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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 o.e wo gy )0kvzwre9g+;f 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 induct(z f :-h5lj,)iygztucq*nl 0,en2x pgion 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 loopsn. 1fbeser55 yzx7jz2v6zg k 7 of wire in a coil produces what kind of change on th5 kn1f 7br2 vezzy.zxe gj675se 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 ma- ts 38(dfb,lh+ bmvjqgnetic field through a loop of wire produces what kind of change on the induced + bmbt8hd, f3-svq(lj$emf$, 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 wv7w m6c1iw k15vn 5fichange on the induced 7 n cwvwk5vi561w 1fmi$emf$, 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 magneticu(d9 xhbdz7 1gky4.df 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 of97c;nzs/ kbes fqd c r:,//yso an induced current in a conductor will bz k7dss e;9/ c,/cyf:rbs /oqne that 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 sp f1t u0f65)jnnxyo2 table. A bar magnet is held above its center with its north pole pointingn 0s2o6nftjp1)5yu fx 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 tabs7b9sm;;, (zktz p prple. A bar magnet is held above its center with its north pole pointing down, and released. ;pm( rk9z; t, zbs7sppAs 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 rejp:-tyx;e oixezo+n j lq31-/gion where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the inde1y:3z/ -nti qpx;e j+-lxojouced 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 whe0 io 7zlfzm./mre the magnetic field vector points straight up. The magnetic field sm. 7imozflz0/uddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horl71.4kqjgp m yizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the inpqj 1 k74.mgylduced 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-incl,:i 461l9 m ritiisxz3.eg ywreasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced currlsgwx9., y1mirei: i4t l3i6zent 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 loie/ t.* bgpe3aop of wire with the north pole entering first. As the north pole enters the wire, the ibp/a te.g e*i3nduced 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 aph8uyvua(u:3p/ l *w qacfou6/ ya/-s t constant angular speed about an axis whose direction can be varied. In a region where a uau/*fu- w u po:/y3hs8cu(aq6 pyva l/niform 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 angular speed about an axa;ms5ct a qht7*nrc *zwh 1n38is whose direction can be varied. In a region where a uniform magnetic field points straiaw* m71ac hhtr;3zct 8 s*nn5qght 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.zv(/56fdje ax
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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 tham nu6 t)*;az8jara 7mut 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. Thev bv):rd1 bub8vl 8nz1 $emf$ 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 directw9acc3qep*e dfe78x8jfz))j zoa4 xi,;t3 m gion) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced wec*ixjpc7eaofmjg )te8 3834f q;zd z ) ax9,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 bd,i8nvz z18.;(yg z9cta2sc lm 0ansqar 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 trans*,hfb)fat r +hforms

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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 eac30y4d;os w6 nez6ejvq h second. The frequency of t6we6 s 4y;0j3vz ndqoehe $emf$ 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 deviclvpw: i.sr204x .btqw)wgt- ce used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device trj5yr w1nuz6r :d24fshat

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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 conta1(gienj- +qcv -typje(z+ 2wrins more loops than the primary coil then itqgyp-ce2 r(1v+j-nt w(e i z+j 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* y2jfibggc8b ke5.) e loops than the secondary coil then it is ac)52bge*eg kji 8.fby

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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 -vrh3hlz9m npcu3ql;( 0a4.mks .d om 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 c-o3mbbf 4,)sl. ukgpyircuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of conx7p n9-zua im3stant terminal voltage. At the moment c pm9-xn3u7 izaontact 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 conn,*dt1. rbhsyct:ww -eected in series to an ideal battery of constant terminal voltage. At the moment contact is made with t -w1t:ec.dstyhbrw, *he 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 resistanf (0hvpfw1 y,nce 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 y+3ccq3;yn xr inductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the 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 inm 3-o fsvvr+f0d(lb2 n series to a battery. The time constant f+ srm3- v0fbln2vod(for the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor kvx d.z 6*xp5zare connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the pd* 6 zx5kv.xzcurrent 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 syz-4kb0bi w2)lx keu8ur4l9 hame units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the cu2n,+5t i8h/4mn wlesl 3fqlyvrrent

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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. Ip9 zwt)e 6i+ctkd/dt-n this circuit, the currentwtz )dc-di/p6t e+t9 k

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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 fac eff.m1g +kj6jtor when the frequency is tr1f+ 6mgkjefj .ipled?

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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 volprh.ugxgc v0d o7c+dc/*on.4 tage across an inductor is doubled, the inductive reactance of thgh*uo40 nc7.gxcrd/ +o .pvcdat 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 across an inductor approaches zero,+rg)/* q u15gvzccq0laj xa 5p the inductive reactance of that coi0g av+c/lg5pz qj xr)uc5 a1q*l

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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 advwtw, ,n,q43f/g9hrx u r5 etn1y; own AC power supply. In this circuit, the current1r3,nnr uxqy,tg we4tw9;/ ovfh,5 dw

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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 b iuqi99 r7paq)y what factor when the frequency is triu9r 7p a9q)qiipled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, thp.9 m mf7-.b ig.7 dktsox kmr9wbvx:0e capacitive reactance of that capacit.7kvxdbt9pb90. : rsm 7mw o -m.ixkfgor

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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 hg0w :6(xaoqs +msn 4fand capacitor in a RLC series cirw nfs 40+hx:aog6( sqmcuit?

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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 c( wqu7.mfyi8e 2 2ehh) ta8dslm*m*w/ w6dnh uircuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedax .am mj r.x)vv*,aned3bvy /4nce of the circuit increases if R increases. When is this statement trurje3d,m .xvn).m/y4 a vxavb*e?

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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 ohgihj*:ia9mxe ,: b9nf 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 impedagioc thu u1m198xd4v txr2ss3)-g-ppt ,pg 5cnce 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 and thesmi l q8p n7(83m4suuh 6el9cz capacitance both double in an LRC series circuit, the resonant frequency of that circuu c3nm 76lpus(88leq h z4ism9it 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 r2qt8 )*olded 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 circuit oc+yxn0 ay9 yee 8)v)hyhcurs 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 magnov1q,7 xlmn)e21yzz w etic field of 0.20 T. Find the magnetic flux through the loop whenx2v1yez ow q1zlm7n,) the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform mag l,-dk vi5bkusb7,)hr netic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vecto k ,)kb,h5vblid-su7r r 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 rad5awh(p( f dy,mius 0.10 m 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 atywfhm(dp(5a , 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 loopzbf 6sd8q.+hs7t b t5p is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes fx8xizw p/-ezhet r 4h:r/6,cmrom $4.0 \times 10^{-5} \; Wb$ 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 9zcpl w,w.f:qon a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, :9f zqwcwp l,.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 wb-s550lbzcso ee+ ,kw3ec ae*ith 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 areg;rvi 3nx87zza $0.20 \; m^{2}$ 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 *s9wb:didh 2y s ce4t260 m flies horizontally at a location where the downward component of the Ea 4sib*tsd9dw:ceh 2y2rth'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 constantg :ap3j gt3:d0m n pk*ghkh2n1 angular velocity of 2.0 rad/s about a vertical axis through one of its ends :1nn:3ggpg 2h3j 0mkh pd*ktawhile 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 5mu08j w dmv:1(+9urb too(cov- s-sbh0 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 consiwmt(m6-/8 egp6;l lse lo epm11i :eodsts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops o ktzm 5/m7z1q5d,hs4moe. xrz n its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates atz7kt5qrhm /dxz zm.o1 m5,4se 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 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 tu+c2lotcj)7a i3do3 8g,e ivu d vv,;rkrns 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 conia4 :nf6-m8yx;na;3t uivgd jr w6/llstruct a simple AC generator with an output of 12 V maximum when rotated atldyg/nai-j:nr tf8wm ;3iul66 v ;ax4 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generat:q3egn1/ro mv or 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 s oax.w3h n4br v27qy;cr+9ot6.00 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 motor operatea.ooz dfq,0iq y (qs98n eo9.ms on 120 V AC, and when running at full speed it generates a ba ,ao isyo .9e8mon.zdfq0( q9qck $emf$ 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 6aadc4t5zt g )c;guc 3to a 24-V power supply. The od u;c 6g 3ct4g)czaa5tperating current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected :iz/p1qspz 7h to a 24-V power supply. The operating current is 1.0 A at full sqp/zp h7szi:1peed. 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 24-V powe gevvbwq5-w, +r supply. The operating curreb-5w gwvqve, +nt is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltage:x; 9v18i;x)nq s jqlpuses4x 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 transforme ifyp;/2 8c8n -qffrler causes 14 A to flow in the secondary. H nf f8r ;y28-qifpe/lcow many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary t)-y a2xrs t1s6 2duxrif the 24-V secondary-21as) tr dxy62xt rsu 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 prima5k34uyax 9;e3nnj4-z ese a-zlqrc o )ry coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the ;qa ek4c e)noju 9yn35l s4a3-rz-zxe 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. Assum pe85 ypqc3au8 gu6yd,ing 100% efficiency, how many amps at 24 V can flow in the secondary?ya6,y p qg du8up583ec

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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 prohqk*k(.y r ryz )n2-c ld4ih6:tr*zjsym34 d xvides 7500 V at 10.0 mA. The primary coil operates on 120 Vc*h4nzqy2:*l -.k i(r64d kjyxr hd3ztrm s )y. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its s-. nct, syy/irecondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is pry, -yi. tscr/nesent 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 hed+ e+e5rv3 hdas 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in5d ervee+d3+h 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 haj 9/:tzntrg d3b hz)-qs 200 turns. If the in-ngdtzq 9t3/ hr:) zbjput current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turkhkdfr,t 2s+ )xurlefl2nno 1( f:9bv; 6vo)dns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondkl:xl6e nsrbkrfn2u2 + );)o1v,hfvdto( 9dfary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. I8ptyby5ch* l3 f the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictionahbc8*y5 pyl t3l 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 678r:fcf /(dw:y ukfw x0 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if f7cyk( :8 :/fdfuwwxrthe 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 u - 9ivzyj3,jke1 hyt; otz,nn2sually stepped up to 4500 V by a transformer and transmitted through a power line ofy,-i z,;3tk1 jhz2vo yn 9tjen 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 steppe4kmz4tor61vq s 5ww c,d 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 thesw,c 64z14k5ortvq wm 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 W. A n)hqm+9h+chh y wi 4o1generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmissionwi1 qch)nh oh9+4mh +y line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission linep(0ruzzb ,6j4 wok7s-ongp, e 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy g -u( se6oonb4ppz,j7kzw, 0rloss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy 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 leslq.a ak3x0 y2m7bg2g6 :dzap os power would be lost if the power were to z.a032 b ya67lm:agk2xdpq gransmitted 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 transm (()ryl1b4xni 5srf wuitted 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 transbu(r1i r s45w()fyxnlmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is str;3cvx:etmqu9gpe,- ored in the coil's magnetp:3- 9eex m cq,v;gurtic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. Whazjus64jcw+tkxc*b o8x 0y .8kt is this circuit's time con cw+*o 0s jty6cj48x. kuzkx8bstant?

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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 5p9:(-fd xdrk to0qm5c)msbbcircuit 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 qddq+3gl wn8i3j q5 g6 beiwuk-1d.s3a 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. Wha8 je)boibm/x/e 2 5i7hcczj 5 kbd+7kpt is the resistance of the lamp?b zj 7 e55+)icbb7 pkj2/kmd/e ic8hox

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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 pol07 w.5t u2wd)qyf8/w lvkanhwer supply. What is the peak current2 tw 58/ kvlylf7d)quwna0wh. 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 12u))(- ob i(hokqn0 )sqmfqk(n0-V ac power supply. What is the power dissipated in the re bk(-sf)(oq(n o)qih)kun m0qsistor?

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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 re+l;dx:v) je1cix v* qvsistor 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 ishm,k b41azie iw,at3 : $I = 0.80 \sin (240 t)$. 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 resistor xccl4 sd,lzh3) / nu8eis $I = 0.80 \sin (240 t)$. 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 1j-j8lh m qg;x).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 reac .hirkkdwl)2 5tance 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 wi-z ry5oills2gxf8f:4 pjwru1 ws)+z/ ll a 14.0-mH coil 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 reactance ats0lfy *x sul 9uv(q-8a 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 wheks5pw)bm xyw.4l6 cci)stb *(n 120 V AC at a frequency of 20 kHz is ak l wib5) t.c6pb sxsy)4cm(*wpplied 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 cob9-y 5qmzk.4wni 3h z//jfnxc1 9p bgoil 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 capacitivemmo+ (t dc21:pkio4(wp zi l*z reactance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at 10 kHzazoa /r(w r qnx9pr)s.qw 92*dpkh+5b ?

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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 havejy-(m5tne+f ebgaa 2d o83hf 6 a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor bei1a g ,fn nyos 3++ixi-h-wm2r:f-qnc 100 W?1isa +-:mof-3-chg, qrf wynnx n2i i+

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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 ay xhx3ru;ub5-0 n ilj,nd 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, 15.0g,575b er *obtpcw7 rt W inductive reactance,o rt*p wrtb5,ebg75c 7 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 10+v,g iuu /ih:c0-W resistor, 20-mH coil, and 1.0-mF capac+v i hu/:cug,iitor 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 resio+ l440cw)ar eh/q eqjstor, 20-mH coil, and 1.0-mF capacitor are connected in serje4e4oh q /caw+lq)r0 ies?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20gpmqt .zl 0 k,l:fhbskz25,/ x-mH inductor, what is the impedance at 102pghl.ls05 :bqkz, f/ ktmz x,00 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 jjd0qk(k4ni * 20-mH inductor, what is the phase angle at 1*qjdn 0(ij4kk 000 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* gj103 th;uz,q idzww circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500*z diz;h13 0u,gwq tjw 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 s yest+jda,bq4/y4j vj -2bip6eries with a 100-W resistor and 15-mH coil t sibj qt6yy v44e p2baj/-,+djo get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH ind4b3bhm/e v 9lh s m2f6;cl,bjouctor at 5000 Hz for a total impeda sjbhhl6b,vm om49 cflb2 3;e/nce of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in serib+)qvm (txj89 *h nnzpes with a 100-kW resistor at 1.0-MHz for a total i*pn+xtmzv9bj n(8 h q)mpedance 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 co*d4-n l;e k3kj v*ecbr)i1gwvs-4dz onnected in series with a 20-mF capacitor. What is the impedance at 1000 H d1-k*e-weciv3 d4s b*);z gv lnrjk4oz?

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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-mF capacitor at 1.0 kHz for a tot yb4t)q-5vqyial impedan-4q 5yqvy)bit ce 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 capacnx,xby9g pf mg6v,wk9.s/o2 litor at 1.0 kHz for a phase anglnwxv9.kf96x,m,bs/ p g gy o2le 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.pd:,gl (ed(hef( f5xm 0 kHz for a total impedance of 45 W(x fhp,5:f eegddl((m?

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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 capa.naqvxtz(v6ce. y)1 t t,hke i3bh /+ycitor at 120 Hz. What is the phase ex,+ti. v3.hc /zq(ethyb vy k n1)a6tangle?

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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 9n enq7 -,8vr+7s hoguofo2 kiHz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series s7fi9o2nhvoor7egk,n-+ 8q u?

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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 cn1y3/y*bo9sf 3 h h rn*bt3(kd e-rpmmonsists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power syb(prs- h9 1kt*h*3 3nne/oy rf mb3dmupply. 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 capacov6qjj8c+/jl itor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in8lc/v6jjqj+o 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 anvl 5n :b9+ahrngle for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.bv +a:9n5h lrn45-H inductor, 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 necessary in series with a 500-W resistoo)chozdf/;bm8+y nu x-h/ (kh r for a phase angle ouk+//bhfho(8;z)-nmoyc d h xf $40^{\circ}$ 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 pc(na7hpf .4,d 5b,7rmrlry cn lh;s0mF. At what frequency should the circuit be driven in order to have maximum power transferred ;7 dnpcr7r h0 c(ls,p5 aly.br h4nmf,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 5 gljq83vk 6bzac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 12b k8lq zg63v5j0-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit isvv 1ji-w;wg)v:a vuc ovk0o9wa7s6 -j $63^{\circ}$. 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 impefst6; )2wct jedance of 60 W and a resistance of 30 W. What is the power factor?t6e c st;j)2fw

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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 ref;hb5*b2r o dosistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a od*bbfoh;5 2 r60-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 and a 15-m;6e*h o (rx8dpy( hmbmH coil in series? y;debp*hm hmx(ro86 (

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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 ag;9q 3euu6uio0qgy *m 4.7-mF capacitor for a resonant frequency of 10 kH 0uu y6eg3qqmu;i g*o9z?

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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 serieym;)hoq tc:.,6;gutfxxvb hlum4wiop/ n 9 ; .s with a 3.7-mH inductor for a resonant frequency of 1000 H9/n;6c,b m;wy. p tmq 4) .ugvh uoh:;xfixltoz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor k ncy* vv19es;w3gei+and a 40-mH coil if the resonantns +;y1cv3e9*iegwk v frequency of the circuit is to be 1000 Hz?

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