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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 magnetic flux exceptt6vk2f0vu4s83 brav/ g dl:n z.,kybx

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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 ind96 n/-qcy wxaq,1usmhuction states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a eitocba1d 6oew a+h7lb2/0o7coil produces what kind of change on the induced 0ed boa+h7e/1 6icolwo2 b7ta $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a l9027)ckpohe 5kbl b y +b ymh)sly3is3oop of wire produces what kind of change on the induc+ hy)c3b o9 )kbb3l7isy2kly 0 hsm5eped $emf$, 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 lon8 .wf tf*:vxsh sf9*wop of wire produces what kind of change on the inducedxw8.t shfvw*fns9f*: $emf$, 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 k ,)q:*akg*1n/pyvtydyy/ uc 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, thetm+u* 8te zd6u direction of an induced current in a conductor will be that which tends to produce which of the following eu6+tm* 8u dzteffects?

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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 )7 q*gcg ufax9above its center with its north pole pointing down. The stationary magnet c*u x7) qfgg9ainduces (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 horizonl,p n ktu z/mt4a33/ .slod37sxxy :butal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falli/3u/k7dbtptu x:4s,z yml3.n3sloa xng 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 whe ;1u mnil xoycmr0t:0+re the magnetic field vector points straight up. The magneti; :01r mxo n0u+ylmctic 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 w4(0qvojg p0 ztable top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direc jwqo p4z0g(v0tion 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 tablqne emez: )l ;/c1-qlz/8 xehae top in a region where the magnetic field points straihqze :e)z /-1mql8n a;elecx/ght 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 lies on a horizontal table and carries an ever-incjb pk.1 m):.68 aqx* aw0m/aaqiat wtjreasing current northward. Two coils of wire lie flat on t01 qa*ja8 ba:.pqw.x6ta miwa )kj/tm he 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 thyzx+ ;d-h2s dqrough a loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed x hy+2z;qdds-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 speeis3wc6pr rkho9,m- vlk *v)e* d about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the o)rvsevmw6 *rc*l 9pokh i- k,3rientation 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 rotat8,auw h(vj(n qu ad46w90u*qx z fwi3yed at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientatioujuxq*wdz hf8( ww 43q6( naay,u9vi 0n 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.3fg 7 ps;,7k tatedm.m
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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 tr91ojpz u 2 wsm(cu;(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 mvoi+0 bylc c5aqkb4, /agnetic 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 eas zxsvkhv+1 *j,e r,2c+s axkw-b+o)ybt-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acrosw)crbs-xy+,1 kvs+ko +2eb avj *,hxzs 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 ry4hk11z uz kgr2 64/dp ukvov0otates 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 e1 lmb zu1eb 1n(:u.jvnj 6nd1transforms

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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 frequem prurgxv kd-to (.349ncy of thrvp9mt.u4o -d gx(rk3e $emf$ 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 devi wwb(i8f/rcw do:9 ctdo) nt+,ce 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 tht-mh a (/9wj cursm(p4at

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the primquy po ry znkk *6u9l)/9o55,4xd dbolary coil bkl6koo4p r u,)yo*dyudz l9/5 x5nq9then 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 secondary((eod+ gq v 0gefr,d0f+gp t;u coil then d 0r+e,o0(geg qgv(fu ;pfd+ tit 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 power inpu 6ppxo3;lf4-ez 1bjaw t

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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 circui bpku86;0b+ wj5 ebywet,

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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 e0w.s oc.kj)lf8 (lwo ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acros(kf.) cleow w0.s 8lojs 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 ,vj 61,m gnfmyto an ideal battery of constant terminaj1ygfv mm, ,n6l 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 resistance R is connef-h- s3dwil. ected 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 connect 3,3;s cs +woh*lblop/ul vuv6ed 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 connb2wkeg7-6*sg gqywub / ph:h 0ected in series to a battery. The time constant for the circuit represents the time w b7:kg62e-pg bsh0 /wqy*g hurequired for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series tf 3rlj 26 ev:j+c3yhrlo a battery. The battery is suddenly removed from the circuit. The time constant for of th6c :j 3frjh32+rlvleye 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 hav:7 zfqs4xcqt * ydn+3n2k vtl2e 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 th7z a7x:6 jyxpurg kyo yq):l90is 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 con,vu9kk 2gpb(; i* kjn/d 8quxbei/ 8iunected to an AC power supply. In this circuit, the current8xju/kqvui9 ,d ugi;b2kpb /ie8*k( n

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by3o z/1;yszz pz7moku. what factor when the frequency is triples kzmzy/ 3o.u1;p 7zzod?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the v,,-xsk0,ddiuu9ct0 imq/ coinductive reactancetickd x/9vo- ,qus0,dm,uc i0 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 approaches ngx -v.u w/y3/ ra gjbf1*ft3vzero, the inductive na-j *wg v/v3 t ugx3ff/yr1b.reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, vkms l3q6wzz-c5 eb0ho;j: q0the currenb0emkz 0qvq3c-;sol5:z wj6ht

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when tg9st6p)4l w,p :a bwyyhe frequency is tripsg964 pat l:,wy bwy)pled?

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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, ttg oitjlvu7s3w 7se*(6i0e( 5j .rmauhe capaciti (e0j j lu5ei(tt3si.gauvm 7 wso6r7*ve 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 capacitor inultg *v. fex+7 a RLC l+ uxe*vgft7 .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 anq:. g y, m;h c00tx/rtqk5dvbl RLC 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 the circuit increases if R inl.w) 4ppvst jv6hb6 w:creases. When is this statement true? tw v:vjpb .lpw4)6sh6

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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 ofe42 t w3o hl0kmx t6kzq7sf)r0 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. w7d;(7l7v0qh kgurwlThe 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 an LRC 1-q:()u0kcy8 ujac unq/msj5lh k8 a iseries circuit, the resonant freuch5u(l1 uaq mk iay8- jk8:/0scqj)nquency 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 r 7 55o zgw6n jibdyuj es4iy73v)myc+;esonance,

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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 cn;jni q(km;3li7 /zdtk*9 /dr i pk+qbircuit 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 uniforckq r*d6wi 03nm magnetic field of 0.20 T. Find the6d nc0kiqr3w* 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.cin 3 ss 92/i 9e.cggtcmcw6/v10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetce w 9//vg.cstgc is 23ic69nmic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.1) dvh1)-onq zs0 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the mag)nv )1dh oq-sznetic 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 s7qc-. tj7v1ezjsac u)ingle 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 froq-092hyx (mn ssrk uiuuu+.*zm $4.0 \times 10^{-5} \; Wb$ 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 wie - uplxgk1oc av h49mwg59z;4 f/:rnire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to theevko1 r ml4nf;/g-9 u ga4zcxh9w5p :i 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 wiz ayd11- dn.qtth 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns ant qvp :+7tecv+.iwx a*+o ;pmnd 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 h-0jz9q .zzryza1a u3re/*efhz qid :4orizontally at a location where the dow/ z -rf zeu*3aqd:.z0ehzrqy9ij1 4aznward component 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 rotatx-j i82h;egz6lq 7 1wncchf, fdex2.ees at a constant angular velocity o7, 86q.1cfxnie-z hh2 xlefjdwcg; e2 f 2.0 rad/s about 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 t4msjfny+w+8 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 consiat0 vv ffzq6bk7)6:l7 zs*zqciv 9o z6sts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop-y: xsf*nels 1zabjgk,2.y 9e is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about a e*bf.x,sg:y kes12-najzly9 n 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 ojq-;jnh z5/c3t/yto 5s*xo-9 gp s fkwf 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 output of 12 V ,gbi0 ah+*muv maximum when rotated at 60 Hzgu+*ha 0bmi v,. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator ..kvhmx7.d et 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 DC2w sp,7noejc,ys a(i: motor have a resistance 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 opera s,m g ru h.,2qid0h. 9jsby(7nw0hukftes on 120 V AC, and when running at full speed it gen( 0i m dyfghusu7.9nkw,2 hjq0rhbs.,erates 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 (l.dv m8g +olvy/qi9l is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up curre8ydil gml+ 9l/voq(v. nt?

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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 qm* 6k zvrn..tsk.)r-1zc vfzis connected to a 24-V power supply. The operating current is 1.0 A at fkzv. szc. .-qn6v k*frzm1tr)ull 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 to a 24-V power lp jy)vpq,,- nk)hj0x k+-n/oy ce r/hsupply. The operating current is 1.0jy,pxnl-qnc/)h) /j ve kkop0 +h-y ,r 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 ne:xi0bn,4b )a l t i:/ny-mbohveded to reduce 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 waatn6c1 2a;ptransformer causes 14 A to flow in the secondary.1na atapc62; w 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 in a 110-V primary if thq898.3up;;83ylmc qpgi /x vjtb t bvxe 24-V secondary has 100 turnx39mjp g ;. qyutt;iv qlbx88/cbp8v3 s?

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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 coil and afoljwcgu3gruh 1 rf 5xj*6 ,71 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is r gg1wf3f hou65r x*jcl7 1j,uthe 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 of30lu;yg 6s8h;h lsfcs a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secgs hl;lufsh3c08 6;y sondary?

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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.n2/exw.bf:h th l 6nh -+fot3jt9f(mpx 0u0 nw0 mA. The primarn6t nft .tu0f 2jm39fx/:x bwwh+o0 e (phlnh-y coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer hqsk g:a r(j5i,2a4sjc 4iog2xas 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to :sa 4sxgkr5 q4j,oic(2jig 2athe primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on wu8(fxma ;k x3its secondary coil. If 120 V at 2.0 A is applied to;m(xx 3f 8auwk 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 100 turns and its secondaryrfp 36v6j7tf,;gxp bw has 200 turns. If the input current at the primary is 100 A, we can expect the output curr;3rf7p gvtxf6 bw6j,pent 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 i2;i82.cmpyn +fsu j6 h7uznm-ejj+w fts secondary has 200 turns. If the input voltage to the primary is -+h+wepynmu7 n28ffz .s mij2jc 6uj ;100 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 turn-6hpgvgv :c; n0rqon-s and its secondary has 200 turns. If the power inpu6g g-p;n0-hnvorc : vqt to the primary is 100 W, we can expect the power 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 is usually ste 3urycwsaxpvh5kke 5789a 51qpped up to 4500 V by a transformer and transmitted through a power line of total re pqs7a3a8h x5ycku5rve9k1w 5sistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usua 3ujlsb;ox 7-,n: nx.4wswlqylly 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 lin3q;-4ws7b osnx:ul ln,jx. w ye.

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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 cu8qz68gh;uff6yjt fsq0; 1q o mtl9kw/rrent 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 the voltage is not s ltqtkw/fh86s0 zj qy891 fmg;6 fqu;otepped 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. :/wfx ;1* sf0pahf0f vp dg1ehuyo7y1A 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 tre gf pyuo:170a1/h;hdwsvf*y1f0fp xansformer 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 res.3m6six eiln+istance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss d6 nl.iim sx+e3ue 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 down a 6-W line at 100dx5qxo qd 7d4/0 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 10xq7x 5ddoqd/400 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 tf/q.-br cmy5;c p(u kro be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a tm uy bk(;-rr. qccf5/pransformer 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*f3)b qlj2h.x.irs slrqe p 3: of 5.0 A. How much energy is stored in the coil's magnetic fielljrs l.) 2s:ihx3 * .febqqpr3d?

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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. What is thw,7a upw;i -v /p,vnshis circuit's tim ;-n,h7wui,sv/ wp vpae 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 circul 3x / ,7qqht97.nxv4leb kuqpit 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 ACrrzp jzv8h(.(hvw l .grd3f.wd7 ay :4 outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 1hg mpu)x9h,s ;20-V AC outlet. What is the resistance of the lamp?sh9g ,hu x)mp;

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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 coxi s o/+s/tu3jnnected to a 120-V ac power supply. What is the peak currensjo/ix+ 3su /tt 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 connq; wywqaa,e- 7 .ockl7 .do6pnected to a 120-V ac power supply. What is the power dissipated in l.7y q.;d,ac p nwe-oq6woa7kthe 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 resi(jgxwywmfk7 cn) +/8l stor 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 re o5g 86e3-),myofco4nhvzkl tsistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resisto vs;:ot9kw.lc r 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-mH3:oefdz0 9 gvxj9lsc kj6,jx4 inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1000 Hjfr f,m;:wvy8pth8-w6:i bva/mf/kv 0xq cl 1z?

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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 co.vp(kw8n.ykll wc2 9iyr9z8oil 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 necessarib:ry, h/)xlj y for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at l ,a61xj e)mq . xw.ct8zhy4lda frequency of 20 kHz is apzh41..dqcl,6 jte axyx m 8lw)plied 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 c z0pya cer -(nur2c4jcmw;zf (w 8)m6a 2.50-mH coil due to a 110-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 capacito6:e:m96 vjn6q6zmk i9ku 6vy wvwyyb*r 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 p,:b.zi)nnoano d ,o8)p3cvb W 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 10si5ad;yf2 dfko1 b6 )o-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be 10xfr8unabz3n k:db x3pd2-: d+ 0 Wpfdd :+zx8rud :xn3bnk2-3a b ?

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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 5.0 V;m+w *3:ixk3lzvpeul ?

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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 Wcp:x-/jnpw b 5 resistance, 15.0 W inductive reactance, and 1 5xjcn pb/pw-:0.0 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 resistor, 20-mH coil, and 1.0-iog(n q2hv a q65ip,t)mF capacitor are con2i56hgq,)vnoia t(qp nected 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 100fub01pd2 0qke-W resistor, 20-mH coil, and 1.0-mF capdfk10e2q0 u pbacitor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor ism.t7i6 zjq :wzna6+cd-un0t:dhhz f: connected in series with a 20-mH inductor, what is the impedance at m ::q0-. jzd 6n6n:tz7fic h+w udzhat1000 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 cj+g2 y6;t8yf *jzov+ixo3c vronnected in series with a 20-mH inductor, what is the phase angle acy gv *rjo8 ty;of+263v+x jizt 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 ,s/3 lqmzt9cd8 te3cwv 0r+sqs.2c fkin a series circuit with a 20-mH coil and 1.0-mF capacitor forckcwm.3seltt 3, 0s vds crq+8z2/f9q 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 is needed in series with a 100-W resistor aniuw9-mhof- xa+no w nxz99,di *9 qoj+d 15-mH coil to get a to z+nhu9a- x-9xw9odo fnjm i 9o,qwi+*tal impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz forz i2v-z;u /hgaliv6 n+4(j sko a total impedanc-v4i;gj(ho/s 6v ziz2k nul+ae of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resiczxah1q 29 usr -7zk 95wsz(lxstor at 1.0-MHz for a total impedance uz 7-xclqh 9srz5 za21sk(w9x 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 conqa a +;wx:*cyc,q gng225 xpjunected in series with a 20-mF capacitor. What is the impedance +j u2x 2gqaq ay*c:cgp5x,n w;at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.-fymcl q0m*4z*bugxw )2l x/c0 kHz for a totalwu4fl-/0l*zbgmycm*qx x c 2) impedance 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 zznjq+9qx/qsmb q2 .hv7g o;8 a 10-mF capacitor at 1.0 kHz for a phase angl./; ghqqjz 8q+s2vnxbz9m7qoe 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 jrocp,g. ,xj.cj3z3u for a total impedance of z.jjo,j3c .,u x cpgr345 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 1205 oom s9f mdj+r sth),ft() p5w67rk*m1 ffafe Hz. What is the phasmk9 m* s fe)foff)tf h1 5ra7op5 d+wsr6(tj,me 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 and 1500 Hz ifm7nuf/,+ -xlia-of hu)xv t( p a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in fnlv ,- u-)i+ opmtha( /f7uxxseries?

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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 qhv6 4n3gx+rd10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. Whaqv6dg3xhn4 r +t 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 cap7miexcwa. 2(d0-o zsj b +r bu0lu8;vwjlv n9:acitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows inxe rwcl.00miz-7jbo+:j val ; bswu982n vud( 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 :r:8ultnsde6 -W resistor, a 10-mF capacitor, and a 0s:6de:nlt r8 u.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is neces+p:wf pn/.jw psary in series with a 500-W resistor for a phase angle of+n:ppw.p f w/j $40^{\circ}$ 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 Wb4.tecl,l 6odn ; rfw,1cy-5mp/ sxcv , L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from th;b,v 1cwxst -/,y 4l5fdml6. rpcconee 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 12a gy+ 3gn and6t*/hna2.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circu /+ayn 32n a*n6dgghtait 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 ACh3nbb*k9h7dwoj4 k+r circuit 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 resistance of 30 Wqd kbvr/t58l: wh8gmp ba1,0 ,y:jhkz. What is the power f hjrl0:5,yzdk1 m tpakbqw :,88v gh/bactor?

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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 s rgib 0ge(ax,;jo y-c3,tj oi/eries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected tob io,jxoyeg-a /it c;3,gr0j ( 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 yj:7, xs*psy dsrbzm kb641;xa 1.0-mF capacitor and a 15-mH coil in series?ys k b4 67d, x:*xmbsj;zrpsy1

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is ne1w cjori7, iis91p7xj eded in series with a 4.7-mF capacitor for a resonant frequency 9c j71p7iwisx r1 ij,oof 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 induck;l;xl l n1q:itor for a resonant frequency;lk 1nql: xi;l of 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 placed in ser4f 9f cnm8nua;tbl (d(d/e9aawg a+)gies with a 30-W resistor and a 40-mH coil if the resonant frequency a+8ln9f9nacddg (a mute 4)/;fgb (awof the circuit is to be 1000 Hz?

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