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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习来源于题库网 (https://tiku.one)，是在线习题练习的打印版，您也可以访问本平台网站(https://tiku.one/)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://tiku.one/test80.html
 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 magnetiu ,6p u3 pduf:p2zjn;ic 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 inductionwu lu7f4, 0pa26h6y/pgfbnz m states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops 3oa2dc6a 32hms /9kyj a0fdrbof wire in a coil produces what kind of change on the 6ars30 kmcddyj b9faho32a2/ induced $emf$, 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*3pd2+lfuw/cx x rynztt;9-mfzr4 *z a loop of wire produces what;nfrz 9fczmly/udxx+ 2t-4p3 *zt r*w kind 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 ofdtk4 879m tgt bmugzs)3h1b-kug1w- c a loop of wire produces what kind of change on the induced --cdtgm)bu41g1t 9 ws3kuzkgbm h7 8t $emf$, 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 fib;ryq,:woo5qhm t+ ;ueld 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 condk ; 6yayq:g:yductor will be that which tends to produce which of theqa yg dk6y:y;: 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 tablexx 2 6q *b7isdqwa :g(yv8vkx5. A bar magnet is held above its center wvb7 8:a q*65ydsxq(xkiwg v x2ith its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal r1 k2m zgk9swqys95t2table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, ty 5zs2 9tkrmk29sw q1ghe 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 whekda aeze6o5e n/uva1 78fm) -vre the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, wh/ a)a5-nu 8vkvfedm 7za16o eeat 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 re0yq wx61mj;xd x1*o gqgion where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of xy*q wxxg 0q;1j1 do6mthe 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 jyj z9zet,mo( rf1i-, where the magnetic field points straight down. The magnetic field disappears suddenly. z,9fim1t-e jyo,rz( j 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 t:*wlz5 cqga 3qable and carries an ever-increasing current northward. Two coils of wire lie flat qaw c5gql* z3:on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole enth4h22 +)q8ul 8lv z 0ufbvy-zmopu*y u. xyvl/ering first. As the north pole enters the wire, the induhvlluzmh/b *8-vxyoq y )uy2.4z+2pu0vlf8 uced 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 ls 13a crvbguaghb2o,q+ x.:e )q x/x,an axis whose direction can be varied. In a region where a uniform magnetic field poiu2hvb+/ ,xae,ba )gs og1qc:r3xq.x l nts 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 anguladv *s7k(c y( 7(gsd5 bxpaeds6zg+a,ur speed about an axis whose direction can be varied. Inask ( (75y,u(g dapzedg c6ds7+vsxb * a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.wd0j+: dnpocg8 e ym;gfu;/ p-
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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 thawm-l1la41t ,qoa1 who t 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 fie*sueffa; g9; r dd,yjf2nu *x1ld. 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 toesdd09 n 5ta k0bof )xu79l7northward at constant velocity through a magnetic field that points straight down. Make a50utnkt xfsae0 dod9 )b 7l79o 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 rota but j8/v b(7 0zor7fxn1hhp,rtes 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 trans4j d(wp4 oc7 plbjn1lgx2n+lj 2h,0hrforms

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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 throug)/nzywwel0:6qzrm tcu/4w 5q h 60 revolutions each second. The frequency of th )t/qw6zl r w45:u0zenmw/c qye $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used *h*/n(af poq ao-z b;f.71nx z2iie phto

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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 devissok qmaw(rj t)8s(7 *ce 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 the secondary coil contains jh ns i0ynbk6y-a;a)(6rl4 +aj) twrz more loops than the primary coil then ityr4zrs0) 6tal) n ;h ybawj6(i+-jkan 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 6 8qxqv,+*zuxnz vx -wthe secondary coil thxvnxu -qz8 6q*xw z,+ven 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, thep8lma lg ,np;0d8pqq+3z5c ad power input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circuit, x qn.hcu. rg5u7.t0z,b2qavp

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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 s 80 bzo:v6 5c5wmkxzwqeries to an ideal battery of constant tewzq6wvk5 b xmozc5 :80rminal voltage. 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 iniiwz694f dt* p series to an ideal battery of constant terminal voltage. At the moment contact is made with the bat4d6p 9i*wzi tftery, 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 connectbzk 0qir/h;-)q gl pt/ed 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 an e/ouz;pe ma-ejzr k2+3qf 2s8 cqqc 26$emf$. 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 ja2.n52k 0ghx .zz1. uzovetqbattery. The time constant for the circuit represents eoj .0nqxk.zghv225. tz1az u the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor5zfv qzxa,cvltv+)0 + are connected in series to a battery. The battery is suddenly removed from the circuit. The x0 tvcvf,)la+5 zqz v+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 havemua ,(k4fefol uh1:;n the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this cik:o752fo kqikc ls* 7/+rogcdrcuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the currp()w+l hkxm 5ren) (mh k+x5wlprt

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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 duhf1q h8 z5w5circuit changes by what factor when the frequency is tr 5f1uhzd8qwh5 ipled?

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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 doubledvj 5 3phzd ia,o2*274dtac 1 ftffluiwf*+rl., the inductive re jr p.i, dwaaf io3f1*zt22h*lv7tdu cl+f45factance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor 4fsetl4;o: luapproaches zero, the inductive reactance of that coio:u ; e44fslltl

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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 supply. In this circuit, thkvm :8 rm6e 7jr h,(t5(jijdzae curremk( r ,vem ji87h6(jja:5d rztnt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance inbya 9ub 2ph-:s*d mkj0 an ac circuit changes by what factor when the frequency ismb-:29j 0* bak ypuhds 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 capacitorzpcr (; 6w-f okoa0ym1 approaches zero, the capacitive reactance of that ;fo-o a(016 wprzykmccapacitor

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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 wy2-x bl-ycy6h d3/t ebetween the voltages of the inductor and capacitor in a RLC serixlt3yc w-y2ybd-6h/e es 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 circu2x,t:.ivm d6tga fgh+ (xhz+lj1x,ga 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. The impedance of the circuit incbkv 77,hmp0zo reases if R increases. When is tz b,h77ok0 pmvhis 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. + t0pvc3f w rkhvtucd60)v7n, The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. Th(te .w rin)swhzr/awd (p7 4(he 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 both double in afi-a8nhxy a6y-.gbvuf :a2 9sx :bfu2n LRC series circuit, the resonantu s-. a2b2 bnv:aaxygffx:6-ufy8h9i frequency 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 z+(uygfke )n9/ c z-ltvoltage. 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 circuizywtyey d*4 /v8ua/m, t occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.2ro2lg*6 bvt:ix t( :qi0 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are par:v xg *t 2i(:itblo6rqallel.

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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 p,ae x:ldyl 4:;l 9ghhrotating 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 field ve ; h4xhllpy::,dl g9aector 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 r9adc(7in4su ajd8b4do,ij/ kotating 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 field vector are at a9d4a n,jio7j/a 8s(d ub4dikcn 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 a pqxug w.6fd2qx;+h3 area of an adjustable 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 coil6:obw k+4jzkb* jye:j 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 square frame wit2q7mt ;.k6vf9tovc ue*0 qr knh sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly frocr tv.70v6qk* uef2nmo 9k ;tqm 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 ar,ct*fxvp 1a. adg 0hciojwgu)/xn., 6ea 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 andw7gex07; lk *aqmwn;v 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 spane vhyg/ h4yj-5 of 60 m flies horizontally at a location where the downward yh y5vhe- /gj4component 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 r,xd opz3u7 gk5otates at a constant angular velocity of 2.0 rad/s apg,3k ud7 oz5xbout a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional a z:i. gjin)pz2rea 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 ofvj .9;)jo xmfsvbc ok4h/-kl) 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 lo)ukg q)e jhu4f9cq9 s:r5zq.1v k .uhwop 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 uniform magnetic field of 0.30 T,)5)h gq9r u:h4fz1 quck.9v k.qeujw s which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of area .lv23-r8 n dhf )bumz+d b(orc$0.090 \; m^{2}$ 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 outp z v0b s-bw*bi+r/ hy e);suoht:k3s-vut of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is avai/;it vb3wrb- uebhsv+0y)h:os zs k*- lable. 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 withsyu7l6: phh8utuza3/xu*k )e 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 resisbhlo-tp4zb+ x .r2s,y tance 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 6.00 W. The motor operates5 pq fai+pe. fqi-+lx, on 120 V AC, and when running at full speed it generaiq.e,x f f-5ipapl+q+tes 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 r 3du,dad(p:qx/ zjh(zgmjj, -esistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the sxhddz-3g,:, z m(/ajju(qp jdtart-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 resist ehzoj/ gv c 7czh)pc(98rv2)tance 6.0 W is connected to a 24-V power supply. The 2 /zchve( gopzjch 7 vc8)9tr)operating 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 is connected tox:x t( t6uoa*bb3 /suzyo:*hd a 24-V power supply. The *u/b3a:ttz xudx( 6sobh:o* yoperating 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 reduce a primary voltn5),qcvmzi6 y x/oue(h)3qep d(r9ceage 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 the seco :ak37;jm4 )ei napneendar: i jn;eekpem)n34aa7y. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary 5)1igcwrzc ; qin a 110-V primary if the 24-V second; rz)5 cwg1iqcary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn 9)b mv/3n hkr hf(+k3hrq y.qgprimary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is trfnhh(.v9 bq3k/my)rq+g3 kh he 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 prima 2iu9 rm sp:a,jj2cdg2ry of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow i pmag2u2r 92dcjsj, :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 tra*;w7ynl5xu fo nsformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary yw 7lon;u f*x5draw?

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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 an-d bmv3j lzp4+d 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secobpv3mdzjl -+4ndary?

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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 xzjp 6( *kg0mz300 turns on its secondary coil. If 120 V at0jm z6k p(zgx* 2.0 A is applied 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 transfooy k7t cv5ge.-z/1y a zm-pi2crqk;0 jrmer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the outz5amtyz20vyqjk 7i;cr1 kp c- -/. ogeput 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 se; nf:;04ir0 lmvwa bxlcondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the sel0 ;vlmb0 x 4:;nafirwcondary 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 6 7,i(usuxvds3jjkzfb knb , as)f5*:100 turns and its secondary 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 frictionau,x5 kd b7z):(, 6nki juja3ff*ssbvsl 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 is usually stelf2zqo793xt nr rux*/q(/w3 kzf5 m skpped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Fin/57f z3qmor*x 2 uzlk fnkt9x(ws/qr3d 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 usually stepplf 6(gsl5-bh -+ keyhked up to 4500 V by a transformer and transmitted eshf-- 5g6+llbk hk(ythrough 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 *u8bmapn d4jq2hr(rd3sb )3 jof current at 120 V. The voltage is usually stepped up to 4500 V by a transf3bj hb(da) un2ds 8r3rm*4jpqormer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A gener8/hbu y+y f xp0gcvv3+ator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up g+3yvxyb8+u/h0f v cp 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 5d -4 c ectk,cy7v8 3k*yjwig2x0 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy lo*8j gde yvc ,k-ycw43xi2ck7tss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted dowecmhw)1; g,sjhp)eo r * (py0dbx;8edn a 6-W line at 1000 V. How much less power would be lost if the power were ;ophe8*ysrpbmd;d)cewh x (j ,) ge01transmitted 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. f -ysuu;.x 9yy It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a.;yf- yus9xuy 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.k6uauqe;zc:ux(m( ,p How much energy is stored in the coil qmc(eua ,kx;(6uzup :'s 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 6.0-W resistor and an 18-H inductor. a avl.xrqlp;k l t79+i*g:dggm:y 02h What is this cmal l t+:9 i r.g2yv7d0kgg:laqh;*xp ircuit'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 d )h14h8j m evt3y n8.kgxm/rian 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 120-V AC outlet. vc cu+8qwjrq6, iivox+; *ub1What 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 in) o8gb*sxrtq- tr 2t2kto a 120-V AC outlet. What is the resistance of the lamp? qgst*8 rtt)ro2-kb 2x

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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. Whlef.y:* 94gqjbeue*d ;bp,l tat is the peak current throq ; lbu:j*p9l,ete ybdf* ge.4ugh 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 power supply. 11 e:jfzxol f/What is the power dissipated infz1xf/ e o:jl1 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 rqu8bceuiwqbkad p)a;; 62m59esistor 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-Wu1de)cks h: y l: 5wpxhipk 6u97e3j;p 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 aoilje2-)7 f*oeh rvu*9sf 8kx 50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH ighxcy v +zfb ;f:f-19snductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil atf++q6 7c2 bkn 6r cokqgrhq 2j.4)zspr 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 cyij8 50i zv :(xbhzg5g ak(u2voil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 1000 8t*s /tf .txckHz?

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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 wh yzdm6z,o (vs ; p4k2r2b1hr8 yyejo7qen 120 V AC at a frequency of 20 kHz is appliedv4 (pyoym s87h 2jd,2yko;zrbe61rzq 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 Hz so)ij oqfemb35 -ny ir eg06/r(zurce?

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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 cap6l vlwcl(kq *57p3fwiacitor 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 kHz?bi*tj6o7 jecuk60c l )

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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 capatuoz7;p)1mpbn i;vmc p(p cpv7); h f9citor 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 will the capacitive reactance of a 0.010c .81h2ae3 ud)odx pnb-mF capacitor be 100 W?xd12 huc e 3npb.dao8)

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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.eqn )c,flqj ulb3f,0f.hhou+ yt,(c90 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.0 W ind; l7zmmf6*s2gqzh:*hi .c yqluctive reacta.qh qm2*l zihm z7;:gfslcy* 6nce, 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 ao(( q-ahenv0 pt 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor aqn0 o(hae -(pvre 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 q ( krpa 6x4q*/uxo7*,kmllqsif a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected *7qx u la6lqmsk4qokr(*p,/xin 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 wpllkmq 1h605with a 20-mH inductor, what is the impedance at56 mhq 0p1kllw 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 f,e psgel-)q-a 20-mH inductor, what is the phase aelp-eq-f,g )s ngle 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 inp7fb5 0+5 dd)ijc:dhu8 /bttz 1ro ulp(evg,u a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedan o7 58r)zutddj+e/bv5 p iftcu, p0:( ldu1ghbce 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 need;zyvs8w 4du r)q2ni*aed in series with a 100-W resistor and 15-mH coil t2;4nvs ir8uw qayd* )zo get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series wit5q(o(nkgx ut) lxu0s8h a 450-mH inductor at 5000 Hz for a total impedance of 40gtsunx5o8q)( u(lxk 0000 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 serik9*esbvr654 aa uc.2 s kfnn:des with a 100-kW resistor at 1.0-MHz for a total impedf.snu 9 *5kbk6dsv2acr:nae 4 ance 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 i1+k ;i*sedur an series with a 20-mF capacitor. What is the impedance at 1000 1 *d ier+ak;suHz?

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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 serialy/0 8 imuax9es with a 10-mF capacitor at 1.0 kHz for a total amu / il9x80yaimpedance 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 pha;slz3bz4c4vu if wn 4+se c 4v;z 34zsnlf iu+w4bangle 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 1.0 kHz for a total( ozgjoy i/,)q impedance ofg( ijoz,) /oqy 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 Hzipvp4*j9 n z+d. What is the phasivj9pnpd+4z * e angle?

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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 and0vk;c :c2pfj k/ 7doqy 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conney;p k j0/vc :cq27kodfcted 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, and agg gv+xae(8c9-3n(c*f esr q r, a(gbx 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms cur+gr(e bg ,(-nc 3(r axf9vsag* gceq8xrent 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 m*i b0u6- /o/g:vm nkn9vhwpw8nyfl ,capacitor of capacitive reactance 30 W, and an inductor of inductimbnop:9wm8*/w/ ih n0,k- gvf ln6vyuve 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 series RLC circuit containing a 50-W resistk;g0m:u03:dujvjg1 l pz +vzbor, a 10-mF capacitor, and a 0.45-H inductor, when cog1mvp:duz:;g +v0z k j jl30bunnected 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 phase angle x *p0m/o3blt hohlm*xo b0p3t/ f $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = x(kkyrk x4jq /k6in78 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving sourckx8yinr4/ xkk 7 6qk(je?

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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 seridp9 e* r)n6rwaes circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitivdap6 9*)e nrrwe 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 circuiwk76oacy(* +wu kx 9djt 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 impf)-lwur- oy0mr8,y uv edance of 60 W and a resistance of 30 W. What is the power fay0)mrf r l,wvu8-u-oyctor?

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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 ree3 vkl65/klj:pvgs3xvh t(9s sistor, a 10-mF capacitor, and a 0.k p9g evht3jl5(sl k x6/3vs:v45-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 frequency of a 1.0-mF cap-t( zr-/3v ubi(sixvlacitor and a 15-mH coil in series?- b3 (uv/(vsrii tx-lz

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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 2/i:rxuhnc(*aslz- pc8 v.qq a 4.7-mF capacitor for a resonant frequency/nhp :qari*l-v(2.c x c zsq8u 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 ser f-h2q vhsd05hies with a 3.7-mH inductor for a resonant frequency of 10 d0s-25hvfh hq00 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resists2pydt13;7h lwcn.l bor and a 40-mH colbwtd2 .yhl 1s 3pc7n;il if the resonant frequency of the circuit is to be 1000 Hz?

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