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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 magnetic flds lah emj8e:a7;xq.+ux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that ohk+ . xahi/-mthe $emf$ 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 ofy3f kk3u d,0hyc/uo g, wire in a coil produces what kind of change on the iy/cukfgh y u ,o0dk3,3nduced $emf$, 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 magnc4 imbsww2):jetic field through a loop of wire produces what kind of change on the ic2s)w 4 w:bmijnduced $emf$, 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 kindwqy /45gz fb6d of change on the induced 6y5 b/q4dzfgw $emf$, 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 fez 7zk4g98bqnb 6bsob arz4;2 ield 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,jewij x07wnxm-*s k:+ the direction of an induced current in a conductor will be that wx w jm-n:wx+j*0sei 7khich 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 h,g3fro wm4bo*orizontal table. A bar magnet is held above its cewboog* rm4 ,f3nter with its north pole 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 udlns7mgo+no)r:8mj la)4z 0bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the fall+l a):nlgr mzduj78n)4 sm0 ooing 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 the magnvoopcs.) xm2lc.d* v-etic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, wh x-ovcp*cl.)vomd2. sat 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 wherni5, ud) ut*xke the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the u5kdun ),t*ix 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 fixpjp sy4 (up)7eld points straight down. The magnetic field disappears suddenly. When viewe u)pjsy ppx7(4d 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-i+8cszzy/ pll*ncreasing current northward. Two coils of wire/ly8 spz *l+zc lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wi+ s.qk. ;ctrudz jo/g /fy 0ip6mue10cre with the north pole entering first. As the nomto j/qzp0.e+.du /c10rcg i6uy; fs krth pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constap59 m qo m0ghf::h ge(+lopxclr;0 0xjnt angular speed about an axis whose direction can;q5om p0h xm fpo +gxgr0c0lh(j::l e9 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 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 az+to7e;j4u,.cf djej+6y rl ingular speed about an axis whose direction can be varied. In a region where a undej , z4y6j7 ;ji l.t+rfuoc+eiform 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.zjrsu/0v hgi5v s,lx*mp1.x *
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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 r g3qq/viy y.wpudrvn3 2a (/;that 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. Th)4 0xnd ;)dqvqiejzt,e $emf$ 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 i*ybm.cv74 mrt n the east-west direction) is moved northward at constant *m7r c.4ybv mtvelocity 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*i/p9 ttcnex jg*r ef1( f4 lp-ff2+px rotates at 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 transfn ;dbqg:a:p4y p0w. :q*rhvt8 ena 9ymorms

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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 dvlvv/m4f6+0lwx r 2wp;9iz(c aok,dof th( v x+f/c,wv90; oz2a ipkmdv4ll6rdwe $emf$ 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 uz7vpqjm/2 i+vhdj ,0ised 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 devlvar 866 kxz0lice 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*ywp*cira f4o+c+)r;v z ,ugm the secondary coil contains more loops than the primary coil then it i*cu z4ymw a*cpgor+fi,r+v; )s 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+-y;fkdr jvbv(a 1 lq: secondary coil then+-d1f:k la( y;rvqvbj 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 pow7p c,xd , /sw*qrcqx1ser 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 circuit,xrq0 vasl k;*,

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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 battejc05gz dznbt m.n(ybp0+2kj:ry of constant terminal voltage. At the moment:j+d0(jm5z2pnnbcgzy .kt0 b 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 connected in series to an ideal battery of cd e7) hq-:rjiaonstant terminal voltage. At the moment contact is made with the battery, the voltage across th )dhq:-jriea 7e inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connec r33acemcs c3e)0g1yyted 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 3+p exp8x*j )c ai,;1xlkhi tminductance 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 0 3kld/opt3un to a battery. The time constant for the circuit represents the time required for the cur0udnk/t lo33 prent to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battt/0yz/li6n nsj-rma )ery. The battery is suddenly remove nyn//)art- is0z jml6d from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units exce g 2dx rhw+ngkmlm(jx(71y;t( pt:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this ciy x;2aqf+pafeb v2f/qbh* :5) m.k bdprcuit, 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 supply. In tv1 y r4,mgc0 ,v3kuyvbhis circuit, the curren4yvyucbrvmg k ,0v 1,3t

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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 the fr3 j65pyhsit;g7il: o uequency is thp:3s y7tol5ij6; u igripled?

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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 a2eeget)/u2 nm cross an inductor is doubled, the inductive reactance e )gnm 2t/uee2of 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 d4da75hx rf-3u kq03oyme1a xthe AC voltage across an inductor approaches zero, the inductiky 3oqa3dhde5u4 1xrm 0fx7a-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 power supply. In .go .g6z2sjm ithis circuit, the currentg26 ogmsz..j i

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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 fcri8f fss6-9-8 n*ai2 -*uvx o corfawhen the frequency is triplf fasro2c - -i6vs8 *-9* cfuafornix8ed?

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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 voa (afa1kg4u+s7h nq(b ltage across a capacitor approaches zero, the capacitive reactance of uga((b4 +qfkaah s71n 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 capaci9o.; hal)b e2ya;olo ftor in a R; a;o)l2 ahoo9.lfyebLC series 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 defyrx. uw s18v;jined 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. xbiv et)y i41- The impedance of the circuit increases if R increases. When is this -xit)41byvie 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 the circuzt(c-x /hdrw:it 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 circuit increases if d7pmq -4n bb u9n9uz4z$X_C$ 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 circui)y 8n au+9 uj8j/m invu6j+sdrt, the resonant frequency of thau8/ms j8y+ju6 +u9d)navji n rt 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 kfqk. l5/i.ez is driven by 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 ci0n*wkr *s 4uv t6s)qzs 5pz:korcuit 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 rotatingo(h nxr qg:d b15i9jow6on,y8m32pkk in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magne: p rjgi 8k6xwmy(knb953odoqn oh21,tic 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 s u.:e 41 emrejb(axb6m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpend mbaej46.e:rx es (b1uicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.207mkgk8 i.axit uck h3ad;oy4.q8n:q. T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at aa.8. q3oa8k4 tnq : 7cmkud;gx.yiki hn 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 adjustablezdee1; nc )j+r4*kiq8 zn/zp e 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 change 2*4q i6b:r*q fz,9cib+esu +7.yylqd dltgces 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 emwuf1 j 3 z.02xrjm7gframe with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the . jzexmj32wu1r7 f0g minduced $emf$.

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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 g;2ep +ty) ykyxmnl 47turns 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 8.zdh p*uc,uko p/*xc and area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location where thk 4 bom(xx;t/pe downward component of the Earth's magnetic field is tx/b;m(ko 4xp $6.0 \times 10^{-5} \; T$. 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 velocp87x,t klrf m38* ly,qgbj.qxity of 2.0 rad/s about a vertical axis through one of its l*xf,ybqkg7l8mp,8tqx r3j. ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a crc ) /jj vwhz0k,ovc4y:62tnpkoss-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 100q( rh jy* r(1vd/eni9f 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 arma*; ;jfu)atztx0 3(fk,rhd f fyture. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be ftfuxdfj;,f*3h) a zk tyr;(0the 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 consisyk0lq* ,/ gdg b f:9j;cssik(yts 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 constr:p8e4;u y4+zzoqwo qluct 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 rota: q4zo;p+ owzy8eluq4ting 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 genqf c *jl/9m;6 uooy(hee2 ,zxmerator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates one)i/ yjf2f3 rn $120 \; V$ 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 motor operates on rkl c76*c4ms 3masv )o y1ojuss49vu;120 V AC,4kcms39r1uoo7 4*ssmc v ) l6jusv a;y and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power suv -y v2(tdz;lppply. The operating current-pv2t dz(lyv; is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply ariz6 zgq ,gy+vm-7(o. The opy6zri+g-qm vz(,g7a o erating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a r(k) -rmye0 0f-uuijd24-V power supply. The operating current is 1.0 A at full speeudf)(euri -0 yk-rj0m d. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voldz +jm/jcyfv+(2o3pltage 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 wh50;ey* mgpkv- fa c)primary of a transformer causes 14 A to flow in the secondary. Ho)5yhfpg ; k0-weam*vcw 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 necessar 8hrf .7aziui9y in a 110-V primary if the 24-V secondary hasfhu .9 87raiiz 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 primaryr(i d; ej .)6p)zubqdw coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the currenq;(bw.u j)ipe rdz6) dt 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 t f)b.dnsm o;6lhe primary of a transformer. Assuming 100% efficiency,. mn) ;fsbo6dl how many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon ssaq1 -*7o5qn sfa0 hdnign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary draw0* n5osn a-f 7dqsaq1h?

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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 b vniy(g lfp 0 .8yn(ipx6d0.fprimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what niy8 l (b6n .vf0d(0pg .ypxfivoltage 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 k7g :)(rqlf4iam qsu +:) kavoon its secondary coil. If 120 V atkl7kg +sm )) ofaq(ruaqv:4i: 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 has 200 tumjal4 n4 fisr x72:ur;rns. If the input current at the primary is 100 A, we can expect the output current at the seco4:j2x rm4uf7; lnaisr ndary 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 20hkp.g-9px gn2 qd: -)c 2yyzu)a1tctf 0 turns. If the input voltage to the primary is 100 V,z-cya g)tkq dun)hc2gp:f y1 tpx-2.9 we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and nd:r8.affj j -mrb5 u:its secondary has 200 turns. If the power input to the primary is 100 W, mbf rjn .a::ju-8rd5fwe can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The vol.wuf 7(ah4 b0 nmvdin0yf*v1 mtage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in th7fdi fn(bn.*0h umy0av m4 1vwe secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually steppttj4q 1: 6xjeh zxg-9ned 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 tran:-j t1 x496gjnheq ztxsmission 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 usuallyi:e7 hj*lijb.f/epe 1:d )mpbl 5h.ca 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 ldb/e 1 5.f*lep .:a mchh7ijei)jp:bthe 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 50ir+ +a7fk8 hbq km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a h+rb+7i8a fkq 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 longy1 p:)qb+hbrz9/rv nd 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 wivb : q)+/1rnb9rd yphzth 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 * v+vi4dk)mynor*;sz x p;h2 ua 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000d zpin4myo h)vu** sx+;2rv ;k 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 transmitzb 4 os6o*ttx x0r2;zdc(fkx9ted on a line with resistance of 0.60 W. To what voltage must the generator outputxost; kzd(c ot496zf*bx2x 0r 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 t/)dnqshzw95 y;h1ij2rzz f2 5.0 A. How much energy is stored in the coil's magnetic fiht/ 2 j5;hr 1nqzis9)fzyw2dzeld?

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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. What is wrnnb 1a8: ;*zeuj0c mthis c: ;c wnz1rn08u*jmbeaircuit'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 v/ uh3 wc6hahf.c56vi 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 into a 120-V AC ou8f8 muxk 4h6 :epk,mln)iq 7yptlet. 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 ACa68c (a;myjo j outlet. What is the resistance of the lamp o (8c6ja;yajm?

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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 sua+5w 57)-ne1blxgc l la5zi cfpply. What is the peak currentgcix+f1 z5)-na5a l5l wcbel7 through 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-V au oga /oe:x*.tc power supply. What is the power dissipated in the rox t/.aug*eo:esistor?

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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 rej;f mpsx+8 ,ersistor 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 50-8wdd6d(6 xuvp W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W r queo( -w1;hnuc59xrp: ,ce (k ndgde;esistor 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 qdrb6 iw n/q2rj..-cqof 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 1000fzz: z0y4u2u m 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 coikbx mqqrhru.v(5u p h510(sn6l have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactaxp+mz;hctf*8mgn0jy-y0 *7jn+* kw dmwi lf)nce at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency 5 lal x4ri6h1p b*cawy6vc3*ocls 5h5of 20 kHz is a*llhx cbwv5cirya54lhs a *61c63 op5 pplied 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-mHl /y4lz(3ekfdds(jdzje7 /f*:; az o e coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacito:l3vijy; h:iej qs8e3; m+rzir 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 reactance at y:,xok5+py *nti0 atw 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 have a reactancrduf.t6g 7bmq3c*y8ue 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 willq) /r;iql4sds the capacitive reactance of a 0.010-mF capacitor be 100 W? ;rq)dilq4/ ss

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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 0.0z1x28moz,xdf 010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15:u b 7jxgixyh0+fi e1..0 W inductivigiu 1y7f ex.bhj:x+0e reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, and) ubb 0fhb+v*9s hlgw/ 1.0-mF capacitor are con0/bsvb ubw+) *lfghh9nected 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 1500pen xzlk+n90);*c w ovv +x2kp -pa:gj Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are cpekc+an2ox:k;nl pgwx*vvj - p+z09 )onnected 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 ,/f(hvtcb 4vtconnected in series with a 20-mH inductor, what is the impedancev cht(/v,4fbt 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 theb)uw j)v lok,5 phaw)5j ,kobuvl) se 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 serieswz pb l)b:x8tk hjlhr4-eps6 j.z+6r7 circuit with a 20-mH coil and 1.0-mF capacitor for a total impedanc) tre+ -pk4jhx:6lpjbs7z.wb h 6zlr8e 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 resistor anqjr)s ie09bust*(nb vl/ . wj6d 15-mH coil to get a ts /6wqe9tu(* bnjij0s blr). votal impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH induct gm2b71s c)gbzxgo-g0or at 5000 Hz for a total impedg-b2g 1bg 0xg)7mcozs ance 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:(sh38n b pmtz put in series with a 100-kW resistor at 1.0-MHz for a total impedance ofbnm( :t8 ph3sz 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 201 pfax/hd ;g2d-mF capacitor. What is the impedance at g /h ;fd1pdx2a1000 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 neegu dfpn ilo5n6 pa/w8+; :g*jaded in series with a 10-mF capacitor at 1.0 kHz for a total impefwg5a8panl6ud/p o *:nj;+ igdance 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-mF capacitor at 1.0 kHg+ m(zvkylk 8d369zw1su ;nntz for a phase angle d3z6yt gnzmv w(k8n k+lu1s9;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 totak9r g4t6sjba5 l impedance 964 5s grbtakjof 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 xu6vm*a)4 vp;w ou*rx7y xdi 0zq.4xf capacitor at 120 Hz. What is the phase xmw6 u q)4av xz;xf.u y0rod*xp4v 7*iangle?

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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 H : s;,c+ kz9mtw0eqkojz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected ijc ks9wzekmq+o:, t; 0n 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 100-W resistor, a 10.0-mF capacitorbf i7dt)x kn6t/0s0 mm, and a 0.350-H indt0/ 0)skbin6t7df m mxuctor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitors7knfl9;e nn-/ *0;t icggfih of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hzihgsnci; f9n70 t*le g-k/f ;n power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit contai +0mf2hk dhc)yskbb4qke8* +n ning a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power qbmy+dk82 ek+bfn)s*c h0h4 k 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 necessar1eyn lv,)egvxya*j+ hy/ym. :y in series with a 500-W resistor for a phase angle ogvey)m *j l+xye,:y/va nyh.1 f $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequencyn,tsydq.i hvd i157x k q9u3w1 should the circuit be driven in orders.ky39x di5twqi7d hn v u,1q1 to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circpx5m 8wax3dywr b f561uit with 12.0 W resistance, 15.0 W inductive reac6b1xfx5w pd w53ra8 mytance, 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 cirt/6 -p+ixtjbma /1altcuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. Wha7nl;tke*ewwt aqu z f1 6;q),lph:u3gt istalfu7,*hne;k6 tww);gq pe ql1uz3: the 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 circuit containing a 50-W re v4qja *:z utgfo,0 iw q35goz 5yi.nz)0erlf8sistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supplyq z gti,l3zy n qz. 0we:rj8a*oif4og)5f50vu?

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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 ptxg5 b bzoc809 9:)ncjis r:qin series?ig5 :st8r boc0cjz:9 )nq x9pb

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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 inqapy+g 3 )1iz)i /gwz/1 lgzhv series with a 4.7-mF capacitor for a resonant frequency of/gpgw/ aizyh1 z vq) 3l+g1iz) 10 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 nee)y1pk7f w::v:qbcrdv ded in series with a 3.7-mH inductor for a resonant frequv k7qcb::vf ):w d1rypency of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in se.2pwcj3n u( ncries with a 30-W resistor and a 40-mH coil if the resonant frequency of the cir.(3pcucn2w j ncuit is to be 1000 Hz?

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