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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 flux e+pqacmuywul5 .5. p3cxcept

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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 states thm jlc.xc jv2g)2(9dwc at 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 l3ucx tzk: p))0n. nmr5wsb /ga coil produces what kind of change on the inrcw)bn)nmtu30 l:x / kg. z5spduced $emf$, 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 wire producespdjw 83vqseleag 126umr.vwegh3,l/04a :h l what kind of change on the induced 3lv a.3pah hj0e4e:l r 6qsm,d1vgw8e 2 /glwu$emf$, 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 lovk lkm ,h,i*.gas1 4bn;y7kusop of wire produces what kind of change on the induced ,. k4 kiynkgm1v*7;blhs ,sau$emf$, 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 aac wpu) 1obn:7 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 iunpr,1h,sgi/4o3xw3b i 1c u e.yz c*jnduced current in a conductor will be that whnxy/*uhipsb,, 3cc1r3jz g i. oew1 u4ich 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. tqn vj.dvqklz )90a4 :A bar magnet is held above its center with )ql q0 vzk.j 4n:atv9dits 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 tabl)6b fx, l2ehfae. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, tlhf x f62ba,)ehe 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 where the m*jyosg-uy -iqy)i d0; agnetic field vector points straigi sgi ;d)-uy-0yyq*o jht up. The magnetic field vanishes 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 t;ga nz.p*dq z,able top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed froza g,p.z*;q dnm 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 whern3v egv)8f :bm5pxd1 ie the magnetic field points straight gxmde:fvn)8 v p15 3bidown. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and cdkik)3:0+ k,bfphj,c rp,dt l arries an ever-increasing curfk,3i d0 +lkpp, j,dcrkb h:t)rent 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 loohh,3p jyw0e pj8j7u c-i;2 wtqp of wire with the north pole entering first. As the north pole enters the wire, the induced current will be w087w;eq j p,iyt 2-jphcjuh 3(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 rotated at constant asx1tjk2q yl y4( gi5 es14fxc:ngular speed about an axis whose direction can be :2xksl xeqg1i j4ys45tyf(c1 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 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 constant angular speed about 2 ehi6z+;x lt17qv.e f/ahouob,wt (oan axis whose direction can be varied. In a region where a uniform magnetic field points straight down,/o(6o1e2u7boze+ . h qlwf avt; thxi, 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.n/0su:j-cmfw r1y n(vjzp7n2
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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 )nr8m15n4e v 80 t:jmgxrwvhpthat 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 magneti6ee o i02rq)w.3. 3y zpmuyovlc field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northward at c:k:1syhoe-wxu v3 bstv/ 7w,c1x.o.z pjux3 aonstant velocity through a magnetic field that points straight down. Make v3-7ekhw oca3s uu.zo11v: sbxw/ xp,xj. ty: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 an19rnq7nfj) lngular 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 transk a. r7zk )9ocnmf3a1oforms

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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. + v akcbi)v/kq:awa3 up1d:j2rqj, d2 The frequency of thukjd2,::ad piqa /vwvkbq cj+2r)a3 1e $emf$ 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 1.z3vlw;qd m0la; q zhused 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 thaz/q1;-hwzx ji1dp n)lt

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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 loopsu l-ozgrxr4 02 than the primary coil4rx-2g rz0luo then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than 2fyy9un; l o6tthe secondary coil thut2oyn;l9fy 6en 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 po7kle:2ebn ,sh epi(jt3) w lev i7k..jwer 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 circuit,-n szpip11-:t4jmmj k

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal beq,g1 ,91 guxu ll0itwattery of constant terminal voltage. At t gul lq1,x910ui,twg ehe 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 idcp 0s-xus;zx80wx y0 bn wo4ycx /n6ia*8sh(veal battery of constant terminal voltage. wx;0cpy*nwossxz bx/8uyh( 600 v sa c4 in-8x 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 R is connett6by8+rm7t 1t* j mfncted 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 inductance L1 cnz:sdx b1)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 iz*t)e2nd*jtz5 u ga ;exb.ls5 n series to a battery. The time constant for the circuit represents the time .es tde )*ngj zza l2t55x;b*urequired 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 batter :wi- 28 0/*znfoljy.dbyh pyay. The battery is suddenly removed from the circuit. nbzy0a.hiw-yo 8 : d2y/lp jf*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 followinggugbca l b qo2e-h27xyt3:,h( have 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 pow gfh9;n9.xbwl4s 7ebq er supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power sul xdjc5 pfd/r,r t q+eb 2,)/13fvhcuupply. In this circuit, the currenhj/2, v5,efr r)cxptuqc lb/1+dfu d3t

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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 when v0j bzpqv m.nn -bcc6h)0w-q0the frequency i.hbj0qnm 6-q)zw vp0 0b v-ccns tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the inductive qog1j0wqlgu898 zxz*j a(-c . by)mi lq6v8bb reactance of that inductor8q9 (x1 glu0z*)a.vw6 qcjlozqbm g-8 j i8byb

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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 zero4bv q2rwt f8y6 j p(egbull36wzj,,w /, the inductiv ybj,gq4t bj6zwl pf3u 6w(lev28r ,w/e 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 powhmv u6z -:16hwluz ng.er supply. In this circuit, the curreguuz.h: zv6w 1 lh-n6mnt

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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-4/ g w;wekb.wogwab, the frequency is triplw w.4/ e-wbagb;ogw,k ed?

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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 c1xkb tx:. u5ew+m wztf6lz15lapacitive reactance of that capacitw u5.z 1l+xtwf:5zm6et 1l bxkor

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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 capacityw m mbe5j)qpc3*,*ghbcti(.)2wvqi or in a RLC se3, m.jhicw (m tw)iqbb*)* ecyp2vg5qries 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 izq vk5-m hn6h)vs+6rms 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 circuitkxepfp 9:)j q: increases if R increases. xfpp e:j:) q9k When 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 impedance of the circuit increases if n,quyt ros37c6c -f0k$X_L$ 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. Thq /5sfc*: gl tq)nd1sve impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance bothnzw xht*)cj --+alw63y-al *c ujgtk. double in an LRC series circuit, the resonant frequency of that circuit willhxl+-t*6nzu c jka.j* - 3tgawl)yc-w

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At resonance,/1y6b) i ef7ise zkz,t

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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 oc.)egwr4 b b6uvcurs 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 ro3watpv s+ :/b.iz1r cstating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane oscsi tz/ 1r:p+3b va.wf 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 magnetic3po ruse1j2 ,t field of 0.20 T. Find the usjt op,r3 2e1magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating jd0ds9j3oj7 x )+8,ro lzahyp in a uniform magnetic field of 0.20 T. Find the magnetic flux throug,jy90sj j3prox 78+dzh)dalo h 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 nx i kjtat/1y83)ofgn,lp 4tai3(t6sg o, u,zadjustable 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 changes squ69h f znri+6n03(vg1b4x5v hfrcefrom $4.0 \times 10^{-5} \; Wb$ 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 oh0k ny pfae3j*.nma*gc64rn (n a square frame with sides 18 cm. A uniform magnetic field is appliedhan*yr 3ka(m n.jgn4p fe*60c 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 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 frsk*7p3grhv w5z3zz 0h yk 58area 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 a*l m3fng ml/mkf)f 3n+nd 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 horizontal+:ib5(zbw (a;b(l ca hojssd9 - dtgr6ly at a location where the downward c b srbaj:bdz9sc ( -dgati+5l(ow6 ;(homponent of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angular velo; c8ts j)xyi8jcity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fiej jc8s8x;tiy)ld 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-sectiopk v7xh1jvv* )nal 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 turn8re tbu+d:1oym js5 q3s 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 itsh 62i(y*gap;/c ggjwg armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a ugy6gji pgcg/ahw*2(; niform 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 tkjjb mee,ulq (0;w1r;urns 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 an outputq+8d8 6cnn , 9:f4lghxngji aoinix2/ of 12 V maximum when rotated at 60 Hhgxoj/ind:if,a8 g l2 9q8 n4+nnxi c6z. A magnetic field 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 maxl8f6ezcq9l- .3 kifvl imum $emf$ 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 motor op felx*l ,xd9s (5n 0brl9ehv,uerates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operat/8ox pj bn ebl6ljd*32xya3c8pn4o l4 es on 120 V eo4j ynja3/8pd8 bon ll l2bx3px4 6*cAC, 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 rerrdahid1:2 6a sistance 6.0 W is connected to a 24-V power supply. The operating cura1dd r2 ihr:6arent is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connectedtrik61j r9c.x to a 24-V power supply. The operating current is 1.0 A at full spj6cr1 tkxi9r .eed. 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 resistackxt 7ekq7do8+04bczcm ); rnnce 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the bac c 8mrkd cxncqob ;tz+e074)7kk $emf$ 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 volra+qy ubfw e, piv2f7:c5/zc4tage 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 of2:nqpb p, qa5ug /8,xnlijpf/ a transformer causes 14 A to flow in the secondary. How many turns arpj 5 l,q/pax,fi:u / bqg28pnne in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 11+ x:s9k/n6x/2t rw(i9 gdnqzcc:k nwj0-V primary if the 24-V secondary ht nk i9 qswx dczx(:w2r9j/c:k/6n +gnas 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 :ykt bps , *5ubu8roq,500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the psu:,y8 p kb,btu 5ro*qrimary?

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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 flows6 cb ,b9teq-(oe l9lepu68dlj in the primary of a transformer. Assuming 100% efficiency, how many amps at 24 V p6ebl9bj8-,l 9uec t(l eq6do can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. The a 9; .vl)gapmuprimary coil operates on 120 V. What doe p.9g)av la;ums 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 transformeryf 3s7cuo) 6sd has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applie6df3sosu )yc7d to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 tukl sh+qoxk p.;8 k-ub6rns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present 8xklksbq ;.6+ohk -u pin 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 vxs15j ;8f : 895yot4 im8wvm bfswaiihas 200 turns. If the input current at the primary is 100 A, we can expect the output current at th8 xfw :v8via59w 8s 14;t5m bfymjsoiie 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 svm8 -i)ar 0iim4p9sryecondary has 200 turns. If the input voltage to the primary is 100 V, we can m vp8ri0)-y9ri4aim sexpect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary hx;b r g01dl /nm0n9uedas 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frixn0eg0bld 9 du1 n/mr;ctional 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 aedtk8 kc8m(v*-d;zjn33+u.v ;agk a6vokte xt 120 V. The voltage is usually stepped up to 4500 V by a tranu-vo cv33akm;xd v(k6t 8*gz+;.de 8ekntk ajsformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is us(vpt5 :gsj. mzrolbif);k,-bually stepped up to 450-zm: o)i(jsb plbv trkf5,g;.0 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 wk2ldj+41 qp sc315dx4ldv zv 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 the1jx1 vwqp52kd3dc +l4z4 svd l 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 resistance of 0.60 Wmri8n. l 46sx-e:ihfj. 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 :f nmsl x4 re.iji-68hof 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 resistance of 0.60 W. A generae6 .hrr 8tu*aeogbu9+tor produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with ah*arg.r98t6 o ueu+eb 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 downfo8tovb;.8ut *gjdoso( 25m h a 6-W line at 1000 V. How much less power would be lost if the power wet oh2jv*8ut;msb (5odogfo8 .re 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 tr29 /4efwlhzy sansmitted on a line with resistance esw h/9zly42f 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 current of 5.0;dbww i) c718sxjfz h2e.r9xx A. How much energy is stored in the coil's magnet;7z1w) d e8b2f.i xcx h9srjxwic 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. Wha32hq zbh q5 ng c,kotw9881hcyt is this circui o3qcqb 2n cg859yhz8t1hhwk, t'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 inwqs,p4. 8ujj,o9ph bvgj;i3 f an AC circuit 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 12021 dgm7;ddhjk -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 ifr xkyxvlf 83n0 x)0f53wh7 gynto a 120-V AC outlet. What is the resistance of the lamp803xwx x 30gfl yf fh57)rvkyn?

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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 suz z;t+ e x (ldh 8scwmvrb,3v2eo7;u:ypply. What is the peak currer ;7w t2deev3ylzb8:s;v xcz+u(m,hont through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac powe;x vbvh ( px fg.95n4bqwewd02r supply. What is the power dissipated in tdf5w9bn2pvx.g(40xv bwq h ;ehe 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 ab 58e gpysxt9/ 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 resistor isuqqncq.*o f4+ $I = 0.80 \sin (240 t)$. 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 isjge. *j ::n o3v7gmzax $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 103cdknq2brm h 9 i6ev1.0-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;y,7nq2rorl b)w5r lw 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 coz:xr9hsqd(4l7 z ff g2il 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 fdb7n )m6 2 )qob4jej4s:gzwzxor 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 V AC at a frequency o1b tpl2i5w6 2sdnuw4hf 20 kHz is a12nd pst h64lui5b w2wpplied 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, 60.0 y9srgdo 865mqxq be1: 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 capacitiveubud2(wgz f23u:yt n7 reactance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at 10 kHzhx96q/a lx zuh (f0a,d?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency doe ,z(p+/agucwjpr+e9 ps a 10-mF capacitor have a reactance 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 wi u;y6 dypb;h6(ntlr jocraw-u( 4(uoq l7x )x8ll the capacitive reactance of a 0.010-mF capacitor be 100 W?xb7d4(y ; cou6 t)6rla(8lh(j y- rnqu;pxo wu

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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 ltmf f3-m++mr.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 witxsx x2tk2u:rl2 sbj/+q:; xzph 12.0 W resistance, 15.0 W inductive rj:+ :xs s 22tx2x;kbu/ lrqpxzeactance, 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 impedancez.+-mevaeox7r ji ;c +z e,-.igz( vwt at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capawe,(c-e -v rvijto+.zzezi7g;max+. citor 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 100o+6uxc h90b li-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in selx+b h69c0u oiries?

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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 abo, (amz7 *lde 20-mH inductor, what is the impedance at 1000 Hzm(*7bo ae, dzl?

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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 with a 20-mH inductor, what is thez 8 lwo1+rihi445dm* mvwa;ict8d.z i phase angle a*a44woz dhw dic5.;lt1vmir+z 8mii8t 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 with a 2kelyb5m4k0,he ( om:g0-mH coil and 1.0-mF capacitor for ak0ok: gmy h4b me5e(,l 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 following capacitances is needed nn zpkp,jt*;fd9, w+ tmpj/0o in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 0,jj wfpmzp +on;/k t, 9pn*td2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 50xfpc5 qbv0p+3 zi,gugs4w(t3 00 Hz for a total i+upp g3t( bw,i cv04zgqfxs35mpedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-Mcz x-0*twqm36b.m h /d+cjnf 5.wr9kratq o-wHz for a total impedance of 150 qk6f5 rx.wqmo3 -crz0n a+cmw. tw9-b/th*j dkW?

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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 witgvg 1o3w4jgduk+4f* mh a 20-mF capacitor. What is the impedance at 10u+g *1gkd 4 fgm3ovw4j00 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 seriesjec2 94sb) j/x. dufya with a 10-mF capacitor at 1.0 kHz for a total imp 9b 4js2)a dxj/efu.ycedance 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 77h:z cjkarm 8*-q9 uxsjgp b;phase angle of j: a zpm7*xsck9;-r8j g7hqbu$40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W d0ka de.gdok m2w4l 5)resistor at 1.0 kHz for a total impe delaw40kdk5. om) dg2dance 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 series with a 100-mF c k,qkg+t9y ,6ou,j udpapacitor at 120 Hz. What is the phase a6g+ ,puo,q9 ydtk uk,jngle?

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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 resise*ea -4:he/* q krm7d jbozi*ltor, 20-mH coil, and 1.0-mF capacitor are ckh-l: ir*zmbdj ae qe/*o *e74onnected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF cayl97uet6i +t f 7m-rcvx2fg,hpacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is theg rh mit- 7tv6 e72ycf+fx9,ul 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 capacf; f5dfygz 7b. 57adrcitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hdygfr c5 7zf7a;5bf. dz 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 R: nf5nmy0fri ,LC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hzmfn5:,ryi0 nf 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 serie ww *v;yastk8lc3/dxbpl),*as with a 500-W resistor for a phase angle of *dvala)p,c; wxylk /w3b 8s*t $40^{\circ}$ 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 freqk j,8u*tpp8hgbr v2c: uency should the circuit be driven in order to have maximum power tran2jth8 ,gkvp 8p:*c brusferred 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 ser:ggu v my;s9nk, rw;+rfzv4 8jies circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the czkwf4+j y:vgu rm,;s8 gr9n ;vircuit 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 circuit is 4jol4d oo/./ 7pgloub $63^{\circ}$. 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 6v uzufq*t9*o-m5pegii2s3l3 ih;rw-0 W and a resistance of 30 W. What is twr5m 2fig-* uu 3hip3l qzi*-v s9eo;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 rm* 9y.nvw jv5yesistor, a 10-mF capacitor, and a 0.45-H inductor, when j5mv*.ywn v9yconnected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in seriesrghz y3u2k n:*?khrny3: z2*gu

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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 :wkb*two*o n5hy18if 4(zrs i.7-mF capacitor for a resonant frequ *ihksb* yitw:1w8nz o(fro4 5ency 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 a resonantjsmp,4xspw7nn+. 8 td frequency of 1000 Hzsd7 ,wmnsn84 .tx+ppj ?

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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 ;s1yl*-x kc ogdtit3gy 5ju (r ifj0dp0t.**uwith a 30-W resistor and a 40-mH coil if the resonant frequency of thsf u3*y *;5yo ug*jg0k t .j rt0dl-cix1(ditpe circuit is to be 1000 Hz?

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