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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 magnetgu8rpio+4mb8 ,v4 d vhic 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 inducti h+w a.f2vb.hl2u .xinon 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 womxkr5j/65 vpd1m su/hat kind of change on th /1ksp/md r6xv5 5mouje 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 magnetic field txmy(i csvw7s1;lil ) ;hrough a loop of wire produces what kind of change on the il1 sv7cm;sii(w)xly;nduced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on the inwbu7(-akjv1b v alnh3g9 9 8jkduced9 vh-wgn7bla 8vkj1 9uk3bj(a $emf$, 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 fromy3wlz3rtibb ,u l.07b 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 l1qj 3pzr p-uk0bn y/q(aw, the direction of an induced current in a conductor will be that which tends to(ku1/ypj- q0rqzn b3p 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. A bar magnet is held v*2z1yfn u 9nkabove its center with its north pole pointing down. The stationary magnet inzyvf 9 u1k2n*nduces (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 tablau* h9pduu/l psej2 u /oh-- rfh/d+s)e. A bar magnet is held above its cent9*p)hur d/j -usdsa+h / phle-u2 /fuoer with its north pole pointing 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 rtm9zj. z iox-1egion where the magnetic field vector points straight up. Th.i-j1zoxtz9 m e 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 magnetvy (a-zvd)no) r:av4 sic field vector points )an(voys- v4:a )drvz straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where thp a nm,pwg3*4qh 7*fdre magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what r *,p43*7 nmdpfwhgaq 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 . ccf6dsm,/k qever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from abovec,f/.c m ksdq6, 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 p/ v* gc9dlnu.wire with the north pole entering first. As the north pole enters the wire, the induced current wil/vupd. n cl*9gl 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 constaw5;apc d yl+j4nt angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight dowap;y4d w 5+ljcn, 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 pa pss.vb6-n.(vhi zn zb2:v ;rotated at constant angular speed about an axis whose direction can pv.zv(a pbs2;-bisn6 .zh :vn 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 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.qyqacxb7z8 0n:h3q 7 p
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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 thf,*r;x ,c5ozsxn55 q ibxvnt0at an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. The ( u av,ju3j tm+ tj8z2e5ha1bb$emf$ 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-westn ci6bs c; fk1syyr (g,iz4vkd.h79g 6 direction) is moved northward at constant vel bcn1gyf6 .r(czi74s9gv6kysh i; dk,ocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a consta/n myg i g)j ;m-eapf)bc*v*:t9omjy+ nt 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 tmzp,r;e zv13aransforms

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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. The frequency of( l9vtv0 -ygby tlv(vtgy0-b y9he $emf$ 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 devicep697f bo2j/+r uwou82f bckt s 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 device t3,y g5 vkqvdh 4rj1ygfoo8 o23hat

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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 secondahup u 6 ou rgeoul-/d45i:,tp.ry coil contains more loops than the primary coi 5-:r iu,t.lo6p/ou4duh eupgl then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more looc5* wlqh d9vi5zk/7s;55gl h jjjzn;qps than the secondary coil then it is j7qqjk 5;5;/n w 9g5v jhdlzhs*5clzia

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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 :bu7 )f *pifqjpower 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 resonantte7nz8e: : zpyjyf 7t9 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 battery of z t t*pjnls7.vdw;5q,constant terminal voltage. At the moment contact is made with the battery, the voltage across the n7j*d.,ptlt;wv 5z qsresistor 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 an ideal batter9szcz m1m9b/ rl; im:ep ,j5vpy of constant terminal voltage. At the moment contact is made with the ba19 clmpvj i5 ezr,m9:p bszm;/ttery, 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 witino4n .b 2rknm( (*-used o2tvh 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 with indk+2criv i)b sh6d1di/ uctance 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. jd 6ky fs c43hkd1a(2m The time constant for the ci k dj14fy(akds62 hcm3rcuit 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 serierhlog wx)s7; /s to a battery. The battery is surxgw; /)o7slhddenly 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 followingl1z) ksd/y sk6 have the same 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. efs)hbn h*. )tOn 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 powmv qzb**u).h g/3fg qher supply. In this circuit, the currentvqmbu*hf3 )h*gq /z g.

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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 ad4er i9t7sk x0pmfm*:c circuit changes by what factor when the frequency s4trmdp7fkmi :0 *xe9is 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 in1nx( 8ei/qu pr1nk.b/*) xi lqcsq)qyductive reactq/q 8ub*prsk) n1n .qqcelx (x )ii/y1ance 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 volt5wc1jv oj50nk age across an inductor approaches zero, the inductive reactance of that cooj5wj51nvk0 cil

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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 ot11 ( fbx ;q.ndzlf9jpower supply. In this circuit, the currentz 1od 9ffnq.bl(j;xt1

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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 acet oa*ysm5 w0hqv6cx)xx7)2 g circuit changes by what factor when the frequent0eash7xmx*5q6 2g yco)x) wvcy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor app5 msnn*)sc fo;1 /*gp ihmq-tjroaches zero, the capacitive react fisn)*om*pt;sqmg1 c- nh/5j ance 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 jj4t)bz1 xvyw0,z hw 7x tdl4/the inductor and capacitor in a RLC series ci 0,j4db) zvzx xt1wj 4hywt/l7rcuit?

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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 RLdursxp4 ztd - hd9xo408 vxm(l00:wnfC 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 circt;2i y poq+wq9 fvt8h (tb so5i55rkz;uit. The impedance of the circuit increases if R increases. When is tz5;tbokqv59ohp2q8 + it;rtwf5 (i ys his 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. ock9b/ )5m,/ * q4 +hph( pmhhsaviqcksk6-hbThe impedance 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 circ cf omh/k( 0dk:l2ho 5-ojg6uyuit 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 capacxp3q6 a -uq,pr nq0v/hqwef xw0(y6t(itance both double in an LRC series circuit, the eq0q-w xpnh6apqx/uvrw (6yf ,q30t (resonant 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 b.a) zv0 (vwyilkm+k 9d ln7mr7y an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC:04 l(i r rfj:twz+bda 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 0.10 m is rotating in a uniform magndt g.28q* u.og1ast0 cqvvvd* etic field of 0.20 T. Find the magnetic flux through the 80*tao* gv2 1t..gdusq cvdvqloop 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 radius ppie lf.7 :(ax0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of thp l:xfae7p.i( e 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 unifor,hniyn 9axa2(m magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field ve,ny2x(haian9 ctor 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 adjus f0tl2msj *+y jxce1z ..n4oultable 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 change7;g ac)( uxwanoxx9 3rs from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 9co3x6 6kth hy v)4g2fa,wktocm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniforkya9 x ,)v 2wft 6c3othoh6kg4mly 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 15 t)zzm87h;xje/ 1j vv/cy g 9 tzrhzj9n2urns 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 b0ciq 6(m66ztfl9kwu 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 w5*ak-fncbs q; ing span of 60 m flies horizontally at a location where the downward component of the Earth's magnetf;b*csan- kq 5ic 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 26g) hzk kl i);o(/3cbs4ogp8pv f(jkv.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fiel3)lc 4phovkv6fpoibgz( k g )/;s(8jk d 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 cro6w-:g m3ts vtdss-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of -hrsq( r b74bp1 r65ljj drjl: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 f+ ;m(+0lb pu1konmdfloop 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 rotatk+l fom1;f0 +umdpn(bion, 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 consis t.uul tz chcpv2i743;ts 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 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 o8me y(jauv5 v1utput of 12 V maximum when rotyeum5j8 ( vv1aated 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 mnt7l6*bm7 cw jaximum $emf$ 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 operatesf1juv625 o tfxm5 lxd- ,yxov3 on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W.9 ev7d vu)pff8 The motor operates on 120 V AC, and when running at full sp7dv v9eff)p8u eed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-rf 4 tbwcio.r (:q r;:y:fd m+o;ennv9V power supply. The operating current is 1.0 A.tr (4m:n v;ewy 9diqr+:: fcfbo ron;. 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 ehli 3f; -mflt)wg5u,9uad6 o is connected to a 24-V power supply. The operatiwfm; h,lfau35iotg 6 ud -)9leng 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 iskk74 vkvz6j. w connected to a 24-V power supply. The operating current is 1.0 A at full speed. Wha z kkvvj.7w6k4t 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 neei e wcvxozx*4c7wk0;(ded to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causfeo, t6+ *pa y;vamuq6es 14 A to flow in the secondary. ;atvu pe6mf,q*+ ayo6How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if the (zdhr6 pw 2c0+ krydw tch .tr6 7m,6fn6mua:i24-V secondary has 100 turp7w yrrc: 6m+kt6 atdfuhc2 6. 6 0zdm(h,winrns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn second/u/ :3eq5kyvra ,,;qi xqnhpm ary coil. If the current in the secondary is :h/3/n,pakiq xvye 5q,qru ;m3.0 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 1g0cxt2z d kfe3otram(5h7 li .1yh -8f00% efficiency, how many amps athig ta-d2 h3xm( 1l 05 .eykfc7rofzt8 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 provideszo2 7xg xk4qy.6(ngsn 7500 V at 10.0 mA. The primary coil operates on 120 V. What doe2ok.x g4qsgzn nyx7(6s 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 p86fk (7mwwxw his z(b0rimary coil and 300 turns on its secondary coil. If 120 wwx 6(fi s(z80k whmb7V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its sec, ui m8qgta.n+xs0e f7ondary coil. If 120 V at 2.0 A is applied to the primary, what current is p7 gqs. 8exf0umtia +n,resent 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 21by45xar yh ;f-bjz0h00 turns. If the input current at thybryzh a41x -0f5hb; je 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 turns and its secondaryn(*sd: bc7pm* dt3tl(xxp mih: sw(s : has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to bs(c:pm (7db(*m nl3xttxp i:sdh*s:we

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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 turns2 rsb.o9a:4zfq:tdd h and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power ::ht9 da2.fqrdsboz 4 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 is usually stepped f/, rdzvb 1w g3dup dy11i()*zwpad4eup to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondardi a* )3udrzw d4efg/w,11zpbp ( y1vdy 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. T3q) 4cw fbzns+he voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resisc 3)n+bfszw4q tance 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. The n90ov xkb, a,yvoltage is usually stepped up to 4500 V by a transformer and transmitted , xn09yaokb,v through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a totaler6ug32 bw q 2mx*02u0plq npd resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heatin0mu3xruqg 0d w 622p ln2b*qpeg of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not 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 h2( nbf,zykjwa)(it- vm )2h hqas 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, (nht-q) bakwmyj fv2i,) (2zhthe voltage is 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 less power w+d 8bdjagszuik*p4 nzn0l.)nt7ginxk28f :, ould be lost if the power were transmitted 4 b df8pzk7ta g8 :znkun2.nxsj n*+0 i),glidat 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 26fa z0/;ukathq+u8yd n)a x y10 A. It is to be transmitted on a line with rutha0 ;kd) y+u n6ay8/qfaxz1esistance 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 stored in the co3+3 r( qne0ir hnodbq9bb63bdil's magnetic fie+3nbb 9rdo30h dqq b3er(6inbld?

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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.b29(bzpp (rubhw6k 5n3l bvn 18-H inductor. What is this circuit's time c p(v n5b3bz 6puh 2b.rn(lkb9wonstant?

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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 *s 2, i edf95-ferexaain an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak curtd9ub),8t 5fkk-h ev h kk,ti1rent?

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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. Wha+ (plb,y rm)/5qewmz jt is the resistance of the lammyrw b5l (q )e/m,+pjzp?

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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 connexa.d3rn 7wrd 8ec19 lncted to a 120-V ac power supply. What is the peak current through n 8dr1.x7n9ald3wecrthe 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 connectedt)us6jju0 j8y hz0sc4 qv*5du to a 120-V ac power supply. What is the power dissipated in the re tv5h )6suu0cjz4*dj 80ysqujsistor?

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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 o .pua:;q;h+j 6jor(sm n)tp2 ,ssotsresistor 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 5np.9cjl *tb; x0-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 50d /eudk 8s02bi65wmfj-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 indge, n 8-.5nz jykthk9bkkf6q; uctor 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 reactatk 8 fh1r-td7uiq40cgnce 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 retw,(:et j)fxy actance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is nece*4iw g2i;2mxe*qquw cm1h51 n 7itlx mssary 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 6 9yb+ gvrv+k0) 8aw.w ykcbk2pocj.l60-mH inductor when 120 V AC at a frequency of 20 kHz is applied br vv0.8k6pyc2 k9 l o+aywjb)c.w+kg to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Ho:(fm1)vrj( 8dnf+ .0oocussez (z xwz 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 cai3zz smq8e(q2 pacitor 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 d rq*u3- y6z8gz/ojoc 8k(nvuof capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacito32:6vwhxq /kfndn( per 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 prqiwt py,af*eu;,) h x/v-y*of a 0.010-mF capacitor be 100 W?e*w /,)y ah*txirpu-pf ;qv,y

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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 anbn h+ji 4 png*djck 9s6h/4g4cg3 febfo/62nk d 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 12.0 W resistance, 15.0 W - ebmknqokf ( (gz*f qy,v)p:/ub:2gc inductive reactance, aonck:/ qm : veq,gz( upk-fybgb *)2f(nd 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 18c:ylf:fgs)cz5prdq. 5m y1 i 500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capa5m) crpyglsyi8f cfz1: d q5:.citor 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 vdun v m-r yglb)3+tlht+x 7-;n 93thc1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in ser th tnyv3xru-cm9hdv;+g7l )lbtn3+ -ies?

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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 withv9ecib on/(e + a 20-mH inductor, what is the imp vnci/e+o(eb 9edance 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 connected in series with a 20-mH inductor, what is txur1 r k j0w7y t2ibkv;86l4uvhe phase angle at 10jrk wrub2 6xil0v;4ut7y81v k 00 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 anmv /i3gc;zrehq en68+d 1.0-mF capacitor for a total impz;/6h evcig+mn3req 8edance 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 with a 100-W bcr d4 c*-tqf (jza8c/resistor and 15-mH coil t 4t/8 ab -cdqf*(rcjzco 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 4 41t1 dvl.ixu26ko:dzn qt)sq50-mH inductor at 5000 Hz for a to.qqoxi:vld16nk)24 z1 t utds tal 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 1-:vn 6 adh4idv dfc)u.00-kW resistor at 1.0-MHz for a tothcf 6)av nid :4v-d.udal impedance 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 in53jlflq )+c9bvwa ix xi.4y fp8zsh (6 series with a 20-mF capacitor. What is the impeda+cjqf )4fi 3 ib5 lzwh6xys9l.x(vap8 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 a 10-mqsm- *m3 n. 8hz4c( wuumzf:pjF capacitor at 1.0 kHz for a total impedance owm-.n *h(j4u 8pzfm m:3uqzcsf 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 10-7;q+hir0;gjq r+i j0o reym :mmF capacitor at 1.0 kHz for a phase angle rqr0 i:gy+iomjqhrem7; +j;0of $40^{\circ}$?

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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 a zs tqe;alfc0vaq65.; t 1.0 kHz for a total impedance of 45 W?6l ctqzaaq;.fv;0s e5

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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 ir9dqa2z: jr 701 *ik0 frhmqron series with a 100-mF capacitor at 120 Hz. What is the phase * rr 91 jmdioqrr0aqk0:fzh7 2angle?

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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 q7at+evnn6a,bnq 0-f and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in7n, 0net n 6a-qqvabf+ 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 nf3mu459ndp c7- nysv)6z cuza 100-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. What is the rms currentndp-7)9nynfzu3umz v c 54c s6 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, ai *1u/:frgn 4 lhjm-e 8cho:rm capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz phho1el c*f4 :m r-mu/n :8jrgiower 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 foi t/svoz ;q9q-r7 ibqop(/7bn r a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, w 9 /r7otbsq;pqz- (niqobv 7i/hen connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phasz.* rwv-+ xhnwju7vl)*m s8)d0vkwmme angle orv0mx+ vm*zwh )-*wmsw.v)lju7 8kndf $40^{\circ}$ 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 = 10.0uejtu ;3ixts8b( w8 ov g-feb.83q0 ih mF. At what frequency should the circuit be driven in order to have maximxtj i ie.0bt3;uesbf8h8uq(-ow3v 8gum 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 outpu ifi0vrf)a.clc-03 vnt in an ac series circuit with 12.0 W resistance, 15.0 W inductive ren3i a -.r)f0v vlifcc0actance, 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 circua i(2takm 3szrl pb9jx*8)vl3it 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 on/rbwt)(-jwk kj bv8)f 30 W. What is t j-n)kw8kv (br)bt/j whe power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circs9g 0+ixsz wowh77l0quit containing a 50-W resistor, a 10-mF ziq0sghx 0l sow79w7+capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0j+d.8if mgoowwwh 2gpg 027m--mF capacitor and a 15-mH coil in series?20hdof.w2w-mom87gig p w gj+

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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)dhdq5 dc*2r)wmr k-n for a resonant frequency of 10 kHhd*d cw- 5nmqd2k)rr) z?

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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 re1vy9/5m 4 gzs/bt lrvwsonant frequency of 100trl9wvzb5/s m4v g/y10 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 a 40-mHnwwc i(x0 z1x/jq*/j o,eqlx+ coil if the resonant frequency of the circuit is to be 10/x 0(*1i/ o,q wlq+njjzcexxw 00 Hz?

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