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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 80 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。本试卷的直接作答链接 https://51fly.win/test80.html
 作者: physics    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 magnetm+-9:cw xcmj ( lyz3ggic 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 s(3 aefd /ro,kntates 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 y(ccg 6ta*jt5q hjk+3 coil produces what kind of change on the j +g3k*t 5( 6qcjctyhainduced $emf$, 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 r3*vuv *e s5exfield through a loop of wire produces what kind e 3sxrevvu5**of change 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 prodr*x*wywzot oo s)-c;3 uces what kind of change on the induxz; wo) - c*r*wtyoso3ced $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic k3 4 znpp/:xpm7ku2waea35/ bk sl gc6field 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 condfj4ceh (;* ubductor will be that which 4hb* ;fdj( ecutends 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. A bar magnet is held ab uawws:1 ,kkv* sl*s/aove its center with its north pole pointing ds/wak v wa1usls*, :k*own. 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 h6hf i*(v it:yjorizontal table. A bar magnet is held above its center with its north pole pointing d(vjtyi: 6fh*i own, and released. As it approaches 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 tyntw-: 9r+bz nop in a region where the magnetic field vector points straight n9yr-t+zw bn: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 table to,xtcsnt; gi-;dw)j b 7p in a region where the magnetic field vector points straight up. The magnetic field suddenly grows strong-;ibtdctj,s ;7) n gxwer. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal t,,bta jh+w)jvz/fy u1 l9z u4oable top in a region where the magnetic field y/w j,lu) jzobzu1, 9avfh+t4points straight down. 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 lu)ma* 1e0jsk9 csj0ities on a horizontal table and carries an ever-increasing current northward. Two*u00tei jaskc1)j9 sm 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 z+ me fo9(k nob,9m5qzloop of wire with the north pole entering first. As the north pole enters the wire, the indem(f 59mqk9zb ,z on+ouced 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 rotated at constant angular speed about an aufdxf-4 +mt :iw(vv:bxis 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 induceuv +x tf-fv idm(4:wb:d $emf$ 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 anguk)i d(nvdbta4h ugu66iff+ ,9lar 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 th k+ubtg649v ifi)hd(afu 6,dne 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.)zg s17tnjd l-
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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 thatx,m,+kfi1v kt(8xyq)aoke c 4 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 o*7ws-hue:97myg feya 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 dijhgh f u.ks/gt8j d0*0rection) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induc0 gktj/u*hj8gdf .hs0ed 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 angular velocityj z.6c37f;:(vnmzq,k ymb bfgop-6px $\omega$ 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 trane--m5 on,tabosforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frequency o +9rbp6l1 wuwsf thsr+uw91l wb6p e $emf$ 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+teus j5os1*3 mwpf3 i 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 deak307 eblh;1ypzsbo5 vice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if thevi* bmt9tq02 f secondary coil contains more loops than the primary coilvbmtq9i0ft2* 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 p9c::mb*i x/s*uusgy than the secondary coil then it is :*gps/ms:9*bc u xi yua

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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 inputz::tp ,w9s. uur/gj*nx lkjx8

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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 resonab6,w 4j+cc hw ;c7lc 5 n5qhk2hhu3tdatj 0zb*nt 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 ideal battery of constq lrtw)g9 ;r1vdpg:(cant terminal voltage. At the moment contact is made witp;v1t)lrgrc(dwq g9:h 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 ideal battery of co8yk ycr e zpx5p45xr8:nstant terminal voltage. At the moment contact is made with the 4 ry5kzppy8c8xerx : 5battery, 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 ind4vd. *q g7iw,;phy8je q5jdxw uctance 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 wvbjy2z nk ,)1uzvqk+ -5rmiq, ith 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 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 serie gi3tc/sli sq7l-pzp j i)0q0pb,.c5ns to a battery. The time constant for the circuit represents the time requirezn0, lii0cbgj) pcsi-tlp53.q/ sq 7pd 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 connex.x wpt31 oudh3nng50t2sl r1 cted in series to a battery. The battery is suddenly removed from the circu3ur n p 1t hto0xxl3n1ws2.dg5it. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units excep*g2qui 7,fppup:y t4lt:

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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 thispr1*hb qo+*lrw ik.o: 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 g)qy:6 dqmd 0apower supply. In this circuit, the curren0q)6gyd m :dqat

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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 ciz:6 hn5/ wk2 ypxnhtx a*:30zbsa0ylrrcuit changes by what factor when the frequency is tripledzkhal*xyp :32n a t0/nwhs605 br :yxz?

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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 +ui6byj qj5n7/ tip /vinductor is doubled, the inductive reau/tjn+i q i vj56pby7/ctance 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 vollqdjga * *d7g3tage across an inductor approaches zero, the inductive regq dl7jd*g*a 3actance 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 s3zhq6yz g s+ ac*so2eo(jfvu cv)39/uupply. In this circuit, the curre3fa/(u6o 93c*vz jc esgh2v) o+ zuqsynt

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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 factorq ge/ f 6vdk(krt*gsgaf83 f1os)u w2: when the frequency8)e(2* fg gw3 dfkq/:6rag svks1fout 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 towvhn9go9za7eze( noc-2 * 4o 2wqtp;he AC voltage across a capacitor approaches zero, the capacitive reactance of that ca9nt9o n; v4*z7(c 2hgoeeoq2p awow-zpacitor

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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 voltagext- ve:i3z2 k*or+1 hvv )l-chy/dqyrs of the inductor and capacitor in a RLC series yhrq cxzod+ihtk/r vv-2l- ve) 1*y:3circuit?

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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 circu ghnfi*bvb01p2,v sx*it 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. t03f asu0(vz c*ylhb0 The impedance of the circuit increases if R increases. When is this stat*0 zt3acsl0by(u0fv hement 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)+a v5wp.tbd i 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 imp du9 0k)80wbeu6 e5vvui5uoz-sazj m0 edance 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 both doubl v;jbx,2u*lctr*ml 0 pe in an LRC series circuit, the resonant frequencyj 0*u vblm2x,l;cr *tp of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit hlp8b7imm 7/-is qc9u 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 circr85 q4kk m*ij2i+m lnfuit 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 rotaxc9c4 j a(ztsbpdds ,496l l+jting in a uniform magnetic field of 0.20lss(c4c9ztjp 9x b+d,6d4la j T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a unifor9okn pl3lf+szlyi/4+ p r12xbm magnetic field of 0.20 T. Find the magnetic flux through p /23 x4floblizy9s+npk+ 1l rthe 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 ro bct66)j 7yvi7uve4f mtating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fiy )c7i7m64vfu tv6 bejeld 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 adjustabl uq*ep13v ed.ae 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 frorn9;mgs w i*5u,tb3t 18pxlv rm $4.0 \times 10^{-5} \; Wb$ 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 jwe i og f0qsm2c:-mmh3*u. -y.qmix-on a square frame with sides 18 cm. A uniform magnetic field is applied perpi.*cmmu fmq3sm- -x - .02w:ogy jheqiendicular 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 area ovc*4j9.fk, aae:tqz ff $0.40 \; m^{2}$ 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 axrai4uf7*+t u)cqm9g 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 m51;k1 acqjatn v /vy260 m flies horizontally at a location where the downward component of the Earth's magnetic fielc; km y1va25ta nj/qv1d 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 lagh7nsb) ww* (.bwtmbp89j 3nong rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends tnsjn9b pm3ba. hbww*)7g (w8while 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 genera+lgn,23y gk 2yj,,3hzjcbynptor has 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of arer yv:.s-p2gnla $0.090 \; m^{2}$ 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 loopsuv,tfnu1 6(v 4m hm6zr on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rp4r1 um f n,vutmz66hv(m about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns o w/kkt n p2:fws 1f*t( 7(xh1rhtxg+vmf 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 sivfkz 8wi7 dpj9:1-xf smple AC generator with an output of 12 V maximum when rotated71fi :zw sk9-jxf8vp d at 60 Hz. 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 genx9;)*3iiht icfa5oq (onetv ;erator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a jn xy 3;y;zhad9 q:4axresistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.085w q 6g9h0xctz6jhdp0 W. The motor operates on 120 V AC, and when running at full speed it generates a bach 69pc qz jtdg8w5hx06k $emf$ 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 i-gk4d(el 7 81uivu jeis connected to a 24-V power supply. The operating current is 1.0 A. What isjig-1uv7u kid e l84(e 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/02cw30xyclpda e mh8 supply. The operating current is 1.0 A acdw0ya/p e2 3x mc08hlt 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 connecte e3p ji y2min2n:d7pi,d to a 24-V power supply. The operating current is 13:p iyp72,ne nmiidj2.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltag;sb/c3b lj.*yk mg* bie 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 in 5+qewyim4tvg e4qz68the secondary. How 6qvwey me 4t4q+8i5g zmany turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary inpyln*;gp m-h. 5clo8e a 110-V primary if the 24-V secondary has 100 turlcph .nm8 go*;p -5eylns?

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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 w0 -w4mc5l c-mg q3w,oc pvacs:+oam:coil and a 2000-turn secondary coil. If the current in the secondary isl:0gqc4ca:mwwaoocv m p5sw3-m ,+ c- 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transl7ficwx )uks8 t : :7ilryq.g1.7/e/yuutn y eformer. Assuming 100% efficiency, how many amps at 24 gr 7x7nu kyltuqs:.iite/ 8/w .)71uyl efcy:V 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 10oaf6 :zaxkj tg(1c96ea6 ; fp6duyml;.0 mA. The primary coil operates on 120 V. What does the primgmz1o;pef; 6 laua( dcty9ak6x6j6f :ary 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 sw4 ul6grpe9ll-ax n )3econdary coil. If 120 V at 2.0 A is applied w-ealgln3p469lu r)x 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 turnsoy 3 ( /pxqnab9p22ob+oo0y md on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, whmp93/2a do yboyx0(+np o q2obat 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 1ri.q:glga ce l9+hmdb 95st9(qy)0s t00 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expq sq .5 drtb:gllhm)0yi9+ea sct99 (gect 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 has 200 t.zkd( eoof) )bm 7gd9ke31b mpurns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secon1kbm)zdp 3 ).efgbeo7d o(k9m dary 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 sec ha dw mo1e 86(ivq1n*z;ef/thb vi;q8ondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictionalho a*n;bwt;qmz (i8 fe8di /veqh 16v1 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 608qfp:h ht yt080qk vmzbn:) j.8rqxp 1 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transjp :v 08.8 bqyq8t1n)phmh0qxr: kztfformer 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 curhgeq 912l dpl-5a /m4h9ixi kprent at 120 V. The voltage is usually stepped up to 4500 V by 2xl5p iem -k hpgi1aqd4 lh99/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 cur45kqx 2uga zf t8:duc3rent 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 percentage power lost in the transmission line if theu 83dfztxk g 42:quca5 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 r:im j4wpzj r h+j)p5 p,04-f p,jzeldresistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the:ze-j,rj0 r, fzh4w4)+m p5ppjjd ipl 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 long u (0/ir)pz:rm y:q f ix2uiyc7has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the origina/uq7u2ziy: my rxii:cr fp0)( l 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 1ix2lc/8+ 7: t0kiebt mvsi1kj000 V. How much less power would be lost if the power were transmitted at 3000 V instead of ail0i te tkj:m s7kibx 2v/+8c1t 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 /xcfe a6 ,4fes9dac (kbe transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformecf c6(a,eedask4/x9f r if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored i+ab0z i.p*u1 u 2vy7jsfqv *qri6su z4n the coil'aiujv f0 i1bs.q6u2qsp*7z u+y 4*rzvs magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a ylfvn4da* )m(u,k.e/ z jyj,4 eps882inssaq6.0-W resistor and an 18-H inductor. What is this circuit's ziv8(,n pj)n*.dm 2y4fs j8a/ qal,se4 sykuetime 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 where the rms vonn,k40nw -qox 9h5wfy ltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. Whaa1cz5-uh o.ywg zs*/ct 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 into94f 4dunfvj/nn7 7u(/xe bnfq a 120-V AC outlet. What is the resistance of the lam7fnf 4(7bvq/unfxe4un/ j n9dp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is c*6 (1d2wuluh5ho 2am hw2wzw the peak current through the rw cdu2z(25mhwow 6l *1w2uahh esistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the power dissf s80;ss 9s iejp*pik)l41xctipated in th0p4;k9li*s tsf)isjp1e x sc8e 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 a 50-W resistor isc7 . wui99cwy1b hmp4n $I = 0.80 \sin (240 t)$. 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-s3cvcc fht68ccx8/u 0( y ggr9W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50 j9s48 q;pralv-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 reactance of a 1.0-w c--er. 9k k a;5g,u)ttjc*q,,e(qsjvp fxe emH 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 reactanclt:x .eu qb0f3e of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reactanckqf d 7gi1c62m0:svm4 7ucuhlm:qhq:e?

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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 1oers24nl 0; kiq ))knv57 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 z1+6onb sf/ :y+bmex hinductor when 120 V AC at a frequency of 20 kHz is applied tosbm zbh/n6+oefx+1: y 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, abwo9n /18c qm60.0 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 capacitorlce)b.6nek 1 k 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 6 w l4rymjm2t/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 rea mfwfbivswcj+4n2)5i8 / pc5r bqtc)+ctance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capai(1a /sjww3oap m8x b.citive reactance of a 0.010-mF capacitor be 100 W?s1p. 3 8b(oja/aiw mwx

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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+zf6v aas:m i).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 serie m xkeh;,s1e;qs03 afbs circuit with 12.0 W resistance, 15.0 W indu3fk a ;hss;e1,ebx0qmctive reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resisto;mkz9(b3ju*o*gf k m yr, 20-mH coil, and 1.0-mF capacitor are connecte9kbkjy *mf*(3m ugz;od 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-y,u )0 leayg-ilsk/(8ktuzi6ck7 t2 yW resistor, 20-mH coil, and 1.0-mF capacitor are cy eky-i(lkg us/al,tz)ui c7 2 68kyt0onnected 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, ag-7sh,ui * :kl( yoknwhat is the impedancelu(:kys7,oiak-g h* n 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 with a 20 h4/t zz+psf6p-mH inductor, what is the phasefhpt/ zs46+pz angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-md5limvm:*j/ nh 85 ghmH coil and 1.0-mF capacitojm5 imvml:d /* hnhg58r for a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances ist212u9xjax l h needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 1xh a22 xjtl19u10 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH induciv / 2dqlikf( o7e;5txtor at 5000 Hz for a total impedance of2tf/ei( qd7li vxo; 5k 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 tqm.+962 lkiw;m zpow , z)bhmbe put in series with a 100-kW resistor at 1.0-MHz for a total impedan)qtkowm+h6p m bzm;w li, 2.z9ce of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF ca9ug9 .xzq/bibl7-fg ahaveq (d 6b7c0 pacitor. What is the impedance at 1000b/ 6q99qdz.g lhv ag-bib0(x 77cfuae 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 series with a 10-mF capacitor at fa47 2 duooj(v1.0 kHz for a total impedance of 45 W o(4dua j2of7v?

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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 c7db-(;k4bmiizb9d n*ak * utkapacitor at 1.0 kHz for a phase angle o*;bzk9ka(ku7nd *m 4i di t-bbf $40^{\circ}$?

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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 resistor at 1.0 kHz fa u2lp-nf9/ qhor a total impedaq nu9/ -pa2hlfnce 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 capacitor at 120 Hz. What isis /)xy+zzsybx2wt ) / the phase a )b2siy/yw z tsz/+xx)ngle?

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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 9 e- 5/an3b pkq*xlt,eunljf5and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.09-n*tx l 5b3/lpku eaf, je5qn-mF capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, a lotsc0 )oo/.3ui 7miv japw75nd a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is wl ouitm .7j0)a37v5/o cospithe 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 ca:b fbt7:g*g 8nkdztt; + xm)ccpacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series tfx+ g:;b:bz7k8c *mgtt)cnt do 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 cqcl, .iq6h4w tontaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, whenqql ,wt c64.hi connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phas7l)/fvbr s7 sn(jt n+re angle orj tv7bnrs7)+ /nsfl( 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 y(aq wykc*w8n95gnx 5 ntq 46gR = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency shoulyg9nw(4w ay8nt6qkg qnc* 5 x5d the circuit 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 in an ac series circuit with 12.0 W resistancx3:syq*jmgg 0- m yq.se, 15.0 W inductive reactance, and 10.0 W capacitive *:yqmq.y0- ggx3js ms 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 / pou0i 2-qrcgb7v,tmcircuit 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 resistann g1/h+e,gsd nce of 30 W. What is th1nh+sen gg d/,e 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-z8y ap +u,9hn8-yotujW resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power s,ahy8-toju98 +nyz puupply?

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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 freq19j6t6r-xv4fa kwasauency of a 1.0-mF capacitor and a 15-mH coil in series? 9xj6 aka-6vf41rwsat

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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 :qy.lu ekri7lbz0a9 k 7 pn1-hab ./tfwith a 4.7-mF capacitor for a resonant frequency b-nl1tkfr z.k eh/ q a9p ab07u7:iyl.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 induc4omfhc /.ss-8xl vc j w2xv36itor for a resonant frequency omco3j fi4 vlxs6.c vw /xsh82-f 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 placedwr)niw)a i/:t+h;nh)omhc1c )s zz ntqvp /4; in series with a 30-W resistor and a 40-mH coil if i4 ;)hcnzm)pt)v1i)tq/h;n:+/nzr asoc hwwthe resonant frequency of the circuit is to be 1000 Hz?

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