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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 ad++d-a;g:z3y zangmke: w.qqt r-2nmwcm t67 re units 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 induttz (4*k0e o - tjbw,.hmjzmz r;.hw8sction 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 p s1c: pdv3jcc)roduces what kind of change on th )pcd:cs 3v1cje induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop oyc :*gs/gu w* t87opepf wire produces what kind of change opg* :ygwo7p 8/ t*cseun 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 9+s5 jx,hzscg u /7tafz8j.cnof a loop of wire produces what kind of change on the induced ,hgz.uszcf5xt/+ 8j 9asjn 7c$emf$, 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 o* jtfn1h;ax3 a magnetic 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 ofh k18/sb8fo:le x-hj s an induced current in a conductor will be that which tends to produce which of the following effectssxl1 h /h :ob8-jf8kes?

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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 horizont 4ibleo8:/harqn w77 val table. A bar magnet is held above its center with its north pole778r4owqhiev/l an :b 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 flat on a horizontal table. A bar magnet is held above izo h5 *j*xa.b)4 ik 4b+gauktits center with its north pole pointing down, and released. As it approaches t.hbg*4i ka)ij*xukba +45z t ohe coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region whe jf kyqr1yy :7gvz39-frv 8j*sre the magnetic field vector points straight up. The magnetic field vanishes suddyf7ryjj9r 8:yv 3v- s* fg1zkqenly. 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 top in a region where the magnetic f (9p ep2 xupjb+i*vez:w;hj 2field vector pointjx(;h*ipw +b9pfz2uv 2:jp e es straight up. The 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 ax5t j 4jzx 5l:bp 5 (zwyz1w.hvetdme.g2)jz) region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, we15:)e2z45x xj gwlzy)v dzwz j.b p5tt(.h mjhat 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 mz8.ghe2p0c, 1imrus horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. ec si8 1.,2ruh0 zpgmmWhen 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 4 xw)j tk22l;v9onwluwith the north pole entering first. As the north pole enters the wire, the induced current will be o;v9x)w2 ulwjtnl24k (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 rotate xdq+,4mos4ahppte99or2s5p d at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, wh5x t, osmadpprh2 qe49+ps4 o9at 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 as9zw9r j0 f9n(.v4( qqpjuxf sbout an axis whose diresrnq4ufp9js( 9v0 fzj xq(9w.ction 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 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.ui )qcv;e335 qyg ytoqaz,-,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 an5vfb s.pz 9;qe $emf$ 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 fz hw(lj2uxycgwu ).9nds97:;;i cgogield. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented izeb) r4s4-v+g )h38zan qv,k2pzql tjn the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement co- v4nq23k , 8gjrazl4p)b)vqehz s t+zncerning 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 0a* e, wh*pn/fou2qfya constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transfor93z7 ftfe-tob j04bk4xm3oocho i0*v ms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frequency o4kx kxd;z pt1 o64kl0mf th;4 xzk 1 6mtpodxkk0l4e $emf$ 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 devr.vchagy 9wy 7c k3ep8 54gd:pice used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device than42:/ 9t fyyo1bx mbxn0oqb r*t

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops th.6r ,;an0w rr6kgjmck an the primary coil thenwr,grkkn j0.m;ac 6r 6 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 condapgo8qmz99 ,1 fm-evtains more loops than the secondary coil thegz99-qp8dme m,fa 1 von 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 power isttg+ )j 5u;bcnput

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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 v 0b8t+fv0rnsbv( z+q o8toc; circuit,

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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 tluh5ii :( 7kx7get5d io an ideal battery of constant terminal voltage. At the moment contact is made with the batter i(ul7ei tigxk7:5h5d y, 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 connected in series to an idg/czyd ipd7qj:, 5wi9eal battery of constant terminal voltage. At the7qid:,/9g5 ziw cy dpj moment contact 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 connected t9b ool a.4q3oep(6afko 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 connecz selfmth-b-s.-/4f id 4bem7 ted 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 serie)ht6x6e 67d+i..-mxghm rc /t(qn,ubeasorf s to a battery. The time constant for the circuit represents the time .,g sh)m7ue.hie(6rfd o- tq/b6cmx+x6 rntarequired 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 battery-duj /gh6h (k/tgvg x5 is suddenly removed -/uk6gghv/j 5 gxd( htfrom 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 havewlw5hpyx/*q+(*j* m6adpbtkg z5uz6 the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuiteac ag*2s9k6 j55vai*g1arz vrfn:k;, 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 ansch4zek 5 3zku(nge(6 AC power supply. In this circuit, the currengzu3( kcn6h e4sek(z5 t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the comh;4 3m7mnv1 yxr cn yv,8g,frequency isoy7xv3,mvg hc,1rynnc 4m8 m; 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 voltaow 0i11lgdve9gn yw3:ge across an inductor is doubled, the inductive reactance of tvwn9o w 0: g3y1gdi1lehat inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor appr -;na1 8ih4-rr k.gc4htdw vn1 t-cdvaoaches zero, the inductive reactanceg i-hdvva hd1nwk4 .c--r1t;a8t4 rcn of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. kj7xpjdakp)lte2xz h8 .xr 6( 7vteaf,/9 9ik In this circuit, the currentr,l9(t 9 tjfpka7/8kxixxe jdkpz 7 )ve.a 2h6

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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 ch6j+u tblsw x;(uct0sfc7dc a9 81ejb7anges by what factor when the freque 9fulbcu s;x j1jt8767 dac0s(b+wctency is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, th: hdia8 5w2xmye capacitive reacmdi h 8yw:5x2atance of that 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 ant ia- u8k55clhd capacitor in a RLC seriei5 kt5-cha8uls circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defi jju x50f3a0ucosi) l-ned 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 increasegbvelv3*gn 4- s. When is this statemeg4-v 3 *lenvbgnt 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. 8 uw:m0qu9v(up vz5sj The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuitu.(y61 e bdrym ,y hk+o qnn)e1l5v5uz. The impedance 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 series circuit, thek)hta:1s *j4pj odcm2 resonant frequency of thatjjmc1) kh:2sa *todp4 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 is driven by an AC appl7vlpa 4 1w d:us3z4- jkddp0mcied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occura8b(d 0rss3fvn) p.pks 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.- 4 9.bqbnx0quxj*w he20 T. Find the magnetic flux through the loop when the plane oh.nx-*buqx ebw9q 40 jf the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magn-m. qlqlt. chv)7j,jjk 9utx)etic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field ve)qcxuj qm t97hk)lljj,- v ..tctor are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform m+e. lf73 oxou qh+sjg+agnetic field of 0.20 T. Find the magnetic flux through the loop whene l+xfgu +q3h.o+s o7j the 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 adjustable single loop is v / )npzu5i+lyreduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes +at4 up9g2vtu 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 withznic, ( kbym:8ha*xv6 200 turns of wire 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 uh8x6a( ybv,:i *mcnk zniformly 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 tz+4l*u*lzg he+v4ua3 s tl0vaurns 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,x:o xs.muq .*il6cyf area $0.20 \; m^{2}$ 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 -fs qhj. up2-flocation where the downward component of the Earth's magfhu jqs.-fp 2-netic 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 angular velocigq9fo m7( pp5sty of 2.0 rad/s a9p 7m(sfqgpo 5bout a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generat;6sd gk.( imhb4 /ephqlm1 jw*or 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 m7do)0gto yc wn; )m/uof 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 on its armature. Each loop it5 w72h1okkj is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum outpuio2 kkw5t71h jt 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 m.bmtgn6h:d1 *vas-s of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced 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 constrksqmpy9 -ax8ce7lf 4xi7:lt8 uct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A mag7sexl-xtl7qpf4 km i:88 y c9anetic 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 with a maximu)rd8da)--1t t iv fp( tznewm1m $emf$ 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 7dfwi6lky 32b motor have 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 6.00 W. Th (bjlm d/:hzchub8e,z97) w ile motor operates on 120 V AC, and when running at full speed it genera98hje hmb(u :dbl)z, /li7z wctes 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 rir g(/i1for 7;j pt, mtf)rk(desistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-upttiir rf/j mk17f( ;r,go )pd( 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 powerj gy mxmtby1/89 6,hwq supply. The operating current is 1 yybxmh18 mt/q6g,9jw.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 internal resizos +ap7yh 0lyosd. +3eo)wp* stance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is t do3eh0 7+op)y* yl.a owszps+he 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 needeoc2t rx4yh7 r),a,4 uk) rnxt8gg2 qmhd to reduce 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 nle8z 54ao -ssof a transformer causes 14 A to flow in the seconda n 4sls-5oae8zry. How 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 maw/j2:yrnz 7dt rub-n9ny turns are necessary in a 110-V primary if the 24-V secondtr n27n: /durjw-yzb9ary 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 2004igofaq7sf :p;5ki 9r0-turn secondary coil. If the c5gkq po f;rsa4ifi:9 7urrent 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 primary of a transformer. Assu c.* /opo;ibbtming 100% efficiency, how many amps at 24 V can fo;c/i. bt bpo*low in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. T, fkjs 36)6ly fe9biyehe primary coil operates on 120 V. What jb flye96yke) s6f, 3idoes 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 ilbb59r d) bvnm)i*7y on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the b7ivd 59i nyrbl)mb)*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 3r cuto4.;ww tfxib1d :tw9(as2k1c+o00 turns on its secondary coil. If 120 V at 2.0 A is a xkb.2ooutscrd wi:;t1 4acw9w 1+f(tpplied 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 turjxha:/h o0dezux viv b11m :oxb)(1 d5ns and its secondary has 200 turns. If the input current a115hdmvba1 v:u 0/ b):xxoe h zoijxd(t the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 8nxkjh7rc4o 1oty a1,turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we c x8kjayo 4117cnrtoh, an expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 tucvfq( nb 1w (n,tnr6t5rns and its secondary has 200 turns. If the power input to the primary is 100 W, we c t6nqf(,c1wb5(nvn rtan expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voloa5uwtjvd. ;)k8 ay 06xkq,e stage is usually stepped up to 4500 V by a transformer and trad 8u,sk.0tkaj6xyv aqeow;5 )nsmitted 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 cuk/-vl6 dqakcsr; *e 5lrrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0e; 6vkk5ll ad-rq*/c s W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually st 6jo ;no9yuko6fghp2 .epped 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 oon9.gj p 6 o;yh6fuk2voltage 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 loyoa7 n 4f p9d.d5j))yc9ujj ging has a total resistance 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. Wha pon 4g)7 9yfdijy5ujj)a.d9ct 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 .t5etghv-(s0v9sbk m50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy losssh.tkegv-5 s(9btm0 v 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 linefdrncq6a -. (k at 1000 V. How much less power would be lostf6r(kca- d n.q if the power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator yc;0 p g/va/b 7ubgxt0is 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 wxbgy0; /7tvgbpau/ 0 cith 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 A. How wq )jww)kc.xq s8jrd1jf7k )3much energy is stored in the coil's magnetic fiec fwqjwqwxk8j)1d)s)k7j .r 3ld?

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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.gtw mg:.9lhev47 b+sa0-W resistor and an 18-H inductor. What is this c4t:9sgbw e.+lahvm7g ircuit'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 an AC circuit where th ;a+l4vcskqmw+e 81-5uqcyfb e rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the u,/roa5 ,19z9ef:a il rjl cdmpeak 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 resistance of olyvrxkqd;) j.:z ; (:tp fpa7the lamp?(o; .:xkjp qtaf)r:p dvlz; y7

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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 power supply. :rv;-2k*mei qpl sx d)What is the peak current te )d:mqp*l;xk ivr2 -shrough 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 yw).y tkfg)c p s3f58spower supply. What is the power dissipated in tp5fy .fkg)wt csy 83s)he 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 isbe7qx( u0hz 34dce2w v $I = 0.80 \sin (240 t)$. 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 resi:ajeaq qv/6t mhk)df;pg1/- g;kk+pd stor 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 resicayld+movg b 6 (5;1rjstor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 60 sar3lgn 2b,+d 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 cznk0ubw(b h2 6ai p*/moil 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 g) vewr:,6ernbjj 8l*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 nere cbv8 lp31/ u; bss0 oo563uov5st6azr wr.pcessary 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 120 V AC at a frequency of vn3;)- v*hyw.d xctm(2 nstus20 kHz is aw.ndvxs ;t (v-2chu3*t)m s ynpplied 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-mcx 0m. jy 9ajnlr*t 5 jgdhq72ylm*4;lH 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 , dl b-,8e(ftxr*b hn8u:mxjp4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to havemayuukk6r,.:e r 8x9a 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 doeaztpg:h-rlk,c n z+2:tyt6d:s a 10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor b y/ -jk9nqnrp,h6 14kjw*rttze 100 Wp*zjh6 9rqt/n1knwy rk 4-tj, ?

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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 capaci5d5 zk:zbia /ftor 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 resistance, 15.0 Wnehyq ;ec vpk 40:r87o inductive reactance, yepro84nc;q0:e kh7v and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-l s*,. oppllc2mF capacitor arep,llp 2.*losc connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20. dx8ca +vzl)wqc0l)r -mH coil, and 1.0-mF capacitdcc+w0 az)xr 8)lq v.lor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what isy s85qmm+u2w(ry : qxzq. l,os the impedanc5lyo qmsmx, qu.q 8yrzs+2: w(e at 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 s- :fpy82e q1g/rgbbe geries with a 20-mH inductor, what is the phase angle ag:y/beqe-b 8g1 rfp2 gt 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 a 2 826z qoyl; e3gz5uf jm6bbug60-mH coil and 1.0-mF capacitor for a t eofu6yq;g8uzl563b2 gb6 mzjotal 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 capavw o4 z)miy5j +ofs/.vcitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at wosoj)m. f y4vv 5iz+/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 450vi a:9(-dmbl wnbe+6s-mH inductor at 5000 Hz for a total impedance of 4000d(i9 l b:n+wb-s6 evma0 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz forho+jf8s9fmb9 ,jkg dv; cwd6b4,pv ) z a total impedancep v4sfz9,jc ,b6d+ 9voj fg8dk)bm;wh of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 2krsec1 6 s.1jbk+l(h a,fst4n0-mF capacitor. What is the impedance at 1000 Hz?1ar1(s.6e tclbk,fj +s4s hnk

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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-mF2 1cfn8op eg/a capacitor at 1.0 kHz for a total im1 8ep/gf2n caopedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is neiley1m- n7pp dqd9/8b eded in series with a 10-mF capacitor at 1.0 kHz for a phasebynd d7q p81-le i9mp/ 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 resistor at 1.0 kHz for a lnfvkoq(aa.f1 9y/7v. pl w1stotal impedance ofwn /f11.vas7p akfq.y(l9lov 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is thi-a98vcg;kqx) m r2;n ff:bp he phase angle? mibg 2cfh x:f nak8qp;-v)r9;

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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 resi(wrh iy5-o,kf stor, 20-mH coil, and 1.0-mF capacitor are connected in seh5yw(- ofki,r ries?

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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 nlwxg5m*5qq( of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is th5 gx*mlnw5 q(qe 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 cawb 3uuti*gzb6dgk(+ 2pacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a b( wg3zg +ibkd*ut6u2110-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 circuitbn+v8m-jaxs v4 v0h0mg( rpltp6n*i( containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H iv+l xin6 s-(phbv g0jtv* p(rm8 0am4nnductor, 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 seriewb-dno t,0e8a 0) .vbzytj, uns with a 500-W resistor for a phase angle of n, .z0 ,n8)va ejbtyo-utwb 0d$40^{\circ}$ 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 mFfs 2-v/a syi-c. At what frequency should the circuit be driven in order to have maxii/ ys-2 cvasf-mum 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 x h/afsof7,, eseries circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected t,ehf xof7s/,ao 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 circuit xwpb 52w8zzmj;4kvu- 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 +c9ce ku3q+8chrqi5s resistance of 30 W. What is the powe 5iu+8 e skh+qrc3q9ccr 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 ciilw y6768axiyn) 0 nnqrcuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz p0ynn i66nw)l qx8ai7yower supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mHm5 ciy7mxbd5uk)bd. z7f 2n9l coil in series?9 nyu7lb 7b5mdz mxc2)ki5df.

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is nrc, f:n(9dujleeded in series with a 4.7-mF capacitor for a resonant frequ:9 jrnl(u ,cfdency 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 for a resonant fryctjr06mm l+9 d/jw/4d.cqx vequency of 1000 vm/dcj6lwt.r9 yq+ mcjx4/ 0dHz?

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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-d8 ybmt21m a,lW resistor and a 40-mH coil if the resonant f2aly bmm ,t81drequency of the circuit is to be 1000 Hz?

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