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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: 游客未登录  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 un hoq 4rt4am::nits 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 stat+co,cjz 8et n-es that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of chang9hj: );hz xm jewhw3*,c lirw6g: e,cqe on the induced 3:j,*e er ,w9 lwh:zgx;wh6)c jmc hiq$emf$, 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 loop of wire prodmsmjb6+ ex if pt0ug34bb(.(wuces what kind s b3t04xm(p6bf.w +meg uib(jof change 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 lqck1o3 ka ) -82krtjvo 4c4apeoop of wire produces what kind of change on the induced oakop 8)ker q-2 v443k1ctjca $emf$, 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 ma64x7 :iblx5pxrxd wb( gnetic 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 of an induced current in wlzdrame985 ab04 + 3 kbmjk7ga conductor will be that which tends to produce whic0mgd8z w 9bab5lkjr 7a4k+me3 h 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 d2vp5rixpi;q3v9)1 -ueta zuis held above its center with its north pole pointing 29 );uqd ip5p atizue3-rxvv1 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 (cpxfb:i5f* oyi.e,j bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from abopf*cx.if ij,y e(bo:5ve)

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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 x 3 xj7tqt.kf4(e h, xk)ybhh:a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense ofxkjk3h. x )t(hbe4q ,:yth7fx 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 tok*nu w dug t5l*+8lys.p in a region where the magnetic field vector points straight up. The magnetic field sudden+ s*uul8*ywkl5 nd.gt ly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magn9iy vyxo3p jg41*b pk9rk/z1fh:ug0uetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in kog19rv:1 ph zk j/y3fuu0y*i g p49bxthis 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-increasi ibi,g 0-v3ch2sw )yljng current northward. Two coils of wire lie flat on the table, one on either side of the wire.,3 ybvchjigi l-20w) s 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 wire with the north pole en 90knzwuzx g01tering first. As the north pole enters the wire, the induce1zng0 k0zuw9x d 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 abo5 p k1a *cy*6zzehz*h.g hn3fvut an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientat. zeycz*hg1zp3 h*fv5hnk* a6ion 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 axis wh.tg1cv x3zj94n e(vfx ose direction can be varied. 1zg(v3nt v 49.ejxcfx In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.cy ydhc65 n05w
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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 tvt;vffuw2p gp jb k+c385r 79ahat 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 fieldea fx pq47-c y(p.uy(i. 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 ea) j)ea,zcd7e+i s jqh7st-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement iz +7qeshc))7 ,adejjconcerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angularkjf.q )nxj)h 4 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 tran-niam,uuj y,q)r :+tz. d/l 6ecen6nhsforms

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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 frequen xx0 )osb4xu1jcy of thoj 1x xx0bs4)ue $emf$ 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 t pged3oy6 4rs8 ybh)n+o

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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 devica7 rgt7mmr*(g ,nvn,8 uv :p3q:2nhk enbox8me 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 more loops than the pr ;qn nmff4-dpy(2r)xzimary coil then it iryff2pmnz - ;)4xd qn(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 tcj*y8r ra(m3m he secondary coil then it is jyr*am m8 3rc(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 a0muhou,1xn9power 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 ci5p+wn:+go l znrcuit,

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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 ili + z+azt6vjimy1/a (n series to an ideal battery of constant terminal voltage. At the moment contac li61ja ++zivzt(y/am t 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 91 td)+h rfc zw13mmme.bq-tsare connected in series to an ideal battery of constant terminal voltage. At the moment contact is3 s wtzc-mt9rmbqfhm1) e1.+d made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and rxfbp6z u,r/,ixj.u j +6yz*kt(p xcs -esistance 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 u kvh/0 abjnb:4w/l9c 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 connecteev4ee, ki)x0 zs8p5+ v v2tqmpd in series to a battery. The time constant for the circuit represents the time vpepq,s +4tv8ze0 mxek25 v )irequired for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series p v)xelf1gg.id:l (s,to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represe( pe i .sl:g,x)g1vlfdnts 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 h1 c6-6zoch2l x hxutu48kv4 egave the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, to-wc j 7ktn7uaj u4x p/9 4n;49olzk)oos xnk9he 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 this circuit, the cun(+m/nx8 vb ktrrentn+v(m/tn 8xbk

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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 .6v 0m szrkon9frequency isn.60 zvs o9kmr tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the inds 1ovc4br6*th uctive reactance of that inductoror*4ts b61hvc

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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 f2)q.b0cvjx*hj y* ye AC voltage across an inductor approaches zero, the inductiv)bf.* hc* 0jqeyv2jyx e 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.hbcdbsqfr5t-. cx,( eh.*r8y In this circuit, the currenr , ht(. s5ey *c-rfbxb.8chqdt

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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 cha7*te/zlev vd,l;j zi(nges by what factor when the frequency iez je vltv7d,;z/i(l* s tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across ms,a o)2unds3ppe 7 r6a capacitor approaches zero, the capacitive reactance of that capapn7 ),edsous26 3rmpacitor

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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 andznn6/b.tiajfvu. 0 .l capacitor in a RLC se6vlnfbta.j /i0zun ..ries 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 definx0kg4gok qbe-c5*m t 8ed as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit incryhx7xd-.e t41df sfq-eases if R increases. When is this statementf 1.t7sqh yd-dxe -4fx 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. Themidlqjg/:l(t2svem25 p-ponl7 .l t 7 impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuilmu-o 5/2x jk 9k. 6bqwwxmeb1t increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuit, the c51jfv yxxhnft; ,i(6resonant frequency of that circuit wiync1vxx( ,t i65hff;j ll

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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 volta 1fyajyr:gdu(2q*ekm* ; 9ih tge. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs eod a;c5809 geh)emlmwhen

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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 field of 0.2i; cx 321rthhv0 T. Find the magnetic flux 2ticv;xh1h3 rthrough the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic /e) iz/c : o6ihtnanz1iwnq8,field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field ve/q,z6/iwe zt)hi1iao 8n:nn cctor 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 ohgr;rg;yctua1a 497 5jj(fe:k q0j yyf 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are auy7(;4h5 yqy jkj:fja a0ec9 1rgg;trt 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 adjustab7,o td3,j u)5wa: mrh cni2yycle 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 changes frvy g natr68j8ur0c80 rom $4.0 \times 10^{-5} \; Wb$ 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 fra;e7k + .j*h;hfj fqlo+cjz9rkme with sides 18 cm. A uniform magnetic field is applied ph;ejr;l* f hzfk.jjoq c+7k9 +erpendicular 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 induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 t /:l7p* gx 5ro4tzb9plbqzrm0urns 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 area f ly4s0iu5ug cei+ul+ r+2l7p $0.20 \; m^{2}$ 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 the jth7:i, 0cch2f osew 4vv92aedownward component of the Earth's magnetic7,w s:tv0ho eje9achc4f2i2v field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angulggbh)y,** jq dar velocity of 2.0 rad/s about a vert,hjb*d*g qyg )ical axis through one of its 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 logy z )4c6n0quaops 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 of wire of area4t ump7e0f0 z) m0enj- 9jjpgo $0.090 \; m^{2}$ 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 armatj cj 2p9dybz-g.fh5 q;ure. 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, p 9bf-.gj2q ;dcyj5hz 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 nn*m)/bk/ :n ke )mdhvwire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC gl* eht :-vxymfc; .c)senerator with an output of 12 V maximy ts:cflx ).mechv*-;um when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator witx*-bgd59i n2 ha 2 drl.ogh+axh 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 -g*qjonu( dck x5g7k,s(lla1of 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+mtb0+mh1xqig ya w0 :.00 W. The motor operates on 120 V AC, and when running at fullb mh 001wyq+imxtag:+ 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 supjby 6to0 ,hb l0m;(ekjply. The operating current is 1.0 A. What is the stoh l(;j6me k,0y0btj bart-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 supply5g 1u/0.rc4xmsz*dfq g tid)j . The operating current is 1.0 A at fufd d xg*ugt4r)0/ q m1zc5j.isll 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 24-V power supply. 5fph h;wks1b p7q.vj8b9 u +lw The operatiuqb 8w j9kh5+l7fws; 1.b hpvpng current 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 primar+a:/cueovzh7o jseb (ehz)nb- //l 6vy 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 a(*p3i q(no6e jbp n-+tdcd .mto flow in the secondary. How many turns are in thnpc 6 (qa.dn-m idj(eotp+*b3e 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 nece6ne5id 8ae* ha5s0 wxrssary in a 110-V primary if the 24-V secondwaa e x6850ridesh n5*ary 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 prima4tvg x7y tf/0bnnl dwter;0v7,m58n cry coil and a 2000-turn secondary coil. If the current in 8 wly 7n c;f7dvx4v5,e0 ttt/mnrn0b gthe 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 18m( aj iti-h1m/yfin of a transformer. Assuming 100% efficiency, how many amps at jyii- mf1t1h/mai8 n( 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V atjn51jdf9q rcwro4m h 7w): (xw7ijjj9 10.0 mA. The pri5rxq jw4r7(7 wj9icfdmjn)1:jo9w j hmary coil operates on 120 V. 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 turnsc4;kd8 eph2gogc* jw /z(md) r on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in o c2(mr/c8*);g ke4w ddhjzpgthe 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 primarynpt*:z. wc:hydlr:v( 6b0aq r coil and 300 turns on its secondary coil. If 1.6 :r nq* rh yd0:c:bavwt(lpz20 V at 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 r*3a)q2 wir rjt6n9*y s:dhux has 100 turns and its secondary has 200 turns. If the input current at the tqxr ja9)hd*w *i32r :6ynus rprimary 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 z5n61 d0o mu8gxe ;qpiturns and its secondary has 200 turns. If the input voltage toe65xi qdpg8;01on muz the primary is 100 V, 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 its secondaryypo1 -v8y9zl dfp1 p5x has 200 turns. If the power input to the primary py lvxz1 89y-fdp 5po1is 100 W, we 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 voltage is usually stepped +,vqah.ypra ct-9b ep3y3 ku3 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+htbekqrp,3py u.v3-39cay a 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 120 V. The voltage is eb-o( s- )walr./cfehusually 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 thfh-e -aw)s (lcb.er/ oe 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 10gqs.vcvup4w5m l1 /u g6ttjA 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 percentage power lost in the transmission line if the voltagcju4/g1sl vw0q1vt5 . pt um6ge 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 rz* b8t 4kersy a )7;-ybiakto*esistance 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 100:1. What percentage of the original k)b baktri8e t;-sa4o*yy*7zenergy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance::cd 3 k5fpty8)nks9 fuhcx-z of 0.60 W. A generator produces 100 V at 70 A. In tcnzfs-u9ycpf dk: hx)38k :5order 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 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 at1 0ftw+z p9mp6v z4lt 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instea4mttvfz0w 9zl1+6ptp d 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 on a line wh30wn, mdybxb.ra 6fdky:;l2ez i 38with resistance of 0.60 W. To what voltage must the generator output be stepp,kdrhxby8m6iae3:yn ww 30.;fb 2dzled 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 c81vquhu(2b:a5 d)m fo*vpdn8 ai vk/surrent of 5.0 A. How much energy is stored in the coil's magnetic fi/8di 1k bhavv m25uovpasn 8duq:*)f (eld?

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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 resjo a (mrs+heyl9u*q0 .istor and an 18-H inductor. What is this circuit's time+(euj0smahyq9o *l . r 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 in an AC circuit whel,htvtyv 1 e97re the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak current?j+.a4h3j p9uv m a 885gybc plfk8sd9j

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resi s0gedy*c6v -g2ze-tsstance of the lamezc ys0-* ts ev2g6g-dp?

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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 powe72(snmv5 i1w:tv-y pq3hxbht r supply. What is the peak current throughwh1 5h2-t7y(pn:m v x btqsiv3 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 -u87nl gxl ah;4nmjv7 to a 120-V ac power supply. What is the power dissipated in the res7 v7gllajx; m4nh8 nu-istor?

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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 resisto9krpuwv5g 4f :*x04vz hgfn; pr 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 v gi 69oc;-hpj+ogngs) .ur,na 50-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 resistork ;lrz5 m +3qor1z(xcp d1eh8q 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 inductor at 60h1 9pz.ucyzy2 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 abs;eh m0xg )0 r6/x-fyynm-jrt 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of ov :pke j9ss+/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 reace)c(aic8hw r0(d l ,vwtance 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 of f(c ;t5e xzw9o) /fq8z2itrpc20 kHz is applied to itc5)c tiz2w/8 rqe(xzffot;p9 ?

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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 tos: ih*i4u p3mz 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- yp,m3ufmz ir) ne*l3-j*tna7mF 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 kivz4j sui *r hpt:*31to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10iq wnt 06nu/y z.k8b)w-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance 0mn7*h s1qp ltof a 0.010-mF capacitor be 100 W?mt0plq*7nh s 1

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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 capaci4 gyavk *,pwff ++z4bjtor 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 cir ,2:7+mlzbejlnxn.xin; g0 cz cuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capaciti.b;emgxx ill nncz+n270j: , zve 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 coi43q ray a)dpi/-4 tbswl, and 1.0-mF 4ds/ y-qpabt4r3wi)a capacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.;j9jktso6q ,.qxinq4 tm 8og0 0-mF capacjxmo6 sjq0oq.itn ;,84gk9qtitor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what i vug.t z;9rk4js the impedance at 1000 Hjv9u .trz;4kgz?

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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 ai*( f7z7u9bm0t zqficcm .lw. 20-mH inductor, what is the ph0ubz(9c7ffq w mt.z. l*miic7ase 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 serieswl7 vpq5bx x)6 circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 lb5w6q xvx)7pHz?

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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 capaci:91fbgj n cvd+77ub qntances is needed in series with a 100-W resistor and 15-mH coil to get a total impedqgn1v9nb 7 cj:7u+ bfdance 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 izuge wz,: 7zty2t i6c8nductor at 5000 Hz for a total impedance c68zet :y gt,7uw2zziof 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 104z t ;h4*nkrz m0s1nqs0-kW resistor at 1.0-MHz for a totalkrs* z4qn; 1ns04htmz impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series witxkp(tq o),e yf5mw01i h a 20-mF capacitor. What is the impedanceow1 ,f05px( ) yketqim at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF b)h ;ctd1zgulkx1l(2capacitor at 1.0 kHz for a total impedance of 4u1 hxtblg2k)1(zc ;d l5 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 kHz foi*80jrk)s2 /atqa h xar a phase ang2ha qst)irj 0a/k*x a8le 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 p a3x)ajnv/ j(total impedance )jnpxa/( v3jaof 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. .rli:p -0zv 8xa.u;wa*it b+ ct+ undl What is the phase xiluwu:+l* +.8vz a;- ct.i0antpbdrangle?

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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 resistor,7vov7;nd 8mj d 20-mH coil, and 1.0-mF capacitor are connected mvn78jvd7; od 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 a28g)d( e+a8aju pceu3p3y k fq 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the cigf 8u3)aad28c+e(jy ppq3 kuercuit?

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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, a jnurgz63k. d0bu4q8o5h -/inrk0c*.vkyr dvnd an inductor of inductive reactance 30 Wbc6i-zr n ok83*/q k n4v.vj0h0ry udd grk5.u 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 for a series RLC circuit containing a 50-W resistor, a 1 mi1t3fb i8e+a0-mF capacitor, and a 0.4f18b3 tmieia+5-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-v.p 9cu7o*riv *7isz ekjx72g W resistor for a phase angle ou72v ii.os7 ec9 j*vzx*p kgr7f $40^{\circ}$ 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 mhzlc64hxc,d6osb rm:eo43 xz *pj2 ;kF. At what frequency should the circuit be driven in order to have maximum powoch lx ph36,z;6s jkzdc4mob: x42 *erer 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 resistanc 0s2,snl, 1jlquqn .o 1fwizyi (b7r6de, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when t2sbo1ludys ,6f0,7nl(.qq z j w i1rinhe 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 a(nq64 mw oy yq-wid2.tn AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 d +wk07 +g0livzed(ax W and a resistance of 30 W. What is the powe d0xwdlv+7+i ag z0ek(r 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 ued5 m-w1fc4/yp x qx)i;o4fydy(kr3RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inqo)u/x1mr(fp xk ycy3dw4ye di- 45;fductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in ser sum3zl,52j,w wcj c1qies?5 m,,w3jj usz1q wlcc2

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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 resonant freqg2e79s 9cam , et.qw n0wjc+gquencyqn,t.gcwg 9sew7qc2a e0m +9 j of 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 needed in series with a 3wt; xyf6v) jnnnip 1zq,9/2 ks.7-mH inductor for a resonant frequyx,nfik/; nsw9p6v2zj n)1qtency 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 mus r*xaz4wjl d 2uq+j-4mt be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequ +-z4 ljajxm2w4d uqr*ency of the circuit is to be 1000 Hz?

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