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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 unitze-/qe2 tn(4xufuhr+ x : zmz:s 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 inductiy ty:z;r q0h8,fu8nkb)3nu p+b9oleo on 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 cog2ceeu xqt * l+/h,,fqil produces what kind of change on the induced thq, *qc, l g+2exfu/e$emf$, 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 a83t2wxvos (s0hu/y t of the magnetic field through a loop of wire produces what kind of change on the yh2xos0s8ta ( tvuw/ 3induced $emf$, 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 prod1qtrohj 3nixc/4d1ut6m2wp mz .9wg0 uces what kind of change on the indu 2o/4ch m 1un zq9 wpidgw61trtx3j0.mced $emf$, 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 naod5et bvd8sv6i9v lh8.* + fan $emf$ 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 inducldn(n2 9cg yy-qx u)+oed current in a conductor will be that wh-glo+ 2qc9dx n) (uyynich 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. A ,.e-spdj0 x txbar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from above exsxtp, j-.d0)

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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 horizonnvrvfi t*on7u)7 n1u- bp 5zy6tal table. A bar magnet is held above its center with ivy)-5 nuz1p rn7 *7buovi6tnf ts 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 region where apdq250xifig4m 7y- fw7ply/yb5le(the magnetic field vector points straight up. The magnetic field vanishef by wfai-2 54 lp7p7(50eimyg/qxly ds 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 levelolcjrq4*0zf ;7loa k ) table top 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 a *z4c0jflor 7qk;)olin 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 the magnetic f: 32q+jm fcfopield points straight down. The 2f3f pcj :o+mqmagnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-incresd+p3)kl , zbuasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the )d,lbuksp3 z+induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering first. xa:rd xd lhsh ;(:5lah:w k7ye0lh+q0 As the north pole enters the wire, the5 a; (dy :x:akq7hxwlhls0r+:d 0hleh 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 speeweh6x4zp : 4igd about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must w6zgepx44 h:i 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 angular spem7lo e fq:3f8oed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced moqloe 7 38f:f$emf$ 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.qa*myep5/ kncmq exjxp) f8*y)co/0-
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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 tv9lwu- l3gtxc qu w;inz+l2,. ci;t2$emf$ 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 field70 pp4 1jg9vfxel n23ywf-hlt. 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 no3o7 e(ikge r; 7wisuw8rthward at constant velocity through a magnetic field that points straight down. Make a st77e(;s8oiw guierk 3w atement 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 atl firtu8x8pp 1u56pfl7d)yu / a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator traumf0wcjlj,c0el ,mg. ;6jwf j035 x lansforms

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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 eacu3xt2 *5v;7uwgi mz iso 3:qqsh second. The frequency of the:3g 7o2wu*szqi 5vu3sq;tmix $emf$ 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 devicenw 9x .y*gt (e:q0qhzax4w2ax 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 deviceg .y9:/qbg5)-fp *cs z jkpgxj 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 moj m zd2t61cpi0re loops than the primary coil then it is ajpcz 0mtd61 i2

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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 loopscg 0q xnf6c-3oiif,v/)ey- jy than the secondary coilgj6efio -in3 , /vxyc0 c-)qfy then 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 p3v q7izqrt/ t7ower 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 resonan m:8g+xh,2odop.a jca)/ wbict 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 sereez t0t,hi233b gn1 l)9 yl*nzthpku5ies to an ideal battery of constant terminal voltage. At the moment contact is made with the battery5 ynni2hpe3t3lh0k1lz zt9ue *g),t b, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ij coiv6c ppa1 hf)k; 1x+ pumefam6)z5y6yy)8 deal battery of constant z 66y+puao)1ve y1 h)p5mfxcac)8p mi;6yk fjterminal voltage. 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 re f8x*-k (x 8n9ltzntblsistance 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 inductagb75n 4qc1xzqnce 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 battet .n4 +l3)qr:qlujvyk u)k-szry. The time constant for the circuit represents the time required for the current to reac:js +3nl-r4ku.qkvy lzu)t) q h

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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 agkgtfm mgk 1b 2vr 1)jk/p2jk(r:bn 27 battery. The battery is suddenl/pb2j :gkvj1g k(2mn bm f7)k1gr2 krty 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 hav ;j+hnj kelrnu46pid+s2z9 *cs*e+ vue 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 akpzhq;v1f );jn AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power sd j2b1m gcg(-3.fur (eor5fsbet7vm-v - +hssupply. In this circuit, the currenv-3(rv-f5ht scg2b+eg j 1 7fmsdso rbe(-.um t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when thebf9j gk gz7(2usd *s+y frequency isjs+fz( 2g7s*b gyd9ku 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 ts 4db6x(4ft, qvik7vnaz)qyzp/ )hz(he AC voltage across an inductor is doubled, the inductive reactan,z v sqxv bzt6f7()kqha)(4z/4idnyp ce 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 acr,07 y7x +biz wm 9ly7frpeiam(oss an inductor approaches zero, the inducti iyp(er9iy7z0 fl7amw+x m7b, ve reactance 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 por i(k1x)oueqnl ;y kq86 o08ck;scn*qwer supply. In this circuit, the currentsnq8 lcro)uixnkoky1q8(6* eq k;c;0

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reacta+qc7 gr q+iadu2c60wd nce in an ac circuit changes by what factor when the frequency7q26 d+uwc agridc+ 0q 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 capaciocgz8lx6ehns af*k(i 7+n y6)ka t/0etor approaches zero, the capacitive reactancsaz n(t7fclx+e*0 68gkiae 6o/nh )yke of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor in a na3ys b8d prfer/ e1,,RLC e,r,by 3/ 8ra fes1npdseries 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 dha mmyl6f7zt g,- dd/ z7j8)vzefined 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 increases if R increasly* 3xl9box 6ses. When is this statemen* 9b3s6yxx ollt 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 circuitb. *phvkwq 96g. The 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 circu0dg*est+i0e rit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuit, the b+w,rwlp 0q r*resonant frequency of that circubrr*, w+lpwq0 it 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 voltagiegfg78 wd :m(e. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs when(qfny+53 yq iv 8nbkw)

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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 rotac grk379vvd v1 rg1 pdd+4eff.ting in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loodgk rgr11pcv9df.3ve4 +d v7f p 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 unif,*bptb 1c9r4w uu6ke2mc82ka/j d eay orm magnetic field of 0.20 T. Find the magnetic flux through the loop/cb,2pkum8a4wk ycee96ajbu 2t*dr1 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 fxj 6byk s8qp)/ield of 0.20 T. Find the magnetic flux through the loop when the plane of tps)/ bjyqx8 6khe 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 ad9ipkw vhrei;p8,o-i:justable 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 chan7y,pcdb3r j:z ges 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 s bdggfql gm y9615k0hu3dn+4t. m 7hwa 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. tuq+6gl fyd4.b gdmhk3s79m0ngh15 w0 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 turns and an xu1smt)2 /8c z51pwa cl+x0mbone 8eyarea 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 arebt9xi q/uy6t uk --.dmxu8+ o; jdka3qa $0.20 \; m^{2}$ 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 horizag4sub t+mrk .vn,kt14 7 qrv3ontally at a location where the downward component og 7b.amt,uq+ n14st 4rv 3kkvrf 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 angular ,2 tujuiv5. rg 8vvqg(wg:kti920rc vvelocity of 2.0 rad/s about a vertical axis through one of its ends while in a constantw uii0gv.(v rc,q2g85utg vrtjv:92k 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 ande5e79i e r,r ikbhc.*kx 9qd0)c:kpda a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 1006zocu o)d76u4t y ktr0 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 rectangular loops on its armature. pb .s*+elz/i g cl(h-kbp20 hmEach loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel bb.mhz 20gp(/k-h*+ lcpes il 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 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 consir)6f; 4jo2h pf rfh8pdsts 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 output of 12 zvy0b xi9/zvj k3 -*td9yt o8uV maximum when rotated at 608i9z 0u-9tkxt3*bdjvvy /zy o 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+m-kyrf8 oa1ku4p z;ju 5oot*xa7 dk . 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 resistr3v+i+/ 8a(h;wvce gzhh(q v nance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor hau e5bq:m,5mqm3 m8 pux-f5px.t oa-quve a resistance of 6.00 W. The motor operates on 120 V AC, and when runnuax5-xu p38ft5 p-mu5qqqom m:.e,m bing 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 internae,90ogq jsj0al resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-ups o a,0jj9qge0 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 resistancebz*,mc y 59 4bj(kdzei2ln9 th 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the bac9z kcy(2hn t*e jd,i5bzb94 lmk $emf$ 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 rxg pd;n2nn:q 8n1 8xbcesistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the ba2:dxbnnnqxgc;8 pn1 8ck $emf$ 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 isw-ll ok7d;l q: 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 primary of a nbt:f4 xn 0cdqm5q-x9+nj .f*ia zs*z2bl.z ntransformer causes 14 A to flow in the secondary. .n 9 itb q5d fnz-z2+x:nn jxac*4.sz*m0blqf How 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 manj o)ykng9 c7m.y turns are necessary in a 110-V primary if the 24-V second nomjgck y).97ary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn se gqmi04a(p1,v yzz 4ha:ti. wqcondary coil. If the current in the secondary is 3.0 A, what is the current in the priwmi41vapy z, 0 h:zg.a4tqqi (mary?

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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% efficiency . cs87jv*dgwv, how many amps at 7vc8 wjd*s.vg24 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 t ./* 4f1wezy,fglcni 2jo+gyxvwk * g,ransformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What,i xo*f/yygg*w v elj,nz.kg4 w2fc1+ does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on itspu/jzfw,48 ax secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present f azj8pw/ ,xu4in 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 :ol2 p jzhou :q9 mi,p8d9pg9kon its secondary coil. If 120 V at:982j:qmop g zdkp,u9ihl op 9 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary hasa7 qt-ty qul y;log(+( 200 turns. If the input current at the primary is 100 qlglyt((o ty;+7ua-q 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 secondary has 200 turns. 99y(a.4p r v)llilj w.nvhi0 p If the input voltage to the primary is 100 V, we can expect the output voltage of the sj 9pvv9h(yl0a. l p .ilrn4)iwecondary 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 14u ;r o1eg3un2ist7 vs00 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondag usr;ueis 1 vn73o2t4ry 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 ofi1g e) *rie7hu current at 120 V. The voltage is usually stepped up to 4500 V by a transformeh)i* er i7egu1r and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 6mx xu*.k/ioiA of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted throx6m. k/ iuxoi*ugh 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. The voltage is usually stepped kh z/7t uv3 ornhj(-me*38uir up to 4500 V by a transformer and transmitted through a power linh3eo-zi n7/t3u*kr(uh m8 rv je 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 resisyl k8g ;l3*mlr7f.qjp tance 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 vof.kl87pjl ;g3q ry *mlltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance hvqwz8i wjaq(42e :* eof 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 iwq(84v: aq2hw jizee* s 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 woulm1koxm v sc7 +w9i6(kyd be lost if the power were transmitted at 3000 V instead of at 10 m 16w9+ois( vckkm7yx00 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitp;o6juzo; p4ra*kn m0 ted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is no ;jpzkr a 6op0u4*mo;nt 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 energyxk1*;5atp7da, z zg0vk+ (.8t-mpcdwcra bi e is stored in the coil's magnetic field?bmpzwx8.;p*adg av c ,5a t+ie0t1 rdkz-7ck(

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. d5s rogu3(e ge) kq1g3What is this cgkerg)e5oq3(u gds31 ircuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage 5hmzfquk8*9 1 d;4gprbuoqq: in 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 inj,oeepzfo 9f5fe/n85 to a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the rz d(8fajvsj so4cc zxpy4zw7d-(52g+ esistance of the lampozad g4 (5 2s4- 7c jdzjpvy+(s8xczfw?

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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 1y jq:6(n:wxmlsz n o)+20-V ac power supply. What is the peak current through tq z)wnnjom:y6: (sxl+ he resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supplyxmrwu8ew+a n5dbr(* t7 d p7l+. What is the power dissipated +(r dmd8lwtx77e wn+arpb5u* in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resisn exuic 8bg/k4 724huzxi2i-ytor 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-W resistor iswg, cde,qe*p r8pm1r / $I = 0.80 \sin (240 t)$. 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 50-1*lvz qh+4* eaj8kk0 (znxg-jc*ra avW 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 8blrytec pv9jtn1 23w5/zov.te9 4jv f8ct o 6of 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 reactance of a 2.50-mH coil at 1fx e v-ixl+a2+ph h)s .u-tan2000 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 ofn;bicl/oi2q1 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 necessary for 157 W of inductive reactance at 1000 Hzz6 ztu ;tt8lblp9pyuj8a abn9(wm ,+;?

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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 at a frequency of 20 kH:rkzp /6mo;qb 8u q,mtz istm8bpzq;/ko qr,6um: applied 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 a8*;4q qehn 0wdwnkj c,ayi7 hxo 3x+.to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor aty7 i*c(oijf 2u 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at 10 kHz?7qq ;u4loec u,

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of z9 qjn7,1r( lakv9axr 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 ;lo .q f:-fgq4 .2lqexgxla,g capacitive reactance of a 0.010-mF capacitor be 100 W?lq. exq 2l4af-ggl;,q xg.of:

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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 1000oxrozp /9x6 *n 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 12.0 W resistancls16nj hv: qpt4wz06a) h/hf.c v/kan e, 15.0 W inductive reactance, and 10.0 W capacitive rea ta:)shk 6n1.cwfq 4 znvh/6a/lvj0phctance?

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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 resistom 73nv ua;vrrtfr2.; fj.6ov tr, 20-mH coil, and 1.0-mF capa7n. amu v3; 6o2rrtt.f;fjv vrcitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coidcw86 yfdru7n y:9v 9el, and 1.0-mF capacitou:6wn dy y9fd78er9 cvr 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(bud2 f;xjakk+ so52.to -ob r inductor, what is the impedance at (rfk2stb+ -5.a bkodxo;ju 2 o1000 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 iu:/9lhnnuvq (s the phau(h u :v9lnn/qse angle at 1000 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 1.03y86yh;apx l m du*sa5-mF capacitor for a total impedance of 10yh spa;xl6m a3u 58*yd0 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 d:,b7klp1btpajdg + ja t1*(lseries with a 100-W resistor and 15-mH coil to get a total impedance of 11t dk+ 1btplgp*j ldj1a:( a,7b0 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 induc6o4vm v .pox8ctor at 5000 Hz for a total impedance of6v8cx 4. vopmo 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-MH23k4leks3 h ggz for a tok3sh4g2e k3gltal 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 comqdh7i5d-yg(/wy0 zn.71 b 2piryqnf nnected in series with a 20-mF capacitor. What is the impedance at 10wpi1ny(d57qg07.dm/qfbyhn- z ir2 y00 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 10-5p 1 nm,lj+ixkmF capacitor at 1.0 kHz for a total impedance of 4xnp+m ,kl5i1j5 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 nee:i(ivdj-8rf-vd rdtch 50t )tded in series with a 10-mF capacitor at 1.0 kHz for a phase ang8div 0- rjtrhft ()idv5dtc: -le of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with aiz:1 3j,9rylcklvqd ( 30-W resistor at 1.0 kHz for a total impedance oj(3llr,cqyi9 d vkz :1f 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor (utw lem+s1,tap+ .x o7ljfdr(a r2)m at 120 Hz. What is the phase angsxa(+rptjmaw. f 7l2m l(ur+o)te ,d1le?

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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 15nrrcv/ rs; 1z500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are csnr;1/ crvzr5onnected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 10j; 9qaj 5pz*4d vkcvfe /t;p/i0-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connekv/5dap*4 ; pvic jq;fj9tz e/cted 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 capacwz n )93kndxb oxalq);x(9.h yitive reactance 30 W, and an inductor of inductive reactance 30 W are co3 )ba hknln( x9z;9ox.qyxd)wnnected 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 s; l)d*36cgy e fgs3qjferies RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H indu6s 3fjge;g*dl3ycfq ) ctor, 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 necessaonkj w .m2.6bnry in series with a 500-W resistor for a phase angle of knm.bw26on j.$40^{\circ}$ 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. Ataxy4)/o 8zy/t vvt;ff what frequency should the circuit be driven in order to have maximum power transferred from thatzyf /; )xf/8 vyvot4e 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 series circuit with 12.0 W resistaqh*v1a bfx2 23z se:yz(w8 hfunce, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is conne* (f28zuhfsyzq:132bhaxe vwcted 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 A3cjgd f6(nx; m d4t(foC 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 rk e n-8(;cdtle69bmtd esistance of 30 W. What is the power factoetb8cn d-t6 ;ldm(ke9 r?

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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 forsk:ctm+ywtiwaq)nvw3-vvd2)m(/ .n a series RLC circuit containing a 50-W resistor, a 102)vn+mw(cvnw- t .qmk td )i:yws3/ va-mF 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 1.0-mF capacitor amjaagk0*7-t n nd a 15-mH coil in series?jan*tg 7-0m ka

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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 capaci5 j6;ylrzi 2fdztzr+e ;co :t)tor for a resonant frequency of 1j2d5c tor)+zryi; e:l6;f z zt0 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant f;ug ) d38f8si0cwim/f q qz7gyrequency of 1000 H u )3isgfqwz y8 /;cfqgd7mi80z?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor mustb-icbu;4ld i dahm.soj;-,- e2 he-ob be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the cir,-j.e 4a; ;-b-2es -cobhiddub omlhicuit is to be 1000 Hz?

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