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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 80，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://51fly.win/test80.html  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。
 作者: physics    总分: 142分  得分: _____________

答题人: 游客未登录  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 magnetbj i x)q22vbl bd);)scic 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 induck (q0.bqy eiawpjngr0ve7,j k4km.:7dgx-8 a tion 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 i8nby0at )vm *kn a coil produces what kind of change on th8bt an)0*ykm ve 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 throu0r )sdlb*no. agh a loop of wire produces what ls0)do rna.* bkind of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of/9c fni0m9mvx wire produces what kind of change on the induc 9c0imx/ fnvm9ed $emf$, 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 field ankv,;dk59 s.zlz5j g hj $emf$ 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 diro.pd ) btc3is:6 w)5kyr a-jobection of an induced current in a conductor will be that whi:6ikowrotyjc )bpa 3 5b.d )s-ch tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bam/uft :d( eeu7r magnet is held above its center with its north pole poi tuef7/u:e (mdnting down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal tab km qezm7:r ;)qmx/(vm k2k1fale. A bar magnet is held above its center with its north pole pointing dow x r:kzva )m2/7;mkmkqfm1e (qn, and released. As it approaches the coil, 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 t6xv cb +qai9otsq 6 ;g18e)arg wnn;0yable top in a region where the magnetic field vector points straight up. The magnetic fxqb6egq;g s 19na )6v;owa+tr0c y8inield 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 magh m+ pxn6 d-cj0wc8y4f+jh,le )k:pos netic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direch: coje flsp8hnx4+pkd+ y )m0jc,w-6tion 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 top i/0fe5lj q ww42r vn3qfn a region where the magnetic field points straight down. The magnetic field disappears s0f4f5q ljnw/w3vrqe2 uddenly. 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-increasingnyyw -- .vm;5r r0bodd current northward. Two coils of wire lie flat on thrm-w d-rvbo;y 0dn 5.ye 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. ,h)hbdv :mg*gAs the north pole enterg)hvgd b:*hm ,s the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wb n*gw7ge,9bvgbo -8dire is rotated at constant angular speed about an axis whose direction can be varied. I8 gb b-*o,e7gb9vndg wn a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be 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 anl ;ac3r; 2auf qgg9c.cgular 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 rotation3fc 9;q ulc2aa c.;ggr 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.vc g5o*2; hpgx7 mq1jx
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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 thrbf+b.t iq; .c 2mrdb0at an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. Thvus1sfz(c0pofmrj rga9():2j3t s/y e $emf$ 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) ilkdhtr/j 3(bh1 ixg9 o f4k++cs moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the ph3 o4t9(/fhkc+ 1gx+kbijr dl otential 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 rotates at a constant a2fm+- ey zx.rongular 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 tk)g/zsvjf/mcmn, + u6ransforms

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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. 6ymw.sy ;fn;y z0.: kekjoo3r The frequency of tmjew;6k syzroo3f.y 0kyn; . :he $emf$ 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 toyeetvl2w r1gm 6j+8 ya8,yuy,

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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 thak.kp q l(pegj.x:sws7p+1b. pt

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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 thab kovj9(gw:f +* qv;dvn the primary coil then df:wojv9(qk g+v*v b;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 conk lx/1e8ecj+lbi 9z53 lh cc9otains more loops than the secondary coil te l/+ljx8zh9eck35 ocbi 91lc hen 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 power iwycjvd.a4h:9luwj n*nc (h,6nput

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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 resonantc*k +djmw lzut1;0nqn o:s0k2 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 ideal battery of cg0 que32atm7 constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistor isc72ugqa e03 mt

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an 1p)c+ *n:jieyd q/ u- - rw;rhrtqb+j phvn--cideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage ayr)*t /v1ji-nhpcqer; nwbuh q jc-dp+--+ :rcross 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)wfv2pw(z gr mxy86 a( 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 c5-igkjo;t8p(ta pcy*44ir ar)5 asfhonnected 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 ww3s+0w6p ;jql1njvia 9uzf 8are connected in series to a battery. The time constant for the circuit represents the time raz1i;wjwlqnuf3 sjv0+ 689wp equired 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 to a battery. The batter2iu w949 ahibxy is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease i29i4 ubxwha9 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 unitsr(9 oee fq(n*y 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 thie9 (gx0il czn.s 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 circuit, the cqm.o)m1m9 7guxktjqx, b* fp5h5 :ts nurrentkgj*n t:p)mfq.5 m1hxxm 7,t s9 oqb5u

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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 whp:lx 8:jraz w5at factor when the frequency is tri:r wxl z:a8pj5pled?

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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 doubi; g; blrw 3bpx4d0v.iled, the inductive reactanc ;xrg liv.b;wpb3d40 ie 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 i/ sp f b wrei0a*b.24nqf)fkr8nductor approaches zero, the inductive rekeqb0b8*4ia)rws/ p2r ff.nfactance 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 supplz/it/)8 ycje* kr 3kwwy. In this circuit, the curre ciwk8 /r3 je*/wtzy)knt

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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,q y78.mhfwcwx-wg v-r5x)pk when the frequency is h,crpw-7w.g xvy-5f m)x 8kq wtripled?

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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 cjh9ria,w(mif:dq.s zr770mkapacitor approaches zero, the capacitive reactance i(sim9khm a,j r dfz.70r7wq: 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 betweex06; 0sged-exqvav. zn the voltages of the inductor and capacitor in a RLC s0q;-ves0dez6xv.x g a eries circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined asa) lkz/tb-tf9cs6y 8gju.p u: $\cos M = R/Z$, 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 increasf5*b-f ev-fr -qr.zvcx9jf: g es if R increases. Whebc5f9xf rzf-f-rg*.qjv: - ven 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 circuybd 2vbb17tiz:bez r):a a;c; it increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the cie/3*juzc/lg. *dgtb r hjbc*7rcuit 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 ,+ gut-d))z*ec nitwjboth double in an LRC series circuit, the resonant frequency of that cd ug)twtij,z-e*+n) 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 vol2bki rfto )(-*j+ijfctage. 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 RLCzo):1+ m ) pvdx5p ci8*hrm.dqjo* emv 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 uniform ma2;1zwfo r vrt*gnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the mag *wrz1;r 2vfotnetic 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 wpj;w/mae.;w2u)rs s a uniform magnetic field of 0.20 T. Find;aw 2ujs )wrw.ms/pe ; the magnetic 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 rotating/ 46rtluf8clx in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magneticu6l4 ct x/8rlf 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 adjum 0f wxsc)0up-stable 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 coil changes ilog e(a6ta f(xer e-e5 /s,k9from $4.0 \times 10^{-5} \; Wb$ 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 acy*h6 / ,3om;mjr5lamuitjo8 square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, f ohamim jj8l6 /5 mtou,3r*c;yind 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 hr )q)d:o 2 qwfw.ywo) mzpg*(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 a; 6 gpncfuoyvgu29yso:1x1 ,f nd 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 horizontasxp oq 7.*0*uflnd7f cljk .:tlly at a location where the downward component of the Earth's magne7*tlo qff. pk*.sducnxl0:j 7tic 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 lo1 c1nlvgp 3cqh(9 ,6u(dx6aydtwy4x bng rotates at a constant angular velocity of 2.0 rad/s about a vertical axis thro614cpqc x ybu(dn6d1 ghlawtxvy(3,9ugh 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 generat:*p/ nsio/rjcor has 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 oq/tzvj: q+ x(o z-kzpypd:n/* f 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 is 12 cm qmc 54z3: hhytp-o;o 5/ uxhmxlong and 8 cm wide. The armature rotates at 1200 rp h5; 5qy t-h3xxuc:mp 4hm/zoom 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 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 10ljvb-) c5 5jgs he8 mpi:6ode:0 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 constiu9dl(,qa 7 ajqsd 6thbt3(h5 ruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T5l d7aqdsqh3((,jai t 96ut bh 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 ad y(rq - zjfz,8nt*d4n maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The m ny:0x9yw rd5.bkhs 5lotor 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 DCr ab xhxtrryer-7vk)8j3+s- 4 motor have a resistance of 6.00 W. The motor operates on 120 -sh ke)r874 tr3b+-yrr axjxvV AC, and 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 resistance 6.0 W is connected to a 24-V p4;1 ylx3aje heower supply. The operating current is 1.0 A. What is the start-up current?1ha4j ;3y eexl

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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 i0v2n wokh14-ne 0yedhs connected to a 24-V power supply. The operating current is 1.0 A at fn1vy-k2 wo4 hh0dn0eeull 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 resistanc 7qpqqki w4tmqy5w6,4e 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is t54q qy,ktpq47mi wq 6whe back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltage ep ig .tiv0s u9z(r6+sof $120 \; V$ 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 primaryh - s3s cyrdl9l;myg.;x .(idar81 yt+sz+fo j of a transformer causes 14 A to flow in the secondary. How many turns are i.s1a s i8xo+yd 9-(+rc;lyydhmz j. 3 lr;tgfsn 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 p rway 07p0+m ;*tjtrh vt32qw0:poswzrimary if the 24-V secondary has pw0a3ro:*0 ;thrs y j0w7+tqv2tm zpw100 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-tfryr*g7b:fl u 2ll bnv 0t1z*-urn secondary coil. If the current in the secondary is 3.0 A, what is the current0-gl rl bzu7t*f2br *fy:1vln 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. Assuming 100% effichk.hrc5fmda)x(2w; ng0uu+c iency, how many amps at 24 V can(nk;dwx.c2huc) 5 g+ afhm 0ur 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 ofh4aji8+ 93qdf 9iyhah a neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary draw?+ q98hi4a3fhhj9ya id

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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 coirs(pqilm4*. (*hcgj ul and 300 turns on its secon mu(qhl. i* cgs4p*jr(dary coil. If 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 300 turns onroqnc a*4 .w2y its secondary coil. If 120 V at 2.0 A is applied to the primary, what c2o.* 4anwcyrqurrent 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 secondary has 200 turns. Ifif;k z1ephq4 , the input current at the primary ih zp4,;e ifk1qs 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 transfo0np3 c 7pxo5eirmer has 100 turns and its secondary has 200 turns. If the input voltage to the primary ispx35i p 0eco7n 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 and its secondary has 200 dneo,x(duurnpi5 3 zn-+d 01aturns. If the power in3o+pn d i(x5ae1- duzn,rd0nu put 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 steppets0 sw,tj6r e8d up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turt8s6t erjsw0 ,ns 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 )ay9(ko q/im6j;s/zg lrk ph)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 transmiss a oimy6)(h sq/l;jk/kp g9)zrion 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. T1u: g+jvig07 wjyf3c yhe voltage is usually stepped up to 4500 V by a transformer and transmitted through a vju:yw 3g+gfyj7 i 10cpower line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has ze8blu,j s5,xa total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage,xse l8jbz u,5 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 gexb jo*ehzf- 2k5/lg xki;l,n 6re+ vz+nerator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is steppez x 5;xzrl6f - *n2khvl,kjb/gio+ e+ed 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 6y;v99c kru7b9py9ql0 z*qpr w-W line at 1000 V. How much less power would be lost if the power we 0y9c7 kw9 pyz9rlrp;uv9q*bqre transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a line(eq6ca9ev pv hip),t6s ,mi1y 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 the original 6( p h )1a9visqepmyce6vt,, ipower?

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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 5csd (j isayx.6g7(1v w.0 A. How much energy is stored in the coil's magnetic f1 ws(jxyv6 .7sicg(adield?

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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-adok 4x5wk,cn8 hfb+6W resistor and an 18-H inductor. What is this+wkhn4 k6xd 58cabfo, circuit'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 circu*ni u y2x5 (;w/lpdaalit 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-zwei+5kb4+hn/h s dhwx1xo)/p7fr + mV 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 is the resistancibfp3n4 zo :i;e of the lamp f4p:ib oz3i;n?

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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 powerob fqq e6,1;wr supply. What is the peak current through ro ;bfe6 q1w,qthe resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac .l)5qbn8)i su3zghjei x sy p/1( fq)spower supply. What is the power dissipated in the resistox3yi zs ql(. ihuessnq5gj1)/pb))8f r?

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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 resistorae o8qp-dtih fori.1y 8-4;)eslkkv1 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 50uv 9j1-qr,xss a3u 6va-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through b3:e0qia4qehyww ur/9t:-k ta 50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of u)8zq n/cwji)a 1.0-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 reactance of a 2.50-mH coil at 1000 Hzg na k-7xiep90tbj4p* sp16cc?

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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 5fy6+ lvzbyr3.0-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 necessary for 157 W of indu2c e-cqich 145/ol dtfctive 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 u-epbj0 :je 9ej+ vcx+a frequency of 20 kHz is apej e0pe9jv+b+ x-uc:jplied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 1v7irnn 3.wm2o 10-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 kHyp6ivdx2 j2 k ;vfu 21z9aoe5bz?

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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 nht fvi(o /2kd6dc q--reeded to 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-mF capacitor have jl;k j hj+1uz;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 capacit 68fi 2lg x.fly.9af f.pimk 81ehc5ofor be 100 W?phfa9loy 8l..i e xf682 5mcff1ifgk.

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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 taik06 bwq do;/ *b)isyhrough 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 of an ac series circuit with 12.0 W resistance, f/ksc:uxh0 h1 15.0 W inductive reactance, and 10.:/f xhhkc s10u0 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 impedance7qd6 ,haq53*beruss a/ w)efy at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are consysawr53*euef,hq / b6)d7qa 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 anglx )nybzzoj -a yu00u5)e at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are coaobyu yju)z50zx)n 0 -nnected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor -zc -uiy;etp(2py cq3fa2lriweh.g ,x* pr7;, what is the impedae2zity p(-c p7 *x p hg-i,w3r; q2yucrelfa;.nce 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 resistorg42 2ldkjm6:mxh; alb)d b)x.s;c ngn is connected in series with a 20-mH inductor, what is the phase angle at ns2 4) m62mlb)xadbch;n jg;.:dlgk x1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 12 7 -::fz+hcjdl;gagh4n+uesz (az a a.0-mF capacitor for a total impedance of 100 W at7gagzs:4da;nl+(u-f 2+ chh:eaz jaz 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 ojghn3r,0rz c-gtr71 needed in series with a 100-W resistor and - 0c,gz1trhrjn73 ogr15-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 series with a 450-mH inductor azw)t;26nryx s cwy;x 4t 5000 Hz for a totawt 4xry )z cw;x;y62nsl 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 p02e yxmfy*8zjy* 2-nkh(a0 r7oh otq vut in series with a 100-kW resistor at 1.0-MHz for a total impedance of 150 kzoqf 0veay -y0 r*8jmtxo2(2n h*7 hkyW?

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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 capaco)x0 1, .p6rbh ,xug5dub t3 2mzmsstuitor. What is the impedance5)x sz rdmuhxuo6ug.tp3s btm2 1,0b, 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 1.0 kHz for n8nv +t3nqf( z wsn:3ca total impen 3vns+ n8:ftn3(w czqdance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10 dy mm)8xrh0ui(2ou dg4pmc ;.-mF capacitor at 1.0 kHz for a phase 8 mxid )mo;uyc(m0pug r.hd42angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for a tod7 uw3.rc/fx,qj2w/6cg jz cctal impedance of6/,cj xz37grud2qc jcf/wwc. 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-mF5tt 6z. bm (wjhb7bxy5 capacitor at 120 Hz. What is the phase7t .(bxjz b65hb5 ymtw 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 kg s1ro)1 etmpp pfv7 0,oa*6q1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-,vpo pq remtafg pso*)17106k mF capacitor 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 10h3aohgbmj:tjfq 14p-x7i0 vfjp ;3 9h .0-mF capacitor, and a 0.350-H inductor. The circuit is cbfa3o pq-;1jxht90h j 73hmjgpv if4:onnected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 Wiva:p2v bg jd3k5s.th7p sik8m9, zc/, a capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-s3h7pak2 bm 95pz .:vd,tivji c8sgk/ 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 4+t/xx*bqdmlbg y;k -1pycz3resistor, a 10-mF ca1 /g;xybzbpykl t+dm-34*c xq pacitor, 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 resistfk-pc.mse bi/ d5qvppu9;g,+ or for a phase angle o.+f;pgmsk5vu- 9cdei q bp/,pf $40^{\circ}$ 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 wysi,6zylnw/3o hukk5 z6a- ja.8xnf,hat frequency should the circuit be driven in order to have maximum power transfeo63nkfjlz,u,5zkiah yw/s 8ny -x .a6rred from the 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 12.0 W resistance, 15.0e ued89kk( l2w W inductive reactance, andk2w8lu e9k(e d 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of a5 omw qn7*o8nyn AC 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 of0jqn6f 8z .:i qljofu* 30 W. What is the qoq n:fl fu8j6j. *0zipower factor?

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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 contaiu :9vcar3lpbq7u wz 9.x9y; wyning a 50-W resistor, a 10-myvy 9wq .9uw3luxb:rza9c7; pF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and agn/ 8t)jv a 2qa0nm06mslmzjh08u c*h 15-mH coil in series? za6qhntchm80a0jmu2 *gv s8ln0mj/)

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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 w0m fmn, c +9gt 1d5oon6xqn7xmith a 4.7-mF capacitor for a resonant frequency of 10 mqoxo 7xt1 c+m 6,dn5fnngm90kHz?

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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 ind1,s:6ba m j qx3ril4ycuctor for a resonant frequency ofa61 3qx rmlcy,s :bi4j 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 resistor and a 40-mH cp, f d)wqumf9wf 6w nsy()omu+f(,;cjoil if the resonant frequency of the circuit is)+) p w(f6wunm9fjsw;fyodf,cqm (u, to be 1000 Hz?

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