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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 units of magnetic flux eazaelea io 0v 1;c:46gxcept

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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 indu- rh bwjwa714jction 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 vt-ik , qq;tk9what kind of change on the inducekqi,t 9tqvk-; d $emf$, 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 57j(8n. 5yde pt ng3ugqfi:baof the magnetic field through a loop of wire produces what 5jtn: 7pg3nq. 5ifu g(ea8dby kind of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a 0 xr)4(+c4 o* unagchgmxyff (loop of wire produces what kind of change on the induceg(cxh)c0o nm 4(gur4a+*yxffd $emf$, 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 a6gvbo,t6p r; h 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 curre /v 4yd(3dlzilnt in a conductor will be that which tends to produce which of thedi(l/d3y zvl4 following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is haj9q ty,b,cb+4k4n gueld above its center with its north pbq +gu,c akj9bnt4y,4 ole 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 magnet isy*+f1q xylfhyz+)5lf7 c dcy * held above its center with its north pole pointing down, and released. As it approaches t y 5*+q*flf7 ) c1+xfhdyyzcylhe 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 dz1gdic2p/ -dom3gxk (dcq(;a region where the magnetic field vector points straight up.c2k-((g zmqi pdd/dcg;x3o1d 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 table top in a region where the magnetic spgt+h(v5 cb -tz,9fjfield vector points straf 5 gt9c+hb,v-zps j(tight 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 in a sm;p/*ky n(cj2qj)z sregion where the magnetic field points straight down. The magnetic field disappears jq/ s)pym(nk;jsz 2 *csuddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasw4u+j cfg1r u3ing current northward. Tw gfjw 4cu31r+uo 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 w+2ih b1dutm hw79z2 0ag*6 fqh0drc lsith the north pole entering first. As the north pole ent0mhbc6 i+ l21ds2wth79 rda*0f zguhqers 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 whtlb+l (jtd4m9 nkhpu 2a68b)h ose directi)k( ualh 6dm4bt9j +h 8l2tnpbon 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 is rotated at constak4 :d5 ppntu4g,fmeb0t8bt -0 j* mfktnt angular speed about an axis whose direction can be varied. In a region where a u8m4 ,tb:0k j-5ungtdfptm e*k ptb0f4niform 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.h1t; p*yfzb lyi/ :y,q
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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 an.k+ bkc kgmb s,8yesh(s:1y+w $emf$ 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*x8qx7 rgj/ lx. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northward at co7(p 8dh/b:ib33rqpk v+zrlfcnstant velocity through a magnetic field that points straight down. Make a statement concerningr hc+837i/ rq3zbkpdfb v:lp( 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 atkmx+61e (3pekc v+ bic a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transfo81 j;rqv llxx:kfg49irms

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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 fhu9 j0/ 8rixu60 revolutions each second. The frequency of thex ju9fu0ri/ 8h $emf$ 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 t3hah 5aqvd*mzpr z: -8o

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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 thatropgdkn.q zu-, xrwu44 4;fa+

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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 j:ei fj/vkc)- pu;m2f( eea6pprimary coiluempe i v f2ckj-6 :(fp)je;/a 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 mfao0-)5:w c y 7csuciwx,. nqmore loops than the secondary coil then )snu w:57-o, 0cwiyc.qcfxma 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 inputc7k -z rvz)zvc)2yr: i

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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, (pc sl0rqo3s circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in 88kikbjiy .*4j u(gbs series to an ideal battery of constant terminal v 8*(8kb.usiyb4g jijk oltage. 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 cdiot5 v/ jsy3c8cqckks :0k lk7l*,o*onnected in series to an ideal battery of constant terminal voltage. At the moment contact s /3k0c dcyit*c q*okko7,ls: 8k5ljvis 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 nb37n d 036w4wwzzl 9bfq:njp2pr lo(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 withg+izujn 64-s lkgu/q(s6nob7 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 ind sbmp n,br:8*+2jfimkuctor are connected in series to a battery. The time constant for the circuit represents the time required for the 2jm 8r*s:mf ibkn+,bpcurrent 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 to5 kuj9cdxbr k1+ /foj/ a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to+r15 k/jb/jkuxc o d9f 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 unizl7m492:pops klw ) v,vvcpz :ts 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 connecte4vbt0 d u-ruiy1sq ;2pd to an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this cir2aob1h d 1b3bqcuit, the currenoqd1 ba2b3hb1 t

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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 chang-6(* wu2 bkecxx7hmnj es by what factor when the frequency is tkx m2hcu*j6nx(web 7-ripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, thlg mc ; vt8*zavq87j8hg98pw me inductive reach8*v ztvc p9 7ag;mm88gqj8 wltance 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 approaches;zk 6hh3/sih g zero, the inductive reactkz ish6;g 3h/hance 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 tok*mr)-o v(3 dm *kkmlh an AC power supply. In this circuit, the currev* hl-mm*ok(k3km) rdnt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance i2 a8xp* qq7pdtn an ac circuit changes by what factor when the frequencyqd2qa*8tp7px 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 vol/upfu (aregbm . ;go+f:64pdx tage across a capacitor approaches zero, the capacitive reactance of that capac+/o p( upg.budm6f4;r ae:xgfitor

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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 betwe)dw2 c/m1q z1wie: 94kguqyjlen the voltages of the inductor and capacitor in a 1 w)9ijqml/ez:1y u4 qwc d2gkRLC series 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 R d: r84g2(zunklvayc7LC 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 on3o r2i) c:rb7dxt8 i6mwhix n6 /o0lef the circuit increases if R increases. When is this statement txr 7coli:)062wdrim3i obn68e t/n hxrue?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases n8b. descbv .s0pzy( :vsd3 tq8w o-j: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. co8sy0e lnqu5 k8fctw:m+g6 2 The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuit, theu xk+x,w9x1 9r qjjsaf4m2ty,o 57yms resonayk9x9 jw+x2fmx ,ustsoj7,y1ram4q5 nt frequency 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 vol.p2lwhd 0va.+e 6a tmdtage. 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 occu-lw w +jky0sn :6l/nrars when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0wepd ay7(c fy-ku2 7u2.20 T. Find the magnetic flux througwu ykc (p2fy ad-7u72eh 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 radiuxdiwypk.mmfpk 30t:tgz - e3:r0 zj4:s 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the looptkw:kx:z p3 rji.e :0m-ydmz4 tpg3 f0 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 0q tg bw,0s tvhlw:rmqc82 * )f sj740rhvc-u;w.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane;0: wtq4wq0 s v *7)rws-ugjvtmrhcf hbcl,28 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 singb3 zhy86iv b(yxebke*2zylr5zc ;50 ple 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 change:*mrlrwxep g4/st ;i4s 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 turnspm/3zydah be8d dybe70w8*) s of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes udm 7 0y s*hwbazdedeyp)38/8b niformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15c*r26)hstwom,dk , a f 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 ) 7ekmtpf) /yju 0y8jd$0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at px2rqr 9r)1qh a location where the downward component of the Earth's magnetic field29q1r ph)qrrx 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 ir--21;ie vmk zwyxlfd8f k/2 hs 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends whim1 kv/i-2hrzy2f;ldfw exk8-le 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 -+pskqn*:q cy50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists ofsdbhm 1m apeo284z4 wx/as8n( 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangx2j,d:ez* :y r qos;msular 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 rotation, what will be th:qo drm szs2 x,:*ejy;e 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+p (xtfoahct:5a h c-z41lw6n 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 AC generator with an output ;i5nib- rfx+ 8o cttx:of 12 V maximum when rotated at 60 H:f- t i;bn5t8i xxc+roz. 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 wituna);u; 6r ie l8e3snzqs0w7 ah a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistancer hrz u ;v-.obn,r+0,jf )pjar 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 mc j7am7 bik2 sc-mt;w2otor have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a backikc b7; 7catmms- w2j2 $emf$ 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 cskjqh5 exnz cn9/xd96lg 2 0k9onnected to a 24-V power supply. The operating current is 1.0 A. What is the start-up current?gq9nxk clex0 9zj9h2/ns d k65

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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 internr,r, mtxjv 0xy+e0.dn;4qyl d al resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 Ar,e nryjm 0.4vl,y;d dx+tq0x 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 is connected to a 24-hj7rdjyz3tu + w +99oc7bmxx. V power supply. The operating current is 1.0 A at full c9o39mz h.yruj7 bxt7++wd jxspeed. 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 primaryyc w2 ks ,pg4ir0fg;uw gh;9l: 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 tranrukni3 q;q+io5-z 1ve sformer causes 14 A to flow in the secondary. How many turns +1e i-z5i;nuqq ok3 rvare 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 primary if the 24-V s.1e p h.1o6v:b *iokqmll-xrrecondko*lo.i ebr 61p1.vx-lrmq: hary 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 pri: xpp/s;li6 ximary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what:x6isl/xpp i; 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 q- u)lr u-pyi1transformer. Assuming 100% efficiency, how manlq-yuir u-p)1 y 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 a neon sign :i+cuh*6vwt o r s01hotransformer provides 7500 V at 10.0 mA. The primary coil operates hs o*oh:ciutrv0+1 w 6on 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 its primary coil and 300 turna )rjkv+j-c -as on its secondary coil. If 120 V at 2.0 ) jacva r+k-j-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 primar l5ndpkur,4)s2 lm9p wy coil and 300 turns on its secondary coil. If 120 V at 2.0 A is appliekw5p)mp rl9unld 4 2s,d 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. ;x/d5lm: pvher; wm2 lIf the input current atm5l/lrh:vxde;p m w2; the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a tran;v8np;fad ;hi8zytj5 s 2bs-be2 zvd8 sformer has 100 turns and its secondary has 200 turns. If the input volttzfa s nb;y2v5dbs8pdi8h8e2j-z; v ;age 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 has +313 lztytvont2 e9g:j lr8ws 200 turns. If the power input to the primary is 100 W, we can expect the power output9n 8tlrgy vj tslwt33:o+21ze 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 usuallyi1//yysa b 65grzwob: stepped up to 4500 V by a transformer and tryi s5ba :oy b/wr16gz/ansmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at w0wsil74.iz4.b86zak sc zxp p tl7r(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 percentagls8.ppb lzri( i 6s7k7xzz0ac.44wt w e power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually +xgfbj bu n0tqz8*12k stepped up to 4500 V by a transformer and transmitted through a powbfg*ktq0b2 x n1z8uj+er 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 kfjhhj uxy)* ,(m 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 transmissio xhj,(f jy*)uhn line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total r8gtg.zlr lw gm c//(22pqeo+desistance 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 stepq2/ g8pldl z/egt+gwo 2.c( rmped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1i*y7mu x5 *w4cud x k5j.;fwgn v*5gus000 V. How much less power would be lost if the powerm dg .wk;u nfj5v57g**w *sicxuuyx54 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. l(f/ k21vgz gn)f 5bvka+w/t 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 the power loss in transmission is not to exceed cgvb/tk 21f)kf5+ /vlwn( azg0.010% 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 storeduudhh tb(+jt6m 7d;y) in the coil's magn6 (yuh t )tj+d;bhdm7uetic 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 ich2lam y k shlrzp19,whe95/ p 36kle,nductor. What is this circuit mal,pw zchlhr26ys39 p1hk9e,k/e 5l '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 circ4oq 1py91ntssaj ,m k2uit 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 placeda th6 h, y)7p9bkncl1a into a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What o k de9ev7+e)d qqd;w6is the resistance of the la7dkeq)d9eqwd6v; e+omp?

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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 powv71:fy1 pdu oper supply. What is the peak current through the resiuo1f1pv7y p d:stor?

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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 the power diuk3x( )ac6m7ff5lo7rq.v z xoy;* bb kssipated in the resist3x( 7fqoz5kf;a.6 u bxo lv7rm*bck )yor?

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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 resid8f0e uny5qwe44 0 xdry4kw8tstor 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 5bj k6w.c3jn7 n0-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 50m t-6f07 cbniy-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 induuti q72vz7ns fb6r40rctor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil a ercdr)hn8s /+t 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 3q9qu/iz km r9of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessalomqbq5aq r:( * 8bs.vry 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 when adhz.j b4tji +b,.d50w* itc w120 V AC at a frequency of 20 kHz is applied toth+ci.d, 4 t. 0 *wjib5jabzdw 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 Hz soutda- r5 zugmx4:i) xh-rce?

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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 reacta;c5 bm +zqy0xd f 4hbkcy3a::ince of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance /b/it1:hf-pz xvxsed: 3fb i) 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 hau(fo) ,4sy7r jv1onqjve 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 reactanf6dl ,ta6vd c9ce of a 0.010-mF capacitor be 100 W?td6fv 69c lad,

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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 a (8eekmuq) p:zcc;*h ind 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuitb-x)y9lako9wk z c1m5 with 12.0 W resistance, 15.0 W induc camw 1k)lxy9b5k-z9otive reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at +otar nrlbubbp0g/;p idv(j7 :c (i):1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-l acip;)(rbt + nj(:/bgvpo0:d ru7bimF 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 100-W resistor, 20-mH coil, a yvkm )3vy1)0 6pjqiuevo,x*u ng 4fb2nd 1.0-mF capacitor are conne eoi0*) fupxkg v)q63m ynb2yu1v,vj4cted 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 serie +lfrbmuhiw ,rc t599l);eu 6hs with a 20-mH inductor, what is the impedance a 6 ,)hu f;w5m9elbr hrl+tiuc9t 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-m i//br*j9j3 iayz;cyyo /36jl/uk zgmH inductor, what is the phase angle at 1000 ii3ycgbr/jo/ku lm y/*jz/93za 6yj;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 1gr5e7 6qxq7qj .0-mF capaciqj q7gexq 75r6tor 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+33o brvdr+r20al4 y g *vfcsv capacitances is needed in series with a 100-W resistor and 15-mH coil to +yvgfrv3crs3l a*24dr bvo 0+ get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for c69jzuugc-pal e( r,9a total impeda l,ue(cjarcp6 uz99-g nce 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 in series with a 100-kW resis.bt/wscg lkz/) 2c6dztor at 1.0-MHz for a total imc/ dzw. z/t6ksg b)l2cpedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a*q-z1d,+y; hmd -niu9ko *tq8zrf yde 20-mF capacitor. What is the impeda*d;yqot*8y-z- + n,qufd9m idhr1ezk nce 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 (8gb*luc a: 1,-cbi3ltufnnjl q(o,p a 10-mF capacitor at 1.0 kHz for a total impedance of lt- c(:plbc (qg3fun,o,ji1au8 nb*l45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-my+7o9s +xswk:3m nfwxu /x(se F capacitor at 1.0 kHz for a phase o wyx9k+7/3ms(n ex sx fu+ws:angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3(-:ua0lnh/9; oxtibsfw-c q s 0-W resistor at 1.0 kHz for a total impedance ofh;sn icab - wt0-( fs:uo/lq9x 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. W co8znx(ilr4lk:i).k hat is the phase angl4ziklc:nkiolx 8. r)(e?

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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*+jne vnk ,b 4 5csv4ux7fgxx(.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF e44 +fcg7 xx*x(jnk 5s nvvb,ucapacitor 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 capacirf0fn c2o+ 2ibtor, and a 0.350-H inductor. The circuit is c0 r+bffn coi22onnected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive rpgyu1*j ng+z4eactance 30 W, and an inductor of indugg* 4jy1pzun+ ctive 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 :90 c:gpypgrzseries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz :pgpgc: 9y rz0power 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 wika ehoxi)uex v a i*ct6z4, n+vni0*o:l* ka71th a 500-W resistor for a phase angle ofk kahuei4x6 7a+*ci*za)x 0io 1nn,ev tlv:o* $40^{\circ}$ 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.n ts7ur9dkxrq4cq 5,az( ; xi+ax28yg At what frequency should the circuit be driven in order to have maximum power transferred fairt 4ankucg7,8xqdrzx(5 + xsq29;y rom 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 ousx v ,ipw);y-ptput in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when tw)s;viy-pxp, he 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 cie;l :;6cbf kmrln 7hip/y9t.grcuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. What ifk1 ty* *lawg5s the power factof wly*1t5g*k ar?

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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 RLCo(f8+l-jtfk-n tfa2 f circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected-(+ff8kto j- afn t2fl 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-sdl.og)yi q b tpoc62rq.9t3 xh1s(7s mF capacitor and a 15-mH coil in series?.2yp 1sgi cs7o9rb q .t6dx3qsto(h)l

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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 resonant -9b*ftsciay /frequency of-9 yc*b/ tfias 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 w*vfv vb03a z588 jmneseries with a 3.7-mH inductor for a resonant frequency of 1000 Hz*vvmnze35v08b 8 ajwf?

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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 seriesglbtsj8 qpy:,dx* 3 j0 with a 30-W resistor and a 40-mH coil if the resonant frequency of the c 0qpb,yj tdgsx*jl :83ircuit is to be 1000 Hz?

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