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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 magnetic a ;v6*0p7 si p;yxbp-sl2 klanflux 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 induction states tbhv9h5pjs8 p k)0*iqb hat 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 , wihajs iv*hjv038l* of loops of wire in a coil produces what kind of change on th,ih* jw083 vvjslih*ae 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 fii0zfk 5a. pk6(cv4kj ge/zv3y eld through a loop of wire produces what kind of changf563z0.4v pk( vjaky/kgezic e 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 oay* nrf;5e amux0 cl4; z4;zsaf a loop of wire produces what kind of change on the induceay5ac ; rs;f l*4nzzm;xuea04 d $emf$, 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 an/b9sv8 4hy w/ +t.tiet3fat6ql jeo(f $emf$ 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, th lq a)30m.7yxx6 pwpwxe direction of an induced current in a conductor will be that which tends to produce which of the fo x3p0 y6 x7w.)lmapxqwllowing 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 magnet ixgs7zghu;) -zx rp,o7q0 , h9r4tfsoos held above its center with its north poleq774 opxr og hr;u ht9o0)z, ,xzss-gf pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar mamd .5 .sqei674dwjv4:gjww bqgnet is held above its center with 6.d jwbd.44mwq5vijw e:q7gsits north pole pointing down, 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 table top in a region where the magnet :ww6j8*m shx.8bf dt)mh0yriic field vector points straight up. The magnetic field y6wfj 8m mb: hixdr8w ).s0h*tvanishes 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 magnetikc qf9:i c4;,i+ cm+-ou2 gess/ mltgtc field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the directioni4+ ul :kq-2, fg;eo tmctcsgmi9cs/+ 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 in a region where the magnetic fiel(ts qi-ii2u5 6wuu7 qyd points straight down. The magnetic field disappears suddenly. When viewed from a (wu-qu6 7 5s2tiiuiqybove, 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 carg,r 8kj4zm2kwj,-y5w wvqj 8x m4/nse 1bdju 8ries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced curren 1d8j4 j8bgvu-mn48z qwkx2,k w es,5jjm/wr yt 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 thees6l(- brlu m njq4/e/ north pole entering first. As thje lm/ 6qsn eb4-r/lu(e north pole enters 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 wire is rotated at constant angular speed about an axis w m, 7mnqj*mvy zs7id7)hose direction can be varied. In a regi vsm7mjq7 ,d)yi z7*nmon 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 constan. ft)rsbs2 3art 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 rotation if the indu3arf)2bs t. rsced $emf$ 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.v ,ii,q *3dd+6-8b wjz: gxka1 orujoa
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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 ju xo2t.zfs+ (qdpu/:oiuj0 ;that an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. The 8f 7a1oxkvkj( $emf$ 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 cf r/smdjq*s4g+0:p gx onstant velocity through a magnetig/gj: r 0+msfqp4d *sxc 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 rotates at a constant angular velocity yd-0 w:di1w ky*id pg/$\omega$ 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 transfo0:j*r +gw nnpprms

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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 ety/ lat *ty*12xwh9biach second. The frequency of t/ytti x 29hw*ty1al b*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 usesvkr,*pef- )/u p dat)d to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device cediww: 8,dn)(q,wao 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 primww c-vrt( y0*se1-dve ary coil then i e0y- r-*wvdtsec1wv(t 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 secondary0dgalc 5; wnal2d 5oi2 coil5llwo20a2idg acd5;n 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 power in 3g)tx)o(q+md q l.nns35 znxeput

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant 0 rn h3q; lq3- s:vinemg1v6ur-0jsrrcircuit,

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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 c )(+(n lm6lm23jg sgmac1ftadonnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltsmdn1l)3ma(a+g( c6 jf2g tml age across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery hmzf7q xl/a6+of constant terminal voltage. At the moment contact is made with the battery, 7 qlxza/+hmf6the 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 -ea)ufb zp.v 9;a8whl 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 uuz nf0xgs(amu;f-/6: tsqz , zqvc9+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 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 seriesye -,jpwpk9nlvsu,2rk;-h k ) to a battery. The time constant phsy-kl,k e,v) 2;p9 jrukwn -for the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a batter+jcl 5zbs5ix) y. The battery is suddenly removed from the circuit. The time constant for of the ci)5izxl+sc5 j brcuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have thewxpk n-:;ki*o same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the curret)cd ts3 ((kymnt

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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 48whzz )vrejx *an7 e3to an AC power supply. In this circuit, the current4vz xhwea37 jn*zr 8)e

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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 vznt 6/f teou5.gfi 6)changes by what factor when the frequency is i/6fvto5.zne)fu6g ttripled?

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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 bejyv,*6zdtz edntz65) 7v/jan inductor is doubled, the inductive ddze y/,j )vb*t75nz6zt 6vjereactance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approach680xo0fcdr ioes zero, the inductive rea6dox0cri f80o ctance 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 sup(ic8 e/nfh(qi9io 0o di9jr+tply. In this circuit, the curreo+j i qi/(i fc0id9(e9hnt 8ornt

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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 chan3y) n6kjei tr+8l,zq*djy(7c/xyb 1*biwgd p ges by what factor when the frequency is trlzgbc y7+b *rit813yd)xq wn jdk,*j ep6(i/y ipled?

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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 acroq7 sgzj1r.)1rgww ;s2s1a7grx3g kpw ss a capacitor approaches zero, the capacitive reactance of that capacwss71x qag)rw 7 j ;1wprgs1r.gk23 gzitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor . e,exeirn96h *ih bs l*7lzz4in a RLC seriesrezbzhex*e4. liil976h *,s n 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 g5xo/.rc/grb 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 circui8 2x tz2yivxpxlmb s:tk46 9c-t. The impedance of the circuit increases if R increases. When is 2xtpt xvic6byz 8 lxm924k:-sthis 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 circuit1, cs.kmsd, jj. The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of thxg*-d-a suy/wvl,9 k 9 a0i2ptdtaj3ue 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 8n e5*x3ox jqbz scpk)c-i26h capacitance both double in an LRC series circuit, the resonant frequency c kpjo-*eq 5c23x68)b nizhs xof 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 tlweyr5 )urdp o7-*vd 7 d-2hcmwpi9g0hat is driven by an AC applied 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 RLC circuit oc jz6csug7uz:z*99 mg83 agbxgcurs 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 uwne dmfc(m/j;y000, pql nj-yniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fiel/0cl; q-yf0(,ypjne0wjdmn m d 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 magnetic e:qtw.m5u56lhs qt j quy 6*w6;ex6e lfield of 0.20 T. Find the magnetic fluxw6qh:que6 s lle yxw*;et5jtu6 5.mq6 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 rotatingm)0* gh 8iyf. 4fg ocun-v6w oxf.. y0nha+jpw in a uniform magnetic field of 0.20 T. Find the magnetic flux throufyjhwwg n*-v.ug+a 6hyc)fi o8..m00p xno 4f gh 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 loop is reduced:y); xxirokjlp9+z0h 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 ce1wxd)7l hm-ahanges 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 withmz wzzb1jb9k ;k yk0h l4(lc+7 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, find the av4z 7zl9 hk0(bky 1cjwlmzk+;berage 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 area ov6dw .bo5i; mxf $0.40 \; m^{2}$ 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 m ic4zhk)up5*d 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 horkri(92 g1e nisizontally at a location where the downward component of the Earth's magnetic fiek 1e(2sir9g inld 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 tkj qy3+i xb1, rkt5hr saor:85hat 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 while in a consjk13t8x5h kq+: ir os5ra,r ybtant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectiyy;jyf y8+;ok8+l pwty f6/ hponal 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 t-x9zl b7 *zlj iu b3b9(/ea3; 6la.hkquh gyhrurns 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 1putyigq-8 qyk/-:y,2x sfs qm v22o0n2 cm lo0un:q y v8ys piq2y sg/,-fk-q2mo2 txng 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 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 consistlygqk7qa9yjp62czun++ +h : ds of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced 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 Aq-ie u7,uanvat8q,2z C generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is q8uqvent 7-,u a2aiz,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 utwv2 *0vp/hwmaximum $emf$ 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. o5k uvk6 ;avcc ih(z6s) c/zw fqt*+h+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 moto jc99e)lhy*jki(q f8u -guy +nr operates on 120 V AC, and when running at fullk*(99i)n8 qu-j yl fyge uhc+j 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 t( p +/iv6ltcsco a 24-V power supply. The operating current isp6 /cclivst (+ 1.0 A. What 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 connected to a 24-V power suppr tba .m-/ (qcov6 n6j7zo4syqly. The(6rvs.7o 6 nam/ c-tqob4zjy q operating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of interngfi-u .jn b83bal resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed-n big .fu83bj. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltax)fab0jgl ,t -ge 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 c5ch qu+ca:;fuhx 8hmpe*p 0x2auses 14 A to flow in the secondary. ;pefpq hu x08hum 5c2:*a+hxc How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many de(nel0)ogr.g6rui 6kh6r f/ m)f1nfturns are necessary in a 110-V primary if the 24-V secondary has 100 tuflg6g0kfn r 6rhe)i/1fm e n( .urd6o)rns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists ofpox* ynp -x66v a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, whavx x*opnp y66-t 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. Assuming 100%sovew5 g0to 7, efficiency, how many amps at 24 V can flow in 0te7w,s gvoo 5the 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 mAfpum 2b ujzfw):- h3p,p8fj /z. The prb:mjf) z/up2pzhw3 -p u8 ffj,imary coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on xyly2( r )ps)3*tb5:fcjoa oeits primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A i)2j x3r fty lbs(y5*aooce p:)s 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 ja(5rjh /ezu**upk/(kxmq r3 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current q3 mxj*// 5rh(ekzkjpauu(*ris 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 tranqd))0u+c d mvy+ygq be bvb,0:sformer has 100 turns and its secondary has 200 turns. If the input current at the primary ibybv+ecuvy +00 d bg):qdqm),s 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 its secofm7k,2qf2b-r.7 vhkq rbhv **lka pa- ndary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage ofvpmqka*hrq-fl kkv f ,2hb 2ba-7.7 *r 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 seconday, 3.wq+2*eb vk sy81vvdhqhr6qua/yry has 200 turns. If the power input to the primary is 102hkb/ s 3+q d1,vwar yvhqy v8.*6qyue0 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 usualei+xtyr9 a x ;7zf-0pzfudq14ly stepped up 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 primzyx ta74r1d ux09 f;+zi-eq fpary 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 viams+vhz5xje 8)4fi6rft .; us *eb)joltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transm)sre+4.zjbvj;i8a5ux h*stmff i e6 )ission 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; crjs4 p4ugv( of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in th jurs 4(;gv4cpe 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 c*-gqy-pw()lqes-/yt3d zvu km long has a 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 wu qy-/zclpe sdyq-w-v gt3 ()*ith 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 4lc x(tu6 )juaresistance 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 ruljcxt6a() 4 uatio 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 ldv4ey j3sd ulgcee1k.28 +.o yine at 1000 V. How much less power would be lost if the po evy.k cd2egd1jl 8 uy.e3o4s+wer were 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. s6il com- xfiupdvj , 3 d10bba/1d-c) 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 ,c0pxlo1ac v/) d-mf3ds b6bi ijud-1the 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 much energy is stored in the c* n 9p.noeu5rmoil's m59o m.nu*er npagnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H ik-c (dqri.w,8qkg e6inductor. What is this circuit's time wqie. ik(k8 -6d,r cqgconstant?

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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 thed.bi5jgbwhh,3 f n)a; rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC 2jrgux9)uks,7f v) 1rrw*lju 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 rexm7 1j0maei. isistance of the la7ixae1m im j0.mp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is thhd i3d;nz ofms6c(-j*e peak current through the resisn;cm3hs i(j*d zdo -6ftor?

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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 connect-z)ajbj: 3webp kli,6 ed to a 120-V ac power supply. What is the power dissipatab6w-zb) j j,3pel k:ied in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is ee; ).oh(eemy $I = 0.80 \sin (240 t)$. 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 resistor ir d0jbxr9 v(:8dxt1r p3yom:ws $I = 0.80 \sin (240 t)$. 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 mfxty okv 4909a(s.wwa 50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 60 Hzj0; k wjx: 7:dwm-zi vu52lfwa?

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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 react: sggz)f6 j -cbs6.0rw:6 rsfyngci/xance 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 induct.b-p,2mearol e-16 k yie ln*nive 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 necfg2tpkf6es:ga cj)0 5 essary 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 qkb6kena4-*c a 60-mH inductor when 120 V AC at a frequency of 20 kHz is apkqba-c6en *4k plied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 1vqcx:s w5n(fn0ttb)hy9- ; jd10-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 capacit)*bqgf7faa1gr m 3z, bor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at 10 kHe6pu s ;pf4d2fz?

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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 cap )d g4arron/d5acitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be 1 +f mcn)cgj214t9yrza00 W?a1tf yncj49) +2rczmg

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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 Hzci+ ecq) ;o hq792bv9 l7ehpdp 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 seriesbn5el6 vwp7:q circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactanqvlpw:5be76 n ce?

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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 z;v gaagrf (14at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in g;gfa4z (rav 1series?

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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 7hwy 4p--1djrceh-nbef4 qx. coil, and 1.0-mF capaci wrb-j . q4y-peedx1hc7f-4 hntor 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 in series with a 20-mbfd 2e46u.fxus0 2mr oH inductor, what is the impedance at 100.2rm6ef4x 0usf dbuo2 0 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 iqmvu2*+juzwm +c 3zrbal* /m2s connected in series with a 20-mH inductor, what is the phase angle at 102rlu+3 *cw*zajmum 2/v mq+ bz00 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 andf7av* o po8(zf 1.0-mF capacitof*av7z fpo 8(or for a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following cap sx2ixa*a8u5- rvha,a acitances is needed in series with a 100-W resistor and 1- x vsha aar5xia,82u*5-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-m53tkpc3 *jarbiy 7 p8gH inductor at 5000 Hz for a total impegc3rjp *aytbp 7k38i 5dance 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 ix:zi .0bwkal ,n series with a 100-kW resistor at 1.0-MHz for a total impedance of 150 kW?lz axwk:b ,i0.

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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 wit pdv-s** ,hyl)wwgs g/ qzy wsn,sl,8*h a 20-mF capacitor. What is the impedance at yls ,gs,-s*p)zsd*wnwwg ly,/*hqv81000 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 105+8ai 06b5/mw wt uj,sr etiqu-mF capacitor at 1.0 kHz for a total b qi5u+w/is, er60tmtwu5aj 8impedance 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 neeq zsn- wctmg3 8xsezpn(b310.6-vn j hded in series with a 10-mF capacitor at 1.0 kHz for a phasezp3se8xmn 6b n0s-g(.qhc z31wn t jv- 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 wia7olwa yl5o.39aw ; rrth a 30-W resistor at 1.0 kHz for a total imay3ro;r llao5 .97w awpedance 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 g8h 1re sckwk,50i.yxj7m u3ox4p- j qseries with a 100-mF capacitor at 120 Hz. What is the phase angl ym-h jx.4gjqwos kp3ui c1r0kx85,e7e?

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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 resisto;+silwuyk cl+y2hm 5dk pc9f+1)e ln1r, 20-mH coil, and 1.0-mF capaci+y)2kpy;sdl++ eml wic k15fl1nh9 cutor 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 10.0-mF capacito :h3,t7 u0o kxavh,t1;crbj dnr, and a 0.350-H inductor. The circuit is connected to a 120-V, 60atrkx,u h:17,od0 t; bcnv3h j-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, l-: 2a6ziht;re wktu7and an inductor of inductive reactzt we26uk ;r :hat-7ilance 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 circu)( cdn faxh(;anbf jcj4821gt0vr,e fit containing a 50-W resistor, a 10-mF capacitor, and t8cc) ,0efbrg21 vhajfa (4;n nfjd(xa 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 rk:s(2r h9*i ec5mgoa pesistor for a phase angle of s(g p* ih:2ekro9cma5$40^{\circ}$ 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. gsi;brz;o-2: lqb9 s rAt what frequency should the circuit be driven inrbo;s zlqsi2b:9-r g; order to have maximum power transferred 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 cirzuf s8ktb47wpn 37 vk9cuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when t7 vkf7btznk 3w84u9pshe 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 cisx;j3+ jgqfq1els3,:jch0oa.j nn f*rcuit 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 resi ;j )nl7hs;lqestance of 30 W. What is the p ln)he;jq;l7sower 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 containing a 50-W resisrnmir)u6lw 4a1j*2b*kh0k* bz*y ll jtor, a 10-mF capacitor, and a 0.45-H in lhla1*6 k bkwj*lm 4jrnrizb02u)**y ductor, 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 c5dkdse zjh 1pa33,a 8uqhv-+joil in series?,ekdaz s3h 5uj8 h+v3 a1p-jqd

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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 capacitor for a resona2oa ci0ak: kj.nt frequency c. aj:2ikk0aoof 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 inductor1 mam 5zax/)q:0oim m wt;)sop for a resonant frequen)ao)mxqm5swimmt z1o0:a/ ; pcy 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 se y7w7h x dlgolw-8gc;,ries with a 30-W resistor and a 40-mH coil if the resonant dgwl,loyw x 7c87;hg -frequency of the circuit is to be 1000 Hz?

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