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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 units ofg0s/ c ;higl3f/+ 320cg hvqsx ki0qoq 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 staten0o:1nt. aq/l mke ie*s 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 produceszycr3d)e.2ls ufl-o;wjia m9l 5m,7g what kind of change on tw7 r im2mdg. ; , 3zu5lac-o9)lsjyeflhe 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 t2t tmi;y k0sp,he magnetic field through a loop of wire produces what kiikm0;2s t, yptnd of 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 loh:wn0 zv9t z4mop of wire produces what kind of change on the induced n hwtzz0mv:49$emf$, 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 gkur ; 0yc-ti e5/f*xlfield 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, b v x z+ydk+lxv3*3vzze4 a15nthe direction of an induced current in a conductor will be that which tends to produce which of thdkevzv1*x4v5x3l a zy zn+3b+ e 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 horire5 4x9 4k2-f9fb/ue kxlojyr zontal table. A bar magnet is held above its center with its north pole po2x 99-frfxkoeul44 yrkb/ j5einting down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet isioh p5q e. .2zdq6a7vx held above its center with its nordeqx25a z 6o i.vqhp7.th pole pointing down, and released. As 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 tarz6g8gokw07v ble top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil ag6gkv7 0owz r8s 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 0la1.u/(t g bc.4qo ogpip4vha level table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from abov oh(0 4gg.qvlap ui/.4t1bpo ce, 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 reg ysxpt48 6o8taion where the magnetic field points straight down. The magnetic field disappears suddenly. Whp6t t8o y4x8saen viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on ah)iq3/fba/ sbi:3 s9go5oi*i 6yuelg horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one q*be i3y6s9ub ggh/ls5ia3f:/ )iooi 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 n6 qvwn +3mkohis7/zt/orth pole entering first. As the north pole enters the wire, the induced current will be (as vi/ov6qmzstw 7n/ +h3kiewed 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 c syfgb7//hfb7wq. d r8onstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points strag87fbwrdy/q fh/b. 7 sight 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 axis ;ra ok;*0mmzjiw /;tj whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the;i*0mrz;m k woajt j;/ 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. d9 mrafw x zepv1f(-7+2,gykf
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that jds*5 rwajc49 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. 9ek 7g ij/d7yqThe $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction)znk e9 g 4ce;,vcz6a)i is moved northward at constant velocity through a magnetic field that points straight down. Make a s 9)4; gzvanc6ez,ecik tatement 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 ca 0 2qjy;m1:ha q+mexionstant 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 transfcwt; u2 5dvt4b m,fwn5 *ylvdd 06pl8borms

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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. Tsy6nvyq m5ny 7yfh 1yw,.)n(s he frequency of theynyys ,f yymvhq5s.)(6w7 1n n $emf$ 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 usedgzs q 5rz.sj.k0/2eiw 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 d;:i. 3dxbcj4adtz5 hyv tm3u,evice 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 d dyad645zt4osecondary coil contains more loops than the primary coil then it odaz5td4d4y 6is 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 containspaxf ml+81pw 2 more loops than the secondary coil then it isx2+w1fpp m8l a 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 inpr b0+-tsh;zvnut

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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 circuitb eo-p2lfm 4g:,

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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 areenuq ,v:w4s t4 connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across th we4,u:nst qv4e resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an)x w gtd/,0h g)qv7zji ideal battery of constant terminal voltage. At the moment co,7)g vix)h 0gtqjzd/ wntact is 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 resistance R is connecte 8pha:x/ yf44vdrsqz4d to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is 8bn- mba-xb:g1 di*h e yk +wlhn9s7o6connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series txd)+b 5t ta7d61 zgz6hsih5 pjo a battery. The time constant for the circuit rg5ipj1ta6 zhz5t+) h7db dxs6epresents 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 tosqvsi*zgmz1( aei;;ep arr(g)qf; 6 , a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the ;m(erp6i zz;1(;sgv fq *eiagqr sa,)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 v)qk) ujb;ltcie 0/8dsame 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 topj3ney*13rkbu5 o yr+ 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 b-5jxaf l8:/(z minuw(w 7uokh7aet3to an AC power supply. In this circuit, the currenu -wjiaafnh(w7k7/ uz (85be o:3mlx tt

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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 f3l d ic;nbt(:*9.dv khq2lqi circuit changes by what factor when the frequency 9*ql f2h(qildb3k;v:i .dcnt is 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 ind;l (v mg0q;nx 2gg/yveuctor is doubled, the inductive reactance of that indxggm;vng/y; 2(eq v l0uctor

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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 approach.,wb-cay l j/ges zero, the inductive reactance of thayc/w. ,ljgb -at 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 t/q 8fwj b;kc a;*cj )5exg.wiro an AC power supply. In this circuit, the currenbaixq ;.k fwgj/8 cew *);rj5ct

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when the frequd lhmg;j r/+1w.sr.jc- anu l(ency is trip sw ljjc ha/grl-1um;nr. +.(dled?

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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 ayw.9-uk -mf jbpproaches zero, the capacitive reactance of th-jfm -w9.ubk yat capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor in a;0pz03k k qvrs RLC series circuit? 0s 3pkk0qr;zv

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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 b6ol*y7+qvgz: uxsh :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 ci25idhit,4zu w rcuit increases if R increases. Wzd5i2ihw, u 4then is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if 5qmker/ k:.tg$X_L$ 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 cir3s*2nw+hm g*rrg ,fs vcuit 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 cx j3o0/ ba9-qt frs4bnapacitance both double in an LRC series circuit, the rex9r4st0/jfq3b- anbo sonant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit thn;)ntsp(: rtufk26d/gtv 9szat is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a seried:la lox ukqw:22lfbw6) x-1a s RLC circuit 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 fieldoq gico)/(qi oj/4q/ g of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector4oc/jo (/i)oqq g gqi/ 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 unifa:yscv9a( gmf5 7(taaorm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fielaa y9 5m(7(tgf:sv aacd vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius f) p8pmz6 ylkd) s;tk.0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when theskftk.ym z)8d ;6)pp l plane of the loop 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 adjustydk/p7f 0p vn3able 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 chs1xsw: pgk ;,panges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire ;l ryf9jl:c8r on a square frame with sides 18 cm. A uniformy:;clrf lr89 j magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the 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 turn3phk6snj hpg.2k k3-ks 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 -, 2 f:*s9j7z hjgmqwt+b nszm n:hcz5area $0.20 \; m^{2}$ 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 locationw3ehpb -f/ odsu/+mt( where the downward component of the Earth's magnetic f d/ +tbumsp/h(we-o3field 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 constanw:zcige3gw .y-*m8i v- u)yes v-w3xlt angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant misw)gz.mex:-v -uy c- 8y3l*3w iw gveagnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional area q nf1x/ a19:f(f alhax v-4enjof $0.25 \; m^{2}$. 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 8trkau3jk pxu4f2i- q x,:j5lof area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on it zntxq5;)y lz-qxr tlk.8ev47s 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 to the axis of rotatio.)-q; t xlzvkxn 45 7rqlye8ztn, 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 wire u( fhwiz*n4e:+ cpmk: 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* mmtr, b*uw3r construct a simple AC generator with an output of 12 V maximum when rotat,umm tbr* *3wred 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 *e/7ojt0cmpmz *0 q7fev5abdwith a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. 0sppz d*ok9 9ubq1(6 io yafy6oiq;d6 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 opera+3d pe+ qjz 60-ykdc;iw7 jpkrtes on 120 V AC, and when rc073pz ry jp +-edj +w6;iqkkdunning at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 Wni lus(u )3*fmq1qsv*9yk/v7wcm x : f is connected to a 24-V power supply. The operating current is 1.0 A. Wha9/ xsw3li)( 7mvf:vfuy*s1*nq qcu mk t 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 resi;um3em1w21 s,hkvnmqd, q/o x stance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. ;,x km1q1wuq,hme sd/n2mo v3 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 su:1n d(j gd6ywl 5br;gupply. The operating current is 1.0 A at full speed. Wh ;u5 ng6gd :jbyr1(ldwat 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 8c j r:4i+cvkoa 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 transformer causesq6w:,fyedi.uj f62h t 14 A to flow in the secondary. How many6it fh u:,eyjw .fd62q 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 primaryeqaf q3td zh921+-oxy if the 24-V se-+f2xyth9e1z odqaq 3condary 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 primary coil and a 20 -do;t /(x1d7emq yfx msypnh*)3u3/ky+ cv mb00-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in bntd1*3p)-x k/y fhe(cq;y xsmmm 73 /ovyu+dthe 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 iqfv1p6r1.t38ho ; ecx /5 prp xhs5yayn the primary of a transformer. Assuming 100% efficiency, how many amps at8apspryo1;vft y/xc531r5eqh hp . 6x 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 provid ehjc3q9 dk u7xteg::;c /2ud7yw.awles 7500 V at 10.0 mA. The primary coil operatw7u y 3 dujg:c/ qwlc2x:.adeet;9k 7hes 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 turns on its primary coil and 300 turns or +izqy-,3ergr s u2,pd) mnp*n its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is pu p,)igd pz-ryqrrsm*en3,2+ resent 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 haoce-:enh aid )qk((tv grjc k5t4s2.7d2v b 0rs 60 turns on its primary coil and 300 turns on its secondarycqdj0e(darrt 22c) 4ie-n vvg:b kosk 7th 5.( coil. If 120 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 has 100 turns and its secondary hasvd blud t,-h2:l4v4gc 200 turns. If the input current at the primary is 100 A, we can expect the output current at the sec,-chvd4 vlb4 dl u2t:gondary 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 secem9 )csar d6iysaz b7kfq52 97ondary has 200 turns. If the input voltage to thezi r2c s9 7 amqf9kd56s7)beay 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 transfosah uk05wnir9lguo5 gx6f7 xi-d09 r *rmer has 100 turns and its secondary has 200 turns. If the k 0 galxiwrfs-*x709h5dgruo69 ui5 npower input to the primary is 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. d em5cc(pypxd5w5, t+ The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Fxe5wcpdyd,t +cpm5 (5ind 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. The voltag0paxxi8j*2uyal3xxl-46)ha ;xnd eq() srcce 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 ta *qslh(a) yx ;4ncp0cx)aur2xdl6x jei- 8x3he 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 r 01i.dk+fc,/3 t pu;7 brfgqtqc k7wqA of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of totalr qp+1 ikucf,d.btgqk0c 7rtq;wf73 / resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A ge;/de zq6wyx;q:,s-/ya vnp3weijr p *nerator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped /e;*r;xeyq-q npz3is 6/: pwwvdyj, aup 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 line 50 km long has a total / uzc8hukflmk9 vk4-6resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy f kvh8u/z4uk96mckl- 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 Vnuxdiv;b wl13id,pq4) c 9lkmk885pq. How much less power would be lost if the power were trawkb8 9kp8m4ld dxq, u13li;) vcinpq5nsmitted 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 generato o2q q;v*/ nb0ndf cx9v,fnd;ir is 440 V at 20 A. It is to be transmitted 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 2n9 ;qxbvn qi0 vdf ,do;nc/*floss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. Hou v3/,(h u e04cta(-ifhpqp bow much energy is stored in the coilqf/t p4ahh3e0( oiu,v-pcu(b 's magnetic 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 bhl9) ,c9vauo-W resistor and an 18-H inductor. What is this circuit's time constant?,clh ou)b9av9

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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 ij yck2oyh /m wc//dy:8n an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placecd;yn9aqm o9 - xsd0q.d into a 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 120sba fq 3k/ma (nyjh:6 7dmetj;3/so k--V AC outlet. What is the resistance of the lamsf3n3oms d(: 7/ba mtq;yhekj- kja6/p?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a/ zqp u).ixn3t 120-V ac power supply. What is the peak curreiqnup)xz.t3 / nt through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power s:5 :-jgb qwsvzupply. What is the power dissipated in tw5j qg- bvs::zhe 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 resistor tpf:lfhj5 1i ckv)+ kqz2 :jp3is $I = 0.80 \sin (240 t)$. 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 r9z *zobhkk7 p4esistor 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 resisto;du3lw+ ni- kq v bga+6q*r kyjlt66)kibej-.r 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.*4bs1la/ber pv+) 7,cbj ghy xi )cq/y0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1000pz xowps08l5h0*y wj9soqz/ + 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-mcyb(,y,o (5/ fq ozmiaH 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 necessik.na1nup+ :dlmy a.6ary for 157 W of inductive 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 x/ w rq2l 4q+0w.gnbln120 V AC at a frequency of 20 kHz is appliewq0 . qbn4r+x/g n2llwd 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 due to a 110-7,vhbwu s fukk*dp0nn)- :vr)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 at8fos mz4 / 5h.rw(cgpe04hjqm+l x0ux 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 capa6macu9h1oh- 5 nf pf*hcitive 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 have a reactanaxars- c:f 4fnu:au (-ce 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 capacitovz;: 4tn xr0h1ske u8ive reactance of a 0.010-mF capacitor be 100 Wn 1:o;8vx4u0zehts rk ?

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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 capaw en/er p3 lsrv.ng,3:citor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resiczm8puq o:qg85:yz1s stance, 15.0 W inductive reactance, an cmz:sz:8q 1upq5o y8gd 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mHw1 u:3urcdktmmbvi5/* gi/ e ) coil, and 1.0-mF capacito/:gkm) mveiidb* urt cw53 1/ur 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 oe7;ealyjm8*s s s)b-zk/t3ga 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conee t;abm8/gssoz3 l7)y-js* knected 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, whal(d 3-b/vv9q sl8q)nocje 3f yux 13y y)ftyw1t is the impedance at 1000vvyl/ ye1bl93)sd8(-q )cj 3yfyq3f 1on xtwu Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH iev)x;8su4 mze nductor, what is the phase ang )es8x;v4 zumele 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 series circuit with xr7l kx;86w dla 20-mH coil and 1.0-mF capacitor for a total impew;k8 x l6rlxd7dance 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 ia().hh pc1 vt;yom28i4xj-mu0 (d tiaadlst(n series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hz?2t;t( 0hl jd)atvi- (8musx4 mi1 coah.(dapy

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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 inductor at 5000 Hz fd+5 yts 7,rqnsor a tot rs+5n,s qtd7yal 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* 5gx*d;gqk9 iej- egno+e0 rtth a 100-kW resistor at 1.0-MHz for a total impedance of 150 kiegt59 e+- ogx*d j e*g0;krqnW?

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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 im 5: xpwaxrgm89:z.ygn series with a 20-mF capacitor. What is the impedance at 1000:may xg.z:xrmw9 5 p8g 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 capacitor at 9tzn mpu*e c(0w:bp.r 1.0 kHz for a total impedance of 45 W?cw. n0t9rpm* (ezu bp:

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is need2o v yrw;uxt(65c :y;q jne7rled in series with a 10-mF capacitor at 1.0 kHz for a phase angc2 ro 5;:x( u6lyyt7 v;qnjrewle 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 k*ex b ,c w/fffud2b:9bHz for a total impedance,ewb cfub2 f*/9dbx:f 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 s,zwcexp 9lc hqb:on a2dm*05h9/ yvf0eries with a 100-mF capacitor at 120 Hz. What is the phase angleabczd /o5090m29 ,yxf c:*qh vlenhwp?

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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 1f7-z wq yk)k y1y)drf9500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connk qffw97yk))zyr 1-dyected 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-W resistor, a 10.0-mF capacitor, mej tvzk) k):* pzm+x0and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circutjem)0m z +v: kkx*)pzit?

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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 3phk/koo 8qg+*4ami o3 0 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuiqo/ki3*ok+ma gh po 84t?

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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 circuif9c fm2g5excpq*qh /. t containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H in/9.e cfh*f5mqxc gpq2ductor, 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 resistor fogke:h h 7wds42.gus 1ih+z*vx r a phase angle of :7ig2xe+ k1h dsus.w4gv zhh *$40^{\circ}$ 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 = 2+:o71q*/mt j 2 d5rwd4lx6 gs mowgfja00-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transflf5o:xj7mgo w*rdad6 21g +mwq4jts/ erred 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 resistance, 15.;k7 mj6 iw6y:ch6umsd 0 W inductive reactank :mm ci6suj7 6dyw6h;ce, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC cir )utpha(fi olq+d6p8*cuit 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 resis6mj5gh5mevgdw/a-38 /4 h(ih qv p daytance of 30 W. What is the power fa 5wvq8yg5/g6jmvdpah e/ida-h43 h( mctor?

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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 foyzl) ob/ t+y:4tfu3fu r a series RLC circuit containing a 50-W resistor, a 10-mF capacu4 /) ot fytlfy:zu3+bitor, and a 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 capaclm4tloe-.np/5 zqa r(itor and a 15-mH coil in series?z4et /qp(-lo. lr5 nma

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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 a1lbx6ed6 4egx resonant frequency of 10x64xeglde1b 6 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 3.7-mH inductor for a.ozp7g +qud 8sp5iw8d resonant frequency o8zo8gdd q wi7u5sp p.+f 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in serv35br vryn qvr5 ,b62iies with a 30-W resistor and a 40-mH coil if the resonant fr5bn, rvqyb26v ri3 v5requency of the circuit is to be 1000 Hz?

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