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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://autodiscover.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://autodiscover.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 ar erv.(vw*qs /9i,qyxue 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 induction sta *s2r4*yc ezsdab a7/gtes 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 onq6( ue;py1t of change on the ; q1o(uetnp y6induced $emf$, 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 wdkqe*f1c4i*r-cgp2e c 5,bw produces what kind of changeb2k,fdwgc5cee 4c i1r* q*p- w on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of .t kcp*8j5megnhe+( qchange on the induc85jtk .c en+mg*hpe(qed $emf$, 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 fieky /hzk1m/a/lugb7* dld an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conductor willij8 zp0gpgu /7b(-qis be that which tendzpg/ ui big8 7(-q0pjss 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 tard3hkyodl2hoc8rb, 3 8jc(* *m 9ohhzble. A bar magnet is held above its center with its north pole pointing do m89h *dl3o2 (y,z*3c ohojkrh rch8bdwn. 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 magnet zt2jw h +;tzv:is held above its center with its north pole pointing down, and released. As it approaches the+t;wjzth :v z2 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 magnetic field vect(p4t-bmw l35p 2us wifor points straight up. The magnetic field vanishes suddenly. When viewed frob5psw-tif4 lm3 2w(upm 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 tas*2;sj+*xgwg +bcnbm ble top in a region where the magnetic field vector pm s +nb+*j2cgxwg ;s*boints straight 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 horizontal table top (n*2r3 di.jmqe y1g3d jtq0oain a region where the magnetic field points straight down. The magnetic field disappears suddenly3qtq r jjd2i.e dm(a*0g13ny o. 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 hc b6m(cv vj-* zwom6.forizontal table and carries an ever-increasing current northward*6v(vmz- 6cc owjm.f b. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the no) rplw ay.26+qlhex;arth pole entering first. As the north pole enters the wire,qpr)+hl .a6l;wyx 2ae 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 whosepwtx9 7p6ot e5 direction can be varied. In a regiotxt5 6 p79opewn 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 angular speed about an axis whbpxik/si+d92a3 s t p)ose direction can be varied. In a region where a uniform magnetic field points stri3 ps9 i/pb)dska+t2 xaight 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.siy,a.bl6 20qoedk m gwej:fme 59. q9
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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 tha6c7diqn(n3so-u d u( k,.nbxs,o oi (dt 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 f it mvpe q65gkvra1 bvq:i gc5925kj*;ield. 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 dc jp-:ssub3;plri/jyni)gu37o u 5 d2irection) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rodup i57usns :b3ij)p 3u/rlogcy- j;d2.

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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 v+s1cl ylv4i tg9;pm ( +bloz3relocity $\omega$ 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 transfok k.-nw(tb2 yurms

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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 0;pu ujmke-361 crxkythrough 60 revolutions each second. The frequency of tk; m3ucrx0ypeju k-61 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 use: bj3 : ,spxndgzs1lo2d 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 tokg.5mmk ew - yz5yrib).r6w2 hat

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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 contailr -5ajy5wv afn4d9h)8sv.3st htn 7*wyll:x ns more loops than the primary coil thenyns84l) tjfvxd9h ant3l-ry.wv*hls5aw 5:7 it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains+nnfw+ 3b(udu more loops than the secondary coil the u(udnb3w+f +nn 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, thpb(5qo fw1;chqcfp+nks7u2 /e power input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circuit5:nazy;s e3 l 2sb;nueyx(4ab,

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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 .jv ifbe6/jb y2wq ;4min series to an ideal battery of constant terminal voltage. At the moment contact is made with the battebw4ifj/vq6 e b.ym2j;ry, 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 3taejz5( mfe-h6/tvh are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltagh-e/vezjtat3( 56m fhe 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 connect)oz9 0c4-lec psypmj7ed 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 connected to a scvkw;*c9;onn $emf$. 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 batt na0tnsu4tza1hj, 1d;ery. The time constant for the circuit represent4 aattd,zn10h j;uns1s 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 batn0r ,qobhk5 pwh-ctb+) zw4+stery. The battery is suddenly removed fro+rts bk 0zh5)w+cohp,q-n4bwm the circuit. The time constant 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 following have the same ongz cjbu sn jp,91 02-rg4ey6units 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 cycn3c; cl;y5n, 2yicw urrent

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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, thedlh gar.zyz(ro4:g7eh,+ wn * curren4 ,gwrohelyzhd7*g : +rn. a(zt

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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 what factor w i+cya *liv0lcjcj(vaqx;29cr 62 v1mhen the frequency i;v(+l*cj q26liycmcjia1v v 29c ar 0xs tripled?

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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 induct6y5ekrs. 6l+zjd :k uzor is doubled, the inductive reactance o 5e6 .l:szk+6duy rkzjf 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 a3a+xr0d;jekt n inductor approaches zero, the induc exadr3k0t+; jtive reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this vwgc )w(oda *yc v3z(9circuit, the currentov wvc(gw3cdz) 9( a*y

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in70b-7sctqpbn1 t/ ixa an ac circuit changes by what factor when the frequency is tripledni70-/cs 7xqtta pb1b ?

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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 voltage8a9r*(tzeocs l6 ,:q. :xhp -cjjz pc,b8mvgz across a capacitor approaches zero, the capacitivex6g-jomrt: cs c e9: *8z,qz j(azc.8pblpvh, reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltag t26h 41b/e wq/x7x fgc4ccpzqes of the inductor and capacitor in a RLC series circui q44x ebt/ghp 627cc1 q/cfxwzt?

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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;nhb a(9 mabt: 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 +ys4 :cga*,1ywiossm increases if R increases. When is mscs4*+ayyo:g,w1i 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 circuit. The impedance of2jewwa(j9czt, r l:)l 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 the circuit irvja5g2v xy. hnwpbw wf3+w8r ) (2w*zncreases 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 ts vtxrd)hyrlr+ fbdx*+1j. :)he capacitance both double in an LRC series circuit, the resonant frequency of that circuit w)j:.bhld +x v rd+)1ys *xrftrill

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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 sfuii jyk9fi *-7kc8y;o4 c 0mapplied 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 jc5kdcn u/:)k 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 r gkn3w m2tj3 na8 /(u:sor4+ulvfwo5nadius 0.10 m is rotating in a uniform magnetic field of 0.20 (8fw4stugk o2w3 oj5umal +3 v/:n rnnT. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radiu:s/robbuf4zrx * zl l- /4b0rss 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of theluz/xzrb r40 -4lssbo f*:/b r 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 in a unxs;5 t(c9w ynriform magnetic field of 0.20 T. Find the magnetic flux throughxrwn scy(;9t5 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 reduceegq1c k9xn u,g .48gw7cspiv.d 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 changepaw vk3y-tgb g21 efc1qp 63hjy;8y-ks 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 2*s t9 i+ca*x*dqs /pus00 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applie t*s+ax9pq d/s*ucs*i d perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire wi/p u6qbl.vb :ath 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and area 4v1jzoq:,q :jc2nvwo yq0w5 s $0.20 \; m^{2}$ 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 horiz/ q8rdphnq, th8xo/e 9:debe,ontally at a location where the downward component of th9xo,,e/ heq8te hdb:qpdn 8r /e Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2t(f.d 7mimj:v8ywl i 9.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis 9d vl(tf7j.mwmi:yi8 through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops ani ;b6tqh) 7gwx *ftfb(cci42xd a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire ibsafa;j q2lpdgd:z1 j2 98/mof 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 armatbd.o8e:dijzqp; 3jl a3yobn7) 2f, zyure. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this ;qdn23 y3.pi jo:,)lzajfdyobe 87zbgenerator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 tu1lh*h4b6fsc k -clf/sg; hbs2rns 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 12 2jovt4 *k5awdbs mx0 f 9. xc-vcv;sj.V maxim4 -5s docx2 0w .jjbx*v9mv.fkstvac; um when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a max6uqq au/eyt;,imum $emf$ 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 motor )x(c.b** gbszql *cxaoperates 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 re4*j .b riicwu5b;+)sq0tti0vctd m+ csistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it sc4b;)0ur + +dqtbc0* m itiwjcv5t. igenerates 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 isn x6ypy/:s:c rm,et0x connected to a 24-V power supply. The operati,rnmy cx0ysxp /:6te :ng current is 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 15bs rz modf/gg9egg+q6b8 d0 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speezdg1gsmf9br g /qgd +oe5b 086d. 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 coy. un5j 98t,fa6tw zgl0koz6onnected to a 24-V power supply. The operating current is 1 wz0. o6ou8y 9tn l5fat,gjzk6.0 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 needekxs;iwx .lrxdk3m*g, ,gtz96d to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in ociwhh7ikb* 0h5;nm -the secondary. How many turn mhcwin hh0*obi5k-;7s are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V p oo /d75pkr3fcrimary if the 24-V secondaryf3 op 7k5or/dc 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 an1)vbea n0quj4p. c)d9 )ztdd-e(azo ad a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primary?z a- u)pdbnd1)o9az04)qt .edjaecv(

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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% efficienhlne0tfv *i 0sr)e:vkyc/;r (cy, howirl0) s/: evtr y(*f nvk;he0c many amps at 24 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( z: 1o+r qkn vk s2pk(iyk-)qa0y.cil a neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary+ln(so)c 0k r:iy-pvk2yk1.zq(iaq k 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 coil and 300 turns on its secondjp6;qa)fxq v j+;s 8jdary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the )6fpjsq;xv a+jd8;qjsecondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its; (.z/biurcy n secondary coil. If 120 V at 2.0 A is applied to the primary, what c/z.rb; ciynu( urrent 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. zhb5xu: ixd25If the input current at the primary is 100 A, we can expect the output c h: bxd5z2ui5xurrent 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 hazn9txzaih-fq,rp 8k0ghc;w ze. o6ec :30l (zs 100 turns and its secondary has 200 turns. If the input voltage to the prikn(0he:3leo hz cr8x- ;az6,ptzg.w0f qic9z mary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 thr1d) ne4) 5ppj3pdyn* qmwa3t 3p9l uurns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (nen5dny4up1r 3p93epad lq) )jptw *3mh glecting 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 voltagekfm7n*:v8b fa)pxv i xgj )m9, is usually 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 primary ha*gam,vvfnb9) :fx8ij m)xpk 7s 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 voltago)k6 2r/5t csqnth0 /zxzbbfkjb7 +.h e 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 k t +z )xo/.5nbcsqb6 kfz0 /jh72rhbtlost 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 Ac ywdg7mbp;.e.;8o2zr z x:hy of current at 120 V. The voltage is usually stepped up to 4500 V by a db;gx eywrz78: m2o yc ;zph..transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.u .*l+ub( : oxwr+8 pz yc3ckbt)9bk9tosl ie260 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost 8o2 9tc bbu 93)wly*lks tbirz:p.ko +u(e+xc 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 eeb:v;i-6v3b+ fg. c/y 5eui- erxorxlong 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 r-xv ;3+ib.e:b guxferieyc-o/ 5 ev6up 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 6l dx1x:b 1e -u mh5vr;c8mb,.1u kjejt-W line at 1000 V. How much less power would be lost if the pc5eb d1e8 mk; mb.u1:1,vut-jxrjlh xower 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 207m(mhwby: t 7u A. It is to be transmitted on a line wibm(w7: yu htm7th 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 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 opwv3va2 :o)j gf 5.0 A. How much energy is stored in the coil's magnetic p3 ovg jwa2):vfield?

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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 reeb .fey6sg(.0m.a mnlsistor and an 18-H inductor. What is this cn6y0me(.g..a s l mebfircuit'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 A:fzh3js6 3s 1mppuxu (C circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak u(bgi; bly05tt6g.rha9/civ 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 in)j qc+m7wr:c eto a 120-V AC outlet. What is the resistance of the lampcr)wm+ je 7:cq?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peak currauadm;1,8+eekncy -n7 cx+sdent th1+a e,nandu x8c-+y7d em;cs krough the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected r/4 j7nqvajd+ to a 120-V ac power supply. What is the power dissipated n4j /+ravq7 djin 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 re29b ;lgq fvw.fsistor 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 qccj0j u9;cp , :gqyorm )ug1/50-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 a 50-W r iam3dba1/;o xdmd4vnipm 55/5ny,lm esistor 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 a 5 ido2thxwg9gb2+wi .t 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-mH38wqa30zizb/nt dls e3 m(x*/pfc:n(ru:d vw 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 induct9*fc * vjs fkoyb.2.n2;s nxllive 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 nec4p m4cx9v: ptvessary for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor wheo-e;s. ibh20.nskd mh l )p.hfn 120 V AC at a frequency of 20 kHz is pso 0 hf-m bk.;l.di.h s2)ehnapplied 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 110-V, 60.0 mkr f/(yf5vn* ewzz72 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 kHzi 77pflf h9jes2:ix u5?

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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 50firq-;e f2/zw6ds1 m 0ss6ilb 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 bd4l cot1w )wbfu1,o-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 ca n3 mr/zhi1vy1u:r(s /-/njvee sk5bvpacitor be 100 W b-erknses1vzv: hn(/ 1m/ j3ui5v/ry?

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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 capaci3 6rtss8gq32rk1dqo v 5mi0mvtor 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 sstkn.c kab ;)x2nagwf : hr6i4 fb637leries circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance?n3ab7fgtkf.:r2ai nl sh6); b6xwkc4

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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 imsc.d+t8wt4 cpf0 ica h337i fmpedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series 7f8ic. 3d c +tiw0mhpsta3f4c?

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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 ate)g*3 me.eg1ulqz zx 6 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connez .eug)6lem xqze13 g*cted 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, wha:. ,7rwa uyiztt is the impedance at 107zuw r,yt.ai:00 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in -csh+*d 8z1 phf(9 uuura:roiseries with a 20-mH inductor, what is the phase angle atoa(ru urz-fu h8:his d*19+cp 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF capa o*rq;z1xo gz4citor f;1xzq4 zgo*ro or a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series witu xup(ao.uoxq */g9o4h a 100-W resistor and 15-mH coil to get a total impedance o(a9 .up*oguqoxu4/xof 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 indua(ru)u.l(ehl g ,0doni;i+wrctor at 5000 Hz for a total impedance of 4000hlgd,an e.u;)i(+ (il wrrou 00 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 ined-a;2; 5 jemtfevg1. ocxf3n series with a 100-kW resistor at 1.0-MHz for a total impedance of 150tmdvx1n-.eaej 3; ef ocg2f;5 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 cahyw,98 jeg,ow pacitor. What is the impedancewy eg9 ,joh,w8 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 capac3:. mq6*qupq: urjmcm itor at 1.0 kHz for a total impedam pq:uj.c*q m 3q6mr:unce 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 10ck-qt4sn ,3d p-mF capacitor at 1.0 kHz for a phase anglct,s n4- pqdk3e 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(fp( 4tl-gq6wvteyr k -(:ngx 1.0 kHz for a total impedance of wer:xf6g-v nt-y(g(klt(4p q45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is7 ut(,wzq0re(gf7 mr9tj )f ,oo6 wjxd the phase angle9 ue rgf( 0mf,q6w,jtw(zdj 7ro)ox7t?

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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 awu v8xpjk-12d )vro0x1fewj ; 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected i0jx81kvr1uojew;v fdw -p2 )xn 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 ;h1llaal 1v+s, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, lav +;1as1lhl 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 capacitive0e s xuz;(*(oezxow trn -4x+d reactance 30 W, and an inductor of inductive reactanctre +z*sxnw;- (xo x0uez(d4 oe 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 u4 x+*mlb lmw7a 50-W resistor, a 10-mF capacitm+bm ull74 *xwor, 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 res+dkn dhv bcn8xo-ql:v*62p(eistor for a phase angle oh:2oq 8e-nd +*pncbvvk(l dx6f $40^{\circ}$ 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 whatekv6nuse 8g-:+vd q (ua.n1cy frequency should the circuit be driven in order to have maximum power transfer+ de 6a yk1uv.gse8c( q:v-nunred 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 k gat 87o9b kq/k3ipsw8:qm6c series circuit with 12.0 W resistance, 15.0 W indkkcakts8qbp/ 7g6 8omqi9 w 3:uctive reactance, and 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 a0n hn q*j++cgnn 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 hajy9eb mh(zh)hkktub e*m3 , :5,bh2 fhs an impedance of 60 W and a resistance of 30 W. What is t* t , bbjhk):zhfm93khyehm h5 ueb,2(he power 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 19nh0r /mzzaf+*qukje-6wfd circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz rezu +n9d/mf 1h-kq z0w6a* fjpower supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in seri k,qkcl;k0m) qes?)0, ;kmqkkq lc

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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 wi0pewoeavlm+ ct c2a2c5/f 4lyool . /8th a 4.7-mF capacitor for a resonant frequency of 1c4a/pm.l 28/foy vcle0o5tcw a 2l+eo0 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 ind7g5qs 5kspypj9u)s ;uuctor for a resonant frequ u7ku5j)ps9 ;qs5gpsyency 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 plafkdez r hloh 3m-n-*x cva);5jhc/- h0ced in series with a 30-W resistor and a 40-mH coil /djr k vhh)c nxz5l0m *-h;ocfe-ha-3if the resonant frequency of the circuit is to be 1000 Hz?

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