj93,bvxwj ixf0ixs s x : fvvector 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 magnelg cp3h(mz/bgc+a /r5 tic field of 0.20 T. Find the magnetic flux through the loop when the zcabgmr gph(3+5l// cplane 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 lov u9r.m ;mpn3 0rzk g56yd8zjpop 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 fd3x 3c:sbyiynueeo4 6;fk l9 5rom $4.0 \times 10^{-5} \; Wb$ 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 square ftf( 0c1 atpwoi x49+hhrame with sides 18 cm. A uniform magnetic field is applied pea0oc(4fw+ t 9x1tp hhirpendicular 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 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 tur2m**- vyq+nm* ygfaupns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and are2 aa7.s j8enzi1/ -suphlc2awa $0.20 \; m^{2}$ 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 horizontay,3nu(vf+w4c; ,v/zhdd ub ,tsn4duu;g k mk2 lly at a location where the downward componnhvbmcdg3; / vu;u, d(2 44nykwz,fusk+ ,tduent of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.02 w1gmha80 blf m long rotates at a constant angular velocity of 2.0 rad/s about a vertic1w82 0hamf glbal 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-sectional a1e 1f mfjfrxb6e55.2w6bhliarea 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 turns2- jyl . g-txngyvr d*v6q dmp4(rilrc968/pq of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Ea1dl,ckq 7 flh ogvs*b 5-n4-bich 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 uni1-n ,qhcosfl b5idkg-*7 bv l4form 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 wire qxn)ma,*j ox .)c2rmoof 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 l.zuc1qp6x1fh83rrrmi)u qc.og 3u*a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area o z)p3iur6 lfur3qg1hcc.orm8.* uq1 x f 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 maximum x pq;rz d,x1f y,,l2tou(j4us.qihf($emf$ 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 6.0a: q ep7z+;lfu0 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 resisl0nu e+ (gh.awtance of 6.00 W. The motor operates on 120 gah. wu+0(elnV AC, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is co(dfo o )eb1lv5,c-y agnnected to a 24-V power supply. The operating current is 1.0 A. What is v )(of bale51-gocdy,the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. Ti.n2;xn) ksl ixwj avl+pcuuf;k 61;.6hp/jp he operating cur/p lw.k;) h j ;fp2c.k;l6+ja ninisvu1 uxpx6rent is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is c(u, w +,a o*e rw+yx7acuco-fyadem83onnected to a 24-V power supply. The operating cu ,+eyuo- cayfca+*da8rxw3um7we, (orrent 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 redujt rhd/c/1n r-l ri(y5ce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow pqq5psk /udyo(+q6x 8 in the secondary. How p/ +8y(pquox5qksd6 q 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 nece;z1hkb4f lg( ussary in a 110-V primary if the 24-V sehz4 ( bf;1ukglcondary 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 y5bgo5 cp7n4m m1r4 cacoil and a 2000-turn secondary coil. If the current in the seg4o n55ar1cm4b7pcm ycondary 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 q e) buv+..rl 1ntlg)athe primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the.)agqnbu1ll+ . vrt)e secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transforpq(y7f 5zu dznm z99f9mer provides 7500 V at 10.0 mA. The primary coil 79p9zq zyu5 m(ffn9dzoperates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its secnbcnnk *l 5 3v+ ej*-da69mhopondary coil. If 120 V at 2.0 A is applied to the primary, what voltage inv6- c bmdlae+k o3j*p h95*nns present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its secon/s*xp3a ad3 q yc.yq+ndary coil. If 120 V at 2.0 A is applied to the primary, what +xdqq3ac* s.ay 3/pnycurrent 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 turns. If)xkii+pbt) s(8) vtpf the input current at the primary is 100 A, we) vkft)+i tb(8pxp) is can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary 19,4b .jzo6vu fhemgzhas 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to1ug 4 fz6.9vojzeh b,m 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 its secondary has 200 ,hbtum 3a;4 erturns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (negreb am4u;3th,lecting 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 120zkly7lc(d8w 064 s hfhtkx0. l 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 hh04kl6kzfx(y0cw7l .s8t dl 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 voltage is usually stepped 11fi zff 12ag dwwvmdd :u2c:+up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Fi12 f if u1wddv+1:dw czgma2f:nd 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 l) go(nputj*ne *dv k*l,f.,c. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line ofk t) *nf ond* eg,cllp*uj.(v, total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km lrzm, jp58; bfe, c4odvi(6k slong has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce ener ;vk fszr,5m8,ljbp46 oid(cegy 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 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 .c /b.j9y(bcyj: rna flong 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 percentagerb. (9yacy jjncb:f/. 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 zznmsh4775yg at 1000 V. How much less power would be lost if the power were transmitt54m snhz 77gyzed 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. Ig3yl ,w,(nl vst is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in tranw(lnl, ygv 3,ssmission 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 currenf4.*s+yghxe 4nezm9wt of 5.0 A. How much energy is stored in the coil's magnetiz es+h*e m f9wgx.4y4nc 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)-j c(wssxkf.s ibx2, resistor and an 18-H inductor. What is this circuit's time constssc ifb2xs).kxj( ,-want?

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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 7ih( r3xq 2r/ xiar7w4w7fylvthe 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 plac0qrlea6oyl)) w)7+faxi: b q qed into 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 1bpxyanmvyc e-b3 0/ z,s5n39z 20-V AC outlet. What is the resistance of the lambca93 n/z bpex-3my0nv yz ,5sp?

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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 czn )b:f;n-j3bd ,5 tzppzuuz8onnected to a 120-V ac power supply. What is the peak current through td)znz b3p b:u 58fj-pnzz tu;,he 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 aet 81xy35+kk 1viy/h4 sxrcp sc power supply. What is the power dissipated in the resistor?+ys v/rk53tyhpeck x8x1is14

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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 resistor bew ;w /7+v:.sycwa0 8jy oideis $I = 0.80 \sin (240 t)$. 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 resistork zof l6- .qk1(oeyk eaqjl; lu kej96-2(mbq2 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 resistor is -bc 1cp4 m qyx)lflv:nny961kd+* aed$I = 0.80 \sin (240 t)$. 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 o9kk h3h:;(4(dsry/mnxdwpv2v f e9qa 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 reactance of a 2.50-mH coil*rdynz, f 3m2qn3(j6mzwtmfj+37 crb 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 1xg,t -eiqq+p/ :/h bf/l3 inro4.0-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 reaxrx 6fw:+i :pwkswt/r. g1m a*lxx+oj4-x, lbctance 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 inducto;p dkpi0d x84rr when 120 V AC at a frequency of 20 kHz is p x4;rk 8pd0diapplied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, uw n1o*fla) 2zla6e+t60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at wy7(sa-8)b qt2;btwkqfoq44cv s/k d10 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 rlk 5 mmeati*-rrhb4;o-q3qm 3eactance 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 12n.0*co, a wcr mauy)6o00 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 capag:oraf0f *(t2 i(w(,r2x wdz qup mze(citor be 100 W?,gwir fow:*atu2 0 e2(z qp(mfxdzr((

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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 is3ufzx(g :zvor los6/yr5 -ax 4d9 j)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.+q 0a/. bamztn0 W resistance, 15.0 W inductive reactance, and 1 bnm/ t+aaq0.z0.0 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 1500k9j y;;ennojdvh *qc1jt,c2. Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are co d;y ;j1o,2cnt ehk9j.vcnq j*nnected 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 resistor,v*25q8 nkulzp 20-mH coil, and 1.0-mF capacitor ar vn2pz5qulk*8e 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 is the i+ ;fcc9ioxy2s mpedanco ; c29+cfysxie at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series mgnzzq 9,v1(c -l41 gqwhi+h rwith a 20-mH inductor, what is the phase ariq1 nv19 wg 4 (qzlzc,m+hg-hngle 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 neen fekx-6o (t (enmfcgv/* dt6/ ;ab-d/zjsb3 nded in a series circuit with a 20-mH coil and 1.0-mF capacitor for a totals e-/d( gnnjab3bx/z-t*dfo/( tvm6kenc 6 ;f 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 capacitances is needed i8ss32lmpvd8j vew97htljck- y(t e2+n series with a 100-W resistor and 15-mH coi tj2tkmj+-ewdv p yh 382c7lesvl(89sl to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a rzfe+vqepa m ,967b8x 450-mH inductor at 5000 Hz for a total impedance of 40000 b7frpa9e, xe8+v z6mq 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 1z iqsq95n1 g5/hfevd )o(2z zb00-kW resistor at 1.0-MHz for a total impedance of 150 559 q zez12qb(hgnd)ofvs/ i zkW?

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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 cat,lauid+/zgra/ek- + pacitor. What is the impedanc+,/ka+iatlg-/ uedr ze at 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 in n2uvw- c1u/cr series with a 10-mF capacitor at 1.0 kHz for a total impedance vr1 n/2 wu-ccuof 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 1p-p)we9bvt/pqx : -y l.0 kHz for a phase angle of p-t-p )vxwqy :9/leb p$40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is neeu g9crah )pzb80j:p c0ded in series with a 30-W resistor at 1.0 kHz for a total impedance of 4 j)b u0cz0:ch9gp8arp5 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 cme 37* +2z 6b 8ggtfdascm)rqpapacitor at 120 Hz. What is the phase angleqp*fb 873 cgm rdzg)sm+t6 2ae?

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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 m)o z gganrsv.qeeg;p;3 (z5 .a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in s(ogrv zz5n.egm);gq pe 3a;.series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitorb0m :4rwt obk/, and a 0.350-H inducmbb0 w o/t4r:ktor. 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 of78 yu-; zti +buwan1hw capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. i;za7 ubwyw8hu+n1-t 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 containingx )+mcgn --dcx4jv;ing7hge 1xkk g t;o6p3b+ a 50-W resistor, a 10-mF g- 6+;-b4;xodkcx jgxkm 3p+h7c vn t)1n egigcapacitor, 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 nec0rzc,:gdbs xq 8,*skk essary in series with a 500-W resistor for a phase angle ok0sc:dk*8r,q z s,gb xf $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what freqj7xsg; w,h0wunsc 1i+rg 2nh+uency should the cic7nxusw1 nwh2g;r,+hj+0 sgi rcuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output i*a7gpiht bl6 5n an ac series circuit with 12.0 W resistance, 15.0 W inductive retg7b p5h*a6il actance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC ci7ewb. gho*u0mfu7/ gkrcuit 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 resistanceq rm/)q4l oiw *cf*umdvs.9r4 of 30 W. What is the powduq sv*4 m*.iw q/4rlcf)om9rer 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 3z/ .w19s5ibgej tosucqdh(.circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, wjscu g9tqb.zi1de.5wsh 3/( ohen 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 freqe6k.j )u h;jcvuency of a 1.0-mF capacitor and a 15-mH coil in series?.ujecv)j6 h ;k

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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 capa sswhl40 ;j*swpfi *:rcitor for a resonant frequency of ipl0 jw*:hrs;sf4*s w 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 inw- yp o 0afr99w;ceww*ductor for a resonant frequency of 100 wwwry 9 -0e9afco*w;p0 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 resistxxaqyp9 *(/yq8 3vezmh: *-ccr9 mbnzor and a 40-mH coil b h y9eqpy3n* mc v*q:rx9c-8m/z(xazif the resonant frequency of the circuit is to be 1000 Hz?

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