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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 magnetic flux except7d -swc hnqhek 979up6

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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 xb9f36b lpbxfi+5r4m/6e1h wd ygu:p 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 coil produces what u )d ,c nk3ui9py p:y;w:tonp6kind of change on the 96cy uipdowu:nnk;t p3:py) , 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 fiel0kxv0c ksk(5v:(ap fxyo 7*;.quf hrld through a loop of wire produces what kind lv f7;r0*5qp (vkkf0x. uyahcs:k x(oof change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on thbo 8)vao*44sv l9m9qpnl 0gege induced9l4pe )b9 goglv084s qon av*m $emf$, 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 mag9qlva1t-0m(nmi 6fa/ g lpru:netic 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 currene sa bjr-y5y)gzr6 ms;1 okd92t in a conductor will be that which tend r1zs2k gy5r;syaoebjd )9m6 -s 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 tal( q wzvw87q4sble. A bar magnet is held above its center with its north pole pointing down. The stationary magwlz q7sv4wq (8net 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 table. A bar magnet is held above xysmtcc) nc0)t/hu sh gc. y 0s0l0(8aits center with its north pole pointing down, and released. As it approaches the coil, l.c0(sct0sc ys)x8ymh) 0ut 0a/hcng the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a z2e7ozg-4hwo table top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When view4zeo2zgh w- 7oed 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 topd+* .e 7jhrfte in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the diref7de+e * hj.trction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table - y1rr/n-v 2 etpg3v(svq: fjatop 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 afq-jgry2: 3/(v v-ent svap r1s 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-v qcuiy;o s3vw5*d8u.increasing current northward. Two coils of wire lie 3.wsy;d q uuvc5 8v*ioflat 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 entering first.i )kim-,pkbv +kz 8o/y As the north pole enters the wire, the induced currentkk-+ b oip,vk8iy)mz / 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 cjp )eoe o,1yu688efg aonstant 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 orientation of the loop's axis of) 81jeof y6oge8p, aeu 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 r cvs2iv;t) .l0q j6reootated 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 orientation of thel q2s iro;60ctejv).v 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.3v qhgg1(5)0fu xv 8 hcwlxt1n*hbo5j
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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 thatm8o-*et*z +tp rbn, cs 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 magf:6dqp3hsav+tlfnk 5, 5.e zz netic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is movedljqsb9rn+b maz 9q0: ) northward at constant velo9+rsl0bbq): a 9mjzqncity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar w dqs2h ,)bn,vrotates 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 transf (83*a:f3tpionyrjfblz j cf- -p*k9auo 7a3zorms

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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 rqew r)e4- qi+ nz1pj:;enzph -evolutions each second. The frequency of th1z4 ; qh) :ie-p+enzqpewnr-j e $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used k:w16l e ib*j.l h2 gsk+ropd da.ua4/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 deviceu9 o6vzqu1l-cs awdsc xa/rk*55kto -(*lz v( 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 seconda1s wjhbcur 1*tfn,i b3 tt296chg;yb: ry coil contains more loops than the primary coil theisbbb2ncjtu1:gyt3r 96 1*hf t h,;wcn 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 h7mn4uqaf*sci my19 u vn,*ng5g0 :cvcoil q miavn sgc7h5uf,cn*g01nv4* uy9m: then 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 pp.4v1t fbxa.c r7y kk90r1b bgower 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 resona* fwmazx(5+dknt circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor9/emczx6 iq:l6t ad4dg evrp1)z d*x) are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the batt*a/dxdpi6 tm)4 ):9qz1l6gevdzx c e rery, 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 indu w z6yw*jbt0j1ctor are connected in series to an ideal battery of constant terminal voltage. At the wyw 6t*jjb1z0moment 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 )0 i;jmj ;w0u bb9o)uz05ghxri cus0i with inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the 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 contkrmjdc; 47 ,3gqf8wa4j7 z mpgd2+nmnected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery.e +vsoh )mra:1 The time constant for the circuit represents the time required foa) mr h:1+seovr 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 indu 4inwa7ju4vi6td-n++ nnuti+ctor are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for tnn 4u+tda nvn7w j6tii +-4ui+he current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units ehnk hmgdx4u.8q 9ly1s 8,5srnxcept:

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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. ig(z-:(izq k oOn 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 an4bfk6lk2dp;;sqo *z p AC power supply. In this circuit, the currentpq4;2 ; s*kpb 6okdlzf

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by xf :;iqqfl5+fg) iikyy k r3*-what factor when the frequency is tripl ig* kl-q ki+fi;xr3fq) :yyf5ed?

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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 -xbi 5 q+kweea q;46ukdoubled, the inductive reactanq-w5au;qxe4 b 6i ke+kce 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 dtw-*.xn8hxvxj/ q 9xacross an inductor approaches zero, the inductive reactance of that coixvh* x.jx -ndx/qwt89 l

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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, the currz:a v.e48 aet *-- tgp;jkrt3hdxgl6eent zt -xg-varegh3eet8tpj* 6.:;d 4ka l

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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 changesc3g wn nnjio,q2-x .4i by what factor when the frequency x3n-.gion,2cq4ij nw is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the capaxv +wvv.d:( oncitivenx: v(wvo.v d+ 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 volta*wz)z0 mzvte8 ges of the inductor and capacitor in a RLC series ciwtev)8z*z m0z rcuit?

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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 die-p(2:v8f6gbn;o ga :gyrkan 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 circ57yp -fg -tydxuit increases if R increases. When is this statement tr7f-txgyy5d- p ue?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circl9oqmip /81-qfnkrg2u8qed+ uit 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 th syfwbm nak/w:m5);- ue 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) k1a ubm3ka. zb -gosm5mui)7 in an LRC series circuit, the resonok1m b ami) ga.m-bu5s3k)z7 uant 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 applpov3pw2ci0g .s0 ohelr,awn g/1pf7+c: 8da zied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLCc7b2fd2 2o68untfaec circuit 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 uniforeu1zs tk ;(pusxff )tnh7+1 q:m magnetic field of 0.20 T. Findphf7 ;nkxt t( +z1: sqef1usu) the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of rad0q/bdh (2scisius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the mc 2(si/qb0 hsdagnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotav7+2 iye8x awh1,urfxok5 6syting in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of tf,i8shv wx7xa2 yo1reky6+u 5he loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an3j-.w d(xxfl 2 d8hmno7zt4mb 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 coii 7p6g3iy l7tto3uih 4l 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 with sides 18 cm. A pd-hbw93c9w uuniform magnetic field is applied perpendicular to the plane of the coil. If thew up9hbc3 d9-w 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 ar+iix41gs1con ea 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 and aream4o :.rp:f+ns a( *,bxei ybka $0.20 \; m^{2}$ 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 horizontall-5bxe( g nwer0y at a location where the downward compon0gx(ew ne5b -rent 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 rotat m t/u3zbvz8u/es at a constant angular velocity of 2.0 rad/s about a vvu8/z3 mtzu/bertical 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 rtta o03dd x9::d pop(50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wsp*8 h +llhov1ire 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 rectangula1qb sq(xy8(:unl c/l cr loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output vol8( clbn/s1cqqx (ul y:tage 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 luhkq mb /h3zfqo) *11ga yz+0area $0.090 \; m^{2}$ 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 p1a,0u pwo5iswith an output of 12 V maximum when rotate5 a w,s0pp1uiod at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a genera(cb:z0gr o5fytor 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 r4pkg68sa w+qa 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 5 hqv:rw0zh1y 6.00 W. The motor operates on 120 V AC, ary5wqvh: 0 1zhnd when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistal;qe3-smxf ig (gia5; nce 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up 5xifa ;3;g(g lsi- eqmcurrent?

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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 res (3dh7vxd (kewistance 6.0 W is connected to a 24-V power supply. The operating current is 1.kvw3(dxhe7 ( d0 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(d k1aegz);3 zscn3d x W is connected to a 24-V power supply. The operating current is 1.0 A at 3 zdxnas3kg(d c;ze1)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 ma*n0+wn,q bito 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 t8 yxdyyx(ri xl t.d14 3i14tgsransformer causes 14 A to flow in the secondary. How many turns ysx.diy x4(yg8 1itl1t4r3dx 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 6(y 68drsdfzj many turns are necessary in a 110-V primary if the 24-V seconds6 dz86yf r(jdary 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 prik pyjjg3 c*(lgj/**ximary coil and a 2000-turn secondary coil. If the current in the sec p3jygx(g* * kjli*/jcondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in tf7:au, p kdve)he primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the seca)efd v:k7, puondary?

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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 4su gy3q8 a nkm3t*hb2ww+al( mA. The primary coil s+g42l3 a ukb3q(mwwy8*anth 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 has 60 tu x/y*m0elzk ve2fu.0q rns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the seex.2veyul zf0 k0*q/ mcondary?

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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 tukf;s wkp +5a g0+grm7urns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what curre0fg p;5m+s gkwr7 kau+nt 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 gb ,.k)-d.+r hsq: d6xifu ylzhas 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current,h by .kr:xlu).fqsdi+6-dgz 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 seq 5- )mi.abqnocondary has 200 turns. If the input voltagmn- q5i a.oq)be to the primary is 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 turns an dm dyuv0unf. +k :p7la-(tw3pd its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power outpdp3d. 7va0-m k+p tu(uf l:wnyut 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 stepped 4p2pul. u.rngg h9pk* up to 4500 V by a transformer and transmitted through a power line of total resistpn4.*g2. lpg 9uhpuk rance 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 curre7d2m30e*rs*l exie (as no 4oh7jj z3wnt at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power linojlz h2oew is 0 e3andres7j 3x*(*47me of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually steppedwl,td;k (nb u7 up to 4500 V by a transformer and transmitted through a power line of tt dk n7wu;l(b,otal 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 resistae 46cziucy65 ance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original 5c4i yec66au zenergy 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 resi9yop;f u8z(n sstance of 0.60 W. A generator produces 100 V at 70 A. In order t; spy9f u8zon(o 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 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 aw.1*1pc4w vcx) emf oot 1000 V. How much less power would be lost if the power we11pw4wo* )ofxec c.v mre 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 geneyzzpwm :cm +66rator is 440 V at 20 A. 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 transformer if the power loss in transmission is not to exceed 0.010% of t:cmw6zp+y zm 6he 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 y3nrrs/jd9/ mat . 2ydof 5.0 A. How much energy is stored in the coil's magnetic fi2yn/ a9dyjr3mts./ rdeld?

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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 s5s ;wx es)nnkq.p94 han 18-H inductor. What is this cswskeq4ph5; 9sn)nx.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 an AC circuit where the rms voltage is 12 8u 5q+lhlcf9c0 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 intqep(bxrs4;( p o a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What isu 0wn;zx(+awz knfc1 : the resistance of the lamcnf10zw :ax + znw;ku(p?

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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 currhug1u .kr.ok *n*mzv1 ent m 1hrgo.uvk*unzk*1 . through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-Vfjuiux++u x vim42c2; e:,lkn ac power supply. What is the power dissipated in thej,2m+ i:+ uxf2nce; kxuuv4 li 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 50l-e3rd sl+1 ge-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistorwdh4o7 y.l ,9(ohv9w vr.ixo g 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/e9m t lk q1bvpad)9t.b6gjy /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-mH inductor atxobxh 3x 8f90r 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 coi9, j ytf 8vx*6jbqx:vkl 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 14.0hlus ya+l1-7rgob , *x-mH coil 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 necessr rn;:u/0fsteu8ic+m 4dcym t; 2piv0ary 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 a frequency of 20 kHz21/sue;) lsz jwnkawqwhb8)0 is applied to il)whw ;sau )/wbq 1ksz j820ent?

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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 throub2xa 7x, pnndi:mi.c- gh a 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 capazq2r 6yz;szw1citor 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 t.e: +khdv7t 7r+ yguypo have 50 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 10-mb o g-pj77fey9jkkle0 j;8cw) F 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 reactanckyr1 s/gitz2 i 72q3coe of a 0.010-mF capacitor be 100 W?r 3oc 7y/ 2tqgk2isz1i

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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 5f d7807t 3yo5uoqnndmcidvy 9(q1.z l.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistancehmof suda9he1 tme-:4 *,zpr 9 x9ym;n, 15.0 W inductive reactance, and 10.0 W capacitive reacta m:ur t;4xmnhsyp9 oe ,9m1d-z*ah9ef nce?

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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 ryat6) ,dsmf;i(:7 ;trw*-a qdic y7:o kqnwijesistor, 20-mH coil, and 1.0-mF capacitor are c*j n 7adi:yqtmiws7y, ;ckfi-tqd 6r :a)(ow ;onnected 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 +-mkxt3uj .nmrvkpk2q63 9i jif a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connectedikm 2q+tux6. 3j j9kp mnrk-v3 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 ;sw*y7hjmwo )id3 + boamr)k9jrp83oconnected in series with a 20-mH inductor, what is the impedance imoopmrr3kh+db9w3ao ys jw )8 *;7j)at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in ser51t 3z:c h:cg5bxh2kc;ybdd0p d5hkzies with a 20-mH inductor, what is the phase angczkd2 c: db zc :tpdhgy5b;155h 0k3hxle 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 ne.71 1ra ( c6rjrvyj2o (xucjgjeded in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 Hz7( 2axjgj ujo 61vrycr1(.crj?

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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 a1z+oav jj u4a4c)xw/b 100-W resistor andu j1wzba+ 4xa)4/cov j 15-mH coil to 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 s ,xa/m71 fmbyberies with a 450-mH inductor at 5000 Hz for a total bbmmx17ay ,f/impedance 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 se7n8yf/vo i;up ries with a 100-kW resistor at 1.0-MHz for a total impedanciou /vf8y;7p ne 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 c -k))c9tzy,6yy 0*pmwqptjtronnected in series with a 20-mF capacitor. What is the impedance at 1000 Hcwk-p9 )0jttmy,t)y z6q ypr*z?

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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 tdgu8 g37hve11v6hxgtp 21 xcwith a 10-mF capacitor at 1.0 kHz for a total ipg2t gd 16vht1 exguhc7 v138xmpedance 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 i*sd +oh 0,u,:rmmo9*ivmte dz n series with a 10-mF capacitor at 1.0 kHz for a phase angm: ims o0m9zhuvr dde *to+,*,le 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 serief lf-t hxj,+ud5j:eymp cc403 s with a 30-W resistor at 1.0 kHz for a total impedance of5tmlcx, ej+:j-yuf c30hfd4 p 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What zzb(9d bq0x np)br f(8is the phase angl n d8xb9((z rpf)qz0bbe?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor,1q190z o8* bmztpy alf 20-mH coil, and 1.0-mF caz ly fzp1 8*ob9qma01tpacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a ha9z 12muhsm7-vrza*ms uygh.q 1a q5j 5ys 1110.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supplyr5u9h a511s v y7maq2.qammzsz s1hyju-g1* h. 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-a2yg.yqx o tt:;gy6 t capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 6. -xo;2tt:g tyyaygq110-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 RL s: 4w+;8d9zdrup8abbdhj0jkC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H indk4+u8d pj8d 9b0 :hszbj;adwr uctor, 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 necessary in series with a 50,w(+7v j/u vrrnpwntf,-qq5hy/ tn 9 b0-W resistor for a phase angle oyw+wtrn7 - rpv,n /jhnqt,u59bv/ (fqf $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequcd: jch3 /j9 + )a8zpss7uxfwmency should the circuit be driven in order to have maximum power transferred from the driw j msu7a9/d+ c:zc38s )jhfxpving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resisu; rx94 zxg6s8 exqq2dtance, 15.0 W inductive reactance, and 10.0 W capax x6dx4ez2rs;q8 gqu 9citive 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 w mai(7 o9bbfia; 0)rcis $63^{\circ}$. 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 idu*y qz-iu054bv jm6of 60 W and a resistance of 30 W. What is the power factor?5 iiuq4uyj b vd0z-*m6

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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 resi g3w b bonj.7+nr3c+cg,cgd*astor, a 10-mF capacitor, and a 0.45.3 +a3b+dgwjbn * cn,rgc gco7-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 capacitor and a 15-mH coil in ser9* 6 (2t1fdpt5 hryifpc32u7 fqkvwr vl/ m2cjies?c y tf*(q/ mcptk523fid6v79 2uwrh1l2fr vp j

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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;vfp5dnjyjn2+w ),co a 4.7-mF capacitor for a resonant frequency 5 wy,c +jv)npon2 ;jdfof 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonanl(zg0c,a9thg.to6qfw s+u u- t frequencyc6zt ht. 0aqg(u-+ s,ou9gw lf 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 series with a 30-W resisg76. gzz hv-yf9ktsh2tor and a 40-mH coil if the resonant frequz. 96z7 -ksgfthyv h2gency of the circuit is to be 1000 Hz?

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