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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 units3ou l g)rufo,/ 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 induc+v t9l8m+vyp e1z*zi ;g,j qzntion 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 coiu j:.0xqx2 9jpp6lfn vl produces what kind of change on the inducelqx. :9vp pn2uj6 0fjxd $emf$, 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 producew5f.oxc6qi1v8g9 ncx s what kin9oi1xw.5gfvcx6 c nq8 d of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind ofqy0jf s+1kvh)5 qy x1l change on the induced )+k x qjyyfs5hvq10 1l$emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field anfepwu:e08 5td $emf$ 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 current8vmbycd,8t *kh :pangna) 09ypsuv3 6 in a conductor will be that which tends to produce which of the following effects?nh:ncy )v9g0va,pps3bd u* 6t a8 y8km

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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;n(9qat5: qo jc7 hfpeu6c 5qk. A bar magnet is held above its center with its north poleqc f: knqtoqc7u a(h;965ep5j 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 horizont)i l(codhpgaz(a3.uih +r3b+al table. A bar magnet is held above its center with its north pole pointing down, and rell3 3ho + ibc(rhiau +d.gpa)z(eased. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on qo7baz8 at 5)ba table top in a region where the magnetic field vector points straight up. The magnetic fieldt)qa75a8 bb oz 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 jq2ql h yvi -qb -jj.8h 21qc*4*gzziq,-eqqewhere the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the dire*l-hz-ehjq8 j,zqb1c qqq.iyjq2 q i- *ev24g ction 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 rek rs+58i/uuvagion where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced8kru su+5a/vi 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-increasinro2herx2 la64g current northward.226hl raoex4r 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 ofpwm7tt/v r3p)9ud n)s wire with the north pole entering first. As the north pole enters the wintrt3) wd /u7v p9ps)mre, 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 sp6*5oe nhncmb3 bsn *vz9srt7(eed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight dowv z97hont6bb mnser*3c*s5n( n, 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 angu1 u,f.ijd*cl92wvenflar speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straid2jef. 1, w*lun9vfci ght 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.jzq+c .-fvi:ge1 bf/pe :oj eqi(z07q
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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 anzb;aygo71 e )q $emf$ 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. Theneo2ofhuf t),yu/p e;8*utn 7 $emf$ 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 f cao* d:6ius0at constant velocity through a magnetic field that points straight down. Mak6 ics*0:oad ufe a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular jduc/ 4pbp/v(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 ;nu*7 obwd0pc8ucy 7 stransforms

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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 secosocj*vxt/y+jgw60 x :nd. The frequency of thcx:twvsjo/ g60yx* +je $emf$ 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 r/bvekcq j g.3s7y+biu0 x:5(xq ooz:used 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 devichvv2,)uihlwz r2k 5( /f p/zvke that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondarbo o2k k0feiy;md23p4y coil contains more loops than the primary coil then it is apmek0o23 fk2 o y;4bid

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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 molsdd(mo4 *(l4o gir2jre loops than the secondary coil then jo4*l 4(ms ldro2i dg(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 inpuh;j1whydx.1zd f c2i4 t

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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 resonantcvb-*2vyjd -h circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal batter3/y2 36kc5e bajjsp wb8,mpf cy of constant terminal voltage. At the moment contact is made with the battery, the voltage across8 f /bcams kb ,pejj2wpc5633y the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to annnndxxo ,) lkp; r(0s+ ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the k)n on ,s0pn d+l;(xrxinductor 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 indf6+oam e(j a :jh.mp26o6pg dyuctance 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 waj1he/ct1ge.y jbb:r 5tw m03 ith inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. 5-wvo7s /ka2v1:hih1gdzjj/s ie(jd The time constant for the/ssjgi:h 1e/k2ivoddja zv ( 5-wj17 h circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The. itzho33p gf gdt6d;nxh-: w, battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease to; -nt3f: 6ith3xhgd do, .zgpw

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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 s qj, ndqz:.f6xame units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, i;drjg6-t; ds8 ,w dxxthe 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 :c7*m-nxurv ir fzvbge9 );gr;v69z ma8vq.t this circuit, the currentg7 .8-e rrr)m69nmu;v*t;z v :qfg9 baxvzvci

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactah) g hi6 khclis*78 -p7epk. kwmn8j:mnce in an ac circuit changes by what factor when the frequency i8 pj hemmpc8kh kg) -ih7.si7l6:nk*ws 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 inductor is doubled, the inductive y;0 :a.y x2aeca,p;zbfsqw:oxeaqb;. 0c:z,s;pfay o a y2:wreactance 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 zero,(-q - r ruin4qpf1a+tz the inductive reacta(ur- - zfipan4+qr1qtnce 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 circuit, the curp 7h3h5wp8+ siuzpvv 0rent v 7s0p8z3ph+uh5wipv

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit cha:vp rk0yw 1 he,(/*. )vuzoru 6k;mtktgvs+ banges by what factor when the frequency is tripled/ ;+ua vutkb.,hk0 1) oypskgm:* 6tzewr(vvr?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a v0g, 3k q(vdvrs4clx8/ nd7zv capacitor approaches zero, the capacit8v l v7k gcrns(d34vv0xzqd/ ,ive 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 voplzaa.qbsej54y7n2 h (se 4u0ltages of the inductor and capacitor in a RLC series q4j(7sauahsze2e0p45n b y. lcircuit?

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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 cirhd:8trj p,c4gcuit 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 increasesig 2jxv9k0 i-)0ws1awn0 xp dz if R increases. When is this statemen i9wakpvw 001n-0)gx izds 2jxt true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the cm8i*rr+krv osmafhqdj2 33 6+ircuit 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 circuit9f v6h3-3 xwu*zbjv d y,(yihvm)iy*a. 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 ang b:v ah2i7a+1 nnco9pd the capacitance both double in an LRC series circuit, the resonant frequency of that ciohab2gnpv1 ni a:9 c7+rcuit 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. q 7(bv8m1) zy *dpzmfxAt 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 Rxv+3u 9l2uyi fLC circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 9m )a tfzr5olpa(g878l nzt 96r+ssor 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the r5as9nsm zl)afrr g6 ol7z+p 8ot8 t9(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 radius 0.10 m is rotating in a uniform maox 4mbymyr./1gnetic field of 0.20 T. Find the magnetic flux through o/y m1 4xyrmb.the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of ru* cgwmc8m-((su jkp7 3 jg9bay5r0k 0.20 T. Find the magnetic flux through the loop when-(jrp 8 g (uas03cry79 g5wkkbjum *cm 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 ipw: royq*thz7x4q ; j3s 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 chy* c o *tt2lxaz4ld5a-anges 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 6226sh.baypv h vl,p zwire 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 uniformly from 0.50 T to 0 in 8.0 s, find thl6p22syavpz.h6 h,vbe average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 tu+va9dx/ - qgy cik0t2hrns 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 awf/rqta s*d.j. 5e+ wgrea $0.20 \; m^{2}$ 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/o; *ndxp(romf0ys 9e of 60 m flies horizontally at a location where the downwaryoed(rfsx ;/9nm0p o*d component 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 tho:idm,gh8bd2vz g jt xd/ 33m b,;1cypat is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis 2 do3 3d v;b1cy:,hg,8tj pxigmm/zbdthrough 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 crossa1osd( h,bus8 olqd* 6-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 tsunkqigj 2z 0p t6mmk)lv(; +8urns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop ixlhgg /s 0r.qbf xef:b 31c.3*1zg rlus 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 gen .fsz hb .01gbc:1rlg3x/qfuxerlg3* erator?

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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 turskq++q4y b ku; f0n6p34vr gkyns 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 a1lazd,.yqjg:6 v2wezdo+5 st n output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is availal e5 :.zsdywq,gvz 2ja+1 6odtble. 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 gemc.8no zmh-w0id ,b)f(qeo8 inerator with 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 resistance of 6.00 5.4fr;ca l :frb+n)epvc1dkrW. 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 hh c 0u-rzq6(*r:nzgrwave a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed irgz0n:(zr*-wch6 urq t 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 +lkk- ki:/2l +tsriglis connected to a 24-V power supply. The operating current l+/ gkl2ki:s krl+-i tis 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power suppv1o kh l8t) q/i7lqhf6ly. The oper7 kqli)6h tvlfqh81 /oating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power47gpnze bwnykt/6*3 ;hkvya: supply. The any;:gt h7k /n*4 pkzvy63ewb operating current is 1.0 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 needed to reduce a primary vosx(20mm 8sbs zle/ 1:kia)dcjltage 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 anibm 8 j/ oe-4x9b h5(wrkj,lof a transformer causes 14 A to flow in the secondary. How many turns ankrh, x- j8i9lb/5 oja w4mbe(re 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 e.-v p*3: dwj hvtx p nxpm:;qa60aj/ymany turns are necessary in a 110-V primary if the 24-V secondary hapqjxydvaxv 0. :* aht-/;ne6pj3pm w:s 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 y*2g z qsbe(pj(kmyr6)dv .9,7fzyuga 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary ikubg(yvzzg,6 m9 27psj .rf()*y eydqs 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% efsjsw.: k. bvgl f0rf1y;qw)4cficiency, how ksc .l01w:q by );wvg.sr f4fjmany 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 transformer pr/e17f 2p1qq/p i.zhjigs 5vdz ovides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary draw?p1.qd qih/e5zf vz1ji p2g/s7

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer lc kh0gmiy +0q0v7sg/has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the gl0y q sk+ /i70chgvm0secondary?

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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 primao3rtbmeuwt j 62)p 3q;ry coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is pr 2 tpwe3b;o6mu3)q rtjesent 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. If dll jzj8f( 0+ithe input current at the primary is 100 A, we ca fjl(jl+z8 0din 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 transfcgj))n -;jv:w* novq;i0;)p m l ygmfjormer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the seconda )ivyc:mo;mljnw);g ) ;nj0pv j*gqf-ry 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 a* ljo9)a*wk9j rrs(nend its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power ou rj(n9l *w)aoej9kr*stput 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 currfo0wo e,w7 zq pf1vrle.+1 3tew3:j ddent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the nu3, ez 7epoq oev3f0d fw1wd:1t+r w.jlmber 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 120 V. The voltage is usually stepped ucn7bcqiml *;3p to 4500 V bycn b*c;mlq7 3i a transformer and transmitted through a power line of total resistance 1.0 W. Find 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 60 A of current at 120 V. Theos tuujon44an 3(0ny9 voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total re3u o44ut 9nonnasj (0ysistance 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 l- *h.daiuh0hw ine 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 with a turns ratio of 1a 0w -h.*ihdhu00:1. 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 kmbfcw:yw+9(.6 ecnq nl 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 transfc nylc:fe6 +bnwq 9.w(ormer 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 kes2fk7k+ 5ldn0x vb5 at 1000 V. How much less power would be lost if the power were transmittk+2x7k5kf 5edb snvl0 ed 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 generatorpk g2 r*c/ig. it:rb4o is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the ge c r go4:prt/gbii.2k*nerator 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 of 5.0 A. How much energy is storedz+ed 20lerfe0 in the coil's magnetic ffld re0e20+e zield?

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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. 74/g6bbbkysav xb5m 70-W resistor and an 18-H inductor. What is this circuit's time const56 ybbambxv7k4 b/7gsant?

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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 the rms voltage isoo ugzu5v). s5b11pjl 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 ingy *i 4-hmtre3to 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 place kbz4bi*sjb ,fe)b0i :d into a 120-V AC outlet. What is the resistance of the lamzkj sb)f:4 0bbi e,bi*p?

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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. Whatx7 mbkxq) 9gg8x1o 9zn is the peak current through the r71gbm8gxqz)x n 99k oxesistor?

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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 s:+;pu0gogdxnen fv*u5h rss,t-o; d5 upply. What is the power dissipated in the resisto;gre05-xs us5 *,do o+nnpfd:g; uh tvr?

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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 xdv8o x1qdwd*v)3 vn5.iyy y850-W resistor 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 50-W4gayd b53 cx9 9qiz:iw 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 2j4x-wuanya gx64i g/50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor9vjp ne/xz k78e 9v+ould; yq-3e- dxg 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 acxxbmb4:rs / .0ra,hit 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 1e2axhb 2ht2g )4.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necea;hj )1k+ag(rf jud-e ssary 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 120 V AC a1t 4ozxn69yr yfg:91odp-c l vt a frequency of 20 kHz is applied t9c9yo1y volzd4g xnf16tp :r-o 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 2.5-2aq2cw jl,est5 m1wngi/ +rw0-mH 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 c gw i6fzjaej us2ux801 (4cvd/apacitor 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 3/ez+lkr.ga v 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-m;l d djgs-wn4b, j eyo+8;i2uvyuv7a.F 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 capacitive reactansk,/h: i1/v j5 -j,mxuaafifice of a 0.010-mF capacitor be 100 W,1ahj :x/ iium,-ia/vfskjf 5?

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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 capacd )a 2tq fdi8c,l5rzp2itor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuib2 luk2f u2 rrry);k w0hn;6+a y1bomrt with 12.0 W resistance, 15.0 W inductive reyyu 2whr fk;; )rr+2nmk2bbroa 61l 0uactance, 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 1500 Hz if a 100-W resistor, 20-mH coi8c xe-ujky +f ;rem;;wl, and 1.0-mF er j;fue8;+- ckm;wx ycapacitor 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 1 at6nx tvz 9hqfafz1xm )4f5 +bm+ra7200-W resistor, 20-mH coil, and 1.0-mF capacitor )2mfvhmat61f57t4zxr b9qna x+fz a+are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, wh dy60hlad 2k4z.,v- vfjhzhx*at is the impedance at 1000 Hz?y, d v h-dx0k.2*flzhajh6v 4z

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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 resistorm a f1co-sp*/k is connected in series with a 20-mH inductor, what is the phase angle at 1000 Hofs1c k*a-pm/z?

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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 seria ,:pyexnkiqb -96 x. y(pujzs+o6;bwes circuit with a 20-mH coil and 1.0-mF capacitor for a total impedan u.eq,- (iwxppn yy+zs96a b; :6oxbkjce 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 sc/o r nsr.4d6with a 100-W resistor and 15-mH coil to d/rro 6cs4ns.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 fornfe)xp yquj0c(h 28;r a totx)r2 cu(jyq h8p nfe0;al impedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for a to+qyweq (td1x/7 1p4xac06 at emb-emetal imped+4at7q- mp0 1w by /ma1qe(c edx6etxeance 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 20-mF capaoh*yye/ c8n54- zuqqar*qy q ,citor. What is the impedance at 1000 H *8quyzey *4hqa,r 5 n-qcqyo/z?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needeyneq,xco(7 r9/ ),)csy jtq aud in series with a 10-mF capacitor at 1.0 kHz for a total impedance ,(7yu,ctcsr x))q jqae/9yonof 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF ca /w8-by v gu7aa)sn1ogpacitor at 1.0 kHz for a phase angle )wavsg-/y1o7a u gnb8of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for a tot-bqafkxr(.nd1iz +u 1al impedan .n-1q(1ifd+urx k zbace of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in se60spz + suh cyyd1xf11ries with a 100-mF capacitor at 120 Hz. What is the phazsy ds6 +1h0f1 yuc1xpse angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 hdisd32a cs2 qed clm.8( 35izHz if a 100-W resistor, 20-mH coil, and 1.0-mF z2de3c5a h8 i3(ciqms.ldsd 2capacitor 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 consnfq(wdcmqk o21 he v,,ftv(;:ists of a 100-W resistor, a 10.0-mF capacitor, and a 0.35(;w d,eqv t n,(ffmkqvhc:1o20-H inductor. The circuit is connected 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 reaev :l-dq2h7(gnpy /v sctance 30 W, and an inductor op 7d ( q/lhnves2gyv-:f inductive 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 series RLC circuith9y d- hk54iw e/e,0v*iaevx t containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductoehteexydh-kiv *a540/ 9iv,wr, 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 wo/v (rbxychlm,w1z :6 ith a 500-W resistor for a phase angle ofxw( 1h m,bc /y6lrz:ov $40^{\circ}$ 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 what freque8g 7wyd7 gq1./xfx jubncy should the circuit be drive/dwxggfu.j 7yx78 1qb n in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac sbhp*3n a.axh/eries circuit with 12.0 W resistance, 15.0 W inductive reactance, and 1/hx* np3a. bha0.0 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 anxl 9tuqg +losrx5y952 AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W.d.nut fik a46. What is the poai.. tnukf6d4 wer factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W res9 ed+c5:,yin1y fxjwnistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power sueyf n+,9dncy1: xjw 5ipply?

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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 coi /nsm03 ky n 8) sm5t;3kkygkbg8k9guxl in series? x3ug/k k8n8;tym gkkg)b msyn09k3 s5

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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 6ds:p5q: we0vo4 wwmoa resonant frequency of 10 kHz0: w:eo5 qdvowmpw46s?

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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 9fsz8 sf:up5uinductor for a resonant frequ u8fz :9us5psfency 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 be7z/ 0tx;dt 2e+dvv ket placed in series with a 30-W resistor and a 40-mH coil if the res7t2v /d;t0tdkve ex+zonant frequency of the circuit is to be 1000 Hz?

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