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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 u,7f/jh z zk/srnits 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 induhylqp rtnv )1yo:,0dor 7 y;2vction states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces wk1p5.q9;qjezoj .5qi w+ r chahat kind of change on the induoq phw cieajj1k;5 .+zq.5r q9ced $emf$, 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 s,l v ra,l;j(mmagnetic field through a loop of wire produces what kind of change on the inducedjlav;,(m sl,r $emf$, 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;dgxq to.lu gv264;j s kind of change on the induced jvg l;qdg ox ;6us4t.2$emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field ant:n h(uvu11yx1 bb( mu $emf$ 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 3nuq 6)ow-znccurrent in a conductor will be that which zc )no6uq3-nw tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held a1 h 57 x,up awu,zvi74xdumzvx2n uq36bove its center with its north pole pointing down. The stationary magnnu vxxz7x2 m5u u,36aqh7 p,diuw4zv 1et 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 ;4v-;g4sr frpp jtk7,eh*o ziflat on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magneeg j-i4*4oprvtz;,7; pks hfrt 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 ujh5+m )e;q dw.x qk+owhere the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induc +dh;o5xqq e)+.jwmkued 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 (--eer;h a y+ p,c d,s/lzncmd9lwb4jwhere the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the-,n;hr9 lpez b -d,w4 /jm csela+(cyd 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 magneti(vutno2 k;c1itnibu1 3 ; i9onc field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the n bi3 i;o1 cn;u9ntui1vtk (2odirection 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 ttujw ezh5b0vc /qb)+a5)m gl5able and carries an ever-increasing current northward. Two cog/v)law0ujb+)qm5 cbh55 tz e ils of wire 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 wire with the v; ) s.3dmc9wqhsvn6s o8e7iynorth pole entering first. As the north pole enters nw6m)is v3c .v79y8q;she osdthe 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 constant angu*g ,ubr hj+8d)v nbdc1lar speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight dowcb8juhd*bd1 ,+vg rn)n, 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 f :590vfyl8idzr a) ifspeed about an axis whose direction can be varied. In a region where a uniform magneti8i 0r :faf5z9 l)dyvfic 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.n5go;m v -/dq9/kbzz*kbbn9 i
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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 thrh/fbc*f w:*i f oa4bdq w)q(4at 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. T(t6io4by y.cy he $emf$ 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 thj//.yz yr;jxde east-west direction) is moved northward at constant velocity through a magnetic fiel.xj/y/yj zr ;dd 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 rotates at a b gmhauh9x(zr psg u53)3)7r zconstant 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 trr- 5d.sbg kuy-ansforms

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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 secon.d2 i 7pceg5,uutu cn cfn.)9id. The frequency of thd.i25 g) fct,p.n uiecncuu79e $emf$ 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 touo ,iji(9i,ms3b7lt4 u(q 7 3 zpnjizo

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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 tsnp:j6b03l o z4ot7ut hat

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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 u4:(2zn6oz y6k qo wiwv0u0rzcoil contains more loops than the primary coil then :zn0o0izw4w vz6ru( 2kuoy6q it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains m 1re.1v/dsn,4t9z wa ik4tjrsore loops than the secondary coil then its4.w1zkti /s,d1tre9vrn ja4 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 power int w hg50qj;u o6zqotysr 32(p,put

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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,u 5tz6cotx51v4 k;lyy;l -wag

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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 serieiye. 6ls9b.nl a*brcj kf b)a7hb:72mx 6*nbis to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across tbaf**2)b.a7 crb 6lh9mi.x: slb6jinn beyk 7he 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 ari ::zww9o6rcvt l26 fyhhz3b w7qi: 2ye connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the batv: :iythr o9 76cbi:w2wlwf26hqz3zy tery, 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 inductyj0:w 5q.zi u.2t.u 8vbelrq hance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistan;43b ikoc5dec.p d 0ubcqv3z*ce 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 conne0e84 0qu xswjzcted in series to a battery. The time constw0jeq04sz xu 8ant 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 are connected in series to a battery. The battegn(gkt5n8 oh) ry is suddenly rem (oghk)t 58gnnoved 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 excei7tz kx ngp: zi5cmmv)w2h34*/ i8mqy 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 to5*qnz 1).uiyc k5js su an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an Acr*k+c52 ,g6mdyryeg C power supply. In this circuit, the currengg ey65c+ymc k,* 2rrdt

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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 bj lzm,8gwk0 866dh iwca;yz+what factor when the frequency is tri,gz zylj6w biw0 8k +6a;8hcmdpled?

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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 n49h8wkns*azgl5v 0 lis doubled, the inductive reactance of thatsh59 wg va*n4nkzll 08 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 ac 4beysqn/x/x +icwe *2ross an inductor approaches zero, the inductive reactance of thatnqy/eb we2/c s4x +x*i 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 tlk b9f5* (u,m zj*rn lmd9zv2khis circuit, the currentukk9j*(nmz, fvlr* 5m lz 9db2

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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 cqbj :rh+kh s*i /*m kqo+s6b,aircuit changes by what factor when the frequency is tb +k +hq,*kasq m/i6b:osh*jrripled?

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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 ij2u2kvq;l.u tdy25 ma capacitor approaches zero, the capacitive reactance of that cajlk d 5 uyq2imuv;t.22pacitor

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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 inducf4mvl z *y8kxm:u0lr6*d*al ntor and capacitor in a RLC series circuix fz:8*ryml4a 06v*d ukn*llm t?

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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 Rvlfro-q 0c5x d f5d:c7o m8i;fLC circuit 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 impedance of the circuit increases if R increase5e tjp vg:hd8-(hw ,xig)y,bas. When is this statement tr8g ,w ghtb5vd-yeax:i()hj,pue?

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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 circuit llsm8zlw8 8n:t1v 0mw 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 th g ub o 8fnum*ls16j-e;gevio0/ ;ju3ne 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 the capacitance both double in an LRC series circuit, the1vny sw-3/cyz8iw9u b resonant frequency of that circuitiwn8-31 ys wcuzy /v9b will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applie9-ailida2zh k.b4 5for sx2bej:r4* dd 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 rzc.c3 5eh;fb395/ h 9u zlgp6nawrtocircuit 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 rotating in a uniform magnetic field of 0.2g i 7.b5sx(h8trjvm+y0 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vect t5mg8+isvx.r7byj h (or 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 ra 0dak3by8)seedius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find tya)ed0ks3b 8ehe magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of ravac;e0j / c7lodius 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 0 ej/ ;c7olvcaloop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced fromm0)xw3 vhe-sj $1.0 \; m^{2}$ 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 chan4n0w zaj9g u+k+zpvm8ges 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 wirz5892e xttmp ae on 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 fzae pm25 tx8t9rom 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 turns and an are du v +.bj8hpewhyu1f;r2xu*4a 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 areaqy+i5e) 0,6udl ymgk:qz pmi 3 $0.20 \; m^{2}$ 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+jv mpm;1d*eimvj ,.r span of 60 m flies horizontally at a location where the downw+ i1v.vjrjmp,*e md ;mard component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angul mh:j4 xr)/k0 jb7j8a+ekhk2ipgexq9 ar velocity of 2.0 rad/s about a vertical axis through one of its ends while in j:4pkx eh)7hbxrja ekgj89/imq 0 +k2 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 generac3gtj1, q*ljo tor has 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of nzw9p;kl1 e/hy(sv+(2uetih 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,mrve f mav355o7+jfm on its armature. 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 53m e ,aj +vmf7mro5vfto 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 th9 * gd4 dhm4sdl01k;ai dymg;urns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple Ail3h/ sph (rcgjl5r* h*4rs)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 ro(rjphg3irls*5 s/ah *4)lc rhtating 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 with a m rahp49 s4jr,h1v6 aufaximum $emf$ 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 h 2xqg 64ey p:h*hvioior2p)0ppj 35i bave a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00thc xpm0 kzq3 ;v3kewsb4a9l +6*7oxc W. The motor operates on 120 V AC, and when running at full spek*ch;ok0p cz3w7x4 a6bmv9 qs l3tex+ed 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 resistakdd:;j qo5 9jqwgph:3nce 6.0 W is connected to a 24-V power supply. The operating current is 1.0j9:53;:kdoqw jhd pgq 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 connec/reid / wm9q eavq;88qted to a 24-V power supply. The oper q/iq88 m ea;9erwd/vqating 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 internlnyd7,v2iurs.2kdk ; + xk)dk al resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. u +dd) nv il;. ,2rydsk2k7kxk 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 red8o:hxyo gw+;x uce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a tsph*k ye3: .lbransformer causes 14 A to flow in the secondary. How many turns are in the sey.sh3l *: epbkcondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, hod+qcez ahbk59cv;9sbg.2,n lqin1 :bw many turns are necessary in a 110-V primary if the 24-V secondary has 100 turns.2dl 9b;c1aqsni9z:b + nevqb5 gch,k?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and aeg9vj ojd* jj *k ghgf(,i7m(2 2000-turn secondary coil ,7dj*jghg (9o*( 2egjfmkjvi. If the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primrs;urt+ jtkh eb7:o(, jjfi.nv ;su:)ary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in t .j,r:7;is(k;j o:)nf vutue rbshj +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 at 10.0ynz2 9 ubch*:v+meu x9 mA. The p2:* zuv x ec9bhnuym9+rimary 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 6 4-vkm j1bv z*wg4be jb/0z,ws0 turns on its primary coil and 300 turns on its secondary coil. If 120 V mzkz4jv*, / g e-j1bwb4bv 0swat 2.0 A is applied to the primary, what voltage 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 prc2tqvu u6pdxw5 p )7fjsy/n1*imary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is nfd6 /yxpvtuq25cs*p )wj71u 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 seqd7kduq: fx9*condary has 200 turns. If the input current at the primary is 100 A, we can expect the outputqxf7 k:ud9qd* 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 h2 dhv7ii cn8274t zxxy7wsd4 uas 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of 7y uh dx 7in84 vc2w42xz7tisdthe 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 100y7yvtid-j.m z5-b j4rc*9b(-hqhzdn turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (negle-9 nb zh*-q5vc drh- j7bjt.4yiz dy(mcting 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 6 6yh.e- / ,nj1whfzbsfx(e(kw0 A of current at 120 V. The voltage is usually stepped up to 4500 V by a trah 6w1fy.bx ,wnf/- ezej(s(k hnsformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. Tr51o fa-e1 v-mqug cy+he voltage is usually stepped up to 4500 V by a transformer and transmitted through 1y5cr-oqmev fagu+1- a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120tq zp g lblmi2g,x3.3- 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 voltage z-mip lblx32 g3t,q.g 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 ofxbop6ua:h3yo 3 wpwl b719l*k 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 orig wxb ywuko p1h73l3:9 olap*b6inal energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance 8k ) rtr2dnqy 2ozr/dwpbw3 *;of 0.60 W. A generar to)pdw2dq/ b kzr*ywn238r;tor 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 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 dxn+v lc7 ,-kfxr ;z3lV. How much less power would be lost if the power were transmitted at 3000 V inste+z7-;x r ldcvf,x3 lnkad 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 u7l* vv1vb+ kl)uq 3bqtransmitted 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 transmissv*b)v qlk7uv1u+bq l 3ion 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 energy97 ,vco tnaa-l is stored in the coil's m oc tna,9vl-a7agnetic 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 facys0r) x 4 bvru-zk0d7w03s a 6.0-W resistor and an 18-H inductor. What is this circuit's time con4zb3s-xucyvdkr0s7r f ) w0a0stant?

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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 wheru-u,vwvzbe39 e 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 thez3i-,pix;0pu oczs j( 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 outletcg 4o4u,etu ;j. What is the resistance of the lat4;jeu ,gu co4mp?

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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 powep p4ydcd0r-linw 4ag 32c8 q0nr supply. What is the peak current through the re-08np a 4d rlcw gpcid34n20yqsistor?

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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 a4b c3-mwosqzx()(p0qfm, xv7 wrg )xsc power supply. What is the power dissip3pm0qx r,(-(o xbs) x7wmsfzqv w)4cg ated in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W rf ,t9ptkk( ,bh*mgqv5thob q+g1b6 g 3esistor 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 abk xt7iq;f m00 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 50vi +oc- s1 kq*z0 wmeoqj.buv: gokzo344 +h;y-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a3kl : 1wc+o gjdtmu*umxg) 2y+ 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 f8b*nu1 4bnm*o2hji 93khfbs;f7 w rt reactance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W o-0kd 9/2fzp qz- hyuzof 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 inductiy(2mr7tr;ac06t cuitvab - 797mgh1 cxdc0 e xve reactance 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 fr+h vqin;9dq 6 dsv3h yym-31afequency of 20 kHz is appliyv1f hm3dh + ds96ianq3 ;-qvyed to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil duj: nl5ud aa((y1mz+pc e to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor a *wmm(vl x1u2st 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 c13)e6jbud- hogb2p hmapacitive 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 10-mF capacitor hen5 xi: w4;z o3 m1rytr7ausw2ave 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 be 100 i*4q q+2tity/3tze uf W/t ti* fqz+e43t2iy uq?

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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 throun)+ie ,m.w5 vjj37 fgvlasz -j3d jm/dgh a 0.0010-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 daxlf8v i hk2hm8o2col8es(9s ku/ - +12.0 W resistance, 15.0 W induc +fc2/vhaeh( k9x 8-kso8l 8i umdols2tive 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 Hv; 2 dq,xez yhk,fjcbz86ayh/k9 :4pfz if a 100-W resistor, 20-mH coil, and 1.0-mF capacvj2:,kh,;e4z z ha/pykf ydb6 9qxcf8itor 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 H67vuxhkv:m qr.9o:y i7nd / vdz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connectedvqdmx:hvdony97 6v.7 rik: u / 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 i1smy u,s0vj3ho ( c/zski69n cnductor, what is the impedance at 1000 H n ycui3sh1,s0zmv/ 6cos(9jkz?

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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 series1/pzs k0(bhq7 s afi;j/nb5ah with a 20-mH inductor, what is the phase angle at 1000 Hz?zqk/nih7/sp a a;bhbf( s5j 10

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is need2fxw5p.6 h z wqfm1i4/rxt 4pued in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total4zpfwr4i. q2tpuxwx1 f 5h/6 m impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in seriedhk28axc i.0 os with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 iha8. xc od0k2Hz?

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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 pu * rkoalr95;xqt in series with a 450-mH inductor at 5000 Hz for a toto5lrk;9xa *rqal impedance 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 series wi;bd 1b2q0xvx.3kpq (3b m5zluz,q qx rth a 100-kW resistor at 1.0-MHz for a total impedance of 150 kW?p(53v.3b;d 1qxqxb0 mzqq rbu2 xzk,l

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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 2cpob /8n+b6k61zan c ;;:wp uhgfizb ;0-mF capacitor. What is the impedance at 1000 c+8 ab6ghz6:i;fb; opzub;w1 npcnk/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 iogi3pj( 2efhp5pm3wj6l) 0 nzn series with a 10-mF capacitor at 1.0 kHz for a total impedance of 4)gm 3l0p(3 ez6ppniwjfj2o h55 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 capp7xd7j03dk ly acitor at 1.0 kHz for a phase angle ly37k7 jdx0 dpof $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is ne5gu9wc-(p 9lq8cr qyup ry9o*eded in series with a 30-W resistor at 1.0 kHz for a total iq(r u8*pcqwy9 cp99yurg lo5-mpedance of 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 1207v80g)bgl3mam 2 gvv b Hz. What is the phase angle?lm7 g mv83gg b)vv2ba0

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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 1q8 d:sv6x7bei) txhax0 dm:w )500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF 0)dawxts heq 7xdmvbx i8):6:capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100 v75xrcl )1gl9a(rltm -W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power suppc751l9) rrg almtl xv(ly. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an induct(nlb i;m;lb t*or of inductive reactance 30 W are connected in series to a 110-ln(b il m;bt*;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 si;6m9ode8rmwcq 70x 10-mF capacitor, and a 0.45-H inductor, when connected toiewc 87qsm9 rm x6;0do 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 50k6sg+vn y stgb l, ;ui-8*l(gj0-W resistor for a phase angle ofun6j*8 g,ly sbg;-+is(vgklt $40^{\circ}$ 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 whath(4mcox7;lpa6fe+n a frequency should the circuit be dri+fh67xa ;eo p(mac l4nven in order 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 serz dv xj+s8 y d3zzf*ez6p:2ze,ies circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connecv2 zzfdjxsd,e8 +pzz63:e yz *ted 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 circuio.k :g/v0)j vs7j acnzt 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 a688ft1im, nyl1 sbtv30 W. What is 18nivm6 ,8ablf 1ytstthe 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 con* sb q fgio.ks7/4cz,ltaining a 50-W resistor, a 10-mF capacitor, and bqkgcsf ,7i*l 4./soza 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capiv +v*z ;yeyv:x*ox (hacitor and a 15-mH coil in series?yhx *yoi;+z(vex* v :v

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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 r es3f,x 54-fdmoy m1u4.7-mF capacitor for a resonant frequency of 10 kH5do,ff- 3mexy4 rum1sz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is neednm2 nk;af 1tnp,j) .hgbh ep3nrew( .)ed in series with a 3.7-mH inductor for a resonant frequency of 1000 H2egapjnbhme)1kn),nn.t .( f ; hr3pwz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor musrlnn7lw / tj0s(n):ekt be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to bl ewj n(0rnnskt7l/:) e 1000 Hz?

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