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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 units19 l i2eye )rqa2iys6bof) /ror(tz;k of magnetic 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 states ; m0v(axm;j9avvl iq2that 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 mq(8o7baevo:rk8 j/b wire in a coil produces what kind of change on the inducedk/ar8oo(7 8 bjebv q:m $emf$, 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 throuzfx2r6;tr gr 5gh a loop of wire produces what kind of change orxt5f rrg2 ;6zn the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces whfsxr0s4(fxr 2hw:k s ;at kind of change on the indu2x rwf;k rhss0xf:4 s(ced $emf$, 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 m9fa)c xvll( vg:p.2h qagnetic 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 c ep2n*-c 07w ozy-1 s v7uhqlqua70orwonductor will be that which uvqpzl7-12w0y 7n wsa7 ro c oe*0uhq-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. A bar magnet is held )g-fyvap ic(kjx t 6g yp/(-.labove its center with its north pole pointing down. The stationary magnet induces (when viewed from ab-c k . pa (ytj6vgxi-(fgl)p/yove)

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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 ona c;n4 7k8tr:l 7zsmla a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (w7z 4sa7aln: k 8rltmc;hen 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 magnetic field vector po y22+vvk siif(ints straight up. The magnetic field vanishes suddenly. Whe22i kf+y s(ivvn 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 top in a region where the magne-iq.z*tcs xe 6ch97 e4 ybfj+otic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of t9otfes* 6cex +jc7qh .yz4-bihe 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 guw)5ly;j-vd fz if5 )horizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field;j) g55 -fzd)iflv uyw 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 liesz+7p bm6 n2:y4pbjutp/0x lakdyo,u ( on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewe y2p/po ,j0 4+7nzl ut6m:(kydub abpxd 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 throughs47dcz2-a dzh a loop of wire with the north pole entering first. As the north pole enters the wire2 s-zcazdhd7 4, 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 rotated at constant angular speed about an axis whos8yvbq- )wn 8a) u/:xhrxbyvs, k6q3p ne 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 /8qxv qp8n)nsw3ab,u 6:-v)b xkhyr y 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 wie7 +6iej vd)p6bcu y,qre is rotated at constant angular speed about an axis whose direction can be varied. In a region where a unifp +,v7biuyqced) 6ej 6orm 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.) bxgwvn0-c2nt3 ymmm q0u x+9
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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 dkq u4mqqa8a89u;h vn98zpyj9hq5/s that an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. T4*+p. 6zdcow;el)adnn9vl e-s *xmc x -kd 9oxhe $emf$ 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 dvbm 2***ck8u b5kw urmirection) is moved northward at constant velocity through a magnetic field that points straight down. Make v ur *2*bkmcku b8*w5ma 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 bx7 j k8ks m3zsl+pplb7v( 6z))+ryjmtar rotates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transfol* 2b endye:v3rms

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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 oj 8zg60wybpr1)*l3y g6u ezhff the ywezp z* g8h6ubg)fl01y rj63$emf$ 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 devic a36 yxpexw;jblq8/y 3e 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 thain.l:8 kmizkf- q.q7jt

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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 f kwzux a4,b1biee +-6than the primary coib1xui-4f , ebzw ak6e+l 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 the seconda z 1ywuq1;vk8agyso 0:ry coil th1soyw:vgu;qz 8 1 y0aken 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 powb ptn;m5aq(w,n9ey)p 9u3 c-k goatu 2er 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 circu cjq*y)u*/ j6k jjfo)fit,

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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 3hp ;1pq./cbbdx*td sqcky.-constant terminal voltag/*; b btk yh.ppxd1cqq. sc3-de. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal badund7wqixa /3dje/( ;ttery of constanaj3w/dx qu(n/ ;7edid t terminal voltage. 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 q k-ps3;fvy3r 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 inductance L and resistance R is connected to apeoch x9w 0.7mn $emf$. 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.)r4j8 2jb*o7u*eue1us u qcvx The time constant for the circuit represents the time required for the current b4j **uor sv1euq uj2x8 7)ceuto 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 aqtd ks2ug;2tkhe lz4)c) )e/ 9cfxwj1 re connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the /ktlez2)qs19;j xwk cc2t4hu)dfeg) 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 unitsfv:aw5p y j ,e84w0hfc 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 connected2npwgy-,)e tn.l51 h,trtd o v to an AC power 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 supply. In this cimnt.zg56q.f (c+de g*zmsp4 arcuit, the curren*fz pgqezsmam6d(54g .+ ctn.t

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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 cii1 b58k p2vtlcrcuit changes by what factor when the frequen cbv2kl t18p5icy is 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 acrosgejt* 505lmkkj 5k(mk z9ork 0s an inductor is doubled, the inductive rea 5kmk tok 5zj5 ljrk0egm*(k09ctance 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 ,l tl,h3h :pnzbbn1-5y, zrxa voltage across an inductor approaches zero, the inductive reactanceaz,n3,y1rl:h5bpz l-,h ntb x 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 szqs p;jcrdm )(vk)25z upply. In this circuit, the curremc(;52pkqsd)rv)zj z nt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by wh-7pv 2 l9/x)eozrcmh hat factor when the frequency 2xp-v l)/ 9hhmor7czeis tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the u2w rcgq,z 8vs*32 rskcapacitive qs rv2cg 3 r2k*su8zw,reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and ca40ij h (g9i9fr, kfgcapacitor in a 9(rig 4ifa0 9gkcfj,hRLC 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 Rw9jok:k kk v40LC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of thxtg1tu7))8v,q wkwh me circuit increases if R increases. When is this statement truvh uwt ,w1qm)8 7)txgke?

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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, rdd52rzizy+ of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit inmjetfk(k r p9z(d3)7sb+ ajs3creases 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 series circuit, bdztn-ko01j 1. sfvq-f+q(v thtc 4z/z1.ifothe resonant ffcq 1o j/4vtvz1-kz+t0h f bstdn1 .zfqo-(.i requency 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 that is driven by an AC applied voltage. At resona *1)ot aydv.0jo /9 kd;zvobcthrt. ;xnce,

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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 occljo kz6 og wq97g78ijdrb3)* * wgl4zsurs 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 r 4qry*zznx//: w pwr;iotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop whenwz/ixn /:zqy4 w* ;prr 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 unifecmsv h pde-i5r63y. -orm magnetic field of 0.20 T. Find the magnetic flux through the --d. eyp3ci 6 s5mevhrloop 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 in a uniform w9uz,j7mr g ih.20l:ag p.zo kmagnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the mpgk079h .g:lz jzr,aumo 2. iwagnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced 3 cc1/e tl)i g5-cmhzq-cpn5kfrom $1.0 \; m^{2}$ 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 coilef l0-luh,imj;f + 2dz changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a 3(gbc,qpym; hsquare frame with sides 18 cm. A uniform magnetic fm(bpg ,qyc;3hield is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the 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 3 4n74w d9ynh*us vv:nggr7ghof $0.40 \; m^{2}$ 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 7m z d rtiu.k44rb ,o+j8jlwm(area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at ako)t4bz 0f 1hm location where the downward component of the Earth's magnet0o4h) bm zk1tfic 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 , fz cd y)b(c18kxsj1fx5os3 vm:se3 bat a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnee),js bxk8 13d oc:f z5yfcv(bsxms13tic 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 arelt/h am()eqb+z8c c u7a 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 ofpb5 f 3pz+t:rb 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. Each loop is 12 cm:x1 yb/kr,nm adt/c- q 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 uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotb,yq1-d/maktnc: rx/ation, 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 turjznhtzd0jps3j lixu3 :8 *n9 )ns 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 outgs-byh7g9z l u5yt h*.put of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rota.*tsh h9gy7 glzy-5buting 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 gesl** ch:v8nganerator 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 resista 1 . aslybv1gp0k(oczta1vde4c7.i 9cd-zzt5 nce 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 sjgewphv,k vk 9rmw 6.q9 ,7)z6.00 W. The motor operates on 120 V AC, and wh6,w)rhgvwv,9.s kkm pe9q 7z jen 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 connected to a 24-V power supply. 4aqwgjtc.mhd s*96e: The operating current is 1.0 A. What is the start 4mc.ew: ga dhsj96t*q-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 ;c. fdtx yjrr2jhc6;bhzld98y /;j3mbzk:b, 6.0 W is connected to a 24-V power supply. The ok:;j jr ;.byb/3d8h rdlmtc2zxzc9yj fh6 ;,bperating current 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 isiao uba b6he+a am : :+3rq6nak)qsw)1 connected to a 24-V power supply. Thee+nu)q3 ma a66rs)bo :iakaw 1+ bq:ah operating current 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 redbk 4bn6wj2o wf++br ,0srkb5h uce 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 tolax +veg0) z fp8*y5xo flow in the secondary. How many turns are ze05 8lx) yo x+*pfgvain 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 b;wdffht0p ,,necessary in a 110-V primary if the 24-V secondary has 100 f p,thfw0b;d,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 priu8q9j31wcq3mihqsvq h/7j ;uu s5 l3mmary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, wc93/8 i u j5;3vw u371qhqqmsujlsm hqhat 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 tlki; n rp;g/:fnzrb8e+; qa4f he primary of a transformer. Assuming 100% efficiency, how manykr l4rf 8/baqpz gn;+ ;n:i;ef amps at 24 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 10.0 mA. 3ljsd6x2dor4dc, z a,bm/ 3a2 sa lf:q The primary coil operates on 120 V. What doex 2 2l sqfz46l cdms:ab/da33,, jorads 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 onni5l7q y6h dx+g5+ pgq its secondary coil. If 120 V at 2.0 A is applied to the primary, what volta7nh+xq6 gdg+p5qil5 y ge 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 ov4wba x38a1i od89do f4ai k4un its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is apd93ikf8dvaxauw8 o1a44o4 i bplied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 10lxkfpbw x-s di+c0z2h39( 0 c nah.db50 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect thisz0(axcp3w9c5 + k.b0bf2h - xndl dhe 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 hcc,,r vt q:laf16zd5m3q el s0as 100 turns and its secondary has 200 turns. If the input voltage to the primary is 1qz6 ,ldr0mq,s 1 f3lcc5:ta ev00 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turnw4basdv h )0(ccbi/v1 s and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the powecc)ad1(v4 0sw/v bib hr output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage q/-bvu o f12ep vj02p)ep a)uvis usually stepped up to 4500 V by a transformer and tp qej /ev- vv)1b )aupp0uo22fransmitted 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 r.heea,3 mvak4 nz16b byt1-lvoltage 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,bty1lv n z1ae m 3h-bar64e.k the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usualljjz5q-7 jdnw-vu 4 kn.y stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. j4--jq. zvk ndjwn7u5 Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total4mu-.ob)e exqi7 )d/xmm(f nw 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)ei-mm.o7)md xf(u q4exw/ nb, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A g041)dx om fp9a-+toe zpspm3generator 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 orima o xgp0)z-fpm d tp+o9e3s14ginal energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less p qv(h; xny fc:yp1-/zhower would be lost if th-nhv1pq(;/ :hy czyf xe power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted ondf 58cdi5mux 1 a line with resistance of 0.60 i xu8 cdd55m1fW. 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 A. How much energy is stop8w:gorhh sma75 sxgpr3x16ode1+d 3red in the coil's magnetic fih6s:rxego 3dp8sd h p3 w1m 51gx7+aroeld?

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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 jp z +nud3t;u-6.0-W resistor and an 18-H inductor. What is this cir3n tzp;-dju+u cuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC ci o+yfuz4i)vh aolpj0)/fz72 krcuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. c-v5cv -/xgdq What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What iewjls5z9kp0rfb2 , *vs the resistance of the lamp?pl29 eb fj,r sw50kzv*

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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 the peak curru2 y l42/ mo3w9qxmz;,ezvpxfenf/mzwxop23v,xqu2e;lm 4z 9 yt 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 connectzo2pt)-1o w0mw0 ugrj ed to a 120-V ac power supply. What is the power dissipa0z2-gtpjom 0 o1wu) rwted in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistorz7lbaxev l .gb g6jfn9mr/f0k3f; ;9w 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 gb7zm zz* jr4kb3.(lgresistor 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-uo3 7v e +z9vj,vshptcu(pgf8wa-:g ;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-mH induq: 9h8oh4t-xukfy- b mwh6;zj( )armhctor 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 czgr,bg 6xm214wf o; sl9ktqslr+/n7 reactance 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.p1gyriuy/* b ;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 react6y:n/c;r - ;w y z9dnpjfjmks+ance 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 frequkwz*g4u;; ,p ipu;wjh ruu:+cency of 20 kHz is applie* 4k:; z; hruiw;u+wpujucp, gd 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 110vwm2)5-r;ft m iv z-dp-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor atgfe;,iagw71+ p8o b*e2 bha tt 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 ku rdzed7o/+* rHz?

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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 12;)rml6jippxn* e(5 +r cjmh4 o00 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 ql.f9av8ce12 k kfk6 yzy8,necapacitor be 100 W?yq2y .896 f,lkvnczeka 1 ke8f

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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 p9z l/+nsk9ei0.0010-mF capacitor 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 aa5u4m.) f-f )uc *z jb:nj6 cmchn8upyn ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance)jp cn8.:y- 5fu a cu4mf*uzm6nbj hc)?

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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 1500pbv b;ac(-e d4 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connectedbca4pe d;b( v- 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 ap hd x;.f,g/a:,wan enoqz,-g 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conn :qn,d,;np,wef.gh a x -zo/gaected 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- l1rvxq0pd)5s mH inductor, what is the impedance at 10v0plsxr5)d 1q00 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-mH inductor, what *hw mu5r/qld.zrs h:5is the phase anhq 5z:d/luw5.r r*smhgle 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 o,v6 zpmlo0b-series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedancop-ol,v60 mb ze 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 capacitancj/d 2 cub,e2coes is needed in series with a 100-W resistor and 15-mH coil tejbu dc c/,2o2o 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 z .3vianrbw4* 12eq+uvgpq:,w) y zgb in series with a 450-mH inductor at 5000 Hz for a total impedance wezb42vnz 1a .u v):bg*p gqi,q+yrw3 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 pu7tqhmdqux3yxl/9/ef5ww 0h 08 t+ql j t in series with a 100-kW resistor at 1.0-MHz for a total impedance of mtwd 0qu l7thw38qj yh l/95 xxq/f+e0150 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 gevdo+)11p u zcapacitor. What is the impedance+ god)1pevuz 1 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 nktaof gsgez 3 g)9c7 geuc07(*eeded in series with a 10-mF capacitor at 1.0 kHz for a total impegsot eg 37)07(gfagezkc*9uc dance 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 t; fe0*dmmiz)phase emzfd *;ti0) mangle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1 *o2hfo92vtpv-mz(wok fzv *am h.2 l*.0 kHz for a total impedancm pvfz*oh2hfat(2-w.l*o *v9zk v2ome 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 1kd 2. f9lkgoi+p;ni9csnc8-o 00-mF capacitor at 120 Hz. What is the phase +kg9 ;osn-n8iocki 2dp9 c.flangle?

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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 iov96ry4,y,w sdfl8u ii7y.rgf a 100-W resistor, 20-mH coil, and 1.0-mF ci rl.iuoyfg 8 9vy6y 4r7d,sw,apacitor 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,rh/s j*bv08te a 10.0-mF capacitor, and a 0.350-H inductor. The c/bth8e 0s* rjvircuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and anf2q g- , k9fkz*6htkqo inductor of f, qkgot9*-h z2 qkf6kinductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a.zn*tontz frwp*6 0l3 e9ncn( series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?o.fnznzc 3e69w0r(tn t nl**p

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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 phase anglz -px;;,ckgdne of ;,;-pczgk nxd $40^{\circ}$ 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)(tv ;tqal) tr-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving sourcv) ;t(rqtal)t e?

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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 anpe:jyy0 u v:d: ac series circuit with 12.0 W resistance, 15.0 W inductive e:y0yvd p ::ujreactance, 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 circuit fp8.7w7vgbq 0pz5v km 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 haswxw6qq g15+h d- febc; an impedance of 60 W and a resistance of 30 W. What is the power fact6w q5b;+wxdfq gc-h1eor?

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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 80h /y di*crjc1w7g tm50-W resistor, a 10-mF capacitor, and a 0wdgci rtm7*/j8c hy01.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequen ubp5;3;l-daz nbw b;+s8tx wgcy of a 1.0-mF capacitor and a 15-mH coil in series? zn 5b+w-;bw atx8psl ;bgu;d3

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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 capacitor for a re9 lvvyh0kwq2;3f ,0 c;qjwdws sonant frequency of 1wk;lqwv,j d q vhs032yfcw90;0 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 to.t; p v7r3g:todqr)est63b -mH inductor for a resonant frequency of 1000 H)b3p.t3qt:ooerd t t grsv6 7;z?

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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 serrf 9 n--gv kg7tp44unkies with a 30-W resistor and a 40-mH coil if the resonant frek94fvg pk-7-4nrtu gnquency of the circuit is to be 1000 Hz?

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