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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic fl( qqu )u*2pyawux 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 sta.zrlhp5b4 o/e si,4ibe(sg9 ,2 dmw gwtes 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 loop o/+piioe :wa+opv h,s*3v9aus of wire in a coil produces what kind of change on the oovvie /o,:h apps*wi++ a39uinduced $emf$, 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 produc .1w woj;glqm +0lc+etrcm x*3es what kind ofwg ec ql+ o+l03jc1;* m.xrwtm 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 loop of wire produces what kind of+aoa)utq-s l0*l/ c wf change on the induced sl*o)aa/ lf q+ctw0u- $emf$, 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 me6iq.ivdlnztk -f 7 j o/0qs65agnetic 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 ixjs+sq3j99h z 3ttz l(n a conductor will be that which tends to produce which of the s9 (qhst3tlzjx 39z j+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 flatze3,9z) z xssdgl( rzj+huh4/ on a horizontal table. A bar magnet is held above its lg/ju,h3ssze) zz(d+hr9x 4z center with its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies fo c 1gyrpt:; 5(y*2 azfk6igudlat 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 falliu;cty2gif az :(*prg5d6yko 1ng magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the kdam): *u6gghjf2 n 9qmagnetic field vector points straight up. The mqmkunjgh2ag 9)f6:d* agnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table tcv(qqwh08 0vz+i sm py327jerp)y.x )zqt 2p rop in a region where the magnetic field vector points straight up. T zwqv.22(7r0p)ytvhirxejzq)ps80c qmy p3+he magnetic field suddenly 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 magnetic3nrc n5gzt 7:d field points straight down. The magnetic field disappears suddenr 5cgn: n7zdt3ly. When 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 a hor)qmkup+ub7- ixc4 +b+q zkil8izontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wirc- m7+kuibbx p4qzl) q++8iuk e. 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 entering f)i3dknr 17h zhirst. As the north pole enters the wire, the induced currh3h)niz1rk d7 ent 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 constae8r6v )qv.jzj nt angular speed about an axis whose direction can be varied. In a region where a unifzj 6e r.vq)8jvorm magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angularon9 9fiqn)3jwt63a df speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what mus3o9t3qna) wf 9 fd6jnit 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.hwhw. ; 5bkdsvl6 s7fpn ;gfr9-ba4- d
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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 a gbcj4fz03e)pahd t 6.n $emf$ 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 fieldz d4w7qgw/ep 4. 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 (oriento 5 h31rhcoe( 6c9zav( +blesxed in the east-west direction) is moved northward at constant velocity through a magnetic field that points str zl+a6cboe(3x o95(1hse hrcvaight 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 conssmn3jv/m ): xptant 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 traz i4-pyzujow86pj 4+ qnsforms

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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 prb qh.ru3:/2smv nd). The frequency of the 3 n.r v:h sd/rm2qbu)p$emf$ 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 ud h(12aa 7jxgvsed 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 de7k .ii (nw:( k7xxykltvice 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 sbi- 5w5v,0qjcm ci6nsecondary coil contains more loops than the primary coil then it ibmn c -iw5iqj5vsc06, 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 con9xfqjl( wy -u i0jk:n:tains more loops than the secondary coil th (0nu 9y :jfkwxqi-j:len it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the poweo dc;ay)n8-cr(m pfwus)gp7;r 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 cg.e wu zu6x:1vircuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battq lz.s ;+ 4z:4ukw*o xq.d13l ia2pjfrkqh:iyery of constant terminal voltage. At the moment contact is made with tjk1fpr :aquq :yx;wll dhiki*sq4 zo3 4z. +.2he battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connectesocb :o1o 1u+kvu3r, hd in series to an ideal battery of constant terminal voltage. At the moment contact is made with the batter1o k3 :co,vbush or1u+y, 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 i/sdj-a. vb2o with 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 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 ir8 q (e4tq8tmss connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time consx e(7xgp6mwa5z)txr 3tant for the circuit represents the time required for the currepm x ) ea(7zrw3xg6tx5nt 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 ba.:m-;m ihlre attery is suddenly removede:lm;.-rm ai h 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 unitsv:o+*g,r ls socjo)9gt 84xaz 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 circ wa7pob8nl.t 2 c;z4zjza+g2xt3duq6uit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power sup9nn pm; ax5y:lply. In this circuit, the current5;9mnpxl:ny a

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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 7cq 7*2ts c0qetpt w*f l zh ilrg+)8d5,8tidlan ac circuit changes by what factor when the frequencpc*t t ,f sh)gtzl 2llq5887c +etiiq*dd0w 7ry 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 inductor is doubledukqde4bs5mcrx,.3pz;1wu3c ,n dl1 m , the inductive reactance of that indpzx3w5 de4 b, .lum qnu,c1s m3drk1;cuctor

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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 acp c ux8e3r)bn,ross an inductor approaches zero, the inductive reactance8u)3 r epbxnc, 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 mk1*f2u6n idi an AC power supply. In this circuit, the currei 1n6f*i mudk2nt

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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 whatjn rw.e-bx6p zn8)-j tth;e*s factor when the frequency is tripled)zt ;-sn. *wtejx6h- e8rjnbp ?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, t.yb3o c0h(m qvhe capacitive reactance of that ca0v 3 (byqmco.hpacitor

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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 ang:o lejrqxi us7 44tgo3o,-9kgle between the voltages of the inductor and capacitor in a RLC series ciro44-:uko7ejx9 ogtg rs,3li qcuit?

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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 +n9khuc2 sa*08s zm klan RLC 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 ii/ct6 tlyi 6.jf R increases. When is this statement ly6 .i6ic /tjttrue?

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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 ct*37 dn n6fba5.ytb7b; ljo +gfwri;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 im. q(6bizp oni2kz3 nb6pedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC serie3oux1 7zkx 0ay(5 snvrs circuit, the resonant frequeva xrun31yszk0(7x o5 ncy 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 that (52j)/uy) hg fu sikz0by 4trzis driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLCr rzs*su5q42w 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 macodf o3xup0g.0n r:: c58m ggzgnetic field of 0.20 T. Find the magnetic flux through the loop who ng. 5zu:00xrg3pg:ocfm8c den 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 f sb y mihmp5g,80k qnas1;tylr4p23+0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when thbyyt nks smf 13h8rlpig4+0apm; q2 5,e 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 radius 0.10 m is rotating in a uniflx:ptpg y4r sw:2wmp-, .2vgwm+wo/ l orm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the /o +:2 gpmgpw4,wp2 w-m. tlyxsrlv:wmagnetic 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 ouec.;ut-6c7fmy r;eu f an adjustable 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 coi 2sg(5n-) 2lfyughiic l changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cm.;( jwn9 uuai : np5y;kuep4v q1u93mmk A uniform magnetic field is apy;wn:uj k3ei m pku4pn 1qu;5 9(9avumplied 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 w4f1jm rv b0o;)j .fuoaith 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and a uyb77s3s u8lenok(0l7qr1.zrg 8fqgrea $0.20 \; m^{2}$ 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 w y0aftxz0y .zd k0a2kpv16*k zing span of 60 m flies horizontally at a location where the downward component of the Earth's ma1zkz0y26*0xpkyv k a. zd ft0agnetic 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 u983huo;v d5n bv)qrz constant angular velocity of 2.0 rad/s about a vertical axis through one of its en d zq9;o5v83)urhbvunds while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cros84(ho0j3 b)ha40pm6k ijv- ,a+wbxzefx u vpl s-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 ofb253xu l+69fyar;svc mxvk4y2esn (l area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. 7o0:+ketj 7cf+jfoh mEach loop is 12 cm long and : 0+7o+omke f c7jhtfj8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be 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 turb(aiz-t ,4 6y64xfefz-dvossns 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 tuk6:9 kdhh ,6(yaxbvmvi9or6 o construct a simple AC generator with an output of 12 V maximum when rotated at ov9kbh km6ravy6id, ( :6 9uxh60 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 gener ;6:s83 oz iqe(ajgzfhator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance83o )tk4g r+mpjdu3pp 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 DCe2 0me2p i ab,i3.tyun motor have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a322 iemaetpy i0nub,. 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 resistan anwkv w4g0tq3)/;*cp) bupbuce 6.0 W is connected to a 24-V power supply. The o uwwbua n*)k/ b0)qtc ;p4pgv3perating current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V pobk4 r0 +kn h1k 5zj1;8ojccxykwer supply. The operating current is 1.0 A at full speed. jkzkk y51b;1j xcck8r40n+hoWhat 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 connect1qid 3gnax(9o ed to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back a1 qn3(oi9x dg$emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltaop ac,mlr1 oaot//.;t j0l)ay ge 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 to flow.w kf2tfex/ d( in the secondary. He/ fdkfw.2x (tow many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if the 24-V se9ogfrq 5;;p- fm qs*apcondaryp;p- a;fq *mfr gsq95o 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 2000-turn secondary coiu- xidyb3,3x3ioh7 vw l. If the current in the secondary is 3.0 A, what is the curre-iuxb3 xw7vd3 ,ihy3o nt 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 prima;u4p re6e d/+mraf 5vavli;(xry of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in;r(ri/; advf4 mxl6 peve+u5a 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 75ccc+;w 46v )vb8jf vzg00 V at 10.0 mA. The primary coil operates on 120 V. What does t 6jv cfcz8v;gvw+)b4 che 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 ( ;tyssnrh5s 9/kg2zf, qauh/on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary,2gtsn/ hr(khazys ,5qfus ;/9 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 primary coil and 300 turns on dxc *z92t.mcjg*j9a1 jrn2medck+/pits secondary coil. If 120 Vmdck2 /dre * 9jjzmc j+*9gan pc2x1.t 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 has 200 tuj19filefwubd7 ;6 j7zz c+s;c rns. If the input current at the primary is 100 A, we can expect the output current at ts6 zjd;zjcw9 lf7 b+7efu1ci ;he secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turn8fzqccx qf b8t/j: ex fs ia8o;z3/84ys. If the input voltage to the primary is 100 V, we can expect the output voltage of thezo3/xf; x/8 tsey8f:ci4qcq8a 8j zbf 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 secondaryiqx);j 8 8 2iky)qsk*anaf2 wy has 200 turns. If the piiyayq a;kf 8 w8 kx))qn2*s2jower 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 r+od;/i0 3ccuj0(0 c,j vh scha cjo*xat 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total reshcxc03+c v/oh*su0ojcj;i( d r, 0ajcistance 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. The voltage is usually steppxg(t e qp+,n+gs-01qyzr+ tmsed up to 4500 V by a transformer and transmitted through a powetsqnptg++1g (+ sqemx,y0zr-r 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 120 V. j ob ,s:kqp(n m,x1kwp+u.rv )The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of v(j: 1x+ .,sqppnk)kmr,bw ou total 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 f*vwu2:k jb:v 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 w:fujv v2*k: bup 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 rq) xlrtz:: t//4 ddaeeesistance 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 ene4/q/xlrt :eez:tadd) rgy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less po5 vtn.7b2)f le+dux biwer would be lost if the power were transmitted at 3000 + ufn2d).btl 7xi5ve bV 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 genere+rffwv (h* +zator 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*vh zre++fwf( a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 rne0rleg b89 5A. How much energy is stored in the coil's magnetic fieldr0enlr8 59be g?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor a4z g,(kl/o.car6p ouo nd an 18-H inductor. What is this ci grzlu(6 o/k op,ca.4orcuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in bi(vji. 2wck 4an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What63cck ts 2,gn*u weadk/x.gp h),qy2q is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the rb4mdj 1 xx:g op bh22u+ia--xjesistance of the lamp1-xa jo+2du x4pmx-ib g2 hj:b?

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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 aeqv3f) bw7n(c vx7s( y/ca4q o 120-V ac power supply. What is the peak current throq74f cwbave3 /s)(7noy x qvc(ugh 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 powerk1pq/9os:j zk supply. What is the power dissipated/pjkqz9ks1 :o 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 resis 632o oo7ch:vkf f ph/glsu+d1tor 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 azi 9dq6 dt/qi* 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-Wc3k v kjz1l /hhpc1s-ybu -;4d 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 a 1.0-mH indumdp/uj (1b v1t; odpi)ctor 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 coiz4gn u(cnismd5 -) xl v0.;ecol 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 havag ;gui- 1q2ftm;,ezo e 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance gu rvv a .xvh3*lqwln, .d0-/xat 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 induct udo+ ;1kzm:mp/elba)zfdi8*or when 120 V AC at a frequency of 20 kHz is applied toz8)lpaobimfz+ :ddu/m; 1ke * 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 thr /1v +nsiy1pgkough a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capac vimxt4+ jkq8vzc+ b26itor 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 t/ym;dyq - o0/ u,ld s51tolemro 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 10-mFk k4tgkz/m(gpxv (n:a tr g 5 2/anoil4*jy)v9 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 c9vtg nx gp15vpv)l,s;apacitive reactance of a 0.010-mF capacitor be 100 Wvtpp 1;l5 ,vng9gxsv )?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 5xml0s0n. fg) u.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 1g0rcvc .)*c 6vf6qhkg 5.0 W inductive reactance, and 10.0 W capacitive reactaqvc)g6.fcr cvh 6k* 0gnce?

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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 imp9mnt 3a08kr u vfr; 6wq7zmmt5edance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected itu5w rn0m3f 8v9zrammtq;7 6kn 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 ang)r7fe smrwekdh:x /4,le at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriehe m,ex7rkf s)dwr /4:s?

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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-mHddds vi02ad9/ inductor, what is the impedance atddda 02vi ds/9 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, whhem .kd62fs c.at is the phase angle at k.df26ecm.s h1000 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 4tk9brq 6b* y4;j wjgta 20-mH coil and 1.0-mF capacitor for a total impedantyb *tb4j;w9 qkj 6gr4ce of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resistst1swob *o 0ll,(xbt o) nad8(or and 15-m(s o8bls)*n0 ao,wo tldt1x(bH coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 50008eim ql:gcjf/;d bp,*ilt l ;4on/ dc3 Hz for a total iqllbl4dp;e / i; cc,o8i/g*mft3n jd:mpedance 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 in5g:1z/oj 2ylqond2jkw .:hrp series with a 100-kW resistor at 1.0-MHz for a total impedance of g:1nz2p:kojr d y/wj oq2h.5l150 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 connect/v8 r3,rc polsed in series with a 20-mF capacitor. What is the impedance at 1000 Hz/r ps lcrov83,?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a1/ana2(xv:fbvgj/.:ba z erf total impedance ofj12ba b .f(/avfr/ xgeanv z:: 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is neegxvmez2vk2zzp eww *y/83p+2 ded in series with a 10-mF capacitor at 1.0 kHz for a phaszg2vp8wyk*x e /w2mpzz3e2v+e angle 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 resiv tmiep* ql-82aad 7h.gx1u/sstor at 1.0 kHz for a total impedance of 45 7 2i1*pmxgqhtvld e-u/.asa8 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:dvti.z rwmb)( * lorbk1 --/ ukmzz1j capacitor at 120 Hz. What is the phase anzzik-.m-1 )wt( 1bro*z rv/blmkdu :j gle?

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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 re.:y i.iqkn ari4qj9+e sistor, 20-mH coil, and 1.0i jk4i rni+. y.q9aq:e-mF 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 kkf;rtf9k8cf7ivh;4 a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rh4ki f;kc vtf8r9f; 7kms 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 reafp 9p p+f(1u*icefu5jtam4e; vi4b 3yctance 30 W, and an inductor of inductive reactance 30 W are connected in seriesi*pp;teu494mp +bcyai j3v f51(ufef 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 coic g2eoqb8* t7zuxttop ex5h201j, 2gntaining a 50-W resistor, a 10-mF capacitoxbgutto1 h28j q*g0zeo5 7p2c t,ixe2r, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase angle099 vh6em0i k letasy) 6ns2tj ofnm0j t9s6a0kv6e ies yt2)9hl $40^{\circ}$ 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.l ,he,.5 :ty xw/k 93uqam9ldt i9kwaw0 W, L = 200-mH, C = 10.0 mF. At what frequency should th9 ,/awltt d:39k5a xwuk.9 ym i,qlhewe circuit be driven 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 series circuit w5m q6dqa wmxl5s 6n8z.ith 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V sq 5 w zx.85aqmmn6dl6power 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 angleom i6k9kora1(4 yczi69z-4iei t 3 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 W and a qh,;; gjo u1grresistance of 30 W. What is the power fg;qg ;r,u1 hojactor?

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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 s,db+1f f9zzr2 qu b6zRLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor,zu9f zd1,b2f s6 br+zq 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 capacitoo./ bk y o ln*fdq38ez,ebo9r1r and a 15-mH coil in series?b b/, 8kndo yeloof.1r3 ze*9q

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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-mFzd;),s1vl de u capacitor for a resonant frequencyul ,)esz;vd1 d 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 3.7-mH inductor for5+x;n+ etdkkshmb*0o a resonant freque*bk;ko+ e 0nmst xdh5+ncy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and aiu6vkza.w y(3p+tfg i jk2y(p2/1 v ag 40-mH coil if the rw 1( ta2avi3fy62gky ijp+ (vkgzpu./esonant frequency of the circuit is to be 1000 Hz?

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