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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are un()7rqg q;j anu qa4k-4jpwnvb88w,p rits 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 induukqp9t4yr 9 e,ction states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what 39 gt)qvnd:7ix euib-kind of change on the induced ti9e-3bug 7d:vq inx)$emf$, 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 magnxdu4 swrf(;5ha kqmg 9;qk/lss0)jp. etic field through a loop of wire produces what kind of chawj.;s a5sudsr9g 0; (qxm)l/q fpkk4hnge 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 lfb*t)275)rw d iok*9hjb xjzv 0k7yhkoop of wire produces what kind of change on the induc5hk) xbo jvi7wjk7rtd)2y9 *f0z*h kbed $emf$, 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 f 3k1,zh hw6yz 4zkmfgrk;if/lrg69 p(rom a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced currag kb5q)8 -hrtent in a conductor will be that which tends t-85hraq bg )kto 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 tablef4r2 oj:pw z+it 3t9ds. A bar magnet is held above its center with its norwp9:3 j4+ f2izdtsr toth pole 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 2*/ 0f ykmsqfq-sjqa t6x u61umagnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling qu/f6 - 60msqsquf1*xtkajy2 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 vector poi j n3o1 hkpdjil0l)*h-nts straigk *0j)hn1 -oil3hdpj lht up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level/ib9ryq h *b:x table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above rbq/i:h9yxb *, 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 hxr pc;hv(bw ,-orizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenl;xp( rh, c-vbwy. 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 ho,yfz: h:ypfr0 rizontal table and carries an ever-increasing current northward. Two coils o:rzyy:f phf ,0f 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 north pole t9 -5lbo cj,,+tl5qycd:tw*wsv mzm -ukz 7,aentering first. As the north pole entwa jmt -uzz:,lyvcdl+w 5q5k 7 ct,,-os* 9mbters 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 isx(uu ql-ez s 6l0-z0-ws5fjgt rotated at constant angular speed about an axis whose directiosqe ltgjzs0(xuf 6--l- w u50zn 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 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 ww h)fp/l i39,0jyzavis rotated at constant angular speed about an axis whose direction can be varied. In )i ,9hp /jfw az03wvyla 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 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.kg+ 7( cksthf(
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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 that aneljx6b mm 3*a9 $emf$ 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 magld(st1 b (5dto ss b50tv3a*lznetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-wevuk5q vehqh ; z*b:z,0d l+pv-st direction) is moved northward at constant ve, hl zvvekd+bu ;0hqzp* v5-:qlocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angularrs*h. bj*nkpszv, n(6q- ea3w 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 transkh7shrn7q ;svxx- 9j1forms

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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. T3 .xkbk3pz z+)7 dkxc *pid9jhn spb/(he frequency of the )9+ p7. bpzd dcnxzhkx(k/s*kj3b i 3p$emf$ 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 tohkk tm6-gthv na(p.j/o 1f *f(

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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 t*cv 1csvr*x q3yxe);rhat

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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 co 6,t4zgh61jtimr/dkc k enz,;-uhu8 sil contains more loops than the primary coil4;ctduz mu/ srke1 znt8 hj6h-,ig6,k then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the ofn5 h(4a(4tvy;o msz secondary coil then it sfz4ohm;(ov5(n4ay tis 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 44owni zqg a.7uj0or(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 cimg 5g.z+2 tef3t0jt tprcuit,

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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 arv)raz kxb4)qo94 gt,ee connected in series to an ideal battery of constant terminal voq g, z9)va)o et44rxbkltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series t)/4/uyv3;)sz8ywe z pry bpskgoxv6qqw 71 f0o an ideal battery of constant terminal voltage. At the mo7p1xzpv veu)z/wq;sy /r 4 ys)q6 bykwg 38f0oment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and l)vgrr fbznmjk; 865-h)m)hx-)bl jt resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inm+7iul 43/ t,iitwrinductance 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 i7t5clq 4gpf 0rn series to a battery. The time constant for the circuit7l4fp5tqc rg 0 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 seriescyd 9u.*7c iid7t0q j-en(rxr to a battery. The battery is suddenly removed from the circuit. The time constant for of the crydc*q9 t7rxen cd.0 iu (i-7jircuit 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 unitsj(;au)sni+u u 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 j tq8 (,z61+3y)cq-gyoweldt/l im z npower supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC powerr:dparc, v ;*uxro,v( supply. In this circuit, the curren; :axuv(r r v*,cp,rodt

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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 circuitfqcffcl5 :tzr8 ycu; +jj4o62d f+ur: changes by what factor when the frequency is triple jc+lt6uqff5; c yrz jff+48u2:cr o:dd?

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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 aczjbyy 3vkahbr2v)le81+ c4q. ross an inductor is doubled, the inductive reactance of that inductorh bya2jce. bq8vyz1 kv+)l43r

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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 vgs1cr4/nc 2 pf+4tcsi nz k(0sd,uwn1oltage across an inductor approaches zero, the inductive reactance of thatk ,s4 i+c2n1 z1fsrdnt 0u spwc(g4/cn 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 ga9e3 g3a9enx8mbyn rk s2 )i;power supply. In this circuit, the current 9 iay nk383ranm )bes2xg9;ge

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance invua,z psh9a lmgk21a7olq*:2 an ac circuit changes by what factor when the frequency 9s h2agavoql kal*p ,7mz2u:1 is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage acrosll2r uo0zh *mwy q1m+a7:wp5 zs a capacitor approaches zero, the capaci 0wlh5zmwml+uz*yar7o 2q 1p:tive 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 voltages of the inductor and capacito.9uptpupl4 zmjtcwr 47 303ad r in a RLC series circuit? 4z34 r tpu l0pacj973.mpwtud

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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 def;y1d4jcvs) 3xeup . mrined 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 b:t3q4ynwbe .increases if R increases. When is thisbq. :n3yb4twe 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 impedang2mu6hqv 4r+r; 5 ergnce 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 the circuit increases ifbuj47e 8k zoh k,gq(r*(m(ykd $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both dsy04i o- ne.e i/3(k7mxmrm uzouble in an LRC series circuit, the resonant fr.4k(3roze /mm yxim0 -ns7uieequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. k p7 nh6dkaorhq. h7o:o3za);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 ocd(p:gi 6 w2asscurs 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 radiuo5b:or nh;yx+ g 3v2etu a5e;cs 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plg :+5oha r 2xv;e5 tno3;ubyecane 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 reti4n5skbh+-g;bh1 7r7qq)qw 4 q kpdadius 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 the loop and the magnetic field vector are ptk q7nh 571w-4q dk;rpbq 4qh)g+b iseerpendicular.

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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 uniform magbxi; 0n.wy1 *j tko 1kwmd-+bnnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the lo- bb1 nkw. 0n1 xdmoti*jk+wy;op 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 adjustnxlp.z)2. p6q 5hvahnable 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 cha(*llzp*ty:o o) y 0sfqnges 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 frt*:qci *.1a w ev( ;crp7kfeptame 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, find the average value of the indpqwtf71aeic p(v e*r:*.tc ; kuced $emf$.

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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 2 qkg)fa mq3z8w+bx7q;sz6x carea 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 r-0 hj3ikgq0 sptunr4i9:hl , and 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 spau iu.ikz*yk7 t u+)k/cps,d jiu)20f pn of 60 m flies horizontally at a location where the downward compk 7id/*kjicz.20u tp uuyfp)),+uskionent of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constux8iz 0rt qnzigl(s snd34sp0 25 *-obant angular velocity of 2.0 rad/s about a vertical axis throi5*n n(r gxs qbs d3-slz84o0 izt2pu0ugh 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 and a cross-sectionala7 +.n 7euq73cykux dr 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 of0wbzbpq0av8tqms6 -k3 i(qd3g7qtm0 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 reclsu emky*3 tgj 7)(ld/tangular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of 3j lt )/uglm*kesdy(7 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 100 turns of wire of area yjub3n( 7 wo6sz,m4t:j* qztq $0.090 \; m^{2}$ 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 ofng x2oigvqd,2dwddgp(h- xz;5 l7i+5aiz1 r1 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the ar;nd2 -zidz,1igix1 xhra 5d5g ldv (2pow+g 7qea 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 wa mh1:nfts (+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 havem tliiqo+n pu5)5 j1t, a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The mot ve,78xu yn:.+tug1 twxiah2b or operates on 120 V AC, and when ,wut1:yxh7 et8u2v.ga ib x+nrunning 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 power supymh5 bf,+:k :ec i4hqmply. The operating current is 1.0 A. What is the starcq4ey : mfhk:b5hi,+m t-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 interna-4l(l0mo5e telwjaz d d6 w(0kl resistance 6.0 W is connected to a 24-V power supply. The operating culd -5l4 mje z0(eod(a6t0wkw lrrent 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 internal resistance 6.0 W mnsgkd+.z2*c c p6q/n is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the dmpn*k /cz +6cg.sn 2qback $emf$ 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 voltagex ,( p35( f7sxarfjycv 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 cuipszl (aeiv+ xoig.i98voa- -20 2jm auses 14 A to flow in the secondary. How many turns are in the seconiigp a2v+ij -alu-02ie 8o xs(oz9vm. dary?

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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 primary if thcwrz yi47,cdr 6sou;fp)0 +rwe 24-V secondary has 1 ;0dp4wcr oz wyc)6sr,f+iu7 r00 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-turn secondaekd xpx2720sqry coil. If the current in the secondary is 3.0 A, what is t2xd 2 x0qkpes7he 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 prim -badlv .1skj-* 6)x euiju:cmary of a transformer. Assuming 100% efficiency, how many amps at 24.:ak-1*ueidvcb js6jx l-m)u V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a moms8fx. f jfh4(i-ur2b*1ppneon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What dos jxoi1up * .mf8b4f2prmf-(hes the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its pr 5s5zx;8u k3l fsk 91qirr(vst.3hshzimary coil and 300 turns on its secondary coil. If 120 V ut .sh(lhs5f33q x9 8i;srkrskvz15z 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 primaryukcm g; 7ctc .94hc;ps coil and 300 turns on its secondary;gct c.4m;97hkpcc su coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. f95g vah q6.h:zg owgtrc - m3,df0(6dvqwrn- If the input current at the primary is 100 A, we can expect the output current at the secondary,3dqo t-mqf9r.6:rd 0 hhnwgv6g w(z fca-gv5 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 secondh. .anzzxrzxj n07pgh 23(l b0ary has 200 turns. If thp zjh3xl0. h(zagrzn.2n 0xb7e input voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary hams6m)fgl4gqjn -jzh01(h w 5fs 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (negl q hgw gfn54(0m)mjz-s16hjflecting 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 is3 t ftwgfh tt4))(cqv3 usually stepped up to 4500 V by a transformer and transmitted through a power line of tot))tg(t tf v3htqc 43fwal resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 1banfjb4u /mgr6qf.j) t *:+3rf8uttj 20 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. qnrf*umj38r6 b ft f/ bt)j4j:+t.gauFind the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces oe)8fkl* /54oh klext60 A 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 resista) / oofet48kellh *x5knce 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 0.60 W)qy4uj w m7p,k. 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 if the transformer were not us jqu,mw7)k py4ed?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmissiona*jdk/dd 4t/ z8id 9tc line 50 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 with a transformer withtc d/d4idjtk 98 dza/* a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much qptpsn3v s.f9 56rzcx.n1* kqless power would be lost if the power were transmitted at 3000 V insts3x..9 s* rfnpc1tpnq5zq6vk ead 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. )tsragvk)l*i p(k1z5 It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed1(5sli r)pk) *vgzt ak 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 currentt,ey hmw9stmtun/0 9 7 of 5.0 A. How much energy is stored in the coil's magnetic fiet/ty9n 0 7u,wmmt9she ld?

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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 awy(k24dd (ndr qf-yy(t vb* ,and an 18-H inductor. What is this cafv*qbyt ,(4kd( d (2rnwy-dy ircuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where t (s+ tdwuk chx.)je2esjh( t.s86hgr8 he 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 (kkpog9uhd-pe ; gue 1.f-qf 403xmctoutlet. 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-xl6 xay(0hs3 of+ns6 yV AC outlet. What is the resistance of the lay6xoy6sa 3hnfs( + lx0mp?

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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 aosr z)7t) *jofc power supply. What is the peak current through thezrs oo)7tj )*f 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 power supply. What is thg/my7ksi o49me power dissipated ym/o 4gks 7m9iin 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 ref,iolk3g 2fd - ucu c6f+cq1h,m+ (ztqsistor 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 at/nfde6h80 (za ns11tep n(c3gy3l q z 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 y3au 4oh;8enfdjse17 -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 Hzfleb+d: 0crvv3,0fe v9/ukdw?

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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 *.gzu0g)xd7tl e3llxof 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 inductivf, 3/x)utm 16x eqdocbe 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 necessaz6d .at5,sintry 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 in, 7z8l nm:gxd9rdrir 5ductor when 120 V AC at a frequency of 20 kHz is applied to l7:9 r58n ,gzxd rdmriit?

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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-m4+e1 t,p ytm esufry 4ywp3g89H coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 kHz?oa*24( *j cue*qbj2 , avsasve

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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 rea9u 2 nwb ai 5m-t3jsw,g5gf+jnctance 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-zrey/ raa335 qmF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the ca e:pg,- o(o w*wu6w/bleg+o repacitive reactance of a 0.010-mF capacitor be 100 W?w-o:ew u6/ w,reep glgoo*(+b

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 5.0 Vkx6kb 8xte( t.?

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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:jw) cjnipu1 9l4a zs2 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reacta2aju)wspzjli14 9:cn nce?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at+e8sv3rx kly. 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mer.sv +8ly3xk F capacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a baxs2+ylb1qfs, +0mw100-W resistor, 20-mH coil, and 1.0-mF cab1wqf2s0asbm+x + yl,pacitor 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 connen1tth1 86wqjul u -l)lqa)f3kc9bz(l cted in series with a 20-mH inductor, what is the impedance at 1000 Hz? 6z)38 (1fl)nl l ub jqu-hqka19wttcl

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with aiz::lq +.a6dighnb4 a 20-mH inductor, what is the phase angle at 1az6 abhdg. n+ili:4q :000 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 adjjvky k* 6+d7 20-mH coil and 1.0-mF capacitor for a total i+k7dk*j yj6vdmpedance 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 seriesqe4 y, ss98mgd with a 100-W resistor and 15-mH coil to get a total impedance 8sg q94es,d ymof 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 qt+mwxx+w v0cm j(u8 x (cp-1bbe put in series with a 450-mH inductor at 5000 Hz for a total impedance of 40000 pqtxcxw(mb+vxw8+j u m1 0-(c W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for a (kxi2l6 xo3z1d ,mvygtotal impedance ofvl(ygm z ,x6o kx12i3d 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is cp bfc1k1;2uoi g6 784noi1v nkj /cczgonnected in series with a 20-mF capacitor. What is the impedance 4onckv7z;g16/ 1bug i8i c1 jcfokn2pat 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 c2jjc/f 3iiq1)a ybf2 bapacitor at 1.0 kHz for a total impedance of 45 W?yi12 ffb /b2i q)ajcj3

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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-mF capacitor at 1.0 kHz for-k2):i ewjsx svsq-*i a phase angle of*svi sxe 2wi-)s-k:qj $40^{\circ}$?

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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 reski fn5uix4ojv3 cq i 8,x(2i:bistor at 1.0 kHz for a total impedance of:4x,jki3ix2ui5fv o ncq (b i8 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is the phq-07 y ii-hqmyase ang m70-i qqyihy-le?

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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 a,cox.n 3plsjp:-tqfxk9u 49 a nd 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mu 4:xl ts9p-nao q xck3f.p,j9F 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 1-eh07tm srgwyi fg9 )7xicq,a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hzqgisfhi1xg7 ywte7,9-cm )0r 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 reanjrs vv 2m2m wx(0-7nzctance 30 W, and an inductor of inducm(rz7v0xnvj s-w22n m tive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a ntnlo7 8vv 9d2series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, whe 8vn9dto7vn 2ln 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 resistor for a phase a tx2ky8cyf3uh,k mf,1ngle of8 y x3c2k1,hk ytu,fmf $40^{\circ}$ 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 =(qkw nz*5( sin 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have m wk*(zsni (5nqaximum 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 seriegozg0-1gyeuzk7*:e7nyh:/n (ds +lrjx 3pxb s circuit with 12.0 W resistance, 15.0 W i h*el7g xx:7 : sb+un y0 ozjgnd3g(z/-per1yknductive 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 an AC circuit iedp81l*jwr)bo w9x/ks $63^{\circ}$. 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 il7e y3rcj7zr(mpedance of 60 W and a resistance of 30 W. What is the power(zlryce7 j7 r3 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(; ax5oekwv (tn*1bnbc8djvm/az ;r8 50-W resistor, a 10-mF capacitor, anxt v zje*o;v8 ;cwba8nmkb5 r(na/1d(d 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 j:mgpi/b5bi,yk e+1 0vl qu-qand a 15-mH coil in series?-:pvj5mbiy+kq e,i/ blu1g0q

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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 capa-5ogm -61rj4zoz deywcitor for a resonant frequency of 10o -z4 rd6w-1joezymg5 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resoh l2fl7zx:e6hnant freque:7h2 zhe l6flxncy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W gp) r,t5tsu9d resistor and a 40-mH coil is5ug)pdt9r t ,f the resonant frequency of the circuit is to be 1000 Hz?

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