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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 uni9ee0 ze nshj 8wh.nh:s,gg9a6ts 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 induction sta; jtwup6lgz8-i5h66m qr (ru gtes 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 pzdton76 g*uw;mymu 1 ,roduces what kind of change on thed g7,z6omt; mwy*u1un 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 through a bh kl rc6kcwqcqr:,j67) y9/vpj0wz8 loop of wire produces what kind of ch),jp0h67 8:rbr y/9 6qkwczckjwvlqcange on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on the ind,y: t qh.ffc *akjb3s6ucqas*tf36k,cyhf. j:b ed $emf$, 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 mci .mw4z:kl2vagnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction o h-ua.8oqas;z;l c,bz3u 2yq cf an induced current in a conductor will be th;u u8cz2 ; 3yco.q,hsaaqzbl-at which 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 bar magnet im axu-eh5o j*ra6k8 le.uh:a+6skw; b s held above its center with its north polx+kasl*;eakh6 86u m:uwore-a.h5bje pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar mag6f +zq gzsusd4/pz7wo3 qpo40 net is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed fp+qfs03owozz4/7 zqd46 sp gurom 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 the magnetic field 7 + 8sl c0 mvsvi1,v.)olkjndsvector points ssvl7s,osvcd8 lnv1im.+ jk)0traight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnngvx: 9xew4-getic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the directxn:9 xgwgve 4-ion 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 wher.o:. f k feb6ll8brydo;-.eqne the magnetic field points straight down. The magnetic field disappears suddenly. Whenkdl.ln:oe;fb.bq. reoy6f8- 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 horizontakqt)y+d 8osw . 8f)lzol table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, thekdo8ftyz+q.s 8) )ow l 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 ae(ln +g9cng3(k5jta5 6 w gplq.:jytq loop of wire with the north pole entering first. As the north pole enters the wirypl5qqcg t.+:kn36glj( jw g5(t e an9e, 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+7c((fkpr pvgf 7chde 36 .see about an axis whose direction can be varied. In a region where a uniform magnetih p +6e ck7.d3(fcefse(g r7pvc 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 angular speed about an ax d+njay5 k rn:/mpn;ss ubzl9; wm8r*9is whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be n5auyk rlnj:s* /b;rsmz99w+ mp d;8 nthe 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.g2g(*l/bgp;hr2 a ksp gm5)o d
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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 (j486wu ly. on/ sauzzan $emf$ 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 magn2f,u n:thboq xo,fusn2 o4, sdu( saur2cf.):etic field. 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 3ot:n k2+0 rblk*n e.q5hm3 l6wte :fppv4wwcat constant velocity through a magnetic field that points straight down. Make a statq. 3l+6 nef:*c kpw4np l:otwtmerb 35v20wkhement 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 atznrd;hx3 6w qy80lpqt tx9)+.2vqb xj 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 transformss zoj,q4)+ /.xrk laue

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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 revolutiomb9kt7j, hm+k(. 5 fdwc6 pkryns each second. The frequency of thet fbkj5m,p+m( wyhk9k7.6r d c $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used totby, ..x ,rhyt

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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 devic3zebkbeizs l)(pt ky(8(:+ap e 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 mfq2,o1*bf6fijgs /ggmwj z76ore loops than the primary coil theg j 1iffg2wf7 zbog/j*mqs ,66n 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 loops than the secondary :( tk5ex3lei6 rig/5loar (i czhx7g.coil then it r55ialetcoe i.:k (6g/grx3 h(il7 x zis 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, th+bu+lgs fy) / v0gy-eve power 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 circu e y7ggb,f3gwso.eb6o2 bu n9/it,

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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 batterafhe7kbr8qw86 wju y* h);o7m41l + esr1tuzuy of constant terminal vol a eows ru7+quh4 k7*);tlyuzh8b11rw jm8ef6 tage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connect:r1 qftp-z91ws )e(xbi 9tz ox78hrmqed in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the (1 9: ) 8r7bstqx- re9fx1piqohmz twzvoltage 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 indu,yott4g 4iv6m ; qj:tpctance 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 inductance L and resistance R is cyq h) 6dvff9 20cdorh(onnected 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.m6 oyrcuf h33zb4b no83y(c* -yzf2bl The time constant for the circuit represents the time rezybl3u2-mobh co433(68nfz f by*yrc quired 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 invi9(viv ,dvfx( y f;ndu 28,ddasr6d9 ductor are connected in series to a battery. The battery is suddenly removeddv nf2 (v,; d 9v6(dvxfuiirda8,s yd9 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 s)o72*iwizeu. - q fznq *n1aehave 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 connecq1xs /y)( sxqxted to an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an ACm *5k+am swqavey9 dmg;v)4n + power supply. In this circuit, the currenwmky+gv ;q9mds 4 )*n+5 amveat

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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 0w(zqu+h, odpwhen the frequency is triple z0o+(ph qu,wdd?

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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:o:h,,qd tmg jilj;;it s 8p2h AC voltage across an inductor is doubled, the inductive reactance of2 lt i:d8ho,;m:j pjhqi;t,sg 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 voltage2,v + f6chdah51xj9 vji; fcii across an inductor approaches zero, the inductive reaf; i +vv9xiich2 6fjd,aj51hcctance 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 tolci x(8:xd87fhm xwa 2v51kg h an AC power supply. In this circuit, the currentf:5kia12(vc7h8 xhl xdgm8 xw

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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 what factor when to 6iw 1r5udxkj9x9vi/ i.meq 2he frequency is triple viw2/rx qiu.9 o6jx91idme 5kd?

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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 capacitor0 x3iyx;no ef) approaches zero, the capacitive reactance of iny0)f 3 ox;xethat 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 iq)+b0lettxubm9zb/ : f c m33xnductor and capacitor in a RLC series circuit cq0)zmuetx/ 3tmfbl:9 b3bx+?

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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 deaw,c de2hsh;0lk9bh 5fined 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 imp2ilnd0nkk yc)km(*-o 6 jyhjpx0-pm) edance of the circuit increases if R increases. When is(kh 6-2j0njkyo)*p)ni dx-pkm0l c my 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 impedance of thet2n h+-cwe w.z 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. Ta,7rb bf:2cqct 0uu ;yhe impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance andpyos-p1ug *b e(5 e ipt9a+)nh the capacitance both double in an LRC series circuit, the resonant frequency of that circehp9te* pp1 ubygn 5 i)+s-(aouit 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 rsp.5-4 ccda)yn isd8aiz : 8kxesonance,

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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 occurx utoqfhq4 +bvp f; j3+3v(0bk:h5j lps when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fi olpx4x /s f5)z1wv.hc vh x ub*)imhdm8:rx5,eld of 0.20 T. Find the magnetic flux through the loop u xx,cz14wdpxro.mx ) ih:m)h8/b s 5*vlh f5vwhen 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 rotatiy;etpw.mik(7p me.s c;9 iqbcl1a(z+ng in a uniform magnetic field of 0.20 T. Find the magnetic flux through th7zck;(laq1ce tpe+iiwy9 p..mmb;(s e loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field uzv k9hshpkf q2i0/.:of 0.20 T. Find the magnetic flux through the loop when the plane of the loop qz/20hsu9hkfkiv: p .and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single 4mh7g ek b6l*h 28o4:s y8tfrr5tbbidloop 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 coilb:ydrvtv( .t ; zhl17v changes 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 framvco gpa0*je/ f 33o:ade 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 8v0c33dajfa *pe: /goo.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 wiue5sx(pw+ xg 6ulqz) 9rc0kx*th 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and areajde9yhcy(2 /we-qe 9p $0.20 \; m^{2}$ 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 horizontallnw3 k9ljs nk;+y at a location where the downward component of the Earth's magnetn39 skknl+j ;wic 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 2.0cpen)z/ )+sk n. sk9kl 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 fiel n)z/n s)lpkc9skke.+ 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 hk8 z upb2x./fs4,:z5 fug7iyapq sk2tas 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 consists of 100 turns qqmj,/ e;gz ;(g-mqyo1 v aah)of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is /szecjl*r +u /12 cm long and 8 cm wide. The armature rotates at 120/eu*z/ +clrsj 0 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of waq3 7wdap /qb,ire 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 consr dg mclel/49 nn8ll/5jgc ,y;truct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil i/dlj, cgm c8ln4en l; rg5yl/9s $100 \; cm^{2}$, 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 7bqve09 kp1q fja+, xh$emf$ 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 DCa rp85 s+nne,taw 9mw,x(wni w3 b*v:w motor have a resistance 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 have a resistance of 6.00 W. The /7n b6 vx9 y(sqiv :uhzve6jn(th3 e:fmotor operates on 120 V AC, and when running at full speed it generates a backny i(eqt s ::h7e3x 9uv6b(n /jvzhfv6 $emf$ 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 We.r4m bb 74sti8n0neo is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up c 40 esri8nn7t. meo4bburrent?

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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 6.0h0dx,(z xs 1z+ft-vl u W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. Whl (t1z -,hvs dfuxx0z+at is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power suq2 .kqzs1g2jmau :6d jpply. The operating current is 1.0 A at full speed. Wh6.j am dqqjuk21:g2zsat is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primatldej90d lp6 6r(q4en ry 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 causes 14 A to flow i0c uku ooz-a,o5t 2ev 1)ytzg(n the secondary. Howgzz)ou5y1 0,ev-2 utc aktoo( 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 necessfz y8l/ ) v*;m*z*t,/mcposivs6tql mary in a 110-V primary if the 24-V second)s6vpvo/mmqz/t *ct; zm l,* * lyfs8iary 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 primarshxz1i20bv vz (+ g ,7:j lordundcl9,y coil and a 2000-turn secondary coil. If the current dcv zo0vx g2h7uzl l, 1s9bni: +j(,drin the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 1 ;+/:myvv/:xcoj,b*o , csv0ap qji ;m :ejsrz00% efficiency, how many amps at 24 V can flow in the secondary s/ x:;sazmcqmiv:vj:+ej bv*o/ro,pj, 0; cy?

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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 provides 7500 V at 10.0 mA. The1*s:h9wd;fmr 2-xvqp w49 apz3y dgmv primary coil operates on 120 V. What does the primary d;d-4 xy3am1hd9mzv2vs f:9qg rpw p*wraw?

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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 primac:4ptvyc0rp/j f l3u8ry coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage iscyvfc/0j ptr 83u:p4l 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 primwogxjy w2o a,f m.*)+(;wd3rc bo2gs rary coil and 300 turns on its secondary coil. If 120 V at 2.0 A isobc s2) yr ;f.wwm3w g2+ord(*g a,xjo 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 has 20;(9,ltot (mo- l5ennmgbp h rhti 0v430 turns. If the input current at the primary is 100 A, we can expect the output current at th(o(rvm0bmlnh h 94,-l5 3ttoegnp ti; e 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 ai r.5pzxn 9 ewj;jfc)7nd its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the9x)j7j nwr;.c pz5 fei 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 trankrir* u1bh2w (sformer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, hirrwk 12(b*uwe 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 ou j d4cx4dl6*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 reslodd xj4*6cu4istance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 12p : 4i -z2nn/cv/uljwk0 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission lij :k in/2vwu4c-ln/zp ne.

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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 uj.yqb:rf;*aoc 1yat8 sually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percyb* ;.jfat8y oa:rq1centage 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 g r yni2pegsq5 5s c9:vd5t4r;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 or5p5 5; g4n: e9tqrvsy2di gcsriginal 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 7cap0z vv-a. h-f /ziqkm long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of/- hvpazc0. zfqavi- 7 100:1. 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+f/ ws q1mh+(crvai 3ld;tni2 -W line at 1000 V. How much less power would be lost if the power were tndm (+ 3iws/l;rqca1t+i hf 2vransmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted odc46 ul +z4h;otd1pjslt f k r+a:h6,jn a line with resistance of 0.6z6lkschhtd+6f; aujr+j4lpd:1 , to4 0 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 vx )loo;+:sik0q /uib. How much energy is stored in the coil's magnetic fs/o+oqx i0ulb;kv :)iield?

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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 4w,;+hn th cptand an 18-H inductor. What is this circuit's time constant? ttn,; 4pwhh+c

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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 vol5e9v3- uhph 0 wsa0ogbtage 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. W/esnns3fabs nr-.ew-1.f h(4 xltt* rhat 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 pp drxv96)zo:l 2fn3 f**ctwxthe resistance of the lamc nrdop6x)*pfxt 93vw*f2zl: p?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is thya zlfo.r 5r5l*zv(gg98 j.gse peak current through.jo(5a9r5vzrg g.y l*zfs8 lg the 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-b5gi)zkrd07g s d72xpV ac power supply. What is the power dissipated in the resistor07ggs7irdx2pd) bk 5 z?

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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 resist )p)l7,swus+xm xbs zyk bl;)7or 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 a7;ey21 / d w7dddmdizdrj-b(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 50nk.efcrz . l48mamq ar 5.i)io)(gm r,-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 inductoa2g9ja8v 9vnjr.d 4n r,+zbrur 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 inductiv3hy2l 1 dn0ayte reactance 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 havgv o7me8wqo+ 4ecwb3;e 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 10oi02zivm :i3tct h+ n ,7j5iz-3bd1v cas-zph00 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a fr**o,l .h r: plaj8obseequency of 20 kHz is applied to :,*lj .r8sleo hobap* 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 1x w*o71imb p(c10-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 4.4k6lnenvlpx7f15 c a3lxg.7b 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 reacb2u0u* ge,y vplks 43z0tx ;eftance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor h 1ijup;m:,pfj oqj6e6 ave 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 rer6:j s mygwpqg(7 -:vractance of a 0.010-mF capacitor be 100 W6:gs -vwjm :pr gq7y(r?

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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 and 5.0 V?p,fbe (0;a fns

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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 in+q9:m,kcj+;zd uj m2kjyh5u )z u lp1uductive reactance, and 10.0 W capacitive reactan uk1zqudlk mm5u)p+2u;j9jhzyc+ ,: jce?

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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 e8uxdzfai2-g i)06 ad 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor ar2i6iedx zfaa)g -8d0ue connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil,4 wxu+r u;s1jn and 1.0-mF capacitor are connected in serie x4juw1;+rnuss?

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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 inductorafbhr 6+ 6.n*ho kqd/r c,jz-m, what is the impedance at 1z 6jmd k-hr6brqo*+c,nfa/ . h000 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 7ji eu9v0 : h03w(bcvb;txkdb series with a 20-mH inductor, what is the phase angle at 1bvbj0 bh:9 ;wvcdti xe3(0ku7000 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 coi4rox(gre9 ig4g)bc d35a3r8b t6ibxu l and 1.0-mF capacit gcrb69 8x 34ri5girba4)b3o gtxu( edor for a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a c(.37tpozv9(apk nvx 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2a(7z p9 3v k.ocnvt(xp000 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 nhop )1fw7n9o be put in series with a 450-mH inductor at 5000 Hz for a total impedance of 40000 W?np)9 w1 nohf7o

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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 wggu6 l).b:lt-MHz for a total impedance of 15.6g)bwt: llgu0 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-m*le dav*2w7o 3fdh7+s xkgi0h F capacitor. What is the impedance at 100*hd k* 703gv7+d2oxf hsa wile0 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 hmnylehf 2+e 0;2 ums+*,mkvy-mF capacitor at 1.0 kHz for a total i0s,;hm yy+hnv+2 em*fu lm 2kempedance of 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 kru,5bx ud:utrv,28 fsty7j2-mF capacitor at 1.0 kHz for a phase angl8rrys,:72vdt 2ux ,uujbt5f ke of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for a tota7g2)w(l9 iy1erp9bi tj q2b zi08mnbc l impedance of 45 W8mi )ile 9qp2trbwbi7901n(jcy 2g z b?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 ,wwc*.c,uwe vgd9 ,qyHz. What is the phase ,cq*9 wuv,gcwde.yw,angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W :5gwq9rja /ig resistor, 20-mH coil, and 1.0-mF capacitor are cjg/i rq5w a:g9onnected 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 10 (du3 :on)bkrkyl 3l2o0-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power suppl ) olu33r2o(nbk :ldkyy. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, e3*8q*u8 mivrw6 t36vqkafn c and an inductor of inductive reactance 3v* n6r i8v63q8ue*cma qf tkw30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle fory vhslefgf5j--5,b . 3qz6im h a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when conyz5,fl.h6- mhb-3egis vfjq 5nected 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 resis -, 19ff.pesteq ee4qhtor for a phase angle o,-p .qeft seehef9q14f $40^{\circ}$ 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 n6poee i4s v).has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to hasie)o pev 6n4.ve maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W gz-bd10f d hs+resistance, 15.0 W inductive red+hgfz bd 1s-0actance, 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 circuitxfk1 e)t;c0hr( w 5w /qzezb6k/qkam6 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 6bt3r rp. z.dz4q-a wguaxz w0pm( ;3i90 W and a resistance of 30 W. What is the power factor?gq-p(zaw94p urzi30mbw3 .. xr;da tz

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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 fact 2xc3jv bef0g fo8v-j5 93vaptor for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz p 8geo5tj3 3p0v2 acbvj9-xvf fower 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-mH coil in serielm;k /ndm;pehs hu-ib4l e572s?me eb2l 5skd-;4h i l;7/uphmn

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a reson drv f1yk(ir(c0pi-0iant frequency of 10 kHzk(-0 ipyrif(c1 0vidr?

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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--isv v) akg+sq6zg).85ltqzpmH inductor for a resonant frequency of 1000ip.s65 a)g 8 ltqq) szv+zvgk- 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 8gv+ub l8e v(aresistor and a 40-mH coil if th ba8ugevl 8(+ve resonant frequency of the circuit is to be 1000 Hz?

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