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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 magneticel6qf/s ) vw)c flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that the mw 0l1;tuws9e $emf$ 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 wi 9nt np3pn-:kfpg(4ce 49qdll re in a coil produces what kind of change on thend4l ppn lg9 cn-q34: 9fetk(p induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetics0as8 i1 :pbzs field through a loop of wire produces what kind of1i bsz8as s:p0 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 nk)bwo3 gq-xygx68 v8a loop of wire produces what kind of change on the indu6bxgk)3ywox 8ngq-8vced $emf$, 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 frbh(sqf 52ip(h ci25 i rmh4a0ydu+5 zsom 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 directionvabtxp+. r/ 3g of an induced current in a conductor will be that wh b rtg.+xvap/3ich tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. Aa 5fbufr hb)s0t1z4s: bar magnet is held above its center with its north poleuhztasfsb051 r )b 4f: 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 tabja)thmu 4m7 2lf/+ plyle. A bar magnet is held above its center with its north pole pointing lj27ht) m4f+lmy/aup down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a re.+x 08katrf9iwe hkt m xg4b1.gion where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the ta+k r mie .hxfx4wtb90g1k 8.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 i:eqjrh x.n41 in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as th:xrhnq.i e14je field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where 0 5ur -u1ayapithe magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction o iaupa5 1-0ruyf 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 andie 4j +sfy(fn4 carries an ever-increasing current northward. Two coils of wire lie flat on the table, one 4eyj+f sn(fi4 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 0p0 cyhyeh0-rzd -m (qe:ckr5a loop of wire with the north pole entering first. As them-y 0pc ce:ry-hzer5 kq( d0h0 north pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis q xe4 :s6pq,6(g llddbwhose direction can be varied. In a re lsb(xqp de6:ld q4,g6gion where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angh)sz1 ;dw hjf5ular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation o5j1hhfdsz ;w)f 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.w3x)qul qai66 vk28cm
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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 m 831afp /drac$emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic f, dy-jt392kxl z*lxng ield. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northward at cpqi4h 0jbqx/-ai je. vs7vw,1hm g8 )honstant velocity through a magnetic field that points straight down. Make a statement cav7h i ixqj0. h -mjgb4pw8vqe 1),/hsoncerning 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 l+28yh4-n bm x,rfrica 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 9+we) glh e9ngulppxn0nq- 8jrm .* f(xy .ku/transforms

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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. Thlz2jhd4ck7,-*si v1; osx9xd )kmeh j e frequency of tx1ieho,j 2 z4 v9xcjh-s7m; *)dkds lkhe $emf$ 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 devi rdiuxy8o ttoh/ e;wx9opxs37 9;d6+s ce 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 d. okhn v.ac31a8w*hq-f/ n uiievice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than bhf)h1b997k4 gtnk qt the primary coil then it i1kkg9fnhq4t bh)7 tb9s 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 secondary cyu n,nt e 2joyqkb857:oil then iteq ny u2ynjtb58,o7: k 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 z r*0u awet;tbh +ta8* 6or8s;e.pakcpower 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 circuitl,1. t;x7rhzmwd*h he,

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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 .twz+7 g)ezv aare connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistor i)ze gz.7 twv+as

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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 inducto/jjt;j 2vqf uv,f )fekk,a -ga9 20mbor are connected in series to an ideal battery of constant terminal voltage.a2ff -;ef0t mjgojk/uqbkjv,2 ) 9a,v At the moment 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 resistance R q wk.qww 83.+ rw. 6i+gcsejtbis 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 inductance L any0 :t+g h7thjod 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 w7t903g rb 3 skoklm4cseries to a battery. The time constant for the circuit represents the time required f3lw4k7ksbo3 mcrt 9g0 or 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 inductoe to 8f.0r8:cdbunt.vr are connected in series to a battery. The battery is tfdnr .t08cv8:.e bou suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same+byb.,(aamvgkz 4-q7+u tqyc units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the cur) zeumf4iu 1,3ter(ydrent

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the curmb bf:lo2(2 .k3ecxce rent2lx2:e fok.cbem3c b(

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactanceb cbda oog 2j1.**pvat9wg* jww -n7xc .tzr;) in an ac circuit changes by what factor when the frequency isvog*jagort9c7.*;b-* wanz wxbctwj1 2p.d) 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 1snb *k,uzt(pyjse2* inductive reactance of that inducsu,** j(pbnte1ksz y2tor

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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+6j y1 1hudujt AC voltage across an inductor approaches zero, the inductive reactance of that c jh1juuy+ t1d6oil

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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 Ald ,b ; atq2rgmv.55niC power supply. In this circuit, the current;5q .tai r5nlbm,g2dv

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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 changes by w- 0zl) cywlor)hat factor when the frequency is tz -l)) ly0wcroripled?

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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 3 q)yyuvw3 l/1eymu2pthe AC voltage across a capacitor approaches zero, the capacitive ey33vy /u2qwum lyp)1 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 indu fj-mh7kyrse1gin:6 7 ctor and capacitor in a RLC s17grje:y6f -7ks ni mheries 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 RLC circuit is defilk5/khluo9qvg; t n60ahag8* c7 gw s4ned 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 incrp 0yuik, vrh 5+/b:ten -ttzy.eases if R increases. Whtr0y -n.tb+hvkp/iyt,5eu: z en is this 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 imped,o 7k *mhmti 0mk,lus1lj2 me,ance 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 eg 2ihj2o) 5(8ycycge 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 kluc3r-4as, vseries circuit, the resonan,acsrv3-k 4ult 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 voltage. At resonance,21q bm6p ta*gfg 1f1il

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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 occurs whegv 72r p5l;rkb uc-t3kn

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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 rotating1a1u xojp;)hs in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when xs1;aou)1jh p 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 radius 0.10 m is rotating in a uniform magneti2uz.8 uqe8m .9 n(r rb:qazpzuc field of 0.20 T. Find the mar8 mra peq9ubqu:2. u.n8z(zzgnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magm91q,hwr k 7cb,;up(51. i f7 xo/aodvxwrct enetic field of 0.20 1b(x9vq1f7 hri, w pd.;/ er,xcm o5o 7akwtucT. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjuste a +dz+7ya5xrable 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 changes from s6kt0i9g fv )icl7cr*$4.0 \times 10^{-5} \; Wb$ 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 jpd /74wozl/hof 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 uniformly from 0.50 T to 0 in 8.0 s, find the average o/plhj4w/d z 7value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an ar.ao-vsoc(m; /xn.ih rea 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 m/+76zu 62w5enofg ld*zaqrv area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location whn052c,bjzv;bnp cex4ere the downward comczcb0 vn5npe; ,j 2xb4ponent 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 constant 9ol5grq a+puo ye najm,)owp7 5z1./eangular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a cons)5z puoo. +9magqy1/ow7,e ln jar5 petant 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 hamwq ugs :;4w /8a wf oyjg5 i9dw4gx.vidx)0w5s 50 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 consnrb;74zkq6 r8wby2py ists of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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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 r. bqmj36k:z).t brw19cf)ypdf,l i ag ectangular 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 ac if,q1r wm:)36 dg ..9pbbykzjtl f)uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists ov9+-4ns,xk1v dx mvzoz2ipc8 ns), rc f 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 of 1fun8l*q2sca *74rzu b 2 V ma7n 8bczrus2qa4**lf u ximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maximum la2;qokb g03rxy*n8- -s *q wb0bpqmx$emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operateski/xg- -r s6rm/0xdzj 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 res1 c)m*ndd ans8 4v*.pavurq )f o:s+jcistance of 6.00 W. The motor operates on 120 V AC,d) )1+un*ndp4 s qr av mfas:8*coj.cv and when running 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 resistancye4 o7,ly9 kcp m8/ze (gfn3qpr3qv5ue 6.0 W is connected to a 24-V power supply. The o987p/ m3ue4rzyqv,f (3 yclnpqge k5operating current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0z3 ong5 m7,b1jy9c)n ci-nexwn dq,,k W is connected to a 24-V power supply. The operating current is 1.0 ,i,dcy7-1nwm 5k jqng zo,9 n)3necxbA 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 iu 2;g4.z ;qath3o.flv 4jk ltizd-4yto a 24-V power supply. The it ; lkd4zov4.3.zg lq iayuf-4;h2tjoperating 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 transformervze/:2ldz *u nt3 oxe( is needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn wbyqeb4mg ea-8 g6u(3primary of a transformer causes 14 A to flow in the secondary. How many turns are in the sec(bbye-8g qw4mu 63geaondary?

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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-Vsi4ig6- f2vc7d(0zpi fvww2 y secondaryv274z iv- g c2yf0fpi(iww6 ds 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 5003b;rkc-3n j /bn8bqau -turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the3b 3;b cj/kuq8a-nnrb 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% h7 rk 3gzp ; cbsr25lol)..oppefficiency, how many amps at 24 V can fl3g2po kpr l).p.h o7bzlr s;5cow 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 provm i/9tuvh7aunv2 x4r :9rj5o xides 7500 V at 10.0 mA. The primary c9vi9n rxuh2 u r/v5tj47oam:xoil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil an-au:cveo1 gf;lvw 3dk4el+o, d 300 turns on its secondary coil. If 120 V at 2.0 A is avdu+l14;g ,oc fk oe:-3awvel pplied 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 prim /i mk xzn8nv/4vid4.mary coil and 300 turns on its secondary coil. If 120 V at 2i/nv 8mzx 4idk/. vmn4.0 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 hy 9kys- 8ax,h0bdn0amas 100 turns and its secondary has 200 turns. If the input current at th9m0 0xays- , dby8nkahe 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 transformer has 100 turn7-feavm, z.r tn5;f nis and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output vo.at z,-fnime5 nr7;f vltage 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 200 turns. If x2hdx (2 av*c4lvprbzg1;dv .hm2mv*the 2x(vbmvhcr*d. gpd1hm*v ;2zavx2l4 power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage i; ccs,f.r9b3ynf6-qd2g0)fp k nl zay s usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the numbeskb z.l-y9,0; f 3g dpn6fq2 )accrfnyr 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/cwvc)g6.fy m 60 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 resistance 1.0 W. cw6 g.yfvm/c ) 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. The voltaam m(/nu*oabd/ ii q3 lpj//8oge is usually stepped up to 4500 V by a transformer and transmitted through a power lim(dpi noqlaoj/ b/i3a/u8m /*ne of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 g6yyub+l 3po* cwlzq*k-q x. -W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transfo6-lu z q *wqy*cyp.okb-lg3x+rmer 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 lilbcx8 88k.ny +s)7rzupfqu)fne 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+fqnscu8pzy urb.x87f ) lk8) stepped 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 1000 V. How much lesxpm8 8 xllt5 /kvj1)wes power would be lost if the power were tran8llt5)x8 /xj w empvk1smitted 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 ise;huo0dy u(u7 440 V at 20 A. It is to be transmitted on a line with y d;0hueu uo(7resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is storecp p4z)s: dp1bd in the coil'cpsz bp14dp:)s magnetic 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 re(1o.+ vuni+,hqgn(f qi 1edzhsistor and an 18-H inductor. What is thi( h.ov d ze1in1qhf nu+,(qg+is circuit'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 the rms voltage e;2j(bt jd5bt is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is theks;hk 9.30(iclht sj 1ix9hcga6 2bfs 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-Vim p+ r:2ngu)t AC outlet. What is the resistance of the la :pugm+ tn2r)imp?

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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 powervsx0 2r 4.n:khs79+volf a lei supply. What is the peak current through t 0k :i.evsfn vhs+2 97alo4xrlhe 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 txbq ;lh u5np8p1fh lf9z(z;)eo a 120-V ac power supply. What is the power dissipated in th n8x1b)lzeuf h;h9; z5lqp(pf e 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 502ko0z *qmksb97c tbtxcr1+ xp0 x u0 -up;lux6-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 50aavnq*1 0w; opbi-y/ s-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W res(z4v aj.-rr 3 *qpdlqeistor 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 ofd.ah vvi n*n6k29x k3k8l n:pa a 1.0-mH inductor 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 er0 +/z+z:4lo,i s nwfkj:pobreactance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive risw jiy1f*7n +m 9hz;ceactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance3m0rjhebv3z6jik jk0e( k a*. 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 1g bs,)xtm-ry 920 V AC at a frequency of 20 kHz is applied9m gb,-rtx)ys to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current thro)2vi2w(j3jerw k ygc -ugh a 2.50-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 reacu xi6oi i)doha y+ji5-c)1kn2tance 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 syxj3 6vrr6.ji0lauz0 bg6 ;r reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capdys 7(q ,9ozeo6xnt6:jgr ,tqacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0 pt8ld j4*fikho-/j )zc h/cp27pm 0ld 4s3ylm.010-mF capacitor be 100 Wl4 //s 7fol3ic4l td8*hc0jmh -ppm) pd2kjzy?

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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 1000xaxr8s;zfhkb 7,n,dn f. n8, ,usesg1 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 circuit with 12n7h/yg2fp1b( pdolv ).0 W resistance, 15.0 W inductive reac ygf 2o1phd7 np/)bv(ltance, 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 15ltr*4b 0wq 5nn00 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in s tln05r q*b4nweries?

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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, lvy bky**35c57hrryq and 1.0-mF crbhk 7lyc *5y*3q5vyrapacitor 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, what eiq1n ,f8s;t2x9 kl zuis the impedanceqxizn18e9 fl st,k 2;u at 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 :kaa v7+ s(s*sl2k+i; hpup)kt r,kevconnected in series with a 20-mH inductor, what is the phase angle at 1000 7hrils2(s,v; ++t*vaukkskp ep)a k: Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mxossha khn5 ikg3::+.F capacitor for a total impedance of 100 W at 1500hxshs: ai k5ogn. +3k: 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 wit79x 64dr 4jsy lmnv9uzh a 100-W resistor and 15-mH coil to get a to9 r4nd 9jxml7vyus6z4 tal 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 series2 (/ vnzpkmx*tu vm ;l,vwe7t kj3v5d* with a 450-mH inductor at 5000 Hz for a total impedance of 40000 Wvx v m k27j3vt;l* duk5,w*mv(pen/tz?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must i+z uk/wud:wzj4 w 4:abe put in series with a 100-kW resistor at 1.0-MHz for a total impedance ou4jid :4kwzaz /w+: wuf 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 wit ;h4-ekdl2hd7 w cbss3zc l3gh2a:eg3h a 20-mF capacitor. What is the impedance at 100043lgce;c d 22 g3sbzk3 d-s:hhwehl7a 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 wi /i+d*)dtx xllth a 10-mF capacitor at 1.0 kHz for a total impedance od+lldx*i t )/xf 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 neededcs ;8y 4aix436hmhwjy in series with a 10-mF capacitor at 1.0 kHz for a phase angle o8cawh;hy ijxs m6 y434f $40^{\circ}$?

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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 kef3kfi 4i6 c3 tqk3q:uHz for a total impedance u3kfi tiqf4: k q3e36cof 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 jhhn71reb6 b: lj h6m4100-mF capacitor at 120 Hz. What is the phase angle4:lnmhbr6 j jhe76bh1?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, t 2dtfktk;l ufh8/r6 ;and 1.0-mF capacitor are connected in serie;;htt2/ k ktlrfdf68us?

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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 aoin6f jblk 4 z.mr((nsh932u100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. W(m. sh(u nainf2 bo43kr zl69jhat is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an inr l9c1vvg ,w+gductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power sourg,wcgvr+l1v 9ce. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resis-a3nncfdnu 7+0 vz ke/tor, a 10-mF capacitor, and a 0.45-H inductor, when connecuf-na+dz73 nvnc ke0 /ted 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 p9x+h,l f0m;5)mz a nu ,o+sj aoq5afowhase angle of 5+ as qz,o,j oa9h ol5+fmx;w )nmuaf0$40^{\circ}$ 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 h5m ljr3mzj.*3g-dm vx q k4 p4m3d*erdas R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the dri. v4l*5jr3mx4ddkj p*m3-g3 e rdqmmzving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15e o21nskmqn5 xq;me h(1s2+lzu ui65q.0 W inductive react+q(1s2 n 52xs1nem huqeq zuliom5k;6ance, 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 is gdmj9,*ko2azpd) w+p4z vb 3n5r xa d7$63^{\circ}$. 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 av. y6mbtlsqc84sq 4(h n impedance of 60 W and a resistance of 30 W. What is the power fah4mq( . ssb8vq ctl64yctor?

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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 tp,kd 0eyo**u4 i yc.pa 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz powery*uey pp,o0k.i d c4t* supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-gyz y7zj r krp4d :-./w:b1yymmH coil in series?w pbr/zkyyz 1 y:myj-7.4 g:dr

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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 capacito 7:k/vv4 yqkdhr for a resonant frequency of 10 kk hk: dv7q4vy/Hz?

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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 resonanq9i rdy+oazx;(t* n cre:9h.6z *m wyst frequ*.esyyx 9 (*r:iq96dt +wzz o;ramch nency 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 resistor and z mu / uw37ma3jlx(g:ua 40-mH coil if the resonant frequency of the circuit is tzm m3auwjl7u: 3/xu g(o be 1000 Hz?

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