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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 arg(f10(sfhvaq9y in sns+ex/ 7e units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of indu9 9q vv z8me*uzy)2 o ab;ly).3einwpkction 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 coil produces what kind of chane d-.d0j (npkt6 .afg .;za:aky u1bwrge on the ak.tk ;z0 .(r.wdb dy:1u6fjapa n-ge 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 a loop of wire produces wham/1,bgqr6q(hff y zozg) n 3kkx;p1l .t kind of change on the pz 3 kggy/f16rkn1 )fmhlxo,(qq.bz ; 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 k 295swiba bckwc6(bjt+pz2(d ind of change on the inducswb2(c9pkzbadt j w65 2c i+b(ed $emf$, 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 fr)e f bfmcc ,*i4x7eeu/om a magnetic 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 indu8r8 jit( 6wdtlced current in a conductor will be that which tends to produce which of the follot8dlw j( tir68wing effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar maqn 5w rvlb4n-e ga+an6m 3;bb+gnet is held above its center with its north pole pointing down. The stationary magnn4lnqm b;gw +n5 bba-3 arv+e6et 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 abover rn ku)in +j55xu7q(qdg7t 0p its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (whenrni 70 p5n qt x7grk)dq(5u+uj 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 whglw p;ldv)6bzuxn9z/imk1-, d u0h, yere the magnetic field vector points straight up. The magnxpdwu,dyg);li-ub zlv60 h1 k/ mz 9n,etic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic field vectvmv.o7/u oc8r or points straight/8oo.v7u vc mr up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizoni: sqm.ibt,h6 tal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in t6.qmsi:hbi,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 lye*o/ m;xkb:;xid z2a ies on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed:2e ;xxiazkdoby ;/m* 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 enteringq j* k16inl6ig first. As the north pole enters the wire, the induced current will bn6ig1i *kqj6l e (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 coby cy2 )p 6czm0vvbo -.6bkve3nstant angular speed about an axis whose direction can be varied. In a region where a uniform mkbv6p 0be mb.cz6y3)o 2vyv-c agnetic field points 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 ppz yw+o(j08 o (kbyd*angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points str8dyb*o p+jkw((p 0yz oaight 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.bh4lw2ok 3x5l+o fc-n
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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 thrav2nc +3f2 f.s+tzkc.qesk9 at 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 magne*mn tmt,kg7xla(2 8u rtic 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 moved northward at con+1w untv d j4voi zor3t/mj(86stant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acro+(zwj8d1ji un63 torvo v4tm/ ss the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates fe rr;rxq216)rcv uws:ioo., 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 traxwc/ibkpwn *u+0md 88nsforms

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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 througha/p3n, 3p o l5p*ealym),x izb6cqyx0 60 revolutions each second. The frequency of t5lnb0zyilxp6oy/a e3qx,3c, pam) *phe $emf$ 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 de- s woi0u4 tyqd5m wejktw42r fx1*;1pvice 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 dawk s9*us3 f moyg l/w66l5xi:evice 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 more loops than the primary na6urf) ( slq9coil then ifs n) (lq6rua9t 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 se5z 0hm: c8tu20ru56 nr+kf ycnmkb +necondary coil then it is auh5zkf n+ru m : t5mnycrc820k0 6nbe+

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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 inpus.alxu i6 bw7ahku 4s5*,wxh 1t

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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 resonanjq -xx q0dt5-bt circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an idet t/i/ ;lnene4al battery of constant terminal voltage. At the moment contact /nt/l e;4eitn 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 a (0 bwvc b*li1 u,yo07sljrssh)2u+tore connected in series to an ideal battery of constant terminal voltage. At the moment contact is mad(0bw2jvo r0+s7)lcob 1hultiu,s y s*e 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 connected to u:lpe2sa-5f k.fwonbtyj - 4.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 andu.p860 xbqpbos/fw4p resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The qe) ba ycfps 1g-deabz 8,7 eci.+/7lztime constant for the circuit represents the time required for te bzz1 iesf7 l .gbdap)7y+/e ,-a8cqche 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 to a battery. The batz+ a2z6y e17 h9a nxnev8dh.fitery is suddenly removed from the circuit. The time conz17nyn zdfi8.ae 2ev+h ah6x9stant 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 followingmq3 c00 +qlvxs/or0f xaf)wr) have 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 to8kv/cr t--f ail 2ruq* an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuitee8 zso k + :42iitmlaff)jl9., the currenteio f+ 92e4azfl. 8jksl:itm)

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactan79 erkdj2y f1wce in an ac circuit changes by what factor when the frequency is jrk7ew21 yf d9tripled?

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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 voltanx.w f ;0x/;h/awxi rcge across an inductor is doubled, the inductive reaca x/;iw 0;xr.n h/wfxctance 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 acv,x x +z/wfmwo;j4;yx ross an inductor approaches zero, the inductive reactance of that w, ;+w;/ xxyofxj4mvzcoil

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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 cur)4ec/ ( pm2ah:nnxobx rentnam : xno/ch4 (2)xbep

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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 the fer 2q:eegc (d(idu2le 3: k4uurequenui3drg22e4c(q:dee (:eukl u cy 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 across8fxx dgtidzll+;7enp5824*y8n zn bh a capacitor approaches zero, the capacitive reactance of thatn8dfz*2ghntyxn bd7 l;5+8z84p l x ie 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 07x04 bfe dn*;3xp2ab gx bfoxinductor and capacitor in a RLC series circ 0 g 2*xba7xbno;fpf4xb3e 0dxuit?

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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*+ x mtt-pdi6q 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 i+nha ,s*,c ;.ad7x zwhn2 zkxef R increases. Whxn;adce+nh, *hsz,72a wk xz.en is this 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. The impedance of the circuit increus: 9g ur;e wc7x (impcs4ow1tvn1u:/ ases 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 cin0powj:h zb 66rcuit. The 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(viit2,1k z +mn2eutz double in an LRC series circuit, the resonant fru tzi+e(2 z1 ,2ikmtvnequency 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 res.vs n/ od- 1hwr9f1azkonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs ncf(gisn4 c* 8when

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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 0.10zs6s w/r 3avo5 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of theazv 5/ow6s3s r loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magneto. d6 cy ghid(x,o(9hlic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and dix(g69y ( co.,olh dhthe 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 g86 ex;eilg6g 8+mwoais rotating in a uniform magnetic field of 0.20 T. Fe8g8eg6wxm+ al ;go i6ind the magnetic flux through the loop when the plane of the 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 an adjustable single loct2i2w i;otg efv):+j;bmy,3vdse c/op 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 fropd/ivjniyi x )w* fas+5x+09om $4.0 \times 10^{-5} \; Wb$ 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 wh*;l8m)3 g1s ekwzf7fkn,q tiire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the planez ,f qt1w8elmhk; gkn*isf3)7 of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and a(*u(l ,(kspgiilg1t z 6hj1q xn 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 an(x:4pw it4xand area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a locatio) 7e w;zjsr3nqn where the downward compojqz73);sew nrnent 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 th/bb0y oja;lj6at is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends whilebl6bo ajjy0/; 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 6t,0jm2zuhkz.pkhru3(.z cz 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 100i+ 1k0j kezfc6 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 rectaneur2f2ybb3r 6)gyk: fgular 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 Tkf yg62bry fre3):ub 2, 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 q0p4 xp cmvc4c whw0nt58w (c(26ulcx100 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 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*e; v9w3qdct0 rrg ils (5bbs8 12 V maximum when rotated at 60 Hz. 0w qs g83 *is9d;crrtlveb5(bA 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 with a maximuw- :2s:t(oeyt isafv6r1r2qtm $emf$ 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 resistow(jt o;la.h+ ance 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 m ou +.+-5o.hdzgev 0phbli(-xtjmru6otor operates on 120 V AC, and when running at full spee pi+ou6h(-0rd. uh mljxz.- +b5ovet gd it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power sdh*nmbxm5sb(qp xn+tj 11 j)8upply. The operating current is 1.0 A. Whjbh1p8*mtnmq5xb(1 dnj x+) sat is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connectedui/x l0j 1nos8y0kbwkq6*c o0 to a 24-V power supply. The operating current is 1.0 A j0*o1yx w0ck ub6 o8slq/kn0iat 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 to a 24-V power 4 r*epqc z6/cjsupply. The operatrp46qce c* j/zing 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 primara2u+y/ mvi)zu/7 b wgqy voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the secob9)l9o n3wo0is1 g ze15xrfr mndary. How many turns are in txznir0f) 3m1w19b5se9r lgoohe 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 manyk3cw(u+l vs ml+/n ;pz turns are necessary in a 110-V primary if the 24-V secon l+wl+k/v unzs3 mpc(;dary 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 primary coil and a 2000-turnmy h1wuma+wd/t2chq v9k /i -9 secondary coil. If the curren/h91tv+ /9i wuwqydkc ma2m -ht in the secondary 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 the primary of a transformer. y )0(rfm5btjy Assuming 100% efficiency, how many amps at y(fbrm5 j) yt024 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA/6 qq0 neexva2. The primary coil operates on 120 qax0 ev e/6qn2V. 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 turns on its primary/5ujvp(eh4fwxz t ):i coil and 300 turns on its secondary coil. Ifzi) u5j :pwf/(t4evhx 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and kzx klnise 9)7r5uwq 3k502ja 300 turns on its secondary coil. If 120 V at 2.0 Aek70u 3i k qkslr5)n925 jzwax 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 transformer has 100j7romwy 5ed 5bt r7:q4 turns and its secondary has 200 turns. If the input current at th74y o dmbr5jwert57q: e primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and itsqkw pgl9n6u ;( 6cod 6)uh9cuu secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the se6doulucnpc )gq6u9k(; 9 6 huwcondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its sx1sl jee kz md;ag0:sa :*92bpb3f :vvecondary has 200 turns. If the power input to the prim13 m;xaf b zja:v e:*vsb2sl:dk9e0gpary 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 12t- kckmz7btc 9x;9q.wpj:kp6iv ep07 0 V. The voltage is usually stepped up 9m 9zwkv07ct-pktpe.b :ik6;xjqc7p to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually s mkd;2 woxu zrk)t3) a.v.k kw4pww2b.tepped up to 4500 V by a transformer and transmitted through a powerw;2xoz)w .kwmrbvkt2uwkkp. 3 )da4. line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage ipw0rfw08u y*cs usually stepped up to 4500 V by a transformer and transmitted through a power line of totauy*8w0 rwfc p0l 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 long6zao3q:t qb1x has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order 36 1tqa:xzb qoto 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 would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A (m r.aivazt 7-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 energy im.r(tz i-a v7as 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 transmittek ,j9 yh,zi(pld down a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead ofikp,yl j,9(h z at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be t0zx* m7;vwdhwvf; :-r.0 n v.wsq cqrtransmitted on a line with resistance of 0.60 W. To what voltage must the generarhtwrdwmv0zw 7.n f :*vcqxqv.s;;0- tor output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How mucahq ,af0w /o 6poux6 ao,;k75fe iqg*wh energy is stored in the coil's magnetic fiwfqa*e765wg ,,oo/ io0pfahx kq6; aueld?

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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 res4e h-o vxok*h*istor and an 18-H inductor. What is this circuit's time consto*4 hh ke-vx*oant?

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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 r).njpj pb+ney429 ytz ms 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. What is the peak bno)yr8om6 8 f8f mu7fcurrent?

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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 is the resistance of 3jgm2s +ffa4,q fn j2pthe lamp+sgf3 2nf, jm jp4a2qf?

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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.1s;qxdm ddw,i/cqk4* What is the peak current through the resi;kddmi, c/wqd41x *s qstor?

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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. * y5obza0dfv ac power supply. What is the power dissipated ifbd5a*y0ozv. n 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 b yv;x/9vrjs4e +2i ay50-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 resist0t d5we-u yjy(z: n2qdor 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 rlr-6x.6knn e wesistor 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 1.0gltbfi pk+7rpi 6.(c 7z8kuu ;-mH 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 reac7 iy50nix 1/fziv lkl6tance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inducti qyp*k3v7 6gtu0m1xk nve 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 reac4 0(e37rx+k fgrr(zzd ys wt,id4gvz:tance 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 n ohkvoydmt:5) d+1z dj.i3z7 AC at a frequency of 20 kHz is applied to d .nzv +51jy: )todo73h izdmkit?

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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 sour .i3 b wgddjp)n :usar1s9-mw *+sy9ros u(h)cce?

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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 oe 5pf 2ndbic: z1l*aa5f a 4.7-mF capacitor 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 10x)v(xjt c3vo4 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactg4s d x3*mpn,rc sg14/le pz1sance 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-mFyg e*cul u/(btvs7f;:w o f*o. capacitor be 100 W?v:(;/o.tbu uf yg**7 fosclew

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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 throughsrcxi be26.- i a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance 1vvo 98cea/pe of an ac series circuit with 12.0 W resistance, 15.0 W inductivvo1vc /pe 9a8ee reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mHr95b owv- zai6 coil, and 1.0-mF ca65z va9 -rbiwopacitor are 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 if a 100-W resistor, 20-mH 771mi wj2h lpucoil, and 1.0-mF capa7 uhw2p 1l7jimcitor 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 is connected ingv/-gdeqn v88 series with a 20-mH inductor, what is the impedance at 1000 Hz?v8ng vd 8qge-/

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductw wonn0 tv/s a23+d4-5oi nv1qfvks;zor, what is the phase angle at 1000 Hzs ;z52k1i3vwv qn4-wfvnd/o a+os0n t?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF capacqktp)2q3fxs .0v(;kbo tj o f:itor fojxqf (kq t:20tk3vs.opf ;bo)r 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 followingxam6( dce; xp) capacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110c);xaxd p6m(e 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 2h8z2vq.phj 2yri.e u 450-mH inductor at 5000 Hz for a total impedanh8v.h2 jrz2 iqey2.p uce 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 is6w;vpo 3-bjqszbi t 0ypx9 c+8f .+ej*u rtl9n series with a 100-kW resistor at 1.0-MHz for a total s9 +qpe-vx rsj y ;b3t*fciu0obwp.9 +6 8ltzjimpedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capaciiq x(ghs0ybv+/2i 5w utor. What is the impedanc i(yu0/ x +2g5isbvhqwe 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 h-u4u t p9,q m j3/pbkr:zp2yhseries with a 10-mF capacitor at 1.0 kHz for a total impedanuz4, qh2 pbpph -/t:rk9yum3 jce 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 intwa/d pssm7o7; 2otfq sc -7*p series with a 10-mF capacitor at 1.0 kHz for a phase w7cp sosm-7odpts;7qa 2t f/*angle 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 resisuz3uzf p.3dl68b i2tofyq.layb,)n7 tor at 1.0 kHz for a total impeda n38z7 liypbufu)l,b63t f2ya. z.doqnce of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. (r1.qec 8dr 5os)cg 6x9bvk04w yse omWhat is the phase6cr(1voqyx) k4gwb058 mde er9. ocss 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 if a 100-W resingohz v y6)2z6stor, 20-mH coil, and 1.0-mF capacitor are connected62hozz6 g)v ny 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 resjo7q:,ww* yn4th-w je istor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120y ,t:j- wow4enqjh7 w*-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an inle6 7qcu nb(, :thj68duaq:pa ductor ojbqp( qe7tchun6:u a d,l8a 6:f inductive 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 resistor, a32up we b zisuw:-kj*2vb:zp/f+vv- d 10-mF ce:3vw zb2 /db2puu pvs:-+ ji*vf-z kwapacitor, and a 0.45-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 necessary in series with a 500-W resistoh fnm(ui;n-c47 jyup 9i;kfdh km9v56r for a phase angle of mf9u yc ;ki(-67inhm4pun9 jkd5 h;vf$40^{\circ}$ 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 fn nvxu0qq7b: q:-dpu-. /z,slaho wc* requency should the circuit be driven in order to have maximum power transferred from the drivinvxqqhsqn w,7:b0nc-.* /laz:p uu- o dg 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 resistance, 15.0u w- nh7 w5nmtx3*d.ht W inductive reactance, and 10.0 W capacitive reactance,t.mn-wut *d3 nxh5w 7h 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 jfv49 7jsl.axhf12u o 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 c8f,.edrgjcni* d*hq 7*,nt7jqr(r r has an impedance of 60 W and a resistance of 30 W. What is the power frg qr7c7,q8f jnhdrt**. ,eci*djn( ractor?

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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 brnr93 acg*)sw2)dfh e tsc3 xtf 59+dseries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, sr)c+betnd 3wcs9h 5x 3fg) d*r a9t2fwhen 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 frequencyd* l-of- k4brm32o)*mt zchkb of a 1.0-mF capacitor and a 15-mH coil in series?okr2 hcmm 3*ofl 4zt*-bkb-)d

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitorpkg* : fp7fg(z for a resonant frequenz:f(k pf *7gpgcy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor fo l458 5 -*rkll0cagu1mpevox or a resonant frequency of 1000 e*8m xkl05-4 gr1opalco5lvuHz?

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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 repb+96 odz l.n)ha: lbum gm04osistor and a 40-mH coil if the resonant frequency of the circuitb+.d u p0nm9l6)omh zgo4:lba is to be 1000 Hz?

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